A motor controller on a robot is necessary to do what?

• A. Power supply
• B. Sensors
• C. Send control signals
• D. Diagnostics

Answer: (C)

The main idea is that the motor controller is the bridge between the robot’s brain and the motors. It takes the control commands from the robot’s control system—like desired speed and direction—and converts them into the actual drive signals the motor needs, such as PWM duty cycles or specific voltage patterns. It may also handle safety and performance features, like current limiting or soft-start, to make motor operation smooth and protected.

Think of it this way: the power supply provides the energy, sensors gather information, and diagnostics monitor health, but the motor controller is what actually makes the motors respond to the control logic. Without it, the control signals wouldn’t be translated into motor action.