The Effect of Short Circuit between Laminated Steel Sheets on the Performance of Lamination Core of Motor

Kaido Chikara, Mogi Hisashi, Hanzawa Kazufumi

doi:10.1541/ieejfms.123.857

The effects of short circuits between laminated steels in lamination cores, caused by clinching or welding, are discussed in this paper. A short circuit between laminated steels increase a core loss. A short-circuit resistance r₁due to clinching is more affected by contact resistance than by the electrical resistivity of core material and it is inversely as the third order of the thickness of core material. In the case of welding, r₁ is influenced by the resistivity of core material and it is inversely as the second order of core material thickness, if the width and depth of welding, such as laser welding, are proportional to the thickness. The short-circuit resistance of welding is generally smaller than that of clinching, and then the short-circuit loss caused by welded core will be larger than that by clinching. According to theoretical calculation, the short-circuit losses are possibly larger than iron losses due to core materials in actual cores and more than two times in the case of segment motor cores, because the number of clinch-ing or welding is large. As the method to reduce the short-circuit losses or to avoid the short circuits, it is necessary to use thin electrical steel sheets with high electrical resistivity as core materials, or to fix laminated steels by means of adhesion or molding.

The Effect of Short Circuit between Laminated Steel Sheets on the Performance of Lamination Core of Motor

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