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What could make my antique table fan run backwards? Answered

I bought an antique hunter table fan at an auction. The power cord was missing so I replaced it. When I turn it on now it runs but it sucks air rather than blowing it. Can anyone tell me what the problem might be?

Discussions

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liquidhandwash

2 years ago

Some induction motors get a bit confused, something to do with the residue magnetism in the core. Spin the fan the correct direction, with your finger then turn it on.

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EddieP21liquidhandwash

Answer 2 years ago

Thanks, I'll give that a try as soon as I get it back together.

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iceng

2 years ago

I see a capacitor and a coil inductor that could deal with speed setting or lag / lead MMF ( Magnto Motive Force )... There is a loose red wire with a spade connector that presumably goes to the capacitor. The four wire nuts look recent. If you worry about brittle insulation slide shrink tube across the wires...

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EddieP21

2 years ago

Thanks for all the suggestions. Here are some photos. Some of the wires are pretty brittle so I guess I need to rewire everything once I get it working right.

IMG_3246.JPGIMG_3247.JPGIMG_3248.JPGIMG_3249.JPGIMG_3250.JPG
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steveastrouk

2 years ago

Show us a picture of all the internal wiring. If there's a Capacitor, there are usually three wires, with one on the cap going to one wire on its own, the other cap wire + another wire going to live, and the final wire to neutral. Swap any pair.

There is usually a ground wire. Make sure THAT stays on its own, and grounded !!!

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Josehf Murchison

2 years ago

Sounds like the brushes have been reversed. On a AC segmented commutator to reverse the motor you reverse the leads to the brushes.

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EddieP21Josehf Murchison

Answer 2 years ago

Thanks for the suggestion Josehf. I'm not sure how to check that but there are two wires going to a capacitor. One red and one black. Can I reverse them? Will that do anything?

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Josehf MurchisonEddieP21

Answer 2 years ago

That sounds like a starting capacitor.

Is the motor an induction motor?

If it is the capacitor is an AC capacitor and switching the wires won't do anything.

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rickharris

2 years ago

Been dismantled and the fan put on backwards would be my first port of call.

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EddieP21rickharris

Answer 2 years ago

Thanks for the suggestion. I took the blade off and it can only go on one way but it was a good idea.