Modular axial flux permanent magnet motor

Abstract

The invention discloses a modular axial flux permanent magnet motor. The motor comprises a stator, double rotors and a bearing. The stator comprises a stator iron core, a stator winding, stator iron core fixing pins and a stator sealing plate. The stator iron core adopts a modular structure, the stator winding is wound on a yoke part of the stator iron core, and the stator iron core fixing pins radially penetrate through the stator iron core and are fixed on a fixed ring. The stator sealing plate is used for sealing stator cooling oil to improve the cooling effect. The rotors comprise rotor back yokes and rotor permanent magnets which are symmetrically installed on two sides of the stator, the rotor permanent magnets are fixed to the rotor back yokes, and inner circumferences of the rotorback yokes are fixed to the bearing. Equal air gaps are kept between the double rotors and the stator to generate a magnetic field. The modular axial flux permanent magnet motor has the advantages ofhigh air gap flux density, high stator structural strength, high torque density and good cooling effect and is suitable for being applied to electric propulsion, wind power generation and high-speed flywheel energy storage occasions.

Description

technical field [0001] The invention relates to the technical field of axial flux permanent magnet motors, in particular to a modular axial flux permanent magnet motor. Background technique [0002] Axial flux permanent magnet motors are also called disk motors. Compared with traditional radial motors, they have the characteristics of high torque density, short axial length, and high efficiency. They are used in electric vehicles, wind power generation, and aviation propulsion systems. It has a good application prospect. However, both the stator and rotor of the axial motor are subjected to a large axial electromagnetic force, and the stator is difficult to manufacture, inconvenient to assemble, poor in mechanical strength, and prone to deformation. [0003] In order to solve the problem of manufacturing and assembling the stator of the axial magnetic field permanent magnet motor, the patent CN102315741A discloses an axial permanent magnet motor using a modular amorphous al...

AI Technical Summary

Problems solved by technology

However, the stator and rotor of the axial motor are subjected to a large axial electromagnetic force, and the stator is difficult to manufacture, inconvenient to assemble, poor in mechanical strength, and prone to deformation

[0003] In order to solve the problem of manufacturing and assembling the stator of the axial magnetic field permanent magnet motor, the patent CN102315741A discloses an axial permanent magnet motor using a modular amorphous alloy stator. The parts are fixed together with the casing, although the difficulty of installing the stator has been solved, the problem that the stator is subjected to axial electromagnetic force has not been solved, and it is not suitable for high-power applications.

U.S. patent US6838800B2 proposes a stator modular construction technology for radial motors, which greatly reduces the offline process of stator windings and improves assembly efficiency; CN1417921A uses the stator modular technology of American radial motors to propose an axial magnetic motor. Stator modularization technology of permanent magnet motor, but the phenomenon of unilateral magnetic pull in this motor greatly limits its application in high-power occasions

[0004] Under the premise of a certain motor structure size, the way to increase the power density of the motor is to increase the electromagnetic load and speed of the motor. When the speed is high, the higher frequency and magnetic load will cause greater iron loss in the stator core of the non-oriented silicon steel sheet. , so that the efficiency of the motor in the high-speed area is greatly reduced. In order to reduce the iron loss of the axial magnetic field permanent magnet motor at high speed, CN201510794930.3 discloses a soft magnetic powder core axial flux motor with high saturation magnetic induction intensity. The stator silicon steel sheet Replacement with soft magnetic powder core with high saturation magnetic induction intensity greatly reduces the loss at high speed, but the structural strength of the material is poor, which greatly reduces the mechanical strength of the stator and affects its operational reliability

[0005] In summary, although the axial flux permanent magnet motor has the advantages of high torque, high power density, and short axial length, it still has unstable stator structure, difficult manufacturing process, and rich harmonic content of the air gap magnetic field. It leads to problems such as large loss of stator core at high speed and poor heat dissipation of stator winding

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