How do you think the air compressor is frequency conversion

The simplest point is to see whether it contains a frequency converter, and the second is to see whether the motor changes its speed according to the actual working conditions during operation.

There are nameplates on the air compressor. You can see the nameplates.

Look at the rated speed on the nameplate of the motor.

The three-phase AC permanent magnet variable frequency motor is a synchronous motor.

Ordinary is a three-phase AC asynchronous motor, there is a certain slip rate.