Moving coil linear actuator with interleaved magnetic circuits
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United States of America Patent
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Feb 28, 1989
Grant Date -
N/A
app pub date -
Oct 5, 1987
filing date -
Oct 5, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
According to a preferred embodiment of the present invention, a double-ended moving coil linear actuator is provided comprising a cylindrical core and a hollow shell disposed around the core to define an annular space between the inner wall of the shell and the outer wall of the core. A non-magnetic spacer is mounted in the annular space to divide the annular space into first and second annular cavities, each of the cavities having a closed end adjacent the spacer and an open end. A first set of magnets is mounted within the first annular cavity to define a first magnetic circuit. A second set of magnets is mounted within the second annular cavity to define a second magnetic circuit. The magnets of these two magnetic circuits are sized and arranged to define a third 'interleaved' magnetic circuit which is created by the interaction of the first two circuits. Each of the first two magnetic circuits has a dual-winding coil assembly associated with it. The windings of the assembly are arranged to correspond to the arrangement of the magnets within the associated magnetic circuit.
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