Influencing factors on the demagnetization of line-start permanent magnet synchronous motor during its starting process

The irreversible demagnetization of permanent magnet due to the armature reaction during the starting process of line-start permanent magnet synchronous motor (LSPMSM) has the tremendous influence on the performance, even makes the electrical machine unable to work. This paper adopts the two-dimensional time-stepping finite element method to calculate the demagnetization of permanent magnet, and analyze the influencing factors, such as the load factor and the inertia factor, the initial rotor position, and the supply voltage amplitude. Finally, the experiment validates the creditability of the calculation results of the finite element method.

[1]  Xiaoyong Shen,et al.  Design of doubly salient permanent magnet motor for small displacement ISG mild hybrid , 2009, 2009 International Conference on Mechatronics and Automation.

[2]  Zhang Jian Demagnetization Field Analysis and Calculation for Line-start Permanent Magnet Synchronous Motor During Start Process , 2011 .

[3]  J. Lobry,et al.  Analytical design of an axial flux permanent magnet in-wheel synchronous motor for electric vehicle , 2009, 2009 13th European Conference on Power Electronics and Applications.

[4]  Ju Lee,et al.  Demagnetization Analysis of Permanent Magnets According to Rotor Types of Interior Permanent Magnet Synchronous Motor , 2009, IEEE Transactions on Magnetics.

[5]  Antero Arkkio,et al.  Demagnetisation state of permanent magnets in large output power permanent magnet synchronous motor , 1999, IEEE International Electric Machines and Drives Conference. IEMDC'99. Proceedings (Cat. No.99EX272).

[6]  J. Hur,et al.  Analysis of irreversible magnet demagnetization in line-start motors based on the finite-element method , 2003 .

[7]  Tianyu Wang,et al.  Study on Anti-Demagnetization of Magnet for High Speed Permanent Magnet Machine , 2010, IEEE Transactions on Applied Superconductivity.

[8]  Tomy Sebastian,et al.  Temperature effects on torque production and efficiency of PM motors using NdFeB magnets , 1993, Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting.