The purpose of this paper is to develop a pneumatic servo drive mechanism, which is the basis of high performance pneumatic servo gun for resistance spot welding. In order to increase the output force and reduce costs, booster cylinder and high speed solenoid valve are included in the system. In this paper, a mathematical model of the pneumatic force servo system is derived. Pulse-Width-Modulation control scheme is given to control the solenoid valves. Computer simulation results and experimental results show that the designed pneumatic servo force system has a good performance, which verifies the feasibility of the designed scheme.

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