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Tool Talk Discussion Forum

Re: Variable Speed Fan Question

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Author  [Modern View]
missouri massey man

03-01-2013 11:58:53

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Does the "mushroom" fan you are planning on using have a gray metal oval capacitor (or gray plastic oval) attached to the side of the motor? Or is it a belt drive motor with the same style capacitor?? If so, these motor will be what is called a "Permanent Split Capacitor" (PSC) motor and can be varied in speed with nothing more that a wall mount rheostat or speed controller. Check WWGrainger to locate. These motors do not have a centrifugal switch nor do they have a start winding that is required to be removed from the circuit. The gray oval "run" capacitor stays in the circuit continuously and limits the amount of current through the start winding after start-up.

The fact that a capacitor is on the motor reflects that it is a single phase motor, but if it were in fact a three phase motor, it could be run safely on single phase by powering it with a vfd and will allow it to operate at infinite rpm from 0 to the maximum rpm rating of the motor.
If it has a black plastic (bakelite) round (tubular) capacitor, that would indicate a "capacitor start" motor and would have a centrifugal switch internally. These types of Greenheck, Carnes, etc aluminum mushroom ventilators when set up for single phase have the PSC motors, whether belt drive or direct drive.

Hopefully this is helpful info, not too boring and not too long of a reply......

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