Different sizes of Bonded Ferrite Magnet

Bonded ferrite, also known as plastic magnet, is a magnet formed by pressing molding(The  production method is mainly used to produce flexible magnets), extrusion molding. (The production method of extrusion molding is mainly used to produce extruded magnetic strips)and injection molding. (The production method of injection molding is mainly used to produce rigid plastic magnets) after mixing ferrite magnetic powder and resin (PA6/PA12/PA66/PPS), among which injection ferrite is the main one. Its characteristic is that it can not only be magnetized by axial single pole, but also by multi-pole radial magnetization, and it even can also be magnetized by axial and radial compound magnetization.
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Bonded Ferrite magnet features: 1. Can be made into permanent magnets of small sizes, complex shapes and high geometric accuracy with press moulding and injection moulding. Easy to achieve large-scale automated production. 2. Can be magnetized via any direction. Multi poles or even countless poles can be realized in bonded Ferrite. 3. Bonded Ferrite magnets are widely used in all kinds of micro motors, such as spindle motor, synchronous motor, stepper motor, DC motor, brushless motor, etc.
Magnetic Characteristics and Physical Properties of Bonded Injection Moulding Ferrite
Series Ferrite
Anisotropic
Nylon
Grade SYF-1.4 SYF-1.5 SYF-1.6 SYF-1.7 SYF-1.9 SYF-2.0 SYF-2.2
Magetic Charactari -stics Residual Induction (mT) (KGs) 240 2.40 250 2.50 260 2.60 275 2.75 286 2.86 295 2.95 303 3.03
Coercive Force (KA/m) (Koe) 180 2.26 180 2.26 180 2.26 190 2.39 187 2.35 190 2.39 180 2.26
Intrinsic Coercive Force(K oe) 250 3.14 230 2.89 225 2.83 220 2.76 215 2.7 200 2.51 195 2.45
Max. Energy Product    (MGOe) 11.2 1.4 12 1.5 13 1.6 14.8 1.85 15.9 1.99 17.2 2.15 18.2 2.27
Physical Charactari -stics Dendity (g/m3) 3.22 3.31 3.46 3.58 3.71 3.76 3.83
Tension Strength (MPa) 78 80 78 75 75 75 75
Bend Strength  (MPa) 146 156 146 145 145 145 145
Impact Strength  (J/m) 31 32 32 32 34 36 40
Hardness (Rsc) 118 119 120 120 120 120 120
Water Absorption (%) 0.18 0.17 0.16 0.15 0.15 0.14 0.14
Thermal Deformation Temp. (℃) 165 165 166 176 176 178 180
The magnetic performance indicators of bonded ferrite products mainly include residual magnetic induction intensity Br, intrinsic coercive force Hcj, maximum magnetic energy product (BH)max, etc. With the development of miniaturization of electronic components, the volume of magnets is getting smaller and smaller, so the performance of magnets must be developed towards high performance. The magnetic properties of bonded ferrite are determined by the filling rate of magnetic powder in the magnet, the degree of orientation of magnetic powder and the intrinsic properties of magnetic powder. Its advantages are that the appearance of the product is smooth and flawless, the dimensional accuracy is high, the consistency is good, no subsequent processing is required, the performance is stable, and the magnetic energy product of any size from the maximum value to zero can be generated, and the temperature stability is good, and the corrosion resistance is good. High coercive force, shock resistance and impact resistance are good, meanwhile the product can be complicated to be processed into different shapes. It is mainly used in home appliances, automobiles and office fields such as copiers, printer magnetic rollers, hot water pumps for electric water heaters, fan motors, automobiles, motor rotors for inverter air conditioners, etc.

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