US 12,136,853 B2
Electric-rotating-machine rotor and manufacturing method therefor
Kohei Yamaguchi, Tokyo (JP); Masafumi Okazaki, Tokyo (JP); and Satoru Akutsu, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 17/771,573
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Dec. 9, 2019, PCT No. PCT/JP2019/048059
§ 371(c)(1), (2) Date Apr. 25, 2022,
PCT Pub. No. WO2021/117087, PCT Pub. Date Jun. 17, 2021.
Prior Publication US 2022/0416596 A1, Dec. 29, 2022
Int. Cl. H02K 1/27 (2022.01); H02K 1/276 (2022.01); H02K 15/03 (2006.01)
CPC H02K 1/276 (2013.01) [H02K 15/03 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An electric-rotating-machine rotor comprising:
a rotor core in which ring-shaped plate materials that are each magnetic materials are stacked in an axial direction; and
a shaft press-fitted into an inner circumferential surface of the rotor core,
wherein the inner circumferential surface has a first press-fitting portion that is an axial-direction section into which the shaft is inserted and a second press-fitting portion that is an axial-direction section adjacent to the first press-fitting portion and into which the shaft is inserted with an interference larger than that of the first press-fitting portion,
the shaft is press-fitted into the inner circumferential surface of the rotor core from the first press-fitting portion side,
the plate material of the rotor core has a recessed portion in one side thereof and a protruding portion at the other side thereof, and the recessed portion and the protruding portion of the respective plate materials that are adjacent to each other are fitted with and fixed to each other,
the inner circumferential surface has a non-press-fitting portion that is an axial-direction section, that is situated opposite to the second press-fitting portion, that is adjacent to the first press-fitting portion, and that has an inner diameter larger than an outer diameter of the shaft,
the ring-shaped plate materials are formed of a plurality of ring-shaped steel plate, each ring-shaped steel plate including a magnetic pole portion, and
a first magnetic pole portion of a first ring-shaped steel plate in the first press-fitting portion presses down with force against a second magnetic pole portion of a second ring-shaped steel plate in the non-press-fitting portion, thereby reducing a vibration-induced noise caused by an axial-direction collision of magnetic pole portions during operation of an electric-rotating-machine comprising the electric-rotating-machine rotor.