Motor control systems that control motor speed without feedback data for torque or speed are called ? control systems.

• A. Open-loop
• B. Closed-loop
• C. Hybrid
• D. Adaptive

Answer: (A)

Open-loop control is when the speed command is sent to the motor without using any feedback from torque or speed measurements. The system relies on the input signal and the assumed model of the motor and load, so the actual speed can drift if disturbances or changes in load occur. There’s no automatic correction to keep the speed exactly as commanded.

This is different from closed-loop control, which continually compares the actual speed to the desired speed and adjusts the input to minimize error. Hybrid and adaptive controls incorporate feedback in some form or adjust their behavior based on performance, which is also not how open-loop operates. So, controlling motor speed without feedback data is characteristic of open-loop control.