Research On The Actuator Of A Kind Of Electric Pneumatic Composite Actuator

Electric actuator has the advantages of simple structure, high positioning accuracy,strong anti-interference ability.when the load mass is larger, electric actuator motor power need supply continuously,which means that when the electric actuator act tje positioning movement, the electrical energy is cost greatly.The cylinder has the advantages of simple structure and high performance price ratio. As the actuator of pneumatic system, the output of aerodynamic force is large. However, as the actuator of pneumatic position servo system, the position accuracy of pneumatic position servo system is not high due to the influence of nonlinear factors such as friction force of the cylinder. In order to solve the problem on low positioning accuracy of pneumatic servo system and the energy consumption of high power electric actuator,In this paper, a new type of electronic and pneumatic composite actuator is developed. The electric pneumatic composite actuator is connected with the output end of the cylinder piston rod and the small power electric actuator.In the vertical mode, through the force of the cylinder of output to balance the load quality of gravity.When the pressure of the electric actuator is under the load of the electric actuator, the electric actuator drives the piston rod of the cylinder and the movement of the load. In the composite actuator, the electric actuator provides the position and speed, and the cylinder provides the force acting on it.This paper firstly introduces the application status of the electric actuator and its advantages and disadvantages compared to the pneumatic actuator. In this paper, the research status of the pneumatic balance system, pneumatic position servo system and how to reduce the friction of the cylinder are summarized, and the research status of the variable load system is summarized.Then, this paper introduces the basic knowledge of DC servo motor, including the structure principle, basic characteristics and so on. The mathematical model derivation of precise and concise DC servo motor is presented. Through the mathematical model of DC servo motor, electric actuator drive system model, completed the DC electric servo actuator model is built, and the simulation analysis, including the start-up characteristics of DC electric servo actuator, bearing characteristics, the anti-interference characteristics etc.Thereafter, this paper designs the known load electric-pneumatic composite actuator controller, respectively, the composite actuator vertical upward and downward vertical, sequential action of simulation analysis, the simulation results of controller wasimproved, and composite executive device in vertical upward and downward vertical,order action action positioning control is realized by the improved controller simulation On the basis of the electronic pneumatic actuator controller of the known load.This paper continues to study the variable load of the electric-pneumatic composite actuator.Using the designed controller,the simulation on electric-pneumatic composite actuator of the mass load simulation studied including vertical upward and downward vertical and two action and action orientation control. In the case of uncertain load quality, the pneumatic force balances the gravity of the load, the electric actuator drives the load and the cylinder piston rod can be realized and the positioning action can be achieved.Finally, in this paper, the position control experiment is carried out on the composite actuator in two cases, known as the load and the unknown load. Through the design of the controller of the simulation, the positioning control of the load known and two kinds of load is completed, and the positioning accuracy of the composite actuator system is very high.