Electric Motors ME350 Basic types >DC Motors:speed and rotational direction control via voltage 二 Easy to control torque via current low voltage 二 linear torque-speed relations 三 Quick response >AC Motors:smaller,reliable,and cheaper 二 speed fixed by AC frequency 二 low torque at low speed 二 difficult to start 66 ME 350 • Basic types ¾DC Motors: speed and rotational direction control via voltage = Easy to control torque via current = low voltage = linear torque-speed relations = Quick response ¾AC Motors: smaller, reliable, and cheaper = speed fixed by AC frequency = low torque at low speed = difficult to start Electric Motors