|Keywords||Shape Memory Alloy, Actuator, Artificial Muscle, Robot, Bio-Motion, Rolled Film Tube, Unit Cell, Motor Unit, Pulse Frequency Modulation|
|Abstract||In the present study we attempted to develop an actuator that is comparable to a natural muscle in terms of flexibility, output force and responsiveness. In an earlier report we presented the Shape Memory Alloy (SMA) actuator protected by “a rolled film tube” that exhibited high heat resistance and high flexibility, and termed it “the unit cell”. In the present study, we developed an actuator dubbed “a motor unit” exhibiting a larger output force by bundling 7 unit cells together, and investigated the characteristics of this motor unit in experiments where the motor unit was driven by Pulse Frequency Modulation (PFM). The results of the experiments indicate that the static characteristics of the output force and the displacement due to the input pulse frequency in the motor unit are proportionate in comparison to the unit cell, and that the output force is nearly 7 times greater than that of the unit cell. Results also indicate that the time constant of the motor unit increases compared to that of the unit cell, and power conversion efficiency decreases when pulse width is extended to improve the time constant|
|Full text||Full Text in PDF (994 KB)
|Included Refrences||8 References (List...)|
|Cited by other Articles||0 Citations (List...)|
Article is cited by:
References included in article:
|Order of appearence||Full citation||SRCosmos Link|
|1||Ishikawa T, Nakada T, |
(2005), Shape Memory Alloy Actuator for Artificial Muscle (Proposition of Rolled Film Tube Method), Transactions of the Japan Society of Mechanical Engineers, Series C, Vol.71, No.703 pp. 944-950.
|2||Ishikawa T, Nakada T, |
(2005-9), Study on Artificial Muscle Actuator using Shape Memory Alloy (2nd Report, Characteristics of Motor Unit), Proceedings of the 41st JSME Tohoku Branch Autumn Conference, pp.71-72.
|3||Ishikawa T, Nakada T, |
(2006-11), Study on Artificial Muscle Actuator using Shape Memory Alloy (3rd Report, Improvement of Motor Unit's response time), Proceedings of Fluid Power System Conference 2006 Autumn, pp.58-60.
|4||Wirhed R, |
(1996), Athletic Ability & the Anatomy of Motion, p.13, Taishukan Publishing Company.
|5||Yamamoto K, Maruyama K, |
(1986), Muscle (in Japanese), p.14, Kagaku-Dojin Publishing Company. INC.
|6||Miyamura S, Yabe K, |
Physical workouts (in Japanese), (1986), p.19, Shinko Trading Co Ltd Publication Department.
|7||Hunter I, Lafontaine S, Hollerbach J, Hunter P, |
(1991), Fast Reversible NiTi Fibers for Use in MicroRobotics, Proceedings of the 1991 IEEE Micro Electro Mechanical Systems - MEMS'91.Nara.Japan, pp.166-170.
|8||Ashley S, |
(2003), Artificial Muscles, SCIENTIFIC AMERICAN, OCTOBER pp.34-41.