A method for suppressing unbalanced vibration of magnetic levitation spherical flywheel

Abstract

The present invention relates to a magnetic suspension spherical flywheel imbalance vibration inhibition method. The Newton's second law and the gyro technique equation are employed to establish a magnetic bearing-rotor dynamics equation, based on the D'Alembert's principle, the disturbing force of imbalance mass moment on a rotor caused by deviation of rotor inertial axis from a geometrical axis, the disturbing force of the eccentricity on the rotor caused by the deviation of the rotor mass center from the geometrical axis and the disturbing force of the deflection negative moment on the rotor caused by suspension force passing through the rotor centroid and not passing through the rotor mass center are obtained. Rotor displacement amounts under the three disturbing forces are converted to the displacement amount under a sensor coordinate system and the displacement amount under a magnetic bearing coordinate system through a conversion matrix, the two displacement amounts are respectively acted in the controller and the magnetic bearing, and the feedforward inhibition method is employed to perform inhibition of the three disturbing forces. The magnetic suspension spherical flywheel imbalance vibration inhibition method can effectively improve the control precision of the imbalance vibration of the magnetic bearing-rotor system.

Description

technical field [0001] The invention relates to a method for suppressing unbalanced vibration of a magnetically suspended spherical flywheel, which is suitable for unbalanced vibration control of a magnetically suspended spherical flywheel with a spherical rotor structure. Background technique [0002] Mechanical bearings have problems such as friction and wear and unbalanced vibration, which cannot meet the high precision and long life requirements of the spacecraft attitude control system. The magnetic levitation flywheel uses magnetic bearings for non-contact suspension support, which eliminates the friction and wear of mechanical bearings, has active vibration control and suppression functions, and can meet the needs of high-precision and long-life spacecraft attitude control systems. The air gaps of the magnetic poles of the existing magnetic levitation flywheels are cylindrical shell, conical shell or thin-walled. When the rotor is deflected, the shape of the air gap o...

AI Technical Summary

Problems solved by technology

The magnetic levitation spherical flywheel has a spherical rotor structure. Limited by the machining accuracy of the rotor, the center of mass of the rotor deviates from the center of the rotor sphere, resulting in eccentricity of the rotor. Due to the magnetic flux leakage in the radial / axial magnetic bearing, the magnetic density at the edge of the deflection magnetic bearing is uneven. Rotor eccentric moment, the rotor does not rotate around the geometric axis, the rotor will be affected by the disturbance force, and at the same time it will reduce the uniformity of the stator air gap and reduce the control accuracy of the magnetic levitation spherical flywheel, so the eccentricity cannot be ignored

In addition, because the uniformity of the mass distribution of the rotor itself cannot be guaranteed, there is an unbalanced mass in the rotor, which causes the rotor inertial axis to deviate from the geometric axis, causing unbalanced mass moments, and causing unbalanced vibration of the rotor. The disturbance of the rotor by the unbalanced mass moment caused by the eccentric moment of the rotor and the deviation of the rotor inertial axis from the geometric axis

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