内插式永磁型无轴承电动机悬浮力模型及其关键参数萃取

为计及内插式永磁型无轴承电动机直交轴电感差异对悬浮运行的影响,实现转子凸极效应下的稳定悬浮运行控制,提出一种建立悬浮力精确模型及其关键参数萃取的新方法。该方法从内插式永磁型无轴承电动机运行原理出发,基于磁场能量方法,建立计及转子凸极影响和定、转子定位偏心的磁悬浮力解析模型。针对模型参数是悬浮力控制及电动机悬浮运行的关键,深入分析该模型中关键参数的获取机理,并通过有限元磁场分析方法实现可控悬浮力和单边磁拉力计算中的参数萃取。在此基础上采用所获取的参数建立内插式永磁型无轴承电动机的有效控制策略,悬浮运行的仿真结果验证参数萃取方法的正确性。

ANALYTICAL MODELING AND PARAMETER EXTRACTION OF THE MAGNETIC LEVITATION FORCE FOR AN INSET PERMANENT MAGNET TYPE BEARINGLESS MOTOR

In order to consider the influence on the suspension operation of the inductance difference between direct and quadrature axis in an inset permanent magnet type bearingless motor, a new approach is proposed to realize analytical modeling of the suspension force and its parameter extraction to implement the stable suspension with the rotor saliency. Based on the operation principle of the inset permanent magnet type bearingless motor and the magnetic energy approach, a relatively accurate analytical expression of the magnetic levitation force is established with the rotor saliency effect and the eccentricity in the location of stator and rotor taking into consideration. As the parameter of the levitation force model is the key to control the suspension force and realize the stable suspension operation, the extraction principle of the key parameter is studied, and is realized by the finite element method. Moreover, the control system of the inset permanent magnet type bearingless motor is developed based on the parameters extracted, and then, the simulation result of the suspension operation validate the accuracy of the parameter extraction method.