无轴承永磁薄片电动机泵原理及控制系统设计

Principle and control system design for bearingless permanent magnet slice motor pump

针对驱动离心泵的无轴承永磁薄片电动机,基于薄片转子悬浮原理设计了该电动机驱动离心泵样机,阐述了其工作原理,给出了电磁转矩和径向悬浮力数学模型,并采用数字信号处理器TMS320F2812 DSP设计了数字控制系统硬件,开发了控制系统软件.为使控制系统调试方便,结合系统控制要求设计了人机交互控制界面对数字控制系统进行实时控制与系统重要参数的在线调试,并进行了无轴承永磁薄片电动机薄片转子径向悬浮和运转试验.试验结果表明:通过人机交互控制界面实时在线调试可快速、便捷地确定控制系统参数使数字系统达到预定目标,满足对系统的控制要求,所设计的4 kW无轴承永磁薄片电动机驱动离心泵及数字控制系统空载情况下,薄片转子转速在0～2 000 r/min范围内连续可调并能够迅速达到稳定,转子质心在平衡位置(2 000,2 000)附近振动且沿径向的偏心位移振动幅值小于80μm,系统具有优良的动、静态性能.

Since the bearingless permanent magnet slice motor（BPMSM） can be used to drive a centrifugal pump,a prototype of such a motor was designed based on slice rotor suspension principle,subsequently its operating principle was expounded,eventually the mathematical models for electromagne-tic torque and radial suspension force were presented.The hardware of digital control system for the motor was designed by using the TMS320F2812 DSP and the software for the system was developed as well.Then,a human-computer interaction interface was composed for the control system to make real-time control and online debugging more easily.The experiments on slice rotor suspension and operation were performed.The experimental results show that real-time online debugging through the human-computer interaction interface can determine controlling parameters quickly and easily to allow the system to achieve the scheduled requirements on control.The speed of slice rotor varies from 0 to 2 000 r/min continuously and can attain a stable speed soon.The rotor center of mass vibrates near the equilibrium position（2 000,2 000） and the vibration amplitude is less than 80 μm in the radical direction under no-load conditions.Thus,the prototype of 4 kW BPMSM used to drive a centrifugal pump and its digital control system has an excellent static and dynamic performance.