ISO 21782-5:2021

INTERNATIONAL ISO
STANDARD 21782-5
First edition
2021-05
Electrically propelled road vehicles —
Test specification for electric
propulsion components —
Part 5:
Operating load testing of the motor
system
Véhicules à propulsion electrique — Spécification d'essai pour les
composants de propulsion électrique —
Partie 5: Essai de charge de fonctionnement d'un système de moteur
Reference number
©
ISO 2021
© ISO 2021
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ii © ISO 2021 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 1
5 Tests and requirements . 1
5.1 Endurance test . 1
5.1.1 General. 1
5.1.2 Test diagram . 2
5.1.3 Test conditions. 2
5.1.4 Test procedure . 3
5.1.5 Test requirements . 5
5.2 Surge voltage measurement test . 6
5.2.1 General. 6
5.2.2 Test diagram . 6
5.2.3 Test conditions. 7
5.2.4 Test procedure . 8
5.2.5 Test requirements . 8
5.3 Over speed test . 8
5.3.1 General. 8
5.3.2 Test diagram . 8
5.3.3 Test conditions. 9
5.3.4 Test procedure . 9
5.3.5 Test requirements . 9
6 Test report . 9
Annex A (informative) Methods for determining the rank for over speed test .10
Annex B (informative) Test report .12
Foreword
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electrotechnical standardization.
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described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
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iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 37,
Electrically propelled vehicles.
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 © ISO 2021 – All rights reserved

INTERNATIONAL STANDARD ISO 21782-5:2021(E)
Electrically propelled road vehicles — Test specification
for electric propulsion components —
Part 5:
Operating load testing of the motor system
1 Scope
This document specifies operating load tests and test criteria for the motor system designed as a
voltage class B electric propulsion system for electrically propelled road vehicles.
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.
ISO 21782-1:2019, Electrically propelled road vehicles — Test specification for electric propulsion
components — Part 1: General test conditions and definitions
ISO 21498-1, Electrically propelled road vehicles — Specification of voltage sub-classes for voltage class B
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 21782-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Symbols and abbreviated terms
For the purposes of this document, symbols and abbreviated terms given in ISO 21782-1 apply.
5 Tests and requirements
5.1 Endurance test
5.1.1 General
The purpose of this test is to evaluate and rank the strength for the components – motor shaft key,
rotor fixture, shaft tightening part, stator fixtures, power semiconductor chip, and DC bus capacitor –
which are affected by mechanical or electrical fatigue. The test is set considering repeated operations
at the upper specification limits of the motor system, which operate under the conditions of the paired
inverter and motor combination. Unless otherwise specified, the test method can be decided by the
supplier and customer.
5.1.2 Test diagram
The test diagram is shown in Figure 1.
Key
1 DUT
2 motor
3 inverter
4 DC power supply
5 load
6 torque / speed detector
7 power meter
8 torque / speed meter
9 thermo meter
10 inverter output current (in A)
11 motor torque (in Nm)
-1
12 motor speed (in min )
13 measurement points temperatures (in °C)
Figure 1 — Diagram for the endurance test of the motor system
5.1.3 Test conditions
Test conditions are shown in Table 1.
Table 1 — Conditions for endurance test of the motor system
Items Value Remark
Inverter input voltage Rated voltage as defined in ISO 21782- — DC voltage tolerance, see ISO
1:2019, 3.22 21782-1:2019, 5.3
Ambient conditions Room temperature (RT) and humidity as
defined in ISO 21782-1:2019, 5.4
Coolant tem- Liquid Maximum temperature for unlimited operat- — Ethylene glycol and propylene
perature ing capability glycol as example of coolant
Air Maximum temperature for unlimited operat-
ing capability
Coolant flow Liquid Minimum flow rate for unlimited operating
rate capability
Air Minimum flow rate for unlimited operating
capability
2 © ISO 2021 – All rights reserved

5.1.4 Test procedure
The test pattern consisting of maximum torque mode and maximum speed mode is shown in Figure 2.
Time parameter t , t and t in Figure 2 shall be as shown in Table 2. The tests shall be conducted by
1 2 3
alternating the maximum torque mode and maximum speed mode as shown in Figure 3 and Table 3.
The tests shall be conducted by repeating the number of cycles according to the corresponding rank
listed in Table 4. The temperature of each part of the motor system shall be controlled so that they are
substantially equal to the saturation temperature.
NOTE To protect torque meter, test can be performed without it, after setting up the maximum torque. In
that case, torque meter can be replaced by power meter to measure motor input currents.
a) maximum torque mode b) maximum speed mode
Key
t time (in s)
-1
n speed (in min )
-1
n rated speed (in min )
r
-1
n maximum speed (in min )
m
M torque (in Nm)
M maximum torque of the motor system for duration of t =2 (in Nm)
t=2 0
M calculated torque of the motor system at operating point “c” (in Nm)
c
s 1 cycle
t , t , t time parameter
1 2 3
Figure 2 — Endurance test pattern for the motor system
Table 2 — Description of time parameter in Figure 2
Time
Requirements and recommendations
parameters
t This shall be reduced to the technically possible minimum.
t This should be shorter than 1 s.
Table 2 (continued)
Time
Requirements and recommendations
parameters
t Thi
...