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Motion control systems typically require a sensor in a feedback loop to ensure that the moving member or component reaches its commanded position.sensors are typically used on machine-tool controls, elevators encoder, liquid-level assemblies, forklift trucks, automobile throttle controls, and numerous other applications. Position sensors measure either absolute or incremental displacement sensor, and are made with a variety of different materials. Also, when the sensor’s power fails, some retain the measured position data, and other types lose the information.conductive-plastic film materials. Some types of potentiometers connect to the moving member through a rigid or flexible coupling while others are actuated with a string wrapped around its output shaft. Yet other position sensors include LVDT’s (linear variable differential transformers), sonically operated devices, and digital encoders.

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