Recently, a new class of brushless motors, namely the doubly salient permanent magnet (DSPM) motor, has been introduced [1]. The DSPM motor combines the advantages of both the switched reluctance motor and the PM brushless motor. Namely the rotor is the same as that of the SR machine so that the advantages of simple configuration and mechanical robustness can be retained while the PMs are located in the stator so that the irreversible demagnetization and mechanical instability can be solved. However, due to the doubly salient structure, the DSPM motor generally suffers from severe torque ripples [2], thus limiting its application to servo control.
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