> "Practical point" and number of "millions of DC motors
> run on PWM" may not get a justification, when motor coil
> isolation crashed under high frequency PWM voltage, for
> example. Well, maybe it crashed for different reason, but
> it's hard to prove, and all the guilt may be laid down
> on a developer who set a motor out of spec.

OK, I'll accept that. If it could be proven that a particular
method of driving the motor caused premature failures
then obviously it's the wrong type of drive. If however you
have to do a post mortem looking for "probable" cause
of death in isolated cases then I think you'd be drawing a
long bow to make a generalisation about PWM being
harmful

> Lawyers sometimes are not as honest as one may imagine :-)

You mean they could more honest ?

> Mike.

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