基于坐标变换的无轴承异步电机转子振动前馈补偿控制

Rotor vibration feedforward compensation control in bearingless induction motor based on coordinate transformation

为解决无轴承异步电机在高速运行时由机械不平衡引起的转子质量偏心问题,设计一种基于坐标变换的转子振动前馈补偿控制系统。该系统利用旋转坐标变换从位移信号中提取出振动信号,加在原有的径向悬浮力控制系统中,构成1个前馈补偿器,使得控制器给定径向悬浮力信号中同期成分控制力增大,并加大径向悬浮力控制系统对振动信号的刚度,从而强迫转子围绕其几何中心轴旋转,实现转子的振动抑制。研究结果表明:当转速为6 000 r/min时,仿真补偿后转子振动峰-峰值约为11μm,表明该补偿控制策略能很好地抑制悬浮转子的振动,提高转子旋转精度。该前馈补偿控制方法能够将转子径向位移峰-峰值范围控制在40μm以内,验证了所提方法的正确性与有效性。

To solve the rotor mass eccentric problem caused by mechanical imbalance for the bearingless induction motor at high speed, a rotor vibration feedforward compensation control system was designed based on coordinate transformation. The vibration signal was extracted from the displacement signal by rotating coordinate transformation and was added to the original radial suspension force control system. Then, a feedforward compensator was formed, which increased the given period radial suspension force component control signal and amplified the stiffness of the vibration signal of the radial suspension force control system. The rotor vibration was suppressed by forcing the rotor rotating around its geometric center axis. The results show that the compensated rotor vibration peak to peak value in simulation is about 11 μm at the speed of 6 000 r/min. The vibration of suspension rotor can be effectively restrained and the precision of rotor is improved in this control strategy. The presented feedforward compensation control method can make the peak to peak value of rotor radial displacement range within 40 μm. The correctness and effectiveness of the proposed method are verified.