ABSTRACT
This chapter introduces a design methodology which serves as preliminary design in industry and/or as an initial design in developing optimal design methodologies. The power of 100 kW is traditionally considered the border between small- and medium-power induction machines (IMs). In general, sub-100 kW motors use a single stator and rotor stack and a finned frame washed by air from an externally mounted at shaft end ventilator. Induction motors with power below 100 kW constitute a sizeable portion of electric motor world markets. Their design for standard or high efficiency is by a mature mixture of art and science, at least in the preoptimization stage. For most part, IM design methodologies are proprietary. The chapter presents a sample of such methodologies. For cage rotors care must be exercised in choosing the correspondence between the stator and rotor numbers of slots to reduce parasitic torque, additional losses, radial forces, noise, and vibration.
