Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1987-10-05
1989-02-28
Broome, H.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
310 13, H01F 708
Patent
active
048089559
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.
REFERENCES:
patent: 4318038 (1982-03-01), Munehiro
patent: 4669013 (1987-05-01), Scranton
patent: 4692999 (1987-09-01), Frandsen
patent: 4758750 (1988-07-01), Itagaki
Godkin Mikhail
Kimble Jack
BEI Electronics, Inc.
Broome H.
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