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Reversing an AC Motor

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Active Member
Hi Batman,

There are several types of A.C. motors.
To reverse rotation would usually involve altering the internal
wiring, but not usually taking it apart, unless its necessary to
get to the connections, even then its usually only partially
dis-assembled for access.

With a lot of A.C. motors you can make the alterations without
any dis-assembly of the motor at all.

Please give some details of the motor.

John :)


New Member
As John said, there are several types of AC motor.
The easiest to reverse are the squirrel cage motors, these have no connections to the rotor. For single phase you would have to reverse the connections of the starting winding. For three phase you reverse the connection of two phases.
For universal type motors, these are the ones with brushes, as found in power tools, revesing is a bit more messy as the wires to the brushes have to be reversed - and they are usually too short for that :( .
For shaded pole motors, these are the silent running ones usually found in small fans and such, reversing is just about impossible unless one manages to attach the shaft to the other side of the rotor :?


New Member
Must remember also that some AC motors are designed to turn in one direction only. The brushes on some motors have an "heel" and "toe" that can be broken off if the motor is turned in the wrong direction, ive seen this happen.


New Member
What kind of AC motor is it? Do you have the specs. If it is a split-cap AC motor (one that uses an external capacitor to generate the leading/lagging phase angle), you can easily change the direction by changing the wiring (see schematic). Check out the manufacturer's datasheet for wire diagrams and what value the capacitor should be.


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