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Introduction to Potentiometer Angle Sensors
Potentiometer-based displacement sensor
It converts mechanical displacement into a resistance or voltage output that has a linear or arbitrary functional relationship with it through the potentiometer element. Ordinary linear potentiometers and rotary potentiometers can be used as linear displacement and angular displacement sensors, respectively. However, potentiometers designed for measuring displacement require a definite relationship between displacement change and resistance change. The movable brush of the potentiometer is connected to the object being measured. The displacement of the object causes a change in the resistance at the moving end of the potentiometer. The change in resistance reflects the magnitude of the displacement, while an increase or decrease in resistance indicates the direction of the displacement. Typically, a power supply voltage is applied to the potentiometer to convert the resistance change into a voltage output. Wire-wound potentiometers exhibit a stepwise change in resistance as the brush moves, resulting in a stepwise output characteristic. If this type of displacement sensor is used as a displacement feedback element in a servo system, excessive step voltage can cause system oscillation. Therefore, efforts should be made to minimize the resistance value per turn in the manufacturing of potentiometers. Another major disadvantage of potentiometer-based sensors is their susceptibility to wear. Its advantages include: simple structure, large output signal, and ease of use.
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