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Author Topic:   Reverse rotation of electric motor
Taylor posted 04-05-2003 12:33 PM ET (US)   Profile for Taylor   Send Email to Taylor  
I have a not exactly whaler related question, actually its just related to my whaler. I have an 110v AC electric motor powering the reduction geared winch that pulls my whaler up the track and into the boat house. The motor is the type you would see hanging off a table saw; it is perhaps about 1hp. The motor only pulls it in, I have to take off the belt drive to get the whaler back out.

Can anyone here give me some hints on what I would do to get the motor to spin the opposite direction? I assume that I have to change the polarity of a pair of wires in the starting circuit, and I probably need an a on-off-on switch switch to flip these back and forth.

Help get me started, please.

rsess1 posted 04-05-2003 03:34 PM ET (US)     Profile for rsess1  Send Email to rsess1     
You just have to buy a reversing switch at any electrical supply. About $40.
Taylor posted 04-05-2003 05:59 PM ET (US)     Profile for Taylor  Send Email to Taylor     
I'd not heard of a reversing switch. It would probably come with instructions too. I'll see what I can find.

I did a little more research and found that in a capacitor start motor (which mine is) there should be a capacitor, a centrifugal switch and some starting windings together in series, and in a 110 volt motor, they will be in parallel with a pair of running windings. So the goal is to reverse the ends on the capacitor-startingwinding circuit, commonly leads 5 and 8. This can be done with a reversing switch, or a four way switch many also be used to do the reversing, if you are being cheap. Which I am.

...Or I could take the motor out of my very dark boathouse, look on the side of it where it says 'Sears Reversible Motor' and simply see the note that says: 'for reverse operation, interchange red and black leads on tabs A and B'.

Duh.

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