Further Study on Analytical Model for Iron Losses of Permanent Magnet Machine with Bevelling Magnet

Abstract

This paper proposes bevelling magnet edges that can reduce iron losses in permanent magnet (PM) machines. The maximum flux density and time rate change of flux density in teeth and yoke are deduced, respectively, considering a random angle of bevelling magnet edges. The analytic models of the average eddy current and hysteresis loss in teeth and yoke are presented respectively. The torque ratio of bevelling 75° and right-angle magnet is 0.983, whereas the ratio of PM material required between two cases is 0.971. Experimental results were proposed to verify the analytic model of total iron losses.

Key Words:

• Permanent magnet
• surface-mounted
• eddy current loss
• hysteresis loss
• iron losses
• analytic model
• flux density

Additional information

Notes on contributors

H. Wang

Haitian Wang received his BS degree in computation mathematics and ME degree in electrical engineering from Sichuan University, Chengdu, PR China, in 1999 and 2003, respectively. In 2003, he joined Jiaying College, Meizhou, PR China, and has been engaged in research and development of machine design and control. He is currently a doctoral student with the Department of Electrical Engineering, Shanghai Jiaotong University. He is engaged in research on optimisation of permanent magnet machines and design of the snubber in the neutral beam injector system of the experimental advanced superconducting tokamak.

G. Li

Ge Li received his BEng degree in electrical engineering from Hefei Industry University, Anhui, PR China, in 1987, and PhD degree on electric machines from Institute of Plasma Physics, The Chinese Academy of Sciences (ASIPP), in 1994. He was a Postdoctoral Fellow in the National Synchrotron Radiation Laboratory (NSRL), University of Science and Technology of China (USTC), Hefei, where he was an Associate Professor in 1996. In 2004, he joined the Department of Electrical and Computer Engineering, Shanghai Jiao Tong University, as a full Professor for a period of almost four years, until he was finally tempted back into more basic academic life for green energy investigation. He was at NSRL, USTC, where he was involved in the research on accelerators and free electron lasers. He was in the Department of Electrical and Computer Engineering, University of Manitoba, Winnipeg, MB, Canada, where he was involved in the research on electric machines, and in the Department of Electrical and Electronics Engineering, University of Newcastle upon Tyne, Newcastle upon Tyne, UK, where he was involved in the research on induction energy transfer. He is currently a Professor at ASIPP and the Group Leader of transfer cask system for ITER remote handing.

L. Cao

Liang Cao is a PhD. candidate in the Electrical Engineering Department of Shanghai Jiao Tong University, China. His professional interests have been mainly related to electromagnetic device design, high-voltage high frequency converters and electromagnetic finite element calculation.

X. Hong

Xuan Hong received her BEng and MEng degrees in 2005 and 2008, respectively, in electrical engineering, both from Shanghai Jiao Tong University, China. In 2008, she joined ABB Engineering (Shanghai) Ltd and has worked there since. She was at Department of Electrical Engineering, Shanghai Jiao Tong University, China, where she was involved in research on electric machines.