PWM Motor Speed Control

To control the motor speed, there are DC speed control and AC speed control if PWM is used.

DC PWM motor speed control is to change the equivalent output voltage by changing the duty cycle of the output square wave. When the duty cycle of PWM decreases, the effective value of the output voltage decreases, i.e., the motor speed slows down, and vice versa.

AC PWM motor control speed, the use of SPWM is based on PWM modulation pulse modulation mode, pulse width time duty cycle according to the sinusoidal law, so that the output waveform after appropriate filtering can do sine wave output, to control the speed of the motor.

Why is PWM used to control motors?

Mainly using PWM method is more efficient and convenient