Investigation of a new stator interior permanent magnet machine

A new stator interior permanent magnet (PM) machine which is developed from the doubly salient PM machine is proposed. The novelty of this machine lies in the split stator pole and full-pitched windings, where tooth-shoe is adopted and the PM is inserted into the stator pole. This configuration can offer higher power density and lower cogging torque ripple than the doubly salient machine. In order to achieve high power density, the smaller thickness of PM may be more favourable. In this case, an analytical method is used to examine the demagnetisation of PM under short-circuit current. A prototype machine for wind power application is designed, built and tested. The experimental results validate the theoretical analysis and the effectiveness of the proposed stator interior PM machine.