PWM speed regulation of motor is usually realized by adjusting duty ratio. Duty cycle refers to the ratio of the duration of high level in one cycle to the whole cycle of PWM signal. The larger the duty cycle, the longer the duration of high level, the more driving energy the motor gets, and the higher the speed and torque of the motor.

PWM speed adjustment can be realized by the following steps:

Set the frequency of PWM signal: Generally, the higher the frequency of PWM signal, the faster the response speed of the motor, but it will also increase the noise and cost of the system. Therefore, it is necessary to choose the appropriate frequency according to the actual demand.

Adjust the duty cycle: By adjusting the duty cycle, the driving energy obtained by the motor can be controlled, so as to achieve the purpose of speed regulation.

Control the power supply voltage of the motor: In some applications, the speed of the motor can be adjusted by controlling the power supply voltage of the motor. For example, the adjustable power supply can be used to adjust the power supply voltage of the motor, so as to realize speed regulation.