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関連する概念動画

DC Generator01:19

DC Generator

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An alternator converts mechanical energy into electrical energy that varies sinusoidally, resulting in AC current. Meanwhile, a DC generator converts mechanical energy into electrical energy, which are DC pulses with the same polarity. The construction of a DC generator is similar to that of an alternator, except that the pair of slip rings is replaced by a single split ring, also called a commutator. The commutator functions like a periodic rotary switch; it changes the contacts with the...
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Torque01:10

Torque

22.4K
Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
Torque can be considered as the rotational counterpart to force. Since forces change the translational...
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Torque Free Motion01:15

Torque Free Motion

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The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
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Net Torque Calculations01:19

Net Torque Calculations

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When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to...
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DC Battery01:21

DC Battery

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A conductor needs to be a component of a path that creates a closed loop or full circuit to have a continuous current flowing through it. A current starts to flow if an electric field is created inside an isolated conductor that is not part of a full circuit. The conductor quickly develops a net positive charge at one end and a net negative charge at the other. These charges generate an electric field opposite the direction of the applied electric field, which reduces the current. Eventually,...
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Power01:08

Power

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The concept of work involves force and displacement; meanwhile, the work-energy theorem relates the net work done on a body to the difference in its kinetic energy, calculated between two points on its trajectory. While none of these quantities or relations involves time explicitly, we know that the time available to accomplish work is often just as important as the amount of work itself. For example, sprinters in a race may have achieved the same velocity at the finish, therefore,...
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A Simple and Inexpensive Running Wheel Model for Progressive Resistance Training in Mice
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インホイールピエゾDC発電機ゼロ抵抗トルク

Hyun Soo Kim1,2, Hyunseok Song3, In Woo Oh1,4

  • 1Electronic and Hybrid Material Research Center, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|January 28, 2026
PubMed
まとめ
この要約は機械生成です。

この研究では、効率的で小規模な電力のための新しい直流ピエゾ発電機（DC-PG）を紹介します。革新的な設計は、低負荷環境での自己給電型モノのインターネット（IoT）デバイスの実用的なソリューションを提供します。

キーワード:
DC発電機モノのインターネットPMN‐PTピエゾ自己給電

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Construction of Constant-Load (Isotonic) and Constant-Velocity (Isokinetic) Torque-Velocity-Power Profiles In vivo for the Rat Plantar Flexors
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科学分野:

  • エネルギーハーベスティング;材料科学;機械工学

背景:

  • 従来の電磁発電機は、機械的複雑さ、かさばり、小規模での効率低下により、低電力アプリケーションでの制限に直面しています。;レンツの法則による抵抗トルクは、低負荷環境での性能をさらに損ない、特定のアプリケーションへの適合性を制限します。

研究 の 目的:

  • 従来の発電機の制限を克服する新しいインホイール直流ピエゾ発電機（DC-PG）を提案および評価すること。;抵抗トルクゼロで整流不要な効率的な発電を実証し、低負荷条件に適していることを示すこと。

主な方法:

  • 連続的な位相内分極を利用したインホイール直流ピエゾ発電機（DC-PG）の開発。;DC-PGを、大幅な重量や体積を追加せずにスーツケースのホイールに統合すること。;ピーク電力出力と充電能力を測定するために、20 kgの負荷で3〜5 km/hの現実的な条件下でのテスト。

主要な成果:

  • DC-PGは、現実的な条件下で4.28 mWのピーク電力を達成し、従来のACベースのピエゾシステムを上回りました。;発電機は、整流を必要としない最小限のエネルギー損失で、安定した低リップルのDC出力を提供しました。;ワイヤレスモノのインターネット（IoT）位置センサーに電力を供給し、5 Vコンデンサを134秒で充電することに成功しました。

結論:

  • コンパクトで整流不要なDC-PGは、効率的な小規模発電および自己給電型IoTアプリケーションの実行可能なソリューションです。;電磁抵抗の排除と高効率により、低速、低負荷環境でのエネルギー自律が可能になります。;この技術は、ポータブルエレクトロニクスおよびセンサーネットワークにおける持続可能な電力の新しい可能性を開きます。