Design and Analysis of Permanent Magnet Linear Synchronous Motor with Special Pole Shape

Abstract

Permanent magnet linear synchronous motors (PMLSMs), which have great advantages, such as simple structure, high positioning accuracy, good performance, high thrust force density, high dynamic response, are widely used in high precision direct drive field. As a research focus and difficulty, the force ripper and dynamic characteristic of PMLSM is important for its performance. In this paper, the present research status and characteristics of PMLSM is discussed firstly. Then a 16-pole 15-slot PMLSM is built used finite element method (FEM). Based on the finite element model, the thrust force ripple and minimization technologies, the power factor and efficiency of PMLSM with different load, were solved and analyzed, and an optimized model was got. The analysis result of thrust and magnetic flux density shows that through the new geometry of primary tooth shape, named optimized model, can improve the average thrust and reduce thrust fluctuations. The optimized model also has higher the power factor and efficiency. The back EMF of original and optimized model are also compared and discussed.

Design Method for Flux-Concentrating Permanent-Magnet Traction Machine Based on Voltage-Parameter Map

“…Until now, there have been almost no studies on a method for designing a PM synchronous motor with a high-power factor and a method for determining design parameters suitable for HEVs/EVs. Regarding studies on the power factor of PM synchronous motors, Y. Wang, D. Ionel, X. Wang, F. Zhao, and other researchers analyzed the power-factor characteristics of motors with different stator and rotor shapes [17][18][19][20], and Y. Kataoka analyzed the power-factor characteristics for different combinations of the pole number and slot number [21]. However, only the power factor characteristics were analyzed; there have been almost no studies on a method for improving the power factor at the desired design point.…”