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| Analytical Calculation of No-Load Magnetic Field in Permanent Magnet Linear Synchronous Motors Based on an Accurate Subdomain Model |
| Wang Mingjie1, Xu Wei2, Yang Cunxiang1, Qiu Hongbo1, Zhu Jianguo3 |
1. School of Electrical and Information Zhengzhou University of Light Industry Zhengzhou 450002 China;
2. School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China;
3. School of Electrical and Information University of Sydney Sydney NSW2006 Australia |
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Abstract Accurate calculation of the magnetic field distribution in permanent magnet linear synchronous motor (PMLSM) is required to obtain the parameters and performance, and the establishment of an accurate mathematical model is the key to solving the magnetic field problem. To avoid the limitations of the traditional analytical theory of PMLSM in solving the slot effect on air gap magnetic field, an accurate subdomain model of PMLSM is proposed to obtain the accurate magnetic field distribution. By taking into account the relative magnetic permeability of the permanent magnet (PM), slot depth and mutual influence of all slots on the magnetic field distribution, the Laplace equation of permanent magnet subdomain, airgap subdomain and slot subdomain are established in the scalar magnetic potential. According to the boundary conditions of each subdomain interface, all boundary condition equations are set up based on the Fourier series method, and the equivalent model of end area is established. The scalar magnetic potential and no-load flux density distribution of each subdomain are then solved. The slot and end effects on the spatial distribution of air gap magnetic field are discussed. The accuracy of analytical model is validated by the finite element method (FEM) results.
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Received: 22 January 2019
Published: 12 March 2020
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2020, Vol. 35 
