The design and analysis of a novel motor and bearing assembly for a polygonal laser scanner are discussed. Static and dynamic characteristics of this assembly are investigated. A detailed analysis of bearing stiffness and load capacity at various rotational speeds is presented. The analysis also treats the dependence of magnitude and phase angle of the bearing reaction on the frequency of motion. The criterion for a relative transverse and angular oscillatory motion stability of the bearing surface is discussed. The analysis is compared with experimental results from a prototype.