A bearingless motor for electric vehicle flywheel energy storage

Abstract

The invention discloses a bearingless motor for electric-vehicle flywheel energy storage. Four outer stator teeth are evenly distributed along the circumferential direction of the inner wall of an outer stator, and each outer stator tooth is wound with a suspending winding; a fan-shaped magnetic isolation layer is fixedly and fully attached to the surface of the inner wall along the outer stator between the every two outer stators; an inner stator is fixedly attached to the position of the center of the inner surface of each fan-shaped magnetic isolation layer, the radial section of each inner stator is structured to be E-type, each of two ends and the center of the inner stator is provided with an inner stator tooth, and the inner diameter of each outer stator tooth is equal to that of the inner stator tooth; a permanent magnet is embedded in the yoke of the inner stator right in the middle of the every two inner stator teeth, each permanent magnet is magnetized tangentially, the magnetizing directions of the two permanent magnets on the two inner stators are opposite, the inner stator tooth in the center of each inner stator is wounded with the torque winding, the magnetic field of the torque windings and the magnetic field of the suspending windings are mutually separated in the inner and outer stators, and coupling degree of the torque windings and the suspending windings is quite low.

Description

technical field [0001] The invention relates to a structure of a bearingless motor, which is suitable for the special field of a flywheel battery of an electric vehicle. Background technique [0002] Electric vehicles have good comfort, little environmental pollution, and renewable electric energy, but the chemical batteries used in electric vehicles have low service life, short cruising range, and certain pollution to the environment. Come a lot of questions. In recent years, flywheel batteries using physical energy storage have broad application prospects due to their advantages such as long life and no pollution to the environment. However, the internal mechanical bearings of the traditional flywheel battery will suffer from mechanical wear when the flywheel rotates at high speed, which will cause problems of heating up and reducing the efficiency of the flywheel battery. [0003] Bearingless motor is a new type of motor that combines the functions of magnetic bearing a...

AI Technical Summary

Problems solved by technology

The development of bearingless motors with this structure is relatively mature, but there are also the following problems: the internal torque winding of the bearingless motor is coupled with the suspension winding, and the suspension force will be affected by the torque winding, which makes it difficult to control the suspension force

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