Hybrid excitation magnetic gears for improving transmission stability

JING Libing1,2, CHEN Junlin1, ZHANG Ting1

Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (17) : 178-183.

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (17) : 178-183.

Hybrid excitation magnetic gears for improving transmission stability

  • JING Libing1,2, CHEN Junlin1,  ZHANG Ting1
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Abstract

Coaxial magnetic gear is a novel transmission device with wide application prospects in low speed and large torque transmission field.Here, in order to solve the problem of traditional surface mounted magnetic gear having high harmonic content and large torque ripple in air-gap magnetic density,a coaxial magnetic gear with eccentric surface mounted inner magnetic pole  and external magnetic pole magnetized by two modes of permanent magnet and electric excitation was proposed.The finite element method was used to calculate air-gap magnetic field and electromagnetic torque of traditional type, slotted without current type and slotted current type magnetic gears, and harmonic contents of inner layer air-gap magnetic density and outer onewereanalyzed.The simulation results showed that the eccentricmagnetic pole structure is beneficial to improve inner layer magnetic density waveform and reduce its harmonic distortion rate; increasing current excitation can not only guarantee output torque but also reduce torque ripple,this is of great significance for improving the transmission stability of coaxial magnetic gears.

Key words

coaxial magnetic gear / eccentric magnetic pole / torque ripple / air-gap magnetic field / aberration rate

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JING Libing1,2, CHEN Junlin1, ZHANG Ting1. Hybrid excitation magnetic gears for improving transmission stability[J]. Journal of Vibration and Shock, 2019, 38(17): 178-183

References

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