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Originally Posted by Jim H
As far as I know:
The commutator 're-aligns' the rotor field so that it can continue to produce torque, otherwise the rotor would turn through 180 degrees until the fields aligned, and then stop. Not too useful without commutation. 
Again, the angle between fields produces torque, but no commutator is required because the field is rotating.
For further reading and enjoyment,
http://www.engin.umich.edu/labs/csdl/ME350/motors/
Best Regards,
Jim |
Thanks, this helps a lot, I can relate the commutation in the DC motor to the rising and falling fields around the windings of the AC motor. Commutation was driven home on mechanical rectification in DC generators.