Electromagnetic actuator magnetically locked into two or more stable positions
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United States of America Patent
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-
Feb 1, 2000
Grant Date -
N/A
app pub date -
May 15, 1998
filing date -
May 31, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electromagnetic actuator has four positions which are stable in the absence of a current and moves rapidly between these positions when acted upon by a current. The actuator has a thin, rotatable magnet (3) with two pairs of magnetic poles transversally magnetised in alternate directions, and a stator member having four pole pieces (9-12, 34-37, 48-51) of developed length P, each with an excitation coil. Two consecutive poles of the thin magnet (3) are spaced by a distance d. The thin magnet (3) is movable in an airgap of width E. wherein the size ratio P:E and P:d is greater than 8. The invention is useful for driving a device such as a valve or a switch.
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