ABSTRACT
A shaft in an electric motor is used to transmit torque and power from the motor to an external loading machine. Because motor shafts are subjected to various combined effects of tension, compression, bending, and torsion during operation, they are typically designed for maximum stiffness and rigidity and minimum dežection to maintain shaft stress/strain below allowable limits under various loading and operating conditions. The achievement of such design objectives relies on the selection of shaft material, determinationof suitable shaft dimensions (especially shaft diameter and span between the bearings)and structures, mitigation/elimination of stress concentrations, and other design activities. Obviously, each of these can affect the long-term reliability of motor.
