Affiliations: [a] School of Electrical Engineering and Automation, Anhui University, Hefei, China | [b] National Engineering Laboratory of Energy-Saving Motor & Control Technology, Anhui University, Hefei, China | [c] Collaborative Innovation Center of Industrial Energy-Saving and Power Quality Control, Anhui University, Hefei, China
Correspondence:
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Corresponding author: Rui Zhou, College of Electrical Engineering and Automation, Anhui University, Hefei, Anhui 230601, China. Tel.: +86 13965094934; E-mail: 11007@ahu.edu.cn
Abstract: The magnetic field and torque of permanent-magnetic spherical motor (PMSpM) are difficult to analyze due to the complicated structure, and therefore are often analyzed by the finite-element method (FEM) or Lorentz force method, with large amount of calculation and time consumption. This paper first establishes a three-dimensional (3-D) magnetic field analytical model of a spherical motor with permanent magnets (PMs) by the equivalent surface current method. Secondly, through the Lorentz force spatial integration of energized stator coil, a torque analytical model is established. Thirdly, in order to avoid repeated integration operation, a torque interpolation model based on torque Map is established. Both magnetic field and torque analytical models are verified by comparing with FEM and the experiment respectively. It is shown that the method proposed not only ensures the modeling accuracy but also significantly speeds up the analysis.
Keywords: Permanent-magnet spherical motor (PMSpM), Lorentz force method, Torque modeling, Interpolation calculation
