> I am not using a transformer, I'm using our mains supply which is
220VAC...
>
> Question: Will the very nature of PWM on the motor not cause the average
> voltage to drop below the accepted range in any case? Then I just have to
> make sure I don't switch the motor on at 100% duty cycle.

It depends on what the limiting factor of the high voltage spec is.  If it
is based on dielectric strength or arc distance, then you can't do what you
are thinking.  If it is to prevent the motor from drawing too much current
and therefore heating up too much (this is more likely), then you can
compensate with PWM that never exceeds a certain duty cycle.


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