Field
Embodiments described herein generally relate to methods and devices for self-calibration of an actuator. More specifically, embodiments described herein relate to methods and devices for self-calibration of a linear actuator configured to control a spring return valve with variable stroke.
Background
Calibration of an actuator ensures proper operation and optimal performance. One approach is to use mechanical switches to detect stroke limits. Due to the mechanical contact, the accuracy, stability, and reliability of such systems may be significantly compromised. Furthermore, the mechanical switches take up additional space.
Another approach is to use resistors as current sensors for signal detection of motor power lines. However, due to variation in current flow, the accuracy and reliability of such sensor systems may be adversely affected. Furthermore, the sensing resistor results in poor system efficiency, resulting in using a larger actuator for the same application because the resistance must be large enough for sufficient signal sensing.