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I really don't know the specifics. But, AC power is a sine wave, not a square wave like PWMed DC power. An AC motor is designed to use this smooth wave, not a square wave. Converting to DC power sounds like a huge pain. Any efficiency gain wouldn't be worth the trouble I can gaurentee you. Its not like AC motors are horrible inefficient.
I'm also unsure why you want to PWM your fans? Its not going to increase efficiency or anything, its just going to slow them down...
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