William Chops Westfield wrote:
> On Jul 25, 2008, at 7:17 PM, Apptech wrote:
>
>   
>> This may not be a problem, depending on your application. In
>> a few applications it may even be an advantage if it adds
>> techo-appeal to your product.
>>     
>
> There's some micro-RC gear (ie blimps) that use the motor windings
> as a sort of speaker for audio feedback of configuration status.
> Very clever...
>
> BillW
>
>   
Actually most hobby brushless motor controllers do this,
Some even play "music" when they are turned on.
This is up to 3Kw in size, they also typically PWM at ~3Khz

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