I suspect it has to do with the ability of the core to react to the
particular exciting frequency.
There must be permiability changes with frequency.

Thomas N wrote:

> Hi everyone,
>
> I am using PWM to control the speed of a 4.5V DC motor.  Would you please
> tell me at what frequency I should set the PWM to run at?  What are the
> advantages/disadvantages for low and high PWM frequency?
>
> Thank you very much!
> Thomas
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