Elevator Support Structure for Ropeless Propulsion
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Solution Overview
Problem
Self-propelled elevator systems face challenges in reducing the excess weight of elevator cars while maximizing support structure strength to enhance efficient operation, particularly in high-rise buildings where ropeless systems are used.
Innovation Solution
A secondary portion of a linear electromagnetic propulsion system includes a first and second permanent magnet assembly with C-shaped support structures and a housing that provides structural support, optimizing weight reduction and strength by using fasteners and panels for assembly and rigidity, and potentially filling the housing with foam for additional support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the support structure strength is maximized to support permanent magnets of the propulsion system, then the structural reliability is improved, but the weight of the moving object increases
Solution Approach 1:
The support structure is divided into multiple discrete support structures spaced along the hoistway, each supporting a portion of the permanent magnet assembly. This segmentation allows for optimized local strength while reducing overall weight compared to a continuous support structure.
Solution Approach 2:
The support structures utilize composite construction with channels and panels that provide high strength-to-weight ratio. The housing enveloping the support structures creates a composite assembly that enhances structural integrity while minimizing weight, enabling the support of permanent magnets without excessive weight penalty.
2Weight of moving object
If multiple support structures are used to reduce weight, then the weight of the moving object is reduced, but the structural reliability deteriorates
Solution Approach 1:
Multiple discrete support structures are combined with a continuous housing that envelops them, creating an integrated assembly. The housing acts as a unifying element that ties the individual support structures together, providing continuous structural support along the hoistway while maintaining the weight benefits of discrete supports.
Solution Approach 2:
The support structures extend in multiple dimensions - vertically along the hoistway and laterally with channels and panels. This multi-dimensional configuration distributes loads more effectively across the structure, enhancing reliability while maintaining weight efficiency through optimized spatial arrangement.
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 enhances the structural support and reduces weight, enabling efficient propulsion of elevator cars in ropeless systems, improving the overall performance and efficiency of the elevator system.
Implementation Method 1
Self-propelled elevator systems... may propel the elevator cars via an electro-magnetic, linear, propulsion system
Data Source
AI summary
A secondary portion of a linear electromagnetic propulsion system is configured to propel an elevator car disposed in a hoistway that is defined by a stationary structure. The secondary portion includes a first permanent magnet assembly extending longitudinally along the hoistway. A plurality of support structures of the secondary portion are engaged to and extend between the elevator car and the first permanent magnet assembly. The support structures are further spaced from one-another along the hoistway. A housing extends between and substantially envelopes the plurality of support structures for structural support.