Simulation Research on Permanent Magnet Linear Synchronous Motor for Vertical Movement

　　Simulation Research on Permanent Magnet Linear Synchronous Motor for Vertical Movement
　　Vertical elevator system droved by permanent magnet linear synchronous motor (PMLSM) is a new type cordless elevator, people attach importance to it increasingly because its marked excellences is distinguished from traditional lift system. Foreign scholars first conceived the idea of "Vertical lift system droved by linear synchronous motor" during 90s and in this period of time they commenced the basic and experimental research. This cordless elevator is widely used in neodymium magnets the field of elevator for tall buildings and lift system for pit. It faces fatal challenges on theoretics and technique if you want to make a horizontal running engine set up. Such challenges make this problem becomes foreland problem in field of linear motor study. Traditional lift system will happen a great change if these problems are solved, the theoretical value and the social benefits are immeasurable. Permanent magnet linear synchronous motor as the hard core of new type cordless elevator has many benefits, such as super-efficient, saving energy, doing linear movement and simple structure, convenience control, no pollution and low yawp. So far, permanent magnet linear synchronous motor as a primary drive source is one of the best subjects in this field.This dissertation analyzes and researches following problems on PMLSM for vertical movement: (1) At the circumstance of ANSOFT which is used to analyze electromagnetic field, the static calculation model of PMLSM for vertical movement is built.
　　The static characteristics of distribution of magnetic field and electromagnetic propulsive force are analyzed with finite element analysis. The results have guide meaning in PMLSM’ s optimum design and simulation calculation of dynamic characteristics.(2) In the dissertation the relative basic knowledge is introduced briefly first, then the reference frame and space vector transfer laws of the PMLSM is constructed, the mathematics model of PMLSM is built. Then the d-q synchronous coordination and the thrust equation of the PMLSM are deduced.(3) Contraposing the character of vertical lift system and uniting the mathematic model under the d-q reference frame、http://www.chinamagnets.biz thrust equation and mechanism-motorial equation, the simulation model of PMLSM for vertical movement based on SIMULINK is constructed and is masked so that it can be connected with other modules conveniently and effectively. The simulation results show that system is feasible.(4) The dissertation introduced the controlling principle and method of parameter’s regulation about PID adjustor and the modulating principle and process of modulating strategy about SVPWM. Then the models of every subsystem are given. Afterwards the model of SVPWM control strategy i_d=0 vector control system which includes speed and current double close loops is built up and realized in the SIMULINK, in addition the position-loop is introduce into system and realized too.Simulation results also show that the velocity and displacement of the mover are exact and the vector control system has favorable dynamic performances. Besides, applying simulation software to complicated system design is an available method, which can speed up the system design, increase its efficiency, and ultimately realize the system optimization.