6.46 for a round-frame shaded-pole motor and Fig. There are two typical configurations of shaded pole motors, round-frame and C-frame. The rotating field draws the rotor from the main pole toward the shading pole. If there were no shading coil on the salient pole, the flux in that pole and in the air gap under it would simply alternate from north to south, and no rotation would be produced. The time cycle behind the flux in the main part of the pole, causing the points of maximum flux to progress around the motor, resulting in a rather poor rotating field which draws the rotor around with it, as in any induction motor. The theory behind the shaded-pole motor is that the shading coil causes the flux in that portion of the pole to lag a small fraction of In the 1890s it was discovered that a squirrel-cage motor with a salient-pole single-phase field will run if a portion of the pole is short-circuited with a winding or coil (Trickey, 1936). The shading band acts as an auxiliary winding in this type of induction motor. Shaded-pole motors generally consist of a squirrel-cage rotor inside a stator which contains a shading band.
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