Elevator Wireless Power Coil Layout for Charging in Motion
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Solution Overview
Problem
The existing wireless power supply systems, such as the one disclosed in PTL 1, face inefficiencies in power delivery due to the requirement for the power reception coil to stop opposite the power transmission coil, leading to prolonged stop times and decreased elevator operation efficiency.
Innovation Solution
A wireless power supply system is designed with a power transmission unit and a power reception unit, including multiple coils and devices, where the power transmission unit is placed along the hoistway and the power reception unit is on the car, utilizing a controller to manage power distribution, with a second power transmission coil longer than the first in the traveling direction to maintain power supply while the car is moving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power reception coil stops opposite the power transmission coil to perform contactless power supply, then power transmission reliability is improved, but elevator operation efficiency deteriorates due to prolonged stop time
Solution Approach 1:
The power transmission system is segmented into multiple independent power transmission coils arranged along the hoistway at different heights. The power reception unit can selectively couple with any of these segmented coils depending on the car's position, enabling continuous power transmission without requiring the car to stop.
Solution Approach 2:
The system transitions from a static power transmission setup (requiring the car to stop at a fixed position) to a dynamic setup where multiple power transmission coils are distributed along the hoistway. The controller dynamically selects which coil to activate based on the real-time position of the power reception unit, allowing power transmission during motion.
2Duration of action of moving object
If the power transmission coil length is increased to maintain coupling during movement, then power supply continuity is improved, but device complexity and space occupation increase
Solution Approach 1:
Instead of using one extremely long power transmission coil, the system segments the power transmission function into multiple smaller coils positioned at different heights along the hoistway. Each coil has a manageable length and is activated only when the car is in its corresponding position range, reducing overall system complexity while maintaining continuous power supply.
Solution Approach 2:
The system uses multiple power transmission coils that collectively cover the entire hoistway range. At any given moment, only the coil corresponding to the car's current position is activated (partial action), rather than requiring all coils to be active simultaneously or using one oversized coil.
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 configuration ensures a secure power supply time and prevents a decrease in elevator operation efficiency by allowing power transmission from the second power transmission coil even when the car is moving, optimizing power delivery and efficiency.
Implementation Method 1
a power transmission unit that supplies the power in a contactless manner; a power reception unit that receives the power in the contactless manner
Data Source
AI summary
A power transmission unit includes a plurality of power transmission coils provided along a hoistway and at least one power transmission device that supplies power to each of a plurality of power transmission coils. A power reception unit includes a plurality of power reception coils provided on a surface of a car opposite to the power transmission coil and at least one power reception device that receives the power from each of power reception coils. The plurality of power transmission coils include at least a first power transmission coil and a second power transmission coil. A length of the second power transmission coil in a traveling direction of the car is longer than a length of the first power transmission coil.