Rotor circuit double-ended excitation type hybrid excitation electrical machine

Abstract

The invention discloses a rotor circuit double-ended excitation type hybrid excitation electrical machine comprising a housing. A stator composed of an armature core and an armature winding and a rotor composed of an N-pole magnet yoke, an N-pole shoe, an S-pole magnet yoke, an S-pole shoe, a permanent magnet magnetized in a tangential manner and a spindle are installed in the housing. Two ends in the axial direction are provided with an electric excitation device respectively. The main pole air-gap magnetic field of the electrical machine is generated by the permanent magnet and electric excitation devices collectively, brushless electric excitation can be realized through the excitation devices, so smooth adjustment can be performed on the main pole air-gap magnetic field in a certain range, when the electrical machine is used in an electromotor, the magnetic field is adjusted to make the electrical machine comprise a wide constant power region to realize weak magnetism speed raising, when the electrical machine is used as a generator, the voltage adjustment requirement can be satisfied through the design of structure parameters, compared with the prior art, advantages of short axial magnetic circuit, the magnetism-collected structure type permanent magnet, large air-gap magnetic field and high efficiency can be realized; additionally, the axial structure is symmetrical, the rotor weight is distributed evenly in the axial direction, stresses on left and right bearings are consistent; a magnetic bridge is located at the axial end, and the assembly is convenient.

Description

technical field [0001] The invention relates to a permanent magnet motor, in particular to a rotor circuit double-end excitation hybrid excitation 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. 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 will cause the termin...

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. Magnetic bridge, simple structure, short axial magnetic circuit, easy to adjust the magnetic field, but it belongs to single-ended excitation, the rotor magnetic field is unevenly distributed in the axial direction, which is easy to cause local saturation. In addition, in order to ensure the placement space of the excitation winding, it needs to be extended In the axial part of one end, the structure of the rotor is asymmetrical, resulting in uneven distribution of the weight of the rotor in the axial direction

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