NDLI: Method of Current Compensation for Reducing Error of Holding Torque of Permanent-Magnet Spherical Wheel Motor

Content Provider	IEEE Xplore Digital Library
Author	Dong-Woo Kang Won-Ho Kim Sung-Chul Go Chang-Sung Jin Sung-Hong Won Dae-Hyun Koo Ju Lee
Copyright Year	1965
Abstract	A permanent magnet spherical wheel motor, which consists of magnets on rotor and coils on spherical stator, is able to operate on 3-D space as using magnetic alignment torque generated from between coils and magnets. Especially the shaft can be tilted stably by optimized coil position on stator. Because, however, the spherical wheel motor has feature of 3-D structure as relative position between coils and magnets, stable holding torque for rotor position should be analyzed as function of the tilt degree of a shaft. The characteristic of stable holding torque can be changed nonlinearly by the alpha and beta degrees of a shaft. Therefore, when reference current is commanded at coils, the shaft cannot be tilted to the reference position exactly for the nonlinear characteristic. In this paper, for improving the nonlinear phenomenon of holding torque, the authors research and improve a current compensation function to increase stable operating range. Also, the compensation function was estimated by using torque ripple computed from torque simulation.
Sponsorship	IEEE Magnetics Society
Starting Page	2819
Ending Page	2822
Page Count	4
File Size	1323475
File Format	PDF
ISSN	00189464
Volume Number	45
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Torque Wheels Coils Permanent magnet motors Rotors Stators Shafts Magnetic analysis Educational institutions Industry applications spherical wheel motor Current compensation curve fitting method permanent magnets electric machines
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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