![]() Since the phase angle between the shaded and unshaded sections is small, shaded-pole motors produce only a small starting torque relative to torque at full speed. The direction of rotation is from the unshaded side to the shaded (ring) side of the pole. Currents induced in this coil by the magnetic field create a second electrical phase by delaying the phase of magnetic flux change for that pole (a shaded pole) enough to provide a 2-phase rotating magnetic field. This auxiliary single-turn winding is called a shading coil. When single phase AC supply is applied to the stator winding, due to shading provided to the poles, a rotating magnetic field is generated. A shaded-pole motor is a small squirrel-cage motor in which the auxiliary winding is composed of a copper ring or bar surrounding a portion of each pole. ![]() ![]() ![]() The shaded-pole motor is the original type of AC single-phase induction motor, dating back to at least as early as 1890. ![]()
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