Double-suspension-force bearingless asynchronous motor

Abstract

The invention discloses a double-suspension-force bearingless asynchronous motor. The double-suspension-force bearingless asynchronous motor comprises a motor rotor and a stator, the rotor is composed of a rotating shaft and a rotor iron core, 28 rotor grooves are evenly formed in the rotor iron core in the circumferential direction, and 7 pairs of closed rotor conducting bars are embedded in the rotor grooves; the stator is composed of a stator iron core and stator windings, 36 stator grooves are uniformly arranged, two layers of windings are embedded in the stator grooves, suspension force windings are arranged on the inner sides of the stator grooves, torque windings are arranged on the outer sides of the stator grooves, the suspension force windings comprise one-pair-pole main control suspension force windings and three-pair-pole auxiliary suspension force windings, and the suspension force windings and the auxiliary suspension force windings are alternately distributed and occupy the inner sides of the 18 stator grooves respectively; the torque windings are two pairs of pole centralized windings and occupy the outer sides of 36 stator slots; and a certain air gap exists between the motor rotor and the motor stator. A suspension force is not generated between the main control suspension force winding and the auxiliary suspension force winding, magnetic field decoupling of the three windings is easy, four forces can be provided through synchronous control, and the suspension precision of the bearing-free asynchronous motor is improved.

Description

technical field [0001] The invention belongs to the technical field of electric transmission control equipment, in particular to a novel 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 fields with steri...

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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