Hello I used to be able to purchase a 24 volt AC rotary speed controller for some small fan coils I supply. These fan coils draw up to 2 amps. The manufacturer in the US seems to have gone out of business. Does anyone have an idea where I may be able to get this type of switch. Rotary is preferred, but I will try most anything. Thank You, Jim
24 Volt AC speed controller or dimmer switch
Dec 20, 2007
2 Replies
There are several ways to control the speed of an AC motor. It depends on th specific type of motor, quality, output speed torque... Here is a link to a basic (cheap) one made by Dart Controls. You may also want to check Baldor, or Bodine. They make small motors and may have controls. Other big catalog distributors to check with are Allied Electronics, or Newark. Both have pretty good web sites to search for this type of control.
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The basic schematic on this site works well. 0-30 volts 0-10 amps
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Potentiometer SCR Throttle Schematic is the one you want.
The other circuits try to emulate mass and inertia to give realism to the model trains they control - and are lots more complicated.
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