Elevator Synchronization Run Using Magnetic Magnet Detection
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Solution Overview
Problem
Existing elevator systems face challenges in achieving accurate absolute positioning, particularly in systems with long distances between landings, due to limitations in existing technologies such as ultrasonic, magnetic tape, and code tape systems, which are often costly and have restricted traveling heights.
Innovation Solution
The proposed method involves a synchronization run where the elevator detects magnets in the shaft, compares identification codes to stored pre-information, and adjusts speed accordingly, using a pulse sensor unit and door zone sensor unit to define absolute position information by adding a correction value to the obtained pulse position information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultrasonic position system is used for absolute positioning, then positioning accuracy is improved, but equipment cost and installation cost increase
Solution Approach 1:
The patent replaces expensive ultrasonic position systems with inexpensive magnetic tapes that can be easily installed and replaced. The magnetic tape serves as a disposable, low-cost positioning reference that eliminates the need for costly ultrasonic transmitters and receivers while maintaining adequate positioning accuracy for elevator safety functions.
Solution Approach 2:
The patent substitutes the mechanical ultrasonic positioning system with a magnetic field-based detection system. Instead of using ultrasonic waves and complex transducers, the system uses magnetic tapes with magnetic markers detected by Hall sensors, simplifying the mechanical complexity while achieving the required positioning precision.
2Measurement precision
If magnetic tape with Hall sensors is used for absolute positioning, then positioning accuracy is improved, but equipment cost increases
Solution Approach 1:
The patent uses magnetic tapes as a simple copy or representation of position information along the elevator shaft. Instead of complex active sensing systems, the magnetic tape provides a passive, low-cost copy of position data that can be read by Hall sensors, significantly reducing equipment cost while maintaining positioning accuracy.
3Measurement precision
If code tape with mounting clips is used for positioning, then floor level identification is improved, but cost increases and door side identification capability is lost
Solution Approach 1:
The patent enhances the magnetic tape system to provide multiple functions: it not only identifies floor levels but also indicates which door is on the front side and which is on the rear side of the elevator car. This multi-functionality is achieved by encoding additional information in the magnetic tape pattern, eliminating the need for separate mounting clips and cameras while reducing cost and increasing capability.
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
This approach enables faster landing arrival and quicker recovery after stopping between floors, particularly in long elevator shafts, while reducing costs by utilizing existing components and ensuring SIL3 level accuracy requirements are met.
Implementation Method 1
a pulse sensor unit configured to obtain continuously a pulse position information of the elevator car
Implementation Method 2
a door zone sensor unit configured to detect a magnet of the elevator shaft
Data Source
AI summary
A method for performing a synchronization run for an elevator car stopped between floors—upon initiating the synchronization run, driving the elevator car at a low speed in order to detect a first magnet of the elevator shaft, detecting the first magnet of the elevator shaft, comparing the identification code of the detected first magnet to stored pre-information in order to identify the detected first magnet, in response to identification of the first magnet, generating a control signal to the elevator car to travel up to an elevator rated speed, and driving an elevator car with an elevator rated speed.