Novel three-DOF (degree of freedom) permanent magnet type bearing-free motor

Abstract

The invention discloses a novel three-DOF (degree of freedom) permanent magnet type bearing-free motor. The motor comprises a rotor and a stator, wherein the rotor consists of a rotating shaft and a rotor core, and rotor permanent magnets are mounted on the external circumference of the rotor core; the stator comprises stator cores, outer magnetic isolating rings and axial suspending windings which are sequentially connected outwards in the radial direction of the rotor core as well as axial control iron cores and two stator permanent magnetic rings which are symmetrically arranged on two sides of the stator cores; outer edges of the axial control iron cores are in butt joint, inner edges extend along the rotor core, and axial working gaps are formed in the inner edges; the same poles of the two stator permanent magnetic rings are opposite, the outer walls of the stator permanent magnetic rings are connected with outer isolating rings, and the inner walls of the stator permanent magnetic rings are connected with inner isolating rings respectively; radial working gaps are formed between the stator cores and the rotor cores, and the stator cores are wound with motor torque windings and radial suspending windings located on the inner layers and the outer layers respectively. No coupling exists between torque and suspending force, and the motor is simple to control and easy to implement.

Description

technical field [0001] The invention relates to the technical field of bearingless and magnetic levitation motor manufacturing, in particular to a novel three-degree-of-freedom permanent magnet bearingless motor. Background technique [0002] Bearingless and magnetic levitation motors are new high-speed special motors developed in the late 1980s. Bearingless motors are mainly divided into three types: reluctance type, induction type and permanent magnet type. Compared with the other two types, permanent magnet The type bearingless motor adopts the permanent magnet structure of the rotor, which has the advantages of no need for excitation, high power density and torque density, and simple control. It is a kind of bearingless motor with the most industrial application prospects. There are three magnetic fields inside the traditional permanent magnet bearingless motor, namely, the magnetic field of the torque winding, the magnetic field of the suspension winding and the magneti...

AI Technical Summary

Problems solved by technology

Axial magnetic bearings will inevitably increase the axial length of the levitation motor system, thereby reducing the critical speed and power density

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