Currents create magnetic fields, leading to a third variable, magnetic flux, which characterises the field's strength.
电流产生了磁场，导致第三个变量的产生-磁通量，它表示磁场的强弱。
"We've always known that the Earth's magnetic field is variable, constantly evolving in time," Raymond said.
“众所周知地球的磁场是变化的，无时无刻不在变化”雷蒙德教授说。
More precisely it tells you that what you might have learned about electric fields deriving from electric potential becomes false if you have a variable magnetic field.
更精确地说，电势产生电场，这一观点是错误的，如果忽略变化磁场的存在的话。
Variable magnetic pole DC motor can resolve the problem of commutator existing in the traditional DC motor.
变磁极性直流电机解决了传统直流电机的换向器问题。
Unlike the gravitational acceleration, the magnetic acceleration is a location-dependent variable and its magnitude and direction vary with the magnetic circuit configuration.
与重力加速度相比，磁加速度是一个依赖于空间位置的变量，其大小和方向随外磁场的磁路布置发生改变。
The vector magnetic potential is regarded as a variable to gain the two-dimension solution of excitation magnetic field and armature response magnetic field.
并以矢量磁位作为求解变量得到励磁磁场和电枢反应磁场的二维解。
These variable reluctance, magnetic sensors are the simplest, most economical form of speed sensing.
这些可变磁阻，磁性传感器是最简单，最经济的形式感的速度。
Magnetic Compensated Hall Sensors' theory and merits are introduced in this paper. The application in variable frequency machines, UPS and direct-current drive controller is also given.
介绍磁补偿霍尔传感器的工作原理及其优点，讨论了它在变频调速电机、不间断电源(ups)及直流驱动控制方面的应用。
Aimed at the nonlinearity and uncertainty of magnetic suspension system, a slide mode variable structure controller is designed based on feedback linearization.
针对磁悬浮系统的非线性和不确定性，设计了基于反馈线性化的滑模变结构悬浮控制器。
Experiments for the prototype indicate that using the structure of double-stator and three-phase series magnetic circuit, the hybrid variable reluctance motor has higher ratio of torque to volume.
为原型的实验表明，采用双定子和三相串联磁路的结构，混合可变磁阻电机的转矩与体积的比例较高。
This paper presents a variable parameter PID controller applied to the magnetic bearings system. The parameters turning principle of this controller is proposed.
提出了主动磁悬浮轴承的一种变参数PID控制方案，给出了控制器参数的整定原则。
Aimed at the nonlinear magnetic field and the imprecise model of switched reluctance motor, the variable-structure control method with sliding mode is presented.
针对开关磁阻电机存在磁场严重的非线性且数学模型不精确等问题，提出了一种滑模变结构控制方法。
The displacement current corresponding to a variable irrotational electric field does not excite any magnetic field.
对应于可变有源无旋电场的位移电流不激发磁场。
In order to get a good performance on preventing cavitation, the impeller of magnetic driving pump is designed in low-NPSHR method and variable-pitch inducer is installed.
为了获得良好的抗汽蚀性能，对磁力泵叶轮采取低汽蚀余量设计措施，同时配置变螺距诱导轮。
In this article, it is pointed out that calculating induced electric field caused by variable magnetic field in constant velocity by analogical method is a simple method.
用类比方法来计算以恒定速率变化的磁场产生的感应电场是一个简便的方法。
A new viewpoint on electric essence of the magnetism is presented in this paper. That's to say why the variable electric field induces magnetic field.
对为什么电场的变化会产生磁场，进而产生磁力这一磁现象电本质进行了讨论研究。
At present, the frequency of the magnetic field applied to heart stimulation is fixed, not variable according to the physiological characteristic of the heart.
目前应用于心脏刺激的磁场频率都是固定的，而不是根据心脏的生理特征实现的磁场刺激。
Danfoss Variable speed driver can drive the permanent magnetic motor via open-loop or close-loop method.
丹佛斯变频器可以开环或闭环方式驱动交流永磁同步电机。
Danfoss Variable speed driver can drive the permanent magnetic motor via open-loop or close-loop method.
丹佛斯变频器可以开环或闭环方式驱动交流永磁同步电机。
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