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Single-phase Motor Stator
If TWO AC voltages, 90oE apart, are applied to TWO WINDINGS, 90oM apart, a UNIFORM ROTATING field will result.
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Capacitor Start Motor Addition of a START Winding CAPACITOR increases the phase angle between windings to approach 90o at start.
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Permanent Split Capacitor Motor
This motor is very easily reversible. However, because the windings are identical, its has relatively low efficiency, and is used mainly for reversible small motors.
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Shaded Pole Motor The Shaded Pole squirrel cage motor is used for small, low torque applications. The laminated iron core usually has a single coil, producing alternating magnetic flux.
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Shaded Pole Motor The laminated stator has slots in which SHORT-CIRCUITED copper “Shading Rings” are placed. The inductive shading rings have currents induced that are LAGGING the coil current.
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The rotor rotates TOWARDS the shading rings.
Shaded Pole Motor The small angle of lag between coil flux and shading ring flux produces a weak rotating field effect. The rotor rotates TOWARDS the shading rings.
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Universal Motor Current is passed to the armature via carbon brushes in contact with the commutator Brushes in Brush-holders
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Reversing Rotation of Single Phase Motors
Shaded Pole Motor Reversal of Shaded Pole Motor requires physical reversal of the stator and shading rings.
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