Three-Phase Winding Layout for Compact Inductive Vehicle Charging
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Solution Overview
Problem
Existing inductive power transfer systems for electric vehicles require significant installation space due to the spatial separation of primary and secondary winding structures, which limits their efficiency and versatility.
Innovation Solution
A primary-sided arrangement of winding structures with a three-phase topology, where the third winding structure is set back along the longitudinal axis, reducing installation space requirements by optimizing the pitch between subwinding structures and adjusting the phase shift between operating currents to maximize magnetic coupling while minimizing stray fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the primary and secondary winding structures are spatially separated to ensure proper magnetic coupling, then the inductive power transfer efficiency is improved, but the installation space requirement increases
Solution Approach 1:
The third winding structure is set back along the longitudinal axis and positioned within the spatial envelope created by the first and second winding structures. This nested arrangement allows all three phase windings to occupy a compact volume while maintaining the necessary pitch distances for efficient magnetic coupling, thereby reducing the overall installation footprint without sacrificing power transfer efficiency
Solution Approach 2:
Instead of arranging all winding structures in a single plane, the invention utilizes the longitudinal axis dimension by setting back the third winding structure. This three-dimensional arrangement optimizes the pitch between corresponding subwinding structures while minimizing the lateral installation space required for the complete primary-sided arrangement
2Area of stationary object
If the pitch between subwinding structures is reduced to minimize installation space, then the installation space requirement is decreased, but the magnetic coupling strength is weakened
Solution Approach 1:
The invention applies different pitch values to different phase windings locally. The pitch between the first and second winding structures differs from the pitch between the first and third winding structures, allowing each phase to be optimized for its specific spatial relationship. This local optimization maintains strong magnetic coupling while accommodating the compact overall arrangement
Solution Approach 2:
The invention optimizes the pitch parameter between corresponding subwinding structures to achieve the best compromise between compact size and coupling strength. By carefully selecting the pitch distance, the system maximizes magnetic coupling efficiency within the constrained installation space, and further adjusts phase shift parameters to enhance power transfer performance
3Area of stationary object
If the third winding structure is set back along the longitudinal axis to reduce installation space, then the installation space is minimized, but the phase balance and magnetic field uniformity may be affected
Solution Approach 1:
The invention intentionally introduces asymmetry by setting back the third winding structure along the longitudinal axis, creating different pitch relationships between phases. This asymmetric arrangement is compensated by adjusting the phase shift between operating currents, allowing the system to achieve balanced power transfer performance despite the unequal spatial distribution of windings
Solution Approach 2:
The system dynamically adjusts the phase shift between operating currents to compensate for the asymmetric spatial arrangement of winding structures. By making the electrical phase relationships adaptive, the system maintains balanced three-phase power transfer despite the fixed asymmetric mechanical layout, ensuring stable and efficient inductive power transfer
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 minimizes installation space requirements, enhances magnetic coupling between the primary and secondary winding structures, and allows for adaptable power transfer performance even in misaligned scenarios, improving the overall efficiency and flexibility of inductive power transfer systems.
Implementation Method 1
a circuit arrangement, which can be a traction system or a part of a traction system of the vehicle, comprising a receiving device adapted to receive an alternating electromagnetic field and to produce an alternating electric current by electromagnetic induction
Implementation Method 2
a receiving device adapted to receive an alternating electromagnetic field and to produce an alternating electric current by electromagnetic induction
Data Source
AI summary
A primary-sided arrangement including at least three phase lines and at least one winding structure per phase line, wherein each winding structure includes a subwinding structure, the winding structures extend along a longitudinal axis of the primary-sided arrangement, a first pitch between corresponding subwinding structures of a first and a second winding structure is chosen from an interval of a length of the subwinding structure and the first pitch is a distance between geometric centres of the corresponding subwinding structures of the first and the second winding structure along the longitudinal axis, and a second pitch between corresponding subwinding structures of the first winding structure and a third winding structure is smaller than the first pitch and the second pitch is a distance between geometric centres of the corresponding subwinding structures of the first and the third winding structure along the longitudinal axis.