![]() ![]() PWM is used in a variety of applications, including controlling servo movement or position. Pulse width modulation is a type of digital signal. The potentiometer offers an absolute position any time the controller reads the sensor, though that reading may not reflect the linear actuator shaft’s actual position. The benefit of using a potentiometer feedback system in a linear actuator is that the controller doesn’t have to keep the state or remember where the actuator shaft is. But what is a potentiometer used for? The potentiometer is used to read the position of an actuator as it cycles. It is adaptable to applications where a closed-loop system is needed. A feedback actuator is a type of linear actuator that incorporates positional feedback. Feedback Potentiometerįeedback actuator and potentiometer make up the phrase feedback potentiometer. We can actually program a servo to go to a specified position using an Arduino. Most servo motors have a rotational range of 0-180 degrees and provide a location/angle feedback loop. A servo is a device that uses feedback to achieve the desired result. During this time, the motor receives the desired position from the pulse width, and the actual shaft position is fed back to the circuit via the potentiometer. The incoming pulse is measured, which then applies current to the motor to turn the shaft until the potentiometer indicates that the position corresponds to the incoming pulse width. Using a potentiometer attached to the rotating shaft, servos sense position. ![]() The servo circuitry is built right inside the motor unit and has a positionable shaft, usually fitted with a gear and a control arm. As the motor rotates, the potentiometer’s resistance changes, and with this, the control circuit can precisely regulate the movement. Inside a servo, there is typically a small DC motor, a potentiometer, and a control circuit. DC servos are not designed for high currents, so they are usually used for low power applications. ![]() An AC servo can handle higher currents, so they’re typically used in industrial machinery. There are two types of servo motors – AC and DC. ![]()
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