Affiliations: [a] School of Electrical Engineering, Shenyang University of Technology, Shenyang, China
Correspondence:
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Corresponding author: Ting Dong, Ministry of Education Key Laboratory of Special Motors and High Voltage Appliances, School of Electrical Engineering, Shenyang University of Technology, Shenyang City, Liaoning Province 110870, China. Tel.: +86 13940036082; E-mail: T_Dong_SUT@126.com
Abstract: The calculation accuracy of unbalanced magnetic forces (UMF) is very important to the design of rotor length, because it will effect the shaft deflection. But in some permanent magnet synchronous motors (PMSMs) with fractional slot concentrated windings (FSCW), the UMF caused by asymmetrical stator topology structure is not considered in the existing deflection calculation, which is very fatal for the operational reliability, especially for the PMSMs with the large length-diameter ratio, such as submersible PMSMs. Therefore, the part of UMF in the asymmetrical stator topology structure PMSMs caused by the choice of pole-slot combinations is analysized in this paper, and a more accurate rotor deflection calculation method is also proposed.
Keywords: Unbalanced magnetic force (UMF), permanent magnet synchronous motor (PMSM), fractional slot concentrated winding (FSCW), pole-slot combinations, deflection calculation
