Design And Research On High-precision Electric Actuator

Electric actuator is an important execution unit during the process ofindustrial automation. It is mainly used in the performance of the fluid flowcontrol in industrial. With the improvement of process industry that it requiredthe improvement of product quality, the demand of actuator perform precision ishigher, and the demand of control valve market is also expanding. In order tomeet the needs of industrial production, and break the foreign monopoly in thisarea at the same time, it is imperative to develop the high-precision electricactuators with independent intellectual property rights. In order to improveresponse speed and control precision, this paper does some research work ondynamic characteristics and control strategies of electric actuators, then developsa new high-precision electric actuator. Through the study of the mathematicalmodeling to analyze the electric actuator. Through MATLAB simulation to carryon the mathematical model which to analysis and research the dynamiccharacteristics and the control system performance, finally validated by testingthe electric actuators. The main work of this article are as follows:（1）High precision electric actuator is designed and types for maincomponents are selected. Through learning electric actuator products at homeand abroad, design an electric actuator according to the working principle ofelectric actuator, on this basis of specific condition requirements, selection themain instruments of motor and design the drive system, the electric actuator hasmanual institutions, it can carry on the manual regulation during the powerfailure. Besides, in order to ensure safety and stably operation of the actuator, italso designed with security protection mechanism which includes angular travellimit switches, fault alarm and so on.（2）The high precision electric actuator controller is designed. Thecontroller is designed according to functional requirements of high precisionelectric actuators as the core of single chip microcomputer, its features includeLCD, data collection and hazard warning. The design of controller can be divided into hardware design and software programming. The design of thehardware design includes various parts of the controller circuit diagram,hardware circuit diagram are completed in the Altium Designer drawingsoftware. The part of Software implement means the main program andsubroutine programming.（3）Established the mathematical model of high precision electric actuatorand analyze the stability of its performance. According to the working principleof electric actuator, set up the dynamic mathematical model of electric actuator.include the model of the motor, the model of drive mechanism, through theanalysis of the relationship of each model, deduced the system transfer function,using the MATLAB simulation Bode diagram to analyze the stability of thesystem.（4）Research on mechanical clearance error compensation of electricactuator. For the cause of mechanical clearance error，a reverse mechanicalclearance software compensation algorithm is designed. The realization ofsoftware compensation of mechanical clearance. Electric actuator performprecision is improved.（5）Debugging the high precision electric actuators. By selecting the debugrequired equipment, debugging on all aspects of the electric actuator, whichincluding zero debugging, stroke debugging and opening detection precision,and so on, through the test of electric actuators to get the data, by analysis of thestability of electric actuators, anti-jamming and fast response performance, verifythe established mathematical model. After debug to find problem in electricactuators, put forward feasible solutions.