Reversing Single Phase Motor
Reversing Single Phase Motor
(OP)
What will be the easiest way to reverse the rotation of a single phase cap start/ cap run electric motor without blowing any capacitor or burning the motor? I attached here the wiring diagram.
Regards,
Hoover
Regards,
Hoover





RE: Reversing Single Phase Motor
Only if auxiliary and main windings are *exactly equal*, it could be possible. The trick then is to switch windings. Disconnect wires from right-end sides of windings and reconnect with main and auxiliary windings switched.
But, if the auxiliary winding is different from the main winding, which is almost always true, you can't do it. You will certainly fry the auxiliary winding.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Reversing Single Phase Motor
If you can't access the point where the yellow wire joins the main and the start winding you are probably out of luck.
Bill
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"Why not the best?"
Jimmy Carter
RE: Reversing Single Phase Motor
The real motor may not be quite so ideal, so I can understand why Gunnar mentions the possibility this might work.
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(2B)+(2B)' ?
RE: Reversing Single Phase Motor
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(2B)+(2B)' ?
RE: Reversing Single Phase Motor
On second thought, I agree that it is probably be a good idea to change yellow and black wires of the main winding.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Reversing Single Phase Motor
RE: Reversing Single Phase Motor
Bill
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"Why not the best?"
Jimmy Carter
RE: Reversing Single Phase Motor
It did run in reverse but it was too slow and noisy when we connect the main winding end (black wire) to the blue wire between the starting capacitor and centrifugal switch.
Regards,
Hoover
RE: Reversing Single Phase Motor
"What will be the easiest way to reverse the rotation of a single phase cap start/ cap run electric motor without blowing any capacitor or burning the motor? I attached here the wiring diagram."
Most all single phase motors are reversed at the Start Winding. Or in the case of the drawing, "auxiliary winding".
A Double Pole, Double Throw toggle switch connected as shown in the wonderfully illustrated drawing attached will reverse the motor.
Once the motor has started and come up to full speed, the motor's internal centrifugal switch disconnects the auxiliary winding.
Hence, the motor will only reverse after it has been shut off and allowed to slow enough to actuate the internal switch again.
John
RE: Reversing Single Phase Motor
A possibility;
As I understand it, you have two wires going into one end of the tube and the yellow winding coming out of the other end.
If you cut one of the wires going into the end of the tube, you will have one end of one winding. Use a multi-meter to see which one it is and then reconnect in reverse.
Bill
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"Why not the best?"
Jimmy Carter
RE: Reversing Single Phase Motor