Elevator Linear Motor Cooling Conduit for Coil Heat Management
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Solution Overview
Problem
Existing self-propelled elevator systems face inefficiencies due to spatially varying heat loads on stator coils, leading to variance in coil efficiency and useful life, particularly in high-rise buildings where multiple cars travel in a single lane.
Innovation Solution
The implementation of a linear propulsion system with a cooling device featuring a conduit loop embedded in the mounting assembly, which includes cooling fins and a heat exchanger, along with a secondary portion with magnets, to manage heat dissipation and maintain efficiency across varying duty cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If linear motors with stator coils are used in self-propelled elevator systems, then multiple elevator cars can travel in a single lane, but spatially varying heat loads cause variance in coil efficiency and useful life
Solution Approach 1:
The patent applies local quality by implementing cooling devices at specific locations where heat generation is most intense. The cooling system is not uniformly distributed but strategically placed in high-duty-cycle zones to address localized thermal problems while maintaining overall system reliability and coil efficiency consistency
Solution Approach 2:
The patent changes thermal parameters by introducing active cooling mechanisms that modify the temperature profile of the coils. By controlling cooling fluid flow and heat dissipation rates, the system maintains optimal operating temperatures despite varying duty cycles, thereby preserving coil efficiency and extending useful life
2Adaptability or versatility
If linear motors with stator coils are used in self-propelled elevator systems, then multiple elevator cars can travel in a single lane, but spatially varying heat loads cause variance in coil useful life
Solution Approach 1:
The cooling devices are strategically positioned at locations experiencing highest thermal stress and duty cycles. This localized cooling approach extends the useful life of coils in critical areas without requiring uniform cooling across the entire linear motor structure, thereby maintaining multiple cars per lane capability while addressing coil longevity
Solution Approach 2:
The cooling system provides preventive thermal management by continuously removing heat before it can cause cumulative thermal damage to the coils. This beforehand cooling action protects against thermal degradation and extends the operational lifespan of the coils under varying load conditions
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 solution effectively addresses the inefficiencies by ensuring consistent cooling across the propulsion system, enhancing coil efficiency and extending their useful life, even under varying duty cycles, thereby improving the overall performance of the elevator system.
Implementation Method 1
a first cooling device including at least one conduit loop at least partially embedded in the mounting assembly for flowing cooling fluid
Implementation Method 2
the at least one conduit loop is made of a material having a coefficient of thermal conductivity that is about greater than 100 watts per meter kelvin
Implementation Method 3
along with a secondary portion with magnets, to manage heat dissipation and maintain efficiency across varying duty cycles
Implementation Method 4
a linear propulsion system configured to impart force to the elevator car, the linear propulsion system including; a first primary portion including a mounting assembly, a plurality of coils engaged to the mounting assembly
Data Source
AI summary
An elevator system includes an elevator car constructed and arranged to travel in a hoistway. A linear propulsion system of the elevator system is configured to impart a force upon the elevator car to control movement of the car. The linear propulsion system includes a secondary portion mounted to the elevator car and having a plurality of magnets. A first primary portion of the linear propulsion system includes a mounting assembly, a plurality of coils engaged to the mounting assembly, and a first cooling device including at least one conduit projecting outward from the mounting assembly and into the hoistway for transferring heat.