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Ferrite
sintered magnet
ferrite magnet also includes both isotropic and anisotropic magnets, with
the latter intended for improved magnetism by pressing in a magnetic fild.
This formation in
amagnetic fild is classified into wet and dry process.
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Wet type ferrite
magnet
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Dry type ferrite
magnet
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Characteristics of ferrite magnet
- Small reversible permeability.
- Reluctance against action of demagnetizing field.
- Residual magnetic flux density somewhat lower than
that of ALNICO magnet but with exceptionally great coercive force.
- Low specific gravity, ease of cutting due to use of
ceramic material, and application for a wide range of purposes.
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* Typical applications of
ferrite magnent
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Wet type
anisotro
pic
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Automobile motor
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Starter. Power window. Wiper. Radiator
fan. Heater blower.
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OA . FA motor
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Capstan. Spindle. Brushless. Stepping
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Sound
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Loud speaker. Head phone. Bell &
Buzzer.
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Correspondence
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Telephone handest unite (Receiver
& transmitter)
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Other
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Magnetron. Magnet chuck. Sperator.
Relay sensor. Other.
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dry type
anisotro
pic
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Elevators door. Dash washer. Water
pump. D.C. Motor. Attachments. Catches & Tools. Stepping motor.
Brushless motor. Toy and Industrial usage e.g. meter.
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dry type
isotropic
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Dynamo. Timer & Coupling. Toy
motor / Audio motor. Catches and Memo holder. Toy .
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* Magnetic properties of territe
magnet
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pressing
method
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material
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Remanence (Br)
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coercive force(Oe)
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intrinsic coercive
force(iHc)
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Max energy
product (BHMax)
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G
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T
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Oe
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KA/m
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Oe
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KA/m
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MGOe
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KJ/m3
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Wet type
anisotro
pic
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Hi Br material
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4100 ~4300
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0.41 ~0.43
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2700 ~3000
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215 ~239
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2750 ~3100
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219 ~247
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4.0 ~4.4
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31.8 ~35.0
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Hi iHc material
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3600 ~4000
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0.36 ~0.40
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3100 ~3800
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247 ~302
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3150 ~5000
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251 ~398
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3.2 ~4.2
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25.5 ~33.4
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dry type
anisotro
pic
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Hi Br material
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3800 ~4100
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0.38 ~0.41
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2800 ~3100
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223 ~247
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2900 ~3200
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231 ~255
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3.5 ~4.0
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27.9 ~31.8
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Hi iHc material
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3600 ~3800
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0.36 ~0.38
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3200 ~3500
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255 ~279
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3300 ~3600
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262 ~286
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3.0 ~3.6
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23.9 ~28.6
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dry type
isotro
pic
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2100 ~2300
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0.21 ~0.23
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1700 ~1900
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135 ~151
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3400 ~3800
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270 ~302
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1.0 ~1.2
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7.96 ~9.54
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* Dimensions
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Segment magnet
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Block magnet
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Ring magnet
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