Research On Electronic Cam With Electromagnetic Linear Actuator

More attention is paid to the electronic cam that utilizes control system to realize motor functions of traditional cam as a result of higher requirements of diversification,control accuracy,response speed as well as problems of mechanical cam structure(including manufacturing difficulties,large wear extent,low rate of accuracy and lack of flexibility etc.)The research studies an electronic cam,which is based on the self-developed electromagnetic linear actuator.By tracking the given trajectory,the study realizes the required linear motion law of follower and substitutes the traditional cam mechanism.The main contents of the research include the following aspects:(1)The reciprocating linear motion law curve of electronic cam is designed and studied in this part.The research shifts the form of motion curve of traditional mechanical cam mechanism from "displacement-angle" into "displacement-time" form of electronic cam.According to the definition of the non-dimensionlization,the research designs the non-dimensionnilization expressions of motion law curve,providing guarantees for the trajectory tracking of the following part.(2)The mathematical model and experiment system of electronic cam mechanism are respectively constructed and designed.In the first place,the research analyzes electronic cam mechanism from dynamics;at the same time,the electronic cam is broken down into circuit,magnetic circuit and machinery three subsystems and the research applies mathematical model analysis to three subsystems respectively.In the second place,the research constructs mathematical model and system simulation model.At last,the research designs the control system of electronic cam and constructs the corresponding experiment platform.(3)The iterative learning control algorithm is studied and applied to electronic cam control system.Taking advantage of the high precision and good stability of the repetitive trajectory tracking in the iterative learning control algorithms,the study applies it to the electronic cam controller and conducts simulation and experimental verification.The result shows that the actual tracking effect is poorer,and robust performance remains to be further improved.(4)The fuzzy sliding mode iterative learning control algorithm is proposed and applied to electronic carn control system.Due to the existing problems in iterative controller,the research studies the intelligent algorithm of the combination of the iterative controller and other advanced control technology.The study puts forward an algorithm,which is an algorithm superposition of sliding mode variable structure control and fuzzy control based on iterative control.Such algorithm effectively improves two circumstances:the poor robustness in iterative control and the fluttering in sliding mode variable structure.Through simulation and experiments,the result suggests that the fuzzy sliding mode iterative control has the preponderance of high tracking precision,fast response speed,fast convergence speed and strong robust performance.(5)The practical experiment proves that the electronic cam,which is based on the self-developed electromagnetic linear actuator,is applied with fuzzy sliding mode iterative learning control algorithm,accurately tracking 5ms-cycle and ±3mm-route sine trajectory.And tracking accuracy can reach less than 1%of the total trip.Therefore,the study verifies the feasibility that the electronic cam could substitute the traditional mechanical cam.