High Coercivity Permanent Magnet Ferrite Sintered At High Temperaturefor Inverter Motor W123
Company profile
The company boasts the first domestically developed servo fully-automatic wet press oil press machine and the first dual-track roller kiln in the nation. It also possesses the capability for independent design, development, and processing of various types of molds.
The primary business of the company focuses on sintered ferrite permanent magnet components, encompassing automotive motors, motorcycle motors, general machinery motors, household appliance motors, household fan motors, variable frequency motors, water pump motors, and more. These products are widely used in the automotive, motorcycle, office equipment, power tools, household appliances, and fitness equipment industries.
What is permanent magnet ferrite?
Permanent magnet ferrite has a very high magnetic energy product and coercivity, it can produce a large magnetic field and magnetic force under a small size and weight, while having a high magnetic temperature coefficient and thermal stability, can maintain stable magnetic properties at higher temperatures. This makes the permanent magnet ferrite still able to work normally in a high temperature environment and is not easy to lose magnetism. Good corrosion resistance and wear resistance, so that it is not easily affected by the external environment and damage.
What's the application of Xinheng's permanent ferrite magnets?
Xinheng mainly manufactures the following types of ceramic arc segment magnets:
- Automotive motor magnet including automobile starter motor magnet, automobile wiper motor magnet, automobile rolling window motor magnet, automobile heating and cooling fan motor magnet, automobile seat motor magnet, automobile sunroof motor magnet, automobile powsteering motor magnet, automobile tailgate motor magnet, automobile oil pump motor magnet, automobile ABS anti-lock motor magnet, etc.
- Inverter home appliance magnet including inverter washing machine motor magnet, inverter refrigerator motor magnet, inverter air-conditioner motor magnet,etc.
- Fan motor magnet including ceiling fan motor magnet, floor fan magnet, etc.
- Motorcycle motor magnet including motorcycle starter motor magnet, motorcycle flywheel magneto magnet, etc.
- Electrical tool motor magnet including cutting machine motor magnet, electric sawing machine motor magnet, lawn mower motor magnet, gasoline generator magnet, etc.
- Actuator motor magnet including medical bed actuator motor magnet, TV lifting bracket actuator motor magnet, desk lifting actuator motor magnet, smart home appliance actuator motor magnet, etc.
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 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.
- Remanence - Have a maximum magnetic flux density or remanence along the axis of anisotropy, but little/no remanence perpendicular to it.
- Coercivity - Usually have medium to high coercivity depending on additives, density, and anisotropy level achieved.
FERRITE POWDER GRADE OF UNIVERSAL MOTORS MAGNET
| Grade | Br(mT) | Hcb(KA/m) | Hcj(KA/m) | (BH)max(KJ/m3) |
| mT | Gs | KA/m | Oe | KA/m | Oe | KJ/m3 | MGOe |
| Y30H-1 | 380-400 | 3800-4000 | 230-275 | 2890-3460 | 235-290 | 2950-3640 | 27.0-32.5 | 3.4-4.1 |
| 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 |
| Y35 | 430-450 | 4300-4500 | 215-239 | 2700-3000 | 217-241 | 2730-3030 | 33.1-38.2 | 4.1-4.8 |
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