Audionote iq3 alnico magnet driver#

Blackburn designed Altec 801 field-coil compression driver was modified by John Hilliard with a permanent AlNiCo 5 magnet replacing the. They are manufactured in different ways and have different finished magnetic properties. They retain approximately 85 of room-temperature magnetization at temperatures of up to 1,000☏. 'During the Second World War AlNiCo 5 magnets were perfected for military applications, and Altec’s John Hilliard adapted AlNiCo 5 magnets to loudspeaker drivers.' 'Shortly after the war, the Dr. They have the highest operating temperature and temperature stability of any permanent magnetic material. Stronger anisotropic alnico has a fixed DoM axis. Alnico magnets are alloys comprised of aluminum, nickel, iron, and cobalt. Weaker Isotropic alnico takes complex magnetic fields.

Keeping within normal grades is advised but bespoke Alnico magnets are available. Alnico produced to specific Br, Hc, Hci and BHmax may be possible but at extra cost. It is common for the magnet pole faces to be machined to finish. Alnico5, Alnico 8 and Alnico 9 all exist with several sub-grades with differing performance characteristics. Cast Alnico 5 is the most common grade of Alnico, with the LNG44 variant of Alnico 5 (Alcomax 3) being the most popular. Isotropic magnets can be magnetised in many ways as they have no preferred direction of magnetisation but give reduced performance. Anisotropic magnets have the direction of magnetisation (DoM) permanently within the structure and give the maximum performance. Sintered Alnico magnets are not so commonly used due to lower magnetic performance and limitation to simpler shapes. Casting Alnico is cost effective for both low and high volume, for small and very large magnets. Casting is often used to get “near net shape” Alnico magnets. Cast Alnico is the most common form of Alnico magnet. They can be produced by Casting or Sintering. Alnico magnets should be regarded as the best choice in extremely high temperature applications. They are an alloy of Aluminium, Nickel and Cobalt hence the term Al-Ni-Co. They are also somethimes shown as Alcomax, Columax, Hycomax and Ticonal brands.Īlnico magnets have the best temperature coefficients of any magnet material. Alnico magnets are a best choice in extremely high temperature applications.Īlnico magnets are Cast or Sintered. AlNiCo 2 is slightly more permeable than AlNICo 5 (but still way less permeable than steel), leading to a pickup with slightly higher inductance and a softer, rounder sound with more attenuated highs compared to AlNICo 5.

Alnico magnets have the best temperature coefficients of any magnet material.