Rotating electrical machines - Part 30-2: Efficiency classes of variable speed AC motors (IE-code)

IEC TS 60034-30-2:2016(E) specifies efficiency classes for variable speed rotating electric machines not covered in IEC 60034-30-1. The classification only covers machines designed for operation with sinusoidal fundamental current that are not designed to be operated direct on-line (grid), for example permanent magnet synchronous machines with and without additional reluctance torque, sinusoidal reluctance synchronous machines and synchronous machines with DC field windings.

Drehende elektrische Maschinen - Teil 30-2: Wirkungsgrad-Klassifizierung von Wechselstrommotoren mit variabler Drehzahl (IE-Code)

Machines électriques tournantes - Partie 30-2: Classes de rendement des moteurs à courant alternatif à vitesse variable (code IE)

Električni rotacijski stroji - 30-2. del: Razredi izkoristka izmeničnih motorjev s spremenljivo hitrostjo (koda IE) (IEC/TS 60034-30-2:2016)

General Information

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Published
Technical Committee
Current Stage
6060 - Document made available
Due Date
23-Apr-2019

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SLOVENSKI STANDARD
SIST-TS CLC IEC/TS 60034-30-2:2021
01-december-2021

Električni rotacijski stroji - 30-2. del: Razredi izkoristka izmeničnih motorjev s

spremenljivo hitrostjo (koda IE) (IEC/TS 60034-30-2:2016)

Rotating electrical machines - Part 30-2: Efficiency classes of variable speed AC motors

(IE-code) (IEC/TS 60034-30-2:2016)
Drehende elektrische Maschinen - Teil 30-2: WirkungsgradKlassifizierung von
Wechselstrommotoren mit variabler Drehzahl (IE-Code) (IEC/TS 60034-30-2:2016)

Machines électriques tournantes - Partie 30-2: Classes de rendement des moteurs à

courant alternatif à vitesse variable (code IE) (IEC/TS 60034-30-2:2016)
Ta slovenski standard je istoveten z: CLC IEC/TS 60034-30-2:2021
ICS:
29.160.30 Motorji Motors
SIST-TS CLC IEC/TS 60034-30-2:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TS CLC IEC/TS 60034-30-2:2021
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SIST-TS CLC IEC/TS 60034-30-2:2021
TECHNICAL SPECIFICATION CLC IEC/TS 60034-30-2
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
October 2021
ICS 29.160.01
English Version
Rotating electrical machines - Part 30-2: Efficiency classes of
variable speed AC motors (IE-code)
(IEC/TS 60034-30-2:2016)

Machines électriques tournantes - Partie 30-2: Classes de Drehende elektrische Maschinen - Teil 30-2: Wirkungsgrad-

rendement des moteurs à courant alternatif à vitesse Klassifizierung von Wechselstrommotoren mit variabler

variable (code IE) Drehzahl (IE-Code)
(IEC/TS 60034-30-2:2016) (IEC/TS 60034-30-2:2016)
This Technical Specification was approved by CENELEC on 2021-08-16.

CENELEC members are required to announce the existence of this TS in the same way as for an EN and to make the TS available promptly

at national level in an appropriate form. It is permissible to keep conflicting national standards in force.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. CLC IEC/TS 60034-30-2:2021 E
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SIST-TS CLC IEC/TS 60034-30-2:2021
CLC IEC/TS 60034-30-2:2021 (E)
European foreword

This document (CLC IEC/TS 60034-30-2:2021) consists of the text of IEC/TS 60034-30-2:2016

prepared by IEC/TC 2 "Rotating machinery".

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Any feedback and questions on this document should be directed to the users’ national committee. A

complete listing of these bodies can be found on the CENELEC website.
Endorsement notice

The text of the International Technical Specification IEC/TS 60034-30-2:2016 was approved by

CENELEC as a European Technical Specification without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards

indicated:
IEC 60034-5 NOTE Harmonized as EN IEC 60034-5
IEC 60034-12 NOTE Harmonized as EN 60034-12
IEC/TS 60034-25 NOTE Harmonized as CLC/TS 60034-25
IEC/TS 60034-31 NOTE Harmonized as CLC/TS 60034-31
ISO 25745-2 NOTE Harmonized as EN ISO 25745-2
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SIST-TS CLC IEC/TS 60034-30-2:2021
CLC IEC/TS 60034-30-2:2021 (E)
Annex ZA
(normative)
Normative references to international publications with their
corresponding European publications

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.

NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod),

the relevant EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is

available here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60034-1 - Rotating electrical machines - Part 1: EN 60034-1 -
Rating and performance
IEC/TS 60034-2-3 - Rotating electrical machines - Part 2-3: EN IEC 60034-2-3 -
Specific test methods for determining
losses and efficiency of converter-fed AC
induction motors
IEC 60034-30-1 - Rotating electrical machines - Part 30-1: EN 60034-30-1 -
Efficiency classes of line operated AC
motors (IE code)
IEC 61800-9-2 - Adjustable speed electrical power drive EN 61800-9-2 -
systems - Part 9-2: Ecodesign for power
drive systems, motor starters, power
electronics and their driven applications -
Energy efficiency indicators for power drive
systems and motor starters

A new edition and common modifications are currently under preparation. Stage of these documents

at the time of publication: FprEN 60034-1 and FprEN 60034-1/prAA.
This standard has been withdrawn and replaced with IEC 60034-2-3:2020.
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SIST-TS CLC IEC/TS 60034-30-2:2021
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SIST-TS CLC IEC/TS 60034-30-2:2021
IEC TS 60034-30-2
Edition 1.0 2016-12
TECHNICAL
SPECIFICATION
Rotating electrical machines –
Part 30-2: Efficiency classes of variable speed AC motors (IE-code)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.160.01 ISBN 978-2-8322-3670-3

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

® Registered trademark of the International Electrotechnical Commission
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SIST-TS CLC IEC/TS 60034-30-2:2021
– 2 – IEC TS 60034-30-2:2016 © IEC 2016
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

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

2 Normative references ...................................................................................................... 8

3 Terms, definitions and symbols........................................................................................ 8

3.1 Terms and definitions .............................................................................................. 8

3.2 Symbols ................................................................................................................ 10

4 Efficiency classification .................................................................................................. 10

4.1 Determination ....................................................................................................... 10

4.1.1 General ......................................................................................................... 10

4.1.2 Auxiliary devices ............................................................................................ 10

4.2 Efficiency rating .................................................................................................... 11

4.3 Tolerances ............................................................................................................ 12

4.4 Classification ........................................................................................................ 12

4.5 Nominal limits for efficiency class IE1 ................................................................... 14

4.6 Nominal limits for efficiency class IE2 ................................................................... 15

4.7 Nominal limits for efficiency class IE3 ................................................................... 16

4.8 Nominal limits for efficiency class IE4 ................................................................... 17

4.9 Nominal limits for efficiency class IE5 ................................................................... 18

4.10 Interpolation of reference values at intermediate powers ....................................... 18

5 Required documentation ................................................................................................ 20

5.1 Information on the rating plate .............................................................................. 20

5.2 Information in the documentation .......................................................................... 20

Bibliography .......................................................................................................................... 22

Table 1 – IE-efficiency classification ..................................................................................... 12

Table 2 – Reference values (%) for the calculation of IE1 nominal efficiency limits ............... 14

Table 3 – Reference values (%) for the calculation of IE2 nominal efficiency limits ............... 15

Table 4 – Reference values (%) for the calculation of IE3 nominal efficiency limits ............... 16

Table 5 – Reference values (%) for the calculation of IE4 nominal efficiency limits ............... 17

Table 6 – Reference values (%) for the calculation of IE5 nominal efficiency limits ............... 18

Table 7 – Interpolation coefficients for rated powers 0,12 kW up to 0,64 kW ......................... 19

Table 8 – Interpolation coefficients for rated powers 0,65 kW up to 200 kW .......................... 20

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SIST-TS CLC IEC/TS 60034-30-2:2021
IEC TS 60034-30-2:2016 © IEC 2016 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –
Part 30-2: Efficiency classes of variable speed AC motors (IE-code)
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.

The main task of IEC technical committees is to prepare International Standards. In

exceptional circumstances, a technical committee may propose the publication of a technical

specification when

• the required support cannot be obtained for the publication of an International Standard,

despite repeated efforts, or

• the subject is still under technical development or where, for any other reason, there is the

future but no immediate possibility of an agreement on an International Standard.

Technical specifications are subject to review within three years of publication to decide

whether they can be transformed into International Standards.

IEC TS 60034-30-2, which is a technical specification, has been prepared by IEC technical

committee 2: Rotating machinery.

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.
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SIST-TS CLC IEC/TS 60034-30-2:2021
– 4 – IEC TS 60034-30-2:2016 © IEC 2016
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
2/1833/DTS 2/1850A/RVC

Full information on the voting for the approval of this technical specification can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in 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 on the IEC TC 2 dashboard on the

IEC website.

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

stability date indicated on the IEC website under "http://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.
A bilingual version of this publication may be issued at a later date.
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SIST-TS CLC IEC/TS 60034-30-2:2021
IEC TS 60034-30-2:2016 © IEC 2016 – 5 –
INTRODUCTION

This technical specification provides for the global harmonization of energy-efficiency classes

of variable speed electric motors. It deals with all types of AC low-voltage electric motors that

are rated for variable speed operation in their constant magnetic-flux speed-range (base

speed-range). An electronic frequency converter provides variable voltage and variable

frequency.

NOTE For the time being, IEC TS 60034-2-3, which is the testing basis of this document, is limited to induction

motors. However, the relevant input-output procedure 3-C is already applicable to all kinds of variable speed AC

motors. Future editions of IEC TS 60034-2-3 will have an expanded scope and include testing procedures for

synchronous machines.

This technical specification regards energy efficiency classification of AC motors rated for

variable voltage and frequency, namely induction motors and synchronous motors not covered

in IEC 60034-30-1. It is harmonized with the future standard IEC 61800-9-2 where
IE-classifications of frequency converters (complete drive modules = CDM) and
IES-classifications of power drive systems (PDS) are defined.

An efficient motor alone does not necessarily result in an efficient PDS. Users should select

the efficiency class in accordance with a given application depending on the actual load /

speed operating points and related operating time.

It may not be energy efficient to select very high efficiency S1 motors for intermittent or short

time duty or part load applications. The use of the Extended Product Approach (EPA) as

described in the future standard series IEC 61800-9 will help applicative sectors for

specification of energy efficiency performance of power driven equipment and parts.

It is not expected that all manufacturers will produce motors for all efficiency classes nor all

ratings of a given class.

IE-codes are not limited to motors, but may in future be used to classify other components

such as frequency converters and gearboxes. However, it is anticipated that other

components are rated with a comparable system: IE1 meaning low efficiency up to IE5

meaning the highest efficiency.
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SIST-TS CLC IEC/TS 60034-30-2:2021
– 6 – IEC TS 60034-30-2:2016 © IEC 2016
ROTATING ELECTRICAL MACHINES –
Part 30-2: Efficiency classes of variable speed AC motors (IE-code)
1 Scope

This part of IEC 60034, which is a technical specification, specifies efficiency classes for

variable speed rotating electric machines not covered in IEC 60034-30-1.
The document only applies to machines that:
• have a rated power P from 0,12 kW to 1 000 kW;
• have a rated voltage U above 50 V up to 1 kV;

• have a rated speed n from 600 1/min up to 6 000 1/min regardless of the number of

magnetic poles;

• are designed for cooling methods IC4A1A0 (IC410), IC4A1A1 (IC411), IC4A1A6 (IC416),

or IC4A1A8 (IC418) according to IEC 60034-6;

• are capable of continuous operation at their rated operating point (torque/power, speed)

with a temperature rise within the specified insulation temperature class;

NOTE 1 Most motors covered by this document are rated for duty type S1 (continuous duty). However, some

motors that are rated for other duty cycles are still capable of continuous operation at their rated power and these

motors are also covered. Motors rated between S3 and S10 with a cycle time of 80 % or more may be included.

• are rated for any ambient temperature within the range of – 20 °C to + 60 °C;

NOTE 2 The rated efficiency and efficiency classes are based on 25 °C ambient temperature according to

IEC 60034-2-1 and IEC TS 60034-2-3.

NOTE 3 Motors rated for temperatures outside the range – 20 °C and + 60 °C are considered to be of special

construction and are consequently excluded from this document.

NOTE 4 Smoke extraction motors with a temperature class of up to and including 400 °C are covered by this

document.
• are rated for an operating altitude up to 4 000 m above sea level.

NOTE 5 The rated efficiency and efficiency class are based on a rating for altitudes up to 1 000 m above sea

level.

The classification only covers machines designed for operation with sinusoidal fundamental

current that are not designed to be operated direct on-line (grid), for example permanent

magnet synchronous machines with and without additional reluctance torque, sinusoidal

reluctance synchronous machines and synchronous machines with DC field windings. This

also includes induction machines that are designed exclusively for variable speed operation.

Switched reluctance synchronous machines are not covered.
The procedures to determine losses at any speed and load point are given in
IEC TS 60034-2-3. They apply to all converter operated motors.

No distinction is made between motor technologies, supply voltage or motors with increased

insulation even though these motor technologies may not all be capable of reaching the

higher efficiency classes. This makes different motor technologies fully comparable with

respect to their energy efficiency potential.

The efficiency of power-drive systems (i.e. the combined losses of motor and power supply)

and the losses of the driven load are not covered by this document, see IEC 61800-9-2.

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SIST-TS CLC IEC/TS 60034-30-2:2021
IEC TS 60034-30-2:2016 © IEC 2016 – 7 –
Covered in this document are also:

• Motors with flanges, feet and/or shafts with mechanical dimensions different from

IEC 60072-1.

• Geared motors including those incorporating non-standard shafts and flanges. However,

the testing of efficiency is to be performed on the motor part of a geared motor only.

• Motors specifically built for operation in explosive environments according to IEC 60079-0.

Such motors may not be able to reach the higher efficiency classes (due to safety

requirements and possible design constraints of explosion proof motors such as increased

air-gap, reduced starting current, enhanced sealing).
Excluded from this document are:
• Motors with mechanical commutators;

• Motors completely integrated with the driven machine (for example pumps, fans and

compressors) that cannot be practically tested separately from the machine even with

provision of a temporary end-shield and drive-end bearing. This means that motors

included in this document must:

a) share common components (apart from connectors such as bolts) with the driven unit

(for example, a shaft or housing), and

b) not be designed in such a way as to enable the motor to be separated from the driven

unit as an entire motor that can operate independently of the driven unit, When the

process of separation renders the motor inoperative, it is excluded from this document.

NOTE 6 Some motors used in horizontal, inclined and vertical transport of goods and people are specifically

designed for this purpose. They are often integrated into a machine and are not brought to the market as individual

products. These motors are excluded.

• Brake motors when the brake is an integral part of the inner motor construction and can

neither be removed nor supplied by a separate power source during the testing of motor

efficiency.

Brake motors with a brake coil that is integrated into the flange of the motor are covered

as long as it is possible to test motor efficiency without the losses of the brake (for

example by dismantling the brake, removing the brake or by energizing the brake coil from

a separate power source).

• Submersible motors specifically designed to operate wholly immersed in a liquid;

• Smoke extraction motors with a temperature class above 400 °C;

• Motors that are just soft-started with a frequency-converter and then operated on

sinusoidal mains supply are rated according to IEC 60034-30-1;

• Motors that are designed for servo applications, i.e. applications where frequent overload

or field-weakening operations or frequent speed or torque changes occur or no thermal

steady state operation is reached.

NOTE 7 This document covers industrial motors which mostly run continuously at or near rated load, and whose

speed is not changing often or rapidly. Such motors include those which drive compressors and conveyor belts, for

example.

In order to achieve high efficiency at full load, magnetic flux densities within those motors are normally modest,

often resulting in larger sizes and higher inertia rotors compared with standard efficiency machines.

On the other hand, motors for servo-drive applications, such as robot drives, machine tools and pick-and-place

machines which experience frequent and rapid load and speed changes, often have low rotor inertia in order to

achieve the required dynamic performance. Energy consumption in that case is mainly determined by the energy

required for acceleration. Low inertia rotors tend to have higher losses in continuous operation, however.

Motors for servo-drives are therefore not covered by this IE-classification.

Motors are often regarded as servo motors when typically one of the following criteria is met:

−𝑎 ∙𝑃 +𝑎
1 N 2

Maximum speed criterion: 𝑛 >𝑎 ∙𝑒 +𝑎 ; with a = 6 000 1/min; a = 0,02 1/kW; a = –0,4;

max 0 3
0 1 2
a = 3 200 1/min.
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SIST-TS CLC IEC/TS 60034-30-2:2021
– 8 – IEC TS 60034-30-2:2016 © IEC 2016
max
−b ∙𝑃 +𝑏 2
1 N 2

Angular acceleration capability criterion: 𝑎𝑎𝑎 = >𝑏 ∙𝑒 +𝑏 ; with b = 18000 1/s ; b = 1,3 1/kW;

coeff 0 3
0 1
b = –1; b = 5 800 1/s .

Motors excluded from this document may be evaluated as a power drive system (PDS)

according to IEC 61800-9-2. In this case, the PDS which is composed of the motor and the

frequency converter (CDM) is evaluated as IES0, IES1 or IES2.
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 TS 60034-2-3, Rotating electrical machines – Part 2-3: Specific test methods for

determining losses and efficiency of converter-fed AC motors

IEC 60034-30-1, Rotating electrical machines – Part 30-1: Efficiency classes of line operated

AC motors (IE code)

IEC 61800-9-2, Adjustable speed electrical power drive systems – Ecodesign for power drive

systems, motor starters, power electronics and their driven applications – Part 2: Energy

efficiency indicators for power drive systems and motor starters
3 Terms, definitions and symbols
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60034-1 and the

following 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
3.1.1
variable speed motor

motor rated for a speed-range or a specific single speed and supplied by voltage of variable

amplitude and frequency
3.1.2
brake motor

motor equipped with an electro-mechanical brake unit installed directly on the motor shaft

without couplings
___________

This document already refers to the future edition of IEC TS 60034-2-3, which will contain procedures for

testing of synchronous machines on frequency converters and for interpolation of losses and efficiency over the

whole torque-speed operating range. A first committee draft (CD) should be available before the publication of

this document.
Under preparation. Stage at the time of publication: IEC/RFDIS 61800-9-2:2016.
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SIST-TS CLC IEC/TS 60034-30-2:2021
IEC TS 60034-30-2:2016 © IEC 2016 – 9 –
3.1.3
geared motor

motor equipped with an integral gearbox without couplings (i.e. the first gear wheel is fixed to

the motor shaft)
3.1.4
nominal efficiency
efficiency value required to meet a certain efficiency class

Note 1 to entry: Nominal efficiency is calculated from the reference values given in the efficiency tables or the

interpolation formula reduced by the additional harmonic losses (see r factor).
3.1.5
rated efficiency

efficiency value assigned by the manufacturer to the motor when operating on a converter at

rated speed and rated power
3.1.6
reference value
reference value of efficiency given in Tables 2 to 6 and in 4.10
3.1.7
rated speed

maximum operating speed of the constant magnetic-flux speed-range (base speed-range)

designated by the manufacturer
3.1.8
maximum speed
maximum operating speed designated by the manufacturer
3.1.9
rated power
maximum continuous output power at rated speed designated by the manufacturer
3.1.10
rated torque
maximum continuous output torque at rated speed designated by the manufacturer
3.1.11
constant magnetic-flux speed-range
base speed-range

speed-range between standstill and rated speed in which the motor can be operated with a

magnetic flux similar to rated operation (base speed-range). In this speed-range, the motor is

capable of delivering rated output torque
3.1.12
field-weakening speed-range

speed-range above rated speed up to a maximum speed in which the motor is operated with

reduced magnetic-flux (field-weakening speed-range). In this speed-range, the motor i

...

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