Multiphase Inductive Charging with Standing-Wave Coil Alignment
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Solution Overview
Problem
Inductive energy transfer systems face challenges in maintaining efficient energy transfer due to sensitivity to coil positioning, requiring additional sensors for alignment, which increase costs and vulnerability, and multiphase systems suffer from local losses and magnetic limit violations.
Innovation Solution
Generate a movable and field-orientable standing wave using a multi-phase transmitter winding, adapting it to the relative position of the receiver winding to maintain a constant coupling factor, reducing sensitivity to positional changes and eliminating the need for additional alignment sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-phase inductive charging systems are used with stationary magnetic field, then system simplicity is maintained, but transmission efficiency becomes highly dependent on precise coil positioning requiring assistance systems
Solution Approach 1:
The patent changes the fundamental parameter of magnetic field generation from single-phase stationary field to multi-phase standing wave field. This parameter change transforms the field characteristics to create nodes with zero magnetic flux density, enabling tolerance to coil positioning deviations while maintaining transmission efficiency without requiring assistance systems
Solution Approach 2:
The patent introduces dynamic multi-phase control to generate standing waves that can adapt to coil positioning variations. The multi-phase system dynamically adjusts the magnetic field distribution to maintain effective energy transfer despite lateral displacements, making the system robust without additional sensors
2Measurement precision
If assistance systems or additional sensors are added to support coil alignment, then positioning accuracy is improved, but costs and system vulnerability increase
Solution Approach 1:
The patent makes the system self-aligning through the inherent properties of standing waves. The nodes of the standing wave automatically provide optimal coupling points, and the system self-adjusts to maintain efficiency without external assistance systems or sensors, reducing complexity and vulnerability
Solution Approach 2:
By changing to multi-phase standing wave operation, the system fundamentally alters the magnetic field distribution pattern to create regions of zero flux density. This parameter change eliminates the need for precise alignment measurements, making assistance systems and sensors unnecessary
3Reliability
If traveling waves are used in multiphase inductive transmission, then positioning tolerance is improved, but high local losses and magnetic limit violations occur
Solution Approach 1:
Instead of using traveling waves that continuously move energy across the entire coil area (causing edge losses), the patent inverts the approach by using standing waves with stationary nodes. These nodes create localized regions of concentrated magnetic flux that eliminate the traveling wave effect and its associated edge losses while maintaining positioning tolerance
Solution Approach 2:
The standing wave pattern creates localized regions of high magnetic flux density at the nodes, concentrating the energy transfer in specific areas rather than distributing it uniformly. This local quality enhancement allows efficient energy transfer with reduced lateral displacement sensitivity while avoiding the high local losses associated with traveling waves
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
Enhances lateral positioning tolerance, optimizes energy transfer efficiency, and eliminates the need for costly alignment sensors, making the system more user-friendly and efficient for mobile charging applications.
Implementation Method 1
inductive transmission of electrical energy... Generating a standing wave, in particular a movable and/or field-orientable or field-oriented, of a magnetic field used for inductive energy transmission
Data Source
Figure 1a~1b
Figure 2a~2d
Figure 3
AI summary
The invention relates to a method for the inductive transmission of electrical energy from a transmitter unit (10) to a receiver unit (20) of an inductive energy transmission system (100), comprising: - generating a standing wave of a magnetic field used for the inductive energy transmission by means of a multi-phase transmitter winding of the transmitter unit (10), wherein the standing wave is adapted to a relative position of the transmitter winding and a receiver winding of the receiver unit (20). Furthermore, the invention relates to a transmitter system for the inductive transmission of electrical energy, an inductive energy transmission system (100; 200), and a method for producing an inductive energy transmission system (100; 200).