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A shunt motor has lap-wound armature with 100 slots with 2 turns per coil. It is rotating at 100rpm. Flux per pole is 100mWb. Armature resistance is 12 and field resistance is 9092. Output mechanical power is 200W. (1) Draw the circuit diagram and determine the efficiency of the motor. Ignore all friction and iron losses (ii) If motor in is slowed down using dynamic braking technique, what will be the value of the braking resistor if initial braking current is half of the starting current? What will be the initial braking power applied to the armature? Draw equivalent circuit as well.

A shunt motor has lap-wound armature with 100 slots with 2 turns per coil. It is rotating at 100rpm. Flux per pole is 100mWb. Armature resistance is 12 and field resistance is 9092. Output mechanical power is 200W. (1) Draw the circuit diagram and determine the efficiency of the motor. Ignore all friction and iron losses (ii) If motor in is slowed down using dynamic braking technique, what will be the value of the braking resistor if initial braking current is half of the starting current? What will be the initial braking power applied to the armature? Draw equivalent circuit as well.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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A shunt motor has lap-wound armature with 100 slots with 2 turns per coil. It is rotating at 100rpm. Flux per pole is 100mWb. Armature resistance is 12 and field resistance is 9092. Output mechanical power is 200W. (1) Draw the circuit diagram and determine the efficiency of the motor. Ignore all friction and iron losses (ii) If motor in is slowed down using dynamic braking technique, what will be the value of the braking resistor if initial braking current is half of the starting current? What will be the initial braking power applied to the armature? Draw equivalent circuit as well.
Transcribed Image Text:A shunt motor has lap-wound armature with 100 slots with 2 turns per coil. It is rotating at 100rpm. Flux per pole is 100mWb. Armature resistance is 12 and field resistance is 9092. Output mechanical power is 200W. (1) Draw the circuit diagram and determine the efficiency of the motor. Ignore all friction and iron losses (ii) If motor in is slowed down using dynamic braking technique, what will be the value of the braking resistor if initial braking current is half of the starting current? What will be the initial braking power applied to the armature? Draw equivalent circuit as well.
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