Motion pulse motor3/17/2024 ![]() ![]() This write-up will be focused on electronic servos used in remote control applications, since these are most commonly used in hobbyist projects. They are used in a wide array of industrial and personal applications such as valve control, robotic parts, and actuators for hobby projects. Servomotors use digital encoders or potentiometers to determine the position of the drive shaft. Servomotors are a subcategory of servomechanisms, and are usually what people are referring to when they say servo. A cruise control system is a modern example of a servomechanism because the speed of the car influences the throttle position, which is adjusted to maintain the desired speed. The first example of a mechanical negative feedback system was an 18th-century steam engine governor, which used the engine speed as an input in a mechanical system to cap the engine speed at a safe rate. A negative feedback system feeds its output into the input in order to provide error correction or speed limitation. The term servo originates from servomechanism, which refers to any system that uses negative feedback to correct its position or speed. Please read this article if you're unfamiliar with PWM before proceeding. Note: Pulse width modulation(PWM) is an important component of servo operation. ![]()
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