When the main winding of the shaded pole motor is energized, the shaded pole winding will also generate induced current, which will make the magnetic flux of the covered part of the stator pole and the uncovered part rotate in the direction of the covered part.
A Shaded Pole motor is an AC single phase induction motor. The auxiliary winding, which is composed of a copper ring, is called a shading coil. The current in this coil delay the phase of magnetic flux in that part of the pole in order to provide a rotating magnetic field. The direction of rotation is from the unshaded side to the shaded ring.