Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1991-12-30
1992-10-13
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361147, 73505, 219 75, 335306, H02N 1500
Patent
active
051556510
ABSTRACT:
A levitator which is mounted on a space station; for example, for use in material science experiments in space. The levitator has a position detector for detecting the position of a sample, a variable power supply whose output voltage varies in accordance with the signal output from the position detector, a pair of planar electrodes connected to two ends, respectively, of the variable power supply and disposed in opposing relation to each other, and a ring electrode disposed so as to surround each of the planar electrodes and to which is applied a higher voltage than that applied to the corresponding planar electrode from a DC power supply, thereby holding the sample stationary at a desired position by means of the planar and ring electrodes. The levitator further has a means for rotating the sample being held stationary. Thus, it is possible to rotate the sample in a controlled manner and hence possible to carry out an experiment in which the sample is uniformly heated in a microgravity environment.
REFERENCES:
patent: 3815000 (1974-06-01), Phillips et al.
patent: 4393706 (1983-06-01), Barmatz
patent: 4420977 (1983-12-01), Elleman et al.
patent: 4874346 (1989-10-01), Wachspress
"Development of an electrostatic positioner for space material processing", W. K. Rhim, M. Collender, M. T. Hyson, W. T. Simms, and D. D. Elleman, Rev. Sci. Instrum. 56(2), Feb. 1985, pp. 307-317.
Ikegami Kazunori
Itoga Kenji
Okuda Souichiro
Yoda Shinichi
Gaffin Jeffrey A.
Mitsubishi Denki & Kabushiki Kaisha
National Space Development Agency of Japan
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