Rotating Diamagnetic Magnet Antenna for Low-Frequency Field Generation
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Solution Overview
Problem
Generating low-frequency electromagnetic fields, particularly below the Low Frequency (LF) band, is inefficient due to the need for large, power-intensive equipment, making it difficult to penetrate materials like seawater and rock for applications such as communication and resource detection.
Innovation Solution
A system using rotating permanent magnets with coils to generate time-varying magnetic fields, where the magnets are magnetized non-parallel to their axis of rotation, allowing for efficient production of low-frequency oscillating magnetic fields with reduced power consumption and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional large antennas are used to generate low-frequency electromagnetic fields, then the field generation capability is improved, but the device size and power consumption increase significantly
Solution Approach 1:
The patent replaces the traditional mechanical antenna system with a rotating magnet system. Instead of using large physical antennas to generate low-frequency electromagnetic fields, the invention uses a magnet rotating on an axis, where the rotation mechanically generates the time-varying magnetic field. This mechanical substitution allows for compact device size while maintaining field generation capability.
Solution Approach 2:
The patent changes the operating parameters by using a magnet with specific magnetic moment oriented at an angle to the rotation axis. By adjusting the magnetic moment orientation and rotation speed, the system generates low-frequency electromagnetic fields efficiently without requiring large antenna dimensions. The parameter change from static antenna to rotating magnetic dipole transforms the field generation mechanism.
2Reliability
If traditional large antennas are used to generate low-frequency electromagnetic fields, then the field penetration capability is improved, but the power consumption increases significantly
Solution Approach 1:
The rotating magnet system replaces power-intensive antenna systems with a mechanically rotated magnet. The mechanical rotation of a magnet with appropriate magnetic moment creates time-varying magnetic fields that penetrate seawater and rock effectively, consuming significantly less electrical power than traditional antenna systems.
Solution Approach 2:
The system uses periodic rotation of the magnet to generate time-varying electromagnetic fields. The continuous rotational motion creates oscillating magnetic fields at low frequencies that enhance penetration through conductive media like seawater and rock, maintaining reliable field generation with reduced power consumption compared to continuous high-power antenna operation.
3Volume of stationary object
If magnets are rotated to generate low-frequency magnetic fields, then the device size is reduced, but the complexity of controlling rotation and field generation increases
Solution Approach 1:
The rotating magnet system serves multiple functions simultaneously: it generates the time-varying magnetic field, defines the field orientation through its rotation, and can be controlled to vary field frequency by adjusting rotation speed. This multi-functionality reduces overall device complexity compared to systems requiring separate components for each function.
Solution Approach 2:
The system uses dynamic rotation of the magnet to generate electromagnetic fields, where the rotation speed and orientation can be adjusted to control field characteristics. This dynamic approach allows a single compact component to produce variable frequency and orientation fields, simplifying the overall device architecture compared to static multi-component systems.
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
Enables efficient generation of low-frequency magnetic fields with reduced power requirements and size, facilitating penetration through materials like seawater and rock for various applications, including communication and resource detection.
Implementation Method 1
a coil, where the coil is disposed proximate to the magnet such that an electrical current through the coil produces a magnetic field that causes the magnet to rotate about the axis of rotation
Implementation Method 2
a diamagnetic material (e.g., pyrolytic graphite) disposed proximate to the magnet and configured to levitate the magnet
Implementation Method 3
a bias magnet disposed proximate to the radially magnetized portion of the magnet such that the bias magnet levitates the magnet
Implementation Method 4
a ferromagnetic material that is disposed proximate to the magnet such that rotation of the magnet induces a time-varying magnetization in the ferromagnetic material
Data Source
AI summary
Systems are provided for the efficient generation of oscillating magnetic fields below the Low Frequency band. These systems generate such fields by mechanically rotating one or more diametrically-magnetized permanent magnets. In order to reduce friction, the magnets are rotated by applying a motive magnetic field to the magnet(s) to rotate the magnet(s) and thereby generate the oscillating magnetic field. Additionally, diamagnetic repulsion, active magnetic field control, and/or biasing permanent magnets are employed to levitate the rotating magnet(s), further reducing friction and increasing system efficiency. These systems may be employed to generate modulated low-frequency oscillating magnetic fields for communication through seawater, rocks, or other obstacles. Additionally or alternatively, these systems may be employed to generate low-frequency oscillating magnetic fields for navigation and location sensing, resource identification and extraction, or other applications.