Truck Starter Motor Magnet

Truck starter motors are subject to heavy loads and frequent high-torque demands, requiring magnets with high coercivity and structural strength.

The truck starter motor magnet is manufactured from high-coercivity ferrite, with composition modified by the addition of chromium oxide and molybdenum oxide. This formulation produces an intrinsic coercivity of 350 kA/m, providing strong resistance to demagnetization under high mechanical and electromagnetic stress.

Raw materials consist of high-purity Fe₂O₃, blended in a planetary ball mill for 24 hours under controlled conditions to ensure homogeneous distribution. Forming uses bidirectional pressing, with both upper and lower punches applying up to 180 MPa, producing a final density of approximately 5.3 g/cm³.

Sintering follows a multi-stage temperature profile with dwell platforms at 600°C and 900°C to ensure complete removal of binders and proper development of the ferrite crystal structure. Structural design is reinforced through finite element analysis to optimize geometry for mechanical and electromagnetic stress resistance.

Environmental testing includes thermal cycling from –50°C to 150°C for 100 cycles, vibration testing across 10–2000 Hz at 10G acceleration, and shock testing at 50G for 11 ms. These tests confirm stable performance under dust, moisture, and other demanding conditions typical of truck operations.

Dimensional precision and magnetic properties are verified for each production batch to ensure long-term reliability and consistency for heavy-duty truck starter applications.

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