Types of Magnets

Topics: Magnetic field, Magnetism, Magnet Pages: 10 (2236 words) Published: December 22, 2010
Types of Magnets

Objects having magnetic field is called as magnets. Normally magnets are of two types- Permanent magnets and Electro magnets. Permanent magnets are those magnets which occur in nature and do not depend upon external source for their magnetic field. On the other hand electromagnets are those magnets which use electric current to generate magnetic field. Classification of Magnets

There are different types of magnets with different physical and magnetic properties and strength. These magnets are used in various industrial and non industrial applications and be categorized as follow Rare Earth Magnets:

Made from alloys of rare earth elements, rare earth magnets are strong permanent magnets. As they are stronger than ferrite or alnico magnets, the magnetic fields produced by them are also higher. Rare Earth magnets re useful in the following ways

They are used in computer hard drives.
Rare earth magnets also find their utility in high-end speakers. •Useful in experiment with diamagnetic levitation.
Helpful in the study of magnetic field dynamics.
They are also studied for superconductor levitation.
Alnico Magnets:
Alnico is an alloy produced by mixing aluminum, nickel and cobalt with certain addition of other metals like copper, iron and titanium. Capable of producing strong magnetic field, it has an excellent linear temperature characteristics and has wide industrial applications Types of Alnico Magnets

On the basis of manufacturing process and application alnico can be grouped into following types: •Cast Alnico
Sintered Alnico
Bar Alnico
Alnico magnets have applications in the following areas:
Electric motors
Electric guitar pickups
Cow magnets
Automotive and electronic sensors
Hall effect sensors
Reed switches
TWT amplifiers
Bonded Magnets
Alnico bonded magnets are those engineering products that are manufactured by using various techniques and various ingredients. They are available in various shapes, sizes and are used for various industrial applications. They are used in laser printer rolls, motor magnets, color monitors etc Types

Bonded magnets are prepared by using various techniques, materials and methods. Each type of alnico bonded magnets has their own peculiarities, features and applications. Different types of polymer bonded magnets are as follows: •Injection Molded Magnets

Flexible Bonded Magnets
Compression Magnets
Bonded NDFEB Magnets
Bonded ALNICO Magnets
Bonded Samarium Cobalt Magnets
Bonded Ferrite Magnets
Ceramic Magnets
Ceramic magnets are permanent magnets made up of a composite of iron oxide and barium/strontium carbonate. Through pressing and sintering ceramic magnets are made. These magnets are also made in different grades. They are widely used magnets with good magnetic strength and resistance to demagnetization. The color of ceramic magnet is charcoal gray and they normally appear in the forms of discs, rings, blocks etc

Ceramic magnets find their applications in the following fields: •DC permanent magnet motors
DC brushless motors
Speaker magnets
Magnetic resonance imaging
Separators that is it separates ferrous material from non-ferrous materials •In magnetic assemblies meant for lifting, holding, retrieving, and separating •Food processing industries

Channel Magnets
Channel bar magnets are permanent magnets which find their applications in removing iron from less contaminated materials like rice, flair, glaze, slip, glass, mineral powder, slurry, chemical, liquid material, food products etc. The channel magnet comes in many shapes, sizes and strength to meet the specific purpose. These magnets are ideally suited to remove tramp iron from material carried in chute. They also have great utility for chemical slurry. These magnets have pole at their ends which are marked by the arrows The alnico channel bar...
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