Permanent Magnet Ferrite Is Very Important In Motorcycle Ignition System
What's the feature of ceramic strontium ferrite magnet made by wet compression molding?
Composition - Contain strontium ferrite (SrFe12O19) as the primary magnetic material. Strontium ferrite has good magnetic properties and is inexpensive to produce.
Density - Have a high relative density of around 95% or more after sintering. This gives good mechanical strength.
An-isotropy - Exhibit strong magnetocrystalline an-isotropy due to their hexagonal crystal structure. This results in a preferred direction of magnetization along one axis.
Particle shape - The strontium ferrite powder used typically has a hexagonal platelet morphology which helps promote magnetic an-isotropy during molding and sintering.
Molding method - The powder is mixed with a liquid binder and compression molded into a dense green compact using high pressures. This orients the an-isotropic particles.
Firing process - The compact is then sintered at high temperature to develop density while preserving the induced magnetic anisotropy orientation from molding.
Coercivity - Usually have medium to high coercivity depending on additives, density, and anisotropy level achieved.
PHYSICAL PROPERTIES OF SINTERED FERRITE MAGNETS
Units | Sintered Ferrite (Ceramic) | |
Curie Temperature | ºC | 450 |
Maximum Operating Temperature | ºC | 350 |
Hardness | Hv | >530 |
Density | g/cm3 | 4.8 – 5.0 |
Relative recoil permeability | μrec | 1.05-1.1 |
Temperature Coefficient Br | %/ºC | -0.18 |
Temperature Coefficient iHc | %/ºC | 0.11-0.40 |
Anti-Bending Strength | N/m2 | (0.5-0.9)×108 |
Anti-Compressive Strength | N/m2 | ≥6.9×108 |
Anti-Tensile Strength | N/m2 | (0.2-0.5)×108 |
Specific Heat | J/kg·K | 600-900 |
Resistivity | Q.cm | >104 |
What's the application of Xinheng's permanent ferrite magnets?
Xinheng mainly manufactures the following types of ceramic arc segment magnets:
How Xinheng fabricates its permanent strontium ferrite magnet?
FERRITE POWDER GRADE OF MOTORCYCLE MOTORS MAGNET
牌号 Grade | Br(mT) | Hcb(KA/m) | Hcj(KA/m) | (BH)max(KJ/m3) | ||||
mT | Gs | KA/m | Oe | KA/m | Oe | KJ/m3 | MGOe | |
Y33 | 410-430 | 4100-4300 | 220-250 | 2760-3140 | 225-255 | 2830-3200 | 31.5-35.0 | 3.9-4.4 |
Y33H | 410-430 | 4100-4300 | 250-270 | 3140-3390 | 250-275 | 3140-3450 | 31.5-35.0 | 3.9-4.4 |
Y33H-2 | 410-430 | 4100-4300 | 285-315 | 3580-3960 | 305-335 | 3830-4200 | 31.8-35.0 | 4.0-4.4 |
Y34 | 420-440 | 4200-4400 | 200-230 | 2510-2890 | 205-235 | 2570-2950 | 32.5-36.0 | 4.1-4.4 |
Y35 | 430-450 | 4300-4500 | 215-239 | 2700-3000 | 217-241 | 2730-3030 | 33.1-38.2 | 4.1-4.8 |
Y36 | 430-450 | 4300-4500 | 247-271 | 3100-3400 | 250-274 | 3140-3440 | 35.1-38.3 | 4.1-4.8 |
Y38 | 440-460 | 4400-4600 | 285-305 | 3580-3830 | 294-310 | 3690-3890 | 36.6-40.6 | 4.6-4.8 |
Y40 | 440-460 | 4400-4600 | 330-354 | 4150-4450 | 340-360 | 4270-4520 | 37.6-41.8 | 4.7-5.2 |
MOTORCYCLE MOTORS MAGNET SPECIFICATION TABLE
No. |
Item |
R |
r |
W |
L |
h |
Grade |
Application |
1 | W118 | 68.1 | 60.7 | 25 | 25 | 7.50 | Y33H | 1KW inverter motor |
2 | W018F | 72.5 | 60.7 | 27.9 | 35 | 11.80 | Y40 | 2KW inverter motor |
3 | W005A | 72.5 | 60.5 | 29.5 | 42 | 11.80 | Y33H | 2.3KW inverter motor |
4 | W050E | 87.3 | 78.5 | 24 | 40 | 8.80 | Y33H | 2.6KW inverter motor |
5 | W159 | 74.1 | 65.5 | 28.86 | 47 | 8.60 | Y40 | 2.8KW inverter motor |
6 | W017F | 86.5 | 78.5 | 24.0 | 51 | 7.90 | Y33H-2 | 3KW inverter motor |
7 | W087 | 86.5 | 78.5 | 24.0 | 64 | 7.80 | Y33H-2 | 5KW inverter motor |
8 | W138C | 101 | 90.2 | 24.5 | 65 | 10.8 | Y40 | 7KW inverter motor |
9 | W019B | 112 | 100 | 28.5 | 60 | 11.90 | Y40 | 9KW inverter motor |
In the ignition system of motorcycles, permanent magnet ferrite is mainly used in the following aspects:
Ignition coils: Many motorcycle ignition systems use ignition coils made of permanent magnet ferrite to improve the conversion efficiency of ignition voltage and current. Permanent magnet ferrites have high magnetic properties and are able to amplify the current, thus ensuring a strong spark when ignited.
Trigger: Permanent magnet ferrite can be used as a magnetic source in the trigger to generate induced current through speed changes, control the accuracy of the ignition time, and improve the starting performance and fuel consumption efficiency of the engine.
Energy storage: In some ignition systems, permanent magnet ferrite can be used as an energy storage device to release energy at an instant through changes in the magnetic field, providing the required instantaneous current for ignition and ensuring the ignition stability of the motorcycle under harsh conditions.
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