Omni Wheels, also known as Poly Wheels, are similar to Mecanum Wheels in that they are able to move in any direction. They are conventional wheels with small rollers mounted around their circumference; these rollers allow them to slide laterally with ease. Omni Wheels can either roll like a normal wheel or roll sideways using the rollers. When the wheels are driven their rubber rollers offer superior grip.
They are ideally suited for use in robotics, trolleys, transfer conveyors, shipping carts, luggage and many other applications. Omni wheels will also perform well when integrated with traditional wheels. For example, you can use two traditional wheels on a centre axle and four Omni Wheels on the front and rear axles to build a six wheel vehicle. Omni wheels can move and rotate, allowing for precise direction control and tracking and making turns as quick as possible. Omni Wheels require no lubrication or field maintenance and mounting options are very simple and stable.
Omni wheels can generally be divided into 2 types: single plate and double plate. Single plate omni wheels have a single plate of passive rollers, while double plate omni wheels have two plates of passive rollers that are rotated slightly with respect to each other. Compared to single plate omni wheels, double plate omni wheels have the advantage of having no dead areas between rollers.