NDLI: Parametric study on pole geometry and thermal effects of a VRSM

Content Provider	IEEE Xplore Digital Library
Author	Kok-Meng Lee Zhiyong Wei Jeffry Joni
Copyright Year	2004
Description	Author affiliation: George W. Woodruff Sch. of Mech. Eng., Georgia Inst. of Technol., Atlanta, GA, USA (Kok-Meng Lee; Zhiyong Wei; Jeffry Joni)
Abstract	The variable-reluctance spherical motor (VRSM), which offers some attractive features by combining pitch, roll, and yaw motions in a single joint, is essentially a brushless, direct-drive actuator. Unlike a multi-axes actuating mechanism where the number of electrical inputs typically equal to its number of controllable degrees of freedom, the VRSM offers a large number of distributed electrical inputs as compared to the number of controllable DOF. Since larger number of small coils is used, it not only effectively increases the surface area for heat dissipation, but also allows a small amount of current to flow through each of the coils. This distributed actuation offers an effective means to overcome heat dissipation problems commonly associated with direct-drive actuators for high torque applications. To exploit the advantages offered by this unique feature that provides a greater flexibility in design and control, a good understanding of the key parameters that could significantly influence the motor performance is essential. For this reason, we present in this paper some results of a detailed parametric study on the effects of pole geometry on the thermal and torque performance of a three degrees-of-freedom (DOF) VRSM.
Starting Page	548
Ending Page	553
File Size	1052570
Page Count	6
File Format	PDF
ISBN	0780386450
DOI	10.1109/RAMECH.2004.1438979
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-12-01
Publisher Place	Singapore
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Parametric study Geometry Coils Torque Stator cores Actuators Switches Electromagnets Permanent magnets Inverse problems
Content Type	Text
Resource Type	Article

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