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相关概念视频

Electro-mechanical Systems01:19

Electro-mechanical Systems

927
Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
A key component of the DC motor is the armature, a rotating circuit positioned within a magnetic field. As an electric current passes through the...
927
Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

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Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process,...
3.2K
Three-Phase Short Circuit—Unloaded Synchronous Machine01:21

Three-Phase Short Circuit—Unloaded Synchronous Machine

128
Conducting a three-phase short circuit test on an unloaded synchronous machine helps understand its impact on the system. The AC fault current's oscillogram, with the DC offset removed, reveals that the waveform amplitude decreases from an initially high value to a steady-state level for one phase of the machine.
This behavior occurs due to the magnetic flux produced by the short-circuit armature currents. Initially, these currents follow high-reluctance paths but eventually shift to...
128
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

3.9K
The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
3.9K
Back EMF01:24

Back EMF

2.8K
Generators convert mechanical energy into electrical energy, whereas motors convert electrical energy into mechanical energy. A motor works by sending a current through a loop of wire located in a magnetic field. As a result, the magnetic field exerts a torque on the loop. This rotates a shaft, extracting mechanical work from the electrical current sent in initially. When the coil of a motor is turned, magnetic flux changes through the coil, and an emf (consistent with Faraday's law) is...
2.8K
Power System Three-Phase Short Circuits01:21

Power System Three-Phase Short Circuits

78
Determining the subtransient fault current in a power system involves representing transformers by their leakage reactances, transmission lines by their equivalent series reactances, and synchronous machines as constant voltage sources behind their subtransient reactances. In this analysis, certain elements are excluded, such as winding resistances, series resistances, shunt admittances, delta-Y phase shifts, armature resistance, saturation, saliency, non-rotating impedance loads, and small...
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相关实验视频

Updated: Jun 12, 2025

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
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在使用香农 entropy 的 DC 电机/发电机中用于火花检测的电流和流浪流组合分析.

Jorge E Salas-Robles1, Vicente Biot-Monterde2, Jose A Antonino-Daviu2

  • 1Escuela Técnica Superior de Ingeniera Aeroespacial y Diseño Industrial, Universitat Politècnica de València (UPV), Camino de Vera s/n, 46022 Valencia, Spain.

Entropy (Basel, Switzerland)
|September 27, 2024
PubMed
概括

这项研究引入了一种新方法,通过分析电信号中的香农来监测刷直流电机的健康状况. 这种预测性维护工具可以检测火花,防止故障并提高电动汽车的可靠性.

关键词:
香农 Entropy 香农的是什么意思刷子直流机器 刷子直流机器目前的信号是当前的信号.流浪流量信号的流浪信号

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科学领域:

  • 电气工程和应用物理学
  • 机械工程和三角学.
  • 信号处理和机器状态监控

背景情况:

  • 刷式直流电机 (DCM) 在汽车应用中至关重要,如电动汽车 (EV),因为它们的性能特性.
  • 在DCM中过早故障,通常是由刷切换器火花引起的,导致经济损失相当大,运行可靠性降低.
  • 有效的状态监控对于预测性维护和缓解关键电机系统故障至关重要.

研究的目的:

  • 开发和验证用于分析DCM信号中香农的时间和频率演变的新方法.
  • 为了研究火花现象,信号和刷直流电机的故障严重程度之间的关系.
  • 建立一个预测性维护框架,用于早期检测和评估DCM中的换算质量.

主要方法:

  • 采用了两种信号处理方法:用于间接分析的短时间里埃转换 (STFT) 和用于直接分析的S转换.
  • 为了计算信号复杂性和信息含量,我们计算了农对于具电流和流浪流量信号.
  • 使用实验数据将火花活动与和频谱特征变化相关联.

主要成果:

  • 增加的火花活动显著提高了系统,特别是由于分析信号中明显的低频波.
  • 两种STFT和S-Transform方法都有效地捕捉了与火花相关的的时间和光谱演变.
  • 观察到火花强度,度和信号的增加之间存在明显的相关性.

结论:

  • 提出的基于的分析提供了一种可靠的方法来检测和量化刷直流电机中的火花.
  • 这种技术可以开发故障严重性指标 (关键性能指标 - - 关键性能指标) 以实时监控状态.
  • 这些发现支持该方法作为预测性维护工具的实施,以提高DCM的可靠性并防止昂贵的故障.