How a servo motor holds its position
In short: A servo compares the measured position of its shaft with the desired position and turns the motor to reduce the error.
1. The controller is given the desired position for the output shaft. 2. A sensor measures the position of the shaft. 3. The controller compares the measured and desired positions: an error signal. 4. The error makes the motor turn the shaft in the direction that reduces the error. 5. When the error reaches zero the motor stops and the shaft holds its position.
Sources: Wikipedia, “Servomotor (Wikipedia)” (CC BY-SA 4.0). Illustrative, not to scale.
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Sources
- Source: Wikipedia: Servomotor (Wikipedia) · CC BY-SA 4.0
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