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A three-phase Synchronous Motor (SM), 2 poles with 240 V, 50 kVA, 0.85 PF lagging, Y connection, 50 Hz. The synchronous reactance 2.0 Ohm, the friction and windage losses are 2.0 kW and the core losses are 1.5 kW. The motor is supplying a 10 hp and the PF of the motor is 0.85 lagging at rated voltage. Do the following: 1. Draw the phase diagram of the motor under the mentioned condition. 2. Calculate the Internal voltage EA. 3. Calculate the efficiency of the motor. 4. Let the load doubled to be 20 hp with same PF. Recalculate the efficiency of the motor.

A three-phase Synchronous Motor (SM), 2 poles with 240 V, 50 kVA, 0.85 PF lagging, Y connection, 50 Hz. The synchronous reactance 2.0 Ohm, the friction and windage losses are 2.0 kW and the core losses are 1.5 kW. The motor is supplying a 10 hp and the PF of the motor is 0.85 lagging at rated voltage. Do the following: 1. Draw the phase diagram of the motor under the mentioned condition. 2. Calculate the Internal voltage EA. 3. Calculate the efficiency of the motor. 4. Let the load doubled to be 20 hp with same PF. Recalculate the efficiency of the motor.

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 three-phase Synchronous Motor (SM), 2 poles with 240 V, 50 kVA, 0.85 PF lagging, Y connection, 50 Hz. The synchronous reactance 2.0 Ohm, the friction and windage losses are 2.0 kW and the core losses are 1.5 kW. The motor is supplying a 10 hp and the PF of the motor is 0.85 lagging at rated voltage. Do the following: 1. Draw the phase diagram of the motor under the mentioned condition. 2. Calculate the Internal voltage EA. 3. Calculate the efficiency of the motor. 4. Let the load doubled to be 20 hp with same PF. Recalculate the efficiency of the motor.
Transcribed Image Text:A three-phase Synchronous Motor (SM), 2 poles with 240 V, 50 kVA, 0.85 PF lagging, Y connection, 50 Hz. The synchronous reactance 2.0 Ohm, the friction and windage losses are 2.0 kW and the core losses are 1.5 kW. The motor is supplying a 10 hp and the PF of the motor is 0.85 lagging at rated voltage. Do the following: 1. Draw the phase diagram of the motor under the mentioned condition. 2. Calculate the Internal voltage EA. 3. Calculate the efficiency of the motor. 4. Let the load doubled to be 20 hp with same PF. Recalculate the efficiency of the motor.
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