Rotating electrical machines - Dimensions and output series - Part 1: Frame numbers 56 to 400 and flange numbers 55 to 1080

IEC 60072-1:2022 is applicable for the majority of rotating electrical machines for industrial purposes within the dimension range and output powers.
- Foot- mounted: shaft heights: 56 mm to 400 mm
- Flange- mounted: pitch circle diameter of flange: 55 mm to 1 080 mm.
This seventh edition cancels and replaces the sixth edition published in 1991. This edition includes the following significant technical changes with respect to the previous edition:
a. modification of the series title;
b. complete revision on the basis of EN 50347;
c. integration of the relationships between frame size, shaft extensions, rated outputs and flange numbers;
d. additional tolerances and measurements for shafts;
e. modification of Annex A with additional frame numbers and relationships between frame size and rated power.

Machines électriques tournantes - Dimensions et séries de puissances - Partie 1: Désignation des carcasses entre 56 et 400 et des brides entre 55 et 1080

IEC 60072-1:2022 s'applique à la majorité des machines électriques tournantes pour usages industriels qui relèvent de la plage de dimensions et des puissances concernées:
- Fixation par pattes: hauteur d'axe; entre 56 mm et 400 mm.
- Fixation par bride: diamètre du cercle primitif de la bride: entre 55 mm et 1 080 mm.
Cette septième édition annule et remplace la sixième édition parue en 1991. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a. modification du titre de la série;
b. révision complète par rapport à l'EN 50347;
c. ajout de l'article Correspondance entre les dimensions de carcasses, les bouts d'arbre, les puissances assignées et les désignations de brides;
d. ajout de tolérances et de mesurages pour les arbres;
e. modification de l'Annexe A, notamment ajout de désignations de carcasses supplémentaires et de la correspondance entre les dimensions de carcasses et la puissance assignée.

General Information

Status
Published
Publication Date
29-Mar-2022
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
30-Mar-2022
Ref Project

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IEC 60072-1
Edition 7.0 2022-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Rotating electrical machines – Dimensions and output series –
Part 1: Frame numbers 56 to 400 and flange numbers 55 to 1080
Machines électriques tournantes –Dimensions et séries de puissances –
Partie 1: Désignation des carcasses entre 56 et 400 et des brides
entre 55 et 1080
IEC 60072-1:2022-03(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60072-1
Edition 7.0 2022-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Rotating electrical machines – Dimensions and output series –
Part 1: Frame numbers 56 to 400 and flange numbers 55 to 1080
Machines électriques tournantes –Dimensions et séries de puissances –
Partie 1: Désignation des carcasses entre 56 et 400 et des brides
entre 55 et 1080
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.160.01 ISBN 978-2-8322-1093-0

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60072-1:2022 © IEC 2022
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 6

4 Symbols .......................................................................................................................... 7

4.1 Letter symbols for dimensions ................................................................................. 7

4.2 Dimensional sketches ............................................................................................. 9

5 Designations of machines .............................................................................................. 10

5.1 Frame sizes .......................................................................................................... 10

5.2 Flange numbers .................................................................................................... 10

5.3 Shaft extension ..................................................................................................... 10

6 Location of the terminal box ........................................................................................... 10

6.1 Machines with feet ................................................................................................ 10

6.2 Machines without feet ........................................................................................... 10

7 Fixing dimensions and tolerances .................................................................................. 11

7.1 General ................................................................................................................. 11

7.2 Foot-mounted machines ........................................................................................ 11

7.3 Flange-mounted machines .................................................................................... 12

8 Shaft end dimensions and tolerances ............................................................................ 13

8.1 Shaft end dimenions ............................................................................................. 13

8.2 Parallelism of shaft to foot face ............................................................................. 16

8.3 Parallelism of keyway to shaft axis ........................................................................ 16

8.4 Lateral displacement of keyway ............................................................................ 16

9 Methods of measurement .............................................................................................. 16

9.1 General ................................................................................................................. 16

9.2 Shaft extensions run-out ....................................................................................... 17

9.3 Concentricity of spigot and shaft ........................................................................... 17

9.4 Perpendicularity of mounting face of flange to shaft .............................................. 17

9.5 Parallelism of shaft to foot face ............................................................................. 18

9.6 Parallelism of keyway to shaft axis ........................................................................ 19

9.7 Lateral displacement of keyway ............................................................................ 19

10 Preferred rated output values ........................................................................................ 19

11 Relationships between frame size, shaft extensions, rated outputs and flange

numbers ........................................................................................................................ 21

Annex A (informative) Additional relationships for frame sizes and output ratings ................ 24

Annex B (informative) Additional recommended letters and dimensions ............................... 25

Bibliography .......................................................................................................................... 26

Figure 1 – Dimensional sketches ............................................................................................ 9

Figure 2 – Illustration of the measurement of shaft extensions run-out .................................. 17

Figure 3 – Illustration of the measurement of concentricity .................................................... 17

Figure 4 – Illustration of the measurement of perpendicularity .............................................. 18

Figure 5 – Illustration of the measurement of parallelism ...................................................... 18

Figure 6 – Illustration of parallelism of keyway ...................................................................... 19

Figure 7 – Illustration of lateral displacement of keyway ....................................................... 19

---------------------- Page: 4 ----------------------
IEC 60072-1:2022 © IEC 2022 – 3 –

Table 1 – Dimensions for machines with shaft height from 56 mm to 400 mm ....................... 11

Table 2 – Dimensions and tolerances for flanges with pitch circle diameters from 55

mm to 1 080 mm ................................................................................................................... 12

Table 3 – Dimensions and tolerances for shaft ends ............................................................. 14

Table 4 – Tolerance for parallelism shaft to foot face ............................................................ 16

Table 5 – Tolerance for parallelism of keyway to shaft axis ................................................... 16

Table 6 – Preferred rated output values ................................................................................ 20

Table 7 – Totally enclosed fan-cooled induction motors (IC41) with squirrel-cage rotor ........ 21

Table 8 – Totally enclosed fan cooled induction motors (IC41) with slip ring rotor ................. 22

Table 9 – Ventilated induction motors (IC01) with squirrel-cage rotor .................................... 23

Table 10 – Ventilated induction motors (IC01) with slip ring rotor .......................................... 23

Table A.1 – Relationships between frame size and rated output for 50 Hz increased

safety "eb" ............................................................................................................................ 24

Table B.1 – Additional frame letters and B dimensions in mm ............................................... 25

---------------------- Page: 5 ----------------------
– 4 – IEC 60072-1:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –
DIMENSIONS AND OUTPUT SERIES –
Part 1: Frame numbers 56 to 400 and flange
numbers 55 to 1080
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

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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 60072-1 has been prepared by IEC technical committee 2: Rotating

machinery.

This seventh edition cancels and replaces the sixth edition published in 1991. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) modification of the series title;
b) complete revision on the basis of EN 50347;

c) integration of the relationships between frame size, shaft extensions, rated outputs and

flange numbers;
d) additional tolerances and measurements for shafts;
---------------------- Page: 6 ----------------------
IEC 60072-1:2022 © IEC 2022 – 5 –

e) modification of Annex A with additional frame numbers and relationships between frame

size and rated power.
The text of this International Standard is based on the following documents:
Draft Report on voting
2/2059/CDV 2/2082/RVC

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.

A list of all parts in the IEC 60072 series, published under the general title Rotating electrical

machines – Dimensions and output series, can be found on the IEC website.

Future documents in this series will carry the new general title as cited above. Titles of existing

documents in this series will be updated at the time of the next edition.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under webstore.iec.ch in the data related to the

specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 7 ----------------------
– 6 – IEC 60072-1:2022 © IEC 2022
ROTATING ELECTRICAL MACHINES –
DIMENSIONS AND OUTPUT SERIES –
Part 1: Frame numbers 56 to 400 and flange
numbers 55 to 1080
1 Scope

This part of IEC 60072 is applicable for the majority of rotating electrical machines for industrial

purposes within the dimension range and output powers:
Foot- mounted: shaft heights: 56 mm to 400 mm.
Flange- mounted: pitch circle diameter of flange: 55 mm to 1 080 mm.

It specifies the fixing dimensions, shaft extension dimensions and the assignment of output

powers and frame sizes.
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 60079-0, Explosive atmospheres – Part 0: Equipment – Generel requirements

ISO 128-3:2020, Technical product documentation (TPD) – General principles of representation

– Part 3: Views, sections and cuts
ISO 273, Fasteners – Clearance holes for bolts and screws

ISO 286 (all parts), Geometrical product specifications (GPS) – ISO code system for tolerances

on linear sizes

ISO 1101, Geometrical product specifications (GPS) – Geometrical tolerancing – Tolerances of

form, orientation, location and run-out

ISO 2768-1, General tolerances – Part 1: Tolerances for linear and angular dimensions without

individual tolerance indications
3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminology 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
---------------------- Page: 8 ----------------------
IEC 60072-1:2022 © IEC 2022 – 7 –
4 Symbols
4.1 Letter symbols for dimensions

The dimensional sketches in Figure 1 illustrate the symbols defined below. Mandatory

dimensions are marked with *.
*A distance between centre-lines of fixing holes (end view)
AA width of the end of the feet (end view)
AB overall dimension across the feet (end view)

AC maximum width (envelope size) of the machine (e.g. fan cover; excluded are terminal

box and feet)
AC’ maximum height (envelope size) of the machine

AD distance from the centre-line of the machine to extreme outside of the terminal box or

other most salient part mounted on the side of the machine
*B distance between the centre-lines of the fixing holes (side view)
BA length of the feet (drive end side; side view)
BB overall dimension across the feet (side view)

BC distance from the shoulder on the shaft at D-end to the beginning of the foot (side view)

BD length of the feet (non-drive end side; side view)

*C distance from the shoulder on the shaft at D-end to the centre-line of the mounting holes

in the nearest feet

CA distance from the shoulder on the shaft at N-end to the centre-line of the mounting holes

in the nearest feet
*CB rounding fillet at the shoulder on the shaft at D-end
CC rounding fillet at the shoulder on the shaft at N-end
*D diameter of the shaft extension at D-end
DA diameter of the shaft extension at N-end
*DB thread-size in the centre hole at D-end
DC thread-size in the centre hole at N-end
*E length of the shaft extension from the shoulder at D-end
EA length of the shaft extension from the shoulder at N-end
*EB length of the key at D-end
EC length of the key at N-end

*ED distance from the shoulder on the shaft at D-end to the nearest end of the keyway

EE distance from the shoulder on the shaft at N-end to the nearest end of the keyway

*F width of the keyway or key of the shaft extension at D-end
FA width of the keyway or key of the shaft extension at N-end
*FB rounding fillet in the bottom of the keyway at D-end
FC rounding fillet in the bottom of the keyway at N-end

G distance from the bottom of the keyway to the opposite surface of the shaft extension at

D-end

*GA distance from the top of the key to the opposite surface of the shaft extension at D-end

GB distance from the bottom of the keyway to the opposite surface of the shaft extension at

N-end

GC distance from the top of the key to the opposite surface of the shaft extension at N-end

*GD height of the key of the shaft extension at D-end
---------------------- Page: 9 ----------------------
– 8 – IEC 60072-1:2022 © IEC 2022
*GE depth of the keyway at the crown of the shaft extension at D-end
GF height of the key of the shaft extension at N-end
GH depth of the keyway at the crown of the shaft extension at N-end

*H distance form the centre-line of the shaft to the bottom of the feet (basic dimension)

HA thickness of the feet
HC distance from the top of the horizontal machine to the bottom of the feet

HD distance from the top of the lifting eye, the terminal box or other most salient part

mounted on the top of the machine to the bottom of the feet

*K diameter of the holes or width of the slots (end view) in the feet of the machine

KA in case of long holes: width of the slots (side view) in the feet
L overall length of the machine with a single shaft extension
LA thickness of the flange
LB distance from the mounting surface of the flange to the end of the machine
LC overall length of the machine when there is a shaft extension at N-end
LR distance from the end of the machine to the ring bolt
*M pitch circle diameter of the fixing holes
*N diameter of the spigot

*P outside diameter of the flange, or in the case of a non-circular outline twice the maximum

radial dimension

*R distance from the mounting surface of the flange to the shoulder on the shaft

*S diameter of the fixing holes in the mounting flange or nominal diameter of thread

SR thread diameter of ring bolt
*T depth of the spigot
NOTE The definition of D-end and N-end of a motor is given in IEC 60034-7.
---------------------- Page: 10 ----------------------
IEC 60072-1:2022 © IEC 2022 – 9 –
4.2 Dimensional sketches
Key

1) FF - flange with through holes; access to back; FT - flange with thread; no access to back

2) This ISO symbol indicates the projection method used (ISO 128-3:2020)
Figure 1 – Dimensional sketches
---------------------- Page: 11 ----------------------
– 10 – IEC 60072-1:2022 © IEC 2022
5 Designations of machines
5.1 Frame sizes

Electrical machines may be designated by the frame size. The frame sizes are defined as the

distance from the centre line of the shaft to the bottom of the feet (H dimension). The dimensions

for H and the correlation to the fixing dimensions (A, B, C and K) are given in Table 1.

Recommended letters for frame sizes:
S short length frame size;
M middle length frame size;
L long length frame size.
Additional recommended frame number letters are given in Annex B, Table B.1.
NOTE The frame sizes are also applicable for non feet motors.
5.2 Flange numbers

The flange numbers are defined as the pitch circle diameter M. The dimensions for M and the

correlation to the fixing dimensions (N, P, R, S and T) are given in Table 2. The location of the

holes in the mounting flange are shown in Figure 1.
Recommended letters for flange numbers:
FF flange with through holes;
FT flange with thread.
5.3 Shaft extension

The designation of the shaft is defined with the diameter of the shaft extension D. The

dimensions for D and the correlation to the relevant dimensions (e.g. E, Key) are given in

Table 3.
6 Location of the terminal box
6.1 Machines with feet

The terminal box on a motor should be situated with its centre-line within a sector ranging from

the top to 10° below the horizontal centre-line of the motor on the right hand side, when looking

at the D-end of the motor.

It is recommended that unless the terminal box is on the top, motors be so constructed that the

terminal box may be located on the left-hand side by the manufacturer, if requested by the user

at the time when the motor is ordered.

NOTE Provision is preferably made so as to enable the cable entry to the terminal box to be in any one of the four

directions at right angles.
6.2 Machines without feet
No recommendation.
---------------------- Page: 12 ----------------------
IEC 60072-1:2022 © IEC 2022 – 11 –
7 Fixing dimensions and tolerances
7.1 General

Shaft extension, flange numbers, foot dimension and output allocation to frame size are given

in Clause 11, Table 7 through Table 10.
7.2 Foot-mounted machines
A, B, C and K dimensions shall be selected from Table 1.
Table 1 – Dimensions for machines with shaft height from 56 mm to 400 mm
d d d b c
Frame H A B C K Bolt or
number screw
Nominal
mm mm mm mm
Nominal Maximum
deviation
mm mm
56M 56 −0,5 90 71 36 5,8 M5
63M 63 −0,5 100 80 40 7 M6
71M 71 −0,5 112 90 45 7 M6
80M 80 −0,5 125 100 50 10 M8
90S 90 −0,5 140 100 56 10 M8
90L 90 −0,5 140 125 56 10 M8
100L 100 −0,5 160 140 63 12 M10
(112S) 112 −0,5 190 114 70 12 M10
112M 112 −0,5 190 140 70 12 M10
(112L) 112 −0,5 190 159 70 12 M10
132S 132 −0,5 216 140 89 12 M10
132M 132 −0,5 216 178 89 12 M10
(132L) 132 −0,5 216 203 89 12 M10
(160S) 160 −0,5 254 178 108 14,5 M12
160M 160 −0,5 254 210 108 14,5 M12
160L 160 −0,5 254 254
108 14,5 M12
(180S) 180 −0,5 279 203 121 14,5 M12
180M 180 −0,5 279 241 121 14,5 M12
180L 180 −0,5 279 279 121 14,5 M12
(200S) 200 −0,5 318 228 133 18,5 M16
200M 200 −0,5 318 267 133 18,5 M16
200L 200 −0,5 318 305 133 18,5 M16
225S 225 −0,5 356 286
149 18,5 M16
225M 225 −0,5 356 311 149 18,5 M16
(225L) 225 −0,5 356 356 149 18,5 M16
250S 250 −0,5 406 311 168 24 M20
250M 250 −0,5 406 349 168 24 M20
(250L) 250 −0,5 406 406 168 24 M20
---------------------- Page: 13 ----------------------
– 12 – IEC 60072-1:2022 © IEC 2022
d d d b c
Frame H A B C K Bolt or
number screw
Nominal
mm mm mm mm
Nominal Maximum
deviation
mm mm
280S 280 −1 457 368 190 24 M20
280M 280 −1 457 419 190 24 M20
(280L) 280 −1 457 457 190 24 M20
315S 315 −1 508 406 216 28 M24
315M 315 −1 508 457 216 28 M24
(315L) 315 −1 508 508 216 28 M24
355S 355 −1 610 500 254 28 M24
355M 355 −1 610 560 254 28 M24
355L 355 −1 610 630 254 28 M24
400S 400 −1 686 560 280 35 M30
400M 400 −1 686 630 280 35 M30
400L 400 −1 686 710 280 35 M30

Frame numbers within brackets should be regarded as non preferred for AC induction machines.

The nominal K dimensions are selected from the coarse series in ISO 273 and have a tolerance of H17

according to the ISO 286 series. For long holes the tolerance applies to the width of the slot. Open-ended slots

are not recommended.
Recommended bolt or screw for fixing the motor-feet to the basement.
The tolerance of this dimension is taken from the coarse series in ISO 2768-1.
7.3
...

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