US 4,891,568 AGranted

Servo motor system for transportation

AssigneeToyota Jidosha Kabushiki Kaisha

InventorsYoichi Shibata, Naoto Tazuke, Yoshio Shinohara, Akira Shima

Life of this patent

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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.

Claims6

Dependent claims

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.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/239,368Filed 1 Sep 1988
Priority: JP 62-2213274 Sep 1987
Granted: 2 Jan 1990
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G05B 19/237
The positional error is used to control continuously the servomotor according to its magnitude: with a combination of feedback covered by…
G05B 2219/42213
Servomotor, servo controller kind till VSS: position overshoot, axis still moves after stop
G05B 2219/50024
Machine tool, machine tool null till machine tool work handling: go to reference, switches and dog to decelerate and to detect origin
G05B
Control or regulating systems in general