Compact Modular Cycloidal Motor With Embedded Shape Memory Alloy Wires

In this study, we develop a rotary motor using embedded shape memory alloy (SMA) wires, with the aim of realizing a novel compact and modular motor that can generate high-torque bidirectional continuous rotation. Thus, we focus on designing the motion transmission mechanism and torque amplifier of t...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2018-05, Vol.65 (5), p.4028-4038
Main Authors: Hwang, Donghyun, Ihn, Yong Seok, Kim, Keehoon
Format: Article
Language:English
Subjects:
Actuators
Amplification
Amplifiers
Cycloidal motor
DC motors
Flux density
Frequency response
Gears
Product design
rotary actuator
Shafts
shape memory alloy (SMA)
Shape memory alloys
smart actuator
Torque
transmission
Wires
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Summary:In this study, we develop a rotary motor using embedded shape memory alloy (SMA) wires, with the aim of realizing a novel compact and modular motor that can generate high-torque bidirectional continuous rotation. Thus, we focus on designing the motion transmission mechanism and torque amplifier of the motor. The designed motion transmission mechanism that functions to convert the contraction/expansion of the SMA wires to rotational motion enables the motor to generate continuous rotation with relatively short-length SMA wires. Additionally, a double-disc cycloidal speed reducer designed as the torque amplifier allows the motor to reliably generate high torque with a compact structure due to its simple configuration, size variability, and torque amplification functionality. One of the advantages of the motor is that an actuating module could be additionally incorporated into the motor to achieve higher torque. In this case, the overall size and weight of the motor are marginally increased although the output torque capacity almost doubles. Hence, the energy density of the motor significantly increases. The study describes the main concept, operating principle, design, and experimental results of the output torque capacity, positioning characteristics, and frequency response of the proposed motor.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2017.2764839