Normally Ball Bearing is used on one side and Roller Bearing is used on other side in Medium Size AC Machine. As Load increases, Roller Bearing is also provided along with Ball Bearing. Radial Bearing takes Radial Load and Ball Bearing takes Axial Load only.
In Medium Size Vertical Motor, Angular Contact Ball Bearing is used in place of Deep Groove Ball Bearing.
cos (fi) vs Field Current is in the shape of Inverted V and hence called Inverted V Curve.
Hollow Steel Pipes are used to increase Rigidity of Stator Frame.
Super Conducting Generators have high Efficiency due to low Copper Loss. They use Super Conductors in Winding. Super Conductors have extremely high Conductivity at low Temperature.
