The article deals with control of a robot with three omni-wheels. The feature of this robot is the triangular platform with a right angle. The steering function is of special interest of the paper. The explicit formulae of moments applied to the wheels are obtained for the robot's movement along a specified trajectory for two particular cases. The first is forward motion, when the robot does not turn during the movement. The second is the tangential movement to the selected curvilinear trajectory, when the robot rotates according to the curvature of the trajectory. The purpose of the study is as follows. A group of described robots can implement a transport system with a different configuration of a common transport platform, for this, the robots connecte by the sides (ribs) of their bodies. In order to form a common platform - for example, a rectangle, or a rhombus, and it is required that the body of the robot agent has a right angle. We note here that, from a general point of view, the problem of connecting triangles to a common given figure (corresponding to transporting thing) is the task of tiling the plane, or part of the plane, with a repeating "pattern" [9], which is also called the tessellation, packing or the problem of parquet (see also [9, 10]). It is known that for triangular tiles this problem has a solution.