Find the following given the problem on the left: a. output torque of the motor at rated conditions b. horsepower rating of the motor c. power developed in the armature at full-load condition A 240-volt self-excited shunt DC motor has field resistance R. = 200 ohms and armature resistance R = 0.25 ohms. • No-load condition: The motor is run with a 240-volt DC source no load driven. The motor runs at 1800 RPM and draw 720 watts from the source. • Full-load condition: The motor is run with a 240-volt DC source while driving its rated load. The motor runs at 1700 RPM and draws 6400 watts. Neglect effects of saturation and assume that rotational power losses are constant for any load. Stray load losses for this motor are negligible. Answer the following questions for this machine.

Find the following given the problem on the left: a. output torque of the motor at rated conditions b. horsepower rating of the motor c. power developed in the armature at full-load condition A 240-volt self-excited shunt DC motor has field resistance R. = 200 ohms and armature resistance R = 0.25 ohms. • No-load condition: The motor is run with a 240-volt DC source no load driven. The motor runs at 1800 RPM and draw 720 watts from the source. • Full-load condition: The motor is run with a 240-volt DC source while driving its rated load. The motor runs at 1700 RPM and draws 6400 watts. Neglect effects of saturation and assume that rotational power losses are constant for any load. Stray load losses for this motor are negligible. Answer the following questions for this machine.

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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Concept explainers

Winding and Constructions

Alternating Current (AC) winding is generally of the 3-phase type due to the inherent advantages of the 3-phase machine. Armature coils must be connected to the yield balance (equivalent in magnitude and 2/3 of the series phase difference of the rod) 3-phase electromotive forces (emf). The armature should be divided into step-bands to start with slots around the perimeter.In the construction of AC machines, the frame is used as an external protective shield to protect it from environmental conditions. The frame also serves as the outer perimeter, allowing the interior to be easily placed. The static state section of the devices is the stator winding attached stator.

Question

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Find the following given the
problem on the left:
a. output torque of the motor
at rated conditions
b. horsepower rating of the
motor
c. power developed in the
armature at full-load
condition
A 240-volt self-excited shunt DC motor has field resistance R, = 200 ohms and armature resistance R = 0.25 ohms.
• No-load condition: The motor is run with a 240-volt DC source no load driven. The motor runs at 1800 RPM and draw 720 watts from
the source.
• Full-load condition: The motor is run with a 240-volt DC source while driving its rated load. The motor runs at 1700 RPM and draws
6400 watts.
Neglect effects of saturation and assume that rotational power losses are constant for any load. Stray load losses for this motor are
negligible. Answer the following questions for this machine.

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