Powerful Isotropic Ferrite Ring Magnets
Ring Ferrite Magnets—As important parts of magnetic materials, hard ferrite materials play a heavyrole in electronic industry, electronic information industry, car industry, motorcycle industry etc. meanwhile, they are also widely used in medical treatment, mining and metallurgy, industrial automation, oil energy industry and civil industry.
Ceramic (ferrite) magnets are composed of SrO or BaO and Fe2O3. They are charcoal gray in color and usually appear in the forms of discs, rings, blocks, cylinders, and sometimes arcs or segments for motors.
Attributes of Ceramic Magnets:
• Least expensive material compared to alnico and rare earth magnets
• High intrinsic coercive force
• Available in simple shapes only due to manufacturing process
• Lower service temperature than alnico, greater than rare earth
• Lower energy product than alnico and rare earth magnets
• Most common grades of Y25,Y30,Y30H-1,Y30H-2,Y32,Y33 ceramic are 1, 5 and 8 (1-8 possible)
| Material |
Iso/ Anisotropic |
Remanence |
Coercivity |
Intrinsic Coercivity |
Max Energy product |
||||
| Br(mT) | Br(Gs) | bHc(KA/m) | bHc(Oe) | iHc(KA/m) | iHc(Oe) | (BH)max(KJ/m 3 ) | (BH)max(MGOe) | ||
|
Y10T c1 |
Isotropic | ≥200 | ≥2000 | ≥125 | ≥1600 | ≥210 | ≥2600 | ≥6.5 | ≥0.8 |
| Y20 | Anisotropic | ≥360 | ≥3600 | ≥135 | ≥1700 | ≥140 | ≥1760 | ≥20.0 | ≥2.5 |
| Y25 | Anisotropic | ≥380 | ≥3800 | ≥144 | ≥1800 | ≥150 | ≥1880 | ≥24.0 | ≥3.0 |
|
Y30 c5 |
Anisotropic | ≥390 | ≥3900 | ≥184 | ≥2300 | ≥188 | ≥2350 | ≥27.6 | ≥3.4 |
|
Y30BH c8 |
Anisotropic | ≥390 | ≥3900 | ≥240 | ≥3000 | ≥256 | ≥3200 | ≥27.6 | ≥3.4 |
|
Y35 c11 |
Anisotropic | ≥410 | ≥4100 | ≥208 | ≥2600 | ≥212 | ≥2660 | ≥30.4 | ≥3.8 |
Manufacturing process and magnetizing
1 With dry process can produce isotropic & anisotropic magnets, the tool can be changed and developed easily.
2 With wet process only can produce anisotropic magnets,it is complicated to change the tool and the tooling charge is high.
3 Isotropic ferrite magnets can be magnetized in any direction.
4 Anisotropic ferrite magnets are all oriented in the manufacturing direction, and can be magnetized in the direction of orientation.
Tolerances:
For as pressed material, tolerance on the thickness (direction of magnetization) is ± .005inch. Other dimensions are ± 2% or ± .010inch, whichever is greater.
Applications
Ferrite Ring magnets are made specifically for loudspeaker systems and their sizes have evolved with demand from this market. However, ceramic ring magnets are also commonly used in magnetic rollers for separating applications and in the printing industry. They are also a vital component found in fast running conveyor systems in many manufacturing plants dealing with ferrous material.
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