How to do no-load test after repairing three-phase asynchronous motor?

The purpose of the no-load test of the repaired three-phase asynchronous motor is to check the assembly quality of the motor; Core quality; Vibration and noise of motor; Measuring no-load loss; No-load current and its balance, etc. How to do it specifically, follow Xiaobian to see.

First, the no-load test method of motor

1, the motor idling for 20-60 minutes, the purpose is to make the mechanical loss reach a stable state, after everything is normal, step up to the rated voltage;

2. During the test, record the voltage (U0), phase current (I0), power (P0) and revolutions of each phase;

3. The difference between the no-load current and the average current of any phase shall not be greater than 10%; Compared with the factory test, the no-load current and no-load loss shall not exceed 10%;

4. The balance test conforms to the standard of GB10068.1-88;

5, no-load characteristic curve test.

Second, the motor no-load test matters needing attention

1, the power waveform distortion should not exceed 5%;

2. Dalan motor manufacturer reminds you that the indicated values of all instruments should be read out at the same time to prevent reading errors;

3. The high-voltage motor can be tested with low-voltage power supply, and then converted to rated value after the test.