Characteristic Research On Linear Synchronous Motor

Chinese territory is vast, the better transportation system is needed with the development of society and economy. It is especially urgent to improve speed of middle and long distance transportation. As one of the greatest creations high-speed MGLEV (magnet levitation train) system is suitable to our country because of its high speed, comfort, security and no pollution. Therefore, Shanghai constructed the first commercial MGLEV system in the world, which key technology is of Germany. To this system, long stator linear synchronous motor(LLSM) is critical driving device. The research results of LLSM are important to construct the MGLEV system with ourselves early.Except the characteristic study on LLSM of MAGLEV, its' construction need to be innovated according to its' disadvantages and the motor development trend. The innovation will lower weight of power on train and improve levitation force. The most important aim is to develop a new construction belong to us. This dissertation introduces the high performance permanent magnet to excitation pole and keeps old electrical excitation winding, which is called hybrid excitation linear synchronous motor.The main content of this dissertation is as follows:In chapter 1, the background and the significance of the research are stated. The operational principle, construction style, application, development trend and current research situations of MAGLEV train and LSM are introduced, especially to LLSM and hybrid excitation LSM.In chapter 2, the construction and power supply system of LLSM is introduced, after that the equivalent circuit and electromagnetic design is concluded. Then the characteristic of LLSM in TR08 is calculated. It is useful to design and analysis of LLSM.In chapter 3, base on FEM, the parametric model of one magnetic pole module of LLSM is erected. The magnetic field is studied in detail. Base on the magnetic field, the relations between thrust, levitation force and air gap length, stator current, excitation current are obtained. Finally, the effect of magnetic pole pitch is analyzed and some parameter of equivalent circuit is obtained.In chapter 4, the novel hybrid excitation LLSM is presented according to the disadvantage of old LLSM and development trend of LSM. The design principle of this new motor is concluded. Then modern adaptive mutation particle swarm optimizer (AMPSO) method is adopted to improve the performance of old design project.In chapter 5, the hybrid excitation LLSM is analyzed by FEM, then magnetic field is calculated under different electrical excitation current. The results show the magnetic field is adjustable easily. In addition, the effect of permanent size on thrust and normal force are investigated.In chapter 6, the dynamic d-q model of hybrid excitation LLSM is erected. Baseon this, the relations between the thrust, normal force and permanent magnet, electrical excitation current are analyzed. The advantage and realization of armature id = 0 control are introduced.In chapter 7, the experiment results of prototype show the adjustable thrust and fine load capacity.In chapter 8, the study conclusions of the dissertation have been summarized.Based on these works, the dissertation achieved some creationary fruits as follows:1. Erected the parametric model under one magnetic pole module of LLSM. Based on this model, the relations between armature current and excitation current is studied. Then the thrust and levitation force are obtained including their relationship to air gap length, armature current and excitation current. In addition, the parameter of equivalent circuit is deduced. All results are benefit to master the characteristic of this LLSM.2. According to current construction of LLSM and obtaining a new construction belong to us, two novel hybrid excitation linear synchronous motors were presented. After that modern optimal method AMPSO was adopted to improve the thrust per stator current of old design project.3. Erected the parametric model of one pole of hybrid linear synchronous motor. Based on this model, the magnetic field and thrust were studied in order to prove the flexible adjustment. The effect of width and height of permanent magnet on thrust and normal force were investigated, which is useful to motor design.4. Erected the mathematic model of hybrid excitation linear synchronous motor and analyzed the armature id = 0 control strategy, then given out the realization method.