When using PWM is there a lower limit for the pulse repetiton frequency? The 4QD site suggests 20KHz is probably the optimum and ideally the period should be shorter than the L/R time constant of the motor. But I seem to recall a small AC/DC motor being driven by a mains frequency lamp dimmer.
I want to control one from a PIC where the minimum PW would be 8ms.
If you overload a motor it will run at a slow speed. It will smoke and burn. But if you have a reasonable load then slow it with PWM it will be fine. It receives less power when PWM reduces its average power. Less power is less heat.
PWM speed control of DC motor
Posted - Dec 01 2009 : 4:04:13 PM
