| 摘要 |
PROBLEM TO BE SOLVED: To reduce material cost of a rotor case, and to reduce cost by high productivity, by providing required pressure resistant breaking strength by compensating for reduction in allowable stress by welding heat influence, without causing reduction in excitation force efficiency by an increase in the case thickness. SOLUTION: The rotor case 33 is formed of a deep drawing process product of deeply drawing a raw material having the thickness corresponding to the thickness of a welding edge part, by thickening the thickness ts' of a butt welding part to a valve housing 11 of the rotor case 33 more than the thickness ts of a coil installing part. COPYRIGHT: (C)2007,JPO&INPIT
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