调节电位器，便可调节电动机的转速。
Regulate the potentiometer, the then adjustable electric motorrev.
调频驱动器(也称为变频驱动器)能够调节电动机速率以最大限度满足输出要求，可节省10% - 50%的能量。
Adjustable frequency drives (also known as variable frequency drives) adjust a motor's speed to closely match output requirements, resulting in a typical energy savings of 10 to 50 percent.
它采用大功率的SCR组成电压调节电路，这样交流电动机就可以低压起动。
It adopts SCR with large power to establish the voltage adjustment circuit, so the AC motor can be started with low voltage.
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