Which device provides feedback voltage proportional to motor speed, used in speed control?

Master the Motor Controls Level 3 Test. Engage with flashcards and detailed multiple-choice questions, complete with hints and thorough explanations. Prepare effectively for your exam!

Multiple Choice

Which device provides feedback voltage proportional to motor speed, used in speed control?

Explanation:
In speed control, you need a signal that reflects how fast the motor is actually turning so the control system can correct any difference from the desired speed. A tachometer or tachogenerator does exactly that: it converts the shaft’s rotational speed into an electrical voltage that is proportional to rpm. That voltage can be fed into the controller as the feedback signal, allowing the system to adjust the drive to maintain the target speed. A voltmeter merely reads voltage and doesn’t inherently provide a usable feedback signal to regulate speed. An ammeter measures current, not speed, and a thermistor senses temperature, which isn’t a direct measure of rotational speed.

In speed control, you need a signal that reflects how fast the motor is actually turning so the control system can correct any difference from the desired speed. A tachometer or tachogenerator does exactly that: it converts the shaft’s rotational speed into an electrical voltage that is proportional to rpm. That voltage can be fed into the controller as the feedback signal, allowing the system to adjust the drive to maintain the target speed.

A voltmeter merely reads voltage and doesn’t inherently provide a usable feedback signal to regulate speed. An ammeter measures current, not speed, and a thermistor senses temperature, which isn’t a direct measure of rotational speed.

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