Computer Science
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.480..249i&link_type=abstract
In: Proceedings of the 9th European Space Mechanisms and Tribology Symposium, 19-21 September 2001, Liège, Belgium. Compiled by
Computer Science
1
Actuators
Scientific paper
A new type of actuator that uses shape memory alloy (SMA) has been developed for the solar paddle of small satellites. This actuator can rotate 360 degrees continuously, can orient the solar paddle to face the sun by itself, and is equipped with a counterweight in order to compensate for the rotating motion of the small satellite in microgravity. The size of the actuator is 100 mm in diameter and 127 mm in height, and the mass is approximately 660 g including the counterweight. We use six SMA springs to rotate the paddle. Each spring has a cylindrical mirror behind it in order to concentrate the sun's energy onto the spring. Movement experiments in the microgravity field and in a vacuum were conducted, respectively. The microgravity experiment uses an air table and the actuator is set up vertically to avoid the effect of gravity. A vacuum chamber with a turntable and two windows is used. An infrared heater is used to heat the SMA from one direction to simulate the sun.
Fujiwara Yoshiki
Iwata Toshiaki
Murakami Hiroshi
Ogawa Akira
Toda Yoshitsugu
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