GB/T 18488-2024Drive motor systems for electric vehicles (English PDF)

3.1 Drive motor

An electrical device that converts electrical energy into mechanical energy to provide driving force for the vehicle. This device also has the function of converting mechanical energy into electrical energy. [source: GB/T 19596-2017, Definition 3.2.1.1.2.1, modified]

3.2 Drive motor controller

A device that controls the transmission of energy between a power source and a drive motor.

NOTE: it consists of control signal interface circuit, drive motor control circuit, drive circuit and power electronic module, etc. [source: GB/T 19596-2017, Definition 3.2.1.2, modified]

3.3 Drive motor system

A system installed on electric vehicles to provide driving force for vehicle driving and realize the mutual conversion between mechanical energy and electrical energy.

NOTE: it includes drive motor, drive motor controller and auxiliary devices necessary for their operation. The auxiliary devices include transmission device integrated with the drive motor. [source: GB/T 19596-2017, Definition 3.1.2.1.10, modified]

5.1 General Items

5.1.1 General requirements

The drive motor system shall be flexibly idling, without abnormal noise (such as: friction between the stator and rotor, periodic abnormal noise, abnormal noise after bearing damage, and abnormal noise caused by tiny foreign objects stuck in the rotating parts, etc.) or jamming.

5.1.2 Appearance

5.1.2.1 The outer surface of the drive motor system shall have no obvious damage or deformation, and the coating shall not peel off.

5.1.2.2 If a nameplate is installed, the nameplate of the drive motor system shall be squarely and firmly installed, with clear writing.

5.1.2.3 The lead wires or terminals of the drive motor system shall be intact, and the fastener connections shall not be loose.

5.1.2.4 The drive motor and drive motor controller shall satisfy the requirements of 5.1.2.1 ~ 5.1.2.3.

6.1 Test Preparation

6.1.1 Test environmental conditions

Unless otherwise specified, all tests shall be conducted under the following environmental conditions:

a) Temperature: 18 °C ~ 28 °C;

b) Relative humidity: 10% ~ 90%;

c) Atmospheric pressure: 86 kPa ~ 106 kPa.

6.1.2 Selection of test instruments

6.1.2.1 Instrument accuracy

The accuracy or error of the instrument shall not be lower than the requirements of Table 3 and shall satisfy the accuracy requirements of the actual measured parameters. Especially for electrical parameter measurement instruments, they shall be able to satisfy the accuracy and waveform requirements of the corresponding DC parameter and AC parameter measurement.

6.1.2.2 Error of measurement process

The requirements for the error between the control value (actual value) and the target value are as follows:

a) Voltage: when it is not greater than 250 V, the error shall be ± 2.5 V; when it is greater than 250 V, the error shall be ± 1%.

b) Current: ± 1%.

c) Temperature: ± 2 °C.

d) Flow rate: ± 0.5 L/min.

7.1 Consistency Inspection

7.1.1 The drive motor system shall undergo consistency inspection under one of the following conditions: The inspection items shall comply with the stipulations of Appendix C.

a) When requested by the manufacturer's quality inspection department;

b) When the competent authority puts forward a request for consistency inspection.

7.1.2 The deviation between the measured input & output characteristic values and the corresponding declared values during type certification shall not exceed ± 5%.

7.2 Type Inspection

7.2.1 Under one of the following conditions, type inspection shall be carried out.

a) When new products or old products are transferred to factories for production;

b) After formal production, when there are major changes in structures, materials and processes that may affect the declared performance of the product;

c) When the production resumes after one year of suspension;

d) When there are significant differences between the exit-factory inspection results and the previous type inspection results.

7.2.2 Sample delivery

Take products that have passed the exit-factory inspection for type inspection. 2 sets of samples shall be delivered.

7.2.3 Inspection procedures

The inspection items and sample machine No. are as specified in Appendix C.

7.2.4 Evaluation of test results

7.2.4.1 Qualification

If all items of the sample machines used for type inspection comply with the requirements in the inspection, then, they shall be deemed qualified in the type inspection.

7.2.4.2 Disqualification

As long as one sample machine fails to comply with the requirements in any item in the inspection, then, they shall be deemed disqualified in the type inspection.

7.2.4.3 Performance degradation

After the sample machines were subjected to the environmental test, performance degradation that does not affect the use is allowed. The allowable value of performance degradation is specified in the product technical specifications.

8.1 Lead Wires and Terminals

The externally visible power lines or terminals of the drive motor system shall have obvious markings. The markings shall comply with the stipulations of GB/T 1971. The outer sheath of cables and wire harnesses shall comply with the stipulations of GB 18384. The positive and negative poles of the DC bus interface of the drive motor system are respectively marked with "+" and "-". The power lines or power terminals of the drive motor controller corresponding to each phase of the drive motor shall be consistent with the markings of the power lines or terminals of each phase of the drive motor.

8.2 Nameplate of Drive Motor

The nameplate of the drive motor should include the following information:

a) Manufacturer's name;

b) Model, serial No. and name;

c) Main parameters: working voltage range, continuous power, peak torque and duration, peak power and duration, maximum working speed, insulation level and protection level.

8.3 Nameplate of Drive Motor Controller

The nameplate of the drive motor controller should include the following information:

a) Manufacturer's name;

b) Model, serial No. and name;

c) Main parameters: working voltage range and protection level.

8.4 Nameplate of Integrated Drive Motor System

8.4.1 The nameplate of the integrated drive motor system should include the following information:

a) Manufacturer's name;

b) Model, serial No. and name;

c) Main parameters: working voltage range, continuous power, peak torque, peak power, maximum working speed, insulation level, protection level and transmission ratio.

8.4.2 The integrated drive motor system may choose to have separate nameplates for the drive motor and the drive motor controller or use a single nameplate.

8.4.3 If the drive motor system with a transmission device has multiple speed ratios, they should be respectively listed and separated by slashes, for example, 10/11/12.

8.5 Warning against Danger

For the drive motor system whose DC bus voltage is Class B voltage, high-voltage warning signs should be set in conspicuous locations on the components in accordance with the stipulations of GB 18384.

A.1 Model Naming of Drive Motors

A.1.1 Model composition of drive motors

The drive motor model consists of five parts: drive motor type code, size specification code, signal feedback element code, cooling mode code and reserved code.

The type code of other types of drive motors is QT or specified by the manufacturer with reference to GB/T 4831. […]