单绕组混合定子磁悬浮开关磁阻电机的基本特性分析

Analysis of the Basic Characteristics of a Single-Winding Hybrid-Stator Bearingless Switched Reluctance Motor

针对传统磁悬浮开关磁阻电机中存在的悬浮力与转矩有效工作区域互相牵制的问题,研究一种宽-窄极混合定子的单绕组磁悬浮开关磁阻电机.首先从基本结构、运行原理、磁力特征等方面,将其与传统的单、双绕组磁悬浮开关磁阻电机进行比较,说明其悬浮力绕组和转矩绕组具有较好的独立性,可以提高悬浮力性能、降低转子悬浮控制的难度.然后基于麦克斯韦应力法建立悬浮力和转矩的数学模型,并以此为基础设计控制算法,所提方案通过仿真以及样机试验验证.可为电机本体优化设计以及控制策略研究提供较准确的理论依据,并且增加控制方法选择和研究的灵活性.

In traditional bearingless switched reluctance motors （BSRM）, consideration must be given to winding conduction area choice so that both radial force and torque can be produced effectively, which imposes a severe constraint on the study of control methods. In order to address this problem, a single-winding hybrid-stator bearingless switched reluctance motor （HSBSRM） is studied in this paper. Firstly, the basic structure, the running principle, and the electromagnetic force characteristics are compared with those of traditional single-winding and double-winding BSRMs. The independence of radial force winding and torque winding can be enhanced, and the performance of radial force can be improved as well, which is positive for suspension control. Then the mathematic model for radial force and torque are computed based on Maxwell stress method, and the corresponding control algorithms are designed, which are both verified by simulations and experiments. It can provide more sound theoretical bases for optimal motor design and control strategy study. And the choice and study of control methods are more flexible.