Primary Coil Adjustment in Inductive Charging for Parking Offset
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Solution Overview
Problem
Existing inductive charging systems for electric vehicles face inefficiencies due to lateral offsets in the x- and y-directions during parking, leading to reduced coupling factors and increased electromagnetic losses, as the entire primary coil unit must be moved to correct offsets, which is cumbersome and inefficient.
Innovation Solution
The primary coil unit is designed to be movable relative to the primary ferrite, allowing displacement and adjustment of the magnetically active surface area through foldable ferrite elements, which can be controlled to optimize magnetic flux and minimize stray fields, enabling efficient coupling even with inaccurately parked vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire primary coil unit is moved to correct lateral offsets during parking, then optimal magnetic coupling is achieved, but the system complexity and operational difficulty increase significantly
Solution Approach 1:
The primary coil unit is divided into a stationary primary ferrite component and a movable primary coil component. This segmentation allows only the coil to be adjusted for offset compensation while the ferrite remains fixed, reducing the complexity of moving the entire assembly and enabling more precise positioning of the magnetic coupling elements.
Solution Approach 2:
The primary coil is designed with movable support relative to the primary ferrite, enabling dynamic adjustment of the coil position to correct lateral offsets. This dynamic capability allows the system to adapt to parking position variations without requiring the entire primary coil unit to be moved, thereby maintaining coupling efficiency while simplifying the adjustment mechanism.
2Device complexity
If the primary coil is rigidly connected to the primary ferrite, then the structure is simpler, but the ability to correct lateral offsets and maintain optimal coupling is reduced
Solution Approach 1:
The primary coil is designed with movable support relative to the primary ferrite, enabling dynamic adjustment of the coil position to correct lateral offsets. This dynamic capability allows the system to adapt to parking position variations without requiring the entire primary coil unit to be moved, thereby maintaining coupling efficiency while simplifying the adjustment mechanism.
3Loss of energy
If ferrite elements are made foldable to adjust magnetically active surface area, then electromagnetic losses are reduced, but the manufacturing complexity increases
Solution Approach 1:
The primary ferrite is divided into multiple foldable ferrite elements that can be independently adjusted. This segmentation allows the magnetically active surface area to be optimized by folding out only the necessary elements, reducing electromagnetic losses while keeping the manufacturing of individual elements simpler and more modular.
Solution Approach 2:
The ferrite elements are designed to be foldable rather than fixed, allowing the magnetically active surface area to be dynamically adjusted based on the parking position and coupling requirements. This dynamic adjustment enables optimization of electromagnetic performance while maintaining manageable manufacturing complexity through modular design.
4Ease of manufacture
If the primary coil position is fixed relative to the primary ferrite, then the device is easier to manufacture, but the system cannot tolerate inaccurate parking positions
Solution Approach 1:
The primary coil unit is segmented into a stationary primary ferrite and a movable primary coil. This segmentation allows the coil to be independently positioned to compensate for parking offsets while the ferrite remains fixed, thereby maintaining manufacturing simplicity while significantly improving parking position tolerance.
Solution Approach 2:
The primary coil is designed with movable support relative to the primary ferrite, enabling dynamic adjustment of the coil position to correct lateral offsets. This dynamic capability allows the system to adapt to parking position variations without requiring the entire primary coil unit to be moved, thereby maintaining coupling efficiency while simplifying the adjustment mechanism.
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 solution allows for improved electromagnetic coupling efficiency by adjusting the primary coil's position and magnetically active surface area, reducing electromagnetic losses and enabling more tolerant parking positions without the need to move the entire primary coil unit, thus enhancing energy transmission and reducing complexity.
Implementation Method 1
the vehicle incorporates a secondary charging unit, which interacts with an off-board primary charging unit by means of magnetic coupling
Implementation Method 2
the primary coil unit comprises a primary coil and a primary ferrite
Data Source
AI summary
A method for the supply of an electrical component with electric power using an inductive charging system having a primary coil unit and a secondary coil unit, where the electrical component is connected on a secondary side corresponding to the secondary coil, includes setting a rough position of the secondary coil unit relative to the primary coil unit to establish an electromagnetic coupling, displacing a primary coil in the primary coil unit relative to a primary ferrite in the primary coil unit in a preferred direction such that an electromagnetic coupling factor of the rough position of the secondary coil unit relative to the primary coil unit is increased, where the preferred direction lies in a plane of a planar basic shape of the primary ferrite, and changing a magnetically active surface area within the primary coil unit in the plane.