概述了变压器绕组绕线机可采用的一种变频调速技术方法，并详细介绍其结构、工作原理及特点。
A frequency control technique method used in transformer winding machine is summed up, and its structure, operation principle and characteristic are introduced in datial.
永磁同步电机调速系统是采用变压变频技术对电机进行调速的控制系统。
The speed-adjusted system for Permanent magnet synchronous motor is used VVVF technology.
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