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At what frequency should an H-Bridge be turned on and off to control a DC motor?
I'm trying to use an H-Bridge to control a DC motor, and it works fine going full speed in either direction, but I would like to use a PWM signal on the enable pin to vary the speed of the motor. But what I don't know is what frequency this should be done at?
Thanks!
In general, the lower the frequency the better. High frequencies (15-50kHz) have switching times which are a greater percentage of the pulse width, and transient ringing is more troublesome.
I'd start about 100Hz...my personal goal is as low as possible without generating acoustic noise due to lamination vibration at slow speeds (i.e., narrow ON pulse width).
If you get noise here, go up a little at a time until the noise is gone at the lowest desired speed.
This would be my personal approach to a generic speed control.
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