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8 - Dc Machine

Published online by Cambridge University Press:  16 July 2025

S. B. Lal Seksena
Affiliation:
National Institute of Technology, Jamshedpur
Kaustuv Dasgupta
Affiliation:
West Bengal University of Technology, India
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Summary

Introduction

In the next few chapters we shall be engaged in discussions on electrical machines. An electrical machine is an ‘electro-mechanical’ rotating device. Well, is it perfect to call an electrical machine an ‘electro-mechanical’ device? Partly yes, but not exactly. We may better call it an ‘electromagnetic-mechanical’ device. Now what is it all about? A machine is a system which transforms energy. Generally, a machine transforms electrical energy of an electric circuit to a mechanical system via a magnetic circuit or vice-versa. So we can simply draw the transformation of energy in an electric machine by a single line diagram as follows:

Fig. 8.1a represents the action of a generator while Fig. 8.1b shows the action of a motor. Thus, electric machines are of two types namely generator and motor.

Well, are we absolutely right? Yes, partially but not completely. In the next chapter, this myth of machine as ‘electro-mechanical’ convertor will be destroyed. We shall see that a transformer does not really have a mechanical part and yet it is an electrical machine (static). A transformer transforms electrical energy of one electric circuit to another via a magnetic circuit.

Fig. 8.2 is showing the action of a transformer. Thus, a transformer can be called an ‘electro-magneto-electrical’ static device.

In chapter 4 we have seen that when a conducting coil is rotated in a magnetic field, an AC voltage will be induced in the coil. Similarly, if we supply AC voltage to the same coil it will show the motoring action.

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Publisher: Cambridge University Press
Print publication year: 2016

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  • Dc Machine
  • S. B. Lal Seksena, Kaustuv Dasgupta, West Bengal University of Technology, India
  • Book: Fundamentals of Electrical Engineering
  • Online publication: 16 July 2025
  • Chapter DOI: https://doi.org/10.1017/9781316134528.008
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  • Dc Machine
  • S. B. Lal Seksena, Kaustuv Dasgupta, West Bengal University of Technology, India
  • Book: Fundamentals of Electrical Engineering
  • Online publication: 16 July 2025
  • Chapter DOI: https://doi.org/10.1017/9781316134528.008
Available formats
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Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Dc Machine
  • S. B. Lal Seksena, Kaustuv Dasgupta, West Bengal University of Technology, India
  • Book: Fundamentals of Electrical Engineering
  • Online publication: 16 July 2025
  • Chapter DOI: https://doi.org/10.1017/9781316134528.008
Available formats
×