Book Details :
LanguageEnglish
Pages338
FormatPDF
Size5.4 MB

# Electric Machinery and Power System Fundamentals

Electric Machinery and Power System Fundamentals Solutions Manual by Stephen Chapman | PDF Free Download.

## Preface to Electric Machinery and Power System

This Instructor’s Manual is intended to accompany the third edition of Electric Machinery and Power System Fundamentals.

To make this manual easier to use, it has been made self-contained. Both the original problem statement and the problem solution are given for each problem in the book.

This structure should make it easier to copy pages from the manual for posting after problems have been assigned.

Many of the problems in Chapters 2, 5, 6, and 9 require that a student read one or more values from a magnetization curve.

The required curves are given within the textbook, but they are shown with relatively few vertical and horizontal lines so that they will not appear too cluttered.

Electronic copies of the corresponding open-circuit characteristics, short-circuit characteristics, and magnetization curves as also supplied with the book.

They are supplied in two forms, as MATLAB MAT-files and as ASCII text files. Students can use these files for electronic solutions to homework problems.

The ASCII files are supplied so that the information can be used with non-MATLAB software.

The solutions in this manual have been checked carefully, but inevitably some errors will have slipped through.

If you locate errors which you would like to see corrected, please feel free to contact me at the address shown below, or at my email address [email protected]

I greatly appreciate your input! My physical and email addresses may change from time to time, but my contact details will always be available at the book’s Web site,

which is http://www.mhhe.com/engcs/electrical/chapman/. A core with three legs is shown in Figure P1-5. Its depth is 5 cm, and there are 200 turns on the leftmost leg.

The relative permeability of the core can be assumed to be 1500 and constant. What flux exists in each of the three legs of the core?

What is the flux density in each of the legs? Assume a 4% increase in the effective area of the air gap due to fringing effects.

SOLUTION This core can be divided up into four regions. Let R1 be the reluctance of the left-hand portion of the core,

R2 be the reluctance of the center leg of the core, R3 be the reluctance of the center air gap, and R4 be the reluctance of the right-hand portion of the core.

SOLUTION The induced voltage on this wire can be calculated from the equation shown below.

The total voltage is zero, because the vector quantity v ×B points into the page, while the wire runs in the plane of the page.

The core shown in Figure P1-4 is made of a steel whose magnetization curve is shown in Figure P1-9.

Repeat Problem 1-7, but this time do not assume a constant value of µr.

How much flux is produced in the core by the currents specified? What is the relative permeability of this core under these conditions?