240-volt self-excited shunt DC motor has field resistance Rf=200ohms and armature resistances Ra=0.25ohms. No-load: Motor is runing with 240V DC souce with no load driven. Runs 1800 rpm and draws 720 watts from the source. Full-load: Motor is runing with 240V DC souce while driving rated load. Runs 1700rpm and draws 6400 watts. Neglect: saturation and rotational power losses. 1. What is power in armature at full-load 2. What is horsepower rating of motor 3. what is output torque 4. whats is starting line current drawn at rated conditions 5. What resistance should be inserted in series with armature circuit to limit the starting armature current to 200% or less of the rated value

240-volt self-excited shunt DC motor has field resistance Rf=200ohms and armature resistances Ra=0.25ohms. No-load: Motor is runing with 240V DC souce with no load driven. Runs 1800 rpm and draws 720 watts from the source. Full-load: Motor is runing with 240V DC souce while driving rated load. Runs 1700rpm and draws 6400 watts. Neglect: saturation and rotational power losses. 1. What is power in armature at full-load 2. What is horsepower rating of motor 3. what is output torque 4. whats is starting line current drawn at rated conditions 5. What resistance should be inserted in series with armature circuit to limit the starting armature current to 200% or less of the rated value

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.4P

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Concept explainers

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.

Question

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A 240-volt self-excited shunt DC motor has field resistance R_f=200ohms and armature resistances R_a=0.25ohms.

No-load: Motor is runing with 240V DC souce with no load driven. Runs 1800 rpm and draws 720 watts from the source.
Full-load: Motor is runing with 240V DC souce while driving rated load. Runs 1700rpm and draws 6400 watts.

Neglect: saturation and rotational power losses.

1. What is power in armature at full-load

2. What is horsepower rating of motor

3. what is output torque

4. whats is starting line current drawn at rated conditions

5. What resistance should be inserted in series with armature circuit to limit the starting armature current to 200% or less of the rated value

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