CORE SHEET AND METHOD OF MANUFACTURING SAME
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United States of America Patent
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Issued Date -
Jul 23, 2020
app pub date -
Mar 31, 2020
filing date -
Oct 5, 2017
priority date (Note) -
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Abstract
Disclosed are a core sheet and a manufacturing method thereof. The core sheet has an annular core back portion and a plurality of tooth portions extending from the core back portion toward a radial center thereof. The core sheet is obtained by performing a blanking step, a rolling step and a removing step. In the removing step, an insulation coating, which is on a region of a grain-oriented magnetic steel sheet for forming a band-shaped core back portion, on a band-shaped core back portion of a sheet piece or on the core back portion of the core sheet, is at least partially removed.
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