In practice, core loss deviations are often introduced after the steel leaves the mill. During slitting and punching, residual mechanical stress is inevitably generated at the cut edges. While grain orientation remains unchanged, this stress affects magnetic domain wall movement, leading to measurable degradation in magnetic properties.
Without proper process control and verification, this can result in: → Non-uniform flux distribution at edges and joints → Increased localized losses → Higher no-load loss and noise in the assembled core
At Chenfan Power Technology, we focus on controlling the entire transformation process—from raw material to finished core—to ensure consistency between theoretical design and actual performance.
Our control approach includes: • Burr height strictly controlled below 0.02 mm • Stacking factor optimized (typically > 95–97%, depending on material grade) • Multi-step lap (MSL) joint design to improve flux distribution
More importantly, we verify—not assume:
- Epstein testing before and after slitting to quantify processing-induced degradation
- Finished core no-load loss (NLL) testing to validate real assembled performance
Because in transformer manufacturing, what matters is not the MTC—but the performance of the final core.
If you’re facing unexplained no-load loss deviations, it may be time to evaluate not just the material—but the processing behind it.