弧形直线感应电机不均匀气隙磁场定量分析  

Flux density calculation of the arc linear induction motor with uneven air-gap

作　　者：刘思嘉 厉虹[1] 杨秀媛[1] LIU Si-jia;LI Hong;YANG Xiu-yuan(School of Automation,Beijing Information Science and Technology University,Beijing 100192,China)

机构地区：[1]北京信息科技大学自动化学院,北京100192

出　　处：《电机与控制学报》2020年第8期83-91,共9页Electric Machines and Control

基　　金：国家自然科学基金(51077004),北京市教委科研计划(KM201911232016)。

摘　　要：弧形直线感应电机可用作实现竖直转子无轴承电机,但次级转子偏心所导致的气隙不均匀对气隙磁场有显著影响。针对此问题,在推导气隙宽度数学表达式基础上,首先提出一种针对弧形直线电机不均匀气隙时的气隙磁场解析计算方法。接下来将此方法与有限元计算结果进行比较。结果表明,这种解析计算方法相比采用均匀气隙的计算方法能够大大提升气隙磁场的计算准确度。针对大气隙时计算精确度下降的问题,提出一种修正方法,进一步提升了计算结果的精确性。最后,将解析方法与瞬态场有限元结果进行了对比。对比结果表明,考虑了气隙不均匀的磁密解析计算公式能够将不同情况下的磁密计算误差减小50%~90%。这种解析方法为通过弧形直线感应电机的解耦控制实现无轴承电机的结构奠定了基础。The arc linear induction motor( ALIM) can be utilized to achieve vertical bearingless motor.The uneven air-gap,led by the eccentricity of the secondary rotor,will influence the gap flux density remarkably. Aiming at this,this paper firstly proposed an analytic approach to calculate the flux density of the ALIM based on the formula deduction of the air-gap. Next,the result was compared to the finite element methods( FEM). The comparison shows the analytic approach can eliminate the error significantly.Furthermore,according to the accuracy decreasing at large air-gaps,this paper presented a correction method to improve accuracy. Finally,the analytic and transient FEM results were compared. The comparison result illustrates that the flux error of method is 50% ~ 90% lower than the traditional method considering the uneven air-gap. This method provides a basis of the bearingless motor structure with ALIM decoupling control.

关 键 词：弧形直线感应电机 不均匀气隙 偏心 磁场计算 有限元 解析计算 

分 类 号：TM359.4[电气工程—电机]