本文主要介绍了变频器在国产单双色单张纸平版印刷机改造中的应用，以及对变频器的一些功能的要求。
The paper introduces the application of inverter in the reform of homemade single - double-color singleton paper lithography machine, followed with some functional demands for inverter.
分析了变频器的两种主要制动方式，给出了变频器在矿井提升机应用中的选用原则。
The paper analyses the two main approaches for braking the transducer, offers its selection principle in mine hoist.
介绍了应用单片机和变频器组成的数字式变频交流伺服系统及数字PID调节器设计。
This paper describes an AC frequency conversion servo system which is composed of single chip and converter and designs a digital PID adjuster.
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