SERVOMOTORS are fast-response, closed-loop-controlled motors capable of providing a programmed function of acceleration or velocity, as well as of holding a fixed position against a load. Closed loop means that sensors on the output device being moved feed back information on its position, velocity, and acceleration. Circuitry in the motor controller responds to the fed back information by reducing or increasing (or reversing) the current flow to the motor. Precise positioning of the output device is then possible, as is control of the speed and shape of the motor's response to changes in load or input commands. These are very expensive devices which are commonly used in applications such as moving the flight control surfaces in aircraft and guided missiles, and in controlling robots, for example. Servomotors have lower power and torque capacity than is available from non servo AC or DC motors