A 200 hp, 1500 V cumulative compound DC motor drives a load at a speed of 800 rpm and consumes 59.68 kW. If this motor has Ra = 0.075 N, R, = 750 N and Rs = 0.0025 N with fixed losses of 12 kW, determine the following: 1. The motor current, shunt field current and the armature current. 2. The back EMF (E,) and the efficiency.

A 200 hp, 1500 V cumulative compound DC motor drives a load at a speed of 800 rpm and consumes 59.68 kW. If this motor has Ra = 0.075 N, R, = 750 N and Rs = 0.0025 N with fixed losses of 12 kW, determine the following: 1. The motor current, shunt field current and the armature current. 2. The back EMF (E,) and the efficiency.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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A 200 hp, 1500 V cumulative compound DC motor drives a load at a speed of 800 rpm,
and consumes 59.68 kW. If this motor has R.
0.075 2, R, = 750 N and R, = 0.0025 N with
fixed losses of 12 kW, determine the following:
1. The motor current, shunt field current and the armature current.
2. The back EMF (E,) and the efficiency.
3. The no-load speed and the speed regulation.
4. The developed torque (use the output power to find the developed torque).
5. The starting current if the motor is started without any starters.

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