Design of electronic cam control system based on PLC

 

GAO Kun1, ZHANG Senlin2

(1. State Nuclear Power Demonstration Plant CO.LTD, Weihai 264200, China;

2. School of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

 

Abstract: Aiming at the disadvantages of conventional mechanical cam: points or lines contact,highpressure,easy to wear,noise,difficult to machine,an electronic cam was designed.The cam motion characteristics,motion curve,motorcontrol,servo control was studied,a design of electronic cam control system based on Mitsubishi Q series PLC was proposed with double CPU servo control, which can deal with the sequential control and motion control, the control precision and control efficiency was improved. A closed loop control mode was employed.The servomotor′s position and speed instructions were calculated by the position encoder,which drive the push rod move straightly back and forth.At the same time, as a comparison with electronic cam, a mechanical cam structure was maded.The experiment results indicate that any kinds of reciprocating motion can be gained by using the electronic cam.By adjusting the input curve of electronic cam, the effect of completely replacing the mechanical cam can be realized.

Key words: electronic cam; PLC; motion control; servo amplifier; servo motor