Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1997-03-18
1998-10-13
Gellner, Michael L.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
335230, 335234, 335255, 335260, 335282, 296021, 29606, 29607, 29608, 26427219, 2642722, H01F 700, H01F 708, H01F 706, B29C 4322
Patent
active
058218416
ABSTRACT:
A microceramic linear actuator includes a unitary ceramic body which has been formed with an internal cavity; a piston mounted for linear movement within the internal cavity and having a micromagnet with first and second poles of opposite polarity, and at least one shaft attached to the micromagnet; a conductive coil embedded in the unitary ceramic body and having a first portion wound in a clockwise direction and disposed in operative relationship to the first pole of the micromagnet, and a second portion wound in a counterclockwise direction and disposed in operative relationship to the second pole of the micromagnet. A power supply applies current in first and second directions to the coil such that when the current is applied in the first direction it flows through both coil portions, and the clockwise portion of the coil imparts a force to the first pole of the micromagnet, and the counterclockwise portion of the coil imparts a force to the second pole of the micromagnet thereby causing such micromagnet and its attached shaft to move in the first linear direction, and when it is applied in a second direction the clockwise portion of the coil imparts an opposite force to the first pole of the micromagnet, and the counterclockwise portion of the coil imparts an opposite force to the second pole of the micromagnet thereby causing such micromagnet and its attached shaft to move in a second linear direction.
REFERENCES:
patent: 4494098 (1985-01-01), Haneda et al.
patent: 5434549 (1995-07-01), Hirabayashi et al.
Chatterjee Dilip K.
Furlani Edward P.
Ghosh Syamal K.
Barrera Raymond
Eastman Kodak Company
Gellner Michael L.
Owens Raymond L.
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