GB/T 29307-2022 PDF English
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Reliability test methods of drive motor system for electric vehicles
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GB/T 29307-2022: Reliability test methods of drive motor system for electric vehicles---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT29307-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.120
CCS T 47
Replacing GB/T 29307-2012
Reliability Test Methods of Drive Motor System for Electric
Vehicles
Issued on: DECEMBER 30, 2022
Implemented on: JULY 01, 2023
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Terms and Definitions... 5
4 Test Conditions... 6
4.1 General requirements... 6
4.2 Cooling... 6
5 Test Procedures... 7
5.1 Preparation before the test... 7
5.2 Preliminary test of the performance... 7
5.3 Reliability test... 7
5.4 Performance retest... 7
6 Test Methods... 7
6.1 Test sample... 7
6.2 Speed up and down cycle... 8
6.3 Torque load cycle... 9
7 Inspection and Maintenance... 11
7.1 General requirements... 11
7.2 Inspection at any time... 11
7.3 Inspection every hour... 11
7.4 Inspection every 24 hours... 11
7.5 Handling of failure and Shutdown... 11
8 Processing of Test Result... 12
9 Reliability Assessment... 12
10 Test Report... 14
Appendix A (Informative) Recommended Principles for Reliability Test Cycle Times
... 15
Bibliography... 16
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for
Standardization – Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This Document replaced GB/T 29307-2012 The Reliability Test Methods of Drive Motor System
for Electric Vehicles. Compared with GB/T 29307-2012, the major technical changes of this
Documents are as follows besides the structural adjustments and editorial modifications.
a) Modify the scope; and add the provisions for special machine models to be implemented
by reference (see Clause 1 of this Edition; Clause 1 of 2012 Edition);
b) Modify the term and definition of continuous torque; delete the terms and definitions of
maximum operating speed and peak power; and add the terms and definitions of rated
speed and rated voltage (see Clause 3 of this Edition; Clause 3 of 2012 Edition);
c) Delete the requirements for the test power supply; and add the cooling requirements for
the oil-cooled drive motor system (see Clause 4 of this Edition; Clause 4 of 2012 Edition);
d) Add the running-in requirements before the test when the drive motor system under test
includes a reducer (see 5.1.3 of this Edition);
e) Modify the test items of the preliminary test and retest of performance (see 5.2 of this
Edition; 5.2 of 2012 Edition);
f) Modify the reliability test specification; and the test item has been changed from one item
of torque load cycle to two reliability tests of speed up and down cycle and torque load
cycle (see Clause 6 of this Edition; Clause 6 of 2012 Edition);
g) Modify the reliability assessment method (see Clause 9 of this Edition; Clause 9 of 2012
Edition).
Please note some contents of this Document may involve patents. The issuing agency of this
Document shall not assume the responsibility to identify these patents.
This Document was proposed by the Ministry of Industry and Information Technology of PRC.
This Document shall be under the jurisdiction of National Technical Committee of Auto
Standardization (SAC/TC 114).
Drafting organizations of this Document. China FAW Group Co., Ltd.; China Automotive
Technology and Research Center Co., Ltd.; China Automotive Research New Energy Vehicle
Inspection Center (Tianjin) Co., Ltd.; Beijing Institute of Technology; University of Shanghai
for Science and Technology; Huawei Digital Power Technology Co., Ltd.; Suzhou Inovance
Automotive Co., Ltd.; CRRC Electric Vehicle Co., Ltd.; Polar Krypton Automobile (Ningbo
Hangzhou Bay New Area) Co., Ltd.; NIO Automobile Technology (Anhui) Co., Ltd.; JEE
Power System Co., Ltd.; Toyota Motor (China) Investment Co., Ltd.; BYD Automobile
Industry Co., Ltd.; Chongqing Changan New Energy Vehicles Technology Co., Ltd.; Yutong
Bus Co., Ltd.; Zhejiang Fangyuan Checking Group Co., Ltd.; Wuxi Weifu High-Technology
Group Co., Ltd.; Beihang University; China Automotive Engineering Research Institute Co.,
Ltd.; Hefei Sungrow Electric Power Technology Co., Ltd.; Zhuhai Enpower Electric Co., Ltd.;
Ningbo Jiecheng Automobile Technology Co., Ltd.; and Beijing National New Energy Vehicle
Technology Innovation Center Co., Ltd.
Chief drafting staffs of this Document. Wang Sibo, Wang Dazhi, Cao Dongdong, Kong Zhiguo,
Song Qiang, Zhao Lihui, Wang Hao, Chu Wenqiang, Zhu Kunlun, Mao Ning, Wang Jiang, Liu
Houlin, Zhang Qian, Hu Lei, Du Changhong, Han Guanghui, Chen Feng, Xu Yunfeng, Wen
Yandong, Yang Shichun, Liu Hongxin, Du Quanhui, Li Chen, Zhao Huichao, Yuan Changrong,
Sun Qiang, Li Wenshuai, and Ma Yongzhi.
The historical editions replaced by this Document are as follows.
--- GB/T 29307-2012 was first-time published in 2012;
--- It is the first-time revised hereby.
Reliability Test Methods of Drive Motor System for Electric
Vehicles
1 Scope
This Document specifies the test conditions, test procedures, test methods, inspection and
maintenance, arrangement of test results, reliability evaluation and test report for bench
reliability tests of drive motor systems for electric vehicles.
This Document is applicable to the drive motor system for electric vehicles, and the vehicle
motor system with only auxiliary drive function or power generation function shall be
implemented as a reference.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 2900.13 Electrotechnical terminology - Dependability and quality of service
GB/T 18488.1 Drive motor system for electric vehicles - Part 1.Specification
GB/T 18488.2 Drive motor system for electric vehicles - Part 2.Test methods
GB/T 19596 Terminology of electric vehicles
QC/T 893 Failure Classification and Assessment of Electrical Machine System for Electric
Vehicle
QC/T 1022-2015 Technical specification for reduction gearbox of battery electric
passenger cars
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in GB/T 2900.13, GB/T
18488.1, GB/T 19596 and QC/T 893 apply.
3.1 Rated voltage
The nominal voltage value of the DC bus declared by the manufacturer.
3.2 Continuous torque
Under the conditions specified by the manufacturer, the maximum mechanical torque that the
drive motor system can work continuously for a long time.
3.3 Rated speed
Under the conditions specified by the manufacturer, the maximum speed at which the drive
motor system can output continuous torque.
4 Test Conditions
4.1 General requirements
4.1.1 The device under test shall be a drive motor system that complies with the provisions of
product technical documentation.
4.1.2 Unless otherwise specified, the test conditions shall meet the test preparation requirements
specified in GB/T 18488.2.
4.2 Cooling
The cooling equipment or cooling conditions during the test shall meet the following
requirements.
--- For the air-cooled drive motor system, the air-cooled motor in the actual loading shall be
included in the test process;
--- For the natural-cooled drive motor system, an external fan can be added to cool the drive
motor system;
--- For the liquid-cooled or oil-cooled drive motor system, the coolant or lubricating oil
specified by the manufacturer shall be used; and shall be replaced regularly during the
test according to the manufacturer's provisions;
--- The cooling conditions of the drive motor system shall simulate its actual use conditions
in the vehicle. The model of the drive motor system cooling device, the type of coolant,
the flow rate (or pressure) and the temperature shall be recorded in the test report.
5 Test Procedures
5.1 Preparation before the test
5.1.1 The connection line between the controller and the motor shall be consistent with the
actual vehicle, and the monitoring system shall be installed at the same time. In order to ensure
that the system can work normally, the necessary associated signals shall be simulated or
shielded by other methods.
5.1.2 The working status of power supply, test bench and monitoring system shall be normal.
5.1.3 When the drive motor system under test includes a reducer, it shall be run-in according to
the requirements of 6.2.3 in QC/T 1022-2015 or the manufacturer's provisions before the test;
and the lubricating oil shall be replaced after the run-in.
5.1.4 When the drive motor system under test includes a reducer, the setting of the preliminary
test of performance, performance retest and reliability test conditions shall be converted
according to the reduction ratio of the reducer.
6 Test Methods
6.1 Test sample
The reliability test in this Document consists of two parts, as shown in Table 1, and each part
shall be tested with separate samples a and b.
6.2 Speed up and down cycle
6.2.1 Speed up and down cycles shall be carried out according to Figure 1 and Table 2; and the
test voltage is the rated voltage.
6.2.2 The total number of test cycles shall be carried out in accordance with Table 3.The
manufacturer can select the number of cycles corresponding to the severity level in Table 3 for
the test according to the requirements of the product technical documents or the agreement with
the user, and state in the test report; the recommended rules for the number of the reliability test
cycles can refer to Appendix A.
6.3 Torque load cycle
6.3.1 The torque load cycle shall be carried out in accordance with Figure 2 and Table 4.
6.3.2 The total number of test cycles and the number of test cycles under each voltage contained
in it should be carried out in accordance with Table 5.The manufacturer can select the number
of cycles corresponding to the severity level in Table 5 for the test according to the requirements
of the product technical documents or the agreement with the user; and state in the test report.
6.3.3 When the drive motor system under test works at the upper and lower limit voltages at
full power, the test torque fluctuations caused by bus voltage fluctuations are allowed.
7 Inspection and Maintenance
7.1 General requirements
The inspection and maintenance shall be carried out in accordance with the requirements of
7.2~7.5; but the content and period may be appropriately increased or decreased; and the
inspection results and maintenance conditions shall be recorded in detail.
7.2 Inspection at any time
7.2.1 Use fault diagnostic devices, instruments, and computers to monitor the operating data at
any time. When the limit value is exceeded, an alarm or emergency shutdown will be issued,
and handling will be carried out according to the severity of the fault. If it belongs to the failure
of the drive motor system under test, it shall be regarded as a failure shutdown. Record
downtime, reasons and handling of failures.
7.2.2 Monitor the running sound of the drive motor system under test. When there is obvious
abnormal noise, stop the machine to check the fasteners, mechanical connectors and the state
of the drive motor system under test; check and confirm the noise source; and judge whether to
continue the test further according to the actual situations.
7.3 Inspection every hour
Record, in a timely manner within 1 hour, the torque and speed of the motor under test, the DC
bus voltage and current of the motor controller, cooling conditions, and the operating
temperature of the power components of the motor controller. If the motor is equipped with a
temperature sensor, check the working temperature of the motor windings together; and observe
and monitor through the temperature-time relationship curve. If the drive motor system under
test includes a reducer, the oil temperature of the reducer shall also be monitored and must not
exceed the maximum allowable temperature.
7.4 Inspection every 24 hours
7.4.1 It is allowed to stop for one time, inspect the test equipment, and check the fasteners,
mechanical connectors and pipelines, especially the hoses; and check the connecting cables and
interfaces.
7.4.2 Check the liquid level of the coolant, whether there is leakage in the cooling system circuit,
etc., and replenish the coolant when there is a shortage of liquid.
8 Processing of Test Result
8.1 Carry out failure records according to QC/T 893, and provide failure-related photos.
8.2 Based on the actual continuous running time (h) of the drive motor system under test and
the records during the running process, carry out the evaluation according to Clause 9.
9 Reliability Assessment
9.1 The manufacturer can choose to use the mean time to first failure (MTTFF), the number of
downtimes, the mean time between failures (MTBF) and the lower confidence limit (θL) of the
mean time between failures to carry out a reliability assessment.
The mean time to first failure (MTTFF) can be calculated by Formulas (1) and (2).
9.2 After the reliability test, the performance retest of the drive motor system shall meet the
following requirements.
--- Abnormal noise and bearing stagnation shall not occur during operation;
--- The insulation resistance value shall meet the relevant provisions of GB/T 18488.1;
--- Compared with the preliminary test of performance, the peak torque attenuation at rated
speed and maximum operating speed shall be no greater than 5%.
10 Test Report
The test report shall at least include the following.
a) foreword. explain the source of the test task;
b) test basis;
c) the purpose of the test;
d) test object. indicate the main parameters of the drive motor system under test, and attach
graphics, photos and necessary descriptions;
e) test equipment and instruments. the name, manufacturer, model, accuracy and other basic
parameters of the main equipment and instruments, as well as the effective date of
calibration and the measurement position shall be stated;
f) differences between test conditions and standards;
g) test results.
1) sorting out the original data should be represented by a curve, and important data can
be listed;
2) calculation results of reliability evaluation indicators;
3) failure and maintenance statistics;
4) adjustment and replacement records during the test;
5) performance test results.
h) conclusions and recommendations.
1) describe the mode, type and number of failures;
2) describe the mean time to first failure, the number of failure shutdowns and the mean
time between failures;
3) when necessary, according to the reliability test results, put forward suggestions for
improvement and supplementary tests.
i) test date.
Appendix A
(Informative)
Recommended Principles for Reliability Test Cycle Times
A.1 The number of test cycles for speed up and down cycles and torque load cycles should be
selected according to the design life of the drive motor system, as shown in Table A.1.
Table A.1 -- Recommended Principles for the Levels of the Number of Cycles
Design life Levels
Levels-1 million km and above A
Level-600 thousand km B
Level-300 thousand km C
A.2 The number of test samples for the speed up and down cycle and the torque load cycle is 1
set, respectively. If there are more specific requirements for the number of test samples, the
number of test cycles can be converted according to the relevant methods in Appendix B of
GB/T 28046.1-2011.
A.3 If the use conditions or configuration of the product are special, the manufacturer can also
select the number of cycles of the corresponding severity level for the test according to the
specific use conditions of the product or the agreement with the user.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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