No-Load Iron Loss Model for a Fractional-Slot Surface-Mounted Permanent Magnet Motor Based on Magnetic Field Analytical Calculation

Chinese Journal of Electrical Engineering ›› 2018, Vol. 4 ›› Issue (4): 71-79.

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No-Load Iron Loss Model for a Fractional-Slot Surface-Mounted Permanent Magnet Motor Based on Magnetic Field Analytical Calculation

Xintong Zhang, Pengrui Fu, Yiguang Ma, Chengming Zhang^*, Liyi Li

Schoolof Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150006,China

Online:2018-12-25 Published:2019-10-31
Contact: *E-mail: cmzhang@hit.edu.cn.
About author:Xintong Zhang received the B.Sc. degree in electrical engineering from Dalian University of Technology, China, in 2016, the M.Sc. degree in electrical engineering from Harbin Institute of Technology, China, in 2018. He is currently working toward the Ph.D. degree. His current research interests include the high-efficiency, high-torque-density and high-reliability permanent magnet motor design. Pengri Fu received the B.Sc. degree in electrical engineering from Harbin Institute of Technology, China, in 2017. He is currently working toward the M.Sc. degree. His current research interests include the computation of temperature and fluid fields for permanent magnet motor. Yiguang Ma received the B.Sc. degree in electrical engineering from Hefei University of Technology, China, in 2017. He is currently working toward the M.Sc. degree. His current research interests include the reliability analysis of permanent magnet motor. Chengming Zhang received the B.E., M.E., and D.E. degrees from the Harbin Institute of Technology(HIT), China, in 2005, 2007, and 2013, respectively. Since 2013, He has been a lecturer with the School of Electrical Engineering and Automation, HIT. His research areas include high efficiency motor systems, high speed motors, energy conversion and control. Liyi Li (M’09) received the B.E., M.E. and D.E. degrees from the Harbin Institute of Technology(HIT), Harbin, China, in 1991, 1995, and 2001, respectively. Since 2004, he has been a Professor with the School of Electrical Engineering and Automation, HIT. In 2013, he became “Yangtze Fund Scholar” Distinguished Professor and is currently supported by the National Science Fund for Distinguished Young Scholars. He has authored or coauthored more than 110 technical papers and is the holder of 50 patents. His research interests include design, drive and control of linear motors, design and drive of high-speed/ power density permanent magnet machines.

Abstract

Abstract: The common analytical models for the no-load iron loss of permanent magnet(PM) motors usually neglect the iron loss caused by the rotating magnetic field in the tooth tips and the harmonics of the magnetic fields in the teeth and yokes. This paper presents an analytical model for no-load iron loss of a fractional-slot surface-mounted permanent magnet motor. According to the existing analytical model of the magnetic field distribution in the slotted air gap, the magnetic flux densities considering the harmonics of the stator tooth and yoke are both derived based on the continuity of magnetic flux. Due to the complexity of the magnetic field in the tooth tip, the tangential flux density of the tooth tip is approximated by an equivalent sine wave and the radial component is regarded to be the same as that of the corresponding tooth. After obtaining the magnetic fields in stator different regions, the analytical iron loss is calculated by using the Bertotti model and the orthogonal decomposition model. A 20-pole/24-slot PM synchronous motor is taken as an example. The maximum error between the analytical model and finite element model(FEM) is 5.46%, which verifies the validity of the proposed method.

Key words: No-load iron loss, fractional slot, permanent magnet motors, magnetic fields

Xintong Zhang, Pengrui Fu, Yiguang Ma, Chengming Zhang, Liyi Li. No-Load Iron Loss Model for a Fractional-Slot Surface-Mounted Permanent Magnet Motor Based on Magnetic Field Analytical Calculation[J]. Chinese Journal of Electrical Engineering, 2018, 4(4): 71-79.

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No-Load Iron Loss Model for a Fractional-Slot Surface-Mounted Permanent Magnet Motor Based on Magnetic Field Analytical Calculation

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