Electricity: motive power systems – Positional servo systems – With stabilizing features
Patent
1980-07-07
1982-05-11
Truhe, J. V.
Electricity: motive power systems
Positional servo systems
With stabilizing features
318616, 318685, G05B 501
Patent
active
043296335
ABSTRACT:
Apparatus is disclosed for controlling the movement of a movable element to bring the movable element to rest at a desired stopping position. The apparatus comprises a multiphase drive motor having a drive shaft coupled to the movable element for driving same, a plurality of electrically conductive coils mounted in position displaced relationship about the drive shaft, and means coupled to the drive shaft and responsive to the selective energization of the coils by respective motor drive signals for causing the corresponding rotation of the drive shaft and movement of the movable element; a sensor coupled to the drive shaft and responsive to the rotation thereof for generating an electrical signal containing information indicative of the direction, speed and distance of movement of the movable element; means for detecting from the distance information indicated by the electrical signal whether the movable element is within a predetermined distance of the desired stopping position; and control means for controlling the levels of the motor drive signals in dependence upon the direction information indicated by the electrical signal following detection of the movable element being within the predetermined distance of the desired stopping position, the motor and thus the movable element being brought to a final stop with only a single one of the motor drive signals on.
REFERENCES:
patent: 3463985 (1969-08-01), Fredriksen
patent: 3476996 (1969-11-01), Fredriksen
patent: 3482155 (1969-12-01), Fredriksen
patent: 3839665 (1974-10-01), Gabor
Abend Serge
Indyk Eugene S.
Smith Barry Paul
Truhe J. V.
Xerox Corporation
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