Rotor Figure P16.8 Two-phase induction motor.
Synchronous Generator
In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.
Salient Pole Rotor
Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.
Consider the two-pole two-phase induction motor having two windings displaced 90° in space shown in Figure P16.8. The fields produced by the windings are given by Ba=Kia(t) cos(θ) and Bb=Kib(t) cos(θ−90°). The two-phase source produces currents given by ia(t)=Im cos(ωt) and ib(t)=Im cos(ωt−90°). Show that the total field rotates. Determine the speed and direction of rotation. Also find the maximum flux density of the rotating field in terms of K and Im.
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