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Closed-loop synchronization of electric hoists on stage

2025-09-26

rizhi

Stage Electric Hoist Closed-Loop Synchronization – “Feedback-Based Automatic Error Correction” Core Components: 1. Encoder: Installed on the motor of each electric hoist. It functions like a “milemeter,” measuring the number of revolutions the motor has made, thereby determining the length of the chain that has been retracted or extended (i.e., the position information). 2. Main Controller (PLC): The brain of the system. It receives the position data from the encoders and continuously compares it. 3. Inverter: Each hoist is equipped with its own inverter, which executes the commands from the PLC. The PLC uses the inverter to precisely control the speed and direction of each motor. Working Principle (Taking “Position Synchronization” as an Example): 1. Set the Target: The operator specifies the total lifting height (for example, 5 meters). 2. Real-Time Monitoring: The encoders of all hoists continuously send real-time position information to the PLC. 3. Comparison and Correction: The PLC calculates the average position of all the hoists; it can also designate one hoist as the master hoist and the others as slave hoists. If it detects that the position of any slave hoist deviates from that of the master hoist or the average value, the PLC immediately sends a fine-tuning command to the inverter of that hoist: instructing the lagging hoist to accelerate slightly and the leading hoist to decelerate slightly. 4. Continuous Process: This “monitoring-comparison-correction” process occurs without interruption throughout the entire lifting process, ensuring that all lifting points remain at the same horizontal level. Advantages: High precision, good safety performance, and a high degree of automation.

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