Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1996-05-03
1997-09-23
Cabeca, John W.
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
31856813, 36447431, 364577, 395 87, G05B 1925, G06F 764
Patent
active
056708572
ABSTRACT:
A method is provided of an industrial controller, such as that used for controlling a robot or a computerized numeric controller, of returning to an absolute zero point. A main controller moves an axis toward a center sensor on the basis of a position signal of the axis received from right and left limit sensors and the center sensor, to determine an approximate position of the absolute zero point. A position controller then controls a motor by a position control command having an interpolated short time period and detects a zero-pulse generated from the motor, thereby determining the absolute zero point. Thus, the absolute zero point is always positioned in a predetermined place, and since the speed of detecting the zero-pulse can be determined by the position controller regardless of the main controller, the time for returning to the absolute zero point is reduced.
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patent: 4849678 (1989-07-01), Kamiguichi et al.
patent: 4980839 (1990-12-01), Souji et al.
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Cabeca John W.
Samsung Electronics Co,. Ltd.
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