Positioning table and linear motor

Electricity: motive power systems – Linear-movement motors

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310 12, 310 13, H02K 4100

Patent

active

045609110

ABSTRACT:
A linear DC motor adapted for driving a positioning table having a frame and a table displaceable in a linear direction has a toothed assembly affixed to one element thereof and an array of permanent magnets facing the toothed assembly mounted on the other element. Coils wound around the teeth of the toothed assembly and appropriately energized by DC produce a linear force which is effective to displace the table in a desired direction. When used with a position sensor and an appropriate control system, the table is controllable to a desired position. A set of brush members depending from the table contact a developed linear slip ring track for energizing the coils and for switching polarity of voltage to the coils at appropriate locations. In an embodiment where the coils are stationary on the frame and the magnets are disposed on the table, a power pickup arrangement movable with the brush members is incorporated into the brush and developed slip ring apparatus.

REFERENCES:
patent: 4369383 (1983-01-01), Langley
"D.C. Linear Motors for Elevator Door Operators", by P. L. Jones, published in Elevator World, May 1970.
"D.C. Linear Motors for Industrial Applications", by P. L. Jones, published in Electrical Times, Jul. 10, 1969.
"An Introduction to the Linear D.C. Motor", by J. J. Brough, published in Electronics & Power, Sep. 5, 1974.
"The Linear D.C. Motor Improves Control Flexibility", by J. J. Brough, published in Electrical Review, Nov. 8, 1974.
"Position Control of Linear D.C. Motors", by J. J. Brough, published in Electrical Review, vol. 199, No. 11, Sep. 17, 1976.

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