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相关概念视频

Generator Voltage Control01:21

Generator Voltage Control

93
Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand,...
93
Sequence Networks of Rotating Machines01:24

Sequence Networks of Rotating Machines

88
A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
Zero-sequence current induces a voltage drop across the generator's neutral impedance and other...
88
DC Generator01:19

DC Generator

628
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...
628
Electric Generator: Alternator01:25

Electric Generator: Alternator

2.4K
Electric generators induce an emf by rotating a coil in a magnetic field. A simple alternator is an AC generator that creates electrical energy that varies sinusoidally with time. A simple alternator consists of a conducting loop that is placed inside a uniform magnetic field. The loop is connected to split rings connected to the external circuit with the help of brushes.
The magnetic flux passing through the coil varies sinusoidally as the loop rotates inside the magnetic field. This...
2.4K
Simplified Synchronous Machine Model01:30

Simplified Synchronous Machine Model

161
The Synchronous Machine Model is a fundamental tool in analyzing and ensuring the transient stability of power systems. This model simplifies the representation of a synchronous machine under balanced three-phase positive-sequence conditions, assuming constant excitation and ignoring losses and saturation. The model is pivotal for understanding the behavior of synchronous generators connected to a power grid, particularly during transient events.
In this model, each generator is connected to a...
161
Generation of Three-Phase Voltage01:21

Generation of Three-Phase Voltage

326
A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.
As the rotor...
326

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相关实验视频

Updated: May 16, 2025

The Modular Design and Production of an Intelligent Robot Based on a Closed-Loop Control Strategy
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The Modular Design and Production of an Intelligent Robot Based on a Closed-Loop Control Strategy

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由Sb2Te3基热电驱动的强大的同质分段发电机.

Min Wang1,2, Qiang Zhang1,3, Kaikai Pang1,3

  • 1Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China.

Advanced materials (Deerfield Beach, Fla.)
|April 3, 2025
PubMed
概括

这项研究通过将Sb2Te3与Cd和S进行合来增强热电 (TE) 材料,显著提高低级热回收效率. 新材料的峰值ZT为1.1%,发电机效率为9.3%.

关键词:
这就是Sb2Te3Te3的意思.双高性能的高性能均的细分是同质的微观结构的演变 微观结构的演变热电发电机是一种热电发电机.

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Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator
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A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump
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A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump

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科学领域:

  • 材料科学 材料科学 材料科学
  • 固态物理 固态物理
  • 能源转换 能源转换

背景情况:

  • 热电 (TE) 技术对于废热回收至关重要,特别是在低级热 (<650 K) 方面.
  • 传统的Bi2Te3合金具有有限的TE效率 (<7%) 和狭窄的操作温度范围.
  • 需要先进的TE材料,以提高实际应用的效率和机械性能.

研究的目的:

  • 通过兴奋剂增强Sb2Te3基材料的热电性能.
  • 研究 (Cd) 和硫 (S) 兴奋剂对微观结构和热电特性的影响.
  • 开发一台高效的热电发电机,用于低档废热采集.

主要方法:

  • 微结构工程通过使用Cd和S的Sb2Te3进行兴奋剂.
  • 格子导热率,状态密度有效质量和带间隙的表征.
  • 使用优化的Bi-Sb-Te合金制造和测试一个细分热电发电机.

主要成果:

  • 用Cd和S进行兴奋剂,在300K时将网格导热率降低了45%.
  • Cd0.04Sb1.96Te2.94S0.06样本在650K时达到1.1的峰值值值 (ZT).
  • 一个细分的TE发电机在350K温度梯度下证明了9.3%的认证效率.
  • 该材料具有出色的机械强度 (压力为197 MPa,曲为56 MPa).

结论:

  • Cd 和 S 兴奋剂有效调节 Sb2Te3 的微结构,增强热电性质.
  • 开发的材料显示出有效的低度废热回收的巨大潜力.
  • 这项研究扩大了基于Bi2Te3的热电的操作温度,并为实际的TE发电提供了可行的途径.