Axial additional airgap rotor magnetic-shunt type hybrid excitation synchronous motor

Abstract

The invention relates to an axial additional airgap rotor magnetic-shunt type hybrid excitation synchronous motor, which belongs to the field of synchronous motors. The axial additional airgap rotor magnetic-shunt type hybrid excitation synchronous motor provided by the invention comprises a synchronous motor consisting of a stator and a rotor, the stator is arranged in a casing and composed of an armature core and an armature winding, and the rotor is provided with a rotating shaft, composed of a N pole shoe, a S pole shoe and a tangential magnetized permanent magnet, and arranged in the stator; and the axial additional airgap rotor magnetic-shunt type hybrid excitation synchronous motor is characterized in that the N pole shoe and the S pole shoe of the rotor axially extend towards a same direction, an axial additional airgap with a certain length is respectively formed between a hollow cylindrical pole shoe and a circular pole shoe which are formed by drawing and the inner wall and outer wall of a ring-shaped magnetic-conducting bridge fixed on a rear end cover of the motor. Compared with the prior art, the hybrid excitation synchronous motor has the advantages of large excited magnetic potential, markedly shortened axial magnetic circuit, uneasy saturation, large airgap flux density, high motor power density, and the like; and the motor is suitable to be applied to high-performance drive and power generation occasions on which the length of the motor is limited.

Description

Technical field [0001] The invention relates to a magnetic shunt hybrid excitation synchronous motor with an axial additional air gap rotor, belonging to the field of hybrid excitation synchronous motors. Background technique [0002] Compared with the permanent magnet motor, the biggest advantage of the hybrid excitation synchronous motor is that the air gap magnetic field can be adjusted, and the effective air gap magnetic field adjustment range is an important factor to measure the performance of the hybrid excitation motor. [0003] There are generally two magnetic flux paths in a hybrid excitation synchronous motor, the main magnetic circuit and the axial magnetic circuit. The main air gap magnetic flux is adjusted mainly by adjusting the magnetic flux in the axial magnetic circuit, so the size of the axial magnetic flux is adjusted The axial magnetic circuit design is very important in the design of the hybrid excitation motor. [0004] Most of the axial magnetic circuit of th...

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Problems solved by technology

However, in order to ensure the cross-sectional area of ​​the axial magnet guide in the direction of the magnetic circuit and the space for the field winding to be embedded in the magnetic guide bridge, the extension end of the N pole or S pole magnet guide needs to expand outward, so that the extension must avoid the short-circuit part of the stator winding. The length of the motor makes the axial length of the motor longer, and the window cross-sectional area of ​​the magnetic bridge is limited, which makes the excitation magnetic potential smaller and affects the magnetic field adjustment range of the motor. It is difficult to use in some applications where the length of the motor is limited.

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