The main reason for the breakdown of the electric motor insulation is that the surge voltage generated by the resonance of the capacitors and inductors distributed on the output line is superimposed on the output voltage, or the high switching frequency and long wiring of the transistors and IGBTs have a great impact, up to twice the DC voltage.
Solutions to the breakdown of the motor insulation:
1. Use a motor with high insulation strength.
2. Add an AC motor output choke (impedance is 3%).
3. Add output inductance L, capacitor C, and resistor R filter.
4. If there is an insulation problem, the problem will appear in a short time.
How to test whether the insulation of the Simo motor is broken down? Use a 1000 volt voltage shaker. If it is broken down, the insulation resistance is zero. Check the cable line regularly and eliminate hidden dangers in time. The cable line should not be overloaded for a long time, and the operating procedures should be followed.