A Construction Method of AC Hybrid Magnetic Bearing Decoupling Controller

Abstract

The invention discloses a construction method for a decoupling controller of an alternating-current hybrid magnetic bearing. Inputs of a combined controlled object are equivalent current expected values ix<*> and iy<*>, the outputs are displacements x and y, a fuzzy neural network inverse system is connected with the front part of the combined controlled object in series to form a second order position fake linear system together, two position controllers are designed to respectively control the displacement x and y, a displacement sensor is adopted to detect signals of the displacement x and y to respectively feed back to the two position controllers to form a closed loop controller, and finally the closed loop controller is connected with the front part of the fuzzy neural network inverse system in series to form the decoupling controller together; the fuzzy neural network inverse system comprises four integrators s<-1> and a fuzzy neural network, the displacement x and y and a first derivative and a second derivative of the displacement x and y are used as inputs of the fuzzy neural network, the equivalent current expected value ix<*> and iy<*> are used as expected outputs, a BP algorithm is adopted to train the fuzzy neural network off-line until the precision reaches 0.001. The construction method can realize the dynamic decoupling control of the outputs.

Description

technical field [0001] The invention is an AC hybrid magnetic bearing, specifically a construction method of an AC hybrid magnetic bearing decoupling controller, which is suitable for precise control of a high-speed rotor magnetic suspension support system, provides conditions for the support of an ultra-high-speed rotor, and belongs to high-speed and ultra-high-speed field of electrical transmission. Background technique [0002] Magnetic bearings use electromagnetic force to suspend the rotor in the air, so that there is no friction between the rotor and the bearing. Therefore, it has the advantages of no friction, no wear, no lubricating oil, high supporting speed, high rotor displacement accuracy, and long life. The AC hybrid magnetic bearing has three magnetic poles, and is driven by a three-phase power inverter, and the bias flux is provided by the permanent magnet. Compared with the DC magnetic bearing, the space volume of the bearing and the volume of the driving dev...

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Problems solved by technology

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a construction method of an AC hybrid magnetic bearing fuzzy neural network inverse decoupling controller, which realizes the independent and precise control between the two radial degrees of freedom of the AC hybrid magnetic bearing, and overcomes the system The problems of control performance degradation caused by parameter perturbation, modeling error, disturbance and load change make the system have excellent dynamic and static characteristics

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