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Fundamentals of Permanent Magnets. Magnetic Orientation . Isotropic Anisotropic (non-oriented) (oriented). Magnetic strength is the same in all directions Can be magnetized in any direction Almost all bonded magnets.

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magnetic orientation
Magnetic Orientation

Isotropic Anisotropic

(non-oriented) (oriented)

  • Magnetic strength is the
  • same in all directions
  • Can be magnetized in any
  • direction
  • Almost all bonded magnets
  • Magnetic strength is greatest
  • in the oriented direction
  • Can be magnetized only in
  • the oriented direction
  • Almost all sintered magnets

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main magnetic properties
Main Magnetic Properties
  • Residual induction - Br
  • Coercive force - Hc
  • Intrinsic coercive force - Hci
  • Maximum Energy Density – (BH)max
  • Maximum Working Temperature - Tw
  • Reversible Temperature Coefficient - -%Br/C
  • Curie Temperature - Tc

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main types of magnet materials
Main Types of Magnet Materials
  • Alnico
  • Ferrite
  • Samarium Cobalt
  • Neodymium Iron Boron
  • Bonded Grades of the Above Types

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typical supplier data sheet
Typical Supplier Data Sheet

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hysteresis demagnetization curve
Hysteresis / Demagnetization Curve

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slide7

(BiH)max

+B

I

Br, Bi

I

Hci

Hc

-H

+H

-B

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temperature effects
Temperature Effects

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slide9

15.0

13.5

12.0

10.5

9.00

7.50

6.00

4.50

3.00

1.50

B (Kg)

Alnico

Ferrite

SmCo

NdFeB(SH)

25.0 22.5 20.0 17.5 15.0 12.5 10.0 7.50 5.00 2.50 H (KOe)

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magnet characteristics
Magnet Characteristics

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cast alnico magnets
Cast Alnico Magnets

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ferrites ceramics srfe 2 o 3
Ferrites / Ceramics (SrFe2O3)

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neodymium neo ndfeb
Neodymium, Neo, NdFeB

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injection and compression molded
Injection and Compression Molded

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