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相关概念视频

DC Generator01:19

DC Generator

2.0K
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

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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...
808
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

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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,...
1.3K
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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相关实验视频

Updated: Jan 29, 2026

A Simple and Inexpensive Running Wheel Model for Progressive Resistance Training in Mice
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车轮内压电直流发电机具有零电阻扭矩.

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
概括
此摘要是机器生成的。

本研究介绍了一种新型直流压电发电机 (DC-PG),用于高效的小规模电力. 创新的设计为低负载环境中的自动供电物联网 (IoT) 设备提供了实用解决方案.

关键词:
一个直流发电机,一个直流发电机.物联网的物联网,就是物联网.在PMN-PT中使用.这是一种压电式电体.自主力量的力量.

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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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Magnetic Tweezers for the Measurement of Twist and Torque
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科学领域:

  • 收集能源 收集能源
  • 材料科学 材料科学 材料科学
  • 机械工程 机械工程

背景情况:

  • 传统的电磁发电机在低功耗应用中面临局限性,原因是机械复杂性,体积庞大以及在小规模下降的效率.
  • 来自伦兹定律的阻力扭矩进一步损害了在低负载环境中的性能,限制了适用于某些应用的适用性.

研究的目的:

  • 提出和评估一款超越传统发电机的局限性的新型直流轮内压电发电机 (DC-PG).
  • 为了证明具有零电阻扭矩和无需整形的高效发电,适合低负载条件.

主要方法:

  • 在旋转过程中使用连续相位偏振的车轮直流压电发生器 (DC-PG) 的开发.
  • 在不增加显著的重量或体积的情况下,将DC-PG集成到一个行李箱轮中.
  • 在现实条件下的测试,在3-5公里/小时的20公斤负载下测试,以测量峰值输出功率和充电能力.

主要成果:

  • 在现实的条件下,DC-PG实现了4.28mW的峰值功率,超过了传统的基于交流的压电系统.
  • 发电机提供稳定,低波纹的直流输出,能量损耗最小,不需要纠正.
  • 成功为无线物联网 (IoT) 位置传感器供电,在134秒内充电5V电容.

结论:

  • 紧,无整形的DC-PG是有效的小规模发电和自动供电物联网应用的可行解决方案.
  • 消除电磁阻和高效率使得在低速度,低负载环境中实现能源自主.
  • 这项技术为便携式电子设备和传感器网络的可持续电力开辟了新的可能性.