DEVELOPMENT OF A PROTOTYPE MAGNETOSTRICTIVE ENERGY HARVESTING DEVICE

To enhance performance and safety, structures of all types are made “smart” with the addition of sensors. These sensors require power, but in some cases conventional power supply methods are inadequate. Ideally, these sensors would convert the available ambient energy into electrical energy. This thesis develops and examines a prototype energy harvesting transducer which converts mechanical vibration into electrical energy. The transducer utilizes the coupling between the magnetic and elastic state of magnetostrictive materials along with a flux-linked coil for conversion of mechanical energy to electrical energy. The examined transducer doesn’t affect the stiffness characteristics of the host structure, but as a result its performance is dependant on a resonance condition…

Contents

1. INTRODUCTION
1.1 Objective
1.2 Review of Energy Harvesting Principles
1.2.1 Introduction
1.2.2 Electric Generators (Wind/Hydro/Geothermal Power)
1.2.3 Solar Power
1.2.4 Piezoelectric Power
1.2.5 Magnetostrictive Power
1.3 Review of Magnetostrictives Materials and Magnetostrictive Transduction
1.3.1 Material Background
1.3.2 Basics of Magnetostrictives
1.3.2.1 Relationship between magnetic flux density and magnetic field
1.3.3 Peformance considerations
2. TRANSDUCER DESIGN AND TESTING METHODOLOGY
2.1 Transducer Design
2.1.1 Overview
2.1.2 Magnetic Circuit Design
2.1.3 Prestress Adjustment Design
2.1.4 Resonance Prediction and Tuning
2.1.5 Bias Coil and Sense Coil Design
2.2 Test Procedure
3. EXPERIMENTAL RESULTS
3.1 Static Strain-H Curves
3.2 Sine sweep tests to characterize transducer performance
3.3 Sinusoidal dwell tests
3.4 Sine sweep tests at 2 ksi and different biases
3.5 Sine Sweep Tests at different prestresses and optimum bias
3.6 Scalability of electrical output to mechanical input
3.7 Circuit Tests
3.8 Coil Inductance
4. FULL CIRCUIT MODELING
4.1 Circuit Model
4.2 Transducer Efficiency
5. CONCLUSION
5.1 Summary of Results
5.2 Recommended Future Work
APPENDIX A
APPENDIX B
APPENDIX C
APPENDIX D
APPENDIX E
References

Author: Staley, Mark Elliott

Source: University of Maryland

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