Abstract
Rotor unbalance and sensor runout are the two major interference sources in magnetically suspended flywheel (MSF), which can induce undesirable harmonic vibration and reduce the attitude control precision of spacecraft. To further suppress the harmonic vibration caused by multiple interference sources, a compound control method is proposed in this paper. Firstly, the mechanism of harmonic vibration is analyzed. The rotor unbalance mainly generates the single harmonic vibration and the sensor runout generates multiple harmonic vibration. Secondly, on the basis of the characteristics of the two kinds of interference, the generalized notch filter and the repetitive control method are adopted to suppress the harmonic vibration caused by sensor runout and rotor unbalance, respectively. Thirdly, in order to reduce the difficulty of controller design, a plug-in structure is adopted to the repetitive controller. And then the two control methods can be designed independently. The stability and the interference suppression capability of the proposed method were analyzed. Lastly, the effectiveness of the proposed method has been experimentally verified.
Highlights
The momentum exchange actuator represented by flywheel is an indispensable attitude control mechanism for all kinds of spacecrafts
In order to further improve the rotational accuracy of the rotor of magnetically suspended flywheel (MSF), this paper hopes to design a compound control method using the generalized notch filter method to suppress the synchronous vibration caused by rotor unbalance and using repetitive control to further suppress the multiple harmonic vibration caused by sensor runout that can’t be suppressed by the generalized notch filter
Experimental results clearly show the proposed method significantly reduce the harmonic vibration caused by rotor unbalance and sensor runout
Summary
The momentum exchange actuator represented by flywheel is an indispensable attitude control mechanism for all kinds of spacecrafts. Zheng et al.[16] propose a feedforward compensation control method based on a novel adaptive notch filter to suppress the vibration of magnetic bearing with rotor unbalance. Due to the sensor runout, the output signal of the displacement sensor will introduce multiple harmonic components and generate current stiffness force through the controller, which is different from the rotor unbalance that only generates the single harmonic vibration. Most studies on active vibration control of MSF are carried out on the influence of rotor unbalance and the notch filter method has good control effect on the single interference source. On the basis of the above analysis, a compound control method based on repetitive control and generalized notch filter is proposed in this paper, which is used to improve the rotational accuracy of rotor.
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