本文介绍一种由交流变频调速器构成的恒张力同步拖动系统，应用于圆筒针织物冷轧堆设备上。
A synchronized towing system with constant tension composed of AC Frequency conversion speed regulator is introduced.
针对无齿轮电梯对电机拖动的要求，实现了一种基于DSP嵌入式芯片的永磁同步电机调速系统。
The paper presents a control system of an interior permanent magnet synchronous motor (IPM PM) for elevator driver without gear box. The system is based on DSP embedded processor.
最后，利用以上研究的驱动系统和永磁同步电机，实际组成一套电梯拖动系统。
At last, based on the research of the machine and driving system, compose a elevator driving system.
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