ZF-S200 Series Hydraulic Servo Drive Systems

Hydraulic Servo Drive Systems are control systems that utilize hydraulic power to achieve high-precision, high-response-speed servo control. They are widely applied in industrial fields requiring high power, high load stiffness, and rapid dynamic response. The core principle involves precise tracking of input signals (such as position, speed, or force) by hydraulic actuators (e.g., hydraulic cylinders or motors) under closed-loop control, enabling efficient and stable motion control.

I. Working Principle

1. Signal Input and Comparison
   The system receives external input signals (e.g., position commands) and compares them with feedback signals (actual position, speed, or force) to generate an error signal.

2. Controller Processing
   A controller (e.g., PID controller) calculates the control quantity based on the error signal and outputs an electrical signal to the servo valve.

3. Servo Valve Regulation
   The servo valve converts the electrical signal into a hydraulic signal, adjusting the flow rate and pressure of hydraulic oil to drive the hydraulic actuator.

4. Actuator Movement
   The hydraulic actuator (e.g., hydraulic cylinder) generates displacement or force to drive the load.

5. Feedback Detection
   Sensors (e.g., displacement sensors, pressure sensors) continuously monitor the actuator’s output and send feedback signals back to the controller, forming a closed-loop control system.

II. System Composition

• Hydraulic Power Source: Hydraulic pump station providing high-pressure hydraulic oil.
• Servo Valve: High-precision electro-hydraulic servo valve for electrical-to-hydraulic signal conversion.
• Actuator: Hydraulic cylinder or motor driving the load.
• Sensors: Displacement, speed, and force sensors for feedback signals.
• Controller: PLC, DSP, or dedicated motion controller implementing control algorithms.
• Auxiliary Components: Oil tank, filters, coolers, pipelines, etc.

III. Technical Features

1. High Power Density
   Capable of delivering high power, suitable for heavy-load and high-inertia applications.
2. High Response Speed
   Servo valve response time can reach milliseconds, ideal for dynamic control.
3. High Load Stiffness
   Exhibits high stiffness and strong resistance to disturbances.
4. Precise Control
   Closed-loop control achieves micron-level position accuracy and low-speed stability.
5. Wide Adjustable Range
   Enables speed and force control over a broad range by regulating hydraulic oil flow and pressure.

IV. Applications

• Aerospace: Flight simulators, landing gear retraction, rudder surface control.
• Industrial Automation: Injection molding machines, die-casting machines, stamping presses, machine tool feed systems.
• Energy: Wind turbine blade pitch control, hydro turbine governors.
• Marine: Steering gear systems, fin stabilizers.
• Metallurgy: Rolling mill pressure systems, continuous casting mold vibrators.
• Testing Equipment: Material testing machines, vibration tables, fatigue testers.

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