含有交流励磁调节器的新型磁通可调式永磁同步电动机基础理论和运行机制

恒功率运行速域窄是永磁同步电动机的缺点之一。现有的混合励磁调磁技术可在一定程度拓宽电机的速度范围，但调磁效率较低，不同程度降低了电机的功率密度。项目提出一种交流混合励磁调磁新思路，创造性地提出了含有交流励磁调节器的新型磁通可调式永磁同步电动机，发明了形式新颖的交流励磁调节器动态调节磁通，揭示了全新交流调磁模式下永磁电机的磁通调节和弱磁运行机制，研究交流励磁调节器与定子磁路的电磁耦合作用，提出电机和交流励磁调节器的最佳匹配运行模式，研究在交流励磁调节器作用下电磁参数变化对输出功率、调磁特性的影响规律，分析电机结构参数、电磁参数与逆变器参数的内在联系，剖析电磁功率密度和恒功率调速比矛盾限制因素，旨在提高磁通调节效率的同时，兼顾电机的功率密度，提升永磁同步电动机在宽运行速域的综合力能输出品质。

Permanent Magnet Synchronous Machine(PMSM) is subject to small constant power speed ratio. The constant power speed ratio can be improved by hybrid excitation flux adjustable which currently employs DC flux regulation technique. The DC flux regulation technique can reasonably enhance the constant power speed ratio. However, it suffers from poor efficiency and low power density. .This project aims to propose a new concept of flux regulation pattern called hybrid excitation AC flux adjustable approach as well as a new machine topology with independent AC flux regulator to dynamically adjust the flux of PMSM. The principle of the proposed AC flux regulation including flux adjustable mechanism, operation mode, magnetic coupling effect of stator and flux regulator and the cooperation of them under different operation circumstances. Also, the machine topology, geometric dimensions, electro-magnetic parameters and inverter capacity are intensively investigated in this project. The purpose is to have a deep insight into the compromise between the constant power speed ratio and power density, gaining the reasonable solution to broaden the constant power speed region taking the efficiency and power density into account. Through the implementation of this project, we focus on the notable improvement of comprehensive performance of PMSM including efficiency, power density and flux regulation ratio, thus providing theoretic and technical fundamentals to PMSM which demands wide speed region with constant power application.