| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
In this study, a new short-time heat treatment method named "secondary current heating method" is proposed, which can reduce iron loss in a much shorter time than the conventional large electric furnace. The specific results of this research are as follows. (1) We proposed the "secondary current heating method," developed an apparatus based on this method, clarified the electromagnetic characteristics of the apparatus and the temperature characteristics of the specimens, and demonstrated that it has sufficient performance for laminated cores of electrical steel sheets. (2) Conventional annealing requires a large electric furnace and takes about 12 hours. We applied the "secondary current heating method" to ring-shaped electrical steel sheet laminated cores and found that magnetic properties could be improved and iron loss reduced by about 10% with a short heat treatment time of 10 minutes.
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