ISO 21782-2:2019

INTERNATIONAL ISO
STANDARD 21782-2
First edition
2019-08
Electrically propelled road vehicles —
Test specification for electric
propulsion components —
Part 2:
Performance testing of the motor
system
Reference number
©
ISO 2019
© ISO 2019
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ii © ISO 2019 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 1
5 Tests . 1
5.1 Measurement of total loss and total efficiency . 1
5.1.1 General. 1
5.1.2 Test diagram . 1
5.1.3 Test conditions. 2
5.1.4 Test procedure . 3
5.2 Temperature rise test . 3
5.2.1 General. 3
5.2.2 Test diagram . 3
5.2.3 Test conditions. 4
5.2.4 Test procedure . 5
5.3 Torque characteristic test . 5
5.3.1 General. 5
5.3.2 Test diagram . 5
5.3.3 Test conditions. 6
5.3.4 Test procedure . 7
5.4 Torque ripple test . 7
5.4.1 General. 7
5.4.2 Test diagram . 7
5.4.3 Test conditions. 7
5.4.4 Test procedure . 8
6 Test reports . 8
Annex A (informative) Test reports . 9
Bibliography .12
Foreword
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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
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iv © ISO 2019 – All rights reserved

INTERNATIONAL STANDARD ISO 21782-2:2019(E)
Electrically propelled road vehicles — Test specification
for electric propulsion components —
Part 2:
Performance testing of the motor system
1 Scope
This document specifies the performance tests 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, Electrically propelled road vehicles — Test specification for electric propulsion components
— Part 1: General test conditions and definitions
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 Abbreviated terms
For the purposes of this document, the abbreviated terms given in ISO 21782-1 apply.
5 Tests
5.1 Measurement of total loss and total efficiency
5.1.1 General
Under the conditions of the paired inverter and motor combination, this test measures total loss and
total efficiency between the input power of the inverter and the output power of the motor in order to
ensure that the performance of the motor system is as designed.
5.1.2 Test diagram
The test diagram is shown in Figure 1.
Key
1 DUT
2 test motor
3 test inverter
4 DC power supply
5 load
6 torque/speed detector
7 spectrum analyser/power meter
8 torque/speed meter
9 inverter input current (in A)
10 inverter input voltage (in V)
11 motor torque (in Nm)
-1
12 motor speed (in min )
Figure 1 — Diagram for total loss and total efficiency test of the motor system
5.1.3 Test conditions
The test conditions are shown in Table 1.
Table 1 — Conditions for total loss and total efficiency test of the motor system
Test conditions Value Remark
DC input voltage Rated voltage as defined in ISO 21782-1:2019, 3.22. For the DC input voltage toler-
ance, see ISO 21782-1:2019, 5.3.
Ambient conditions Room temperature (RT) and humidity as defined in
ISO 21782-1:2019, 5.4.
Coolant temperature Maximum temperature for unlimited operating — In case of liquid cooling
capability
— Ethylene glycol and pro-
pylene glycol as examples of
coolant
— If technically feasible, the
tests shall be performed at
coolant temperature of 65 °C.
Otherwise the deviation shall
be documented in the test
report.
Coolant flow rate Minimum flow rate for unlimited operating capability In case of liquid cooling
Cooling air flow rate Minimum flow rate for unlimited operating capability In case of air cooling
2 © ISO 2019 – All rights reserved

Table 1 (continued)
Test conditions Value Remark
Operating point Test points as defined in ISO 21782-1:2019, Figure 1
— "a", "a’", "b", "p " to "p " (optional "e", "e’", "f", "p ’"
1 10 1
to "p ’")
Operating time — The operating points "a", "a’", "p ", "p ", "p ", "p ", For regenerative operating
1 3 5 7
"p ", "p ": 2 s, 10 s (optional 30 s, 60 s) points, the same operating
9 10
time applies as for correspond-
— The operating point "b": 1 800 s
ing motoring operating points.
— The operating points "p ", "p ", "p ", "p ": 1 800 s or
2 4 6 8
maximum allowable time for temperature protection
Measuring time Average of the last one second
5.1.4 Test procedure
If technically feasible the cooling flow path should be connected between inverter and motor and the
coolant should flow from inverter to motor and the tests shall be performed at coolant temperature of
65 °C. Otherwise the cooling configuration and/or temperature deviation shall be documented in the
test report.
Under specified operating points, the input power and the output torque and speed of motor shall be
measured. Inverter input power, motor output torque and speed shall be recorded. Each average of the
last one second of the records shall be used.
The total loss and total efficiency shall be calculated by using Formulae (1) and (2):
PP=− P (1)
sl ii mo
P
mo
η =×100 (2)
s
P
ii
where
P is the total loss of the motor system (in W);
sl
P is the inverter input power (in W);
ii
P is the motor output power (in W);
mo
η is the total efficiency of the motor system (in %).
s
5.2 Temperature rise test
5.2.1 General
Under the conditions of the paired inverter and motor combination, this test investigates the
temperature rise characteristics of each part of the motor system within the specified range in order to
ensure that the performance of the motor system is as designed.
5.2.2 Test diagram
The test diagram is shown in Figure 2.
Key
1 DUT
2 test motor
3 test inverter
4 DC power supply
5 load
6 torque/speed detector
7 thermometer
8 torque/speed meter
9 measurement point of temperature (in °C)
10 motor torque (in Nm)
-1
11 motor speed (in min )
Figure 2 — Diagram for temperature rise test of the motor system
5.2.3 Test conditions
The test condit
...