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Marine closed-loop motion control units receive commands from the bridge/control room, drive servo motors, and perform precise closed-loop control of position, speed, and torque. They are divided into two main categories: all-electric servo drives and electro-hydraulic servo amplification drive modules, widely used in ship propulsion, steering, deck machinery, and main engine speed control actuators.

　　I. Typical Application Locations on Ships

CPP Controllable Pitch Propeller System: Controls the controllable pitch propeller screw actuator, adjusts the blade angle in a closed loop, and achieves forward/reverse and speed regulation. Many drive electro-hydraulic servo valves.

Electric Steering Gear/DP Dynamic Positioning Rudder System: Receives automatic steering signals and precisely controls the rudder angle. DP ships have extremely high requirements for response speed and control accuracy, with an accuracy of ±0.1°.

Main Engine Speed ​​Control Actuator: The internal SERVO DRIVE mechanism of the Woodward speed control system drives the actuator motor and controls the fuel rack/throttle opening.

Deck Machinery: Cranes, winches, anchor winches, davits, achieving synchronous control of tension and position.

Roll Damping Devices and Hydrofoil Angle Control: Adjusting the angle of hydrofoils/roll damping fins to suppress hull roll.

ROV/AUV Underwater Robots: Thrusters, manipulator joint drives, compact, high-vibration-resistance servos.

Radar, Antenna, and Electro-optical Tracking Turntable: Attitude and pointing control for shipboard equipment.

　　II. Mandatory Environmental Requirements for Marine SERVO DRIVE

Classification Society Certification: CCS, DNV, ABS, LR, BV type approvals, mandatory requirements for merchant ships and offshore engineering.

Vibration and Shock Resistance: Meeting marine vibration and shock standards, resisting main engine vibration and wave impact.

Proof Coating: PCB board conformal coating, resisting salt spray, high humidity, and condensation corrosion.

Wide Temperature Range: Typical -40℃ to +70℃, suitable for high-temperature engine rooms and low-temperature open-air compartments.

Power Grid Adaptability: Withstands voltage dips and harmonic disturbances in the ship’s power grid; EMC electromagnetic compatibility ensures no interference with navigation or communication.

Alarm Output: Supports connection to ship alarm systems and uploads fault codes.

　　III. Mainstream Marine SERVO DRIVE Brands:

Woodward: Main engine speed control actuator SERVO DRIVE (EM-80/EM-300), diesel engine/steam turbine actuator driven, widely used in commercial ship main engines.

Elmo ExtrIQ: Military and marine grade, used in ROVs, turntables, and special vessels; high impact resistance and compact size.

Copley: Rugged marine servo, low-power DC shipboard equipment.

ABB: High-power servo, used in deck machinery and electro-hydraulic hybrid drives.

Kongsberg: Servo drive modules for steering gear and CPP systems.

Domestic: Wolong and Huichuan marine series, used on inland waterway and coastal engineering vessels.

　　IV. High-Frequency Faults on Ships

Salt Spray Corrosion: Corrosion of terminals, connectors, and PCBs; random overcurrent and communication interruptions.

Vibration and Loosening: Loose encoder cables and connectors; feedback loss, position drift, and irregular faults.

Ship’s Power Grid Disturbance: Power grid surges; overvoltage and undervoltage tripping shutdowns.

Poor Heat Dissipation: High engine room temperature; overheating leading to power reduction and alarms.

Encoder/Motor Matching Issues: Incompatibility between driver parameters and encoder protocol after replacing spare parts, resulting in inability to operate in closed-loop mode.

　　V. Key Points for Onboard Maintenance

Priority Checks: Power supply voltage, grounding, encoder cable securing, and cabin temperature.

Check driver alarm codes and refer to the manual to differentiate: driver hardware faults, motor faults, feedback faults, and external command signal faults.

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