Example (3). A wrought iron bar is 30 cm long and 2 cm in diameter is bent into a circular shape as shown in Figure below. It is then wound wit 500 turns of wire. Calculate the current required to produce a flux of 0.5 mWb in the magnetic circuit in each of the following cases: (a) The structure has no air gap and r = 4000 (assumed constant) (b) The structure has an air gap of 1 mm, and µ, = 4000 (assumed constant) (c) The structure has an air gap of 1 mm, and B-H charteristics are given in the table below. H(At/m) 2500 3000 3500 4000 B(Tesla) 1.550 1.590 1.600 1.615 500 tums le - 30 cm Aç= # x10-4 [1 mm

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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.