DocumentCode :
436274
Title :
Parametric study on pole geometry and thermal effects of a VRSM
Author :
Lee, Kok-Meng ; Wei, Zhiyong ; Joni, Jeffry
Author_Institution :
George W. Woodruff Sch. of Mech. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Volume :
1
fYear :
2004
fDate :
1-3 Dec. 2004
Firstpage :
548
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.
Keywords :
brushless machines; cooling; distributed parameter systems; electric actuators; reluctance motor drives; rotors; torque; brushless direct-drive actuator; distributed actuation; heat dissipation; high torque applications; pitch motion; pole geometry; roll motion; thermal effects; thermal performance; three degrees-of-freedom VRSM; torque performance; variable-reluctance spherical motor; yaw motions; Actuators; Coils; Electromagnets; Geometry; Inverse problems; Parametric study; Permanent magnets; Stator cores; Switches; Torque;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Robotics, Automation and Mechatronics, 2004 IEEE Conference on
Print_ISBN :
0-7803-8645-0
Type :
conf
DOI :
10.1109/RAMECH.2004.1438979
Filename :
1438979
Link To Document :
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