A Double Stator Hybrid Excitation Motor with Halbach Permanent Magnet Array

Abstract

The invention discloses a double-stator mixed excitation motor with a Halbach permanent magnet array. An intermediate rotor is coaxially installed between an outer stator and an inner stator, the inner stator is composed of 1 inner stator yoke, 12 inner stator teeth, 12 circular arc-shaped Halbach permanent magnet array modules, 12 inner stator slots and 12 non-magnetic-conduction circular arc-shaped brackets, a bracket is connected between two adjacent inner stator teeth, electric excitation magnetic poles, magnetic channels and mixed magnetic field magnetic poles are respectively arranged onthe inner stator teeth from the inside to the outside, the inner stator tooth portions having a gap between the two brackets form the magnetic channels, concentrated excitation windings are sleeved on the electric excitation magnetic poles, a Halbach permanent magnet array module is fixedly arranged on an outer wall of each bracket, and the Halbach permanent magnet array module is embedded between two mixed magnetic field magnetic poles; and by adoption of the Halbach array structure arrangement, the single-sided magnetic field shielding property and the single-sided magnetization property thereof are fully utilized, the magnetic flux leakage of a permanent magnet at the inner stator is effectively reduced, the utilization rate of the permanent magnet is improved, and the torque output capability is enhanced.

Description

technical field [0001] The invention relates to the fields of electric engineering and motors, in particular to a hybrid excitation motor suitable for application occasions such as electric vehicles and wind power generation that require high torque density and wide speed regulation range. Background technique [0002] Traditional permanent magnet motors have the advantages of high efficiency, high torque, and high power density. Due to the strategic position of rare earth resources and the uncontrollable constant excitation field, the development of traditional permanent magnet motors in related fields has been seriously hindered. Therefore, reducing the amount of rare-earth permanent magnets used in motors and realizing wide speed regulation in the constant power region have become the main goals of research in the field of permanent magnet motors. [0003] A hybrid excitation motor is a motor that has both electric field windings and permanent magnets. Chinese patent pub...

AI Technical Summary

Problems solved by technology

Chinese patent publication No. CN104638792A proposes a parallel hybrid excitation motor. The magnetic field generated by the field winding does not pass through the permanent magnet, and is parallel to the permanent magnet field, which solves the problem of permanent magnets faced by the series hybrid excitation motor. High risk of irreversible demagnetization and large reluctance of excitation field

However, since the motor introduces the excitation current to the rotor excitation winding through brushes and slip rings, it inevitably brings sparks and maintenance problems, thereby reducing the reliability of the motor operation.

Chinese Patent Publication No. CN102820755A proposes a hybrid excitation synchronous motor with a three-dimensional magnetic circuit structure based on an ordinary permanent magnet synchronous motor. The excitation winding of the motor is placed at the end of the motor rotor, and the excitation magnetic field enters through the rotating magnetic bridge. The rotor, and then realize the superposition of the excitation magnetic field and the permanent magnetic field. With the help of the role of the rotating magnetic bridge, the motor cancels the slip ring armature device, and realizes the brushless hybrid excitation synchronous motor. However, the three-dimensional magnetic circuit of the motor The structure increases the difficulty of motor design, analysis and manufacturing

Chinese Patent Publication No. CN106385153A proposes a hybrid excitation motor based on a flux switching motor. The rotor structure is simple, no slip rings and brushes are required, and the operation is reliable and stable. The operation needs to change the direction of the excitation current to realize the two-way adjustment of the total excitation magnetic field, which has a good magnetic adjustment ability; however, since all the magnetic sources of the motor are located on one stator, it will inevitably bring about spatial contradictions and heat dissipation difficulties, etc. question

At the same time, the permanent magnetic field and the electric excitation magnetic field are connected in parallel with each other on the magnetic circuit, which effectively avoids the risk of irreversible demagnetization of the permanent magnet; however, due to the existence of the stator yoke in the motor, the permanent magnet magnetic field has more leakage components in the inner stator. Reduced utilization of permanent magnets

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