无轴承永磁同步电机转子初始定位策略

为解决无轴承永磁同步电机(BPMSM)快速稳定启动的问题,提出了一种基于指令电流控制的转子初始定位方法.给出了BPMSM悬浮原理;分析了BPMSM实现准确转子初始定位的充要条件,初始定位中定位步距角的确定,初始定位的定位相序优化,同时确定了120°→240°→0°的BPMSM初始定位相序,并在BPMSM数字试验平台上进行了空载三步定位试验,给出了试验波形.结果表明:基于指令电流控制的初始定位方法可使定位精度控制在-1°～1°范围内,定位角度值最小分辨率为0.2°,电机转子的径向位移被控制在200μm之内,能准确地完成无轴承永磁同步电机转子的初始定位,确保电机快速稳定启动.

Initial rotor orientation strategy of bearingless permanent magnet synchronous motor

To realize rapid steady starting of bearingless permanent magnet synchronous motor(BPMSM),a new initial rotor orientation method was proposed based on command current control.The suspension principle of BPMSM was given to analyze the necessary and sufficient conditions of achieving accurate position.The step angle and the positioning phase sequencer in initial orientation were optimized to identify 120° to 240° and to 0° initial orientation phase sequence.The experiments of three steps initial orientation without load were completed on BPMSM digital test rig to achieve the test wares.The results show that the orientation accuracy is controlled at the range of-1° to 1° with minimum location resolution angle of 0.2° and with motor radial displacement under 200 μm.The initial rotor orientation of BPMSM can be realized by the proposed strategy with rapid steady starting.