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AC speed control: shaded pole motor

Discussion in 'Electronic Basics' started by [email protected], Dec 22, 2006.

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  1. Guest

    Let's say I have a shaded pole motor, which controls a blower fan
    (basically a bathroom vent fan).

    Let's say I have a 12VDC car battery, and a 12V-120V step-up

    Would it be practical to power (and control the speed of) the motor by
    having a microcontroller produce PWM square waves?

    Or is there a better way to control the speed of the motor...?

    Why the 12V: I suppose I *could* take a bridge rectifier, hook it up
    to AC mains, then figure out some way to power the motor (what is it,
    170V peak here in the US) with the PWM scheme, but since I'm a
    beginner, first things first... low power for now.


  2. To what point?
  3. jasen

    jasen Guest

    a commercial fan speed comntroller, switched series capacitors...
    after the planned step-up it won't be 12V any more...

    if you want to do it with 12V use a 12V motor (like a computer fan) and
    modify that (PWMing the 12V supply might be enough)

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