Design and Analysis of Halbach Ironless Flywheel BLDC Motor/Generators

Halbach array-based permanent magnet (PM) brushless machines exhibit attractive features when compared with conventional PM brushless machines with normal segmented magnets, including the flux-concentration effect, essentially sinusoidal air-gap flux density due to PMs, and negligible cogging torque...

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Bibliographic Details
Published inIEEE transactions on magnetics Vol. 54; no. 11; pp. 1 - 5
Main Authors Liu, Kai, Yin, Ming, Hua, Wei, Ma, Ziqi, Lin, Mingyao, Kong, Yong
Format Journal Article
LanguageEnglish
Published New York IEEE 01.11.2018
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Air gaps
Air-gap field distribution
Arrays
Brushless DC motors
Brushless motors
Cogging
Current loss
D C motors
eddy current loss
Eddy current testing
Eddy currents
Flux density
Flywheels
Halbach magnet motor
ironless brushless dc motor (BLDCM)
Magnetism
Permanent magnet motors
Permanent magnets
Product design
Torque
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Summary:Halbach array-based permanent magnet (PM) brushless machines exhibit attractive features when compared with conventional PM brushless machines with normal segmented magnets, including the flux-concentration effect, essentially sinusoidal air-gap flux density due to PMs, and negligible cogging torque. However, as for a motor/generator used in flywheel, an external rotor composed of Halbach array and rotor back-iron is necessary to increase the inertia of flywheel system, which is different from the conventional external-rotor machines. In this paper, a Halbach array PM motor is studied compared with the radial magnet array. The relationship between the air-gap field distribution and the magnet array is discussed. Finally, the eddy current loss in PMs of the external-rotor ironless brushless dc motor is analyzed between the Halbach PM motor and the conventional PM motor.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2018.2833958