Performance of Polyphase Permanent Magnet Machines

Two methods are presented by which the performance of ac permanent magnet machines can be predicted. The first method utilizes phasor diagrams to include core-loss. The second method uses the concept of machine admittance; this admittance is also adjusted for the effects of core-loss. The admittance also defines the shape of the current locus as a function of voltage induced by the magnets.