



USA, ME, Ellsworth
Joined May 2008
19,593 Posts

That is what we also call cogging steps I think, you can get those from the Winding Scheme Calculator here:
http://www.bavariadirect.co.za/scheme/calculator/ For a 12N14P motor it is 84 cogging steps. Jack 


Joined Feb 2015
117 Posts

1 mechanical revolution is how far a rotor turns in order to get back into the physically identical position it started in. This is always 360 degrees.
1 electrical revolution is how far a rotor turns in order for it to get back into the magnetically identical position it started in. If there are only 2 poles on the motor, then the rotor will make a 360 degree rotation before the north and south poles are in the same position they started in. If there are 4 poles then the rotor will be magnetically in the same position after only 180 degrees. If there are 6 poles, then it will be 120 degrees and if there are 8 poles, then it will be 90 degrees. This means the electrical RPM's is always the number of pole pairs times the mechanical RPM's. Note that this is different than the number of commutations per rev and different than the number of cogging steps. In a "6 step" (trapezoidal) control, there are always 6 commutation steps per electrical revolution. And the number of cogging steps depends not only on the number of magnetic poles but also on the number of stator teeth. 


Joined Feb 2015
117 Posts

Yes, that's correct.

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