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相关概念视频

Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

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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...
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Magnetic Force Between Two Parallel Currents01:13

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Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
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Motional Emf01:22

Motional Emf

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Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the...
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Eddy Currents01:25

Eddy Currents

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Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
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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,...
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Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
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一个高速的电流源,用于磁石学应用.

Lei Xie1, Chuan Lu2, Jianfei Yin3

  • 1Key Laboratory of Optoelectronic Technology and Systems (Education Ministry of China), Chongqing University, Chongqing, 400044, People's Republic of China. lxie@cqu.edu.cn.

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概括
此摘要是机器生成的。

一个新的超级电容器和巴克转换器电流源可以快速,实时控制磁石阻尼器. 这种SSBC电流源实现了毫秒的响应时间,显著提高了磁铁神经设备的性能.

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科学领域:

  • 工程 工程师 工程师 工程师
  • 材料科学 材料科学 材料科学
  • 电气工程 电气工程

背景情况:

  • 磁铁神经系统 (MR) 需要快速电流源来实现实时的半活性控制.
  • 电流阻尼器 (MRD) 的响应时间通常受到较慢的电流源速度的限制.
  • 当前MR系统的局限性阻碍了MR设备技术的全部潜力.

研究的目的:

  • 开发一种可编程,高速,低成本的电流源,专门用于MR设备.
  • 为了增强磁雷学阻尼器的实时控制能力.
  • 克服现有电流源对MR应用的响应时间限制.

主要方法:

  • 提出了一个新的超级电容器和转换器 (SSBC) 电流源战略.
  • 实施了双相方法:超级电容器用于快速提升电流和巴克转换器用于保持输出.
  • 进行SSBC电源性能理论建模和实验验证.

主要成果:

  • 在95%输出时,达到0.44ms (3A),0.84ms (6A) 和1.88ms (9A) 的响应时间.
  • 证明响应速度比直接超级电容器或巴克转换器驱动快24.6至43.7倍.
  • 经过验证的高速响应稳定性在100个启/关周期内,仅显示1.1%的波动.

结论:

  • 该SSBC电流源为MR设备控制提供了显著的进步.
  • 这种新的电源供应战略为MR应用提供了前所未有的速度和可靠性.
  • 预计这项开发将成为推动更广泛地采用磁石学技术的关键推动力.