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The two most common types of slip ring. Slip rings are made in various types and sizes; one device made for theatrical stage lighting, for example, had 100 conductors. [6] The slip ring allows for unlimited rotations of the connected object, whereas a slack cable can only be twisted a few times before it will bind up and restrict rotation.
It is based on an induction generator with a multiphase wound rotor and a multiphase slip ring assembly with brushes for access to the rotor windings. It is possible to avoid the multiphase slip ring assembly, but there are problems with efficiency, cost and size. A better alternative is a brushless wound-rotor doubly fed electric machine. [12]
Use slip rings, having greatly extended brush life over a commutator (Or completely brushless designs) The brushes in an alternator carry only DC excitation current, which is a small fraction of the current carried by the brushes of a DC generator, which carry the generator's entire output
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Its includes an auxiliary winding composed of a copper ring called a shading ring (or shading coil with more than one turn). [ 5 ] The auxiliary winding produces a secondary magnetic flux which, along with the flux from the primary coil, forms a rotating magnetic field suitable for applying torque to and rotating the rotor. [ 6 ]
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