Soichiro Yoshizaki
Electrical Steel Research Dept.
JFE Steel
Abstract
Electric vehicles require highly efficient drive motors to extend driving range.
Higher efficiency requires non-oriented electrical steel sheet for use as iron core materials that offer lower iron losses.
However, iron losses in electrical steel drastically increase due to the stress applied during punching, shrink fitting, and other motor assembly processes.
Fabrication technologies and material development are two potential approaches that seek to mitigate these iron losses.
Practical applications as iron core materials already exist for JNEX™ steel sheet with 6.5% uniform silicon content and JNHF™ steel sheet with 6.5% silicon content on the surface layer, significantly suppressing the increase in iron losses due to stress. We mass produce the electrical steel expected to become commonplace in high-efficiency motor applications through a chemical vapor deposition process.
This case study presents an example that evaluates the impact of the shrink fitting stress on IPM motor efficiency and iron losses.
We verify how effectively JNHF™ steel sheet with 6.5% surface silicon suppresses iron loss increases and efficiency drops caused by shrink fitting.
Additionally, we examine its effectiveness through JMAG numerical simulations.
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