Robolab Technologies Pvt. Ltd. | why do we need a motor driver?

Ok, this may be a basic question, but I’m not totally sure why I need a motor controller on a geared DC motor. i.e: Let’s say I have a 18 volt DC motor that’s designed to run at 22 amps max. Why not just connect the 18-volt battery, with switch, to the motor. Turn on the switch, start motor, turn off, etc. I understand that if I needed to reduce speed, or needed any sort of variable speed control, that a controller is necessary. But if it’s as simple as on/off, do I still need one? Also, if I wanted it to run slower couldn’t I just hook up a potentiometer or a smaller battery?

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