What type of signal do closed loop speed controllers utilize to adjust motor speed?

Closed loop speed controllers utilize a feedback signal to adjust motor speed effectively. In a closed loop control system, the actual output (in this case, the motor speed) is continuously monitored and compared to the desired setpoint. The feedback signal provides real-time information about the current speed of the motor back to the controller.

This process allows the system to make precise adjustments in order to maintain the motor speed at the desired level despite variations in load or other changing conditions. By using the feedback from the motor's performance, the controller can modify the input signal accordingly, ensuring optimal and stable operation.

In contrast, while control signals may be used to initiate changes, they do not provide the necessary information about the current state of operation, and thus cannot ensure the ongoing performance adjustments that feedback signals facilitate. A threshold signal typically indicates a specific limit or point of operation rather than adjusting speed, while a power signal relates more to the energy supplied to the motor rather than feedback for speed adjustments.