Servo motor system for transportation
First Claim
1. A servo motor system for controlling a servo motor of a transportation line, the system comprising:
- a distance setting means for setting a distance to be traveled by an article and for generating a distance signal representative of the distance;
an incremental detector for generating an incremental distance signal representative of an incremental distance the article is actually moved by the servo motor;
a controller responsive to the set distance signal and the incremental distance signal for generating a control signal for operating the servo motor to move the article as far as the set distance based on a coordinate system corresponding to a total movable space of the article;
an external signal generator provided at a destination point for generating a stop signal responsive to an arrival of the article at the destination point; and
an initial setting means for transmitting the stop signal to the controller one time subsequent to the starting of the operation of the servo motor system at times when the article is located at a position other than the destination point, for establishing the coordinate system.
1 Assignment
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Accused Products
Abstract
A servo motor system for a transportation line with the travel distance of the article predetermined and with a relatively low positioning accuracy. Basically, the system is constructed as an incremental servo motor system in which an incremental movement of the motor is detected, and the incremental movement signal is fed back to a motor driver, which also receives pulse signals from a controller corresponding to a traveling distance to a destination. Only one time after starting the operation of the servo motor system with the article not at the destination point, a stop signal is fed from an external signal generator located at the destination point to the motor driver, which stops the motor there. At this time, a coordinate system of the movable space of the article is established in the controller and the servo motor system is operated as an incremental system from the second time on, without utilizing an external signal generator.
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Citations
6 Claims
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1. A servo motor system for controlling a servo motor of a transportation line, the system comprising:
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a distance setting means for setting a distance to be traveled by an article and for generating a distance signal representative of the distance; an incremental detector for generating an incremental distance signal representative of an incremental distance the article is actually moved by the servo motor; a controller responsive to the set distance signal and the incremental distance signal for generating a control signal for operating the servo motor to move the article as far as the set distance based on a coordinate system corresponding to a total movable space of the article; an external signal generator provided at a destination point for generating a stop signal responsive to an arrival of the article at the destination point; and an initial setting means for transmitting the stop signal to the controller one time subsequent to the starting of the operation of the servo motor system at times when the article is located at a position other than the destination point, for establishing the coordinate system. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification