伺服电动机更容易控制，但是他们的功率都比较小，需要明确的电压，and are less intuitive。
Servos are much easier to control, but they generally are less energy efficient, have explicit voltage requirements, and are less intuitive.
电压控制和无功功率的控制是分不开的。
它具有输入阻抗高、电压控制和用低压控制大功率输出的特点。
It is a voltage-controlled device with high input impedance, which makes it possible to control higher output power with a lower input voltage.
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