以下为句子列表：
英文: Variable speed motor drive (VSMD) is used to control the electrical machine by modifying the frequency of its output voltage.
中文: 通过改变变频器的输出电压可以控制被拖电动机的转速。
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英文: CPU made by Siemens is used as PLC of the system,CP70L industrial touch screen made by Digital Company is used for upstage communication of PLC,and a variable speed motor is used for driving the cutting conveyor belt.
中文: 该控制系统的PLC采用西门子公司的CPU，选用美国Digital 公司的GP70L工业触摸显示屏作为PLC上位通讯，切割输送带电机采用变频调速。
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