Axial magnetic field stator yoke-free magnetic flux reverse permanent magnet motor

Abstract

The invention relates to the field of motor design, and in particular relates to an axial magnetic field stator yoke-free magnetic flux reverse permanent magnet motor. The motor comprises two symmetrically arranged rotors and a stator arranged between the two rotors, and the rotors and the stator are of annular structures and are coaxially connected to form two layers of planar air gaps. Each rotor comprises a rotating shaft and a rotor iron core with circumferential grooves formed in the side wall, the stator comprises first stator iron cores, second stator iron cores and armature windings, the first stator iron cores and the second stator iron cores are alternately arranged at equal intervals in the circumferential direction, stator grooves are formed in the centers of crowns on the two sides of the first stator iron cores, first permanent magnets are embedded in the stator grooves, and second permanent magnets are attached to the surfaces of the two axial sides of the second stator cores. According to the invention, a double-rotor single-stator yoke-free structure is adopted, and a special structure of the large stator iron cores and the small stator iron cores is adopted, so that the magnetic flux leakage of the motor is reduced, the torque characteristic of the motor is improved, and the motor has the characteristics of high torque density, light weight and high permanent magnet utilization rate.

Description

technical field [0001] The invention relates to the field of motor design, in particular to an axial magnetic field stator yokeless flux reversal permanent magnet motor. Background technique [0002] Stator permanent magnet motors place permanent magnets in the stator, and the rotor structure is similar to switched reluctance motors. It has the characteristics of simple structure, strong robustness, and easy manufacturing. Moreover, the heat generated by the permanent magnet can be directly transmitted to the casing through the stator core, which is beneficial to the heat dissipation of the stator. Flux reversal permanent magnet (FRPM) motor is a kind of stator permanent magnet motor, and its structure is similar to the traditional rotor surface-mounted permanent magnet motor, and the permanent magnets are surface-mounted. However, this motor also has many disadvantages, such as large flux leakage of permanent magnets, large torque ripple and so on. Contents of the invent...

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Problems solved by technology

However, this motor also has many disadvantages, such as large flux leakage of permanent magnets, large torque ripple, etc.

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