Is there a way to find out what frequency I need for PWM?

All QuestionsCategory: Electrical EngineeringIs there a way to find out what frequency I need for PWM?
Is there a way to find out what frequency I need for PWM?Brittany Williams asked 4 months ago
I have a 12v motor running at 60rpm or 1Hz. Do I need a PWM that matches the frequency for it to work? Most of the ones I’ve seen are around 25KHz for a 12V 20A motor.

1 Answers
Is there a way to find out what frequency I need for PWM?Ramadan Moghadam answered 4 months ago

No. You do not match cycles per second with PWM frequency. It should be much higher. You want enough height so that the motor runs smoothly (the motor’s inertia smooths the motion and the motor’s inductance helps cool the current), but not that the shunt losses are too high in your electronics to be excessive. Often at least 8-10 kHz, but you may want >20 kHz if audible noise is an issue. You have quite a bit of leeway before the frequency becomes completely “wrong”.

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