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高磁场

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Permanent magnet synchronous motors have been widely used as AC drives over the last two decades due to their high efficiency, high power density and no dc field winding in the rotor. It is well known motion control of PMSM requires accurate position and velocity signals to realize field orientation.

永磁同步电动机由于无需励磁电流、运行效率和功率密度都很高,在过去的二十年里已被广泛地应用在交流调速传动中,但它的高性能控制需要精确的转子位置和速度信号去实现磁场定向。

In new structure, magnetic field in winding window area is distributed more uniform than that of simple lumped air-gap structure, resulting in reduction of AC winding loss greatly.

新结构通过在开集中气隙的高磁导率磁芯柱与线圈间加入低磁导率磁材料,为电感器的磁压分布构造一辅助磁路,进而使电感器线圈窗口内的磁场分布均匀化,大大减小了线圈涡流损耗。

Requirement for arc voltage during opening of field breaker is higher and higher, for de-excitation with varistor ,generally adopted for large hydraulic generator. In fact, E.M.Fof field winding is required higher than threshold of varistor during opening of field breaker.

大型水轮发电机通常采用的非线性电阻灭磁的方法,对灭磁开关的开断弧压要求愈来愈高,其机理是要求开关开断时,磁场绕组的自感电势大於非线性电阻的残压。

The device of claim 1 wherein said magnet has a flux density of about 12,000 gauss.

索赔1,在那里说的磁铁有大约12,000高斯的磁场密度的设备。

The electrons are accelerated in the diffusion region near the X point, and the acceleration process can be roughly into two steps : firstly the electrons are accelerated in the z direction due to the electric field, then, they gyrate surrounding the magnetic field with the action of the Lorentz force and get higher velocity in the x direction.

电子在X点附近扩散区中被加速,且加速过程分为两步:先由z方向电场加速,进而在Lorentz力作用下,使其绕磁场回旋并在x方向获得高速度。

This is the history of the first high-resolution solid-state magnetic field sensor.

这是历史上的第一种高分辨率固态磁场传感器。

The higher the rotating speed is, the stronger the effect of electromagnetic stirring on the liquid is, and the smaller the grains of the welded metal are, the more homogeny of eutectic structure of Al- l2Si alloy is.

磁场的旋转速率越高,对液态的电磁搅拌作用越强,焊缝金属的晶粒越细小、Al-12Si合金共晶组织越均匀。

One of these testing methods, eddy current, has been widely used for metal thickness measuring because of its good sensitivity, high test speed , non-contact and other advantage. The principle of eddy current testing is that, when the test coil is close to the metal conductor with alternating current, the eddy current would be inducing in the conductor, and correspongdingly, the eddy current would affect the original magnetic field, the result is the coils impedance and inducing voltage changed.

其中涡流无损检测技术具有灵敏度高、检测速度快、非接触等特点而广泛应用于金属厚度检测,它的原理是当载有交变电流的检测线圈靠近金属导体时在导体中产生涡流,该涡流又影响原磁场,使得线圈的阻抗和感应电压发生变化,通过分析阻抗或感应电压的变化来获得被测导体的信息。

There are various ways to shield static magnetic field. The principles of which come to one: to form a relatively closed space by using high magnetic inductivity material, in which space the magnetic flux runs through side of the shield, and thus the magnetic intensity is reduced.

静磁场屏蔽方式可以有许多方法,其原理都是采用高磁导率材料作为屏蔽体材料,在需要屏蔽的空间内形成一个相对密闭的空间,使得磁通沿着屏蔽体侧壁流过,从而减低屏蔽空间内的磁场强度,以达到屏蔽效果。

The x-y spatially-resolved mapping of polarized Raman scattering spectra from a single tetrapod-like ZnO nanostructure were proposed and performed, with different polarized scattering configuration by utilizing the intrinsic geometry configuration.

此外,通过对量子线的磁阻测量,揭示一维结构中载流子在磁场中的输运行为。 2。首次根据四角晶须状ZnO纳米结构的天然的空间几何构型,采用不同的Raman散射配置,研究单个纳米结构的具有高空间分辨率的偏振Raman二维扫描谱。

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With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务,乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐,因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。

Closes the eye, the deep breathing, all no longer are the dreams as if......

关闭眼睛,深呼吸,一切不再是梦想,犹如。。。。。。