The frequency converter is used for motor protection. As a result, there is no problem with the frequency converter, a small hole is burned in the motor rotor, and the weather is getting worse. Is it

The frequency converter is used for motor protection. As a result, there is no problem with the frequency converter, a small hole is burned in the motor rotor, and the weather is getting worse. Is it caused by the harmonic of frequency conversion? Judging from your description, it should be PWM wave output by frequency converter.

The output of the inverter is not a sine wave, so when we measure the output voltage of the inverter with a common multimeter, the results are very amazing, and some even can measure the output voltage as high as 1000 V, which is caused by the harmonics contained in PWM.

It is suggested to install an output filter of the frequency converter at the output end of the frequency converter, and a sine wave filter can be installed if conditions permit.

Lu Bojie hopes to help you!