There are several types of rotors used in electric motors and other applications including squirrel-cage rotors, wound rotors, salient pole rotors, and non-salient rotors. Rotors are constructed with a core and winding and function to generate a rotating magnetic field. They have a variety of applications in automotive engines, industrial refrigerators, food processing, medicine, and transporting dry materials. The characteristics of rotors depend on their specific type of construction.