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Problem 1. A 230-V shunt motor delivers 30 hp at the shaft at 1120 rpm. If the motor has an efficiency of 87% at this load, determine (a) the total input power and (b) the line current. (c) If the torque lost due to friction and windage is 7% of the shaft torque, calculate the developed torque.

Problem 1. A 230-V shunt motor delivers 30 hp at the shaft at 1120 rpm. If the motor has an efficiency of 87% at this load, determine (a) the total input power and (b) the line current. (c) If the torque lost due to friction and windage is 7% of the shaft torque, calculate the developed torque.

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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Problem 1. A 230-V shunt motor delivers 30 hp at the shaft at 1120 rpm. If the motor has an efficiency of 87% at this load, determine (a) the total input power and (b) the line current. (c) If the torque lost due to friction and windage is 7% of the shaft torque, calculate the developed torque. Problem 2. A motor is supplying 70 N-m of torque to its load. If the motor shaft is turning at 1,500 rpm, what is the mechanical power to the load in watts?
Transcribed Image Text:Problem 1. A 230-V shunt motor delivers 30 hp at the shaft at 1120 rpm. If the motor has an efficiency of 87% at this load, determine (a) the total input power and (b) the line current. (c) If the torque lost due to friction and windage is 7% of the shaft torque, calculate the developed torque. Problem 2. A motor is supplying 70 N-m of torque to its load. If the motor shaft is turning at 1,500 rpm, what is the mechanical power to the load in watts?
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