Research On The Active Vibration Control Technologies Of Magnetically Suspended Flywheel

Magnetically suspended inertial actuator uses supporting technology of magnetic suspension bearing.Magnetic bearings have the advantages of non-contact,non-friction,non-lubrication,low vibration and active control,which makes the magnetic levitation inertial actuator has the advantages of high precision,long life and low power consumption.Supporting technology of magnetic suspension bearing is an important direction in the development of space technology.In this paper,the high-speed rotor of Magnetically Suspended Flywheel is taken as the research object.The research target of this paper is to improve the control accuracy of magnetic suspension flywheel in space.The vibration mechanism and vibration control method of typical interference sources are studied in depth.This paper mainly completed the following aspects.A dynamic model of maglev flywheel system is established.The levitation control method of Maglev flywheel is studied.Based on the System composition and working principle of magnetic suspension flywheel system,this paper focuses on the significant links of active vibration design and establishes the dynamic models of each link respectively,which includes rigid rotor dynamic model,electromagnetic force model,and power amplifier and sensor model.On this basis,typical interference factors in practical engineering application,such as the imbalance of rotor and SR,are mainly considered.Finally,a system dynamics model for active vibration control is established.Taking practical engineering applications as the goal,a high reliable suspension controller based on PID and low pass filter is designed and then the stable suspension of the system is realized.The magnetic suspension flywheel rotor unbalance and Sensor Runout of the vibration mechanism and vibration control method are deeply studied.Rotor imbalance is the source of disturbance generated by system dynamics,While SR introduces the same frequency or multiple frequency interference by affecting the output of the displacement sensor.The vibration mechanism is different.The single control method has limited performance improvement for the system.According to the characteristics of rotor imbalance and Sensor Runout,a compound control method is proposed in this paper.The generalized notch method is used to suppress the same frequency vibration caused by rotor imbalance.Repetitive control method is used to suppress the multi harmonic vibration caused by misalignment of sensors.Repetitive controller adopts plug-in structure and the fast path of the original system command signal is retained.The two control methods are independent of each other in the design process.The stability of closed loop system is analyzed.Under the disturbance of rotor unbalance and SR,the effectiveness of the high accuracy control of magnetic suspension flywheel rotor is verified by simulation experiments.Experiments on active vibration control of magnetic suspension flywheels are carried out.Based on the integrated controller of DSP+FPGA,the designed active vibration control calculation method is applied to the actual physical system.The experimental results show that the active vibration control method restrains the harmonic disturbance of the rotor effectively.The control signal amplitude of original significant co frequency components and five times components decreased obviously,which improves the control accuracy of MSF significantly.