Resolver
Resolver an electric machine that is used to provide information about the position of a motor-driven system. The shaft of the resolver is connected to the main motor either directly or through gears. The rotor contains a single winding, while the stator typically contains two windings in quadrature. One stator winding and the rotor winding are ex- cited, while the remaining stator winding is shorted. When the resolver is rotated by the main motor, voltages are produced in the stator windings that can be used to determine the position. For multi-turn systems, two resolvers (coarse and fine) may be required.
Source: http://ee.sharif.edu/~lcsl/useful/Electrical%20Engineering%20Dictionary.pdf
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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000
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