Side flange-mounted bearings – EF type
The integrated side flange on the housing permits the bearing to be installed directly on the nameplate. The surfaces of the housing are optimally finned for excellent, natural cooling characteristics. The EF type is especially suitable for electric machines which do not have their own bearing foundations or the alignment work that goes with them. However, the nameplates must be torsion-resistant and able to absorb the bearing loads. Significantly shorter bearing clearances, and therefore more rigid rotor constructions in comparison to pedestal bearings. Self-adjusting, floating labyrinth seals are standard fitted to seal the shafts on the concealed side of the machine. We recommend using chamber seals in cases where there is an increased circulation of lubricant, or due to unique specifications. Access through the interior of the machine must be provided for to enable assemble and adjustment of these seals. Thanks to the numerous advantages it offers, the EF type is the most popular design for electrical machines. Side flange-mounted bearings of the type EF are less suitable for machines with sensitive rotordynamic characteristics and/or rotors with supercritical speeds. In this case, the ER, EG, and EM housing versions offer more advantageous conditions.