1, from the point of view of power frequency, frequency conversion motor is inferior motor, ordinary motor is a good motor;2. Because the PWM width modulation wave output by the frequency converter mimics sinusoidal alternating current, which contains a lot of harmonics, it generally needs to be fil

1, from the point of view of power frequency, frequency conversion motor is inferior motor, ordinary motor is a good motor;2. Because the PWM width modulation wave output by the frequency converter mimics sinusoidal alternating current, which contains a lot of harmonics, it generally needs to be fil