Modeling and Control of a High-Quality Electro-hydraulic Actuator Driven by an Induction Motor under Intelligent Indirect Vector Control

Abstract

Abstract Due to its excellent energy efficiency and broad speed range, the variable-speed electro-hydraulic drive is an appealing driving principle in many contemporary industrial applications. It is a primary control of linear motion by a variable speed electric motor driving a hydraulic actuator via a constant displacement pump. One of the most commonly used controllers for the speed control of induction motors is Proportional Integral (PI) type. However, the traditional PI controller has some disadvantages such as the high starting overshoot, sensitivity to controller gains, and sluggish response due to sudden disturbance. To overcome these defects, an intelligent controller based on PI Fuzzy logic set theory is introduced to the electro-hydraulic system. This paper presents a study on the speed control of an indirect vector controlled induction motor driving an electro-hydraulic actuator. Various techniques of speed control like voltage-frequency control, sinusoidal pulse width modulation PI control, indirect field control, and fuzzy logic PI control were applied in the electro-hydraulic system and simulated by Matlab/Simulink environment for performance analysis and comparison. The results prove that the indirect field-oriented control technique with PI fuzzy logic controller provides better speed control of the induction motor, especially with high dynamic disturbances. This, in turn, will improve the performance of the proposed electro-hydraulic system.