Micro-Nano Magnetic Generator for Stable Vibration Energy Harvesting
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Solution Overview
Problem
Existing magnetic power generation devices are difficult to miniaturize and unstable, limiting their application to small devices, and self-powered systems fail to provide stable power supply.
Innovation Solution
A micro-nano vibration magnetic generator with a power generation unit and magnetic supply unit, utilizing a magnetic core, power generation coil, and magnetic gap to convert mechanical motion into electrical energy, featuring a magnetic supply unit that provides a changing external magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If magnetic power generation is realized by rotation of magnet and coil rotor, then power generation can be achieved, but device complexity and size increase making miniaturization difficult
Solution Approach 1:
The device is segmented into distinct functional units: a magnetic supply unit with N-pole and S-pole regions, a separate power generation unit with magnetic core and coil, and a vibration transmission structure. This segmentation allows each component to be optimized independently and facilitates miniaturization while maintaining power generation capability.
Solution Approach 2:
Instead of rotating the magnet and coil rotor together as in conventional designs, this invention keeps the magnetic supply unit stationary or differently positioned relative to the power generation unit, using vibration-induced relative motion rather than rotational motion. This inversion of the conventional approach enables significant structural simplification and miniaturization.
2Volume of moving object
If magnetic power generation device is miniaturized, then it can be applied to small devices, but power generation stability decreases
Solution Approach 1:
The invention uses dynamic vibration-induced relative motion between the magnetic supply unit and power generation unit instead of static or simple rotational motion. The vibration can be in multiple directions and the magnetic poles can be arranged in various patterns, creating dynamic changes in magnetic flux that enhance power generation stability even at micro-nano scale.
Solution Approach 2:
The invention optimizes critical parameters including the distance between magnetic gap and sloshing substrate (less than 10 microns), the size and arrangement of magnetic poles (10 nm to 50 μm spacing), and the vibration frequency. These parameter optimizations ensure stable power generation output while maintaining miniaturized dimensions.
3Volume of moving object
If piezoelectric method is used for power generation, then device size can be reduced, but current generation per unit volume becomes limited
Solution Approach 1:
The invention uses composite magnetic structures including magnetic layers made of cobalt, cobalt alloy, or barium ferrite with specific pole arrangements, combined with high-permeability magnetic core materials. This composite magnetic approach generates stronger magnetic flux changes per unit volume compared to piezoelectric methods, overcoming the power density limitation while maintaining miniaturization.
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 generator can sense micro-nano vibrations, has a very small volume, and can be assembled on small devices, stabilizing output current.
Implementation Method 1
the power generation coil, which is used to generate current and output when the magnetic field formed by the magnetic line inside the magnetic core changes
Implementation Method 2
the magnetic supply unit, which moves relative to the power generation unit, provides a changing external magnetic field at the magnetic gap
Data Source
AI summary
A micro-nano vibration magnetic generator is provided. The micro-nano vibration magnetic generator includes a power generation unit and a magnetic supply unit, wherein the power generation unit includes a magnetic core, a power generation coil wound on the magnetic core and a magnetic gap set on the magnetic core, wherein the magnetic gap is used to introduce the magnetic field line of the induction magnetic supply unit into the magnetic core; the magnetic core is used to conduct the introduced magnetic field line and form a magnetic field line loop with the external magnetic field; the power generation coil is used to generate current and output when the magnetic field formed by the magnetic line inside the magnetic core changes; the magnetic supply unit, which moves relative to the power generation unit, provides a changing external magnetic field at the magnetic gap.