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Energy Harvesting from Upper-Limb Pulling Motions for Miniaturized Human-Powered Generators.

Yeo J, Ryu MH, Yang Y - Sensors (Basel) (2015)

Bottom Line: This study proposes a portable human-powered generator which is designed to obtain mechanical energy from an upper limb pulling motion for improved human motion economy as well as efficient human-mechanical power transfer.Its small form factor (50 mm × 32 mm × 43.5 mm, 0.05 kg) and the substantial electricity produced verify the effectiveness of the proposed method in the utilization of human power.It is expected that the developed generator could provide a mobile power supply.

View Article: PubMed Central - PubMed

Affiliation: Healthcare Engineering, Chonbuk National University, Deokjin-dong Jeonju 664-14, Korea. yeojjin85@jbnu.ac.kr.

ABSTRACT
The human-powered self-generator provides the best solution for individuals who need an instantaneous power supply for travel, outdoor, and emergency use, since it is less dependent on weather conditions and occupies less space than other renewable power supplies. However, many commercial portable self-generators that employ hand-cranking are not used as much as expected in daily lives although they have enough output capacity due to their intensive workload. This study proposes a portable human-powered generator which is designed to obtain mechanical energy from an upper limb pulling motion for improved human motion economy as well as efficient human-mechanical power transfer. A coreless axial-flux permanent magnet machine (APMM) and a flywheel magnet rotor were used in conjunction with a one-way clutched power transmission system in order to obtain effective power from the pulling motion. The developed prototype showed an average energy conversion efficiency of 30.98% and an average output power of 0.32 W with a maximum of 1.89 W. Its small form factor (50 mm × 32 mm × 43.5 mm, 0.05 kg) and the substantial electricity produced verify the effectiveness of the proposed method in the utilization of human power. It is expected that the developed generator could provide a mobile power supply.

No MeSH data available.


Related in: MedlinePlus

Experimental set-up for the simultaneous measurement of mechanical input and electric output power.
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sensors-15-15853-f007: Experimental set-up for the simultaneous measurement of mechanical input and electric output power.

Mentions: In order to verify the performance of the proposed pulling energy harvester, both the pulling force and the generated electric voltage were measured. As shown in Figure 6, the pulling force of the upper limb was measured at the end of the string by using a push-pull gauge with data logging capability. Concurrently, the generated electric voltage was measured with a resistive load connected to the output terminals of the generator by using a data acquisition device. The resistance was set to 36 Ω, which was the same value as the internal resistance of the generator determined by the coil wires. Figure 7 shows the experimental setup. The measuring experiment was performed for 10 consecutive pulling cycles. The mechanical input power and corresponding electric output power were calculated from the recorded data. The entire time-profiles of the force and the voltage were recorded not only to compute average power but also for an in-depth analysis of the dynamic characteristics of its operation.


Energy Harvesting from Upper-Limb Pulling Motions for Miniaturized Human-Powered Generators.

Yeo J, Ryu MH, Yang Y - Sensors (Basel) (2015)

Experimental set-up for the simultaneous measurement of mechanical input and electric output power.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541857&req=5

sensors-15-15853-f007: Experimental set-up for the simultaneous measurement of mechanical input and electric output power.
Mentions: In order to verify the performance of the proposed pulling energy harvester, both the pulling force and the generated electric voltage were measured. As shown in Figure 6, the pulling force of the upper limb was measured at the end of the string by using a push-pull gauge with data logging capability. Concurrently, the generated electric voltage was measured with a resistive load connected to the output terminals of the generator by using a data acquisition device. The resistance was set to 36 Ω, which was the same value as the internal resistance of the generator determined by the coil wires. Figure 7 shows the experimental setup. The measuring experiment was performed for 10 consecutive pulling cycles. The mechanical input power and corresponding electric output power were calculated from the recorded data. The entire time-profiles of the force and the voltage were recorded not only to compute average power but also for an in-depth analysis of the dynamic characteristics of its operation.

Bottom Line: This study proposes a portable human-powered generator which is designed to obtain mechanical energy from an upper limb pulling motion for improved human motion economy as well as efficient human-mechanical power transfer.Its small form factor (50 mm × 32 mm × 43.5 mm, 0.05 kg) and the substantial electricity produced verify the effectiveness of the proposed method in the utilization of human power.It is expected that the developed generator could provide a mobile power supply.

View Article: PubMed Central - PubMed

Affiliation: Healthcare Engineering, Chonbuk National University, Deokjin-dong Jeonju 664-14, Korea. yeojjin85@jbnu.ac.kr.

ABSTRACT
The human-powered self-generator provides the best solution for individuals who need an instantaneous power supply for travel, outdoor, and emergency use, since it is less dependent on weather conditions and occupies less space than other renewable power supplies. However, many commercial portable self-generators that employ hand-cranking are not used as much as expected in daily lives although they have enough output capacity due to their intensive workload. This study proposes a portable human-powered generator which is designed to obtain mechanical energy from an upper limb pulling motion for improved human motion economy as well as efficient human-mechanical power transfer. A coreless axial-flux permanent magnet machine (APMM) and a flywheel magnet rotor were used in conjunction with a one-way clutched power transmission system in order to obtain effective power from the pulling motion. The developed prototype showed an average energy conversion efficiency of 30.98% and an average output power of 0.32 W with a maximum of 1.89 W. Its small form factor (50 mm × 32 mm × 43.5 mm, 0.05 kg) and the substantial electricity produced verify the effectiveness of the proposed method in the utilization of human power. It is expected that the developed generator could provide a mobile power supply.

No MeSH data available.


Related in: MedlinePlus