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1.9 A series motor has an armature resistance of 0.2 ohm and a series field resistance of 0.3 ohm. It is connected to a 240 V supply and at a particular load runs at 1440 r/min when drawing 15 A from the supply. Determine the following: (a) The generated Emf at this load. (b) The speed in r/min of the motor when the load is changed such that the current is increased and this causes a doubling of the flux.

1.9 A series motor has an armature resistance of 0.2 ohm and a series field resistance of 0.3 ohm. It is connected to a 240 V supply and at a particular load runs at 1440 r/min when drawing 15 A from the supply. Determine the following: (a) The generated Emf at this load. (b) The speed in r/min of the motor when the load is changed such that the current is increased and this causes a doubling of the flux.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Electrical Machines Q1.9

1.9 A series motor has an armature resistance of 0.2 ohm and a series field resistance of 0.3 ohm. It is connected to a 240 V supply and at a particular load runs at 1440 r/min when drawing 15 A from the supply. Determine the following: (a) The generated Emf at this load. (b) The speed in r/min of the motor when the load is changed such that the current is increased and this causes a doubling of the flux.
Transcribed Image Text:1.9 A series motor has an armature resistance of 0.2 ohm and a series field resistance of 0.3 ohm. It is connected to a 240 V supply and at a particular load runs at 1440 r/min when drawing 15 A from the supply. Determine the following: (a) The generated Emf at this load. (b) The speed in r/min of the motor when the load is changed such that the current is increased and this causes a doubling of the flux.
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