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.
永磁同步电动机系统具有力矩系数大、力矩波动小以及控制灵活等优点，在许多精密伺服控制系统中得到广泛应用。
Due to the large torque coefficient, small torque ripple and ease of control, permanent magnet synchronous motor (PMSM) system has been widely used in many accurate servo control systems.
步进电动机是一种脉冲控制的伺服电动机。
Stepping motor is a kind of motors that are controlled by pulse.
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