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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

Analytic models of operation by human upper limb motion. (a) Turning; (b) Pulling.
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sensors-15-15853-f002: Analytic models of operation by human upper limb motion. (a) Turning; (b) Pulling.

Mentions: Analytic models of turning and pulling operations are illustrated in Figure 2 to compare their efficiency in transferring mechanical power from upper limb motion to the generator shaft. Detailed parameters of each model are listed in Table 1. The turning torque τc applied on the shaft in Figure 2a is represented by Equation (1):(1)τc=rc⋅Ft⋅sinθf


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

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

Analytic models of operation by human upper limb motion. (a) Turning; (b) Pulling.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-15853-f002: Analytic models of operation by human upper limb motion. (a) Turning; (b) Pulling.
Mentions: Analytic models of turning and pulling operations are illustrated in Figure 2 to compare their efficiency in transferring mechanical power from upper limb motion to the generator shaft. Detailed parameters of each model are listed in Table 1. The turning torque τc applied on the shaft in Figure 2a is represented by Equation (1):(1)τc=rc⋅Ft⋅sinθf

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