Method for designing precession cross parameter of magnetic levitation high speed rotor

A high-speed rotor and magnetic levitation technology, applied in general control systems, control/regulation systems, instruments, etc., to ensure the precession stability margin and simplify the precession cross controller.

Inactive Publication Date: 2008-05-21
BEIHANG UNIV
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Problems solved by technology

[0005] The technical solution of the present invention: Aiming at the particularity of precession, a precession cross parameter design method based on the negative frequency Nyquist curve...

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  • Method for designing precession cross parameter of magnetic levitation high speed rotor
  • Method for designing precession cross parameter of magnetic levitation high speed rotor
  • Method for designing precession cross parameter of magnetic levitation high speed rotor

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Embodiment Construction

[0012] Taking a magnetic levitation rotor system as an example to illustrate the specific implementation of the method of the present invention, the design target is F rmax = Precession modal phase angle margin reaches γ at 400Hz p = 20°.

[0013] The definition of the maglev closed-loop rotor system and its coordinate system is shown in Figure 1. The system consists of a displacement sensor, a controller, a power amplifier, an electromagnet, and a rotor. oxyz is the rotor coordinate system. Point o is located at the center of mass of the rotor. To and only follow the radial rotation of the rotor without following the rotation, and the z-axis is along the axial direction of the rotor. α and β are the angular displacement of the rotor radially around the x and y axes, and Ω is the rotation speed of the rotor. In the figure, only the electromagnets in the y direction at both ends of the rotors A and B are drawn, and the x direction is similar. For each degree of freedom of th...

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Abstract

A method for designing the precession crossover parameters of the maglev high-speed rotor system, establishing the complex coefficient dynamic model of the maglev closed-loop rotor system, drawing the negative frequency Nyquist curve of the complex coefficient open-loop transfer function at the highest speed and calculating the low-pass cut-off frequency of the precession crossover , and then determine the correction target at the highest speed according to the phase angle margin requirements of the precession mode, search the design frequency and determine the precession cross gain at the highest speed, and then determine the precession cross gain in the entire speed range to ensure that the rotor advances The phase angle stability margin in the whole speed range realizes the robust and stable design of precession cross feedback. Based on the negative frequency Nyquist curve, the present invention proposes a method for designing the precession cross parameters of the maglev high-speed rotor system from the phase angle margin. Compared with the usual multivariable system design method such as the state space analysis method, it is not only very intuitive, but also has good robustness. Rod, so it is more suitable for use in centrifuges, high-precision CNC lathes, turbines, energy storage flywheels, and practical magnetic suspension high-speed rotor systems such as magnetic suspension flywheels and magnetic suspension control torque gyroscopes.

Description

technical field [0001] The invention relates to a method for designing precession cross parameters of a magnetic levitation high-speed rotor system, which can be used for the design of precession cross parameters of the magnetic levitation rotor system. Background technique [0002] Compared with traditional mechanical ball bearings, magnetic bearings have outstanding advantages such as non-contact, active controllability of stiffness and damping, so there is no friction and wear, and no lubrication is required, allowing the rotor to rotate at high speed, with small vibration and high support accuracy, especially suitable for ultra- Clean environment equipment, high speed equipment and aerospace equipment requiring low vibration, high precision and long life. At present, the magnetic levitation high-speed rotor system has been increasingly widely used in civil and aerospace equipment such as centrifuges, high-precision CNC lathes, turbines, energy storage flywheels, magnetic...

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Application Information

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IPC IPC(8): G05B13/04
Inventor 魏彤房建成韩邦成陈冬刘刚孙津济
Owner BEIHANG UNIV
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