Motor bearing systems for forest products applications

Numerous bearing systems are used in the electric motor industry. These systems even vary for a given manufacturer based upon the motor size, type, enclosure, speed and application. This paper focuses on anti-friction rolling element, grease or oil lubricated bearings used in both vertical and horizontal motors. The primary focus is on industrial applications that use the more traditional types of bearings, lubricating systems and enclosures. It is acknowledged that there are other specialized bearings in operation and that there are other types of machinery where the principles of the paper may have application. A comparison is made between the different types of bearing systems available. Loading, speed, coupling and life factors are considered. The various methods of lubrication, sealing, mounting, and clamping are reviewed. Recommendations are given for a wide variety of industrial applications.