Open-portion Power Reception Coil for Wireless Charging Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The efficiency of wireless power transfer in autonomous running working machines, such as lawn mowers, declines if the power reception coil is not properly aligned with the core during charging, leading to suboptimal energy transfer.
Innovation Solution
The power reception coil is designed with an open portion that allows the core to pass through, with a front end positioned higher than the core's leading end and a low-position portion below, enabling easy alignment and efficient energy transfer, and a power transmission cover with a convex projecting portion that engages with a recessed portion on the machine, ensuring correct positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the power reception coil is arranged at an inappropriate position with respect to the core, then the alignment process becomes complex and difficult, but the energy transfer efficiency of wireless power feeding declines
Solution Approach 1:
The power reception coil is designed with an open portion that allows the core to pass through during entry, enabling the coil to automatically align itself with the core without requiring complex external alignment mechanisms or manual adjustment. The coil's own structure facilitates its proper positioning.
Solution Approach 2:
The open portion is provided in advance in the power reception coil structure, allowing the core to pass through before the coil needs to be fully positioned. This preliminary opening facilitates the alignment process by allowing the core to guide the coil into its correct position during the entry motion.
2Ease of operation
If the power reception coil is designed with an open portion for core passage, then alignment with the core becomes easier, but the coil structure becomes more complex
Solution Approach 1:
The power reception coil is segmented into multiple turns with an open portion, allowing the core to pass through the coil structure. This segmentation enables the coil to maintain its functional winding structure while incorporating the necessary opening for alignment purposes.
3Ease of operation
If the front end portion of the power reception coil is positioned higher than the leading end of the core, then the core can pass through the open portion, but the coil requires precise positioning to maintain proper alignment
Solution Approach 1:
The power reception coil is designed with asymmetric positioning where the front end portion is arranged at a higher position than the leading end of the core, creating an inclined arrangement. This asymmetric design allows the core to pass through the open portion while the inclination naturally guides the coil into proper alignment during entry.
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 allows for easy and efficient alignment of the power reception coil with the core, enhancing energy transfer efficiency and preventing collisions during charging, thus improving the autonomy and reliability of the machine.
Implementation Method 1
an electromagnetically guided wireless power feeding system which feeds power in a non-contact manner
Implementation Method 2
inserting a core of a magnetic substance into a power transmission coil and a power reception coil in order to enhance the efficiency of energy transfer
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A power reception coil (35) can be easily arranged at an appropriate position with respect to a core (34). An autonomous running working machine (2) that receives power wirelessly fed from a station (3) includes a power reception coil (35) that is provided in the station and is magnetically coupled to a power transmission coil (33), in which a core (34) of a magnetic substance is inserted, and the power reception coil (35) includes an open portion (70) through which the core (34) passes when the autonomous running working machine (2) enters the station (3).