Magnetic shunt and hybrid pole type synchronous motor

Abstract

The invention discloses a magnetic shunt and hybrid pole type synchronous motor which comprises a housing, a stator and a rotor, wherein the stator and the rotor are arranged in the housing; electro-magnetic N poles on the rotor extend along one axial end of the rotor in a horn-shaped manner, and are gathered at a circular electro-magnetic N pole shoe; electro-magnetic S poles extend along the axial end of the rotor in a bottleneck-shaped manner, and are gathered at a circular electro-magnetic S pole shoe; an excitation bracket, in which an excitation winding can be embedded, is arranged between the circular electro-magnetic N pole shoe and the circular electro-magnetic S pole shoe. An axial magnetic circuit used for flux adjustment passes through the circular electro-magnetic N pole shoe, the excitation bracket and the circular electro-magnetic S pole shoe, instead of an end cover and the housing. A permanent magnetic circuit and an electro-magnetic circuit are independent of each other, and are neither connected in parallel, nor connected in series, and demagnetizing risks are avoided. The synchronous motor adopts a brushless structure, so as to be high in reliability; moreover, a DC flux adjustment method is adopted, so that the control is convenient, bidirectional excitation can be realized, and the regulating range of an air-gap magnetic field of an electro-magnetic pole is wide.

Description

technical field [0001] The invention relates to a permanent magnet motor, in particular to a magnetic shunt type mixed magnetic pole type synchronous motor, 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, but when the permanent magnet motor is used as a generator, the change of the armature current or the speed of the load caused by the load will cause the terminal v...

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 type 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 Magnetic bridge, simple structure, short axial magnetic circuit, easy to adjust the magnetic field, but the electric excitation and permanent magnet on the rotor are parallel magnetic circuits, and the electric excitation and permanent magnet interact with each other during the magnetic adjustment process

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