Abstract
The article presents the results from studying the eccentricity in permanent magnet synchronous machines having different numbers of slots per pole and phase (q). The advantages and drawbacks of using winding arrangements with different values of qareshown. An expression describing the physical processes of interaction between spatial induction harmonic components in the air gap under eccentricity conditionsisanalyticallyobtained. The electromagnetic torque pulsations arising with different kinds of eccentricity—static, dynamic, and mixed—are determined with the aid of field models and using the Maxwell magnetic tension forces. Differences between the obtained characteristics are pointed out. Aprocedurefor calculating the electromagnetic torque pulsations in the no-load and on-load operation modes using the Femm finite-element computer program is presented. Recommendations on selecting the qvalue for reducing the negative effect of different eccentricity kinds aregiven.
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