Bus Starter Motor Magnet
Built for the rigorous demands of bus applications, which require high power output and extended service life, our bus starter motor magnet is engineered for maximum durability and performance. We use a high-temperature Strontium Ferrite material, enhanced with rare-earth element additives such as Lanthanum Oxide (La₂O₃) and Neodymium Oxide (Nd₂O₃).
Product Introduction
Bus starter motors require magnets capable of high power output and long service life under frequent and extended use.
The magnet is made from high-temperature strontium ferrite with controlled additions of rare-earth elements, including lanthanum oxide (La₂O₃) and neodymium oxide (Nd₂O₃), which increase the Curie temperature to approximately 480°C. This ensures that magnetic performance remains stable even during prolonged cranking cycles that generate significant heat.
Raw material processing uses spray granulation, with particle size strictly controlled between 80–120 μm to ensure consistent flowability during pressing. Large-scale dry pressing applies pressures up to 200 MPa with a 30-second dwell, producing green compacts with densities around 3.2 g/cm³.
Sintering is performed at high temperature, peaking at 1320°C. The temperature profile is carefully controlled, with slow heating between 800–1000°C to fully remove organic residues and optimize microstructure.
An additional doping step introduces 1–2% aluminum oxide (Al₂O₃) nanoparticles, improving the stability of magnetic properties at elevated
temperatures. The magnet retains over 92% of its magnetic flux at 150°C.
A gradient material design is applied along the thickness direction using multi-layer forming. Each layer has slightly different composition, enhancing both mechanical strength and magnetic circuit distribution for efficient torque generation.
Durability is verified through accelerated life testing simulating 2000 hours of operational conditions. Magnetic performance decay is maintained within 4%, demonstrating suitability for high-frequency, commercial bus applications.
Additional quality control includes dimensional checks, surface inspection, and verification of magnetic properties for each production batch to ensure consistency and long-term reliability.
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