การควบคุมแรงในระบบอิเล็คโตรไฮดรอลิกส์ที่ควบคุมอัตราการไหลโดยปั๊มที่ขับด้วยเอซีเซอร์โวมอเตอร์

Tossapol Jangnoi; Pisan Moonumca

Authors

Tossapol Jangnoi Department of Mechanical Engineering, Faculty of Engineering, Rajamangala University of Technology Isan, Khon Kaen Campus, Muang, Khon Kaen 40000, Thailand.
Pisan Moonumca Department of Mechanical Engineering, Faculty of Engineering, Rajamangala University of Technology Isan, Khon Kaen Campus, Muang, Khon Kaen 40000, Thailand.

Keywords:

force control, electro-hydraulic system, pump control, AC servo motor

Abstract

This paper studies the force control in an electro-hydraulic system that controls the hydraulic oil flow rate using a gear pump whose speed is regulated by an AC servo motor. The time response performance and power consumption of the proportional valve flow control system and the pump flow control system driven by AC servo motor were compared. The proposed system comprises an AC servo driven power unit that controls motor speed, a proportional hydraulic directional and flow control valve, and a hydraulic cylinder. A computer was used to control the electro-hydraulic system. A PID controller was used to control the valve operation and the motor speed that drives the pump. Both systems were subjected to 3 types of reference force signals which are a step force signal at 2,500 N, a sinusoidal force signal ranging from 1,500 N to 3,500 N at 0.2 Hz, and a square force signal ranging from 1,500 N to 3,500 N at 0.2 Hz. This results indicate that the pump flow control system driven by AC servo motor exhibited more accurate rise time, setting time, and steady state error responses compared to the proportional valve flow control system. However, it has an overshoot that is less favorable. The power consumption of the pump flow control system driven by AC servo motor was significantly lower than the proportional valve flow control system.

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