系统采用电流、速度双闭环控制，电流、速度的调节采用PI调节，转子磁极位置通过霍尔元件检测。
The double close loops of speed and current control is introduced in the system and the PI control is implemented in the current and speed loop, the position of rotor pole is detected by hall element.
霍尔叶片传感器主要用于检测汽车发动机曲轴位置和转速，此外还可用于检测无刷电机磁极位置及测速等。
The Hall-effect vane sensor is to be primarily used to sense the angle position and the speed of the crankshaft of the automotive engine, in addition to be used in brushless DC motors.
地球磁场多次发生南北（正负）磁极位置的变换和白垩纪超静磁带（CNS）的异常现象，这已为大家所公认。
It is generally acknowledged that geomagnetic polarity has reversed many times in geological history and an abnormal geologic phenomenon is the Cretaceous normal superchron(CNS).
考虑电机的饱和对转子位置估计的影响，建立了包含电机饱和影响的数学模型，以补偿饱和对转子磁极位置估计的影响；
Saturation effect is considered for the rotor position estimation. The mathematical model including saturation is built for compensating the effect of saturation.
最近一次进行的调查是在2001年5月，这次调查确定了最新的磁极的位置并且确定磁极大致正在以每年40公里的速度向西北方向移动。
The most recent survey, completed in May, 2001, determined an updated position for the Pole and established that it is moving approximately northwest at 40 km per year.
同时地球在尽力维持着自己正常的位置，要和太阳的磁极排列成一列。
The Earth meanwhile is trying to maintain its normal position, align with the Sun's magnetic posture.
直流电动机中的电刷能够指示直流励磁磁极的位置，又可以控制电枢电流的相位，直流电动机应是箝位电动机。
In DC motor, the locality of axis of armature MMF was determined by the brush position, here the brush possessed a function of clamping.
给出了波荡器垫补修正场的简单解析计算式，可根据垫片的位置、大小、厚度、磁极间隙等参数直接计算出对磁场及位相的修正。
An simple analytical computation formula is given for field signature of the shims to predict the field and phase perturbation according the shim position, size, thickness and magnet gap.
测量方法：为使测点的位置准确，在测量前应根据磁极形状制作测点样板(用有机玻璃板或木板)。
Measuring method: in order to make the point location accurate, in measurement shall, before making point polarity shape according to the sample (with organic glass or planks).
测量方法：为使测点的位置准确，在测量前应根据磁极形状制作测点样板(用有机玻璃板或木板)。
Measuring method: in order to make the point location accurate, in measurement shall, before making point polarity shape according to the sample (with organic glass or planks).
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