|
|
|
Rotor eddy current loss in high speed permanent magnet motors
for flywheel energy storage system |
| TIAN Zhan-yuan, ZHU Chang-sheng, WANG Ding |
| College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China |
|
|
|
Abstract In order to reduce the rotor eddy current loss, which is mainly caused by temporal harmonics in the excitation current, spatial harmonics in the pulsating stator magnetic motive force, and the airgap permeance variation due to slotopenings, and improve the efficiency of high speed permanent magnet motor, the spatial harmonics of the airgap flux density and the temporal harmonics of the excitation current were first analyzed by ANSOFT software, The influences of slot opening width and airgap length on the rotor eddy current loss were studied considering the skin effect. The mechanism and the effectiveness of a thin unmagnetized metal shielding ring around the magnets, which uses the shielding effect of the eddy current magnetic field, to reduce the eddy current loss in the rotor core, the magnets, and the retaining sleeve were analyzed. The effects of the electrical conductivity and thickness of the shielding ring on the rotor eddy current loss were analyzed. The results show that a thin unmagnetized metal shielding ring around the magnets only with a properly chosen slot opening width, airgap length, electrical conductivity and thickness of the shielding ring can significantly reduce the total eddy current loss of the rotor．
|
|
Published: 16 March 2012
|
|
|
飞轮储能用高速永磁电机转子的涡流损耗
为了减小高速永磁电机中由定子电流的时间谐波、定子磁动势的空间谐波以及定子槽开口造成的气隙磁导变化引起的转子涡流损耗,提高电机的效率,采用ANSOFT有限元软件分析了高速永磁电机中气隙磁场和定子电流.研究了槽开口大小以及气隙长度对转子涡流损耗的影响,分析了利用涡流磁场的屏蔽作用，提出在永磁体外增加一薄层非导磁金属屏蔽环来减小转子铁心、永磁体和护套损耗的机理和有效性,以及屏蔽环的电导率和厚度对转子涡流损耗的影响.结果表明：在合理选取槽开口大小、气隙长度和非导磁金属屏蔽环电导率和厚度的情况下,添加非导磁金属屏蔽环可以有效地减小转子涡流损耗.
|
|
| ［1］ CHEN Y, ZHU Z Q, HOWE D, et al. Rotor eddy current loss in singlephase permanent magnet brushless DC motor ［J］. IEEE Transactions on Industry Applications, 2007 (07): 537-543．
［2］ 周凤争, 沈建新, 林瑞光. 从电机设计角度减少高速永磁电机转子涡流损耗［J］. 浙江大学学报: 工学版, 2007, 41(9): 1587-1591．
ZHOU Fengzheng, SHEN Jianxin, LIN Ruiguang. Reduction of rotor loss in highspeed PM motors by design method ［J］. Journal of Zhejiang University: Engineering Science, 2007, 41(9): 1587-1591．
［3］ WANG Jiqiang, WANG Fengxiang, YU Tao. Analysis of rotor losses for a high speed PM generator ［J］. IEEE Transactions on Magnetics, 2002(38): 3285-3287．
［4］ ISAO T, TAKAHASHI K, KAZUNOBU O. A super high speed PM motor drive system by a quasicurrent source inverter ［J］. IEEE Transactions on Industry Application, 1994, 30(3): 0093-9994．
［5］ NICOLA B, SILVERIO B, FABIO L. Potentials and limits of highspeed PM motors ［J］. IEEE Transactions on Industry Applications, 2004, 40(6): 0093-9994．
［6］ TODA H, XIA Z, WANG J, et al. Rotor eddycurrent loss in permanent magnet brushless machines ［J］. IEEE Transactions on Magnetics, 2004, 40(4): 2104-2106．
［7］ 周凤争, 沈建新, 王凯. 转子结构对高速无刷电机转子涡流损耗的影响［J］. 浙江大学学报: 工学版, 2008, 42(9): 1587-1590．
ZHOU Fengzheng, SHEN Jianxin, WANG Kai. Influence of rotor structure on rotor eddycurrent loss in highspeed permanent magnet brushless DC motors ［J］. Journal of Zhejiang University: Engineering Science, 2007, 41(9): 1587-1590.
［8］ FAUSTO F, ALEXAMDER N. An improved approach to power losses in magnetic laminations under nonsinusoidal induction waveform ［J］. IEEE Transactions on Magnetics, 1990, 26(5): 2904-2910．
［9］ 王晓远, 李娟, 齐立晓, 等. 盘式永磁同步电机永磁体内涡流的有限元分析［J］. 微电机, 2007, 40(1): 1001-6848．
WANG Xiaoyuan, LI Juan, QI Lixiao, et al. FEM analysis of the eddy current in the permanent magnet of disc type permanent magnet synchronous machines ［J］. Micromotors, 2007, 40(1):1001-6848． |
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
