CN-115842423-B - Rotary electric machine

CN115842423BCN 115842423 BCN115842423 BCN 115842423BCN-115842423-B

Abstract

Provided is a rotating electrical machine with improved cooling performance, which is provided with a stator (12) having a stator core (24) and a stator coil (26), a first bracket (16) covering one end surface of the stator core, a second bracket (18) covering the other end surface of the stator core, and a rotor (28). A first channel forming part (40) provided on the outer periphery of the stator core has a first channel (F1) extending from one end to the other end in the axial direction of the stator core, and a second channel (F2) provided on the outer side in the radial direction of the first channel and extending from one end to the other end in the axial direction of the stator core. The first bracket includes an annular peripheral wall (16 a) having an open end facing one end surface of the stator core, a bottom wall (16 b) facing one end surface of the stator core with a gap, and a second flow path forming portion (48) formed by a part of the peripheral wall. The second channel forming section is formed with an external air channel (RA) and an internal air channel (RI).

Inventors

NAITO KATSUHITO
KOYAMA TAIHEI
AN SHIHUI
HASEBE JURO
Shan Xiehedian

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: 20220715
Priority Date: 20210921

Claims (7)

1. An electric rotating machine, comprising: A stator including a cylindrical stator core having a first end surface located at one end in an axial direction, a second end surface located at the other end in the axial direction, and an outer peripheral surface, a stator coil attached to the stator core, and a first flow path forming portion provided on an outer periphery of the stator core, the first flow path forming portion being formed with a first flow path extending from one end to the other end in the axial direction of the stator core, and a second flow path located outside the first flow path in a radial direction of the stator core and extending from one end to the other end in the axial direction of the stator core; a first bracket having an annular peripheral wall having an opening end facing the first end surface, a bottom wall facing the first end surface with a gap, and a second flow path forming portion formed by a part of the peripheral wall, and A second bracket having an annular peripheral wall having an opening end facing the second end surface and a bottom wall facing the second end surface with a space therebetween, The second flow path forming portion of the first bracket includes: a first end wall extending radially from the open end of the peripheral wall and having a circumferential width; a pair of first side walls extending from one end and the other end of the first end wall in the circumferential direction to the bottom wall in the axial direction, respectively, and standing in the radial direction and facing each other at intervals in the circumferential direction; a first bottom wall located between the pair of first side walls, extending from an end of the first end wall on the open end side in the axial direction to the bottom wall, and having the first width in the circumferential direction; A first partition wall located between the pair of first side walls, extending from the first end wall to the bottom wall in the axial direction, and having a first width in the circumferential direction, and opposed to the first bottom wall with a space therebetween in the radial direction; A first top wall located between the pair of first side walls, extending from an end portion of the first end wall on the projecting side to the bottom wall in the axial direction and having the first width in the circumferential direction, and opposed to the first partition wall with a space therebetween in the radial direction; A first outlet formed in the first end wall and having the predetermined width in the circumferential direction, the first outlet being opposed to one end of the first flow path; A second outlet formed in the first end wall and having the predetermined circumferential width, the second outlet being located outside the first outlet in the radial direction and facing one end of the second flow path; A first inlet formed in the first bottom wall and located adjacent to the bottom wall, the first inlet having the first width in the circumferential direction; a second inlet formed in the first bottom wall and located on the first end wall side with respect to the first inlet, the second inlet having a second width in the circumferential direction smaller than the first width; A flow port formed in the first partition wall and located opposite to the second flow port, having a third width in the circumferential direction smaller than the first width, and A tubular second partition wall provided between the first bottom wall and the first partition wall, having one end connected to the first bottom wall and located around the second inlet, and the other end connected to the first partition wall and located around the flow port, An external air flow path connecting the first inlet and the first outlet is formed by the first bottom wall, the first partition wall, the pair of first side walls, and the second partition wall, An internal gas flow path connecting the second inlet port and the second outlet port is formed by the first partition wall, the first top wall, the pair of first side walls, and the second partition wall.
2. The rotating electrical machine according to claim 1, wherein, The second bracket has a third flow path forming portion formed by a portion of the peripheral wall, The third flow channel forming portion includes: A second end wall extending radially from the open end of the peripheral wall and having the prescribed width in the circumferential direction; a third inlet formed in the second end wall and facing the other end of the first flow path; a fourth inlet formed in the second end wall, located outside the third inlet in the radial direction, and facing the other end of the second flow path; A pair of second side walls extending from one end and the other end of the first end wall in the circumferential direction to the bottom wall in the axial direction, respectively, and standing in the radial direction and facing each other across the first width in the circumferential direction; An exhaust port formed in the second side wall; a second bottom wall located between the pair of second side walls, extending from an end of the second end wall on the open end side to the bottom wall in the axial direction; A third partition wall located between the pair of second side walls, extending from the second end wall to the bottom wall in the axial direction, and facing the second bottom wall with a space therebetween in the radial direction; a second top wall located between the pair of second side walls, extending from an end portion of the second end wall on the projecting side to the bottom wall in the axial direction, and facing the second partition wall with a gap therebetween in the radial direction; a third outlet formed in the second bottom wall and located adjacent to the bottom wall; a second flow port formed in the third partition wall and facing the third inflow port, and A fourth partition wall located between the second bottom wall and the second partition wall, having one end connected to the second bottom wall between the exhaust port and the third outflow port, and the other end connected to the third partition wall between the exhaust port and the second outflow port, An external air flow path connecting the third inlet port and the exhaust port is formed through the second bottom wall, the third partition wall, the pair of second side walls, and the fourth partition wall, An internal gas flow path connecting the fourth inflow port and the third outflow port is formed by the third partition wall, the fourth partition wall, the second top wall, and the pair of second side walls.
3. The rotary electric machine according to claim 2, further comprising: a first bearing provided on the bottom wall of the first bracket; A second bearing provided on the bottom wall of the second bracket; A rotor having a rotary shaft rotatably supported by the first bearing and the second bearing about a central axis and disposed coaxially with the stator, and a rotor core mounted on the rotary shaft and disposed coaxially inside the stator core; A first fan mounted to the rotary shaft between the first bearing and the rotor core and rotatable integrally with the rotary shaft, and A second fan mounted to the rotary shaft between the second bearing and the rotor core and rotatable integrally with the rotary shaft, The first fan has a fan body fixed to the rotary shaft, a plurality of outer blades fixed to the rotary shaft, an inner space of the first bracket divided into an outer space located between the bottom wall and the first fan and communicated with the first inlet and an air inlet provided in the bottom wall, and an inner space located between the stator core and the rotor core and the first fan and communicated with the second inlet, and a plurality of inner blades located on an outer surface of the fan body and located in the outer space, and a plurality of inner blades located on an inner surface of the fan body and located in the inner space.
4. The rotating electrical machine according to claim 3, wherein, The second fan is provided with a fan main body and a plurality of outer blades, the fan main body is fixed on the rotating shaft, the inner space of the second bracket is divided into an outer space which is positioned between the bottom wall and the second fan and communicated with an air inlet arranged on the bottom wall, and an inner space which is positioned between the stator iron core and the rotor iron core and the second fan and communicated with the third outlet, and the outer blades are arranged on the outer surface of the fan main body and positioned in the outer space.
5. The rotating electrical machine according to claim 1, wherein, The stator core is a laminated core in which a plurality of magnetic steel plates are laminated in a concentric manner, and the first flow path forming portion has ribs integrally formed on an outer peripheral edge of each magnetic steel plate, the ribs including a main rib extending radially outward from the outer peripheral edge of the magnetic steel plate and defining the first flow path between the main rib and the outer peripheral edge, a plurality of first rectifying ribs extending between the main rib and the outer peripheral edge and being provided so as to be separated from each other in a circumferential direction, and a plurality of second rectifying ribs extending radially outward from an outer edge of the main rib.
6. The rotating electrical machine according to claim 5, wherein, The first rectifying rib is located in the first flow path and forms a rectifying plate extending from one end to the other end in the axial direction of the stator core.
7. The rotating electrical machine according to claim 6, wherein, The first flow path forming part includes a cover plate fixed to an outer peripheral surface of the stator core and covering the ribs, the second flow path is defined between an outer edge of the main rib and an inner surface of the cover plate, and the second rectifying rib is located in the second flow path, and forms a rectifying plate extending from one end to the other end in an axial direction of the stator core.

Description

Rotary electric machine Citation of related applications such as priority base application The present application is based on Japanese patent application 2021-153136 (filing date: 2021, 9, 21) which claims the benefit of priority of this application. The present application is incorporated by reference into this application in its entirety. Technical Field Embodiments described herein relate to rotating electrical machines. Background In recent years, a permanent magnet type rotary electric machine has been proposed in which permanent magnets are arranged on magnetic poles of a rotor. Further, the rotary electric machine for driving the vehicle is required to be miniaturized and to have a high output. With the increase in output, the temperature rise of the stator coil and the permanent magnet may become a problem. Therefore, it is necessary to enhance the cooling performance of the rotating electrical machine. Disclosure of Invention An object of an embodiment of the present invention is to provide a rotating electrical machine with improved cooling performance. According to an embodiment, a rotating electrical machine includes a stator including a cylindrical stator core having a first end face located at one end in an axial direction, a second end face located at the other end in the axial direction, and an outer peripheral surface, a stator coil attached to the stator core, and a first channel forming portion provided on an outer periphery of the stator core, the first channel forming portion being formed with a first channel extending from one end to the other end in the axial direction of the stator core, and a second channel located outside the first channel in a radial direction of the stator core and extending from one end to the other end in the axial direction of the stator core, a first bracket including an annular peripheral wall having an open end opposed to the first end face, a bottom wall opposed to the first end face at a spacing, and a second channel forming portion formed of a portion of the peripheral wall, and a second bracket including an annular peripheral wall having an open end opposed to the second end face, and a bottom wall opposed to the second end face at a spacing. The second flow path forming part of the first bracket includes a first end wall extending radially from the opening end of the peripheral wall and having a circumferential width, a pair of first side walls extending from one end and the other end of the first end wall in the circumferential direction to the bottom wall in the axial direction, respectively, and standing in the radial direction, And are opposed to each other at intervals in the circumferential direction; a first bottom wall located between the pair of first side walls, extending from an end of the first end wall on the open end side in the axial direction to the bottom wall, and having the first width in the circumferential direction; the first flow channel includes a pair of first side walls extending in the axial direction from the first end wall to the bottom wall and having a first width in the circumferential direction, a first top wall located between the pair of first side walls and having a first width in the circumferential direction from an end of the first end wall on the projecting side to the bottom wall and having a first width in the circumferential direction, a first flow outlet formed on the first end wall and having a predetermined width in the circumferential direction and opposed to one end of the first flow channel, a second flow outlet formed on the first end wall and having a predetermined width in the circumferential direction and opposed to one end of the second flow channel, a first flow inlet formed on the first bottom wall and located adjacent to the bottom wall and having a first width in the circumferential direction, a second flow inlet formed on the first bottom wall and opposed to the first flow channel and having a second width in the circumferential direction and a second flow channel width smaller than the first flow channel, a first flow inlet formed on the first side of the first end wall and having a second flow channel and a second flow channel, having one end connected to the first bottom wall and located around the second inflow port, And the other end is connected with the first partition wall and positioned around the circulation port. An external air flow path connecting the first inlet and the first outlet is formed by the first bottom wall, the first partition wall, the pair of first side walls, and the second partition wall, and an internal air flow path connecting the second inlet and the second outlet is formed by the first partition wall, the first top wall, the pair of first side walls, and the second partition wall. Drawings Fig. 1 is a perspective view showing an external appearance of a rotary electric machine according to an embodiment. Fig. 2 is an exploded perspective view of the rot