动力磁悬浮轴承转子位移检测系统

A Rotor Displacement Detection System for Power Magnetic Bearing

针对动力磁悬浮轴承转子差动式测量位移信号繁多,并占用大量的DSP A/D输入端口且使DSP计算量增大等问题,设计出一种简单的硬件电路,实现了转子中心位移变化量的计算及偏移方向的判断,节省了DSP控制系统中的I/O端口,提高了DSP的运算速度。设计出抗混叠滤波电路,解决了位移信号采样过程中出现的信号混叠,提高了系统的抗干扰能力。针对系统工作过程中由于温升而引起位移传感器的温漂问题,提出基于软件的温度补偿方法。所设计的位移运算电路输出值与理论输出值的平均误差小于1.52%,电压调理电路输出值与理论输出值的平均误差小于0.49%。

A new simple hardware circuit is designed for differential measurement of rotor displacement.The circuit can calculate the displacement variable quantity of the rotor, judge the rotor moving direction, reduce the number of I/O ports in DSP control system and improve DSP operating speed. An anti-aliasing filter circuit is also designed, which not only solves the problem of signals aliasing during the displacement signal sampling process but also im- proves the system anti-interference capacity. In addition, as temperature rising will cause temperature drift of dis- placement sensors during the system working process, a method of temperature compensation based on software is put forward. The average error of actual output value from theoretical output value for the displacement operation circuit is less than 1.52%, and the average error of actual output value from theoretical output value for the voltage adjusting circuit is less than 0.49%.