Mitsubishi Electric Corporation

Hiroki Maeda

Akihiro Yamamura

Toshihiro Matsunaga

Kazuhisa Takashima

Akihiko Morikawa

Masayuki Miyaoka

The hole diameter of a shaft through hole formed in the rotor core is changed in the axial direction, thereby forming a concave portion whose hole diameter is large and a convex portion whose hole diameter is small in the inner circumferential surface of the shaft through hole; the convex portion is arranged at opening portions on both ends of the shaft through hole; a shaft having ridge-shaped convex portions on a press-fitting portion is press-fitted into the shaft through hole to assemble; the number of points of the concave portion is equal to or more than two; and respective diameter dimensions of the concave portion, the convex portion, and the shaft are set to be the diameter of a main body of the shaft&#x3c;the diameter of the convex portion&#x3c;the diameter of ridge-shaped convex portions of the shaft&#x3c;the diameter of the concave portion.

Growing community of inventors

Chiyoda-ku, Japan

Hiroki Maeda