IEC 60034-12:2016
(Main)Rotating electrical machines - Part 12: Starting performance of single-speed three-phase cage induction motors
Rotating electrical machines - Part 12: Starting performance of single-speed three-phase cage induction motors
IEC 60034-12:2016 specifies the parameters for eight designs of starting performance of single-speed three-phase 50 Hz or 60 Hz cage induction motors in accordance with IEC 60034-1 that:
- have a rated voltage up to 1 000 V;
- are intended for direct-on-line or star-delta starting;
- are rated on the basis of duty type S1;
- are constructed to any degree of protection and explosion protection. The main changes with respect to the previous edition are as follows:
- new design letter E for extended efficiency motors, explanation of all design letters, and description of new designs NE, NEY, HE, and HEY;
- addition of a reference to IEC 60079-7;
- addition of a formula to calculate locked rotor current from apparent power.
Machines électriques tournantes - Partie 12: Caractéristiques de démarrage des moteurs triphasés à induction à cage à une seule vitesse
L'IEC 60034-12:2016 spécifie les paramètres de huit conceptions de caractéristiques de démarrage de moteurs triphasés à induction à cage monovitesse fonctionnant à 50 Hz ou 60 Hz conformes à l'IEC 60034-1 qui:
- ont des tensions assignées jusqu'à 1 000 V;
- sont prévus pour démarrage direct ou étoile-triangle;
- sont dimensionnés pour le service type S1;
- peuvent avoir n'importe quel degré de protection incluant les protections contre les explosions. Les modifications techniques majeures par rapport à l'édition précédente sont les suivantes:
- nouvelle lettre de conception E pour les moteurs de rendement amélioré, explication de toutes les lettres de conception, et description des nouvelles conceptions NE, NEY, HE, et HEY;
- ajout d'une référence à l'IEC 60079-7;
- ajout d'une formule pour calculer le courant à rotor bloqué à partir de la puissance apparente.
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IEC 60034-12 ®
Edition 3.0 2016-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Rotating electrical machines –
Part 12: Starting performance of single-speed three-phase cage induction
motors
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IEC 60034-12 ®
Edition 3.0 2016-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Rotating electrical machines –
Part 12: Starting performance of single-speed three-phase cage induction
motors
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.160.01 ISBN 978-2-8322-3652-9
− 2 − IEC 60034-12:2016 RLV IEC 2016
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Symbols . 7
5 Designation . 7
5.1 General . 7
5.2 Design N . 7
5.3 Design NE . 7
5.4 Designs NY and NEY . 7
5.5 Design H . 8
5.6 Design HE . 8
5.7 Designs HY and HEY . 8
6 Design N requirements . 8
6.1 Torque characteristics . 8
6.2 Locked rotor current and apparent power . 8
6.3 Starting requirements . 9
7 Design NY NE starting requirements. 9
8 Designs NY and NEY starting requirements . 9
9 Design H requirements . 9
9.1 Starting torque . 9
9.2 Locked rotor current and apparent power . 9
9.3 Starting requirements . 9
10 Design HY HE starting requirements. 10
11 Designs HY and HEY starting requirements . 10
Table 1 – Minimum values of torques for design N . 10
Table 2 – Maximum values of locked rotor apparent power for designs N and H . 11
Table 3 – Maximum values of locked rotor apparent power for designs NE and HE . 11
Table 4 – External moment of inertia (J) . 12
Table 5 – Minimum values of torques for design H . 13
Table 6 – Maximum values of locked rotor apparent power for motors with type of
protection 'e' .
Table 6 – Minimum values of torques for design N-e motors with type of protection
'-e Ex eb – increased safety' . 14
Table 7 – External moment of inertia (J) for motors with type of protection ‘e’ 'Ex eb –
increased safety' . 15
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –
Part 12: Starting performance of single-speed
three-phase cage induction motors
FOREWORD
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− 4 − IEC 60034-12:2016 RLV IEC 2016
International Standard IEC 60034-12 has been prepared by IEC technical committee 2:
Rotating machinery.
This third edition cancels and replaces the second edition, published in 2002, and its
amendment 1, published in 2007. It constitutes a technical revision.
The main technical changes with regard to the previous edition are as follows:
Clause or
Change
subclause
1 Part of note 3 moved to the regular text
3 Definition of locked rotor current and of rated voltage added
5 New design letter E for extended efficiency motors, explanation of all design letters, and
description of new designs NE, NEY, HE, and HEY
6.2 and 9.2 Limits for locked rotor apparent power for E(Ex)e motors replaced by a reference to IEC 60079-7
Formula added to calculate locked rotor current from apparent power
7 and 10 Definition of new limits for locked rotor apparent power for extended efficiency motors (new table
3)
Tables Tables 1 and 4 to 7 extended down to P = 120 W
N
Name of type of protection updated according to IEC 60079-7 Ed. 5
The text of this standard is based on the following documents:
CDV Report on voting
2/1789/CDV 2/1821A/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 60034 series, published under the general title Rotating electrical
machines, can be found on the IEC website.
NOTE A table of cross-references of all IEC TC 2 publications can be found in the IEC TC 2 dashboard on the
IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The “colour inside” logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this publication using a colour printer.
ROTATING ELECTRICAL MACHINES –
Part 12: Starting performance of single-speed
three-phase cage induction motors
1 Scope
This part of IEC 60034 specifies the parameters for four eight designs of starting performance
of single-speed three-phase 50 Hz or 60 Hz cage induction motors in accordance with
IEC 60034-1 that:
– have a rated voltage up to 1 000 V;
– are intended for direct-on-line or star-delta starting;
– are rated on the basis of duty type S1;
– are constructed to any degree of protection and explosion protection.
This document also applies to dual voltage motors provided that the flux saturation level is the
same for both voltages and to motors having type of protection 'e – increased safety' with
temperature classes T1 to T3 complying with IEC 60079-0 and IEC 60079-7.
The values of torque, apparent power and current given in this document are limiting values
(that is, minimum or maximum without tolerance).
NOTE 1 It is not expected that all manufacturers will produce machines for all four eight designs. The selection of
any specific design in accordance with this document will be a matter of agreement between the manufacturer and
the purchaser.
NOTE 2 Designs other than the four eight specified may be necessary for particular applications.
NOTE 3 It should be noted that values given in manufacturers' catalogues may include tolerances in accordance
with IEC 60034-1.
NOTE 4 The values tabled for locked rotor apparent power are based on r.m.s. symmetrical steady state locked
rotor currents; at motor switch on there will be a one-half cycle asymmetrical instantaneous peak current which
may range from 1,8 to 2,8 times the steady state locked rotor value. The current peak and decay time are a
function of the motor design and switching angle.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60034-1, Rotating electrical machines – Part 1: Rating and performance
IEC 60034-30-1, Rotating electrical machines – Part 30-1: Efficiency classes of line-operated
AC motors (IE-code)
IEC 60079-0, Electrical apparatus for explosive gas atmospheres – Part 0: General requirements
IEC 60079-7:2015, Electrical apparatus for Explosive gas atmospheres – Part 7: Equipment
protection by increased safety "e"
− 6 − IEC 60034-12:2016 RLV IEC 2016
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
rated torque
T
N
torque the motor develops at its shaft end at rated output and speed
[SOURCE: IEC 60050-411:1996, 411-48-05]
3.2
locked-rotor torque
T
l
smallest measured torque the motor develops at its shaft end with the rotor locked, over all its
angular positions, at rated voltage and frequency
[SOURCE: IEC 60050-411:1996, 411-48-06]
3.3
pull-up torque
T
u
smallest steady-state asynchronous torque which the motor develops between zero speed
and the speed which corresponds to the breakdown torque, when the motor is supplied at the
rated voltage and frequency
Note 1 to entry: This definition does not apply to those motors whose torque continually decreases with increase
in speed.
Note 2 to entry: In addition to the steady-state asynchronous torques, harmonic synchronous torques, which are a
function of rotor load angle, will be present at specific speeds. At such speeds, the accelerating torque may be
negative for some rotor load angles. Experience and calculation show this to be an unstable operating condition
and therefore harmonic synchronous torques do not prevent motor acceleration and are excluded from this
definition.
3.4
breakdown torque
T
b
maximum steady-state asynchronous torque which the motor develops without an abrupt drop
in speed, when the motor is supplied at the rated voltage and frequency
Note 1 to entry: This definition does not apply to those motors whose torque continually decreases with increase
in speed.
3.5
rated output
P
N
value of the output included in the rating
3.6
rated voltage
U
N
value of the voltage included in the rating
3.7
locked rotor apparent power
S
l
apparent power input with the motor held at rest at rated voltage and frequency
3.8
locked rotor current
I
l
steady state current with the motor held at rest at rated voltage and frequency
4 Symbols
Symbol Quantity
J
External moment of inertia
p Number of pole pairs
P Rated output
N
S Locked rotor apparent power
l
T Rated torque
N
T Locked rotor torque
l
T Pull-up torque
u
T Breakdown torque
b
5 Designation
5.1 General
Motors designed according to this document are classified according to 5.2 to 5.7. The letters
used to specify the different designs stand for:
N: normal starting torque
H: high starting torque
Y: star-delta starting
E: motors utilizing extended / higher locked rotor apparent power and current to achieve a
higher efficiency class according to IEC 60034-30-1
5.2 Design N
Normal starting torque three-phase cage induction motors, intended for direct-on-line starting,
having 2, 4, 6 or 8 poles, rated from 0,4 0,12 kW to 1 600 kW.
5.3 Design NE
Normal starting torque three-phase cage induction motors having higher locked rotor apparent
power than design N, intended for direct-on-line starting, having 2, 4, 6 or 8 poles, rated from
0,12 kW to 1 600 kW.
5.4 Designs NY and NEY
Motors similar to designs N or NE, respectively, but intended for star-delta starting. For these
motors in star-connection, minimum values for T and T are 25 % of the values of design N or
l u
NE, respectively, see Table 1.
− 8 − IEC 60034-12:2016 RLV IEC 2016
5.5 Design H
High starting torque three-phase cage induction motors with 4, 6 or 8 poles, intended for
direct-online starting, rated from 0,4 0,12 kW to 160 kW at a frequency of 60 Hz.
5.6 Design HE
High starting torque three-phase cage induction motors having higher locked rotor apparent
power than design H, with 4, 6 or 8 poles, intended for direct-online starting, rated from
0,12 kW to 160 kW at a frequency of 60 Hz.
5.7 Designs HY and HEY
Motors similar to designs H or HE, respectively, but intended for star-delta starting. For these
motors in star-connection, minimum values for T and T are 25 % of the values of design H or
l u
HE, respectively, see Table 5.
6 Design N requirements
6.1 Torque characteristics
The starting torque is represented by three characteristic features. These features shall be in
accordance with the appropriate values given in Table 1 or Table 6. The values in Table 1 and
Table 6 are minimum values at rated voltage. Higher values are allowed.
The motor torque at any speed between zero and that at which breakdown torque occurs shall
be not less than 1,3 times the torque obtained from a curve varying as the square of the
speed and being equal to rated torque at rated speed. However, for 2-pole motors with type of
protection ' e Ex eb – increased safety' having a rated output greater than 100 kW, the motor
torque at any speed between zero and that at which breakdown torque occurs shall not be
less than 1,3 times the torque obtained from a curve varying as the square of the speed and
being equal to 70 % rated torque at rated speed. For motors with type of protection ' e Ex eb',
the three characteristic torques shall be in accordance with the appropriate values given in
Table 6.
NOTE The factor 1,3 has been chosen with regard to an undervoltage of 10 % in relation to the rated voltage at
the motor terminals during the acceleration period.
6.2 Locked rotor current and apparent power
The locked rotor apparent power shall be not greater than the appropriate value given in
Table 2 or table 6. The values given in Table 2 and table 6 are independent of the number of
poles and are maximum values at rated voltage. For motors with type of protection 'e', locked
rotor apparent power shall be in accordance with the appropriate values given in table 6
specified in IEC 60079-7.
The locked rotor current is calculated from the locked rotor apparent power according to:
S P
l N
I = ×
l
P
3U
N
N
NOTE The advantage of specifying S /P instead of I /I is that the locked rotor current can be calculated from
l N l N
rated power and rated voltage only, not requiring to know the rated current which depends on quantities such as
power factor and efficiency that are usually not known in early stages of a project.
6.3 Starting requirements
Motors shall be capable of withstanding two starts in succession (coasting to rest between
starts) from cold conditions and one start from hot after running at rated conditions. The
retarding torque due to the driven load will be in each case proportional to the square of the
speed and equal to the rated torque at rated speed with the external moment of inertia given
in Table 4 or Table 7.
In each case, a further start is permissible only if the motor temperature before starting does
not exceed the steady temperature at rated load. However, for 2-pole motors with type of
protection 'e Ex eb – increased safety' having a rated output greater than 100 kW, the
retarding torque due to the driven load is proportional to the square of the speed and equal to
70 % rated torque at rated speed, with the external moment of inertia given in Table 7. After
this starting, load with rated torque is possible.
NOTE It should be recognized that the number of starts should be minimized since these affect the life of the
motor.
7 Design NY NE starting requirements
The starting requirements are as for design N, except that the limits for locked rotor apparent
power in Table 3 apply, as increasing efficiency values require physically increasing values
for locked rotor apparent power.
8 Designs NY and NEY starting requirements
The starting requirements are as for designs N or NE, respectively. In addition, however, a
reduced retarding torque is necessary as the starting torque in ‘star connection’ may be
insufficient to accelerate some loads to an acceptable speed.
NOTE It should be recognized that the number of starts should be minimized since these affect the life of the
motor.
9 Design H requirements
9.1 Starting torque
The starting torque is represented by three characteristic features. These features shall be in
accordance with the appropriate values given in Table 5. These values are minimum values at
rated voltage. Higher values are allowed.
9.2 Locked rotor current and apparent power
The locked rotor apparent power shall be not greater than the appropriate value given in
Table 2. The values in Table 2 are independent of the number of poles and are maximum
values at rated voltage.
The locked rotor current is calculated from the locked rotor apparent power according to the
formula given in 6.2.
9.3 Starting requirements
Motors shall be capable of withstanding two starts in succession (coasting to rest between
starts) from cold conditions, and one start from hot after running at rated conditions. The
retarding torque due to the driven load is assumed to be constant and equal to rated torque,
independent of speed, with an external moment of inertia of 50 % of the values given in
Table 4.
− 10 − IEC 60034-12:2016 RLV IEC 2016
In each case, a further start is permissible only if the motor temperature before starting does
not exceed the steady temperature at rated load.
NOTE It should be recognized that the number of starts should be minimized since these affect the life of the
motor.
10 Design HY HE starting requirements
The starting requirements are as for design H, except that the limits for locked rotor apparent
power in Table 3 apply, as increasing efficiency values require physically increasing values
for locked rotor apparent power.
11 Designs HY and HEY starting requirements
The starting requirements are as for design H or HE, respectively. In addition, however, a
reduced retarding torque is necessary as the starting torque in ‘star connection’ may be
insufficient to accelerate some loads to an acceptable speed.
NOTE It should be recognized that the number of starts should be minimized since these affect the life of the
motor.
Table 1 – Minimum values of torques for design N
Range of rated Number of poles
output
2 4 6 8
kW
T T T T T T T T T T T T
l u b l u b l u b l u b
1,9 1,3 2,0 2,0 1,4 2,0 1,7 1,2 1,7 1,5 1,1 1,6
0,4 0,12 ≤ P ≤ 0,63
N
1,8 1,2 2,0 1,9 1,3 2,0 1,7 1,2 1,8 1,5 1,1 1,7
0,63 < P ≤ 1,0
N
1,0 < P ≤ 1,6 1,8 1,2 2,0 1,9 1,3 2,0 1,6 1,1 1,9 1,4 1,0 1,8
N
1,6 < P ≤ 2,5 1,7 1,1 2,0 1,8 1,2 2,0 1,6 1,1 1,9 1,4 1,0 1,8
N
1,6 1,1 2,0 1,7 1,2 2,0 1,5 1,1 1,9 1,3 1,0 1,8
2,5 < P ≤ 4,0
N
4,0 < P ≤ 6,3 1,5 1,0 2,0 1,6 1,1 2,0 1,5 1,1 1,9 1,3 1,0 1,8
N
6,3 < P ≤ 10 1,5 1,0 2,0 1,6 1,1 2,0 1,5 1,1 1,8 1,3 1,0 1,7
N
1,4 1,0 2,0 1,5 1,1 2,0 1,4 1,0 1,8 1,2 0,9 1,7
10 < P ≤ 16
N
1,3 0,9 1,9 1,4 1,0 1,9 1,4 1,0 1,8 1,2 0,9 1,7
16 < P ≤ 25
N
25 < P ≤ 40 1,2 0,9 1,9 1,3 1,0 1,9 1,3 1,0 1,8 1,2 0,9 1,7
N
40 < P ≤ 63 1,1 0,8 1,8 1,2 0,9 1,8 1,2 0,9 1,7 1,1 0,8 1,7
N
1,0 0,7 1,8 1,1 0,8 1,8 1,1 0,8 1,7 1,0 0,7 1,6
63 < P ≤ 100
N
100 < P ≤ 160 0,9 0,7 1,7 1,0 0,8 1,7 1,0 0,8 1,7 0,9 0,7 1,6
N
160 < P ≤ 250 0,8 0,6 1,7 0,9 0,7 1,7 0,9 0,7 1,6 0,9 0,7 1,6
N
0,75 0,6 1,6 0,75 0,6 1,6 0,75 0,6 1,6 0,75 0,6 1,6
250 < P ≤ 400
N
0,65 0,5 1,6 0,65 0,5 1,6 0,65 0,5 1,6 0,65 0,5 1,6
400 < P ≤ 630
N
630 < P ≤ 1 600 0,5 0,3 1,6 0,5 0,3 1,6 0,5 0,3 1,6 0,5 0,3 1,6
N
NOTE The values given are per unit T .
N
Table 2 – Maximum values of locked rotor apparent power
for designs N and H
Range of rated output
S /P
l N
kW
P ≤ 0,4 22
N
0,4 ≤ P ≤ 6,3 13
N
0,4 < P ≤ 0,63 19
N
0,63 < P ≤ 1,0
N
1,0 < P ≤ 1,8 15
N
1,8 < P ≤ 4,0 14
N
4,0 < P ≤ 6,3 13
N
6,3 < P ≤ 25
N
25 < P ≤ 63 11
N
63 < P ≤ 630 10
N
630 < P ≤ 1 600
N
NOTE S is expressed as a per unit value of PN (kVA/kW).
l
Table 3 – Maximum values of locked rotor apparent power for designs NE and HE
Range of rated output
S /P
l N
kW
P ≤ 0,4 22
N
0,4 < P ≤ 0,63 19
N
0,63 < P ≤ 1,0 17
N
1,0 < P ≤ 6,3 15
N
6,3 < P ≤ 25
N
25 < P ≤ 63 13
N
63 < P ≤ 630
N
630 < P ≤ 1 600
N
− 12 − IEC 60034-12:2016 RLV IEC 2016
Table 4 – External moment of inertia (J)
Number of poles 2 4 6 8
Frequency 50 60 50 60 50 60 50 60
Hz
Rated output Moment of inertia
kW kg m
0,12 0,006 0,004 0,034 0,025 0,092 0,069 0,190 0,142
0,25 0,011 0,009 0,065 0,049 0,179 0,134 0,368 0,276
0,4 0,018 0,014 0,099 0,074 0,273 0,205 0,561 0,421
0,63 0,026 0,020 0,149 0,112 0,411 0,308 0,845 0,634
1,0 0,040 0,030 0,226 0,170 0,624 0,468 1,28 0,960
1,6 0,061 0,046 0,345 0,259 0,952 0,714 1,95 1,46
2,5 0,091 0,068 0,516 0,387 1,42 1,07 2,92 2,19
4,0 0,139 0,104 0,788 0,591 2,17 1,63 4,46 3,34
6,3 0,210 0,158 1,19 0,889 3,27 2,45 6,71 5,03
10 0,318 0,239 1,80 1,35 4,95 3,71 10,2 7,63
16 0,485 0,364 2,74 2,06 7,56 5,67 15,5 11,6
25 0,725 0,544 4,10 3,07 11,3 8,47 23,2 17,4
40 1,11 0,830 6,26 4,69 17,2 12,9 35,4 26,6
63 1,67 1,25 9,42 7,06 26,0 19,5 53,3 40,0
100 2,52 1,89 14,3 10,7 39,3 29,5 80,8 60,6
160 3,85 2,89 21,8 16,3 60,1 45,1 123 92,5
250 5,76 4,32 32,6 24,4 89,7 67,3 184 138
400 8,79 6,59 49,7 37,3 137 103 281 211
630 13,2 9,90 74,8 56,1 206 155 423 317
1 600 30,6 23 173 130 477 358 979 734
NOTE 1 The values of the moment of inertia given are in terms of mr where m is the mass and r is the mean
radius of gyration.
NOTE 2 Moment of inertia is defined in ISO 31/3 1992, Number 3-7 80000-4:2006, Number 4-7.
NOTE 3 For intermediate and higher values, external moments of inertia shall be calculated according to the
following formula from which the values in the table have been calculated:
0,9 2,5
– for 50 Hz motors J = 0,04P p
0,9 2,5
– for 60 Hz motors J = 0,03P p
where: J is the external moment of inertia in kg m ;
P is the output in kW;
p is the number of pairs of poles.
Table 5 – Minimum values of torques for design H
Number of poles
Range of rated output
4 6 8
kW
T T T T T T T T T
l u b l u b l u b
0,4 0,12 ≤ P ≤ 0,63 3,0 2,1 2,1 2,55 1,8 1,9 2,25 1,65 1,9
N
2,85 1,95 2,0 2,55 1,8 1,9 2,25 1,65 1,9
0,63 < P ≤ 1,0
N
2,85 1,95 2,0 2,4 1,65 1,9 2,1 1,5 1,9
1,0 < P ≤ 1,6
N
1,6 < P ≤ 2,5 2,7 1,8 2,0 2,4 1,65 1,9 2,1 1,5 1,9
N
2,55 1,8 2,0 2,25 1,65 1,9 2,0 1,5 1,9
2,5 < P ≤ 4,0
N
2,4 1,65 2,0 2,25 1,65 1,9 2,0 1,5 1,9
4,0 < P ≤ 6,3
N
6,3 < P ≤ 10 2,4 1,65 2,0 2,25 1,65 1,9 2,0 1,5 1,9
N
10 < P ≤ 16 2,25 1,65 2,0 2,1 1,5 1,9 2,0 1,4 1,9
N
2,1 1,5 1,9 2,1 1,5 1,9 2,0 1,4 1,9
16 < P ≤ 25
N
25 < P ≤ 40 2,0 1,5 1,9 2,0 1,5 1,9 2,0 1,4 1,9
N
40 < P ≤ 160 2,0 1,4 1,9 2,0 1,4 1,9 2,0 1,4 1,9
N
NOTE 1 The values given are per unit T .
N
NOTE 2 The values of T are 1,5 times the corresponding values for design N, but are not less than 2,0.
l
NOTE 3 The values of T are 1,5 times the corresponding values for design N, but are not less than 1,4.
u
NOTE 4 The values of T are equal to the corresponding values for design N, but are not less than 1,9 and the
b
values of T .
u
− 14 − IEC 60034-12:2016 RLV IEC 2016
Table 6 – Minimum values of torques for design N-e motors with type of protection
' e Ex eb – increased safety'
Number of poles
Range of
rated output 2 4 6 8
kW
T T T T T T T T T T T T
l u b l u b l u b l u b
1,7 1,1 1,8 1,8 1,2 1,8 1,5 1,1 1,6 1,4 1,0 1,6
0,4 0,12 ≤ P ≤ 0,63
N
0,63 < P ≤ 1,0 1,6 1,1 1,8 1,7 1,2 1,8 1,5 1,1 1,6 1,4 1,0 1,6
N
1,6 1,1 1,8 1,7 1,2 1,8 1,4 1,0 1,7 1,3 1,0 1,6
1,0 < P ≤ 1,6
N
1,5 1,0 1,8 1,6 1,1 1,8 1,4 1,0 1,7 1,3 1,0 1,6
1,6 < P ≤ 2,5
N
2,5 < P ≤ 4,0 1,4 1,0 1,8 1,5 1,1 1,8 1,4 1,0 1,7 1,2 0,9 1,6
N
4,0 < P ≤ 6,3 1,4 1,0 1,8 1,4 1,0 1,8 1,4 1,0 1,7 1,2 0,9 1,6
N
1,4 1,0 1,8 1,4 1,0 1,8 1,4 1,0 1,6 1,2 0,9 1,6
6,3 < P ≤ 10
N
1,3 0,9 1,8 1,4 1,0 1,8 1,3 1,0 1,6 1,1 0,8 1,6
10 < P ≤ 16
N
16 < P ≤ 25 1,2 0,9 1,7 1,3 1,0 1,7 1,3 1,0 1,6 1,1 0,8 1,6
N
1,1 0,8 1,7 1,2 0,9 1,7 1,2 0,9 1,6 1,1 0,8 1,6
25 < P ≤ 40
N
1,0 0,7 1,6 1,1 0,8 1,6 1,1 0,8 1,6 1,0 0,7 1,6
40 < P ≤ 63
N
63 < P ≤ 100 0,9 0,65 1,6 1,0 0,8 1,6 1,0 0,8 1,6 0,9 0,7 1,6
N
100 < P ≤ 160 0,8 0,6 1,6 0,9 0,7 1,6 0,9 0,7 1,6 0,8 0,6 1,6
N
0,75 0,55 1,6 0,8 0,6 1,6 0,8 0,6 1,6 0,8 0,6 1,6
160 < P ≤ 250
N
250 < P ≤ 400 0,7 0,55 1,6 0,7 0,55 1,6 0,7 0,55 1,6 0,7 0,55 1,6
N
400 < P ≤ 630 0,6 0,45 1,6 0,6 0,45 1,6 0,6 0,4 1,6 0,6 0,4 1,6
N
NOTE The values given are per unit T .
N
Table 6 – Maximum values of locked rotor apparent power
for motors with type of protection 'e'
Range of rated output
S
I
kW
0,4 ≤ P ≤ 6,3
N
6,3 < P ≤ 63 11
N
63 < P ≤ 630
N
NOTE S is expressed as a per unit value
l
of P (kVA/kW).
N
Table 7 – External moment of inertia (J) for motors with type of protection 'e'
'Ex eb – increased safety'
Number of poles 2 4 6 8
Frequency 50 60 50 60 50 60 50 60
Hz
Rated output Moment of inertia
kW kg m
0,12 0,006 0,005 0,037 0,027 0,101 0,076 0,207 0,155
0,25 0,012 0,009 0,066 0,050 0,183 0,137 0,375 0,281
0,4 0,017 0,013 0,097 0,073 0,267 0,200 0,548 0,411
0,63 0,025 0,019 0,140 0,105 0,386 0,289 0,792 0,594
1,0 0,036 0,027 0,204 0,153 0,561 0,421 1,15 0,864
1,6 0,053 0,040 0,298 0,223 0,821 0,616 1,69 1,26
2,5 0,076 0,057 0,428 0,321 1,18 0,884 2,42 1,81
4,0 0,110 0,083 0,626 0,469 1,72 1,29 3,54 2,66
6,3 0,160 0,120 0,904 0,678 2,49 1,87 5,12 3,84
10 0,232 0,174 1,31 0,986 3,62 2,72 7,44 5,58
16 0,340 0,255 1,92 1,44 5,30 3,98 10,9 8,16
25 0,488 0,366 2,76 2,07 7,61 5,71 15,6 11,7
40 0,714 0,536 4,04 3,03 11,1 8,35 22,9 17,1
63 1,03 0,774 5,84 4,38 16,1 12,1 33,0 24,8
100 1,50 1,13 8,49 6,37 23,4 17,5 48,0 36,0
160 2,20 1,65 12,4 9,32 34,2 25,7 70,3 52,7
250 3,15 2,36 17,8 13,4 49,1 36,9 101,0 75,7
400 4,61 3,46 26,1 19,6 71,9 53,9 148 111
630 6,66 5,00 37,7 28,3 104 77,9 213 160
NOTE 1 The values of the moment of inertia given are in terms of mr where m is the mass and r is the mean
radius of gyration.
NOTE 2 Moment of inertia is defined in ISO 31/3 1992, Number 3-7 80000-4:2006, Number 4-7.
NOTE 3 For intermediate and higher values, external moments of inertia shall be calculated according to the
following formula from which the values in the table have been calculated:
0,81 2,5
– for 50 Hz motors J = 0,036P p
0,81 2,5
– for 60 Hz motors J = 0,027P p
where: J is the external moment of inertia in kg m ;
P is the output in kW;
p is the number of pairs of poles.
___________
IEC 60034-12 ®
Edition 3.0 2016-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Rotating electrical machines –
Part 12: Starting performance of single-speed three-phase cage induction
motors
Machines électriques tournantes –
Partie 12: Caractéristiques de démarrage des moteurs triphasés à induction à
cage à une seule vitesse
− 2 − IEC 60034-12:2016 IEC 2016
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Symbols . 7
5 Designation . 7
5.1 General . 7
5.2 Design N . 7
5.3 Design NE . 7
5.4 Designs NY and NEY . 7
5.5 Design H . 7
5.6 Design HE . 8
5.7 Designs HY and HEY . 8
6 Design N requirements . 8
6.1 Torque characteristics . 8
6.2 Locked rotor current and apparent power . 8
6.3 Starting requirements . 8
7 Design NE starting requirements . 9
8 Designs NY and NEY starting requirements . 9
9 Design H requirements . 9
9.1 Starting torque . 9
9.2 Locked rotor current and apparent power . 9
9.3 Starting requirements . 9
10 Design HE starting requirements . 10
11 Designs HY and HEY starting requirements . 10
Table 1 – Minimum values of torques for design N . 10
Table 2 – Maximum values of locked rotor apparent power for designs N and H . 11
Table 3 – Maximum values of locked rotor apparent power for designs NE and HE . 11
Table 4 – External moment of inertia (J) . 12
Table 5 – Minimum values of torques for design H . 13
Table 6 – Minimum values of torques for design N motors with type of protection 'Ex
eb – increased safety' . 13
Table 7 – External moment of inertia (J) for motors with type of protection 'Ex eb –
increased safety' . 14
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –
Part 12: Starting performance of single-speed
three-phase cage induction motors
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
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consensus of opinion on the relevant subjects since each technical committee has representation from all
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misinterpretation by any end user.
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
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indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60034-12 has been prepared by IEC technical committee 2:
Rotating machinery.
This third edition cancels and replaces the second edition, published
...
IEC 60034-12 ®
Edition 3.0 2016-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Rotating electrical machines –
Part 12: Starting performance of single-speed three-phase cage induction
motors
Machines électriques tournantes –
Partie 12: Caractéristiques de démarrage des moteurs triphasés à induction à
cage à une seule vitesse
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IEC 60034-12 ®
Edition 3.0 2016-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Rotating electrical machines –
Part 12: Starting performance of single-speed three-phase cage induction
motors
Machines électriques tournantes –
Partie 12: Caractéristiques de démarrage des moteurs triphasés à induction à
cage à une seule vitesse
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.160.01 ISBN 978-2-8322-3768-7
− 2 − IEC 60034-12:2016 IEC 2016
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Symbols . 7
5 Designation . 7
5.1 General . 7
5.2 Design N . 7
5.3 Design NE . 7
5.4 Designs NY and NEY . 7
5.5 Design H . 7
5.6 Design HE . 8
5.7 Designs HY and HEY . 8
6 Design N requirements . 8
6.1 Torque characteristics . 8
6.2 Locked rotor current and apparent power . 8
6.3 Starting requirements . 8
7 Design NE starting requirements . 9
8 Designs NY and NEY starting requirements . 9
9 Design H requirements . 9
9.1 Starting torque . 9
9.2 Locked rotor current and apparent power . 9
9.3 Starting requirements . 9
10 Design HE starting requirements . 10
11 Designs HY and HEY starting requirements . 10
Table 1 – Minimum values of torques for design N . 10
Table 2 – Maximum values of locked rotor apparent power for designs N and H . 11
Table 3 – Maximum values of locked rotor apparent power for designs NE and HE . 11
Table 4 – External moment of inertia (J) . 12
Table 5 – Minimum values of torques for design H . 13
Table 6 – Minimum values of torques for design N motors with type of protection 'Ex
eb – increased safety' . 13
Table 7 – External moment of inertia (J) for motors with type of protection 'Ex eb –
increased safety' . 14
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –
Part 12: Starting performance of single-speed
three-phase cage induction motors
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60034-12 has been prepared by IEC technical committee 2:
Rotating machinery.
This third edition cancels and replaces the second edition, published in 2002, and its
amendment 1, published in 2007. It constitutes a technical revision.
− 4 − IEC 60034-12:2016 IEC 2016
The main technical changes with regard to the previous edition are as follows:
Clause or
Change
subclause
1 Part of note 3 moved to the regular text
3 Definition of locked rotor current and of rated voltage added
5 New design letter E for extended efficiency motors, explanation of all design letters, and
description of new designs NE, NEY, HE, and HEY
6.2 and 9.2 Limits for locked rotor apparent power for E(Ex)e motors replaced by a reference to IEC 60079-7
Formula added to calculate locked rotor current from apparent power
7 and 10 Definition of new limits for locked rotor apparent power for extended efficiency motors (new table
3)
Tables Tables 1 and 4 to 7 extended down to P = 120 W
N
Name of type of protection updated according to IEC 60079-7 Ed. 5
The text of this standard is based on the following documents:
CDV Report on voting
2/1789/CDV 2/1821A/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 60034 series, published under the general title Rotating electrical
machines, can be found on the IEC website.
NOTE A table of cross-references of all IEC TC 2 publications can be found in the IEC TC 2 dashboard on the
IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
ROTATING ELECTRICAL MACHINES –
Part 12: Starting performance of single-speed
three-phase cage induction motors
1 Scope
This part of IEC 60034 specifies the parameters for eight designs of starting performance of
single-speed three-phase 50 Hz or 60 Hz cage induction motors in accordance with
IEC 60034-1 that:
– have a rated voltage up to 1 000 V;
– are intended for direct-on-line or star-delta starting;
– are rated on the basis of duty type S1;
– are constructed to any degree of protection and explosion protection.
This document also applies to dual voltage motors provided that the flux saturation level is the
same for both voltages.
The values of torque, apparent power and current given in this document are limiting values
(that is, minimum or maximum without tolerance).
NOTE 1 It is not expected that all manufacturers will produce machines for all eight designs. The selection of any
specific design in accordance with this document will be a matter of agreement between the manufacturer and the
purchaser.
NOTE 2 Designs other than the eight specified may be necessary for particular applications.
NOTE 3 It should be noted that values given in manufacturers' catalogues may include tolerances in accordance
with IEC 60034-1.
NOTE 4 The values tabled for locked rotor apparent power are based on r.m.s. symmetrical steady state locked
rotor currents; at motor switch on there will be a one-half cycle asymmetrical instantaneous peak current which
may range from 1,8 to 2,8 times the steady state locked rotor value. The current peak and decay time are a
function of the motor design and switching angle.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60034-30-1, Rotating electrical machines – Part 30-1: Efficiency classes of line-operated
AC motors (IE-code)
IEC 60079-7:2015, Explosive atmospheres – Part 7: Equipment protection by increased safety
"e"
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
− 6 − IEC 60034-12:2016 IEC 2016
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
rated torque
T
N
torque the motor develops at its shaft end at rated output and speed
[SOURCE: IEC 60050-411:1996, 411-48-05]
3.2
locked-rotor torque
T
l
smallest measured torque the motor develops at its shaft end with the rotor locked, over all its
angular positions, at rated voltage and frequency
[SOURCE: IEC 60050-411:1996, 411-48-06]
3.3
pull-up torque
T
u
smallest steady-state asynchronous torque which the motor develops between zero speed
and the speed which corresponds to the breakdown torque, when the motor is supplied at the
rated voltage and frequency
Note 1 to entry: This definition does not apply to those motors whose torque continually decreases with increase
in speed.
Note 2 to entry: In addition to the steady-state asynchronous torques, harmonic synchronous torques, which are a
function of rotor load angle, will be present at specific speeds. At such speeds, the accelerating torque may be
negative for some rotor load angles. Experience and calculation show this to be an unstable operating condition
and therefore harmonic synchronous torques do not prevent motor acceleration and are excluded from this
definition.
3.4
breakdown torque
T
b
maximum steady-state asynchronous torque which the motor develops without an abrupt drop
in speed, when the motor is supplied at the rated voltage and frequency
Note 1 to entry: This definition does not apply to those motors whose torque continually decreases with increase
in speed.
3.5
rated output
P
N
value of the output included in the rating
3.6
rated voltage
U
N
value of the voltage included in the rating
3.7
locked rotor apparent power
S
l
apparent power input with the motor held at rest at rated voltage and frequency
3.8
locked rotor current
I
l
steady state current with the motor held at rest at rated voltage and frequency
4 Symbols
Symbol Quantity
J
External moment of inertia
p Number of pole pairs
P Rated output
N
S Locked rotor apparent power
l
T Rated torque
N
T Locked rotor torque
l
T Pull-up torque
u
T Breakdown torque
b
5 Designation
5.1 General
Motors designed according to this document are classified according to 5.2 to 5.7. The letters
used to specify the different designs stand for:
N: normal starting torque
H: high starting torque
Y: star-delta starting
E: motors utilizing extended / higher locked rotor apparent power and current to achieve a
higher efficiency class according to IEC 60034-30-1
5.2 Design N
Normal starting torque three-phase cage induction motors, intended for direct-on-line starting,
having 2, 4, 6 or 8 poles, rated from 0,12 kW to 1 600 kW.
5.3 Design NE
Normal starting torque three-phase cage induction motors having higher locked rotor apparent
power than design N, intended for direct-on-line starting, having 2, 4, 6 or 8 poles, rated from
0,12 kW to 1 600 kW.
5.4 Designs NY and NEY
Motors similar to designs N or NE, respectively, but intended for star-delta starting. For these
motors in star-connection, minimum values for T and T are 25 % of the values of design N or
l u
NE, respectively, see Table 1.
5.5 Design H
High starting torque three-phase cage induction motors with 4, 6 or 8 poles, intended for
direct-online starting, rated from 0,12 kW to 160 kW at a frequency of 60 Hz.
− 8 − IEC 60034-12:2016 IEC 2016
5.6 Design HE
High starting torque three-phase cage induction motors having higher locked rotor apparent
power than design H, with 4, 6 or 8 poles, intended for direct-online starting, rated from
0,12 kW to 160 kW at a frequency of 60 Hz.
5.7 Designs HY and HEY
Motors similar to designs H or HE, respectively, but intended for star-delta starting. For these
motors in star-connection, minimum values for T and T are 25 % of the values of design H or
l u
HE, respectively, see Table 5.
6 Design N requirements
6.1 Torque characteristics
The starting torque is represented by three characteristic features. These features shall be in
accordance with the appropriate values given in Table 1 or Table 6. The values in Table 1 and
Table 6 are minimum values at rated voltage. Higher values are allowed.
The motor torque at any speed between zero and that at which breakdown torque occurs shall
be not less than 1,3 times the torque obtained from a curve varying as the square of the
speed and being equal to rated torque at rated speed. However, for 2-pole motors with type of
protection 'Ex eb – increased safety' having a rated output greater than 100 kW, the motor
torque at any speed between zero and that at which breakdown torque occurs shall not be
less than 1,3 times the torque obtained from a curve varying as the square of the speed and
being equal to 70 % rated torque at rated speed. For motors with type of protection 'Ex eb',
the three characteristic torques shall be in accordance with the appropriate values given in
Table 6.
NOTE The factor 1,3 has been chosen with regard to an undervoltage of 10 % in relation to the rated voltage at
the motor terminals during the acceleration period.
6.2 Locked rotor current and apparent power
The locked rotor apparent power shall be not greater than the appropriate value given in
Table 2. The values given in Table 2 are independent of the number of poles and are
maximum values at rated voltage. For motors with type of protection 'e', locked rotor apparent
power shall be in accordance with the appropriate values specified in IEC 60079-7.
The locked rotor current is calculated from the locked rotor apparent power according to:
S P
l N
I = ×
l
P
3U
N
N
NOTE The advantage of specifying S /P instead of I /I is that the locked rotor current can be calculated from
l N l N
rated power and rated voltage only, not requiring to know the rated current which depends on quantities such as
power factor and efficiency that are usually not known in early stages of a project.
6.3 Starting requirements
Motors shall be capable of withstanding two starts in succession (coasting to rest between
starts) from cold conditions and one start from hot after running at rated conditions. The
retarding torque due to the driven load will be in each case proportional to the square of the
speed and equal to the rated torque at rated speed with the external moment of inertia given
in Table 4 or Table 7.
In each case, a further start is permissible only if the motor temperature before starting does
not exceed the steady temperature at rated load. However, for 2-pole motors with type of
protection 'Ex eb – increased safety' having a rated output greater than 100 kW, the retarding
torque due to the driven load is proportional to the square of the speed and equal to 70 %
rated torque at rated speed, with the external moment of inertia given in Table 7. After this
starting, load with rated torque is possible.
NOTE It should be recognized that the number of starts should be minimized since these affect the life of the
motor.
7 Design NE starting requirements
The starting requirements are as for design N, except that the limits for locked rotor apparent
power in Table 3 apply, as increasing efficiency values require physically increasing values
for locked rotor apparent power.
8 Designs NY and NEY starting requirements
The starting requirements are as for designs N or NE, respectively. In addition, however, a
reduced retarding torque is necessary as the starting torque in ‘star connection’ may be
insufficient to accelerate some loads to an acceptable speed.
NOTE It should be recognized that the number of starts should be minimized since these affect the life of the
motor.
9 Design H requirements
9.1 Starting torque
The starting torque is represented by three characteristic features. These features shall be in
accordance with the appropriate values given in Table 5. These values are minimum values at
rated voltage. Higher values are allowed.
9.2 Locked rotor current and apparent power
The locked rotor apparent power shall be not greater than the appropriate value given in
Table 2. The values in Table 2 are independent of the number of poles and are maximum
values at rated voltage.
The locked rotor current is calculated from the locked rotor apparent power according to the
formula given in 6.2.
9.3 Starting requirements
Motors shall be capable of withstanding two starts in succession (coasting to rest between
starts) from cold conditions, and one start from hot after running at rated conditions. The
retarding torque due to the driven load is assumed to be constant and equal to rated torque,
independent of speed, with an external moment of inertia of 50 % of the values given in
Table 4.
In each case, a further start is permissible only if the motor temperature before starting does
not exceed the steady temperature at rated load.
NOTE It should be recognized that the number of starts should be minimized since these affect the life of the
motor.
− 10 − IEC 60034-12:2016 IEC 2016
10 Design HE starting requirements
The starting requirements are as for design H, except that the limits for locked rotor apparent
power in Table 3 apply, as increasing efficiency values require physically increasing values
for locked rotor apparent power.
11 Designs HY and HEY starting requirements
The starting requirements are as for design H or HE, respectively. In addition, however, a
reduced retarding torque is necessary as the starting torque in ‘star connection’ may be
insufficient to accelerate some loads to an acceptable speed.
NOTE It should be recognized that the number of starts should be minimized since these affect the life of the
motor.
Table 1 – Minimum values of torques for design N
Range of rated Number of poles
output
2 4 6 8
kW
T T T T T T T T T T T T
l u b l u b l u b l u b
0,12 ≤ P ≤ 0,63 1,9 1,3 2,0 2,0 1,4 2,0 1,7 1,2 1,7 1,5 1,1 1,6
N
0,63 < P ≤ 1,0 1,8 1,2 2,0 1,9 1,3 2,0 1,7 1,2 1,8 1,5 1,1 1,7
N
1,8 1,2 2,0 1,9 1,3 2,0 1,6 1,1 1,9 1,4 1,0 1,8
1,0 < P ≤ 1,6
N
1,7 1,1 2,0 1,8 1,2 2,0 1,6 1,1 1,9 1,4 1,0 1,8
1,6 < P ≤ 2,5
N
2,5 < P ≤ 4,0 1,6 1,1 2,0 1,7 1,2 2,0 1,5 1,1 1,9 1,3 1,0 1,8
N
1,5 1,0 2,0 1,6 1,1 2,0 1,5 1,1 1,9 1,3 1,0 1,8
4,0 < P ≤ 6,3
N
1,5 1,0 2,0 1,6 1,1 2,0 1,5 1,1 1,8 1,3 1,0 1,7
6,3 < P ≤ 10
N
10 < P ≤ 16 1,4 1,0 2,0 1,5 1,1 2,0 1,4 1,0 1,8 1,2 0,9 1,7
N
16 < P ≤ 25 1,3 0,9 1,9 1,4 1,0 1,9 1,4 1,0 1,8 1,2 0,9 1,7
N
1,2 0,9 1,9 1,3 1,0 1,9 1,3 1,0 1,8 1,2 0,9 1,7
25 < P ≤ 40
N
40 < P ≤ 63 1,1 0,8 1,8 1,2 0,9 1,8 1,2 0,9 1,7 1,1 0,8 1,7
N
63 < P ≤ 100 1,0 0,7 1,8 1,1 0,8 1,8 1,1 0,8 1,7 1,0 0,7 1,6
N
0,9 0,7 1,7 1,0 0,8 1,7 1,0 0,8 1,7 0,9 0,7 1,6
100 < P ≤ 160
N
0,8 0,6 1,7 0,9 0,7 1,7 0,9 0,7 1,6 0,9 0,7 1,6
160 < P ≤ 250
N
250 < P ≤ 400 0,75 0,6 1,6 0,75 0,6 1,6 0,75 0,6 1,6 0,75 0,6 1,6
N
0,65 0,5 1,6 0,65 0,5 1,6 0,65 0,5 1,6 0,65 0,5 1,6
400 < P ≤ 630
N
0,5 0,3 1,6 0,5 0,3 1,6 0,5 0,3 1,6 0,5 0,3 1,6
630 < P ≤ 1 600
N
NOTE The values given are per unit T .
N
Table 2 – Maximum values of locked rotor apparent power
for designs N and H
Range of rated output
S /P
l N
kW
P ≤ 0,4 22
N
0,4 < P ≤ 0,63 19
N
0,63 < P ≤ 1,0 17
N
1,0 < P ≤ 1,8
N
1,8 < P ≤ 4,0 14
N
4,0 < P ≤ 6,3 13
N
6,3 < P ≤ 25 12
N
25 < P ≤ 63
N
63 < P ≤ 630 10
N
630 < P ≤ 1 600 9
N
Table 3 – Maximum values of locked rotor apparent power for designs NE and HE
Range of rated output
S /P
l N
kW
P ≤ 0,4 22
N
0,4 < P ≤ 0,63 19
N
0,63 < P ≤ 1,0 17
N
1,0 < P ≤ 6,3
N
6,3 < P ≤ 25 14
N
25 < P ≤ 63 13
N
63 < P ≤ 630
N
630 < P ≤ 1 600
N
− 12 − IEC 60034-12:2016 IEC 2016
Table 4 – External moment of inertia (J)
Number of poles 2 4 6 8
Frequency 50 60 50 60 50 60 50 60
Hz
Rated output Moment of inertia
kW kg m
0,12 0,006 0,004 0,034 0,025 0,092 0,069 0,190 0,142
0,25 0,011 0,009 0,065 0,049 0,179 0,134 0,368 0,276
0,4 0,018 0,014 0,099 0,074 0,273 0,205 0,561 0,421
0,63 0,026 0,020 0,149 0,112 0,411 0,308 0,845 0,634
1,0 0,040 0,030 0,226 0,170 0,624 0,468 1,28 0,960
1,6 0,061 0,046 0,345 0,259 0,952 0,714 1,95 1,46
2,5 0,091 0,068 0,516 0,387 1,42 1,07 2,92 2,19
4,0 0,139 0,104 0,788 0,591 2,17 1,63 4,46 3,34
6,3 0,210 0,158 1,19 0,889 3,27 2,45 6,71 5,03
10 0,318 0,239 1,80 1,35 4,95 3,71 10,2 7,63
16 0,485 0,364 2,74 2,06 7,56 5,67 15,5 11,6
25 0,725 0,544 4,10 3,07 11,3 8,47 23,2 17,4
40 1,11 0,830 6,26 4,69 17,2 12,9 35,4 26,6
63 1,67 1,25 9,42 7,06 26,0 19,5 53,3 40,0
100 2,52 1,89 14,3 10,7 39,3 29,5 80,8 60,6
160 3,85 2,89 21,8 16,3 60,1 45,1 123 92,5
250 5,76 4,32 32,6 24,4 89,7 67,3 184 138
400 8,79 6,59 49,7 37,3 137 103 281 211
630 13,2 9,90 74,8 56,1 206 155 423 317
1 600 30,6 23 173 130 477 358 979 734
NOTE 1 The values of the moment of inertia given are in terms of mr where m is the mass and r is the mean
radius of gyration.
NOTE 2 Moment of inertia is defined in ISO 80000-4:2006, Number 4-7.
NOTE 3 For intermediate and higher values, external moments of inertia shall be calculated according to the
following formula from which the values in the table have been calculated:
0,9 2,5
– for 50 Hz motors J = 0,04P p
0,9 2,5
– for 60 Hz motors J = 0,03P p
where: J is the external moment of inertia in kg m ;
P is the output in kW;
p is the number of pairs of poles.
Table 5 – Minimum values of torques for design H
Number of poles
Range of rated output
4 6 8
kW
T T T T T T T T T
l u b l u b l u b
0,12 ≤ P ≤ 0,63 3,0 2,1 2,1 2,55 1,8 1,9 2,25 1,65 1,9
N
2,85 1,95 2,0 2,55 1,8 1,9 2,25 1,65 1,9
0,63 < P ≤ 1,0
N
2,85 1,95 2,0 2,4 1,65 1,9 2,1 1,5 1,9
1,0 < P ≤ 1,6
N
1,6 < P ≤ 2,5 2,7 1,8 2,0 2,4 1,65 1,9 2,1 1,5 1,9
N
2,55 1,8 2,0 2,25 1,65 1,9 2,0 1,5 1,9
2,5 < P ≤ 4,0
N
2,4 1,65 2,0 2,25 1,65 1,9 2,0 1,5 1,9
4,0 < P ≤ 6,3
N
6,3 < P ≤ 10 2,4 1,65 2,0 2,25 1,65 1,9 2,0 1,5 1,9
N
10 < P ≤ 16 2,25 1,65 2,0 2,1 1,5 1,9 2,0 1,4 1,9
N
2,1 1,5 1,9 2,1 1,5 1,9 2,0 1,4 1,9
16 < P ≤ 25
N
25 < P ≤ 40 2,0 1,5 1,9 2,0 1,5 1,9 2,0 1,4 1,9
N
40 < P ≤ 160 2,0 1,4 1,9 2,0 1,4 1,9 2,0 1,4 1,9
N
NOTE 1 The values given are per unit T .
N
NOTE 2 The values of T are 1,5 times the corresponding values for design N, but are not less than 2,0.
l
NOTE 3 The values of T are 1,5 times the corresponding values for design N, but are not less than 1,4.
u
NOTE 4 The values of T are equal to the corresponding values for design N, but are not less than 1,9 and the
b
values of T .
u
Table 6 – Minimum values of torques for design N motors with type of protection
'Ex eb – increased safety'
Number of poles
Range of
rated output 2 4 6 8
kW
T T T T T T T T T T T T
l u b l u b l u b l u b
0,12 ≤ P ≤ 0,63 1,7 1,1 1,8 1,8 1,2 1,8 1,5 1,1 1,6 1,4 1,0 1,6
N
0,63 < P ≤ 1,0 1,6 1,1 1,8 1,7 1,2 1,8 1,5 1,1 1,6 1,4 1,0 1,6
N
1,6 1,1 1,8 1,7 1,2 1,8 1,4 1,0 1,7 1,3 1,0 1,6
1,0 < P ≤ 1,6
N
1,6 < P ≤ 2,5 1,5 1,0 1,8 1,6 1,1 1,8 1,4 1,0 1,7 1,3 1,0 1,6
N
2,5 < P ≤ 4,0 1,4 1,0 1,8 1,5 1,1 1,8 1,4 1,0 1,7 1,2 0,9 1,6
N
1,4 1,0 1,8 1,4 1,0 1,8 1,4 1,0 1,7 1,2 0,9 1,6
4,0 < P ≤ 6,3
N
1,4 1,0 1,8 1,4 1,0 1,8 1,4 1,0 1,6 1,2 0,9 1,6
6,3 < P ≤ 10
N
10 < P ≤ 16 1,3 0,9 1,8 1,4 1,0 1,8 1,3 1,0 1,6 1,1 0,8 1,6
N
1,2 0,9 1,7 1,3 1,0 1,7 1,3 1,0 1,6 1,1 0,8 1,6
16 < P ≤ 25
N
1,1 0,8 1,7 1,2 0,9 1,7 1,2 0,9 1,6 1,1 0,8 1,6
25 < P ≤ 40
N
40 < P ≤ 63 1,0 0,7 1,6 1,1 0,8 1,6 1,1 0,8 1,6 1,0 0,7 1,6
N
63 < P ≤ 100 0,9 0,65 1,6 1,0 0,8 1,6 1,0 0,8 1,6 0,9 0,7 1,6
N
0,8 0,6 1,6 0,9 0,7 1,6 0,9 0,7 1,6 0,8 0,6 1,6
100 < P ≤ 160
N
0,75 0,55 1,6 0,8 0,6 1,6 0,8 0,6 1,6 0,8 0,6 1,6
160 < P ≤ 250
N
250 < P ≤ 400 0,7 0,55 1,6 0,7 0,55 1,6 0,7 0,55 1,6 0,7 0,55 1,6
N
0,6 0,45 1,6 0,6 0,45 1,6 0,6 0,4 1,6 0,6 0,4 1,6
400 < P ≤ 630
N
NOTE The values given are per unit T .
N
− 14 − IEC 60034-12:2016 IEC 2016
Table 7 – External moment of inertia (J) for motors with type of protection
'Ex eb – increased safety'
Number of poles 2 4 6 8
Frequency 50 60 50 60 50 60 50 60
Hz
Rated output Moment of inertia
kW kg m
0,12 0,006 0,005 0,037 0,027 0,101 0,076 0,207 0,155
0,25 0,012 0,009 0,066 0,050 0,183 0,137 0,375 0,281
0,4 0,017 0,013 0,097 0,073 0,267 0,200 0,548 0,411
0,63 0,025 0,019 0,140 0,105 0,386 0,289 0,792 0,594
1,0 0,036 0,027 0,204 0,153 0,561 0,421 1,15 0,864
1,6 0,053 0,040 0,298 0,223 0,821 0,616 1,69 1,26
2,5 0,076 0,057 0,428 0,321 1,18 0,884 2,42 1,81
4,0 0,110 0,083 0,626 0,469 1,72 1,29 3,54 2,66
6,3 0,160 0,120 0,904 0,678 2,49 1,87 5,12 3,84
10 0,232 0,174 1,31 0,986 3,62 2,72 7,44 5,58
16 0,340 0,255 1,92 1,44 5,30 3,98 10,9 8,16
25 0,488 0,366 2,76 2,07 7,61 5,71 15,6 11,7
40 0,714 0,536 4,04 3,03 11,1 8,35 22,9 17,1
63 1,03 0,774 5,84 4,38 16,1 12,1 33,0 24,8
100 1,50 1,13 8,49 6,37 23,4 17,5 48,0 36,0
160 2,20 1,65 12,4 9,32 34,2 25,7 70,3 52,7
250 3,15 2,36 17,8 13,4 49,1 36,9 101,0 75,7
400 4,61 3,46 26,1 19,6 71,9 53,9 148 111
630 6,66 5,00 37,7 28,3 104 77,9 213 160
NOTE 1 The values of the moment of inertia given are in terms of mr where m is the mass and r is the mean
radius of gyration.
NOTE 2 Moment of inertia is defined in ISO 80000-4:2006, Number 4-7.
NOTE 3 For intermediate and higher values, external moments of inertia shall be calculated according to the
following formula from which the values in the table have been calculated:
0,81 2,5
– for 50 Hz motors J = 0,036P p
0,81 2,5
– for 60 Hz motors J = 0,027P p
;
where: J is the external moment of inertia in kg m
P is the output in kW;
p is the number of pairs of poles.
___________
− 16 − IEC 60034-12:2016 IEC 2016
SOMMAIRE
AVANT-PROPOS . 17
1 Domaine d'application . 19
2 Références normatives . 19
3 Termes et définitions . 19
4 Symboles . 21
5 Désignation . 21
5.1 Généralités . 21
5.2 Moteurs de conception N . 21
5.3 Moteurs de conception NE . 21
5.4 Moteurs de conception NY et NEY . 21
5.5 Moteurs de conception H . 22
5.6 Moteurs de conception HE . 22
5.7 Moteurs de conception HY et HEY . 22
6 Exigences pour les moteurs de conception N . 22
6.1 Caractéristiques de couple . 22
6.2 Courant et puissance apparente à rotor bloqué . 22
6.3 Exigences de démarrage . 23
7 Exigences de démarrage pour les moteurs de conception NE . 23
8 Exigences de démarrage pour les moteurs de conception NY et NEY . 23
9 Exigences pour les moteurs de conception H . 23
9.1 Couple de démarrage . 23
9.2 Courant et puissance apparente à rotor bloqué . 23
9.3 Exigences de démarrage . 24
10 Exigences de démarrage pour les moteurs de conception HE . 24
11 Exigences de démarrage pour les moteurs de conception HY et HEY . 24
Tableau 1 – Valeurs minimales des couples pour les moteurs de conception N . 25
Tableau 2 – Valeurs maximales de la puissance apparente à rotor bloqué pour les
moteurs des conceptions N et H . 25
Tableau 3 – Valeurs maximales de la puissance apparente à rotor bloqué pour les
moteurs des conceptions NE et HE . 26
Tableau 4 – Moment d'inertie extérieur (J) . 26
Tableau 5 – Valeurs minimales des couples pour les moteurs de conception H . 27
Tableau 6 – Valeurs minimales des couples pour les moteurs de conception N avec
type de protection 'Ex eb – sécurité augmentée' . 28
Tableau 7 – Moment d'inertie extérieur (J) pour les moteurs avec type de protection
'Ex eb – sécurité augmentée' . 29
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
MACHINES ÉLECTRIQUES TOURNANTES –
Partie 12: Caractéristiques de démarrage des moteurs triphasés
à induction à cage à une seule vitesse
AVANT-PROPOS
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