Alnico Magnets

AlNiCo,  Alnico Magnets, Casting & Sintered AlNiCo Permanent Magnets

Alnico was developed in the early 1930’s. During World War II it was used in military electronic applications. After the war it quickly spread into civilian versions of those applications and replaced magnet steel in many applications. High induction levels with good resistance to demagnetization and stability, due to its low temperature coefficient (0.02% / °C), at a reasonable cost made Alnico the magnet material of choice.

Alnico-Magnets

Alnico-Magnets

A high working temperature limit (550 °C / 1020 °F) makes Alnico especially well suited for sensitive automotive and aircraft sensor applications. Alnico is produced in many grades to fit the requirements of these applications, from Alnico 1 to Alnico 12, but the most popular grades are 2, 5 and 8. By comparison to newer materials, the coercivity of Alnico is low.

Where Alnico is appropriate, magnet size can be minimized if it can be magnetized after assembly into the magnetic circuit. If used independent of other circuit components, as in security applications, the effective length to diameter ratio (related to the permeance coefficient) must be great enough to cause the magnet to work above the knee in its second quadrant demagnetization curve. For critical applications, Alnico magnets may be calibrated to an established reference flux density value. A by-product of low coercivity is sensitivity to demagnetizing effects due to external magnetic fields, shock, and application temperatures. For critical applications, Alnico magnets can be temperature stabilized to minimize these effects.

Alnico magnet material is made by alloying aluminum, nickel and cobalt with iron. Some grades also contain copper and/or titanium. The alloying process is casting or sintering. The process and the heat treatment needed to optimize magnetic properties produces hard (Rc45) and brittle parts that are best shaped or finished by abrasive grinding. Cast parts are generally under 70 pounds and may be used as-is, but polar surfaces are usually ground flat and parallel. Sintering is confined to high volume parts in sizes under one cubic inch and an effective press length to diameter ratio under four.

Alnico-Gussmagnet

Alnico-Gussmagnet

To minimize the volume of magnet material required by an application, the entire magnetic circuit must be considered. An optimized circuit design results in a circuit permeance coefficient that causes the magnet to operate above the knee of its demagnetization curve by a margin large enough to offset anticipated operating demagnetizing effects. Optimized steel components result in an effective magnetic length greater than the magnet itself, but this is only effective if the magnet can be magnetized after assembly into the circuit. The alternate is to design the magnet shape to produce a load line, on its own, that intersects the BH curve above its knee, so minimal flux is lost due to the self demagnetizing factor upon removal from the magnetizing fixture. In either case, a magnetizing force of 3.0 kOe must be applied to Alnico 5 magnets and 7.0 kOe for Alnico 8. When magnetized in a magnetic circuit, the magnetizing pulse must be wide enough to allow eddy currents in the steel to decay before dropping below these values.

AlNiCo Multi Pole Rotor Magnet

AlNiCo Multi Pole Rotor Magnet

AlNiCo Multi Pole Rotor Magnet, 8-Poles Cast AlNiCo Rotor Permanent Magnet, Rotor Magnets, Multi-Poles AlNiCo Magnets for Rotor, 8-POLE Alnico rotor shaped magnet, Sintered Alnico Cylindrical style Rotor Magnet, Cast Alnico Permanent Magnet, customer alnico rotor magnet China factory 8-Poles Cast AlNiCo Multi Pole Rotor Magnet  Part No.  HSARM-8 SERIES Size: 2.200″ Dia. x 1.350″ […]

8-Poles Cast AlNiCo Rotor Permanent Magnet

8-Poles Cast AlNiCo Rotor Permanent Magnet

8-Poles Cast AlNiCo Rotor Permanent Magnet, Rotor Magnets, Multi-Poles AlNiCo Magnets for Rotor, 8-POLE Alnico rotor shaped magnet, Sinter and Cast Alnico Cylindrical Magnet, Cast Alnico Permanent Magnet, Multi Polar Alnico Magnetic Rotor Core, custom alnico rotor magnet China factory 8-Poles Cast AlNiCo Rotor Permanent Magnet Part No.  HSARM-8 SERIES Size: 2.000″ Dia. x 1.250″ […]

6-Poles Cast AlNiCo Multi-pole Rotor Magnet

6-Poles Cast AlNiCo Multi-pole Rotor Magnet

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Rotor AlNiCo Magnet 4-Poles

Rotor AlNiCo Magnet 4-Poles

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2-Poles AlNiCo Rotor Magnet

2-Poles AlNiCo Rotor Magnet

2-Poles AlNiCo Rotor Magnet, Multi-Poles Magnets for AlNiCo Rotor, Cast Alnico Cylindrical Magnet Rotor System, Multi Polar Alnico Magnetic Rotor Core, alnico rotor magnet China supplier 2-Poles AlNiCo Rotor Magnet Part No.  HSARM-2 series Standard Size: 0.437″ Dia. x 0.437″, 0.625″ Dia. x 0.625″, 0.875″ Dia. x 1.000″, 1.250″ Dia. x 0.750″, 1.250″ Dia. x […]

Multi-Poles Magnets AlNiCo Rotor Assemblies

Multi-Poles Magnets AlNiCo Rotor Assemblies

Multi-Poles Magnets AlNiCo Rotor Assemblies, Cast Alnico Cylindrical Magnet Rotor System, Alnico rotor with protected brass sleeve and potted with epoxy, Multi Polar Alnico Magnetic Rotor Assemblies, alnico rotor magnet China supplier Multi-Poles Magnets AlNiCo Rotor Assemblies with protected brass sleeve and potted with epoxy Part No.  HSMUR series Features • Alnico rotor magnets are […]

Multi-Pole AlNiCo Magnet Assemblies for Rotor

Multi-Pole AlNiCo Magnet Assemblies for Rotor

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Multi-Pole Magnetic Rotor AlNiCo

Multi-Pole Magnetic Rotor AlNiCo

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Multi-Pole Insulated Magnet

Multi-Pole Insulated Magnet

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Customer Shape AlNiCo Magnets

Customer Shape AlNiCo Magnets

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ABS Wheel Speed Sensor Magnets

ABS Wheel Speed Sensor Magnets

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Alnico Sensor Magnets

Alnico Sensor Magnets

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Sintered Alnico Speedometer Sensor Magnet

Sintered Alnico Speedometer Sensor Magnet

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Permanent Magnet Bar AlNiCo

Permanent Magnet Bar AlNiCo

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Rod AlNiCo Permanent Magnet

Rod AlNiCo Permanent Magnet

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Permanent Magnet Rod AlNiCo

Permanent Magnet Rod AlNiCo

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Alnico 5 Channel Magnet

Casting Alnico 5 Channel Magnet

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Rectangular Channel Alnico Magnet

Rectangular Channel Alnico Magnet

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Cast Alnico Channel Magnet

Cast Alnico Channel Magnet

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Rectangle Alnico Channel Magnet

Rectangle Alnico Channel Magnet

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