45) A 40hp, 440V, four pole dc motor has an armature wave-wound with 846 conductors and the commutator has 141 segments. The full load efficiency is 85% and the shunt current is 1.25A. If the brushes are shifted backward through segments from the geometric neutral axis, calculate (a) The demagnetizing ampere-turns per pole (b) The distorting ampere-turns per pole on full load.

45) A 40hp, 440V, four pole dc motor has an armature wave-wound with 846 conductors and the commutator has 141 segments. The full load efficiency is 85% and the shunt current is 1.25A. If the brushes are shifted backward through segments from the geometric neutral axis, calculate (a) The demagnetizing ampere-turns per pole (b) The distorting ampere-turns per pole on full load.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter32: Three-phase Motors

Section: Chapter Questions

Problem 6RQ: Name three factors that determine the torque produced by an induction motor.

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