Basketweave Long-Range Coil Assembly for Low-Impedance Field Generation
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Solution Overview
Problem
Current magnetic field generators used in safety systems for underground mines have limited range due to packaging constraints, and increasing the number of coil turns to enhance the magnetic field strength is hindered by increased impedance, which reduces current flow.
Innovation Solution
A coil and power source assembly featuring a unique basketweave winding pattern and a source impedance control network with resistors and amorphous noise suppression devices, allowing for more turns without significantly increasing impedance, and a high-power H-bridge switching system to manage the increased power requirements for a larger magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the number of coil turns is increased to enhance magnetic field strength, then the magnetic field strength is improved, but the impedance increases which reduces current flow
Solution Approach 1:
The patent applies parameter changes by modifying the winding configuration from conventional helical turns to a specific pattern with optimized turn density and distribution. This changes the electrical parameters (impedance) while maintaining or enhancing the magnetic field generation capability, resolving the contradiction between field strength and impedance
Solution Approach 2:
The patent uses composite construction by combining multiple winding sections with different characteristics. The coil assembly incorporates various wire gauges and winding densities in different sections, creating a composite structure that optimizes both magnetic field production and impedance management
2Strength
If the core dimensions are increased to produce a larger magnetic field, then the magnetic field strength is improved, but the device size exceeds packaging constraints
Solution Approach 1:
The patent changes the magnetic properties by using high-permeability ferrite materials and optimizing the core geometry (ring shape with specific cross-section dimensions). This allows achieving high magnetic field strength with a compact core volume that fits packaging constraints
Solution Approach 2:
The patent employs composite material construction by combining ferrite core material with copper windings and insulating materials. This composite approach maximizes magnetic field generation efficiency within the constrained volume, allowing high field strength without increasing core dimensions
3Strength
If more turns are added to the coil, then the magnetic field strength is improved, but the available current is reduced due to increased impedance
Solution Approach 1:
The patent optimizes the electrical parameters by selecting specific wire gauges (AWG 14, 16, 18) for different winding sections and adjusting turn counts (50-100 turns per section). This parameter optimization balances the number of turns with acceptable impedance levels, maintaining sufficient current flow while generating enhanced magnetic fields
Solution Approach 2:
The patent divides the coil into multiple independent winding sections (first through fourth sections) with different characteristics. Each section can be optimized independently for its specific function, allowing the overall system to achieve high magnetic field strength while managing total impedance through the segmented structure
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 solution achieves a magnetic field strength increase of up to 14X, extending the detection range to over 200 feet while maintaining a compact size, by reducing impedance and optimizing power source switching control.
Implementation Method 1
The two ends of the conductive wire are electrically coupled to an output of the driver circuit for receiving the current to create a magnetic field
Implementation Method 2
The driver circuit includes a source impedance control which includes a plurality of pairs of resistors and amorphous noise suppression devices in a unique component network
Data Source
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AI summary
An improved long range coil and driver assembly for a magnetic field generator wherein the driver and coil generate a large magnetic field is provided. The coil and driver assembly includes a source impedance control network which includes a plurality of pairs of resistors and amorphous noise suppression devices, and a coil that utilizes a unique basket weave winding pattern to reduce the effect of the back EMF from one wire on the adjoining wires, thereby reducing the impedance of the coil. The reduced impedance and improved impedance control increases the current that can flow creating a larger field.