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无速度传感器技术的研究是一个很重要的方向。
The study on speed sensorless is an important research field.
无速度传感器技术能够简化调速系统的硬件结构，降低系统的成本，是近年来交流调速领域的研究热点。
The speed sensorless technique which can simply the hardware structure of the variable speed system and reduce the system cost is a very hotspot of current research works.
异步电机无速度传感器矢量控制技术提高了交流传动系统的可靠性，降低了系统的实现成本。
The speed sensorless vector control of induction motor technology enhances the reliability of AC driving system, and reduces the realization cost.
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