Lower initial cost and easier installation are two advantages of a(n) ? motor control system.

• A. Open-loop
• B. Closed-loop
• C. Vector
• D. Servo

Answer: (A)

Open-loop motor control systems operate without feedback. A command is sent to the motor and the system assumes the motor will follow that command exactly, with no sensors feeding back actual speed or position to correct errors. Because there are no feedback components (like encoders or tachometers) and no need to tune a control loop, the hardware is simpler, wiring is lighter, and installation is quicker and cheaper. This is why the initial cost is lower and setup is easier compared with systems that rely on feedback.

The tradeoff is that performance can drift when loads change or there are disturbances, since there’s no automatic correction. In contrast, closed-loop, vector, and servo systems use sensors and feedback to continuously adjust operation, delivering higher accuracy and reliability at a higher cost and with more complex installation.