Vector control method for double-suspension-force bearingless asynchronous motor

Abstract

The invention discloses a vector control method for a double-suspension-force bearingless asynchronous motor, and the method comprises the steps: firstly building a mathematical model of the double-suspension-force bearingless asynchronous motor, which comprises a flux linkage equation, a voltage equation, a main control suspension force equation and an auxiliary suspension force equation of the motor; then, deducing equivalent rotor resistance of the double-suspension-force bearingless asynchronous motor, and optimizing a master control suspension force equation; and finally, realizing independent control of the main control suspension force, the auxiliary suspension force and the torque of the double-suspension-force bearingless asynchronous motor by adopting a vector control method based on air-gap field orientation.

Description

technical field [0001] The invention belongs to the technical field of electric drive control equipment, in particular to a vector control method for a double-suspension force bearingless asynchronous motor. Background technique [0002] With the development of modern industry, the application of motors is getting wider and wider, and its requirements are getting higher and higher. Bearingless motor utilizes the similarity between the magnetic bearing and the motor stator structure, skillfully embeds a set of suspension force windings on the ordinary motor, and controls the currents in the suspension force winding and torque winding respectively to achieve stable suspension and frictionless rotation at the same time. Compared with ordinary motors, bearingless motors have the advantages of no mechanical friction, wear, and no lubrication. They have broad application prospects in aerospace, high-speed hard drives, flywheel energy storage, biomedicine, and special electrical fi...

AI Technical Summary

Problems solved by technology

The above two decoupling methods both rely on the precise mathematical model of the motor, and the parameters of the motor will continue to change during actual operation, which directly affects the control accuracy of the above methods

At the same time, the above methods are all based on the research of single-suspension force bearingless asynchronous motors. The current is decomposed into the d and q axes, and the magnitude and direction of the motor suspension force are controlled only by changing the d and q axis currents, which is easily interfered by external factors of the motor.

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