Rotary Wireless Power Transfer Core Segmentation for Durability
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Solution Overview
Problem
The existing power transmission devices have limitations in structural strength of magnetic cores, which affects their durability and manufacturing ease.
Innovation Solution
A power transmission device with annular transmission and reception units, each having magnetic cores divided into split cores in the circumferential direction, enhancing structural strength and manufacturing simplicity by allowing relative rotation and improved thermal stress management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If magnetic cores are made as integral annular structures, then manufacturing is simpler, but structural strength is insufficient
Solution Approach 1:
The magnetic core is divided into multiple segmented cores arranged circumferentially around the rotation axis. Each segmented core is a separate component that can be manufactured independently with better structural integrity, then assembled together to form the complete annular magnetic core structure.
2Strength
If magnetic cores are divided into segmented cores, then structural strength is improved, but device complexity increases
Solution Approach 1:
Multiple segmented cores are combined circumferentially to form a complete annular magnetic core structure. The segmented cores are positioned adjacent to each other around the rotation axis, merging their individual magnetic fields to create the functional equivalent of a solid annular core while maintaining the structural advantages of segmentation.
3Ease of operation
If transmission unit and reception unit are fixed relative to each other, then alignment is simpler, but rotational functionality is lost
Solution Approach 1:
The transmission unit and reception unit are configured to allow relative rotation about the rotation axis. This dynamic configuration enables the reception unit to rotate relative to the transmission unit while maintaining magnetic coupling through the segmented cores, providing rotational functionality without requiring complex realignment mechanisms.
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 provides sufficient structural strength and durability to the magnetic cores, improving power transmission efficiency and stability, especially when integrated with resin holder members that restrict positional displacements of split cores.
Implementation Method 1
a transmission coil (61) and a reception coil (62), wherein the winding portions (65) of the reception coil (62) are wound around the inner peripheral wall portions (35)
Data Source
AI summary
A power transmission device includes an annular transmission unit having an annular first magnetic core and a transmission coil and an annular reception unit having an annular second magnetic core and a reception coil. The transmission unit and the reception unit are arranged to face each other. The power transmission device transmits power from the transmission unit to the reception unit. The transmission unit and the reception unit are relatively rotatable about a rotation axis passing through a cavity inside the transmission unit and a cavity inside the reception unit, the first magnetic core has a structure divided into a plurality of first split cores in a circumferential direction, and the second magnetic core has a structure divided into a plurality of second split cores in the circumferential direction.