US 12,218,549 B2
Rotary electric machine
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. 15, 2022, as Appl. No. 18/066,810.
Application 18/066,810 is a continuation of application No. PCT/JP2021/044390, filed on Dec. 3, 2021.
Prior Publication US 2023/0179042 A1, Jun. 8, 2023
Int. Cl. H02K 1/276 (2022.01); H02K 1/16 (2006.01)
CPC H02K 1/276 (2013.01) [H02K 1/16 (2013.01); H02K 2201/03 (2013.01); H02K 2213/03 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A rotary electric machine comprising:
a stator including a cylindrical stator iron core in which teeth and slots are arranged alternately in a circumferential direction, and multi-phase armature windings passing through the slots to be wound about the teeth; and
a rotor including a rotor iron core with a plurality of magnetic poles aligned along an outer peripheral surface which is opposed to an inner peripheral surface of the stator iron core with a gap therebetween, and a plurality of permanent magnets provided with each of the magnetic poles, the rotor disposed rotatably about a central axis line which is coaxial with the stator iron core, wherein
in the stator iron core, tips of the teeth defining openings of the slots in the inner peripheral surface between the slots through which the armature windings of different phases pass include a pair of chamfers which are both ends of the inner peripheral surface partially omitted in the circumferential direction, wherein,
given that, in the horizontal cross-section of the rotor iron core which is orthogonal to the central axis line, an axis extending radially passing an end of the magnetic pole in the circumferential direction and the central axis line is q-axis and an axis electrically apart from the q-axis in the circumferential direction at 90 degrees is d-axis,
in each of the magnetic poles, the rotor iron core includes a plurality of grooves the outer peripheral surface of which is concave along the central axis line, each of the grooves forms a wave shape in which concave portions are placed on both sides of a convex portion along a rotation direction of the rotor, and includes a first groove portion disposed in a leading side of the rotation direction with respect to the d-axis between the q-axis passing the both ends of the magnetic pole in the circumferential direction and a second groove portion disposed in a trailing side of the rotation direction, and the first groove portion and the second groove portion are asymmetric with respect to the d-axis.