Rotor magnetic circuit independent hybrid pole synchronous motor

Abstract

The invention discloses a rotor magnetic circuit independent hybrid magnetic pole synchronous motor, which comprises a casing, a stator and a rotor arranged in the casing. The electric excitation S pole and the electric excitation N pole on the rotor extend axially toward different sides respectively, and are assembled on the circular electric excitation S pole pole piece and the electric excitation N pole pole piece fixed on the rotating shaft. The outer edges of the electric excitation S pole piece and the electric excitation N pole piece are respectively provided with an excitation winding bracket fixed on the end cover, and a set of excitation windings is fixed on the excitation winding bracket. In the present invention, the magnetic field is adjusted through the axial magnetic circuit composed of the end cover, the casing and other components. The permanent magnet magnetic circuit and the electric excitation magnetic circuit of the present invention are independent of each other, neither a series magnetic circuit nor a parallel magnetic circuit, so that the magnetic adjustment is convenient, and at the same time, the risk of demagnetization of the permanent magnet magnetic steel is avoided. The present invention is a brushless excitation scheme with reliable structure. In addition, the DC excitation method is adopted, the control is simple, the bidirectional excitation can be realized, and the magnetic field adjustment range of the electric excitation magnetic pole is wide.

Description

technical field [0001] The invention relates to a permanent magnet motor, in particular to a mixed magnetic pole synchronous motor with an independent rotor magnetic circuit, which belongs to the field of synchronous motors. Background technique [0002] With the improvement of performance and price reduction of permanent magnet materials, the use of permanent magnet materials in motors is becoming more and more extensive. Permanent magnet motors have the advantages of high power density, small size, light weight, high efficiency, brushless, and simple structure. All countries in the world have invested a lot of manpower and material resources, and many permanent magnet motors with new structures have appeared. The air-gap magnetic field of the main pole of the permanent magnet motor cannot be adjusted or is relatively difficult. However, when the permanent magnet motor is used as a generator, the change of the armature current or the change of the speed caused by the load ...

AI Technical Summary

Problems solved by technology

[0004] Hybrid excitation motors, especially brushless excitation hybrid excitation synchronous motors, generally have a radial magnetic circuit and an axial magnetic circuit. The representative one is the rotor pole split hybrid excitation synchronous motor proposed by the British scholar E.Spooer. The electric excitation magnetic circuit passes through the stator casing, and the axial magnetic circuit is long; the other is the rotor magnetic shunt hybrid excitation synchronous motor, and the axial magnetic circuit passes through the N-pole yoke extension body, the S-pole yoke extension body and the conductor of the rotor. The magnetic bridge has a simple structure, but on the rotor, the electric excitation and the permanent magnet are parallel magnetic circuits, which affect each other during the magnetic adjustment process, and the coupling degree is high

Images