Electricity: motive power systems – Positional servo systems – Plural servomotors
Patent
1994-06-21
1997-09-09
Wysocki, Jonathan
Electricity: motive power systems
Positional servo systems
Plural servomotors
318649, B64C 1706
Patent
active
056660383
ABSTRACT:
A positioning table device includes a table, a guide for guiding movement of the table in a predetermined direction, a drive device for moving the table along the predetermined direction, the driving device including a permanent magnet provided on the table and a plurality of coils provided along the predetermined direction, a position detecting device for detecting a position of the table in the predetermined direction, a designating device for designating an energization electric current in accordance with an output of the position detecting device, a coil selector for selecting a coil, of the coils to be energized, in accordance with the position of the table in the predetermined direction, a correcting device for correcting the energization electric current designated by the designating device when the coils to be energized are changed by the coil selecting device, such that a change in coil energization electric current is slowed whereby combined energization electric currents applied to the coils are maintained substantially at a constant magnitude, and a current supply device for energizing the selected coil in accordance with the corrected energization electric current.
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Patent Abstracts of Japan, Kokai No. 62-123983, vol. 11, No. 343, Nov. 1987 .
Canon Kabushiki Kaisha
Wysocki Jonathan
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