Escalator Motor Wiring Mode Switching Using Slip Rate
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Solution Overview
Problem
Current control logic for determining motor connections in escalators based on load cannot achieve the desired energy-saving effect due to lack of control accuracy.
Innovation Solution
A device and method that use a processor and computer program to determine the operating modes of an AC asynchronous three-phase motor in an escalator system by calculating the slip rate, switching between triangular and star wiring modes based on predefined thresholds to optimize energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If passenger counting systems are used to determine motor operating modes, then control accuracy is improved, but system cost increases
Solution Approach 1:
The patent replaces the mechanical/optical passenger counting system with an electrical parameter-based detection system. By measuring motor current, voltage, and power consumption, the system determines passenger load without requiring complex sensing hardware. This substitution maintains control accuracy while significantly reducing system cost and complexity.
Solution Approach 2:
The patent introduces motor electrical parameters (current, voltage, power) as intermediary indicators to infer passenger load. Instead of directly counting passengers, the system uses these easily measurable electrical quantities as mediators to determine when to switch between star and triangle motor connections, achieving accurate control through indirect measurement.
2Use of energy by moving object
If star wiring mode is used for energy saving, then energy consumption is reduced, but control accuracy deteriorates under varying load conditions
Solution Approach 1:
The patent implements dynamic switching between star and triangle wiring modes based on real-time detection of motor electrical parameters. The control system continuously monitors current, voltage, and power consumption, and automatically adjusts the motor connection configuration to match the actual load conditions. This dynamic adaptation ensures energy efficiency during light loads while maintaining control accuracy during heavy loads.
Solution Approach 2:
The patent changes the motor's electrical connection parameters (star/triangle configuration) based on detected load conditions. By monitoring electrical parameters such as current and power consumption, the system determines when to switch between different wiring modes, thereby optimizing the balance between energy consumption and control accuracy across varying operational conditions.
Data Source
AI summary
A device and method for determining operating modes of an AC asynchronous three-phase motor in an escalator system and computer-readable storage medium on which a computer program for implementing the method is stored. The operating modes include a first operating mode and a second operating mode, the AC asynchronous three-phase motor adopts a triangular wiring mode and a star wiring mode in the first operating mode and the second operating mode, respectively, the device includes: a memory; a processor coupled with the memory; and a computer program stored on the memory and running on the processor, the running of the computer program causes: A. obtaining a slip rate of the AC asynchronous three-phase motor; and B. determining whether the AC asynchronous three-phase motor needs to be switched between the first operating mode and the second operating mode based on the slip rate.