Grounding Roller for Elevator Car Static Charge Dissipation
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Solution Overview
Problem
Elevator systems without conductive connections to the building shaft experience static charge buildup due to friction and magnetic fields, leading to voltage peaks during discharge, which can damage electrical components and pose health risks, especially when passengers enter or exit, and create communication issues due to differing electrical potentials.
Innovation Solution
An elevator system with a first roller providing a permanent conductive connection between the car and the guide rail, designed as a grounding roller with specific electrical resistance and materials to prevent voltage peaks and ensure stable electrical contact, using conductive additives in the roller's running body and a resilient mounting system to maintain contact without excessive mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If no conductive connection is provided between the elevator car and the guide rail, then the car structure remains simple and manufacturing is easier, but static charge builds up during travel causing voltage spikes that damage electrical components and pose health risks
Solution Approach 1:
The patent introduces a grounding roller as an intermediary element between the elevator car and the guide rail. This roller provides a controlled conductive connection that allows static charge to be discharged to ground potential, preventing dangerous voltage spikes while maintaining mechanical simplicity. The grounding roller acts as a mediator that resolves the contradiction by enabling safe charge dissipation without requiring complex conductive structures.
2Reliability
If a conductive connection is provided between the elevator car and the guide rail, then static charge buildup is prevented, but the device complexity increases due to additional grounding components
Solution Approach 1:
The grounding roller serves multiple functions simultaneously: it provides mechanical guidance for the elevator car, enables conductive connection for static charge dissipation, and acts as a grounding path to earth potential. By combining these functions into a single component, the patent reduces device complexity while maintaining reliability, as the same structure that guides the car also handles the electrical grounding function.
3Reliability
If the roller is made highly conductive to prevent charge buildup, then electrical safety is improved, but the roller may experience excessive mechanical stress and wear
Solution Approach 1:
The grounding roller is constructed as a composite structure with a conductive core (such as metal) surrounded by a resilient or耐磨 coating (such as rubber or plastic). This composite design allows the roller to maintain high electrical conductivity through the core while the outer layer provides mechanical protection, reduces wear, and cushions against excessive forces from the guide rail, thus balancing electrical safety with mechanical durability.
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 effectively prevents static charge buildup and voltage peaks, ensuring safe and reliable electrical operation and communication by maintaining a stable, defined potential between the elevator car and the guide rail, even during movement and changes in direction.
Implementation Method 1
the first roller is designed as a grounding roller... a permanently electrically conductive connection between the car and the guide rail is provided via the first roller
Implementation Method 2
This is due, firstly, to the friction of the plastic rollers against the guide rails
Implementation Method 3
Secondly, the magnetic fields of the linear drive also cause charge separation in conductive elements of the car
Data Source
Figure 1
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AI summary
The invention relates to an elevator system comprising at least one elevator car (28) that can be moved in an elevator shaft along a guide rail (52). At least one first roller (54) is arranged between the elevator car (28) and guide rails (52), said first roller (54) being designed as a grounding roller. In this way, the elevator car (28) is prevented from being electrostatically charged during travel.