永磁同步电机气隙磁密影响因素的分析  

Influencing Factor Analysis of PMSM Air Gap Flux Density

作　　者：赵朝会[1] 李遂亮[1] 王新威[1] 王永田[1] 

机构地区：[1]河南农业大学机电工程学院

出　　处：《河南农业大学学报》2005年第3期338-344,共7页Journal of Henan Agricultural University

基　　金：国家自然科学基金重点资助项目(50337030)

摘　　要：利用有限元计算研究了影响永磁同步电机气隙磁密的主要因素,讨论了IPM同步电机和SPM同步电机在聚磁方面的差异。研究表明,IPM同步电机气隙密随气隙的变化大于SPM同步电机;在IPM同步电机中建议采用非导磁性材料作转轴,而在SPM同步电机中,宜用导磁性材料作转轴;IPM同步电机中应选取较小的极弧系数,而在SPM同步电机应选取较大的极弧系数;在IPM同步电机中,磁钢厚度的变化对气隙磁密的影响和极弧系数对气隙磁密的影响相同,在SPM同步电机中,随磁钢度厚的增加气隙磁密逐渐增大,增大到一定值时基本保持不变,但每极磁通却随极对数的增加而减小;在IPM同步电机中,当极对数为4时,气隙磁密超过了永磁体的剩磁感应强度,具有聚磁作用;在SPM同步电机中,极对数为3时气隙磁密达到最大值,但它仍小于永磁体的剩磁感应强度,说明它不具有聚磁作用.This pape analyzes the influencing factors of PMSM air gap flux density using finite element calculation, and compare SPM （surface mounted permanent magnet） with IPM （interior permanent magnet） machine, then presents applied and intelligible conclusions： The machines air gap flux density is changed with the air gap length, the air gap flux density variety of IPM machine is bigger than that of SPM; To IPM, using non-magnetism shaft is our advice; To SPM, in order to ease fabricate, we suggesting magnetism shaft;To IPM, small pole arc coefficient is suitable; To SPM,however, bigger pole arc coefficient is necessary; To IPM, the air gap flux density has a suitable value due to the restriction condition of rare earth magnet thickness; To SPM, the restriction condition of rare earth magnet thickness does not exist, the air gap flux density is enhanced with the increase of the rareearth magnet thickness, then it reaches a constant levd when the rare earth magnet thickness exceeds some extent; IPM synchronous machine bears “flux concentration function”, when its pole pairs is more than or equal to 3, Bδ/BM 〉 1 or 4, Bσ/Br 〉 1 ; To SPM, it has no “flux concentration function”.

关 键 词：永磁同步电机 气隙磁密 影响因素 有限元分析 

分 类 号：TM313[电气工程—电机]