Positioning control of ball screw system driven by DC motor

Ting , Tze Ter (2014) Positioning control of ball screw system driven by DC motor. Project Report. UTeM. (Submitted)

Text POSITIONING CONTROL OF BALL SCREW SYSTEM DRIVEN BY DC MOTOR 24pages.pdf Download (184kB)

Abstract

Ball screw driven by DC motor system is an electromechanical linear actuator that translates the rotational motion into a linear motion. There many application of ball screw system in industry especially the application of Computer Numerical Control (CNC) machine. The ball screw mechanism in this project is driven by DC motor. The DC motor is use because it is easy to setup and control, has precise rotation and most importantly is low cost. As for ball screw mechanism itself, has smooth motion, not easy to wear out and high mechanical efficiency. The problem is arise when the used of conventional PID controller in the ball screw system driven by DC motor shows less adaptability to the changes of system parameter. Therefore, the objective of this project is to design an adaptive fuzzy PID controller to overcome the limitation of conventional PID controller. The performances between the conventional PID controller and fuzzy PID controller will be compared in order to validate the robustness of the fuzzy PID controller. So this project is to compare the robustness of two proposed controllers by compare the results of ball screw table position when the parameter mass of load is set to vary. The experiment is start with designing the algorithms of fuzzy PID control and conventional PID controller, then the designed algorithm is apply onto the experimental that has been setup. The performances especially the transient response and steady state error between the controllers will be collect and compare. In the end of this project the results of system performance obtained after applying with fuzzy PID controller have lower positioning error and better performances of transient responses compared to conventional PID controller.

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