Magneto-Inductive Transmitter With Permeability Modulation
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Solution Overview
Problem
Conventional magneto-inductive communication systems for underwater and underground environments face inefficiencies due to bulky and power-hungry designs, particularly when using coiled loops or solenoids, and mechanical modulation methods result in low bandwidth.
Innovation Solution
A magneto-inductive transmit antenna design featuring a magnetic shield made of high permeability material and a rotating permanent magnet, where the magnetic field is modulated by changing the permeability of the shield through an inductive coil, allowing for efficient and high-bandwidth communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If coiled loops or solenoids are used to generate low frequency magnetic moment, then magnetic field generation is achieved, but the system becomes bulky and inefficient
Solution Approach 1:
The patent replaces conventional electrical coil systems with a rotating permanent magnet system. Instead of using electromagnetic induction through coiled loops or solenoids, the invention uses a permanently magnetized rotor that generates the magnetic field through its rotation, eliminating the need for bulky copper coils and achieving both compact size and high efficiency
Solution Approach 2:
The patent changes the fundamental operating parameter from electromagnetic induction (requiring large coils) to direct magnetic field rotation (using permanent magnets). This parameter change allows the system to achieve the same low-frequency magnetic moment generation with dramatically reduced volume and improved efficiency
2Productivity
If mechanical rotation speed change is used for modulation, then modulation is achieved, but power consumption increases and bandwidth decreases
Solution Approach 1:
The patent replaces mechanical modulation (changing rotation speed) with magnetic modulation (changing permeability of magnetic material). Instead of mechanically varying the rotation speed of the permanent magnet, the invention uses an electromagnet with variable permeability material to modulate the magnetic field, enabling high-bandwidth communication with low power consumption
Solution Approach 2:
The patent changes the modulation mechanism from mechanical parameter variation (rotation speed) to magnetic parameter variation (permeability). By using magnetic material with controllable permeability, the system achieves modulation without mechanical movement, thereby increasing bandwidth and reducing power consumption
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 enables compact, high-efficiency, and high-bandwidth communication systems capable of modulating magnetic fields at frequencies suitable for underwater and underground environments, surpassing conventional systems in terms of bandwidth and power consumption.
Implementation Method 1
a coil wrapped around the shield to define a number of turns. The coil is configured to conduct a current therethrough
Implementation Method 2
The magnetic material is configured to exhibit a change in permeability based on the current conducted through the coil when the current is conducted through the coil
Implementation Method 3
a permanent magnet mounted on a first side of the shield and to the motor shaft to rotate with the motor shaft
Data Source
AI summary
A magneto-inductive transmit antenna is provided that includes a shield formed of a magnetic material, a magnetic field source mounted on a first side of the shield, and a coil wrapped around the shield to define a number of turns. The coil is configured to conduct a current therethrough. The magnetic material is configured to exhibit a change in permeability based on the current conducted through the coil when the current is conducted through the coil. The change in permeability is configured to modulate a magnetic field of the magnetic field source. The magnetic field is modulated relative to a second side of the shield opposite the first side when the permeability is changed.