IEC 60034-2-3:2020

IEC 60034-2-3 ®
Edition 1.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Rotating electrical machines –
Part 2-3: Specific test methods for determining losses and efficiency of
converter-fed AC motors
Machines électriques tournantes –
Partie 2-3: Méthodes d'essai spécifiques pour la détermination des pertes
et du rendement des moteurs à courant alternatif alimentés par convertisseur

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IEC 60034-2-3 ®
Edition 1.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Rotating electrical machines –

Part 2-3: Specific test methods for determining losses and efficiency of

converter-fed AC motors
Machines électriques tournantes –

Partie 2-3: Méthodes d'essai spécifiques pour la détermination des pertes

et du rendement des moteurs à courant alternatif alimentés par convertisseur

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.160.01 ISBN 978-2-8322-7842-0

– 2 – IEC 60034-2-3:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Symbols and abbreviated terms . 9
5 Basic requirements . 10
5.1 Instrumentation . 10
5.1.1 General . 10
5.1.2 Power analyser and transducers . 10
5.1.3 Mechanical output of the motor . 11
5.2 Converter set-up . 11
5.2.1 General . 11
5.2.2 Comparable converter set-up for rated voltages up to 1 kV . 11
5.2.3 Testing with converters with rated voltages above 1 kV . 12
5.2.4 Testing with other converters . 12
6 Test method for the determination of the efficiency of converter-fed motors . 12
6.1 Selection of determination method . 12
6.2 Method 2-3-A – Direct measurement of input and output . 13
6.2.1 Test set-up . 13
6.2.2 Test procedure . 13
6.2.3 Efficiency determination. 13
6.2.4 Measurement at seven standardized operating points . 14
6.3 Method 2-3-B – Summation of losses with determination of additional high
frequency loss at converter supply at no-load operation . 14
6.3.1 General . 14
6.3.2 Test set-up . 14
6.3.3 Test procedure . 14
6.3.4 Efficiency determination. 15
6.4 2-3-C – Alternate Efficiency Determination Method (AEDM) . 15
6.5 2-3-D – Determination of efficiency by calculation . 15
7 Interpolation of losses at any operating point . 16
7.1 General . 16
7.2 Interpolation procedure . 16
7.3 Analytical determination of relative losses at any operating point . 16
7.4 Additional losses due to frequency converter voltage drop . 18
7.5 Alternate operating points to determine interpolation coefficients . 18
7.6 Optional determination of interpolation error . 19
Annex A (informative) Losses of AC motors . 21
A.1 General . 21
A.2 Stator and rotor winding I R losses P (P + P ) . 21
LSR LS LR
A.3 Iron losses (P ) . 21
Lfe
A.4 Additional load losses (P ) . 22
LL
A.5 Friction and windage losses (P ) . 22
Lfw
A.6 Additional high frequency losses (P ) . 23
LHL
Annex B (informative) Exemplary determination of losses and efficiency at various
load points . 24
B.1 General . 24
B.2 Determination of the interpolation coefficients . 24
B.3 Calculation of losses and efficiency for certain operating points . 25
Bibliography . 27

Figure 1 – Standardized operating points . 17

Table 1 – Preferred test methods . 12
Table 2 – Other test methods . 13
Table 3 – Normative operating points . 17
Table 4 – Non-normative alternate operating points . 19
Table A.1 – Recommended split of windage and friction losses for IC 411 self-
ventilated motors . 22
Table B.1 – Name plate data . 24
Table B.2 – Reference values . 24
Table B.3 – Losses for the 7 operating points . 25
Table B.4 – Interpolation coefficients . 25
Table B.5 – User-defined operating points . 26
Table B.6 – Calculated losses for the user-defined operating points . 26

– 4 – IEC 60034-2-3:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –

Part 2-3: Specific test methods for determining losses and
efficiency of converter-fed AC 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
...