A Cycloid Wobble Motor Using Shape Memory Alloy Wires

Title
A Cycloid Wobble Motor Using Shape Memory Alloy Wires
Authors
황동현Higuchi, Toshiro
Keywords
shape memory alloy; rotary actuator; wobble motor; stepper motor; cycloidal driving mechanism
Issue Date
2014-04
Publisher
Smart materials & structures
Citation
VOL 23, 1-13
Abstract
A cycloidal wobble motor driven by shape memory alloy (SMA) wires is proposed. In realizing a motor driving mechanism well known as a type of reduction system, a cycloidal gear mechanism is utilized. It facilitates the achievement of bidirectional continuous rotation with hightorque capability, based on its high efficiency and high reduction ratio. The applied driving mechanism consists of a pin/roller based annular gear as a wobbler, a cycloidal disc as a rotor, and crankshafts to guide the eccentric wobbling motion. The wobbling motion of the annular gear is generated by sequential activation of radially phasesymmetrically placed SMA wires. Consequently the cycloidal disc is rotated by rolling contact based cycloidal gearing between the wobbler and the rotor. In designing the proposed motor, thermomechanical characterization of an SMA wire biased by extension springs is experimentally performed. Then, a simplified geometric model for the motor is devised to conduct theoretical assessment of design parametric effects on structural features and working performance. With consideration of the results from parametric analysis, a functional prototype threephase motor is fabricated to carry out experimental verification of working performance. The observed experimental results including output torque, rotational speed, bidirectional positioning characteristic, etc obviously demonstrate the practical applicability and potentiality of the wobble motor.
URI
http://pubs.kist.re.kr/handle/201004/51041
ISSN
09641726
Appears in Collections:
KIST Publication > Article
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