Voice coil linear actuator, apparatus using the actuator,...

Details Voice coil linear actuator, apparatus using the actuator,... Voice coil linear actuator, apparatus using the actuator,...

2005-02-15

2005-02-15

Lam, Thanh (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Linear

C310S014000

Reexamination Certificate

active

06856049

ABSTRACT:
A voice coil linear actuator comprises: an axially-shaped center yoke formed of a ferromagnetic material; an armature coil concentrically disposed so as to move along the axial direction of the center yoke; and a plurality of ring-shaped permanent magnets which have N and S magnetic poles arranged in the radial direction thereof, and are disposed concentrically as to the armature coil. The armature coil has armature coil units distributed in at least three positions in the axial direction, with adjacent pairs of the armature coil units being arranged so that electric current flows through them in opposite directions, respectively. The permanent magnets are distributed in at least three positions in the axial direction at positions facing respective armature coil units in the radial direction. The respective directions of the N magnetic poles of adjacent permanent magnets are arranged facing in opposite directions.

REFERENCES:
patent: 4612420 (1986-09-01), Nieuwendijk et al.
patent: 5909499 (1999-06-01), Tanabe
patent: 57-185798 (1982-11-01), None
patent: 8-33304 (1996-02-01), None
patent: 11-69755 (1999-03-01), None
patent: 11-299210 (1999-10-01), None
patent: 2000-166211 (2000-06-01), None

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