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Definition of "shaded pole" |
a magnetic pole-face in which part of the pole is encircled by a shorted conductor (usually copper). The flux through the encircled portion will be out of phase with the flux through the other portion. Shaded pole motors use the phase shift to produce a quasi-rotating magnetic field which develops a weak torque, suitable primarily for small fans. InAC relays, shaded poles are used to prevent chatter (the attempted opening and subsequent closing each time the flux passes through zero). |
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