A 300-hp, 440-V, 560-A, 863 r/min shunt dc motor has been tested, and the following data were taken: Blocked-rotor test: VA = 16.3 V exclusive of brushes VF = 440 V I A = 500 A IF = 8.86 A No-load operation: VA = 16.3 V including brushes IF = 8.76 A I A = 23.1 A n = 863 r/min What is this motor’s efficiency at the rated conditions? [Note: Assume that (1) the brush voltage drop is 2 V; (2) the core loss is to be determined at an armature voltage equal to the armature voltage under full load; and (3) stray load losses are 1 percent of full load.]
A 300-hp, 440-V, 560-A, 863 r/min shunt dc motor has been tested, and the following data were taken: Blocked-rotor test: VA = 16.3 V exclusive of brushes VF = 440 V I A = 500 A IF = 8.86 A No-load operation: VA = 16.3 V including brushes IF = 8.76 A I A = 23.1 A n = 863 r/min What is this motor’s efficiency at the rated conditions? [Note: Assume that (1) the brush voltage drop is 2 V; (2) the core loss is to be determined at an armature voltage equal to the armature voltage under full load; and (3) stray load losses are 1 percent of 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 300-hp, 440-V, 560-A, 863 r/min shunt dc motor has been tested, and the following data were taken:
Blocked-rotor test:
VA = 16.3 V exclusive of brushes VF = 440 V
I A = 500 A IF = 8.86 A
No-load operation:
VA = 16.3 V including brushes IF = 8.76 A
I A = 23.1 A n = 863 r/min
What is this motor’s efficiency at the rated conditions?
[Note: Assume that (1) the brush voltage drop is 2 V; (2) the core loss is to be determined at an armature voltage equal to the armature voltage under full load; and (3) stray load losses are 1 percent of full load.]
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