Which device is not commonly used to control motors?

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Multiple Choice

Which device is not commonly used to control motors?

Explanation:
Motor control relies on sensors that provide feedback on position and speed so the controller can adjust the motor output. A limit switch acts as a physical end-stop to stop motion when a mechanism reaches a known position. An optical encoder measures rotation of a shaft, giving precise position and speed information for closed-loop control. An LVDT provides precise linear position feedback by converting displacement into an electrical signal. An altimeter, however, measures atmospheric pressure to estimate altitude and doesn’t provide direct, actionable feedback about motor position or velocity, so it isn’t routinely used to control motors.

Motor control relies on sensors that provide feedback on position and speed so the controller can adjust the motor output. A limit switch acts as a physical end-stop to stop motion when a mechanism reaches a known position. An optical encoder measures rotation of a shaft, giving precise position and speed information for closed-loop control. An LVDT provides precise linear position feedback by converting displacement into an electrical signal. An altimeter, however, measures atmospheric pressure to estimate altitude and doesn’t provide direct, actionable feedback about motor position or velocity, so it isn’t routinely used to control motors.

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