CN-116762258-B - Rotor and rotating electrical machine

CN116762258BCN 116762258 BCN116762258 BCN 116762258BCN-116762258-B

Abstract

The rotor includes first and second magnet housing regions, first and second outer-periphery-side magnetic gaps, first and second inner-periphery-side magnetic gaps, outer-periphery-side center magnetic gaps, inner-periphery-side center magnetic gaps, first and second outer-periphery-side bridge portions, first and second inner-periphery-side bridge portions, a center bridge portion, first and second permanent magnet holding protrusions, and second protrusions for each magnetic pole of the rotor core. The first and second outer-peripheral-side bridge portions are arranged such that a distance between them becomes narrower from an outer peripheral side toward an inner peripheral side of the rotor core. The first and second inner-peripheral-side bridge portions are arranged such that the distance between them becomes narrower from the outer peripheral side toward the inner peripheral side of the rotor core, and are connected to the first and second outer-peripheral-side bridge portions, respectively.

Inventors

UCHIDA HIDEAKI
KANO SUSUMU

Assignees

株式会社东芝
东芝基础设施系统株式会社

Dates

Publication Date: 20260508
Application Date: 20220113

Claims (3)

1. A rotor, comprising: A rotor core having a rotation center; A plurality of permanent magnets provided to the rotor core, the plurality of permanent magnets forming a plurality of magnetic poles around the rotation center; a first magnet housing region and a second magnet housing region each provided to each of the magnetic poles of the rotor core, each of the first magnet housing region and the second magnet housing region having one end portions disposed apart from each other in a circumferential direction of the rotor core at a position close to an outer peripheral surface of the rotor core, and each of the other end portions disposed close to each other at a position apart from the outer peripheral surface of the rotor core in a radial direction of the rotor core, the first magnet housing region and the second magnet housing region housing each of the permanent magnets; A first outer-peripheral-side magnetic gap and a second outer-peripheral-side magnetic gap provided in each of the magnetic poles of the rotor core, in contact with one end portions of each of the first magnet accommodating region and the second magnet accommodating region, and open to the outside of the rotor core through the outer periphery of the rotor core; a first inner circumferential magnetic gap and a second inner circumferential magnetic gap provided at each of the magnetic poles of the rotor core, and contacting the other end portions of the first magnet housing area and the second magnet housing area; An outer peripheral side center magnetic gap and an inner peripheral side center magnetic gap provided for each of the magnetic poles of the rotor core, the first inner peripheral side magnetic gap and the second inner peripheral side magnetic gap being located on an outer peripheral side and an inner peripheral side of the rotor core in a radial direction so as to be separated from each other; A first outer-peripheral-side bridge portion and a second outer-peripheral-side bridge portion, each of which is disposed between the first inner-peripheral-side magnetic gap and the outer-peripheral-side central magnetic gap and between the second inner-peripheral-side magnetic gap and the outer-peripheral-side central magnetic gap, respectively, of the rotor core, and is configured such that a distance between each of the first outer-peripheral-side bridge portion and the second outer-peripheral-side bridge portion is narrowed from an outer peripheral side toward an inner peripheral side of the rotor core, and the first outer-peripheral-side bridge portion and the second outer-peripheral-side bridge portion are connected to a region of the rotor core on an outer peripheral side than the first magnet housing region and the second magnet housing region, the first outer-peripheral-side magnetic gap and the second outer-peripheral-side magnetic gap, the first inner-peripheral-side magnetic gap and the second inner-peripheral-side magnetic gap, and the outer-peripheral-side central magnetic gap; A first inner-peripheral-side bridge portion and a second inner-peripheral-side bridge portion, each of which is disposed between the first inner-peripheral-side magnetic gap and the inner-peripheral-side center magnetic gap and between the second inner-peripheral-side magnetic gap and the inner-peripheral-side center magnetic gap, respectively, in the rotor core, and is configured such that a distance between each of the magnetic poles is narrowed from an outer peripheral side to an inner peripheral side of the rotor core, the first inner-peripheral-side bridge portion and the second inner-peripheral-side bridge portion being connected to the first outer-peripheral-side bridge portion and the second outer-peripheral-side bridge portion, respectively, and being connected to a region of the rotor core that is further toward the inner peripheral side than the first magnet accommodating region and the second magnet accommodating region, the first outer-peripheral-side magnetic gap and the second outer-peripheral-side magnetic gap, the first inner-peripheral-side magnetic gap and the second inner-peripheral-side center magnetic gap, and the inner-peripheral-side center magnetic gap, respectively; A center bridge portion provided between the magnetic poles of the rotor core, the center bridge portion being located between the outer peripheral side center magnetic gap and the inner peripheral side center magnetic gap, and being provided between the connecting portions of the first outer peripheral side bridge portion and the first inner peripheral side bridge portion and the connecting portions of the second outer peripheral side bridge portion and the second inner peripheral side bridge portion; A first protrusion for holding the permanent magnet, provided on each of the magnetic poles of the rotor core, protruding from the connection portion of the first outer circumferential bridge portion and the first inner circumferential bridge portion into the first inner circumferential magnetic gap so as to face the first magnet accommodating region, and A second protruding portion for holding the permanent magnet, provided in each of the magnetic poles of the rotor core, protruding from the connecting portion of the second outer circumferential bridge portion and the second inner circumferential bridge portion into the second inner circumferential magnetic gap so as to face the second magnet accommodating region, In the first outer-peripheral-side bridge portion, a portion that becomes a boundary with the outer-peripheral-side center magnetic gap includes a linear portion that extends in a linear manner, In the first inner peripheral side bridge portion, a portion which becomes a boundary with the inner peripheral side central magnetic gap includes a linear portion extending in a linear manner, In the second peripheral bridge portion, a portion which becomes a boundary with the peripheral center magnetic gap includes a linear portion extending in a linear manner, In the second inner peripheral side bridge portion, a portion which becomes a boundary with the inner peripheral side central magnetic gap includes a linear portion extending in a linear manner, The portion of the center bridge portion that is the boundary with the inner peripheral side center magnetic gap includes a linear portion that extends in a direction orthogonal to a virtual line including the linear portion of each of the first outer peripheral side bridge portion, the first inner peripheral side bridge portion, the second outer peripheral side bridge portion, and the second inner peripheral side bridge portion, An intersection of the virtual straight line including the straight portion of the first outer peripheral side bridge portion and the virtual straight line including the straight portion of the center bridge portion is located at a position farther from the first magnet accommodating region than an intersection of the virtual straight line including the straight portion of the first inner peripheral side bridge portion and the virtual straight line including the straight portion of the center bridge portion, An intersection of the virtual straight line including the straight portion of the second outer peripheral side bridge portion and the virtual straight line including the straight portion of the center bridge portion is located at a position farther from the second magnet accommodating area than an intersection of the virtual straight line including the straight portion of the second inner peripheral side bridge portion and the virtual straight line including the straight portion of the center bridge portion.
2. The rotor of claim 1, wherein the rotor comprises a plurality of rotor blades, The minimum value of the width dimension of the first inner peripheral side bridge portion in the circumferential direction of the rotor core is the same as or larger than the minimum value of the width dimension of the first outer peripheral side bridge portion in the circumferential direction of the rotor core, The minimum value of the width dimension of the second inner peripheral side bridge portion in the circumferential direction of the rotor core is the same as or greater than the minimum value of the width dimension of the second outer peripheral side bridge portion in the circumferential direction of the rotor core.
3. An electric rotating machine, comprising: the rotor according to claim 1 or 2, and A stator rotatably supporting the rotor.

Description

Rotor and rotating electrical machine Technical Field Embodiments of the present invention relate to a rotor of a rotating electrical machine having a permanent magnet, and a rotating electrical machine provided with the rotor. Background In recent years, permanent magnets with high magnetic energy product have been developed by remarkable research and development of permanent magnets, and permanent magnet rotary electric machines using the permanent magnets have been used as motors or generators for electric vehicles and automobiles. The rotary electric machine includes a cylindrical stator and a cylindrical rotor rotatably supported inside the stator. The rotor includes a rotor core and a plurality of permanent magnets embedded in the rotor core. By these permanent magnets, a plurality of magnetic poles are formed in the cylindrical direction of the rotor core. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2020-014322 Patent document 2 Japanese patent application laid-open No. 2014-060835 Disclosure of Invention Problems to be solved by the invention In the permanent magnet type rotary electric machine as described above, it is an important problem to maintain sufficient strength of the rotor core against centrifugal force. An object of an embodiment of the present invention is to provide a rotor and a rotating electrical machine capable of avoiding irreversible demagnetization of a permanent magnet while maintaining sufficient strength in a rotor core. Means for solving the problems The rotor of the embodiment comprises a rotor core having a rotation center, a plurality of permanent magnets provided on the rotor core to form a plurality of magnetic poles around the rotation center, a first magnet housing area and a second magnet housing area provided on each of the magnetic poles of the rotor core, each of the first and second magnet housing areas having one end portion disposed apart from each other in a circumferential direction of the rotor core at a position near an outer circumferential surface of the rotor core and each of the other end portions disposed close to each other at a position apart from the outer circumferential surface of the rotor core in a radial direction of the rotor core, the first and second magnet housing areas housing each of the permanent magnets, a first outer circumferential side magnetic gap and a second outer circumferential side magnetic gap provided on each of the magnetic poles of the rotor core and in contact with one end portion of each of the first and second magnet housing areas and passing through an outer circumferential surface of the rotor core, a first inner circumferential side magnetic gap and a second inner circumferential side magnetic gap provided on each of the rotor core and each of the other at a position near each of the positions apart from the outer circumferential surface of the rotor core in a radial direction of the rotor core, a first and second circumferential side magnetic gap provided on each of the first and second circumferential side magnetic gap bridging each of the first and second magnetic gap provided on each of the magnetic gap between the first and second magnetic gap on each of the outer circumferential side of the rotor core and one end portion of the first and second magnetic gap on each of the rotor core and second magnetic gap on each of the outer circumferential side of the magnetic gap on each of the rotor core and the magnetic gap on each of the magnetic gap on the one circumferential side of the rotor core and the other, And the second inner peripheral side magnetic gap and the outer peripheral side center magnetic gap are arranged such that the interval therebetween is narrowed from the outer peripheral side toward the inner peripheral side of the rotor core, and the first and second outer peripheral side bridge portions are connected to the rotor core at a position on the outer peripheral side than the first and second magnet housing regions, the first and second outer peripheral side magnetic gaps, the first and second inner peripheral side magnetic gaps, and the outer peripheral side center magnetic gap, respectively, between the first and second inner peripheral side magnetic gaps, the inner peripheral side center magnetic gap, and the magnetic poles of the rotor core, And the second inner peripheral side magnetic gap and the inner peripheral side center magnetic gap, and is configured such that a distance between each other becomes narrower from an outer peripheral side toward an inner peripheral side of the rotor core, the first inner peripheral side bridge portion and the second inner peripheral side bridge portion being connected to the first outer peripheral side bridge portion and the second outer peripheral side bridge portion, respectively, and is compared with the first magnet accommodating area and the second magnet accommodating area in the rotor core th