The AC motor is equipped with a ratio generator (sensor for speed detection) installed at the tail of the motor.

Control Method of AC Speed Regulating Motor

A summary of the basic construction diagram and control methods is shown below.

The AC variable speed motor adopts a closed-loop speed control method.

① The speed setting voltage is provided by the speed setter.

② The ratio generator detects the motor speed and outputs the difference in speed signal voltage.

③ The difference between the output speed setting voltage and the speed signal voltage.

④ To achieve the set voltage, the voltage output from the comparison amplifier is provided to the motor.