Homework Help is Here – Start Your Trial Now!
Engineering
Electrical Engineering
Question 2. (5 points) A variable speed DC shunt machine has a rated speed of 2000 rpm and it is connected to a mechanical load that requires a constant-torque of 200 Nm. At the rated speed, the armature circuit draws 100 A. The DC supply voltage is 450 V. (b) The speed of the machine is now reduced to 1500 rpm with armature resistance control and the flux remains constant. Determine the required rheostat in the armature circuit to achieve the new speed. (c) Determine the efficiency of the machine for the condition in (b). (d) Sketch a plot that shows the relationship between the speed and the torque. Highlight the range of the required rheostat to vary the speed from 2000 rpm to 1500 rpm.

Question 2. (5 points) A variable speed DC shunt machine has a rated speed of 2000 rpm and it is connected to a mechanical load that requires a constant-torque of 200 Nm. At the rated speed, the armature circuit draws 100 A. The DC supply voltage is 450 V. (b) The speed of the machine is now reduced to 1500 rpm with armature resistance control and the flux remains constant. Determine the required rheostat in the armature circuit to achieve the new speed. (c) Determine the efficiency of the machine for the condition in (b). (d) Sketch a plot that shows the relationship between the speed and the torque. Highlight the range of the required rheostat to vary the speed from 2000 rpm to 1500 rpm.

Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter5: Resistors
Section: Chapter Questions
Problem 1PA
See similar textbooks
icon
Related questions
Question
Question 2. (5 points) A variable speed DC shunt machine has a rated speed of 2000 rpm and it is connected to a mechanical load that requires a constant-torque of 200 Nm. At the rated speed, the armature circuit draws 100 A. The DC supply voltage is 450 V. (b) The speed of the machine is now reduced to 1500 rpm with armature resistance control and the flux remains constant. Determine the required rheostat in the armature circuit to achieve the new speed. (c) Determine the efficiency of the machine for the condition in (b). (d) Sketch a plot that shows the relationship between the speed and the torque. Highlight the range of the required rheostat to vary the speed from 2000 rpm to 1500 rpm.
Transcribed Image Text:Question 2. (5 points) A variable speed DC shunt machine has a rated speed of 2000 rpm and it is connected to a mechanical load that requires a constant-torque of 200 Nm. At the rated speed, the armature circuit draws 100 A. The DC supply voltage is 450 V. (b) The speed of the machine is now reduced to 1500 rpm with armature resistance control and the flux remains constant. Determine the required rheostat in the armature circuit to achieve the new speed. (c) Determine the efficiency of the machine for the condition in (b). (d) Sketch a plot that shows the relationship between the speed and the torque. Highlight the range of the required rheostat to vary the speed from 2000 rpm to 1500 rpm.
Expert Solution
steps

Step by step

Solved in 2 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Similar questions
Recommended textbooks for you
Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:
9781337900348
Author:
Stephen L. Herman
Publisher:
Cengage Learning
SEE MORE TEXTBOOKS