Ratio: Slot opening gap length Carter's coefficient 1 2 0.15 0.28 3 3.4 4 0.37 0.41 0.43
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.
Determine the m.m.f. required for the airgap of a machine with open slots from the following particulars :
Slot pitch 4.3 cm
Slot opening = 2.1 cm
Gross length of core = 48 cm
Pole arc =18 cm
Airgap length = 0.6 cm
Flux per pole = 0.056 wb
No. Of ventilating ducts=8
Width of each ventilating duct=1.2 cm
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