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Electrical Technology, Vol2: Machines and Measurements, 1/e by S. P. Bali

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34

Efficiency of Direct Current Machinery

OBJECTIVES

In this chapter you will learn about:

  • The fixed and variable losses in electric machines (d.c.)
  • Relationships between losses
  • Efficiency of electric machines (d.c.)
  • Simple problems on the above
equation

Efficiency

34.1  INTRODUCTION

The efficiency of any device or process is simply a ratio of its useful output to its gross input. The output and input must be measured in the same units. Since the operation of any device requires energy in order to produce its desired output and furthermore, since the amount of energy lost in a process is inversely related to its efficiency, the shortage (worldwide) ...

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