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An apparatus for generating power responsive to mechanical vibration

A vibration energy harvesting and generator technology, applied in electromechanical devices, generators/motors, piezoelectric effect/electrostrictive or magnetostrictive motors, etc., can solve problems such as power output capacity limitations

Inactive Publication Date: 2012-04-11
LUMEDYNE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These devices are therefore limited in terms of power output capability by the limited mass of a single magnet, the limited space for multiple coils in the flux field of a single magnet, and the limited flux slope available at the coils due to the single pole exposed therein limits

Method used

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  • An apparatus for generating power responsive to mechanical vibration
  • An apparatus for generating power responsive to mechanical vibration
  • An apparatus for generating power responsive to mechanical vibration

Examples

Experimental program
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Embodiment Construction

[0033] figure 1 is a schematic diagram showing a damped mass-spring model representative of the micro-generator system of the present invention. Both electrical and mechanical damping must be considered in the analysis and design optimization for a specific ambient vibration spectrum. refer to figure 1 , for time t, mass m, spring constant k, electrical damping factor b e , mechanical damping factor b m and displacement function z(t), the available power P from the coil current can be expressed as shown in Equation 1:

[0034] P = ∫ 0 v Fdv = ∫ 0 v b e z · dv = b e ∫ 0 v vdv = 1 2 b e ...

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Abstract

A vibrational energy harvesting apparatus comprising: a substrate having a plurality of integral compliant regions; at least two ferromagnetic masses each coupled to a corresponding one or more of the integral compliant regions such that at least one of the ferromagnetic masses moves with respect to the substrate responsive to substrate acceleration, each ferromagnetic mass having an inner magnetic pole disposed such that the inner magnetic poles are separated by a flux gap, wherein the magnetic polarities of the inner magnetic poles on the opposing sides of the flux gap are similar; wherein the inner magnetic poles form a steep flux gradient region in the flux gap; and a coil coupled to the substrate and disposed within the steep flux gradient region where it is exposed to a changing magnetic flux arising from motion of at least one of the ferromagnetic masses with respect to the substrate.

Description

[0001] Statement of Government Interest [0002] The invention described herein may be made and used by or for the United States Government for Government purposes without payment of any royalties for the invention. [0003] Federally funded research and development [0004] This application is assigned to the United States Government and is licensed for commercial use. No authorization is required when used for government purposes. Licensing and technical review should be performed by the Office of Patent Counsel, Space and Naval Warfare Systems Center, San Diego, CA 92152, 20012; (619) 553-3001 , fax (619) 553-3821. See Navy Case #99735. Background technique [0005] There is growing interest in the field of practical applications such as miniaturized sensors in medical implants and embedded sensors in buildings. One of the projected goals of microelectromechanical systems (MEMS) technology is the development of low-cost and high-performance distributed sensor systems f...

Claims

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Application Information

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IPC IPC(8): H02K33/00
CPCH02K35/02H02N2/18
Inventor P·沙利文R·沃特斯B·R·亨特
Owner LUMEDYNE TECH