ISO 21782-1:2023

INTERNATIONAL ISO
STANDARD 21782-1
Second edition
2023-02
Electrically propelled road vehicles —
Test specification for electric
propulsion components —
Part 1:
General test conditions and
definitions
Véhicules routiers à propulsion électrique — Spécification d'essai
pour les composants de propulsion électrique —
Partie 1: Conditions générales et définitions
Reference number
© ISO 2023
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 3
5 General test conditions .4
5.1 Operating points . 4
5.1.1 Operating points for motor, inverter and motor system . 4
5.1.2 Operating points for DC/DC converter . 7
5.2 Methods for determining the rank for operating load test . 8
5.2.1 Target rank verification method . 8
5.2.2 Rank search method . 9
5.3 Provision for current, voltage and power measurement . 9
5.4 DC input voltage . 11
5.5 Temperature and humidity . 11
5.6 Measurement accuracy . 12
Annex A (informative) Formula of power .13
Bibliography .18
iii
Foreword
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electrotechnical standardization.
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www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 37,
Electrically propelled vehicles.
This second edition cancels and replaces the first edition (ISO 21782-1:2019), which has been technically
revised.
The main changes are as follows:
— addition of ISO 21782-4, ISO 21782-5 and ISO 21782-7 general specifications and requirements to
this document;
— correction of the subclause numbers cited in the Terms and definitions clause.
A list of all parts in the ISO 21782 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
Until now, there was no international standardized test procedure for the motor system including
motors, inverters DC/DC converters and their combinations for electric propulsion systems of
electrically propelled road vehicles available. There are some International Standards for industrial use
which consider the steady/constant running of motors and inverters but do not consider the dynamic
operation (acceleration/deceleration).
The ISO 21782 series was prepared aiming at the reproducibility of test results which will enable to
compare and evaluate fairly the performance and reliability of electric propulsion system components
such as the motor system (the motor, inverter, DC/DC converter and their combinations).
The overview of the ISO 21782 series is in Tables 1 to 7 shown below.
Table 1 — Contents of this document: General test conditions and definitions
Item of this document Description
Introduction Background and purpose of the ISO 21782 series
Terms and definitions Terms to use in the ISO 21782 series
Abbreviated terms Abbreviated terms to use in the ISO 21782 series
Definition of general condition:
— operating point,
— methods for determining the rank for operating load test,
— current, voltage and power,
General test conditions
— DC input voltage,
— temperature and humidity,
— measurement accuracy.
Table 2 — Contents of ISO 21782-2: Performance testing of the motor system
Item of ISO Motor DC/DC
Description Motor Inverter Chopper
21782-2 system converter
This test measures total loss and total
Measurement of
efficiency between the input power of
total loss and total  5.1
inverter and the output power of the
efficiency
motor.
This test investigates the temper-
Temperature rise ature rise characteristics of each
5.2
test part of the motor system within the
specified range.
Torque This test measures the torque
characteristic characteristics specified in the   5.3
test specifications of the motor system.
Torque ripple This test measures the torque ripple
5.4
test of the motor.
v
Table 3 — Contents of ISO 21782-3: Performance testing of the motor and the inverter
Item of ISO Motor DC/DC
Description Motor Inverter Chopper
21782-3 system converter
This test measures loss and efficien-
cy between the input power and the 5.1.1 5.2.1 5.3.1
output power.
Measurement of
loss and efficiency
This test measures conversion rate
between the input power and the  5.2.1 5.3.1
output power.
This test investigates the tempera-
Temperature rise ture rise characteristics of each part
5.1.2 5.2.2 5.3.2
test of the component within the specified
range.
Torque This test measures the torque
characteristic characteristics specified in the 5.1.3
test specifications of the motor.
This test measures the cogging
Cogging torque
torque of the permanent magnetic 5.1.4
test
motor.
Table 4 — Contents of ISO 21782-4: Performance testing of the DC/DC converter
Item of ISO Motor DC/DC
Description Motor Inverter Chopper
21782-4 system converter
This test measures loss and efficien-
Measurement of
cy between the input power and the   5.1
loss and efficiency
output power.
This test investigates the tempera-
Temperature rise ture rise characteristics of each part
5.2
test of the DC/DC converter within the
specified range.
Table 5 — Contents of ISO 21782-5: Operating load testing of the motor system
Item of ISO Motor DC/DC
Description Motor Inverter Chopper
21782-5 system converter
Cyclic test of output torque pattern
Endurance test endurance including maximum  5.1
torque and maximum speed
This test measures the surge voltage
Surge voltage
applied to the input terminals of the  5.2
measurement test
motor.
The test verifies the no control failure
Over speed test according to the over speed and gives  5.3
the corresponding rank.
Table 6 — Contents of ISO 21782-6: Operating load testing of the motor and the inverter
Item of ISO Motor DC/DC
Description Motor Inverter Chopper
21782-6 system converter
Cyclic test of high acceleration/
4.1.1
deceleration endurance
Operation
Cyclic test of torque pattern
endurance tests
endurance including maximum 4.1.2
of motor
torque
Over speed test 4.1.3
vi
TTabablele 6 6 ((ccoonnttiinnueuedd))
Item of ISO Motor DC/DC
Description Motor Inverter Chopper
21782-6 system converter
Operation Cyclic test of output current pattern
endurance tests endurance including maximum cur- 4.2.1
of inverter rent
Breakdown Contents of this test are mainly spin
strength test, data acquisition of mechanical 4.3.1
verification test strength of the motor.
Table 7 — Contents of ISO 21782-7: Operating load testing of the DC/DC converter
Item of ISO Motor DC/DC
Description Motor Inverter Chopper
21782-7 system converter
Cyclic test of output current pattern
Operation
endurance including maximum   5
endurance test
current
vii
INTERNATIONAL STANDARD ISO 21782-1:2023(E)
Electrically propelled road vehicles — Test specification
for electric propulsion components —
Part 1:
General test conditions and definitions
1 Scope
This document specifies the test procedures for performance and operating load for voltage class B
electric propulsion components (motor, inverter, DC/DC converter) and their combinations (motor
system) of electrically propelled road vehicles.
This document specifies the terms and definitions used in the ISO 21782 series and general test
conditions.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
chopper
DC electronic power converter (3.19) without an intermediate AC link giving a variable output voltage
by varying the periods of conduction and non-conduction in an adjustable ratio
[SOURCE: IEC 60050-811:2017, 811-19-11, modified — The phrase "electronic power DC convertor" was
modified to "DC electronic power converter".]
3.2
conversion rate
ratio of output base wave power or output DC power to input DC power
3.3
DC/DC converter
DC electric power converter (3.19) with an intermediate AC link transferring electric power between a
voltage class B electric circuit and a voltage class A insulated electric circuit
3.4
DC link inductor
component boosted by the chopper (3.1) circuit, a magnetic energy storage and released in response to
actuation of the switching element
3.5
efficiency
ratio of output power to input power
3.6
induction motor
IM
AC electric motor in which the electric r
...