Control System Design Of Drive Motor And Magnetic Bearing For The New Magnetic Suspension Gyro Flywheel

Due to the contact between stator and rotor,traditional mechanical flywheels have the deficiency of large friction,high power consumption,short life and large noise.The deficiency of traditional mechanical flywheels is overcomed by the magnetic suspension flywheel.It also has the advantages of active vibration control and vibration suppression.The high-speed rotor of the magnetic suspension frame flywheel is deflected by deflection magnetic bearing,and the high torque is output by the way of changing the direction of the rotor speed,which drives the spacecraft platform to move quickly.The new type of magnetic suspension gyro flywheel has the function of a large control torque output and attitude sensitivity at the same time.The high-speed rotor precession is made by a deflection magnetic bearing,and output large torque.It can alse use the deflection magnetic bearing to compensate disturbance torque and sense the attitude of the spacecraft.The drive system of the new magnetic suspension gyro flywheel and the control system of the magnetic bearing are the guarantee of its high-precision torque output and attitude sensitivity.The advantages and disadvantages of the controller will directly affect the operating state of the new magnetic suspension gyro flywheel.The operating state of the new magnetic suspension gyro flywheel is affected directly by the advantages and disadvantages of the controller.This paper takes the new magnetic suspension gyro flywheel as the research object,designs the drive motor and magnetic bearing control system of the new magnetic suspension gyro flywheel,and conducts in-depth research from four aspects.The drive motor and magnetic bearing control system of the new magnetic suspension gyro flywheel is designed,and conducts in-depth research from four aspects.(1)The overall structure of the new magnetic gyro flywheel is introduced.The structure of the new magnetic suspension gyro flywheel has a great influence on the performance of the control system.The magnetic bearing and the driving motor are introduced in detail as the controlled object,and the working principle is explained and the control model is set up to make the paving for its high precision drive.(2)Aimming at the high precision speed control of the new magnetic suspension gyro flywheel,the source of the speed error is analyzed in two aspects,one is the structure of the motor and the two is the commutation of the motor.The emphasis is on the analysis of the error caused by the structure of the body.A magnetic steel correction scheme based on magnetic field measurement is proposed,and a magnetic field uniformity measurement device based on Holzer's principle is designed.Finally,magnetic field measurement experiments were carried out on the built device.The experiment shows that the device can measure the uniformity of the magnetic field,and has a good reference effect on the assembly of the motor magnetic steel.It has important engineering value and can improve the precision of the driving motor.(3)Aiming at the wide speed range and high accuracy requirement of high-speed drive motor,a speed adjustment algorithm based on fuzzy adaptive PI controller is proposed.A new type of magnetic suspension gyro flywheel drive motor is taken as the object.A set of motor drives with DSP as the control core is designed.The schematic design and PCB wiring of the driver are completed.Finally,the motor speed control code is written,and the speed regulation is realized on the designed driver.The analysis of the hall signal and the anti electromotive force waveform is carried out.The result shows that the driver and the algorithm can realize the motor speed control better.(4)The magnetic bearing control system is a multi channel and high integrated control system,however,due to the limited resources,the single DSP cannot meet the control requirement.Therefore,according to the actual needs,A kind of integrated and low power magnetic bearing digital control system based on DSP+FPGA configuration is designed,and the PCB routing is completed.The overall structure of the magnetic bearing control system is to read the position signal of the rotor displacement sensor by the control chip,and the position of the rotor is obtained,digital quantity is output,and the D/A chip control of the voltage is output,and complete the position closed loop after the amplifier is amplified by linear amplifier.Among them,FPGA is responsible for the whole timing control,the A/D chip is draven by the FPGA,and the position closed loop algorithm of the magnetic bearing control is completed by DSP.Finally,the control system of the magnetic bearing is completed and tested.