Bearingless motor’s radial suspension force control based on flux equivalent with virtual winding current analysis method  

作　　者：ZHU HuangQiut CHENG QiuLiang 

机构地区：[1]School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China

出　　处：《Chinese Science Bulletin》2009年第9期1590-1598,共9页

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 50275069);National High Technology Research and Development Program of China (Grant No. 2007AA04Z213)

摘　　要：A bearingless motor has two sets of intercoupling stator windings, namely torque windings and sus-pension force windings. The decoupling control of the two sets is difficult and a key technology to stable operation for a bearingless motor. In this paper, a simple, reliable and accurate analysis method is put forward using the concept of flux equivalent with virtual winding currents. By this method, the suspension operation condition PB=PM±1 for bearingless motors is testified, and under the rotation condition of the motor, it is also proved that currents in suspension force windings must have the same phase sequence and frequency as torque windings to generate a stable single direction radial force in the rotor's whole circumference. On this basis, the control strategy of realizing the suspension opera-tion of the bearingless motor is presented, and a prototype of the bearingless surface-mounted per-manent magnet synchronous motor is tested. The research results have indicated that the experimental results correspond with theoretical analysis adopting this method, a stable and reliable radial suspen-sion force can be generated, and the validity and feasibility of this control strategy are confirmed.A bearingless motor has two sets of intercoupling stator windings, namely torque windings and suspension force windings. The decoupling control of the two sets is difficult and a key technology to stable operation for a bearingless motor. In this paper, a simple, reliable and accurate analysis method is put forward using the concept of flux equivalent with virtual winding currents. By this method, the suspension operation condition PB=PM＋1 for bearingless motors is testified, and under the rotation condition of the motor, it is also proved that currents in suspension force windings must have the same phase sequence and frequency as torque windings to generate a stable single direction radial force in the rotor＇s whole circumference. On this basis, the control strategy of realizing the suspension operation of the bearingless motor is presented, and a prototype of the bearingless surface-mounted permanent magnet synchronous motor is tested. The research results have indicated that the experimental results correspond with theoretical analysis adopting this method, a stable and reliable radial suspension force can be generated, and the validity and feasibility of this control strategy are confirmed.

关 键 词：无轴承电机 径向悬浮力 定子绕组 电流分析 径向力 虚拟 基础 力控制 

分 类 号：TM341[电气工程—电机] TH133.3[机械工程—机械制造及自动化]