Open-Circuit Air-Gap Magnetic Field Calculation of Interior Permanent Magnet Synchronous Motor With V-Shaped Segmented Skewed Poles Using Hybrid Analytical Method

An, Yuansheng; Ma, Conggan; Zhang, Nic; Guo, Yue; Degano, Michele; Gerada, Chris; Li, Qiongyao; Zhou, Shengsen

Abstract

Due to the local inhomogeneous magnetic saturation of the core of the interior permanent magnet synchronous motor (IPMSM), the magnetic field changes nonlinearly, which makes the analytical calculation of the magnetic field difficult. Therefore, the calculation of the magnetic field mostly relies on the finite element method (FEM). However, the high computation cost of FEM restricts the efficiency of the design and analysis of IPMSM. In this article, an analytical model (AM) of slotless open-circuit air-gap magnetic field (OC-AG-MF) of IPMSM with V-shaped segmented skewed poles is derived by combining the subdomain method (SDM) and the magnetic equivalent circuit (MEC) method, and then, the AM of slotted OC-AG-MF of IPMSM with V-shaped segmented skewed poles is obtained by introducing the complex relative permeance. To show the effectiveness of the novel AM, the OC-AG-MF and cogging torque of an IPMSM with V-shaped segmented skewed poles for electric vehicles are calculated by the AM and FEM, respectively. The spatial order, amplitude–frequency characteristics, and the 3-D spatial distribution of the OC-AG-MF are analyzed. Finally, the accuracy of the AM is experimentally verified by direct measurement of OC-AG-MF and no-load back electromotive force (EMF) of the motor. The AM proposed in this article is shown to accurately calculate the radial and tangential components of OC-AG-MF of IPMSM with V-shaped segmented skewed poles considering rotor magnetic bridge saturation effect and stator slotting effect. Meanwhile, the efficiency of the design and analysis of the motor is expected to be improved due to the reduced computational effort compared to the prevalent FEM.

Citation

An, Y., Ma, C., Zhang, N., Guo, Y., Degano, M., Gerada, C., Li, Q., & Zhou, S. (2021). Open-Circuit Air-Gap Magnetic Field Calculation of Interior Permanent Magnet Synchronous Motor With V-Shaped Segmented Skewed Poles Using Hybrid Analytical Method. IEEE Transactions on Magnetics, 57(12), Article 8108309. https://doi.org/10.1109/tmag.2021.3118222

• Journal Article Type: Article
• Acceptance Date: Sep 29, 2021
• Online Publication Date: Oct 5, 2021
• Publication Date: Dec 1, 2021
• Deposit Date: Nov 28, 2024
• Journal: IEEE Transactions on Magnetics
• Print ISSN: 0018-9464
• Electronic ISSN: 1941-0069
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 57
• Issue: 12
• Article Number: 8108309
• DOI: https://doi.org/10.1109/tmag.2021.3118222
• Keywords: Electrical and Electronic Engineering; Electronic, Optical and Magnetic Materials
• Public URL: https://nottingham-repository.worktribe.com/output/7353374
• Publisher URL: https://ieeexplore.ieee.org/document/9559921