新型混合励磁直线同步电机的研究与设计

【作者】 刘壮；

【导师】 方攸同；

【作者基本信息】 浙江大学 ， 电机与电器， 2008， 硕士

【摘要】 本文的研究对象是新型混合励磁直线同步电机,它是在传统电励磁直线同步电机中引入高磁能积永磁体而形成的。高速磁浮列车以其安全、快速、环保和节能等诸多优点,在我国的中长距离交通运输领域具有广泛的应用前景。长定子直线同步电机是磁悬浮列车的核心技术之一,而混合励磁直线同步电机由于引入了永磁体,减小了励磁损耗和励磁系统发热,增大了悬浮气隙,使得系统制造精度要求和造价降低,且提高了系统经济性和可靠性。因此对混合励磁直线同步电机的研究有助于提高长定子直线同步电机的性能,促进磁浮技术的国产化。本文所做的工作包括:首先,通过传统电励磁直线同步电机的有限元模型的建立和分析,得到其磁场分布和力特性,而卧龙磁浮试验线的试验结果则证明了仿真模型的正确性和有限元分析方法的可行性,为后面的分析打下了基础。接着,在对现有混合励磁直线同步电机的结构进行比较分析的基础上,提出了两种新型混合励磁电机结构,研究了其悬浮力、电磁推力与悬浮气隙、励磁电流之间的函数关系,证明了混合励磁电机比传统电励磁结构电机性能上的优越性。而后研究了永磁体尺寸与位置对新型混合励磁电机力特性的影响,为电机结构的进一步优化提供了理论依据。最后,建立混合励磁直线同步电机的学模型,通过建立HELSM的矢量控制系统整体模型的建立,分别对有无弱磁调速情况进行了仿真分析,最后分析由结果波形的比较得出,加弱磁调速后的矢量控制系统对混合励磁直线同步电机的控制是具有较好的效果。更多还原

【Abstract】 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.更多还原