IEC TS 60034-25:2004

Rotating electrical machines - Part 25: Guide for the design and performance of cage induction motors specifically designed for converter supply

Describes the design features and performance characteristics of polyphase cage induction motors specifically designed for use on voltage source converter supplies up to 1 000 V. Also specifies the interface parameters and interactions between the motor and the converter including installation guidance as part of a power drive system.

General Information

• Status: Published
• Publication Date: 20-Apr-2004
• ICS: 29.160.01 - Rotating machinery in general
• Technical Committee: TC 2 - Rotating machinery
• Drafting Committee: WG 26 - TC 2/WG 26
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 12-Mar-2007

Relations

• Revised: IEC TS 60034-25:2007 - Rotating electrical machines - Part 25: Guidance for the design and performance of a.c. motors specifically designed for converter supply
• Effective Date: 05-Sep-2023

Standards Content (Sample)

TECHNICAL IEC
SPECIFICATION TS 60034-25
First edition
2004-04
Rotating electrical machines –
Part 25:
Guide for the design and performance
of cage induction motors specifically designed
for converter supply
Reference number
IEC/TS 60034-25:2004(E)
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the

60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.

Consolidated editions
The IEC is now publishing consolidated versions of its publications. For example,

edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the

base publication incorporating amendment 1 and the base publication incorporating

amendments 1 and 2.
Further information on IEC publications
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology. Information relating to
this publication, including its validity, is available in the IEC Catalogue of
publications (see below) in addition to new editions, amendments and corrigenda.
Information on the subjects under consideration and work in progress undertaken
by the technical committee which has prepared this publication, as well as the list
of publications issued, is also available from the following:
• IEC Web Site (www.iec.ch)
• Catalogue of IEC publications
The on-line catalogue on the IEC web site (http://www.iec.ch/searchpub/cur_fut.htm)
enables you to search by a variety of criteria including text searches, technical
committees and date of publication. On-line information is also available on
recently issued publications, withdrawn and replaced publications, as well as
corrigenda.
• IEC Just Published
This summary of recently issued publications (http://www.iec.ch/online_news/
justpub/jp_entry.htm) is also available by email. Please contact the Customer
Service Centre (see below) for further information.
• Customer Service Centre
If you have any questions regarding this publication or need further assistance,
please contact the Customer Service Centre:
Email: [e-mail]
Tel: [phone]
Fax: [phone]
TECHNICAL IEC
SPECIFICATION TS 60034-25
First edition
2004-04
Rotating electrical machines –
Part 25:
Guide for the design and performance
of cage induction motors specifically designed
for converter supply
 IEC 2004  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale X

International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – TS 60034-25  IEC:2004(E)

CONTENTS
FOREWORD.5

INTRODUCTION.7

1 Scope.8

2 Normative references .8

3 Terms and definitions .9

4 System characteristics.10

4.1 General .10
4.2 System information.10
4.3 Torque/speed considerations.10
4.3.1 General .10
4.3.2 Torque/speed capability.11
4.3.3 Voltage/speed characteristics .12
4.3.4 Limiting factors on torque/speed capability .12
4.3.5 Resonant speed bands .13
4.3.6 Duty cycles.13
4.4 Converter control types .13
4.4.1 General .13
4.4.2 Converter type considerations .14
4.5 Converter output voltage generation.15
4.5.1 Pulse Width Modulation (PWM) .15
4.5.2 Hysteresis (sliding mode) .15
4.5.3 Influence of switching frequency.16
4.5.4 Multi-level converters .17
4.6 Motor requirements .17
5 Losses and their effects.19
5.1 General .19
5.2 Losses in motors supplied from voltage-source converters .19
5.3 Location of the extra losses and ways to reduce them .20
5.4 Converter features to reduce the motor losses .20
5.5 Temperature and life expectancy.21
5.6 Determination of motor efficiency .21

6 Noise, vibration and oscillating torques .21
6.1 Noise and vibration in an induction motor supplied from a converter.21
6.1.1 General .21
6.1.2 Changes in noise emission due to changes in speed .22
6.1.3 Magnetically excited noise.23
6.1.4 Torsional oscillation.23
6.2 Sound power level determination and limits .24
6.2.1 Methods of measurement .24
6.2.2 Test conditions .24
6.2.3 Sound power level limits.24
6.3 Vibration level determination and limits .24
6.3.1 Method of measurement .24
6.3.2 Test conditions .25
6.3.3 Vibration level limits .25

TS 60034-25  IEC:2004(E) – 3 –

7 Motor insulation electrical stresses .25

7.1 General .25

7.2 Causes.25

7.3 Winding electrical stress.27

7.4 Insulation stress limitation .29

7.5 Responsibilities .29

7.6 Converter characteristics.30

7.7 Methods of reduction of voltage stress .30

7.8 Motor choice .31

8 Bearing currents .31
8.1 Sources of bearing currents in converter-fed motors.31
8.1.1 General .31
8.1.2 Magnetic asymmetry.31
8.1.3 Electrostatic buildup .32
8.1.4 High frequency voltages .32
8.2 Generation of high frequency bearing currents .32
8.2.1 General .32
8.2.2 Circulating current .33
8.2.3 Shaft grounding current .33
8.2.4 Capacitive discharge current .33
8.3 Common-mode circuit.33
8.3.1 General .33
8.3.2 System common-mode current flow .33
8.4 Stray capacitances .34
8.4.1 General .34
8.4.2 Major component of capacitance .34
8.4.3 Other capacitances.35
8.5 Consequences of excessive bearing currents .35
8.6 Preventing high frequency bearing current damage .36
8.6.1 Basic approaches .36
8.6.2 Other preventive measures.36
9 Installation.38
9.1 Grounding, bonding and cabling .38
9.1.1 General .38
9.1.2 Grounding .38

9.1.3 Bonding of motors .39
9.1.4 Motor power cables .39
9.2 Reactors and filters .44
9.2.1 General .44
9.2.2 Output reactors.44
9.2.3 Voltage limiting filter (dv/dt filter) .44
9.2.4 Sinusoidal filter.44
9.2.5 Motor termination unit.44

Annex A (informative) Converter output spectra.46

Bibliography.48

– 4 – TS 60034-25  IEC:2004(E)

Figure 1 – Component parts of a PDS.7

Figure 2 – Torque/speed capability .11

Figure 3 – Converter output current .11

Figure 4 – Converter output voltage .12

Figure 5 – Effects of switching frequency on motor and converter losses .16

Figure 6 – Effects of switching frequency on acoustic noise.16

Figure 7 – Effects of switching frequency on torque ripple .17

Figure 8 – Example of measured losses W, as a function of frequency f and suppl
...