US 12,218,548 B2
Embedded magnet rotor and rotary electric machine
Masakatsu Matsubara, Mie Mie (JP); Masaru Kano, Yokkaichi Mie (JP); Daisuke Yamagishi, Yokkaichi Mie (JP); and Naoya Sasaki, Nagoya Aichi (JP)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (JP); and Toshiba Infrastructure Systems & Solutions Corporation, Kawasaki (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP); and TOSHIBA INFRASTRUCTURE SYSTEMS & SOLUTIONS CORPORATION, Kawasaki (JP)
Filed on Dec. 9, 2022, as Appl. No. 18/064,033.
Application 18/064,033 is a continuation of application No. PCT/JP2022/015396, filed on Mar. 29, 2022.
Prior Publication US 2023/0318373 A1, Oct. 5, 2023
Int. Cl. H02K 1/276 (2022.01)
CPC H02K 1/276 (2013.01) [H02K 2213/03 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An embedded magnet rotor comprising:
a rotor shaft extending in a rotation axis direction;
a rotor core disposed on a radially outer side of the rotor shaft, the rotor core having a plurality of permanent magnet housing spaces formed at near radially outer part of the rotor core with circumferential intervals; and
flat plate-shaped permanent magnets respectively housed in the plurality of permanent magnet housing spaces,
wherein each of the permanent magnet housing spaces extends more radially outward than a range of space that the permanent magnet is held by a magnet holding outer projection formed in the rotor core and each of the permanent magnet housing spaces has a communication opening that communicating with a gap space between the embedded magnet rotor and a stator arranged on a radially outer side of the embedded magnet rotor,
wherein the communication opening is sandwiched by two chips being part of the rotor core and extending in a circumferential direction, and
wherein in a cross section perpendicular to the rotation axis direction, a radial thickness of each of the two chips and a circumferential width of the communication opening are in such a dimensional relation as to prevent a fragment produced when the permanent magnet breaks from protruding through from the communication opening and coming into contact with the stator.