| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive rotary electric machine and its stator core, which suppress a reduction in core loss resulting from the use of a cold rolled steel sheet while securing a sufficient welding strength, irrespective of the structure of a stator core which alternately laminates the cold rolled steel sheet formed on a smooth surface and a dull-finished electromagnetic steel sheet, and a method for manufacturing the stator core. SOLUTION: The stator core 1 is structured by alternately laminating the electromagnetic steel sheet 9 and the cold rolled steel sheet 11 via an organic insulative film, and welding portions 6a, 6b, leading from one end in the laminating direction, to the other end, of the outer circumferential surface of a core back portion 2, are formed on the outer circumferential surface of the core back portion 2, causing the laminated electromagnetic steel sheet 9 and the cold rolled steel sheet 11 to be connected integrally. Then, the electromagnetic steel plate 9 is formed in a surface roughness of 0.5μmHr m s or more on both surfaces and both surfaces of the electromagnetic steel plate 9 are covered with the organic insulating film, while the cold rolled steel sheet 11 is manufactured thinner in thickness than that of the electromagnetic steel plate 9, and is formed in a surface roughness of less than 0.5μmHr m s on both surface. COPYRIGHT: (C)2010,JPO&INPIT
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