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Electrical Technology, Volume 1 by S. P. Bali

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10

Hysteresis

OBJECTIVES

In this chapter you will learn about:

  • The lagging of flux, in the core of the electromagnet, behind the magnetizing force
  • The shape and size of hysteresis loops of different magnetic materials and its influence on their performance
  • Problems on calculation of hysteresis loop
  • Eddy currents: their origin and minimization
  • Eddy current losses and their contribution to core loss
  • Calculation of eddy current loss and hysteresis loss
  • Separation of hysteresis loss and eddy current loss from core loss
  • Problems on separation of losses
  • Plotting core losses
  • The significance of the contour of the B-H curve
  • Residual magnetism, remanence, coercive force, coercivity, retentivity, etc.
  • The influence of the thickness of laminations

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