Fly field frequency control is a key to fly field safety.
飞场频率管控对飞行安全极为重要。
The result show that the system possesses the features of simple structure and excellent control characteristics etc without detecting the slip frequency of the rotor's magnetic field.
结果表明：不检测转子磁链的滑差频率矢量控制系统具有结构简单、控制性能优良等特点。
The Pulse Generators PGs are equipped to detect the rotor frequency of induction traction motors for the torque control in railway vehicle traction field.
铁道机车车辆牵引领域中的转矩控制是利用脉冲发生器（PG）来检测牵引感应电动机的转子频率。
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