The following is the design data available for a 1250KVA, 3 Phase, 50…
Previous year question for Electrical Machine Design.
Question
The following is the design data available for a 1250KVA, 3 Phase, 50Hz , 3300 V, star connected , 300 r.p.m. alternator of salient pole type:
Stator bore D = 19 m , stator core length L = 0.335 m;
Pole arc/pole pitch = 0.66; turns per phase = 150; single layer concentric winding with 5 conductors per slot, short circuit ratio = 1.2. Assume that the distribution of gap flux is rectangular under the pole arc with zero values in the interpolar region.Calculate:
a. Specific magnetic loading.
b. Armature mmf per pole.
c. Gas density over pole arc.
d. Air gap length.
mmf required for air gap is 0.88 of no load field mmf and the gap contraction factor is 1.15.
- Year: 2022
- Subject: Electrical Machine Design