A 3-phase slip ring motor gives a reading of 35 V across slip rings on open circuit when at standstill with normal stator voltage applied. The rotor is star-connected and has impedance of (0.7+j5) Q per phase. Find the rotor current and p.f. when the machine is (i) at standstill with slip rings joined to a star connected starter with a phase impedance of (4+j3) 2 and (ii) when running normally with a 5% slip.

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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.