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Optimal design and thermal analysis of PM spherical stepper motor

An investigation on the rotor and stator optimal design for a PM spherical stepper motor by experimental design method is presented and the thermal analysis is performed using 3-D FEM. Based on the torque characteristics analysis and full factorial design, three main control factors are selected and their effects on the torque characteristics are discussed in detail. Representative single step responses with different parameters were simulated. As for the steady-state thermal analysis, the relationships between the stator materials, thickness, and cooling modes with the temperature rise are presented and the computation results are given. The results provide the primary theoretical guide for the configuration design, optimization and control research of the spherical stepper motor.