Two driving wheels, with a few universal wheels, turn by differential speed, like a two-wheeled balance car, but unlike a balance car, his three wheels are already balanced on a flat surface and do not need to consider the problem of self-balancing. Indoor chassis A011 has a 2-wheel differential Chassis.
His two-wheeled principle is the same as relying on the left and right sides of the speed is not the same as steering, but because his four wheels are fixed, imagine when the car differential in-situ steering, the four wheels are bound to have a little bit of drift, that is, the wheels will appear sideways sliding, and two-wheeled will not be the case because of the two-wheeled axle through the center of rotation. A020 series chassis is the 4wd robot chassis.
Like a car, the front-wheel steering and rear-wheel drive model is called the Ackerman model, and the A025 series chassis is a four-wheeled Ackerman chassis.
