On Jun 23, 9:49*am, jamesgangnc wrote:
On Jun 23, 9:45*am, Jim Yanik wrote:





"Rich." wrote :

On Jun 21, 12:50 am, Martin Levac wrote:
On 6/20/2011 10:55 PM, JIMMIE wrote:

On Jun 20, 5:21 pm, Martin wrote:
Hello,

I have a Lasko 2155A window fan with integrated 3 speed control
unit (links at the end of this post). I want to be able to fine
tune the speed so I want a fully variable speed control unit that
I would attach to the power cord, and control the speed from there
instead.

Just set your internal fan switch to high and use one of these:
http://www.harborfreight.com/router-...rol-43060.html

or wire an incandescent lamp dimmer to a duplex outlet,then plug in the
fan(on high range).
That's how I speed control my fixed speed model 270 Dremel Mototool.

--
Jim Yanik
jyanik
at
localnet
dot com- Hide quoted text -

- Show quoted text -

Again. *Your dremel is a brushed motor, not an induction motor. *What
works for a motor with brushes doesn't work on induction motors.- Hide quoted text -

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For those that don't understand induction motors. An induction motor
is both a trasnformer and a motor. It's really a clever idea that
recognizes that both motors and transformers are made of two coils.
The speed of the rotor is important in an induction motor so speeds
are controlled by the design of the motor. That's why multiple speed
induction motors have mutliple sets of stator windings. Which winding
you energize determines the speed. And also why messing aorund with
the voltage, particularly with controls that simply clip the sine wave
doesn't work very well. You can vary the speed by changing the
frequency. But only to a point because low frequencies don't work so
well with a transformer.