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Rotor eccentricity is an inevitable obstacle in achieving better vibration, noise, and harshness (NVH) performance. This paper investigates the sensitivity of slot-pole combinations to unbalanced magnetic pull (UMP) induced by eccentricity in permanent magnet synchronous machines (PMSMs). Firstly, the radial force of PMSMs under eccentricity is analyzed theoretically, and the reason for the asymmetry of sideband harmonics is pointed out. By comparing the machines with different slot and pole numbers, it is found that the UMP is barely sensitive to the slot number, while machines with more pole numbers are more likely to induce larger UMP under eccentricity. Besides, the paralleled winding structure in the integer-slot PMSM is more effective in suppressing the UMP than the fractional-slot PMSM. Prototypes have been manufactured and tested to verify the analysis results.
Wen et al. (Thu,) studied this question.