Sine wave rotor based on permanent magnet and inner rotor core eccentric structure design

Abstract

The invention relates to the technical field of generators, and particularly discloses a sine wave rotor based on a permanent magnet and inner rotor iron core eccentric structure design, which comprises an outer rotor iron core, a plurality of eccentric permanent magnets, an inner rotor iron core and a rotor shaft. The plurality of eccentric permanent magnets are alternately arranged along the radial inner side of the outer rotor iron core, every two adjacent eccentric permanent magnets are opposite in magnetizing direction, each eccentric permanent magnet is composed of an arc edge outer contour, an eccentric arc inner contour and two side edges, the inner contour of the inner rotor iron core is circular, the outer contour is composed of a set of eccentric arcs protruding outwards, and an annular air gap is formed between the radial outer side of the inner rotor iron core and the eccentric permanent magnets. The sine wave rotor designed based on the permanent magnet and the inner rotor core eccentric structure is adopted, the air-gap flux density waveform of the energy storage flywheel generator is improved, the harmonic content in an air-gap magnetic field is reduced, the air-gap magnetic field is made to be close to sine waves, the counter electromotive force waveform of the generator is improved, torque pulsation is reduced, and the performance of the energy storage flywheel generator is improved.

Description

technical field [0001] The invention relates to the technical field of generators, and specifically discloses a sine wave rotor based on permanent magnets and an eccentric structure design of an inner rotor iron core. Background technique [0002] The traditional hollow cup type permanent magnet energy storage flywheel generator is used in many applications and high-speed occasions, and requires high speed regulation accuracy. Therefore, most of them have sine wave phase current drive control, and the sine wave phase current needs to interact with the sine wave opposite electromotive force , to reduce electromagnetic torque ripple. However, in the traditional hollow cup type permanent magnet energy storage flywheel generator, the 3rd, 5th, and 7th harmonic content in the back electromotive force waveform is relatively large, which causes the energy storage flywheel generator to generate electromagnetic torque pulsation and affects the performance of the energy storage flywhe...

AI Technical Summary

Problems solved by technology

[0003] The existing authorized national invention patent discloses a stator-less iron-core hollow cup energy storage flywheel generator structure, in which the hollow cup stator structure can be used in the design of permanent magnet synchronous motors, so that both the inner and outer rotor cores rotate synchronously with the eccentric permanent magnets , so that there will be no loss in the iron core, and at the same time, the coreless stator makes the stator a cogging-free structure, which can eliminate cogging torque and tooth harmonics; The distance between the midpoint of the outer contour of the arc edge and the midpoint of the eccentric arc inner contour is uniform, resulting in consistent radial air gap reluctance, affecting the distribution of the air gap magnetic field, making the air gap magnetic field larger in harmonic content and less sinusoidal , affecting the performance of the energy storage flywheel generator

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