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Effect of mechanical stress on loss, permeability and magnetostriction

Effect of mechanical stress on loss, permeability and magnetostriction

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Mechanical stress can causes magnetoelastic energy to be stored in a magnetic material. When this happens the magnetic domain structure changes to minimise the total energy. This, in turn, affects all the structure sensitive magnetic properties such as losses, permeability and magnetostriction. This chapter opens with an explanation of the effect of stress on simple domain structures in iron or SiFe single crystals. This knowledge can be used to understand the practical stress sensitivity characteristics of real materials discussed in Chapters 5, 6, and 8 of Volume 2 of this book.

Chapter Contents:

  • 11.1 Effect of stress on simple magnetic domain structures
  • 11.2 Stress sensitivity derived from domain structures
  • 11.3 Effect of biaxial stress
  • 11.4 Stress sensitivity of GO steel
  • 11.5 Stress sensitivity of NO steel
  • 11.6 Effect of bending stress
  • 11.7 Effect of normal stress
  • 11.8 Effect of stress on components of loss
  • 11.9 Effects of building stresses in electrical machine cores
  • 11.9.1 Clamping stress
  • 11.9.2 Wound cores
  • 11.9.3 Stacked cores
  • 11.10 Slitting and punching stress in electrical steel
  • 11.10.1 Background
  • 11.10.2 Practical aspects of the cut edge region
  • 11.10.3 Other cutting methods
  • 11.10.4 Modelling the effect of the cut edge effect
  • 11.10.5 Shrink fitted stator cores
  • References

Inspec keywords: iron alloys; magnetic domains; silicon alloys; eddy current losses; deformation; magnetic leakage; magnetic permeability; magnetoelastic effects; magnetostriction

Other keywords: magnetic domain structure; electrical steels; mechanical stress; magnetoelastic energy; stress sensitivity characteristics; SiFe; magnetostriction; magnetic losses; permeability

Subjects: Magnetomechanical and magnetoelectric effects, magnetostriction; Magnetic domain walls and domain structure; Deformation and plasticity; Deformation, plasticity and creep; Magnetization curves, hysteresis, Barkhausen and related effects

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