Speed Control Motors/Brushless Motor Control Method of Inverters

The basic block diagrams and outline of the control methods are shown below.
Inverters employ an open loop speed control system.

[1]

Input from the AC power supply is rectified, and output as DC voltage.

[2]

A voltage signal led by the frequency set with the potentiometer for setting frequency is output.

[3]

The voltage of the set frequency is applied to the motor.