Abstract
In this study, we developed an eddy current measurement system to predict the mechanical properties of hairpin coils. To ensure stable current generation within the hairpin coil, drive and pickup coils were designed. To predict mechanical properties, impedance changes in the coil owing to eddy current was formulated using Kirchhoff's voltage law and a simplified transformer model. Using hairpin coils with varying plastic strains, the relationship between impedance phase and ductility was experimentally verified. Yield strength was calculated by substituting the predicted plastic strain, obtained from impedance phase change, into a modified Hockett–Sherby material model derived from tensile tests. The results of eddy current-based yield strength prediction on leveled samples demonstrated a match within a 10% margin of error with tensile test values. This validated the effectiveness of the eddy current-based technique in predicting the mechanical properties of hairpin coils.
| Translated title of the contribution | Development of an Eddy Current-Based Mechanical Property Prediction System for EV Hairpin Wires |
|---|---|
| Original language | Korean |
| Pages (from-to) | 353-360 |
| Number of pages | 8 |
| Journal | Transactions of the Korean Society of Mechanical Engineers, A |
| Volume | 48 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 2024 |
Keywords
- Eddy Current
- Hairpin Coil
- Plastic Strain
- Yield Strength