Electromechanical energy harvesting system
First Claim
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1. A method of electromechanical energy harvesting comprising:
- detecting electrical current generated by relative movement of a coil and a magnetic flux source produced by movement of a cantilevered beam in response to ambient vibration energy;
determining a vibration characteristic of the ambient vibration energy; and
adjusting an effective flexible length of the cantilevered beam as a function of the vibration characteristic and the detected electrical current,wherein the effective flexible length of the cantilevered beam is adjusted such that ambient vibration energy causes the cantilevered beam to vibrate at approximately a resonant frequency.
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Abstract
A method of electromechanical energy harvesting includes sensing electrical current generated by relative movement of a coil and a magnetic flux source produced by movement of a cantilevered beam in response to ambient vibration energy, determining a vibration characteristic of the ambient vibration energy, and adjusting an effective flexible length of the cantilevered beam as a function of the vibration characteristic and the sensed electrical current.
50 Citations
17 Claims
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1. A method of electromechanical energy harvesting comprising:
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detecting electrical current generated by relative movement of a coil and a magnetic flux source produced by movement of a cantilevered beam in response to ambient vibration energy; determining a vibration characteristic of the ambient vibration energy; and adjusting an effective flexible length of the cantilevered beam as a function of the vibration characteristic and the detected electrical current, wherein the effective flexible length of the cantilevered beam is adjusted such that ambient vibration energy causes the cantilevered beam to vibrate at approximately a resonant frequency. - View Dependent Claims (2, 3)
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4. An electromechanical energy harvesting system comprising:
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a cantilevered beam; a coil; a magnetic flux source, wherein the coil and the magnetic flux source are configured to generate electrical current by relative movement therebetween in response to ambient vibration energy that produces vibration of the cantilevered beam; a processor configured to determine a vibration characteristic of the ambient vibration energy; and a mechanism to adjust an effective flexible length of the cantilevered beam as a function of the vibration characteristic and the electrical current, wherein the processor provides a frequency estimator and wherein the vibration characteristic is an estimated vibration frequency of the cantilevered beam. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. An electromechanical energy harvesting system comprising:
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a cantilevered beam; a coil; a magnetic flux source, wherein the coil and the magnetic flux source are configured to generate electrical current by relative movement therebetween in response to ambient vibration energy that produces vibration of the cantilevered beam; a processor configured to determine a vibration characteristic of the ambient vibration energy as a function of the electrical current; an accelerometer mounted to the cantilevered beam for detecting frequencies of the ambient vibration energy that produces vibration of the cantilevered beam; and a mechanism to adjust an effective flexible length of the cantilevered beam as a function of the electrical current. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification