Linear actuator with magnets

Details Linear actuator with magnets Linear actuator with magnets

1983-04-06

1985-07-02

Shoop, William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318662, 318671, G05B 1100

Patent

active

045271089

ABSTRACT:
Device for moving a member linearly is composed of at least two permanent magnets, a driving coil, circuit for supplying the driving coil with current, a moving member, and a detector. The two permanent magnets form magnetic field of first direction in first space and field of second direction being reverse to the first direction in second space. Since the driving coil includes a portion disposed in the first space and a portion disposed in the second space, a movement of a given direction is created based on the current flowing through the driving coil. The first and second spaces include a region where the strength of the magnetic field varies gradually. Therefore the relative movement of the driving coil and the permanent magnets can be detected using the detector. The moving member is connected to either the driving coil or the permanent magnet a pen or the like can thus be moved linearly if attached to the member.

REFERENCES:
patent: 4281225 (1981-07-01), Ito et al.
patent: 4456934 (1984-06-01), Wedman et al.
"Y-Axis Pen Handling System", Robert D. Haselby et al., Hewlett-Packard Journal, Nov. 1981, pp. 25-32.

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