Shaded Pole Fan Motor - Speed Control Question

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Joined:Mon Feb 20, 2017 11:09 am
Shaded Pole Fan Motor - Speed Control Question

Post by Eugene » Wed Mar 08, 2017 9:48 am

Hi, I'm new here.

We have an oven with a shaded pole AC fan motor - 120VAC, 40W, 3K rpm (the inserted photo is very similar). Since the oven manufacturer cheaped out big time, the plastic fan wobbles badly, generating a very loud vibration noise. I'd like to slow the fan down. I figure that 50-75% speed will eliminate the noise while still providing the cooling the oven requires. I tried a ceiling fan speed control, presumably triac based, but it works too well, slowing down to about 25% speed. While messing with that, I discovered that the fan slows way down when my bench vise jaws clasp the magnetized stator. Further experimentation revealed that any sizable ferrous metal also slows it down. I'm sure I can find just the right size to bring the rpm down to the range I want.

My question is: Will the shaded pole motor be happy with this chunk of metal attached, or will it overheat or otherwise fail?

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