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1 April 2014 Characterization of a rotary hybrid multimodal energy harvester
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In this study, experimental characterizations of a new hybrid energy harvesting device consisting of piezoelectric and electromagnetic transducers are presented. The generator, to be worn on the legs or arms of a person, harnesses linear motion and impact forces from human motion to generate electrical energy. The device consists of an unbalanced rotor made of three piezoelectric beams which have permanent magnets attached to the ends. Impact forces cause the beams to vibrate, generating a voltage across their electrodes and linear motion causes the rotor to spin. As the rotor spins, the magnets pass over ten electromagnetic coils mounted to the base, inducing a current through the wire. Several design related issues were investigated experimentally in order to optimize the hybrid device for maximum power generation. Further experiments were conducted on the system to characterize the energy harvesting capabilities of the device, all of which are presented in this study.
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Miles R. Larkin and Yonas Tadesse "Characterization of a rotary hybrid multimodal energy harvester", Proc. SPIE 9057, Active and Passive Smart Structures and Integrated Systems 2014, 90570U (1 April 2014);

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