To provide a stacked cores for a rotating machine which can reduce the eddy current loss.
On a sheet core 2, recessed parts 4a formed on the surface of a magnet pole part and protruding parts 4b that project on its back surface are provided. The recessed parts 4a and the protruding parts 4b of the sheet cores 2, which are stacked, are press-connected to each other. But press- connectable positions and non press-connectable ones of the recessed parts 4a to the protruding parts 4b are provided alternately in the circumferential direction. In the stacked cores made by stacking these sheet cores 2, the press- connecting parts 'A' are dislocated in the circumferential direction for each group of a given number of pieces of the sheet cores 2. This structure prevents the press-connecting parts A from continuing in the stacking direction, so that the eddy current loss can be reduced sharply. Also, by rotating and stacking a given number of pieces of the sheet cores 2 in the circumferential direction, the total length of the stacking direction can be made equal over the entire circumference. In this way, good balance is made, when it is rotated, with the effect of lessening the vibrations and abnormal noises.
ITO MOTOYA
MOROTO KIYONORI
| JPH09131004A | 1997-05-16 | |||
| JPS62107404U | 1987-07-09 | |||
| JPH02264411A | 1990-10-29 |