Method for constructing decoupling controller of five-degree-of-freedom alternating-current active magnetic bearing

Abstract

The invention discloses a method for constructing a decoupling controller of a five-degree-of-freedom alternating-current active magnetic bearing. The method comprises that a fuzzy neural network inverse system is connected in front of a composite controlled object in series to form a pseudo-linear system together, five position controllers are designed for the pseudo-linear system to form a closed loop controller, and finally, the closed-loop controller is connected in front of the fuzzy neutral network inverse system to form the decoupling controller together. The construction of the fuzzy neural network inverse system is that an inverse model of the composite controlled object is established by using the fuzzy neural network and ten first-order integrators S(-1) according to the relative order of the composite controller object, sufficient excitation is carried out on the composite controlled object by using random signals, and the fuzzy neural network is trained offline by adopting a BP algorithm. The method disclosed by the invention decouples the nonlinear strong-coupling five-degree-of-freedom alternating current active magnetic bearing into five independent second-order pseudo-linear systems, thereby enabling the system to have good control performance and a disturbance resisting ability.

Description

technical field [0001] The invention relates to a five-degree-of-freedom AC active magnetic bearing decoupling controller, in particular to a construction method of a five-degree-of-freedom AC active magnetic bearing decoupling controller, which belongs to the field of high-speed electric transmission and provides precision and high-efficiency support for high-speed rotating shafts Conditions, suitable for flywheel energy storage devices, high-performance machine tool spindles, centrifugal pumps, etc. Background technique [0002] With the development of industrial technology, the requirements for the performance of high-speed and ultra-high-speed rotating spindle support systems are increasing. However, traditional mechanical bearings have disadvantages such as mechanical friction and the need for lubricating oil. Therefore, magnetic bearings have no friction, no lubrication, and rotor displacement. The advantages of high precision and long life lead to its broad applicatio...

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Problems solved by technology

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the present invention proposes a construction method of a five-degree-of-freedom AC active magnetic bearing decoupling controller, which uses a fuzzy neural network inverse method to realize independent control among the five degrees of freedom of the AC active magnetic bearing system. Overcome the problem of control performance degradation caused by system parameter perturbation, interference, modeling errors, etc., so that the system has excellent dynamic and static characteristics

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