As a result of this, they are more expensive than common DC motors. The result, however, is a small and strong motor that is perfect for driving small robots. D eciding on a wheel configuration . Each of these wheels is then driven independently by its own motor. By slowing down or reversing one of the motors, the robot is able to steer.
Balance is achieved by placing casters or sliders at the front and back of the chassis.
We liked the maneuverability of this design and it was the one we used on our mouse. In this design, the two rear wheels are connected to a common axle and driven by one motor. Reversing this motor causes the mouse to reverse. Turning is achieved by using a second motor, usually a servo, which steers the front wheel. An alternative is to slip treads over the wheels so that it winds up looking like a tank.