ROTOR STRENGTH ANALYSIS OF SURFACE-MOUNTED HIGH SPEED PERMANENT MAGNET MACHINES
In the surface-mounted high speed permanent magnet (PM) machines,the magnets in the rotor generally consist of separate blocks that are glued onto the steel shaft.The magnets are not mechanically strong enough to bear the centrifugal stress resulted from the high speed rotation,therefore a nonmagnetic alloy enclosure is usually employed to retain the PMs on the rotor.The centrifugal stress of the PMs can be cancelled by the pre-stress applied to the outer surface of the PMs by means of magnet-enclosure interference fit.The selections of pre-stress,interference fit and enclosure thickness are based on the rotor strength analysis.In this paper,the analytical formulas for rotor strength of surfacemounted high speed PM machines is presented based on the rotor stress condition which can be simplified as a plane stress problem.The results of analytical calculations are compared with finite-element (FE) calculations.It is shown that the analytical method proposed in this paper can accurately predict the stress of the surface-mounted PM rotor with high speed and temperature variation.Finally,the rotor structure is optimized according to the analytical method of rotor strength.
high speed permanent magnet machines strength analysis optimal design FE
L.L.Chen C.S.Zhu B.J.Wang
College of Electrical Engineering, Zhejiang University, Hangzhou, China
国际会议
杭州
英文
173-180
2013-04-15（万方平台首次上网日期，不代表论文的发表时间）