Abstract
The bearingless permanent magnetic synchronous motor (BPMSM) is a new type of special motor that has been receiving extensive attention in recent years. In this paper, a design method based on electromagnetic calculation for BPMSMs is proposed. Main dimensions including the effective length, diameter, and parameters of the permanent magnet and windings can be obtained. Then, to inhibit higher harmonics, two measures are taken. One measure is using short-pitch windings instead of conventional full-pitch windings, and the other measure is adopting a new type of cosine shape of permanent magnets. Finally, the structure and unbalanced flux density distributions of the designed prototype are studied by finite-element analysis, which verify the correctness of the design method, and better optimization results are obtained.
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