Failing acoustic tests or struggling with localized overheating at the core joints?
Traditional butt-lap or simple miter joints in CRGO transformer cores introduce abrupt magnetic reluctance changes. The resulting magnetic effects commonly include: → Flux crowding near the joint region → Localized flux saturation → Amplified magnetostrictive vibration → Excessive localized heating and elevated noise output
At Chenfan Electric, Multi-Step Lap (MSL) geometry is applied to reduce these magnetic bottlenecks. Instead of concentrating the magnetic transition at a single interface, MSL distributes the effective air gaps across multiple staggered laminations.
Our manufacturing parameters and magnetic advantages: → Burr height maintained < 0.02 mm: Helps minimize insulation damage and reduce interlaminar short-circuit risk in CRGO steel. → Stacking factor > 97%: Helps improve magnetic continuity and structural stability under electromagnetic forces. → Acoustic & Thermal Result: Core noise can typically be reduced by 3–5 dB compared with conventional butt-lap joints, while localized thermal hotspots are significantly mitigated.
For engineering teams addressing acoustic and thermal performance limitations in power transformer design, CRGO core joint geometry remains a critical technical consideration.