GBT 18488.2-2015 Drive motor system for electric vehicles Part 2: Test method for cold DC resistance measurement of stator winding of drive motor

一、general provision (law)
Article 5.6 drive motor stator winding cold DC resistance should be measured in the actual cold state, and record the ambient temperature value at the time of measurement.

Article 5.6.1 Measurement of ambient temperature

Article 5.6.2 Measurement of DC resistance of windings

二、Summary of Test Methods
The standard specifies the measurement with microohmmeter, the measurement of the drive motor is stationary, from the winding of each phase of each branch of the beginning and end of the lead, respectively, the measurement of each phase of each branch of the DC resistance, and then calculate the DC resistance of each phase. When measuring, the test current through the winding should not exceed 10% of its rated current, and the energizing time should not exceed 1 minute.