Elevator Cabin Door Linear Motor Profile Mechanism
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Solution Overview
Problem
Traditional elevator cabin door mechanisms are cumbersome and difficult to install due to their large vertical dimensions, and they often require complex and costly motor-belt-pulley systems, which hinder the reduction of head and pit dimensions in elevator systems.
Innovation Solution
A cabin door system with two sliding door panels and counter-shaped profiles, where motorized means such as motors, gearmotors, or linear magnetic induction motors drive the profiles to move the door panels between closed and open configurations, reducing vertical dimensions and eliminating the need for auxiliary thresholds, with guide rails ensuring smooth operation and load detection for safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional motor-belt-pulley systems are used to slide door panels, then the door panels can be moved between open and closed positions, but the vertical dimensions become large (up to 750 mm height) making installation difficult
Solution Approach 1:
The patent replaces the traditional motor-belt-pulley mechanical system with a linear magnetic induction motor system. The linear motor uses electromagnetic fields to directly move the door panels along guide rails, eliminating the need for belts, pulleys, and complex mechanical linkages. This substitution reduces the vertical dimension from 750 mm to approximately 150-200 mm while maintaining the door sliding function.
Solution Approach 2:
The invention changes the orientation and arrangement of the door mechanism components. Instead of stacking mechanical components vertically (motor above or below door panels), the linear motor system distributes components along the horizontal axis and uses guide rails for vertical guidance, effectively redistributing the mechanism's footprint from vertical to horizontal dimensions.
2Ease of operation
If traditional motor-belt-pulley systems with trolleys are used, then door panels can be moved, but the structure becomes complex and installation becomes difficult
Solution Approach 1:
The patent eliminates complex mechanical transmission elements (belts, pulleys, trolleys, synchronization mechanisms) by using linear magnetic induction motors that provide direct drive. Each door panel has its own linear motor, simplifying the overall system architecture and reducing the number of moving parts and mechanical linkages.
Solution Approach 2:
The door system is divided into independent modules, with each door panel having its own linear motor and control system. This segmentation allows for simpler individual components that can be independently installed and maintained, reducing overall system complexity compared to a centralized mechanical transmission system.
3Ease of operation
If traditional motor-belt-pulley systems are used, then door panels can be slid, but costs increase due to complex mechanisms
Solution Approach 1:
The replacement of mechanical transmission systems with linear magnetic induction motors eliminates the need for manufacturing and assembling complex mechanical components like precision pulleys, belts, and synchronization mechanisms. The linear motor system uses standard electromagnetic components that are easier and less expensive to manufacture at scale.
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 solution significantly reduces the vertical height of the cabin door, simplifies the structure, and lowers costs by eliminating the need for complex mechanisms and auxiliary thresholds, while ensuring safe and smooth operation with minimal space between the cabin and floor doors.
Implementation Method 1
the motorised means comprise at least one linear magnetic induction motor operatively active on one of the profiles to move it
Data Source
Figure 1a
Figure 1b
Figure 2
AI summary
Cabin door (1) for an elevator comprising: two sliding door panels (2, 3) provided with corresponding profiles (6, 7) counter-shaped with one another, each of the profiles (6, 7) being arranged beneath the corresponding door panel (2, 3) and being integrally constrained to it; a motor (2) or a gearmotor or a linear magnetic induction motor operatively active on the profiles (6,7) to slide them with respect to one another so that said door panels (2,3) are indirectly moved between a first configuration wherein the cabin door (1) is closed and a second configuration in which the cabin door (1) is open; each of said profiles (6, 7) comprises a first portion (6a, 7a) integrally constrained to the corresponding door panel (2, 3) and a projecting second portion (6b, 7b), as a result of sliding of the profiles (6, 7) said projecting second portions (6b, 7b) assuming a position of minimum distance when the door panels (2, 3) are in the second configuration, so that said projecting second portions (6b, 7b) form a cabin threshold (5), and a position of maximum distance when the door panels (2, 3) are in the first configuration, so that said cabin threshold (5) is disassembled.