Patent ID: 9343937
Filing Date: 2016-05-17
CPC Classification: H02K

Claim Text:
1. A rotary electric machine, comprising: a stator; a rotary shaft; and a rotor core, wherein: the rotor core is rotatably arranged in an inside hole formed in the stator so that the rotor core is separated from an inner circumferential surface of the stator core by a predetermined gap, the rotor core comprises a plurality of core blocks stacked in an axial direction of the rotor core and forming a step skew by a predetermined skew angle of α in a circumferential direction of the rotor core, each of the core blocks comprises: a central opening hole formed in a central part of each of the core blocks; short protruding sections which are protruded toward a radially inner side of each of the core blocks and face the central opening hole, on a vertical line which connects a central point of a corresponding magnetic pole formed in an inside area of each of the core blocks to a central point of the central opening hole; and long protruding sections which are formed adjacent to the short protruding sections in a circumferential direction of the rotor core, and protruded toward the radially inner side of each of the core blocks and face the central opening hole, on a vertical line which connects a central point of the corresponding magnetic pole formed in the inside area of each of the core blocks to the central point of the central opening hole, and a central angle of a top section of each of the long protruding sections is greater than a central angle of a top section of each of the short protruding sections, when one of the core blocks is sequentially stacked on the other of the core blocks to form the step skew, a communication reference groove is formed along an axial direction of the rotor core by aligning a side section of the short protruding sections in one core block with a side section of the long protruding sections in the other core block, and aligning a side section of the long protruding section in one core block with a side section of the short protruding section in the other core block, and a difference between a central angle of a top section of each of the short protruding sections and a central angle of a top section of each of the long protruding sections is twice the predetermined skew angle of α.