shunt motor of 75 hp and 240 V, has a voltage drop in brushes of 5 V and an armature resistance of 0.23 ohms. The field resistance is 200 ohms. At no load the motor draws 20 A and has a speed of 2500 rpm. Calculate: a).-The speed of the motor at nominal current if this has an efficiency of 85%. b) - The motor speed at full load if the field current is increased to 1.56 amperes and is on the linear part of the magnetization curve. c).-The torque developed at full load in Nm d).-The torque developed at half load in lb-ft. e).- the torque delivered by the motor at full load.
shunt motor of 75 hp and 240 V, has a voltage drop in brushes of 5 V and an armature resistance of 0.23 ohms. The field resistance is 200 ohms. At no load the motor draws 20 A and has a speed of 2500 rpm. Calculate: a).-The speed of the motor at nominal current if this has an efficiency of 85%. b) - The motor speed at full load if the field current is increased to 1.56 amperes and is on the linear part of the magnetization curve. c).-The torque developed at full load in Nm d).-The torque developed at half load in lb-ft. e).- the torque delivered by the motor at full load.
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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A shunt motor of 75 hp and 240 V, has a voltage drop in brushes of 5 V and an armature resistance of 0.23 ohms. The field resistance is 200 ohms. At no load the motor draws 20 A and has a speed of 2500 rpm. Calculate:
a).-The speed of the motor at nominal current if this has an efficiency of 85%.
b) - The motor speed at full load if the field current is increased to 1.56 amperes and is on the linear part of the magnetization curve.
c).-The torque developed at full load in Nm
d).-The torque developed at half load in lb-ft.
e).- the torque delivered by the motor at full load.
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