1975-01-09
1976-05-18
Miller, J. D.
317151, H01H 4732
Patent
active
039581608
ABSTRACT:
The invention relates to a device for generating time-dependent currents in a coil, for example, a magnetic coil. A magnetic coil of this kind can be used, in combination with a second similar coil, for generating rotary magnetic fields in a device for transporting magnetic bubbles along a guide structure, consisting of discrete elements, on a plate of magnetic material. The device comprises two or more current connection terminals, an LC series oscillator circuit and a switching element which is connected in series with the coil. If the switching element is opened for a period of time amounting to one half to one whole oscillator period, the oscillator performs a whole period. A short-circuit element, connected parallel to the capacitor, can fully discharge the capacitor. When two switching elements are connected between a connection of the coil and a positive and a negative current connection terminal, respectively, whilst the other connection of the coil is connected to an earth terminal, oscillations at a phase difference of 180.degree. can occur. In that case two short-circuit elements are required. A second magnetic field coil can be energized by a device which continues to energize the coil in the rest state, so that the direction of rotation of the rotary magnetic field can be reversed.
REFERENCES:
patent: 3025411 (1962-03-01), Rumble
patent: 3072045 (1963-01-01), Goin
de Niet Edmond
VAN DEN Enden Adrianus Wilhelmus Maria
McGlynn Daniel R.
Miller J. D.
Moose Harry
Trifari Frank R.
U.S. Philips Corporation
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