This paper presents design and analysis of low-speed, high-torque permanent magnet motors. The motor has 16-pole, 18-coil construction, and a unique winding arrangement to produce high torque. The simplified torque analysis is proposed considering the line of magnetic induction distribution in the motor. The validity of the proposed analysis has been proved by both linear and nonlinear FEM analyses. The 500-Nm, 200-rpm test motor has been designed and constructed and the motor shows the expected characteristics.
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Mizutani et al. (2000) studied this question.