S. Hwang et Dk. Lieu, DESIGN TECHNIQUES FOR REDUCTION OF RELUCTANCE TORQUE IN BRUSHLESS PERMANENT-MAGNET MOTORS, IEEE transactions on magnetics, 30(6), 1994, pp. 4287-4289
Reluctance torque is often a principal source of vibration and control
difficulty in motors, especially at low speeds and loads. This paper
examines two motor design techniques, stator tooth notching and rotor
pole skewing with magnetic pole shaping, for reduction of reluctance t
orque, and the effect of each method on the output torque. Prediction
of results was performed by finite element analysis of the airgap flux
, Maxwell stress method sad Fourier decomposition to calculate the per
iodic reluctance torque. The analyses show that the reluctance torque
can be nearly eliminated by the suggested designs, with minimal sacrif
ice of output torque.