单边直线感应电机纵向边缘效应的研究  

Research on the Longitudinal End Effect of Single Linear Induction Motor

作　　者：徐伟[1] 孙广生[1] 

机构地区：[1]中国科学院电工研究所

出　　处：《中国工程科学》2007年第3期21-27,共7页Strategic Study of CAE

摘　　要：单边直线感应电机(SLIM)因结构简单牢固,直接产生前进的电磁推力,在交通中得到广泛应用。由于其磁路断续,电机运行中存在横向和纵向边缘效应;次级的入口和出口因气隙磁链守恒原理会产生涡流,并随速度上升而加大。边缘效应和涡流大小对直线电机气隙磁链产生重要影响,造成气隙有效磁通和牵引力系数降低。探讨直线电机工作特点,得到了电机d-q轴等效电路,通过d轴互感和电阻变化来实时反应第二纵向边缘效应和次级涡流的影响。结合旋转电机转子磁场矢量控制方法,建立了对应的SLIM控制方程。采用转子磁链、速度和电流三个调节器,提出了uds,uqs,iqs实时在线解耦补偿控制方法,对SLIM的推力、d-q轴电压、d-q轴磁链等进行调节和控制,对d轴互感大小进行限制。结果表明,该方法在电机速度突变时减小了力矩脉动,定子电流过渡平滑,速度平稳,改善了SLIM的运行性能,为电机实际运行分析提供了理论依据。The SLIM has been widely applied in transportation for its simple-firm structure and its directly forward electromagnetic thrust. Because of its discontinuous magnetic circuit, the motor has transverse and longitudinal end effects. There are eddy currents, which become greater as motor spread increases, occurring in both entrance and exit of its secondary side for magnetic flux balance. End effects and eddy currents bring ill impact to air gap magnetic flux which reduce its available magnetic flux of air gap and pull coefficient. This paper describes particular discussions on the SLIM working characters and works out the d - q axis equivalent circuits. The changes of mutual inductance and resistance in d axis indicate both the second longitudinal end effect and the eddy current influences. Then the article establishes SLIM control equations connected with the rotor-flux oriented （RFO） vector control theory in rotary motor. The paper brings forward uds, uqs, iqs online decouple compensation based on the rotor magnetic flux, speed, current regulators, which adjust and accommodate pulsive force, d - q axis voltages, d - q magnetic fluxes, d axis mutual inductance. The result indicates that this method reduces the torque ripple and makes the stator currents flat, speed smooth during the sudden change in motor speed of no load, which provides theory guidance to the SLIM application analysis and achieves some active effects.

关 键 词：单边直线感应电机 转子磁场定向控制 边缘效应 解耦 补偿 

分 类 号：TM359.4[电气工程—电机]