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Problem 1 A 4-pole, lap-wound de machine has 728 armature conductors. Its field winding is excited from a dc source to c
Posted: Wed Apr 27, 2022 5:51 pm
by answerhappygod
- Problem 1 A 4 Pole Lap Wound De Machine Has 728 Armature Conductors Its Field Winding Is Excited From A Dc Source To C 1 (173.98 KiB) Viewed 26 times
Problem 1 A 4-pole, lap-wound de machine has 728 armature conductors. Its field winding is excited from a dc source to create an air-gap flux of 32 mWb/pole. The machine (generator) is run from a prime mover (diesel engine) at 1600 rpm. It supplies a current of 100 A to an electric load. (a) Calculate the electromagnetic power developed. (b) What is the mechanical power that is fed from the primemover to the generator? Problem 2 = An 8 kW, 230 V, 1200 rpm dc shunt motor has Ra = 0.7 W. The field current is adjusted until, on no load with a supply of 250 V, the motor runs at 1250 rpm and draws armature current of 1.6 A. A load torque is then applied to the motor shaft, which causes the la to rise to 40 A and the speed falls to 1150 rpm. Determine the reduction in the flux per pole due to the armature reaction.