Posted by admin on Wednesday, May 27, 2009 · Leave a Comment
If the 3 phase motor is fed with 3 phase wires only meaning it is internally connected in Star (wye) or Delta then swapping over 2 of the 3 supply wires will reverse the rotation.
For single phase motors it depends on the type of motor.
Certain single phase motors such as permanent capacitor or shaded pole motors are not built to be reversed and are often fitted to equipment such as fans and pumps that do not require reversing
Where a 3 phase motor has 3 windings - single phase induction motors usually have 2 windings, a run winding connected all the time and a start or auxiliary winding that is only connected for a few seconds at start up. to Reverse a single phase induction motor the flow of current in one of the windings needs to be reversed not both so reversing the supply will not work. As both windings are effectively in parallel when supply is switched on.
In a universal series motor which used brushes and has a field winding and an armature winding again reverse the flow of current in one of the windings to reverse the direction. This motor is typically used in power tools especially the power drill which often has a reversing switch on it.
The previous answers saying reversing of a AC single phase motor is not possible are wrong the answerers are obviously not familiar with the various different types of single phase motors available.
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