Inverse system decoupling controller of five-degree-of-freedom bearingless synchronous reluctance motor

Abstract

The invention discloses an inverse system decoupling controller of a five-degree-of-freedom bearingless synchronous reluctance motor. In the inverse system decoupling controller, a linear closed-loop controller, an alpha-th-order inverse system and a composite controlled object are connected in series successively; the composite controlled object consists of three extended hysteresis current controlled PWM inverters, a switching power amplifier and the five-degree-of-freedom bearingless synchronous reluctance motor; the alpha-th-order inverse system and the composite controlled object constitute a pseudo linear system; the five-degree-of-freedom bearingless synchronous reluctance motor consists of a three-degree-of-freedom active magnetic bearing and a two-degree-of-freedom bearingless synchronous reluctance motor which share one rotor; the rotor is provided with a plurality of eddy-current sensors; and the linear closed-loop controller consists of a rotary speed controller, four radial position controllers and an axial position controller. The controller disclosed by the invention has compact structure; and by adopting the invention, the radial suspension force, axial suspension force, motor radial suspension force and electromagnetic torque of the magnetic bearing can be controlled independently and the control performance of the entire system can be effectively increased.

Description

technical field [0001] The invention relates to a five-degree-of-freedom bearingless synchronous reluctance motor inverse system decoupling controller in the technical field of electric drive control equipment, which is suitable for high-speed and ultra-high-speed motor transmission. Background technique [0002] Bearingless synchronous reluctance motors are widely used in special electrical transmission fields such as machine tool spindles, turbomolecular pumps, centrifuges, compressors, electromechanical energy storage, aerospace, etc. Compared with traditional bearingless motors, synchronous reluctance motors have many advantages : The permanent magnet is omitted on the rotor, and there is no excitation winding, the structure is simple, the operation is reliable, the cost is low, and because it can achieve a high salient pole ratio, it also has high torque density, fast dynamic response, low torque ripple, With the advantages of low loss and high power factor, it is m...

AI Technical Summary

Problems solved by technology

If the decentralized control method is used to control the system, the coupling effect between the various variables of the system is ignored, and the requirements for high-speed and high-precision operation cannot be met. The system must be decoupled to independently control the radial suspension force of the magnetic bearing, the axis Levitational force, radial levitation force of motor and electromagnetic torque

Among the commonly used decoupling control methods, vector control can only realize the static decoupling control of torque and suspension force, and its dynamic response performance is not satisfactory; although the differential geometry method can realize the dynamic decoupling of the system, it needs to solve the problem It is discussed in the geometric domain, and the mathematical tools used are quite complex and abstract; the neural network inverse control method can realize the dynamic decoupling of the system, but it needs a large amount of training sample data, the training time is long, and the controller design is complicated; while the inverse The physical concept of system theory is clear and intuitive, and the mathematical analysis is simple and clear. By linearizing and decoupling the system into independent linear integral subsystems to realize the dynamic decoupling control between each controlled variable, it can effectively improve the control of the entire system. performance

[0004] The patent application number is 200610085347.6, and the title is "Construction Method of Feedforward Compensation Controller for Bearingless Synchronous Reluctance Motor". The decoupling of the control system is carried out by using the method of serially connecting feedforward compensators in modern control theory, but the decoupling cannot be solved. The problem that the parameters in the compensator are susceptible to magnetic saturation

The patent application number is 201010117622.4, and the name is "Bearingless Synchronous Reluctance Motor Support Vector Machine Inverse System Composite Controller", which uses the Support Vector Machine Inverse System Composite Controller to perform decoupling control on the two-degree-of-freedom bearingless synchronous reluctance motor, but The support vector machine algorithm is too complex to train on large-scale samples

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