HM-EH-RT: hybrid multimodal energy harvesting from rotational and translational motions

Larkin, Miles; Tadesse, Yonas

doi:10.1080/19475411.2014.902870

Cited by 19 publications

(17 citation statements)

References 20 publications

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“…The model had an initial condition for the rotor continuously spinning of an initial angular velocity greater than the frequency of the driving oscillation. This initial condition was confirmed expirementally in the our previous paper [25].The results of EM characterization in Figure 4(a) show that the optimal load resistance for EM is ~80 Ω regardless of actuation frequency. The optimal load resistance for PZT on the other hand does vary with actuation frequency and varies even between piezo beams when actuated at resonance frequency.…”

Section: Resultssupporting

confidence: 78%

“…This is a result of small uncontrollable differences in resonant frequency between each beam. Numerical simulations for the power output of this device, presented in a previous work [25], showed that when the PZT beams are not actuated at their natural frequency of 20 Hz, the optimal load resistance increases. Thus, a load resistance of 80 Ω and 170 kΩ was applied to the EM coils and each of the PZT beams, respectively, for the walking tests.…”

Section: Resultsmentioning

confidence: 88%

“…The desired range of operation for the device was 1-10 Hz, the most dominant frequency range of human motion, for the majority of the power generation with an extended range of up to 30 Hz, the range of frequency a person would encounter riding in a car [20]. The initial design, modeling, and simulations were presented in the previous work [24,25].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of a rotary hybrid multimodal energy harvester

Larkin

Tadesse

2014

SPIE Proceedings

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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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Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Characterization of a rotary hybrid multimodal energy harvester

Larkin

Tadesse

2014

SPIE Proceedings

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“…Hence, rotational power sources, especially for wind, human motion, some rotary machines, and some vehicle tires, are generally considered as low frequencies, compared to PZT frequency. In some cases, the wiring for output power transfer is still an issue because the PZT is rotating with the system and thus a slip ring or any other wireless transfer is needed, which makes the device more complicated [2,25,27,[48][49][50]. Also, the heavy and rapid repetitive bending or striking on the PZT with the direct excitation contact can be considered an issue because it will reduce its lifetime; however, this can be avoided in different ways [35].…”

Section: Of 25mentioning

confidence: 99%

Harvesting Energy from Planetary Gear Using Piezoelectric Material

et al. 2020

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In the present study, a rotational piezoelectric (PZT) energy harvester has been designed, fabricated and tested. The design can enhance output power by frequency up-conversion and provide the desired output power range from a fixed input rotational speed by increasing the interchangeable planet cover numbers which is the novelty of this work. The prototype ability to harvest energy has been evaluated with four experiments, which determine the effect of rotational speed, interchangeable planet cover numbers, the distance between PZTs, and PZTs numbers. Increasing rotational speed shows that it can increase output power. However, increasing planet cover numbers can increase the output power without the need to increase speed or any excitation element. With the usage of one, two, and four planet cover numbers, the prototype is able to harvest output power of 0.414 mW, 0.672 mW, and 1.566 mW, respectively, at 50 kΩ with 1500 rpm, and 6.25 Hz bending frequency of the PZT. Moreover, when three cantilevers are used with 35 kΩ loads, the output power is 6.007 mW, and the power density of piezoelectric material is 9.59 mW/cm3. It was concluded that the model could work for frequency up-conversion and provide the desired output power range from a fixed input rotational speed and may result in a longer lifetime of the PZT.

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“…Hence, it is more suitable for harvesting energy from human movements. In addition, the electromagnetic generators also yield higher power density and their costs are much lower than the piezoelectric generators [14]. For the piezoelectric generator, it needs a structural design not only to optimize the power density but also to protect the piezo element itself due to its fragility, while the structural design of the EM generator is much simpler for the application of a VEH floor.…”

Section: Introductionmentioning

confidence: 99%

Design of Kinetic-Energy Harvesting Floors

et al. 2020

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Alternative energy generated from people’s footsteps in a crowded area is sufficient to power smart electronic devices with low consumption. This paper aims to present the development of an energy harvesting floor—called Genpath—using a rotational electromagnetic (EM) technique to generate electricity from human footsteps. The dynamic models of the electro-mechanical systems were developed using MATLAB®/Simulink to predict the energy performances of Genpath and help fine-tune the design parameters. The system in Genpath comprises two main parts: the EM generator and the Power Management and Storage (PMS) circuit. For the EM generator, the conversion mechanism for linear translation to rotation was designed by using the rack-pinion and lead-screw mechanism. Based on the simulation analysis, the averaged energy of the lead-screw model is greater than that of the rack-pinion model. Thus, prototype-II of Genpath with 12-V-DC generator, lead-screw mechanism was recently built. It shows better performance when compared to the previous prototype-I of Genpath with 24-V-DC-generator, rack-pinion mechanism. Both prototypes have an allowable displacement of 15 mm. The Genpath prototype-II produces an average energy of up to 702 mJ (or average power of 520 mW) per footstep. The energy provided by Genpath prototype-II is increased by approximately 184% when compared to that of the prototype-I. The efficiency of the EM-generator system is ~26% based on the 2-W power generation from the heel strike of a human’s walk in one step. Then, the PMS circuit was developed to harvest energy into the batteries and to supply the other part to specific loads. The experiment showed that the designed PMS circuit has the overall efficiency of 74.72%. The benefit of the design system is for a lot of applications, such as a wireless sensor and Internet of Thing applications.

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HM-EH-RT: hybrid multimodal energy harvesting from rotational and translational motions

Cited by 19 publications

References 20 publications

Characterization of a rotary hybrid multimodal energy harvester

Characterization of a rotary hybrid multimodal energy harvester

Harvesting Energy from Planetary Gear Using Piezoelectric Material

Design of Kinetic-Energy Harvesting Floors

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