Dual winding slot area allocation ratio effect on torque and suspension performance of BPMSMs

Hongbo Qiu; Huaiyuan Zhang; Guangchuan Liang; Cunxiang Yang

Dual winding slot area allocation ratio effect on torque and suspension performance of BPMSMs

Vol. 25, No. 5, pp. 868-876, May 2025

10.1007/s43236-024-00931-0

Dual winding design

Thermal load analysis

Optimization of slot area allocation ratio

Radial suspension force and electromagnetic torque

Abstract

The introduction of suspension winding generates radial suspension force in bearingless permanent magnet synchronous motors (BPMSMs). However, the addition of suspension winding in the stator slots reduces the slot area of the torque winding. This results in a decrease in the motor torque characteristics, while the thermal load increases. Therefore, to obtain the optimal operating performance of the motor, the variations in torque performance and suspension characteristics are studied with the slot area allocation ratio (SAAR) of the dual winding in this paper. First, the expressions for the electromagnetic torque and radial suspension force with SAAR are derived by the Maxwell tensor method. The effects of the winding parameters on the BPMSM performance are determined and the influences of the current and turn number of the dual winding are considered in the expressions. Subsequently, the effects of thermal load on the torque and suspension force are analyzed by the finite element method (FEM). The optimal motor operating performance with the total thermal load constraint is determined. On this basis, the effects of the dual winding SAAR on the torque and suspension force are studied, the coupling relationship between the torque and the suspension force is obtained, and the optimal matching relationship of the torque and the suspension force at different SAAR values are determined. Finally, the accuracy of the analyses is confirmed by performing static and dynamic experiments on a prototype.

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Cite this article

[IEEE Style]

H. Qiu, H. Zhang, G. Liang, C. Yang, "Dual winding slot area allocation ratio effect on torque and suspension performance of BPMSMs," Journal of Power Electronics, vol. 25, no. 5, pp. 868-876, 2025. DOI: 10.1007/s43236-024-00931-0.

[ACM Style]

Hongbo Qiu, Huaiyuan Zhang, Guangchuan Liang, and Cunxiang Yang. 2025. Dual winding slot area allocation ratio effect on torque and suspension performance of BPMSMs. Journal of Power Electronics, 25, 5, (2025), 868-876. DOI: 10.1007/s43236-024-00931-0.