Escalator Motor Mode Switching for Load-Based Energy Saving
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current energy-saving control logic for escalator and moving walkway systems, which determines motor connections based on load, does not achieve satisfactory energy-saving effects.
Innovation Solution
A device and method that determines the operating mode of a three-phase motor in escalator or moving walkway systems by assessing load values, switching between variable frequency, first operating frequency, and second operating frequency modes, with windings wired in star and triangular configurations respectively, based on load thresholds, using photoelectric counting and pressure sensors to determine load values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If control logic determines motor connections based on load to save energy, then energy consumption is reduced, but the energy-saving effect is not satisfactory
Solution Approach 1:
The patent applies parameter changes by switching between star and triangular wiring methods based on load thresholds, and by adjusting motor operating frequencies (variable frequency mode, first operating frequency mode, second operating frequency mode). This dynamic parameter adjustment optimizes motor efficiency across different load conditions, resolving the insufficient energy-saving effect while reducing overall energy consumption.
2Use of energy by moving object
If windings are switched between star and triangular wiring methods based on load, then motor efficiency is optimized, but control complexity increases
Solution Approach 1:
The control device changes wiring parameters (star/triangular) and operating frequency parameters based on detected load values compared to predetermined thresholds. This parameter-based control strategy optimizes motor efficiency across different operating conditions while maintaining manageable control complexity through systematic threshold-based decision logic.
3Loss of energy
If multiple operating modes are implemented for different load values, then energy-saving performance is enhanced, but device complexity increases
Solution Approach 1:
The system implements three distinct operating modes (variable frequency mode, first operating frequency mode with star wiring, second operating frequency mode with triangular wiring) selected based on load value thresholds. This multi-mode approach enhances energy-saving performance by matching optimal operating parameters to specific load conditions, while the threshold-based selection keeps device complexity manageable.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Optimizes motor efficiency by adjusting operating modes according to load, reducing energy consumption and enhancing the energy-saving performance of escalator and moving walkway systems.
Implementation Method 1
receiving a count value from a photoelectric counting device arranged near an entrance and exit of a conveying mechanism
Implementation Method 2
receiving a pressure signal from a pressure sensor arranged near an entrance and exit of a conveying mechanism
Implementation Method 3
windings of the three-phase motor are wired in a star wiring method and in a triangular wiring method in the first and second operating frequency modes, respectively
Data Source
AI summary
A method includes determining a load value of a system; and determining a current operating mode of a three-phase motor in the following manner: if the load value is below a first threshold, determining a variable frequency mode as the current operating mode, if the load value is between the first threshold and a second threshold, determining a first operating frequency mode as the current operating mode, and if the load value exceeds the second threshold, determining a second operating frequency mode as the current operating mode, the second threshold is greater than the first threshold, the windings of the three-phase motor are wired in a star wiring method and in a triangular wiring method in the first and second operating frequency modes, respectively.