QC/T 1082-2017Electric motors for automotive electric power steering (English PDF)

3.6 Moment of inertia, J

A measure of the inertia (the characteristic that a rotating object maintains its uniform circular motion or stationary) as the rotating member rotates about the axis.

4.1 General requirements

4.1.1 Motor

The motor is manufactured in accordance with the product drawings and technical documents as approved by the prescribed procedures.

4.1.2 Working temperature

The motor shall be able to operate normally within the temperature range of -40 °C ~ +85 °C or +105 °C (the motor for electric power steering is installed outside the cab).

4.1.3 Relative humidity

The relative humidity that the motor can withstand shall be <= 95% RH.

4.1.4 Working voltage

4.1.4.2 Allowable voltage variation range

a) 10.8 V ~ 16 VC (nominal voltage 12 V);

b) 21.6 V ~ 32 V (nominal voltage 24 V).

4.1.5 Direction of rotation of motor

Clockwise and counterclockwise alternate in both directions.

4.1.6 The motor is a short-time working system

According to the provisions of GB 755, The S2 is 3 min.

4.1.7 Requirements of testing instruments and equipment

4.1.7.1 Within the temperature range of 23 °C ± 5 °C, the measurement accuracy of the torque, force, speed, current, voltage shall not be less than 0.5% […]

4.2.5 Insulation's withstanding voltage performance and insulation resistance

4.2.5.1 Insulation's withstanding voltage performance

The motor is not allowed to have spark flashing or breakdown.

4.2.5.2 Insulation resistance

At room temperature, the insulation resistance between the lead wire of the motor and the casing shall be >= 50 Mohm. After the combined temperature/humidity cyclic test, the insulation resistance between the lead wire of the motor and the casing shall be >= 1 Mohm.

4.2.6 Static friction torque and fluctuations

The static friction torque and fluctuation of the motor shall meet the manufacturer's requirements.

4.3 Environment

4.3.1 Temperature shock

After the test, the motor shall be able to work normally and shall meet the requirements of 4.2.1.

4.3.2 Combined temperature/humidity cycle

After the test, the motor shall be able to work normally and shall meet the requirements of 4.2.1.

4.3.3 Corrosion resistance

4.3.3.1 After the corrosion resistance test, the motor shall be able to work normally and shall meet the requirements of 4.2.1.

4.3.3.2 The area of white spot of surface corrosion shall not exceed 20%. It does not allow for red rust spots (only the exposed parts of the motor and device after assembly are evaluated).

4.3.3.3 The surface protection layer shall meet the requirements of TQ6 in QC/T 484.

4.3.4 Dustproof and waterproof

When the motor is installed outside the cab, the motor (only the exposed parts of the motor and the device after assembly are evaluated) shall meet the requirements for dustproof and waterproof. The degree of protection shall reach IP65.

4.4 Durability and mechanical strength

4.4.1 Durability (environmental operating life)

4.4.1.1 After the motor is subjected to durability test, it shall meet the requirements of 4.2.1.

4.4.1.2 The change of noise after the test shall be <= 30%.

4.4.2 Vibration

4.4.2.1 After the motor is subjected to vibration test, it is not allowed to have visible crack or fracture.

4.4.2.2 It shall meet the requirements of 4.2.1.

5.1 Test conditions

5.1.1 Temperature deviation

This standard specifies that the temperature deviation in the test method shall be ± 2 °C, unless otherwise specified.

5.1.2 Test voltage

This standard specifies a test voltage of 12 V ± 0.5 V (nominal voltage 12 V) or 24 V ± 1 V (nominal voltage 24 V), unless otherwise specified.

5.1.3 DC power supply for test

It may use the automotive battery or otherwise the DC regulated power supply which has a parallel ripple coefficient <= 0.5%.

5.1.4 Installation of motor

The motor is mounted flat on the test bench, unless otherwise specified.

5.2 Performance

5.2.1 Basic performance of motor

5.2.1.1 After the motor is powered on, apply the rated voltage. Measure the unloaded speed n0 and the unloaded current I0.

5.2.1.2 After the motor is powered on, apply the rated voltage and set the rated […]