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 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
Alnico magnets have applications in the following areas:
•Electric guitar pickups
•Automotive and electronic sensors
•Hall effect sensors
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
•Bonded NDFEB Magnets
•Bonded ALNICO Magnets
•Bonded Samarium Cobalt Magnets
•Bonded Ferrite 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
•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 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...