Modal decoupling decentralized control method used for magnetic bearing

Abstract

The invention provides a modal decoupling decentralized control method used for a magnetic bearing. The method comprises steps of 1: decoupling gyroscopic coupling of a magnetic bearing; 2: performing opposite angle items compensation on a differentiation element, a proportion element and an integration element; and 3: compensating positive angle items introduced by a differentiation coupling compensation controller, a differentiation coupling compensation controller and an integration coupling compensation controller. According to the invention, while gyroscopic effects of a rotator are restrained, modal coupling of a system can be compensated, so control on modal quantity of the rotator is achieved and stability of the system is improved; compared with the traditional PID control method, the cross feedback control and the linear quadratic type control, the modal decoupling decentralized control method is not affected by rotation speed of the rotator of a magnetic bearing, and the gyroscopic effects in the system can be well decoupled.

Description

technical field [0001] The invention relates to a control method for a magnetic bearing, in particular to a mode decoupling decentralized control method for a magnetic bearing. Background technique [0002] Due to the limitations of the manufacturing process and the requirements of practical applications, the size of the magnetic bearing system is usually asymmetric with respect to the center of mass of the rotor. If the magnetic bearing rotor system is designed to be symmetrical about the rotor mass center in terms of geometric dimensions, the system cannot be called a parametric symmetric system in a strict sense. Satisfying the system conditions of symmetric parameters also includes the symmetry of the bearing stiffness, because the system stiffness is related to parameters such as air gap permeability, number of winding turns, and air gap length at the balance point, and is affected by thermal expansion, uncertain length of the air gap at the balance point, etc. Therefo...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing decentralized cross-feedback control of magnetic bearings cannot effectively suppress the gyro coupling existing in the parameter asymmetric system

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