Premium
Design, analysis, and realization of a magnetic force transmission PM brushless motor
Author(s) -
Libing Jing,
Ting Zhang,
Ying Lin,
Jia Cheng
Publication year - 2018
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.22631
Subject(s) - cogging torque , torque ripple , harmonics , rotor (electric) , torque , counter electromotive force , waveform , magnet , control theory (sociology) , magnetic gear , ac motor , physics , electromagnetic coil , sine wave , torque density , direct torque control , computer science , engineering , electrical engineering , induction motor , voltage , control (management) , artificial intelligence , thermodynamics
This paper proposes a novel direct‐driving motor that successfully embeds a permanent magnet brushless motor (PMBM) into a concentric magnetic gear (CMG). The PMBM and CMG share a common high‐speed rotor. In order to reduce the flux harmonics and get high torque density, Halbach arrays are employed to arrange the PM's poles on each side of the rotor, which completely makes the internal PMBM field and the external CMG field decoupled and improves the magnetic field characteristic. The results of finite element computation show that the proposed motor with Halbach arrays has over 7.5% higher torque density and that the cogging torque reduces to 1/20 that of a conventional radial magnetization motor; moreover, in the test, the back‐EMF waveform is closer to a sine wave and the three‐phase current waveforms show good agreement between the simulated and experimented results under the same load. The torque ripple is small and the dynamic performance is good. At the same time, the efficiency at the rated point is very close to the experimental one, which validates the effectiveness of the design method for the PMBM in the CMG. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.