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Analysis of Radial Electromagnetic Force in Permanent Magnet Machine with Manufacturing Tolerance

This paper investigates the influence of the manufacturing tolerance on the radial electromagnetic force in an outer rotor surface-mounted permanent magnet synchronous machine (PMSM) with fractional-slot concentrated winding (FSCW) configuration. The finite element analysis (FEA) method is adopted to deal with the additional influence on the electromagnetic force caused by production variation of the magnets. The ideal condition is analyzed as reference. Results under inconsistency and positional deviation of the permanent magnets condition have been discussed and Fast Fourier Transform (FFT) is performed. It is revealed that the impact on the harmonic spatial orders of the radial electromagnetic force wave cannot be ignored.