Method of controlling electronic cam and servo motor control system

Abstract

The present invention provides an electronic cam control method in which displacement points, accelerations, and the like can be smoothly connected between a synchronous control section and an asynchronous control section, without vibration. This is a control method of an electronic cam using a servo motor. There is a synchronous control section in which the control object is moved at a constant speed, and an asynchronous control in which the control object is moved from the end position of the synchronous control section to the start position of the next synchronous control section interval, the control in the asynchronous control interval uses a quintic function for the position control of the electronic cam, uses a quartic function for the speed control of the electronic cam, and uses a cubic function for the acceleration control of the electronic cam, so that the control makes the asynchronous The operation of the electronic cam near the change point of switching between the control interval and the synchronous control interval is smooth.

Description

technical field [0001] The invention relates to a control method of an electronic cam and a servo motor control system. Background technique [0002] Various industrial machines such as packaging machines use speed-controllable motors such as servo motors as drive sources. The packaging machine includes: a film supply unit that continuously draws out a tape-shaped packaging film and supplies it to the packaging machine body; a packaged object supply unit that supplies the packaged object to the packaging machine body at predetermined intervals; and the packaging machine body. The main body of the packaging machine is appropriately processed (eg, cylindrical bag making, bag molding) so that the packaged object can be wrapped with the supplied packaging film, and the packaged object is accommodated in the processed packaging film. And the to-be-packaged object is conveyed in the state accommodated in the packaging film, and each package body is manufactured by sealing and cut...

AI Technical Summary

Problems solved by technology

In particular, as the number of manufactured pieces per unit time increases, the demand for high-speed operation increases, and vibrations are likely to occur near the change point from the asynchronous control area to the synchronous control area, which becomes an obstacle to high-speed control.

[0017] Furthermore, in the method of generating a cam table for electronic cam control offline, the synchronization start position, synchronization range, and synchronization ratio of the synchronization curve in offline are changed, or specific points are passed in order to prevent mechanical interference, etc. Instructions for changing the asynchronous cam curve cannot be generated and carried out in real time, and the cam table needs to be regenerated, which reduces efficiency

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