The discrepancy usually isn’t the steel—it’s the mechanical resonance triggered by poor lamination precision.
🔻 High Burr (>0.03mm) → Uneven clamping pressure → Non-uniform magnetostriction → Harmonic resonance and localized vibration → Excessive noise and increased eddy current loss.
Hardcore Technical Solutions:
📐 1. Burr Control: Using high-precision Qiyuan longitudinal and transverse shear lines, we maintain burr heights strictly < 0.02mm. This ensures perfectly flat lamination contact.
🗜️ 2. Stacking Factor Optimization: A stacking factor > 96% ensures the core is a cohesive mechanical unit. This eliminates the “micro-gaps” that cause lamination rattling under high flux density.
⚡ 3. Step-Lap Geometry: Precision 6-step or 7-step lap joints reduce magnetic flux congestion at the corners. This smooths the flux transition, directly lowering magnetostriction-induced noise.
For engineers struggling with dB limits in urban substations, these manufacturing tolerances are the primary variables to audit.
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