一种磁悬浮飞轮转子位移信号转速估计方法

Estimation Method of Rotor Speed Using Signal of Displacement Sensor in Magnetic Suspension Flywheel

针对无测速传感器条件下磁悬浮飞轮主动振动抑制所需的转速信号的高精度提取问题,首先提出了一种改进Hilbert变换转速估计方法,实现了仅通过一路转子径向位移信号获得高精度的转子转速信号;将所估计的转速信号引入磁悬浮飞轮不平衡振动控制仿真模型中,对所提出的转速估计方法进行了仿真分析;在磁悬浮飞轮样机上进行了所提出的改进Hilbert变换转子转速估计方法的验证,并对引入估计转速信号前后磁悬浮飞轮的振动信号进行了对比分析。仿真和实验结果表明,此方法在磁悬浮飞轮处于变速和恒速两种情况下都具有良好的适应性,在磁悬浮飞轮的工作转速范围内引入转速估计信号后同频不平衡振动衰减达到80%以上。

Under the condition of high-precision rotor speed signal extraction problem in magnetic suspension flywheel active vibration suppression without a speed sensor,firstly,an improved Hilbert transform rotor speed estimation method is put forward,and through this method,the rotor speed of high precision can be got with only one kind of radial rotor displacement signals; then this rotor speed signal is introduced into the simulation model of the magnetic suspension flywheel unbalanced vibration suppression,and this speed estimation method is analyzed in this simulation system; finally the rotor speed estimation method based on the improved Hilbert transform has been verified on the magnetic suspension flywheel prototype. Simulation and experimental results show that this method has good adaptability in both cases of variable and constant rotor speed,and after introducing speed estimate signal,the unbalanced vibration has attenuated by 80% or more within the working rotor speed scope of the magnetic suspension flywheel.