Axial magnetic flux brushless hybrid excitation motor

Abstract

The invention relates to an axial magnetic flux brushless hybrid excitation motor. The axial magnetic flux brushless hybrid excitation motor comprises an armature stator core, an armature winding, an inner claw-pole, an outer claw-pole, a permanent magnet, a rotor framework, an excitation stator core and an excitation winding, wherein the armature stator core is a disc-shaped single side grooving structure and is connected with an end cover, a groove of the armature stator core is embedded with the armature winding, for a rotor, the magnetic inner and outer claw-poles and the permanent magnet are embedded in the non-magnetic rotor framework to form a rotary structure together with a rotation shaft, a lower stator comprises two different-radius cores and the annular excitation winding wound between the two cores, and the end cover and an annular core commonly form one part of an electric excitation magnetic circuit. The axial magnetic flux brushless hybrid excitation motor is advantaged in that as a permanent magnetic circuit and the electric excitation magnetic circuit are in mutual parallel connection, a demagnetization risk of the permanent magnet in a magnetic field adjusting process can be avoided, strong magnetic field adjusting capability is realized, and the scope is large; an axial magnetic flux structure is suitable for occasions having special requirements for mounting space; an electric brush portion can be omitted through the special magnetic circuit structure, so the motor structure is made to be reliable, and long service life is realized.

Description

technical field [0001] The invention belongs to the field of hybrid excitation motors, and more specifically relates to a hybrid excitation motor with armature windings and field windings on the stator, permanent magnets on the rotor, magnetic flux along the axial direction, and no need for brushes. Background technique [0002] With the improvement of the performance of the permanent magnet, the permanent magnet motor has been widely used, but it also brings some problems. A motor that only uses permanent magnets to provide excitation, when operating as a motor, its terminal voltage will increase with the speed, and when the terminal voltage exceeds the DC bus voltage, the motor will not work normally, so corresponding field-weakening control is required to make the motor suitable for high-speed operation , the control is complicated, and the loss is large; when it is running as a generator, due to the influence of the internal reactance of the motor, the output voltage cha...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of the prior art, the present invention provides an axial flux brushless hybrid excitation motor to improve the performance of the motor under low-speed, high-torque and high-speed field-weakening conditions, and to solve the problem of reliable brush structure in the prior art motor. Poor performance, permanent magnets are easy to demagnetize under the influence of excitation windings

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