Servo motors are typically employed in closed-loop position control; for example let us consider the following application, where the angular position of the output shaft is intended to follow the reference voltage (ϴref).
The potentiometer mounted on the output shaft provides a feedback voltage proportional to the actual position of the output shaft. The voltage from this potentiometer must be a linear function of angle, and must not vary with temperature; else the accuracy of the system will be affected.
The feedback voltage – representing the actual angle of the shaft, is subtracted from the reference voltage – representing the desired position and the resulting position error signal is amplified and used to drive the motor so as to rotate the output shaft in the desired direction. When the output shaft reaches the target position, the position error becomes zero, no voltage is applied to the motor, and the output shaft remains at rest. Any effort to physically move the output shaft from its target position immediately creates a position error and a restoring torque is applied by the motor.
Related: How Servo Motors are used in Process Control
The tachometer feedback is used in addition to the main position feedback to help improve the dynamic performance of the system.
Industrial measurement and control processes employ standard process signals that are used throughout all the…
The integration of advanced technologies in security systems has become imperative for ensuring safety and…
Power quality may be affected by a number of issues. Our discussion in this article…
Power quality has become an important issue to electricity consumers at all levels of consumption.…
The importance of printed circuit board (PCB) technology has escalated throughout the years with the…
One of the key challenges in measuring the electrical current in high voltage, high power…
