Optical Encoder Mounted on Roller Guide for Elevator Positioning
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Solution Overview
Problem
Elevator systems experience disruptive oscillations and position inaccuracies due to stretching and contracting of load-bearing members, which existing technologies fail to effectively control, leading to vibrations and bounce motions.
Innovation Solution
An elevator monitoring system is integrated into the roller guide, featuring a motion state sensing assembly with an optical encoder and processor to detect and communicate motion states, including position, speed, and acceleration, to the elevator controller, enabling precise control and compensation for vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If load bearing members are used to move the elevator car, then the elevator car can be transported vertically, but stretching and contracting of the load bearing members causes disruptive oscillations and position inaccuracies
Solution Approach 1:
The patent implements a feedback control system using an optical encoder mounted on the roller guide to continuously monitor the elevator car's position and motion state. The encoder provides real-time feedback signals to the elevator machine controller, enabling the system to detect and compensate for position deviations caused by load bearing member stretching and contracting, thus resolving the contradiction between transport capability and position accuracy
Solution Approach 2:
The patent replaces traditional mechanical position measurement methods with an optical encoding system. The optical encoder uses optical fields instead of mechanical contact to detect the position of the roller guide, eliminating mechanical errors and providing more accurate position feedback to compensate for load bearing member variations
2Stability of the object's composition
If roller guides are mounted on the elevator car to limit movement, then lateral stability is improved, but the system complexity increases due to additional mounting and alignment requirements
Solution Approach 1:
The patent merges the roller guide mounting system with the position sensing system by integrating the optical encoder directly onto the roller guide structure. This combination eliminates the need for separate mounting brackets and alignment procedures, reducing overall system complexity while maintaining both lateral stability and position measurement capabilities
Solution Approach 2:
The roller guide is designed to serve multiple functions simultaneously: it provides lateral guidance and stability for the elevator car while also serving as the mounting structure for the optical encoder. This multi-functionality reduces the number of separate components and simplifies the overall system architecture
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
The system provides accurate motion state detection and control, minimizing vibrations and oscillations, ensuring precise positioning and stable elevator operation by transmitting data to the elevator controller for dynamic compensation and re-leveling.
Implementation Method 1
the optical encoder device is arranged to direct optical energy toward the optical target and detect a response of the directed optical energy
Data Source
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Figure 2A
AI summary
Elevator systems include an elevator car and a roller guide associated therewith. A roller is supported on a frame of the roller guide and configured to rotate along a guide rail and limit movement of the elevator car in a first direction. A motion state sensing assembly is mounted to the roller guide and configured to measure a motion state of the elevator car. The motion state sensing assembly includes an optical target located on the roller and an optical encoder device and associated a processor arranged to direct optical energy toward the optical target and detect a response thereof. A sensor housing is mounted to the roller guide with the optical encoder device arranged within the housing. A communication assembly is in communication with the processor and an elevator controller for communication therebetween.