Model-free adaptive control system of axial mixing magnetic bearing and control method thereof

Abstract

The invention discloses a model-free adaptive control system of an axial mixing magnetic bearing and a control method of the model-free adaptive control system. A model-free adaptive controller, an axial mixing magnetic bearing system control model, a generic model and an actual position estimator are connected to form a closed-loop control system. The axial mixing magnetic bearing system control model is composed of a force / current transformation and power amplification module, the axial mixing magnetic bearing, a displacement sensor and a displacement interface circuit, wherein the force / current transformation and power amplification module, the axial mixing magnetic bearing, the displacement sensor and the displacement interface circuit are in series connection in sequence. The displacement deviation of a rotor is regarded as an input variable of the model-free adaptive controller; the output control quantity of the model-free adaptive controller is adjusted according to the control law of the model-free adaptive controller; the input quantity and the output quantity of the axial mixing magnetic bearing system control model, and the output quality of the generic model are regarded as the input quantity of the actual position estimator; an estimated pseudo partial derivative is regarded as the output quantity of the actual position estimator; and the estimated pseudo partial derivative is fed back to both the generic model and the model-free adaptive controller. A complex nonlinear mathematical model does not need to be constructed, fast response can be better realized, and the calculated amount is little.

Description

technical field [0001] The invention belongs to the technical field of control, and in particular relates to a non-mechanical contact axial hybrid magnetic suspension bearing. Background technique [0002] Magnetic bearing is a kind of support bearing that uses magnetic field force to suspend the rotor in space so that it has no mechanical contact with the stator. It has the advantages of no friction, no wear, no lubrication and sealing, high speed, high precision and long life. Axial hybrid magnetic bearing is a kind of magnetic bearing in which the control magnetic flux is generated by the control coil and the bias magnetic flux is generated by the permanent magnet, so that the rotor is suspended in space. It has controllable suspension force, high precision, adjustable stiffness, low power consumption Low cost, low cost, good space heat dissipation and other advantages. [0003] At present, magnetic bearings are mostly controlled by PID controllers, but PID controllers r...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems existing in the control of the existing axial hybrid magnetic bearings, and take into account all the situations that can cause changes in the mathematical model of the axial hybrid magnetic bearing control system, thereby proposing a more robust Axial hybrid magnetic bearing model-free adaptive control system with high performance, anti-interference, adaptability and control accuracy; the present invention also proposes a control method for the axial hybrid magnetic bearing model-free adaptive control system, which does not require the controlled object Mathematical model, using the overall control model as a compound controlled object, solves the difficult problem of establishing a mathematical model, and realizes precise control

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