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Brushless dc motor

The flux distribution produced by the permanent North and South magnets located on the rotor is represented by the green space vector λf. A power-processing unit supplies three-phase currents to the stator windings in such a manner that the resultant stator current space vector Is is 90o ahead of the rotor flux vector. The mmf distribution produced by the stator currents flowing in the stationary three-phase windings is equivalent to that produced by Is flowing in a single sinusoidally-distributed rotating winding whose magnetic axis lines up with Is as illustrated in this animation.

© M. Riaz