Square wave rotor based on outer rotor iron core eccentric structure design

Abstract

The invention relates to the technical field of generators or motors, and particularly discloses a square wave rotor designed based on a outer rotor iron core eccentric structure design. The square wave rotor comprises an outer rotor iron core, permanent magnets, a stator, an inner rotor iron core and a rotor shaft, the radial outer side of the outer rotor iron core is installed at the outer end of the rotor shaft, the radial inner side of the inner rotor iron core is installed at the inner end of the rotor shaft, the permanent magnets are tile-shaped, and the permanent magnets are alternately arranged along the radial outer side of the inner rotor iron core. The magnetizing directions of every two adjacent permanent magnets are opposite, the outer contour of the outer rotor iron core is round, the inner contour of the outer rotor iron core is composed of a plurality of eccentric arcs in the circumferential direction, the number of the eccentric arcs is the same as that of the permanent magnets, and annular air gaps are formed between the radial inner side of the outer rotor iron core and the permanent magnets. After the outer rotor core eccentric structure design is adopted, the air-gap flux density waveform of the motor is effectively improved, and an air-gap magnetic field is close to a square wave, so that the back electromotive force waveform of the motor or a generator is improved, the torque pulsation is reduced, and the motor performance is improved.

Description

technical field [0001] The invention relates to the technical field of generators or motors, and specifically discloses a square-wave rotor based on an eccentric structure design of an outer rotor iron core. Background technique [0002] Traditional square-wave motors are mostly used in low-speed and high-load applications. They are driven and controlled by square-wave phase currents. Square-wave phase currents need to interact with square-wave opposite electromotive forces to reduce electromagnetic torque ripple; For wave motors, the back electromotive force waveform is quite different from the square wave, which causes the motor to generate electromagnetic torque ripples, which affects the performance and efficiency of the motor. In the same way, traditional energy storage flywheel brushless DC generators are mostly used in low-speed and high-load situations, and are mostly driven and controlled by square wave phase current. The square wave phase current needs to interact ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem of the present invention is to overcome the problem of the performance of the motor or generator caused by the large difference between the back electromotive force waveform and the square wave in the prior art, and to provide a square wave rotor based on the eccentric structure design of the outer rotor core to solve There is a large difference between the air gap magnetic field waveform and the square wave and the problem of magnetic flux leakage between poles

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