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Vintage threads from the first ten years
Anybody know how to reverse the rotation of a small AC
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 3/12/2006 9:49 AM |
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| Gibson Guy | Anybody know how to reverse the rotation of a small AC Motor? I am not an electrical engineer and know very little about it other than I can read simple circuts and it can shock the shite out of you. Anyhelp would be greatly appreciated. GG |
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| 3/12/2006 10:46 AM |
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stan |
You have to install a polarity (phase) switch on one of the the motor brushes. Any guitar wiring site will have a diagram for a pickup phase switch. Instead of a pickup, you will be using one of the motor brushes. |
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| 3/12/2006 11:28 AM |
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| RS | Stan has it: you swap either the brush connections OR the field coil connections. Rob. |
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| 3/12/2006 4:38 PM |
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| Mystic | Lots of AC motors are DC as well. If you can, running it on DC makes it easier to run it backwards. |
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| 3/12/2006 6:19 PM |
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| Gibson Guy | I wouldnt even know where to start to figure out how to run it on DC. Is it a lot of work to do or should I say a lot of electrical know how involved? |
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| 3/12/2006 7:44 PM |
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| David King |
A simple bridge rectifier of sufficient wattage will get you something close enough to DC to run a motor. A big cap in series will clean it up a bit more if you are seeing some arcing in the brushes. I think you'd be better off getting a reversible AC motor to begin with. |
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| 3/13/2006 1:33 AM |
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| Steve A. |
GG: How small is this motor? For those small c-frame motors on exhaust fans (40-60 watts) you can usually take it apart and reverse the rotor. For larger motors like a furnace blower motor (1/5 - 3/4HP), they do make electrically reversible motors. (In the olden days they would stock double shaft motors and cut off the end that wasn't needed.  ) I've tried taking the modern non-reversible motors apart and switching the two end bells but was not very pleased with the results. For one thing the motor leads are on the inside of the blower, not the outside and they could get damaged.
Tell us more about what you are trying to do. Steve Ahola |
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