| 摘要 |
PROBLEM TO BE SOLVED: To firmly fix an armature core to a rotating shaft without causing the deterioration of workability when press-inserting the rotating shaft into the armature core, and to allow rough accuracy for machining a shaft hole 13a into which the rotating shaft is inserted. SOLUTION: The armature core is constituted by dividing prescribed pieces of core sheets 13 into three sheet blocks. The core sheet 13 is formed by press-forming a thin steel plate, communicating holes 13c are formed at the external peripheral side of the shaft hole 13a that is formed in the center, and the communicating holes 13c communicate with the shaft hole 13a. Each sheet block is formed such that a plurality of the core sheets 13 are laminated so that the communicating holes 13c coincide with one another, and lapped with one another in a state that the block is displaced in the circumferential direction at a prescribed angle. By this configuration, the communicating holes 13c of the core sheets 13 communicate with one another, thus forming an air passage that passes through the inside of the armature core in the axial direction as a whole, at the armature core. COPYRIGHT: (C)2005,JPO&NCIPI
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