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《Journal of Zhejiang University(Engineering Science)》 2007-09
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Reduction of rotor loss in high-speed permanent magnet motors by design method

ZHOU Feng-zheng,SHEN Jian-xin,LIN Rui-guang (College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)  
The rotor eddy current loss in high-speed permanent magnet brushless direct current motors is mainly caused by the space harmonics and time harmonics of armature current and the airgap permeance variation due to slot-openings.Rotor loss reduces the power efficiency and demagnetizes the magnets.From motor design aspect,the influences of various stator structures,slot opening width and airgap length on the rotor loss were studied through both analytical calculation and finite element simulation.The space harmonics of armature magnetic motive force were calculated by current-sheet method and Fourier analysis.Then the rotor loss was derived based on an improved model with the skin depth and the eddy current reaction field taken into account.The results show that 2poles-3slots nonoverlapping motor exhibits high evenorder space harmonics of stator magnetic motive force,and consequently causes much rotor loss.Different stator structures have an impact on the rotor eddy current loss and the rotor loss can be reduced by proper motor design.
【Fund】: 浙江省自然科学基金资助项目(Y104442);; 教育部留学回国人员科研启动基金资助项目
【CateGory Index】: TM351
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Chinese Journal Full-text Database 4 Hits
1 ZHOU Feng-zheng1,2,SHEN Jian-xin1,WANG Kai 1(1.College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China;2.Technical Center of Tianjin Electric Power Corporation,Tianjin 300040,China);Influence of rotor structure on rotor eddy-current loss in high-speed permanent magnet brushless DC motors[J];Journal of Zhejiang University(Engineering Science);2008-09
2 ZHOU Feng-zheng1,LIU Bao-cheng1,Tang Qing-hua1,WANG Kai2,SHEN Jian-xin2(1.Technical Center of Tianjin Electric Power Corporation,Tianjin 300040,China;2.College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China);Research on Rotor Magnetization of High-speed PM Brushless DC Motor[J];Micromotors;2009-08
3 ZHOU Feng-zheng1,LIU Bao-cheng1,TANG Qing-hua1,WANG Kai2,SHEN Jian-xin2 (1.Technical Center of Tianjin Electric Power Corporation,Tianjin 300384,China;2.College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China);Design and Test of High-Speed Permanent Magnet Brushless DC Motor[J];Electric Machines & Control Application;2010-01
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【Secondary References】
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1 Lü Changpeng,Zhang Lichun,Li Bo ( Wuhan Institute of Marine Electric Propulsion ,CSIC,Wuhan 430064,China);Study on Rotor Eddy Current Losses in AC Permanent Magnet Motor[J];Marine Electric & Electronic Engineering;2010-02
2 WANG Kai,JIN Meng-jia,SHEN Jian-xin(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China);Study on rotor configurations in third harmonic based high-speed BLDC motor[J];Journal of Zhejiang University(Engineering Science);2010-03
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