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Magnetic
materials are widely used in our daily lives, service as
essential components from general family appliances,
computers, office machines and automobiles to specific
industrial and medical equipment. But they are also famous
for their complicated terminology. Permanent magnets are
difficult materials to characterize completely, so many
terms used to describe just what a magnet is. Gauss and
Oersted are not everyday terms like Watt, mile or kilometer,
pound or kilogram, etc.
The
world of magnetic materials is divided into two
parts,
· Hard magnetic
materials, like NdFeB, SmCo, AlNiCo, Hard Ferrite and
Flexible
· Soft
magnetic materials, like Iron, soft Ferrite and Permalloy (a
nickel-iron alloy)
Hard magnetic materials supply flux, and soft magnetic
materials carry flux.
Magnetic flux creates a magnetic field.
How
much flux and where it travels depend on many
factors:
· The hard
magnetic material used
· The size and shape of the hard magnetic material
· Nearby soft magnetic materials, usually called a
return path
· Other magnetic fields arising from a current carrying
coil of winding in a motor
· Temperature, usually but not always, things get worse
as the temperature goes up
Where
Magnets Work
Automotive:
· Permanent Magnet Starter Motors
· Sensors
· Electric Fuel Pumps
· Instrumentation Gauges
· Brushless DC Motors
· Actuators
Computer
and Office Automation:
· Disk Drive Spindle and Voice Coil Motors
· Printer and Fax Stepper Motors
· Printer Hammer
· Copy Machine Rollers
· CD-ROM Drive Spindle and Pick-up Motors
Consumer
Electronics:
· VCRs and Camcorders
· Cameras
· Speakers
· Headsets
· Microphones
· Pagers
· Watches
· DVD Players
Appliance:
· Portable Power Tool Motors
· Household Appliance Motors
· Scales
Industrial
/ Factory Automation:
· Robot
Motors
· Robot Arms
· Magnetic Coupling, Pumps
· Servo Motors
· Linear Motors
· Generators
· Magnetic Tool
· Magnetic Bearings
· Magnetic Separators and holders
Medical
and Educational purposes
How
To Choose Right Magnets
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