Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1993-06-10
1994-09-06
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
310 13, H01F 708, H02K 4100
Patent
active
053452062
ABSTRACT:
A cylindrically-symmetrical moving coil linear actuator utilizes axially-magnetized cylindrical magnets to provide flux-focused interleaved magnetic circuits. The moving coil linear actuator includes a cylindrical shell that has a closed end and open end. A magnetic core is disposed within the shell to define an annular air gap between the shell and the core. The core includes a first set of axially-magnetized cylindrical permanent magnets having a first direction of magnetization and disposed in proximity to the closed end of the shell. A second set of axially-magnetized cylindrically permanent magnets has a second direction of magnetization which is opposite of the first direction of magnetization and is disposed in proximity to the open end of the shell. A first ferro-magnetic pole piece is disposed between the first set of magnets and the second set of magnets. A second ferro-magnetic pole piece is disposed between the second set of magnets and the open end of the shell. A moving coil assembly is disposed within the annular air gap. The coil assembly includes a non-magnetic coil carrier disposed within the air gap. A first coil winding is formed on the coil carrier in proximity to the first set of magnets and is wound to have a first polarity. A second coil winding is formed on the coil carrier in proximity to the second set of magnets and is wound to have a second polarity opposite to the first polarity such that the first and second coil windings are wound in series opposition.
REFERENCES:
patent: 3013189 (1961-12-01), Bernier
patent: 3201529 (1965-08-01), Surh
patent: 4318038 (1982-03-01), Munehiro
patent: 4407578 (1983-10-01), Petersen
patent: 4439700 (1984-03-01), Menzel et al.
patent: 4649359 (1987-03-01), Doki et al.
patent: 4692999 (1987-09-01), Frandsen
patent: 4808955 (1989-02-01), Godkin et al.
Barrera Raymond
BEI Electronics, Inc.
Picard Leo P.
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