Research And Design Of New Mixed Excitation Linear Synchronous Motor

The research on the Analysis and Design of new hybrid excitation linear synchronous motor (HELSM) is done in this thesis. This dissertation introduces the high performance permanent magnet to excitation pole. With the advantages of safer, quicker, better environment protection and saving more energy, high-speed maglev technology is very promising in middle and long distance transportation territory of China. Long state linear synchronous motor (LLSM) is critical driving device to the maglev system. HELSM has a lot of advantages because of the introduction of permanent maglev, such as more powerful magnetic field, more thrust and easy to adjust, reducing excitation current and capacity of power supply equipment, increasing air gap length, improving the practicability on engineering. The research on HELSM is very important to improve the performance of LLSM and promote the localization of maglev technology.Firstly, the finite element model of the motor was created, so the magnetic field distribution map of the motor and force characteristics were obtained with finite element analysis. The experimental results of maglev levitation test line showed the validity of the finite element model. It's useful to design and analyze HELSMs.Secondly, two new HELSMs were introduced after the analysis of the defectives of existing HELSMs. Based on the magnetic field, the functional relations between thrust, levitation force, air gap length and excitation current were obtained. The comparison results of HELSM's model with LLSM's model showed performance advantages of HELSMs. In addition, the effects of permanent size and position on normal force were investigated to supply theoretical basis for structural optimization.Finally, the dynamic d-q model of new HELSM was erected. The results of simulation of Speed Adjusting system with and without Field Weakening were obtained respectively on the basis of The Vector Control System of HELSM. The results showed that the Speed Adjusting with Field Weakening system had much better Control Effect.