Shaded-pole motors are the original type of single-phase AC induction motor. They have a copper ring surrounding part of each pole that creates an out of phase magnetic field, causing rotation. Shaded-pole motors have low starting torque, low efficiency, and are used for small, low-power applications like fans and blowers where high torque isn't needed. Common applications include small fans and blowers in devices like air conditioners, exhaust fans, hair dryers, and small appliances.