无轴承异步电机转子质量偏心振动补偿控制

Vibration compensation control of rotor mass eccentric in bearingless induction motor

为解决由机械不平衡引起的无轴承异步电机转子质量偏心振动问题,提出了一种基于自适应最小均方(least-meansquare,LMS)滤波器产生振动补偿信号的控制方法。首先分析了无轴承异步电机不平衡振动产生机理,从检测到的位移信号中分离出与转速同频的振动信号分量,再利用自适应LMS滤波器产生一个与其同频同幅同相位的补偿信号去消除振动信号分量,从而达到振动抑制的目的。最后在MATLAB/Simulink工具箱中对该控制方法进行了仿真研究,并在一台试验样机上进行了实验验证。仿真和实验结果表明,所提基于LMS算法的自适应滤波器能够有效地降低转子径向振动位移的峰-峰值,并且能减小位移控制回路的电流,从而验证了所提方法的正确性与有效性。

To solve the problem of rotor eccentric mass vibration caused by mechanical imbalance of bearingless induction motor （ BIM）, a compensation control method was put forward using adaptive least-mean-square （LMS） filter to realize vibration suppression. Firstly, on the basis of analyzing the generation mechanism of imbalance vibration of BIM, the vibration signal component with the same frequen- cy of the rotation speed is separated from the detected displacement signal. Then, a compensation signal with the same amplitude, phase and frequency of the vibration signal is produced using the adaptive LMS filter to eliminate the vibration signal component, so as to a- chieve the purpose of vibration suppression. Finally, the vibration compensation control method was studied with simulation in MAT- LAB/Simulink toolbox and verified on an experimental prototype. The simulation and experiment results show that the proposed adaptive filter based on LMS algorithm can effectively reduce the peak-peak value of the rotor radial vibration displacement and the current of the displacement control loop. The correctness and effectiveness of the proposed method are verified.