A Rotor Axially Interleaved Bearingless Flux Switching Motor

Abstract

The invention discloses a rotor axial staggered bearing-free flux switching motor, so as to optimize and improve the problem of complex suspension force control of a general bearing-free flux switching motor. A motor rotor is divided into two sections in the axial direction. Two rotors are staggered at the electrical angle of 180 degrees, and then are connected in parallel to form a whole body. A motor stator is divided into two layers in the axial direction. Two layers are the same except that magnetization directions of permanent magnets are opposite. According to the invention, the complementary characteristic of a suspension winding of the flux switching motor is used; suspension force tangential component direct current bias produced by the energized single-phase suspension winding is eliminated; the difficulty of control is greatly simplified; and sinusoidal suspension winding current is realized in the case of constant suspension force.

Description

technical field [0001] The invention relates to the field of bearingless motors, in particular to a rotor axially staggered bearingless flux switching motor. Background technique [0002] Since there is no contact between the mechanical bearings of the bearingless motor, the stator and the rotor are completely separated, and there is no problem of mechanical wear. It has special advantages in the semiconductor industry, life sciences and other fields. The permanent magnets of traditional bearingless permanent magnet synchronous motors are usually installed on the rotor, which leads to problems such as poor heat dissipation of the rotor and the risk of thermal demagnetization of the permanent magnets. In addition, for permanent magnet surface-mounted rotors, additional protection measures are usually required to protect the permanent magnets from being damaged by centrifugal force under high-speed rotational motion, which increases the difficulty and cost of processing. In a...

AI Technical Summary

Problems solved by technology

It can be seen that the sine degree of the three-phase current is relatively high, but they all contain different DC components, resulting in the asymmetry of the three-phase current

The complexity of its current solution is simpler than the method with the lowest copper consumption, but it is still much more complicated than the traditional bearingless permanent magnet synchronous motor

[0018] Both of the above two current control methods have the problems of relatively complicated current control and asymmetrical three-phase current, so they are not ideal control methods. The key reason is that image 3 There is a DC component in the levitation force component parallel to the coil shown in

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