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Problem 1 A 2-hp, 120-V, 4-pole, three-phase, Y-connected, synchronous motor has a synchronous impedance of 0.2 + j6 22/phase. The friction and windage loss is 20 W, the core loss is 35 W, and the field-winding loss is 30W. Determine the power angle and the efficiency of the motor when it delivers the rated power at a unity power factor.

Problem 1 A 2-hp, 120-V, 4-pole, three-phase, Y-connected, synchronous motor has a synchronous impedance of 0.2 + j6 22/phase. The friction and windage loss is 20 W, the core loss is 35 W, and the field-winding loss is 30W. Determine the power angle and the efficiency of the motor when it delivers the rated power at a unity power factor.

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
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HW 2 - Problem 1

 

Problem 1 A 2-hp, 120-V, 4-pole, three-phase, Y-connected, synchronous motor has a synchronous impedance of 0.2 + j6 22/phase. The friction and windage loss is 20 W, the core loss is 35 W, and the field-winding loss is 30W. Determine the power angle and the efficiency of the motor when it delivers the rated power at a unity power factor.
Transcribed Image Text:Problem 1 A 2-hp, 120-V, 4-pole, three-phase, Y-connected, synchronous motor has a synchronous impedance of 0.2 + j6 22/phase. The friction and windage loss is 20 W, the core loss is 35 W, and the field-winding loss is 30W. Determine the power angle and the efficiency of the motor when it delivers the rated power at a unity power factor.
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