With the increasingly mature and perfect technology of brushless DC motors in my country, and restricted by the national energy consumption policy, traditional AC induction motors are difficult to meet market demand, so the production capacity of brushless DC motors has been developed rapidly. Medical equipment, household appliances, electric vehicles, etc. are widely used in many fields; structurally, DC brushless motors also have rotors and stators. The rotor of brushless motors is permanent magnet steel, and the stator is winding coils. The structure is a three-phase star Or triangular; DC brushless motors are generally divided into two structures: built-in drive board and external drive board.

This article focuses on the test items of the brushless motor stator:

1. AC Hi-pot: When each phase line is short-circuited, a certain amplitude of AC high voltage is applied between E (motor shaft/end cover/housing) to detect whether the loop current exceeds the preset value.

2. Insulation resistance: When each phase line is short-circuited, a certain amplitude of DC high voltage is applied between E (motor shaft/end cover/housing) to detect whether the circuit insulation resistance is a low-voltage preset value.

3. Coil resistance: A constant DC signal is applied at both ends of the winding to measure the temperature and winding resistance in the current environment, and convert it to the resistance value at the specified temperature (20°C or 25°C), which can judge the degree of resistance imbalance.

4. Surge: Impulse voltage with a specific amplitude and waveform is applied to both ends of the winding, and the oscillation waveform is compared with the standard waveform to compare the degree of difference between the waveforms.

5. Coil inductance: apply a very low AC voltage signal at both ends of the stator winding, such as 0.3V or 0.6V, or 1V, the more commonly used is 0.6V; the frequency is 100Hz or 120Hz or 1KHz, or 10KHz; at this time, the instrument collects the current signal, the inductance value can be measured by calculation.

6. Rotation: Use the sensor to identify whether the steering is correct inside the stator, and it is used to detect bad wire welding or winding.

AIP focuses on global motor testing. It exported brushless testing tester in 2013. After continuous technology research and development and precipitation, it has achieved many breakthroughs in the field of brushless motor testing. It has cooperated with Welling Group, Kaibang Group, Dayang Group, etc. Large-scale motor manufacturing enterprises have cooperated with multiple batches of brushless orders, and have been highly praised by customers.

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