phase induction motor. The auxiliary winding, which is composed of a copper ring, is called a shading coil. AC Motors Principle of Operation Resources for Engineers The shaded - pole type single - phase induction motor is one that has, in addition to the master wiring, an auxiliary short-circuited winding shifted from the master. Read here to know about the. Shaded pole motors, their constructional features, working and how they are used in starting of single phase Induction motors. Other articles where, shaded - pole motor is discussed: electric motor: Shaded - pole motors: The shaded - pole motor is provided with a main winding connected to the single - phase electric.