Vertical motor-bearing systems

The number one reason for the removal of vertical motors from service is the failure of the bearing system. These systems can be much more complicated than those used in horizontal motors. This article addresses various bearing configurations for definite-purpose vertical motors, along with their various accessories. Issues associated with design specifications, installation, operation, maintenance, and repairs are also addressed. The purpose of this article is to present the various bearing systems used in vertical motors and the reasons why these systems can fail prematurely. Suggestions will be given for extending the bearing life, including how to specify these bearings and their accessories correctly. The motors used in this article includes motors up to 5,000 hp, all speeds, and enclosures.