IEC 61800-9-2:2023

IEC 61800-9-2 ®
Edition 2.0 2023-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
GROUP ENERGY EFFICIENCY PUBLICATION
PUBLICATION GROUPÉE SUR L’ÉFFICACITÉ ÉNERGÉTIQUE
Adjustable speed electrical power drive systems (PDS) –
Part 9-2: Ecodesign for motor systems – Energy efficiency determination and
classification
Entraînements électriques de puissance (PDS) à vitesse variable –
Partie 9-2: Écoconception des systèmes moteurs – Détermination et
classification de l’efficacité énergétique

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IEC 61800-9-2 ®
Edition 2.0 2023-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
GROUP ENERGY EFFICIENCY PUBLICATION

PUBLICATION GROUPÉE SUR L’ÉFFICACITÉ ÉNERGÉTIQUE

Adjustable speed electrical power drive systems (PDS) –

Part 9-2: Ecodesign for motor systems – Energy efficiency determination and

classification
Entraînements électriques de puissance (PDS) à vitesse variable –

Partie 9-2: Écoconception des systèmes moteurs – Détermination et

classification de l’efficacité énergétique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.01; 29.160.30; 29.200 ISBN 978-2-8322-7576-4

– 2 – IEC 61800-9-2:2023 © IEC 2023
CONTENTS
FOREWORD . 9
INTRODUCTION . 11
1 Scope . 12
2 Normative references . 13
3 Terms, definitions and symbols. 14
3.1 Terms and definitions . 14
3.2 Symbols . 18
4 PDS efficiency, reference CDM (RCDM) and reference motor (RM) . 26
4.1 General . 26
4.2 Reference operating points of the PDS, RCDM, RM and associated losses . 27
4.3 Combining PDS losses with the driven equipment – Workflow for the semi-
analytical model (SAM) . 29
4.4 IE Classes of line-fed motors . 31
4.5 IE Classes of converter-fed motors . 31
4.6 IE Classes of frequency converters (complete drive modules, CDM) . 31
4.7 IES Classes of a PDS . 32
4.8 Consistency of IE and IES Classes . 32
4.9 Determination of the IES class of a PDS by application of "reference" and
"test" devices and guidance for the providers . 33
5 Determination of CDM, motor and PDS loss by calculation . 34
5.1 General . 34
5.2 CDM losses . 35
5.2.1 General procedure and definition of the CDM and the test load . 35
5.2.2 Overall CDM losses . 37
5.2.3 Loss determination of CDMs composed by combination of submodules . 38
5.2.4 Validation of loss calculation method . 40
5.3 Motor losses . 40
5.3.1 General . 40
5.3.2 Additional harmonic losses of three-phase asynchronous motors fed by
a CDM . 41
5.3.3 Motor loss data . 41
5.4 Power drive system (PDS) losses . 41
5.4.1 PDS losses . 41
5.4.2 PDS losses at different switching frequencies . 43
5.5 PDS losses for regenerative operation . 44
5.6 Losses of motor starters . 44
6 Limits of IE and IES Classes. 44
6.1 General . 44
6.2 CDM . 45
6.3 Correction factors for CDMs with modified functionality . 47
6.3.1 General . 47
6.3.2 Correction factors . 48
6.3.3 Reference losses and loss determination concept for CDMs and SDOMs
with multiple AC outputs . 49
6.4 Motor . 51
6.5 PDS . 51
7 Loss determination . 52

7.1 General . 52
7.2 Type testing of CDM or SDM for IE classification . 53
7.3 Type testing of PDS for IES classification . 54
7.4 Determination of losses by calculation . 54
7.4.1 CDM or SDM losses by calculation . 54
7.4.2 PDS losses by calculation . 55
7.5 Determination of losses by measurement, Input-output method . 55
7.5.1 Instrumentation . 55
7.5.2 Test conditions . 56
7.5.3 Input-output measurement of CDM losses . 57
7.5.4 Input-output measurement of SDIM losses . 59
7.5.5 Input-output measurement of SDOM losses . 61
7.5.6 Input-output measurement of PDS losses . 62
7.6 Calorimetric measurement of CDM losses . 63
7.7 Flowcharts for test procedures . 64
8 Requirements for the user’s documentation . 67
8.1 General . 67
8.2 Information for selection . 68
8.3 Information for determination of energy efficiency classification . 68
8.4 Information on the determination of additional energy losses and part load
conditions . 68
8.4.1 General . 68
8.4.2 Losses in part load conditions . 68
8.4.3 Losses of accessories and options . 69
8.4.4 Losses in stand-by mode . 69
8.4.5 Regenerative mode . 69
8.4.6 Characteristics and correction factors . 69
Annex A (informative) Losses of RCDM and example of IES class limit determination. 70
A.1 Relative loss tables . 70
A.2 Calculation of relative losses for IES classes . 71
A.2.1 General . 71
A.2.2 Determination of CDM relative losses . 71
A.2.3 Determination of motor relative losses . 72
A.2.4 Summation of PDS relative losses . 72
Annex B (informative) Description of the elements of an extended product using PDS
with regard to their impact on losses . 73
B.1 General . 73
B.2 Losses in the mains cabling and feeding section . 73
B.3 Input filter . 75
B.3.1 High frequency EMI filter . 75
B.3.2 Low frequency line harmonics filter . 75
B.4 Input converter . 76
B.4.1 General . 76
B.4.2 Diode rectifier . 76
B.4.3 Active infeed converter . 76
B.4.4 Power factor of the input converter . 78
B.4.5 Sub drive input module (SDIM) . 79
B.5 DC link . 79
B.6 Output inverter . 80

– 4 – IEC 61800-9-2:2023 © IEC 2023
B.6.1 General . 80
B.6.2 Sub drive output model (SDOM) . 81
B.7 Output filter and motor cables . 81
B.7.1 General . 81
B.7.2 Sine wave filters . 82
B.7.3 dV/dt filters and motor chokes . 83
B.7.4 High frequency EMI motor filters . 83
B.7.5 Motor cables . 83
B.8 Motor . 83
B.9 Mechanical load . 83
B.10 Control and standby losses . 84
B.11 Cooling losses . 84
B.11.1 Primary cooling losses . 84
B.11.2 Secondary cooling losses . 84
Annex C (informative) Mathematical model for CDM losses . 85
C.1 General . 85
C.2 Output inverter losses . 85
C.2.1 General . 85
C.2.2 Transistor on state losses . 85
C.2.3 Freewheeling diode on state losses . 86
C.2.4 Transistor switching losses . 86
C.2.5 Freewheeling diode switching losses . 87
C.2.6 Output inverter total losses . 88
C.3 Input converter losses . 88
C.3.1 Active infeed converter . 88
C.3.2 Diode rectifier . 88
C.4 Input choke losses . 89
C.5 DC link losses . 90
C.6 Current conductor losses . 90
C.7 Control and standby losses . 91
C.8 Cooling loss factor . 91
C.9 Other CDM losses . 91
Annex D (informative) Converter topology . 92
D.1 General . 92
D.2 Voltage source output inverter topologies different from those
mathematically described in Clause C.2 . 92
D.3 Voltage source input converter topologies different from those

mathematically described in Clause C.3 . 92
D.4 CDM topologies different from voltage source type . 93
Annex E (informative) Interpolation of motor losses and motor current . 94
E.1 General . 94
E.2 Relative and reference values . 94
E.3 Motor connections and operating ranges . 95
E.4 Interpolation of motor losses . 96
E.5 Interpolation of motor current . 99
E.6 Determination of the interpolation coefficients . 101
E.6.1 General . 101
E.6.2 Analytical determination. 101
E.6.3 Numerical determination . 103

E.7 Achievable accuracies . 104
E.8 Typical induction motor efficiency . 104
Annex F (informative) Application example for loss calculations of a CDM and a PDS . 110
F.1 General . 110
F.2 CDM loss determination . 110
F.2.1 General . 110
F.2.2 Loss determination by two-dimensional interpolation of losses of
neighbouring loss points . 111
F.2.3 Loss determination by the mathematical model described in Annex C . 114
F.3 Loss determination of the motor . 116
F.4 Loss determination of the PDS . 117
F.5 Determination of part load factors for SDIMs . 118
F.6 Application examples of reference losses and efficiency classes for modified
functionality . 119
F.6.1 General . 119
F.6.2 Example 1 – IE classification of an SDIM . 119
F.6.3 Example 2 – IE classification of an SDOM . 119
F.6.4 Example 3 – IE classification of a CDM with regenerative capability and
sinewave output filter . 120
Annex G (informative) Uncertainty of loss determination method. 122
G.1 General . 122
G.2 Calculation of uncertainty at randomly occurring errors . 122
G.3 Comparison of uncertainties for different loss determination methods . 122
Annex H (informative) Calorimetric measurement for CDM losses . 123
H.1 General . 123
H.2 Calorimeter with two chambers with air as a cooling medium . 123
H.3 Calorimeter with one chamber with air as a cooling medium . 124
H.4 Calorimeter with liquid as a cooling medium . 125
Annex I (informative) PDS loss calculation above rated speed and torque . 126
I.1 General . 126
I.2 Operating points above rated torque . 126
I.3 Operating points above rated speed . 126
I.3.1 General . 126
I.3.2 Dependency of motor losses on the CDM performance . 126
I.3.3 Dependency of CDM on the motor performance . 127
I.3.4 PDS loss calculation in the field weakening range up to 200 % of rated
speed . 127
Annex J (informative) Explanation for correction factors for the reference losses in
Table 8 . 128
J.1 General . 128
J.2 CDM . 128
J.2.1 CDM without regenerative capability . 128
J.2.2 CDM with regenerative capability . 129
J.2.3 CDM with DF ≤ 10 % . 130
U
J.2.4 CDM with a rated input voltage ≤ 250 V (three phase) . 130
J.2.5 CDM with single phase input . 130
J.3 SDIM and SDOM . 131
J.3.1 General . 131
J.3.2 SDIM without regenerative capability . 131

– 6 – IEC 61800-9-2:2023 © IEC 2023
J.3.3 SDIM with regenerative capability . 131
J.3.4 SDOM. 132
J.4 CDM, SDIM and SDOM with external cooling . 132
J.5 CDM and SDOM with multiple AC outputs . 132
Bibliography . 133

Figure 1 – Example of complete drive module (CDM) built by sub drive modules (SDM) . 15
Figure 2 – Illustration of the extended product with included motor system . 16
Figure 3 – Torque-speed-characteristic of servo PDS . 17
Figure 4 – Illustration of the operating points (shaft speed, torque) for the
determination of relative losses of the power drive system (PDS) . 28
Figure 5 – Illustration of the operating points (shaft speed, torque) for the
determination of relative losses of the reference motor (RM). 28
Figure 6 – Illustration of the operating points (relative motor stator frequency, relative
torque current) for the determination of losses of the reference complete drive module

(RCDM) . 29
Figure 7 – Illustration of the workflow to determine the energy efficiency index (EEI) of
an extended product . 30
Figure 8 – Illustration how to combine different data sources to determine the energy
efficiency index (EEI) of an extended product . 31
Figure 9 – Metrical relation . 32
Figure 10 – Guidance for CDM and motor providers for the usage of "test" and
"reference" devices to determine the IE/IES classes . 34
Figure 11 – Illustration of a typical CDM and test load . 35
Figure 12 – Example of relative losses p of the 9,95 kVA RCDM . 38
L,CDM
Figure 13 – Example of the relative power losses of PDS as function of speed and
torque . 43
Figure 14 – Example representation of the relative power losses versus switching
frequency of a 7,5 kW to 11 kW PDS . 43
Figure 15 – Example of a CDM with resistor for dissipating generated power . 44
Figure 16 – Illustration of IE Classes for a CDM . 47
Figure 17 – Topology of a CDM with multiple AC outputs . 50
Figure 18 – Losses of CDM or SDM are provided as the sum of the determined losses

plus the uncertainty of the determination method . 53
Figure 19 – Input-output measurement setup for determination of CDM losses . 58
Figure 20 – Order of CDM measurements from [1] to [8] . 58
Figure 21 – Input-output measurement setup for determination of SDIM losses . 60
Figure 22 – Input-output measurement setup for determination of SDOM losses . 61
Figure 23 – Input-output measurement setup for PDS losses . 62
Figure 24 – Order of PDS measurements from [1] to [8] . 63
Figure 25 – Calorimetric measurement setup for determining CDM losses . 64
Figure 26 – Determination of IE classification for CDM and loss determination for part
load operating points . 65
Figure 27 – Determination of IES classification for PDS and loss determination for part
load operating points . 66
Figure B.1 – Overview of the extended product and energy flow . 73
Figure B.2 – Equivalent circuit of the mains and mains cabling . 74

Figure B.3 – Illustration of a single-phase line harmonics filter . 75
Figure B.4 – PDS with a diode rectifier input converter . 76
Figure B.5 – PDS with a standard AIC input converter . 77
Figure B.6 – PDS with a F3E-AIC input converter without line choke . 77
Figure B.7 – Typical waveform of a diode rectifier line current . 78
Figure B.8 – DC link circuit . 79
Figure B.9 – DC link circuit with additional DC chokes . 80
Figure B.10 – Output inverter of the PDS . 81
Figure B.11 – Motor cable and optional output filter of the PDS . 82
Figure B.12 – Typical waveform of inverter output voltage and motor voltage when
using a sine wave output filter . 82
Figure E.1 – Normalized torque and speed of ranges a and b for connection Y or D . 95
Figure E.2 – Normalized torque and speed of ranges a and b for connection Y  D . 96
Figure E.3 – Normalized torque and speed of range a for connection Y  YY . 96
Figure E.4 – Normalized losses of an exemplary motor in connection Y or D . 97
Figure E.5 – Normalized losses of an exemplary motor in connection Y  D . 97
Figure E.6 – Normalized losses of an exemplary motor in connection Y  YY . 98
Figure E.7 – Efficiency map of the exemplary motor in connection Y or D . 98
Figure E.8 – Efficiency map of the exemplary motor in connection Y  D . 99
Figure E.9 – Efficiency map of the exemplary motor in connection Y  YY . 99
Figure E.10 – Line-current of the exemplary motor in connection Y or D . 100
Figure E.11 – Line-current of the exemplary motor in connection Y  D . 100
Figure E.12 – Line-current of the exemplary motor in connection Y  YY . 101
Figure E.13 – Standardized operating points of IEC 60034-2-3 . 102
Figure F.1 – Segments of operating points . 110
Figure F.2 – Two-dimensional interpolation . 111
Figure H.1 – One-step calorimetric measurement setup for comparative loss

measurement (CDM and heating resistor are loaded simultaneously). 123
Figure H.2 – Two-step calorimetric measurement setup for comparative loss
measurement (CDM and heating resistor are not loaded simultaneously) . 124
Figure H.3 – Liquid cooled calorimetric measurement setup for CDM loss measurement. 125

Table 1 – Minimum test load currents at different points of operation . 36
Table 2 – Test load displacement factor between fundamental output current and
fundamental output voltage at different points of operation . 36
Table 3 – Example of relative losses of the 400 V/9,95 kVA reference CDM at the
operating points described in Figure 6 . 38
Table 4 – Active SDIM power ratio to be used for loss calculation at the CDM operating
points. 40
Table 5 – Reference parameter for Formula (13). 42
Table 6 – Relative losses of the 400 V/7,5 kW PDS . 42
Table 7 – Reference CDM losses for class IE1 definition . 45
Table 8 – Correction factors for different CDM, SDIM and SDOM characteristics . 49
Table 9 – Information requirements . 67

– 8 – IEC 61800-9-2:2023 © IEC 2023
Table A.1 – Relative losses (%) of reference CDMs (IE1) at different power ratings at
the operating points described in Figure 6 . 70
Table A.2 – Relative losses of the 9,95 kVA CDM according to Table A.1 . 71
Table B.1 – Typical values of λ for different input converter topologies . 78
Table C.1 – Reference parameters for Formula (C.1) . 85
Table C.2 – Variables for Formula (C.1) . 86
Table C.3 – Reference parameters for Formula (C.2) . 86
Table C.4 – Reference parameters for Formula (C.3) . 87
Table C.5 – Reference parameters for Formula (C.4) . 87
Table C.6 – Reference parameters for Formula (C.6) . 89
Table C.7 – Variables for Formula (C.6) . 89
Table C.8 – Reference parameters for Formula (C.7) . 89
Table C.9 – Reference parameters for Formula (C.8) . 90
Table C.10 – Reference parameters for Formula (C.9) . 90
Table C.11 – Reference parameter for Formula (5) . 91
Table C.12 – Reference parameter for Formula (C.10) . 91
Table E.1 – Normative operating points of IEC 60034-2-3 . 101
Table E.2 – Interpolation coefficients of typical 4-pole IE2 induction machines . 105
Table E.3 – Interpolation coefficients of typical 2-pole IE2 induction machines . 106
Table E.4 – Interpolation coefficients of typical 4-pole IE3 induction machines . 107
Table E.5 – Interpolation coefficients of typical 4-pole IE4 induction machines . 108
Table E.6 – Interpolation coefficients of typical 4-pole IE5 induction machines . 109
Table F.1 – Relative losses of a 400 V/9,95 kVA example CDM (IE1) at the predefined

operating points . 111
Table F.2 – Parameters of the example CDM . 115
Table F.3 – Results of the CDM calculation according to the mathematical model . 116
Table F.4 – Comparison of different loss evaluation methods . 116
Table F.5 – Loss data of the 7,5 kW example motor . 116
Table F.6 – Calculated part-load factors for SDIM part load operation points . 118

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ADJUSTABLE SPEED ELECTRICAL POWER DRIVE SYSTEMS (PDS) –

Part 9-2: Ecodesign for motor systems –
Energy efficiency determination and classification

FOREWORD
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