Servo Systems with Pump Speed Control

Simple servo systems, which do not use hydraulic servo valves or high-speed proportional valves, can be made by controlling the pump rotation speed with a servo motor. Fig. 9.13 shows an example of a simple servo system with pump speed control (IH servo drive pack). The IH servo drive pack is a compact and energy-saving hydraulic power source consisting of an AC servo motor, piston pump, reservoir, and closed hydraulic control circuit. This unit controls the pump discharge and pressure by adjusting the pump rotation speed. It can be combined with a sensor-equipped cylinder and a dedicated controller to facilitate the configuration of a position, speed, and pressure control system.

IH servo drive pack

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