QC/T 1069-2017Permanent magnet synchronous drive motor systems for electric vehicles (English PDF)

3.4 No-load loss of drive motor system

the power consumed by the drive motor system when the drive motor runs at a specified speed and no torque is output

3.5 No-load loss of motor

the power consumed when all the windings of the drive motor are open and dragged at the specified speed

3.6 Steady state short-circuit current

the rms current when all motor windings of the drive motor are short-circuited and are dragged at the specified speed

3.9 Declared value of steady state short-circuit current

average value of steady-state short-circuit current of at least 4 drive motors (2 of them have been subject to the type inspection) at specified speed and permanent magnet temperature

4.1 General

The drive motor system shall meet the requirements of GB/T 18488.1-2015 and the followings.

4.4 Tolerance of no-load back electromotive force

The deviation between the back electromotive force and the typical value at rated speed shall not exceed ±5% between the drive motors of the same specification and model.

4.5 Cogging torque

The cogging torque shall not exceed the value specified in the product specification.

4.6 Torque ripple

The torque ripple shall not exceed the value specified in the product specification.

4.9 Steady-state short-circuit current limit

The steady-state short-circuit current shall not exceed the value specified in the product specification.

4.10 Steady-state short-circuit current tolerance

The difference between the steady-state short-circuit current measured at the specified speed and the typical value is not more than ±5% between the drive motors of the same specification type.

5.1 General

Except for the test methods specified below, the test methods for other test items shall be implemented in accordance with GB/T 18488.2-2015.

Unless otherwise specified, the accuracy requirements of measuring instruments shall be in accordance with GB/T 18488.2-2015.

5.4 Tolerance of no-load back electromotive force

The test is performed under the actual cold condition and the ambient temperature during the test must be recorded.

5.5 Cogging torque

The test is conducted in the actual cold state.

Place the drive motor smoothly and randomly select 3 different rotor positions.

Rotate the rotor in opposite directions with torque wrench at each position.

5.7 No-load loss of drive motor system

The test is conducted in the actual cold state. When the drive motor system is under normal electrical connection and cooling conditions specified in the product technical documentation, the rated voltage is applied on the DC bus and the drive motor shaft is not connected to the load.

5.8 No-load loss of motor

The test is conducted in the actual cold state.

Drag the drive motor to the specified speed. Record the torque, speed and power of the torque and speed sensor. The power value is the no-load loss of the drive motor at this speed. Evenly take at least 5 speed points within the speed range, including the maximum operating speed.

5.9 Steady-state short-circuit current limit

The test is conducted in the actual cold state.

Use short-circuit conductors to short-circuit all windings of the drive motor as close to the stator winding outlet as possible.

5.10 Steady-state short-circuit current tolerance

The test method is same with 5.9.