Current Transformer Core Layout for Higher Permeability
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Solution Overview
Problem
Conventional current transformer cores experience reduced permeability and inductance due to stress regions on the magnetic path and reduced coil turns, leading to decreased power acquisition efficiency.
Innovation Solution
A core design with an upper core in a semi-circular shape and a lower core with extended portions, forming a receiving groove to minimize stress on the magnetic path, increase permeability, and enhance inductance by allowing more turns of the coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the upper core and lower core are formed with bent portions having an angle of about 90 degrees, then the core structure is compact and easier to manufacture, but stress region on magnetic path is generated, reducing permeability
Solution Approach 1:
The upper core is designed with a curved surface instead of sharp bent portions, eliminating stress concentration points on the magnetic path while maintaining the compact structure. This curvature design allows the core to achieve both ease of manufacture and high magnetic permeability by avoiding the 90-degree angle problem.
2Device complexity
If the coil is wound directly around one of the upper core and lower core in a semi-cylindrical shape, then the core structure is simplified, but the number of turns of the coil reduces, thereby reducing the inductance
Solution Approach 1:
The core structure extends in the vertical dimension with the upper core positioned above the lower core, creating a three-dimensional magnetic path. This allows the coil to be wound around the upper core with sufficient space for adequate turns, maintaining high inductance while keeping the core structure simple.
3Length of stationary object
If the upper core is positioned at or above the center of the power line, then the magnetic path length is maximized, but stress on the magnetic path increases, reducing magnetic induction efficiency
Solution Approach 1:
The upper core is deliberately positioned asymmetrically below the center of the power line rather than at the center or above it. This asymmetric positioning optimizes the balance between magnetic path length and stress reduction, achieving high magnetic induction efficiency by placing the upper core at an optimal offset position.
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 design increases permeability and inductance, improving power acquisition efficiency and allowing for a larger mountable bobbin and more turns, thus enhancing the overall performance of the current transformer.
Implementation Method 1
The magnetic induction type power supply device converts the power obtained by the magnetic induction phenomenon in the current transformer into DC to supply it to the load
Data Source
AI summary
Disclosed is a core for a current transformer, which forms an upper core in a round shape, and is disposed at a position lower than the center of a power line having both ends of the upper core received, thereby minimizing the stress of a magnetic path, and increases the permeability, thereby enhancing the magnetic induction efficiency. The disclosed core for the current transformer includes an upper core curved in a semi-circular shape to have a receiving groove formed therein, and having both ends extended downwards to be disposed to be spaced apart from each other and a lower core disposed on the lower portion of the upper core, and having both ends extended upwards to be disposed to face both ends of the upper core.