Orthogonal Transmitter Coils for 3D Wireless Power Transfer
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Solution Overview
Problem
Existing wireless power transfer systems are unable to efficiently transfer power to a receiver coil that changes its three-dimensional posture, as they are typically limited to two-dimensional planes, leading to inefficiencies and the need for costly monitoring and control systems to maintain power supply.
Innovation Solution
A wireless power transfer system utilizing three transmitter coils with orthogonal normal vectors, where the synthetic magnetic field vector rotates in a three-dimensional space, allowing for constant power transfer regardless of the receiver coil's posture through controlled amplitude and phase regulation of the magnetic field components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a two-dimensional rotating magnetic field is used, then the transfer efficiency is insensitive to the angle of the receiver coil in that plane, but the permissible directions are limited within a two-dimensional plane and three-dimensional dynamic posture cannot be dealt with
Solution Approach 1:
The patent extends the rotating magnetic field from a two-dimensional plane to three-dimensional space by introducing a third orthogonal transmitter coil. This creates a spherical rotating magnetic field that can accommodate receiver coils in any three-dimensional orientation, resolving the limitation of two-dimensional systems while maintaining simplicity through symmetric coil arrangement
2Adaptability or versatility
If three transmitter coils with orthogonal normal vectors are used to create three-dimensional rotating magnetic field, then power transfer becomes insensitive to three-dimensional posture, but the system complexity increases
Solution Approach 1:
The patent employs symmetric arrangement of three transmitter coils with orthogonal normal vectors, creating a balanced three-dimensional rotating magnetic field system. This symmetric configuration achieves omnidirectional power transfer capability while maintaining system simplicity through regular geometric relationships between coils
Solution Approach 2:
Each of the three orthogonal transmitter coils serves multiple functions: generating magnetic field components in specific directions, contributing to the rotating magnetic field pattern, and enabling power transfer to receivers in various orientations. This multi-functionality reduces the need for additional specialized components
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
Enables stable and efficient wireless power transfer to a receiver coil regardless of its three-dimensional orientation, simplifying the system and reducing costs by eliminating the need for real-time posture monitoring and control, while maintaining a constant power level.
Implementation Method 1
electromagnetic induction or coupling is typically used by providing coils in a power transmitter and a power receiver
Implementation Method 2
power transfer technique making use of magnetic resonance is highly expected to wirelessly supply electric power to multiple power receivers
Data Source
AI summary
A wireless power transfer system includes a first transmitter coil, a second transmitter coil and a third transmitter coil arranged such that normal directions to planes of the first, the second and the third transmitter coils are orthogonal to each other in a three-dimensional space, and a controller that controls electric currents supplied to the first, the second and the third transmitter coils such that a synthetic magnetic field vector produced by the first, the second and the third transmitter coils rotates in a plane of rotation at a first angular frequency “ω”, and that a normal vector to the plane of rotation rotates about an axis of rotation perpendicular to the normal vector at a second angular frequency “a” equal to or smaller than the first angular frequency (a≤ω).