磁悬浮永磁直线电动机及其控制系统研究

根据磁悬浮永磁直线电动机的特殊结构与运行机理，给出了电动机电磁推力和悬浮力的数学模型。建立了磁悬浮永磁直线电动机的有限元计算模型，对气隙磁密、电磁推力和悬浮力进行了有限元计算，并对气隙磁密作了谐波分析。设计了磁悬浮永磁直线电动机的研究样机，制作了磁悬浮子系统和进给伺服子系统，对系统进行实验研究，获得了磁悬浮子系统和进给子系统运行的实验结果。实验研究结果表明，该磁悬浮永磁直线电动机可实现直接驱动与无摩擦运行。

Research on Magnetic Levitation Permanent Magnet Linear Motor and Its Control System

According to the special structure and operation mechanism of the maglev permanent magnet linear motor, a mathematical model of electromagnetic thrust and levitation force of the motor was given. The finite element calculation model of maglev permanent magnet linear motor was established. The air gap flux density, magnetic thrust and levitation force were calculated by finite element method, and the air gap flux density was carried out by harmonic analysis method. A research prototype of the maglev permanent magnet linear motor was design. The magnetic suspension subsystem and the feed servo subsystem were made. The results of the magnetic suspension subsystem and feed subsystem were obtained by experiments. Experimental results show that adopting the maglev permanent magnet linear motor can achieve the feasibility of direct drive and frictionless operation.