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Fundamentals of Permanent Magnets

Fundamentals of Permanent Magnets

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Fundamentals of Permanent Magnets

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  1. Fundamentals of Permanent Magnets Alliance LLC

  2. 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 Property of Alliance LLC

  3. 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 Property of Alliance LLC

  4. Main Types of Magnet Materials • Alnico • Ferrite • Samarium Cobalt • Neodymium Iron Boron • Bonded Grades of the Above Types Property of Alliance LLC

  5. Typical Supplier Data Sheet Property of Alliance LLC

  6. Hysteresis / Demagnetization Curve Property of Alliance LLC

  7. (BiH)max +B I Br, Bi I Hci Hc -H +H -B Property of Alliance LLC

  8. Temperature Effects Property of Alliance LLC

  9. 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) Property of Alliance LLC

  10. Magnet Characteristics Property of Alliance LLC

  11. Cast Alnico Magnets Property of Alliance LLC

  12. Ferrites / Ceramics (SrFe2O3) Property of Alliance LLC

  13. Neodymium, Neo, NdFeB Property of Alliance LLC

  14. Injection and Compression Molded Property of Alliance LLC