Engineering and Technology Journal

Modeling and control of a high-quality electro-hydraulic actuator driven via an induction motor under intelligent indirect vector control

Document Type : Research Paper

Authors

Electromechanical Engineering Dept., University of Technology-Iraq, Alsina’a street, 10066 Baghdad, Iraq.

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. A primary control of linear motion is via 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 the 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. An intelligent controller based on PI Fuzzy logic set theory is introduced to the electro-hydraulic system to overcome these defects. This paper presents a study on the speed control of an indirectly controlled vector-controlled induction motor driving an electro-hydraulic actuator. Various speed control techniques 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 control provides better speed control of the induction motor, especially with high dynamic disturbances, by reducing the steady state error to (0.024), overshooting to (0.2%) and Settling time to (0.3s). This, in turn, will improve the performance of the proposed electro-hydraulic system.

Graphical Abstract

Highlights

  • The smart PIFLC & IVC controller demonstrated superior performance
  • Smart PIFLC & IVC outperformed PI controllers and V/f in cost, stability, and response
  • PIFLC & IVC achieved a low starting current of 15A
  • Energy savings of 15% were obtained, improving efficiency with an 80V reduction
  • The steady-state error in PIFLC & IVC was minimal at 0.024

Keywords

Main Subjects

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