Dual Stator Bearingless Five-Phase Brushless DC Motor

Abstract

The invention discloses a double-stator bearingless five-phase brushless direct current motor. The outer stator yoke, the rotor iron core and the inner stator yoke are coaxially nested from the outside to the inside, and the inner peripheral surface of the outer stator yoke is along the circumferential direction. There are 10 armature teeth and 10 fault-tolerant teeth arranged in a staggered manner, and five-phase torque windings are wound on the armature teeth; 18-pole outer permanent magnets are evenly distributed on the outer surface of the rotor core. 4-pole inner permanent magnets are evenly distributed on the surface, and 6 inner stator teeth are uniformly fixed along the circumferential direction on the outer circumference of the inner stator yoke, and suspension force windings are wound on the inner stator teeth; the torque winding, outer permanent magnets, and rotor work together Realize the rotation of the motor, the suspension force winding, the inner permanent magnet, and the rotor work together to realize the stable suspension of the rotor, the torque winding and the suspension force winding are controlled independently, and the suspension force winding and the torque winding have self-decoupling characteristics, which enhance the radial Suspension ability and improve the dynamic and static performance of suspension subsystem and torque subsystem.

Description

technical field [0001] The invention belongs to the field of motors, in particular to a double-stator bearingless five-phase brushless DC motor, which is suitable for application fields requiring high reliability such as aerospace, nuclear power plants, and electric vehicles. Background technique [0002] The bearingless brushless DC motor stacks the torque winding and the suspension force winding on the stator teeth. The torque winding realizes the rotation of the motor, and the suspension force winding generates radial suspension force to realize the stable suspension of the rotor. The motor has the functions of brushless DC motor and magnetic bearing at the same time, and has the advantages of high speed, high precision, long life, no need for lubrication and sealing, etc. of magnetic bearing. The main problems of this kind of bearingless brushless DC motor are: the magnetic field generated by the suspension force winding and the torque winding interacts, it is difficult ...

AI Technical Summary

Problems solved by technology

The main problems of this kind of bearingless brushless DC motor are: the magnetic field generated by the suspension force winding and the torque winding interacts, it is difficult to achieve effective decoupling between the suspension force and torque; since the motor current is a square wave DC , the coordinate transformation control method of the traditional motor is difficult to apply to the bearingless brushless DC motor

[0003] The motor structure closest to the technology of the present invention is the traditional double-stator three-phase permanent magnet motor. Due to the inherent characteristics of the internal permanent magnets of the double-stator three-phase permanent magnet motor, its fault tolerance is limited, especially the fault caused by the winding short circuit fault. Problems such as temperature rise will cause serious systemic failure

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