Stator-flux oriented inverse decoupling control system of bearing-free asynchronous motor

Abstract

The invention discloses a stator-flux oriented inverse decoupling control system of a bearing-free asynchronous motor. The stator-flux oriented inverse decoupling control system comprises a stator-flux oriented original system, a stator-flux oriented inverse system and four regulators, wherein the four regulators comprises a rotation speed regulator, a flux regulator and two displacement regulators; the stator-flux oriented inverse system is connected in front of the stator-flux oriented original system in series, so that the system is decoupled into four linear subsystems comprising a first-order rotation speed subsystem, a first-order stator-flux subsystem and alpha and beta radial displacement second-order subsystems; the four linear subsystems are connected with the four regulators correspondingly; the four regulators are connected to the stator-flux oriented inverse system so as to form an enclosed loop control system. According to the system, on the basis of stator-flux oriented control of a torque system, the system of the bearing-free asynchronous motor is subjected to integral inverse system decoupling control, so that the control performance of the motor is effectively prevented from being affected by rotor parameters, and the motor running control performance is improved.

Description

technical field [0001] The invention relates to the technical field of AC motor drive and control, in particular to a high-performance dynamic decoupling control method and system for stator flux oriented control (SFOC) of a bearingless asynchronous motor. Background technique [0002] Bearingless motor is a new type of motor suitable for high-speed operation developed in recent years, and has broad application prospects in aerospace, material sealing transmission, advanced manufacturing and other fields. Bearingless asynchronous motor is a multivariable, nonlinear and strongly coupled complex control system, in which there is a complex nonlinear electromagnetic coupling relationship. To achieve its high-performance suspension operation control, the motor speed, flux linkage and two rotor diameters must be realized. The dynamic decoupling control between the displacement components; the inverse system method is an effective means for linear decoupling of multivariable and no...

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a bearingless asynchronous motor stator flux oriented control inverse decoupling control system, using the stator flux oriented control to replace the traditional torque system rotor flux oriented control, the technical problem to be solved is to effectively avoid The influence of the rotor parameters on the control performance of the motor during the operation of the bearingless asynchronous motor in the prior art, the dynamic decoupling of the bearingless motor system into four (pseudo) linear subsystems, and the allocation of appropriate regulators for each linear subsystem, improve the control performance of the motor. Operation Control Performance of Bearing Asynchronous Motor

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