ABSTRACT
A rotating electric machine typically consists of a hollow cylindrical static structure and a rotating cylinder mounted on bearings and placed inside the hollow of the static structure. Both the static and the rotating members are made of laminated steel and they carry current carrying copper or aluminum conductors for the production of torque or voltage and conversion of electric energy to mechanical energy and vice versa. Electric fault diagnosis often requires analysis of harmonics in machine line current, flux, torque, and speed. Describing electric machines as group coupled magnetic circuits provides another way of obtaining their operating characteristics. The circuit elements are usually resistances and inductances. The winding and modified winding function approach provides the necessary tool to compute these inductances. It provides a very computationally efficient way to estimate inductances from the machine winding and the air-gap data.
