Week 02
Magnetic Materials and Losses
I revisit magnetic circuits, transformers, and rotating machines around my transformer report and calculation sheets.
What I connect in this unit
The slope of the B-H curve indicates permeability around an operating point, while loop area represents hysteresis energy per cycle. Time-varying flux induces eddy currents in the core, and increasing lamination thickness or frequency raises that contribution to total core loss.
Concept map
- B-H curves
- Hysteresis
- Eddy currents
- Core loss
Technical anchor
Core loss is commonly separated as P_core = P_h + P_e; for trend checks, hysteresis depends on powers of f and B, while eddy-current loss scales roughly with f^2 B^2 t^2.
How I review it
Check allowable flux density from material data, then compare how frequency, core area, and lamination thickness shift the B-H operating point and heating trend at the same volt-second excitation.
Connection to the full course
Unit 2 of 12. Unit numbers expand the saved report and calculations into a reading sequence rather than an attendance record.