ABSTRACT
Motors are electrical devices designed to convert electrical energy into mechanical energy. Mechanical energy is generated through the application of an electric current through a magnetic field that in turn causes a central shaft to spin and perform work. This shaft is located and held in place by two rolling element (anti-friction) bearings at either end of the motor frame and housing (very large horsepower motors may use journal bearings). These bearings are the only lubricated points on a motor and are virtually always grease lubricated.
