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Speed control of exhaust fan
- 07-13-2006

Re: Speed control of exhaust fan

**Assuming the motor is a synchronous type, your chances are limited. PA's
idea of a VariacT is ideal, but expensive and bulky. I know people who have
put a lamp in parallel with the motor and used a standard light dimmer. I
can't guarantee the results, but it should work. Another good way is to
place the motor in series with a bridge rectifier (and the mains supply).
Across the DC connections of the bridge, connect a MOSFET (suitable rated
and heat sinked, of course) and vary the Gate Volts to get speed control
that way. The advantage is the motor can be varied over a very wide range.
--
Trevor Wilson
www.rageaudio.com.au
Trevor Wilson
www.rageaudio.com.au
--

Re: Speed control of exhaust fan
On Thu, 13 Jul 2006 10:02:00 GMT, "Brian Goldsmith."

All domestic mains powered exhaust fans I have ever seen use a simple
shaded pole AC motor.
I think a synchronous motor would be a bit over the top for an exhaust
fan :)
http://en.wikipedia.org/wiki/Shaded_pole_motor
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