CN112421818B

CN112421818B - stator core

Info

Publication number: CN112421818B
Application number: CN202010840334.5A
Authority: CN
Inventors: 金田和弥
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2019-08-21
Filing date: 2020-08-19
Publication date: 2023-11-28
Anticipated expiration: 2040-08-19
Also published as: JP2021035115A; CN112421818A

Abstract

Provided is a stator core which can be cooled effectively while suppressing an increase in manufacturing cost of the stator core. The stator core (10) is configured by laminating a plurality of steel plates (11), and is provided with an annular stator core body (12) and a plurality of stator core fixing sections (13). The steel plate has a pair of stator core fixing sections (13A, 13B) formed by a pair of circumferentially adjacent stator core fixing sections, the pair of stator core fixing sections (13B) has an intermediate wall (22), and the pair of stator core fixing sections (13A) has an intermediate wall (21) having a shape different from that of the intermediate wall. A stator core is constituted by displacing laminated steel plates so that a stator core fixing portion pair (13A) and a stator core fixing portion pair (13B) overlap each other, and a cooling medium storage portion (16) for storing a cooling medium (R) is provided on an outer peripheral surface (22 a) of an intermediate wall (21) and an intermediate wall disposed between the intermediate walls (21).

Description

Stator core

Technical Field

The present invention relates to a stator core of a rotating electrical machine.

Background

The stator of the rotating electric machine is configured by winding a winding around a stator core. The temperature of the stator increases due to heat generated by copper loss, eddy current loss, and the like during operation of the rotating electrical machine. Therefore, a method is known in which a cooling medium such as a cooling oil is dropped from a cooling medium supply pipe onto the outer peripheral surface of the stator core to cool the same. In the cooling method in which the cooling medium is dropped to cool, in some cases, when the cooling medium immediately flows down from the outer peripheral surface of the stator core and the cooling medium is not uniformly diffused to the outer peripheral surface of the stator core, a sufficient cooling effect may not be obtained.

Patent document 1 describes a technique in which a protruding portion having a through hole through which a stator fixing material passes and a notch that opens the through hole in the circumferential direction is provided in a laminated plate constituting a stator, and the opening directions of the notches of adjacent laminated plates are made different in the circumferential direction in a state where the through holes of a plurality of laminated plates are communicated.

Patent document 2 describes a technique in which a cooling medium storage portion for storing a cooling medium is provided in a region defined by a pair of stator core fixing portions located above a stator core main body and an outer peripheral surface of the stator core main body sandwiched by the pair of stator core fixing portions.

Prior art literature

Patent document 1: japanese patent laid-open No. 2013-135539

Patent document 2: japanese patent laid-open No. 2019-009967

Problems to be solved by the invention

However, in patent document 1, the cooling medium immediately flows down from the outer peripheral surface of the stator core, and a sufficient cooling effect may not be obtained. In addition, the movement of the flow of the cooling medium in the axial direction is difficult to flow mainly in the circumferential direction, and there is room for improvement.

Further, in the above-described patent document 2, although the cooling medium can easily flow on the outer peripheral surface of the stator in the circumferential direction, a plurality of types of steel plates are required to form the stator core. Therefore, in patent document 2, a plurality of kinds of steel plate punching dies and the like are required, and the manufacturing cost of the stator may be increased.

Disclosure of Invention

The invention provides a stator core which can be effectively cooled while suppressing the increase of the manufacturing cost of the stator core.

Means for solving the problems

The present invention relates to a stator core of a rotating electrical machine, comprising:

an annular stator core body; and

a plurality of stator core fixing portions protruding radially outward from an outer peripheral surface of the stator core main body, wherein,

the stator core is formed by laminating a plurality of steel plates,

the steel plate is provided with at least two groups of adjacent pairs of stator core fixing parts along the circumferential direction in the circumferential direction,

the first set of stator core fixation portion pairs has a first intermediate wall between the stator core fixation portion pairs,

a second group of stator core fixing section pairs has a second intermediate wall of a different shape from the first intermediate wall between the stator core fixing section pairs,

forming the stator core by displacing and laminating the plurality of steel plates in such a manner that the first group of stator core fixing part pairs overlap with the second group of stator core fixing part pairs,

a cooling medium storage portion for storing cooling medium is provided on an outer peripheral surface of the second intermediate wall and the first intermediate wall disposed between the second intermediate walls, the second intermediate wall being opposed to each other in the stacking direction.

Effects of the invention

According to the present invention, the stator core can be cooled effectively while suppressing an increase in manufacturing cost of the stator core.

Drawings

Fig. 1 is a perspective view of a stator core of a first embodiment.

Fig. 2 is a front view of a steel plate constituting the stator core of the first embodiment.

Fig. 3 is an explanatory diagram showing a case where the steel plates shown in fig. 2 are stacked in a shifted manner to construct the stator core according to the first embodiment.

Fig. 4 is a cross-sectional view of the stator core of the first embodiment.

Fig. 5 is a cross-sectional view of the vicinity of the cooling medium reservoir of the stator core of the first embodiment.

Fig. 6 is a perspective view of a stator core of the second embodiment.

Fig. 7 is a front view of a steel plate constituting the stator core of the second embodiment.

Fig. 8 is a perspective view of the vicinity of the cooling medium reservoir of the stator core according to the first modification of the second embodiment.

Fig. 9 is a perspective view of the vicinity of the cooling medium reservoir of the stator core according to the second modification of the second embodiment.

Reference numerals illustrate:

10. 30 stator core

10u, 30u upper surface

11. 31 steel plate

12. 32 stator core body

13. 33 stator core fixing part

13A, 13B, 13C, 33A, 33B, 33C stator core fixing part pairs

16. 36 cooling medium storage portion

20a, 20b cooling medium supply pipe

21. 22, 23, 41, 42, 43 intermediate walls

21a, 22a, 23a, 41a, 42a, 43a, respectively

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the stator core according to each embodiment, a direction orthogonal to the up-down direction (vertical direction) is referred to as a horizontal direction, and two directions orthogonal to the horizontal direction are referred to as a front-back direction and a left-right direction. In the drawings, the front side of the stator core is denoted Fr, the rear side thereof is denoted Rr, the left side thereof is denoted L, the right side thereof is denoted R, the upper side thereof is denoted U, and the lower side thereof is denoted D, but these directions may be different from those in which the stator core is mounted on a vehicle or the like.

(first embodiment)

First, a first embodiment of the present invention will be described. As shown in fig. 1, a stator core 10 of a rotating electrical machine according to a first embodiment is configured by stacking a plurality of steel plates 11 such as electromagnetic steel plates in a left-right direction (hereinafter, also referred to as a stacking direction), and includes a substantially annular stator core body 12 and six stator core fixing portions 13 protruding radially outward from an outer peripheral surface of the stator core body 12.

The stator core fixing portions 13 are each provided with a bolt through hole 14, and bolts for fixing the stator core 10 to a housing (not shown) or the like are inserted into the bolt through holes 14. Further, a plurality of slots 15 cut from the radially inner side toward the radially outer side are provided at equal intervals in the circumferential direction in the inner peripheral portion of the stator core main body 12. A stator of the rotating electric machine is constituted by the stator core 10 and coils (not shown) provided in the slots 15.

A coolant reservoir 16 is provided on an upper surface 10u of the outer peripheral surface of the stator core 10, and the coolant reservoir 16 stores a coolant R dropped from a coolant supply pipe 20a provided above the stator core 10. The coolant reservoir 16 is provided at a position on the upper surface 10u that faces the coolant supply pipe 20a in the vertical direction. As a result, the cooling medium R falling from the cooling medium supply pipe 20a by the gravity can be stored in the cooling medium storage portion 16.

The coolant supply pipe 20b is disposed above the stator core 10 and behind the coolant supply pipe 20 a. As will be described later in detail using fig. 4, the cooling medium R dropped from the cooling medium supply pipe 20b flows down on the outer peripheral surface of the stator core 10 in a flow path different from the cooling medium R dropped from the cooling medium supply pipe 20 a. The cooling medium R is a liquid cooling medium such as a cooling oil.

As shown in fig. 2, the stator core 10 is formed of one type of steel plate 11, and the steel plate 11 includes three pairs of stator core fixing portions each formed of a pair of stator core fixing portions 13 in the circumferential direction. Specifically, three pairs of stator core fixing portions, that is, a stator core fixing portion pair 13A, a stator core fixing portion pair 13B, and a stator core fixing portion pair 13C, are provided on the outer peripheral portion of the steel plate 11 in the steel plate 11 so as to be separated by 120 ° in the circumferential direction.

The stator core fixing section pair 13A has a stator core fixing section 13A, a stator core fixing section 13b adjacent to the stator core fixing section 13A, and an intermediate wall 21 between the stator core fixing section 13A and the stator core fixing section 13 b. The intermediate wall 21 is provided so as to protrude radially outward from the outer peripheral surface of the stator core main body 12 between the stator core fixing portion 13a and the stator core fixing portion 13b, and is connected to the stator core fixing portion 13a and the stator core fixing portion 13 b. By connecting the stator core fixing portion 13a, the stator core fixing portion 13b, and the intermediate wall 21, the rigidity thereof can be improved.

The intermediate wall 21 has an outer peripheral surface 21a connecting the stator core fixing portion 13a and the stator core fixing portion 13 b. The outer peripheral surface 21a has a shape obtained by bending a tangential line connecting the stator core fixing portion 13a and the stator core fixing portion 13b to the radial inner side by a distance d1 at a substantially intermediate position in the circumferential direction as viewed in the lamination direction. Here, the distance d1 is determined so that the outer peripheral surface 21a is located above a horizontal virtual line L1 passing through the tangent point Pa of the stator core fixing portion 13 a. Thus, the outer peripheral surface 21a is inclined so as to descend from the stator core fixing section 13b on the upper side to the stator core fixing section 13A on the lower side in the stator core fixing section pair 13A.

Therefore, the outer peripheral surface 21a functions as a cooling medium guide surface that guides the cooling medium R from the stator core fixing portion 13b side to the stator core fixing portion 13a side, so that the cooling medium R on the outer peripheral surface 21a can flow in the circumferential direction. Further, since the outer peripheral surface 21a is located radially inward of the tangent line drawn from the tangent point Pa of the stator core fixing portion 13a to the tangent point Pb of the stator core fixing portion 13b as viewed in the stacking direction, the intermediate wall 21 can be effectively caused to function as the cooling medium storage portion 16 and the cooling medium guide surface while suppressing the intermediate wall 21 from protruding radially outward.

The stator core fixing section pair 13B has a stator core fixing section 13c, a stator core fixing section 13d adjacent to the stator core fixing section 13c, and an intermediate wall 22 between the stator core fixing section 13c and the stator core fixing section 13 d. The intermediate wall 22 is provided so as to protrude radially outward from the outer peripheral surface of the stator core main body 12 between the stator core fixing portion 13c and the stator core fixing portion 13d, and is connected to the stator core fixing portion 13c and the stator core fixing portion 13 d.

The intermediate wall 22 has an outer peripheral surface 22a connecting the stator core fixing portion 13c and the stator core fixing portion 13 d. The outer peripheral surface 22a has a shape obtained by bending a tangential line connecting the stator core fixing portion 13c and the stator core fixing portion 13d to the radial inner side by a distance d2 (however, d2 > d 1) at a substantially intermediate position in the circumferential direction as viewed from the lamination direction. That is, the outer peripheral surface 22a is recessed radially inward of the outer peripheral surface 21a. Therefore, when the laminated steel plates 11 are displaced so that the stator core fixing section pair 13A and the stator core fixing section pair 13B overlap, the end portions of the outer peripheral surface 22a in the lamination direction can be divided by the intermediate wall 21.

The stator core fixing section pair 13C has a stator core fixing section 13e, a stator core fixing section 13f adjacent to the stator core fixing section 13e, and an intermediate wall 23 between the stator core fixing section 13e and the stator core fixing section 13 f. The intermediate wall 23 connects the stator core fixing portion 13e and the stator core fixing portion 13f, and has the same shape as the intermediate wall 22. That is, the outer peripheral surface 23a of the intermediate wall 23 has a shape obtained by bending a tangential line connecting the stator core fixing portion 13e and the stator core fixing portion 13f to the radial inner side by a distance d2 at a substantially intermediate position in the circumferential direction, and the outer peripheral surface 23a of the outer peripheral surface 23a is recessed radially inward from the outer peripheral surface 21a, as with the outer peripheral surface 22a of the intermediate wall 22.

Therefore, when the laminated steel plates 11 are displaced so that the stator core fixing section pair 13A overlaps the stator core fixing section pair 13C, the end portions of the outer peripheral surface 23A in the lamination direction can be divided by the intermediate wall 21. Further, the outer peripheral surface 22a and the outer peripheral surface 23a have the same shape, and therefore, when the laminated steel plates 11 are displaced so that the stator core fixing section pair 13B overlaps the stator core fixing section pair 13C, the outer peripheral surface 22a and the outer peripheral surface 23a form continuous surfaces in the lamination direction.

In the first embodiment, the phase of the steel plate 11 shown in fig. 2, that is, the phase of the stator core fixing portion 13b located substantially directly above the center (rotation axis of the rotor) CL of the stator core 10 is hereinafter referred to as "phase α". Further, a phase obtained by rotating the steel plate 11 by 120 ° clockwise from the phase α is referred to as "phase β", and a phase obtained by rotating the steel plate 11 by 120 ° further clockwise from the phase β is referred to as "phase γ".

As shown in fig. 3, the stator core 10 is configured by stacking nine groups of steel plates 11 in order of phase γ, phase α, phase β, phase γ, phase α, and phase β, with shifting from right to left. The group of steel plates 11 may be constituted by one steel plate 11, but is preferably constituted by a plurality of steel plates 11. Thus, as shown in fig. 1, two cooling medium storage portions 16, namely, a cooling medium storage portion 16a and a cooling medium storage portion 16b, are formed on the upper surface 10u of the stator core 10.

More specifically, referring to fig. 1, the cooling medium storage portion 16a is formed with the intermediate wall 21 of the second and fifth groups of steel plates 11 from the right as a side wall in the stacking direction, and with the outer peripheral surface 23a of the third group of steel plates 11 and the outer peripheral surface 22a of the fourth group of steel plates 11 from the right as side walls and bottom surfaces in the circumferential direction. By disposing the plurality of intermediate walls 22 and 23 between the intermediate walls 21 facing each other in the stacking direction in this way, the cooling medium storage portion 16 formed of these can be enlarged in the stacking direction, and the amount of the cooling medium R that can be stored in the cooling medium storage portion 16 can be increased.

Similarly, the coolant reservoir 16b is formed with the intermediate wall 21 of the fifth and eighth groups of steel plates 11 from the right as a side wall in the stacking direction, and with the outer peripheral surface 23a of the sixth group of steel plates 11 from the right and the outer peripheral surface 22a of the seventh group of steel plates 11 as side walls and bottom surfaces in the circumferential direction.

As shown in fig. 4, the cooling medium R that has dropped from the cooling medium supply pipe 20a to the cooling medium storage portion 16 is stored in the cooling medium storage portion 16 until exceeding the virtual line L1. The cooling medium R stays in the cooling medium storage portion 16 for a certain time, and heat is transferred between the cooling medium R and the stator core 10, so that the stator core 10 can be cooled effectively.

When the cooling medium R stored in the cooling medium storage portion 16 exceeds the virtual line L1, the cooling medium flows in the circumferential direction from the upper surface 10u toward the front side surface 10f of the stator core 10 over the stator core fixing portion 13x adjacent to the front side of the cooling medium storage portion 16 as indicated by an arrow a 11. The cooling medium R flowing from the upper surface 10u toward the front side surface 10f can efficiently cool from the upper surface 10u to the front side surface 10 f.

The cooling medium R that has dropped onto the outer peripheral surface 21a forming the side wall of the cooling medium reservoir 16 in the stacking direction is guided by the outer peripheral surface 21a from the stator core fixing portion 13y side toward the stator core fixing portion 13x side, passes over the stator core fixing portion 13x, and flows in the circumferential direction from the upper surface 10u toward the front side surface 10 f. Here, the stator core fixing portion 13y is a stator core fixing portion 13 adjacent to the stator core fixing portion 13x and located above the stator core fixing portion 13 x.

On the other hand, the cooling medium R dropped from the cooling medium supply pipe 20b flows in the circumferential direction from the upper surface 10u toward the rear side surface 10R of the stator core 10 without being stored in the cooling medium storage portion 16 as indicated by an arrow a 12. That is, the cooling medium R dropped from the cooling medium supply pipe 20b flows down on the opposite side in the circumferential direction of the outer circumferential surface of the stator core 10 from the cooling medium R dropped from the cooling medium supply pipe 20 a. The cooling medium R flowing in the circumferential direction from the upper surface 10u toward the rear side surface 10R can efficiently cool from the upper surface 10u to the rear side surface 10R.

As described above, according to the stator core 10, the cooling medium storage portion 16 is provided by the intermediate walls 21 facing each other in the lamination direction and the outer peripheral surfaces 22a, 23a of the intermediate walls 22, 23 disposed between the intermediate walls 21 by stacking one type of steel plates 11 by displacement. Thereby, the stator core 10 can be cooled by the cooling medium R stored in the cooling medium storage portion 16. In addition, the cooling medium R overflowed from the cooling medium storage portion 16 can flow in the circumferential direction on the outer peripheral surface of the stator core 10, and the entire stator core 10 can be cooled effectively. Further, since such a stator core 10 can be formed of the single type of steel plate 11, the number of types of punching dies required for manufacturing the stator core 10 can be reduced, and an increase in manufacturing cost of the stator core 10 can be suppressed. That is, according to the stator core 10, the stator core 10 can be cooled effectively while suppressing an increase in manufacturing cost of the stator core 10.

Further, according to the stator core 10, the outer peripheral surface 21a of the side wall in the lamination direction forming the cooling medium reservoir 16 is inclined so as to rise from the stator core fixing portion 13x side toward the stator core fixing portion 13y side. Therefore, according to the stator core 10, as shown in fig. 5 (a), even if the stator core 10 is inclined to some extent in the circumferential direction due to the vehicle on which the stator core 10 is mounted ascending, the angle of the outer peripheral surface 21a as viewed from the lamination direction can be maintained at a level or more. Therefore, the coolant R stored in the coolant storage section 16 can be restrained from overflowing from the coolant storage section 16 beyond the intermediate wall 21 in the stacking direction. Further, according to the stator core 10, even when the cooling medium R in the cooling medium storage portion 16 is biased toward the stator core fixing portion 13y side due to inertia at the time of starting the vehicle on which the stator core 10 is mounted, as shown in fig. 5 (B), it is possible to suppress the cooling medium R stored in the cooling medium storage portion 16 from overflowing from the cooling medium storage portion 16 beyond the intermediate wall 21 in the stacking direction.

(second embodiment)

Next, a second embodiment of the present invention will be described. In the following second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. As shown in fig. 6, a stator core 30 of a rotating electrical machine according to a second embodiment of the present invention is configured by stacking a plurality of steel plates 31 such as electromagnetic steel plates in the left-right direction, and includes a substantially annular stator core main body 32 and six stator core fixing portions 33 protruding radially outward from the outer peripheral surface of the stator core main body 32. In fig. 6 to 9, slots of the stator core 30 are omitted.

A coolant reservoir 36 is provided on the upper surface 30u of the outer peripheral surface of the stator core 30, and the coolant reservoir 36 is used to store a coolant R that is dropped from a coolant supply pipe (not shown) provided above the stator core 30. The coolant reservoir 36 is provided at a position on the upper surface 30u that faces the coolant supply pipe in the vertical direction. Thereby, the cooling medium R falling from the cooling medium supply pipe due to gravity can be stored in the cooling medium storage portion 36.

As shown in fig. 7, the stator core 30 is formed of one type of steel plate 31, and the steel plate 31 includes three pairs of stator core fixing portions each formed of a pair of stator core fixing portions 33 in the circumferential direction. Specifically, three pairs of stator core fixing portions, that is, a pair of stator core fixing portions 33A, a pair of stator core fixing portions 33B, and a pair of stator core fixing portions 33C, are provided on the outer peripheral portion of the steel plate 31 in a state of being separated by 120 ° in the circumferential direction, respectively, in the steel plate 31.

The stator core fixing section pair 33A has a stator core fixing section 33A, a stator core fixing section 33b adjacent to the stator core fixing section 33A, and an intermediate wall 41 between the stator core fixing section 33A and the stator core fixing section 33 b. The intermediate wall 41 is provided so as to protrude radially outward from the outer peripheral surface of the stator core main body 32 between the stator core fixing portion 33a and the stator core fixing portion 33b, and is connected to the stator core fixing portion 33 b.

The intermediate wall 41 has an outer peripheral surface 41a when viewed in the lamination direction, and the outer peripheral surface 41a connects the outer peripheral surface of the stator core main body 32 between the stator core fixing section 33a and the stator core fixing section 33b substantially horizontally to the upper end portion of the stator core fixing section 33 b. Thus, the outer peripheral surface 41a functions as a cooling medium guide surface that guides the cooling medium R from the stator core fixing portion 33a side to the stator core fixing portion 33b side, so that the cooling medium R on the outer peripheral surface 41a can flow in the circumferential direction.

Further, since the outer peripheral surface 41a is a tangential line drawn from the stator core fixing portion 33b to the outer peripheral surface of the stator core main body 32 between the stator core fixing portion 33a and the stator core fixing portion 33b as viewed in the lamination direction, the intermediate wall 41 can be effectively caused to function as the cooling medium storage portion 36 and the cooling medium guide surface while suppressing the intermediate wall 41 from protruding radially outward. Further, since the outer peripheral surface 41a is a tangential line drawn from the upper end portion of the stator core fixing portion 33b toward the outer peripheral surface of the stator core main body 32 between the stator core fixing portion 33a and the stator core fixing portion 33b as viewed in the lamination direction, the coolant R in the coolant reservoir 36 can be suppressed from overflowing in the lamination direction.

The stator core fixing section pair 33B has a stator core fixing section 33c, a stator core fixing section 33d adjacent to the stator core fixing section 33c, and an intermediate wall 42 between the stator core fixing section 33c and the stator core fixing section 33 d. The intermediate wall 42 constitutes an outer peripheral portion of the stator core body 32. That is, the outer peripheral surface 42a of the intermediate wall 42 is the outer peripheral surface of the stator core main body 32 between the stator core fixing portion 33c and the stator core fixing portion 33 d.

The stator core fixing section pair 33C has a stator core fixing section 33e, a stator core fixing section 33f adjacent to the stator core fixing section 33e, and an intermediate wall 43 between the stator core fixing section 33e and the stator core fixing section 33 f. Like the intermediate wall 42, the intermediate wall 43 constitutes an outer peripheral portion of the stator core main body 32. That is, the outer peripheral surface 43a of the intermediate wall 43 is the outer peripheral surface of the stator core main body 32 between the stator core fixing portion 33e and the stator core fixing portion 33 f.

In the second embodiment, the phase of the steel plate 31 shown in fig. 7, that is, the phase of the stator core fixing portion 33a located substantially directly above the center (rotation axis of the rotor) CL of the stator core 30 is hereinafter referred to as "phase α". The phase obtained by rotating the steel plate 31 clockwise by 120 ° from the phase α is referred to as "phase β", and the phase obtained by rotating the steel plate 31 further clockwise by 120 ° from the phase β is referred to as "phase γ".

As shown in fig. 6, the stator core 30 is configured by stacking ten sets of steel plates 31 in a shifted manner so that the steel plates 31 of the phase α are arranged on both sides in the stacking direction. Specifically, the stator core 30 is formed by stacking ten sets of steel plates 31 in the order of phase α, phase β, phase γ, and phase α, with a shift from right to left. The group of steel plates 31 may be constituted by one steel plate 31, but is preferably constituted by a plurality (for example, ten) of steel plates 31. As a result, as shown in fig. 6, three coolant storage sections 36, that is, a coolant storage section 36a, a coolant storage section 36b, and a coolant storage section 36c, are formed on the upper surface 30u of the stator core 30.

According to the stator core 30, a part of the cooling medium R that drops from the cooling medium supply pipe to the upper surface 30u of the stator core 30 is stored in the cooling medium storage portion 36 as indicated by arrow a 21. When the cooling medium storage 36 is filled with the cooling medium R, the cooling medium R flows in the circumferential direction from the upper surface 30u toward the front side surface 30f of the stator core 30 over the stator core fixing portion 33 adjacent to the cooling medium storage 36. The cooling medium R flowing in the circumferential direction from the upper surface 30u toward the front side 30f can be efficiently cooled from the upper surface 30u to the front side 30 f.

Further, according to the stator core 30, the other portion of the cooling medium R that drops from the cooling medium supply pipe to the upper surface 30u is not stored in the cooling medium storage portion 36 as indicated by the arrow a22, but directly flows along the outer peripheral surface 41a over the stator core fixing portion 33 and toward the front side surface 30f in the circumferential direction. The cooling medium R can be cooled effectively from the upper surface 30u to the front side surface 30 f.

Preferably, the cooling medium R is dropped onto the stator core 30 through a cooling medium supply pipe different from the cooling medium supply pipe, and the illustration and detailed description are omitted. This allows the cooling medium R to flow from the upper surface 30u to the rear surface opposite to the front surface 30f in the circumferential direction, and the cooling medium R can efficiently cool from the upper surface 30u to the rear surface.

As described above, by configuring the stator core 30 by disposing the steel plates 31 of the phase α on both sides in the lamination direction, the coolant R dripping onto the stator core 30 can be suppressed from overflowing in the lamination direction. That is, the amount of the cooling medium R overflowing in the lamination direction among the cooling mediums R dropped to the stator core 30 can be reduced, and accordingly, the cooling medium R flowing in the circumferential direction among the cooling mediums R dropped to the stator core 30 can be increased.

In the second embodiment, the steel plates 31 are stacked in the order of phase α, phase β, phase γ, and phase α, but the present invention is not limited to this. For example, the steel plates 31 may be stacked in the order of phase α, phase γ, phase β, and phase α, with a shift from right to left. In the above-described example, for example, the front side and the rear side of the stator core 30 may be interchanged.

(first modification)

Next, a first modification of the second embodiment will be described. As shown in fig. 8, in the first modification, in the stator core 30 of the second embodiment, the number of laminations of the steel plates 31 in the phase α on both sides in the lamination direction is reduced. Specifically, in the stator core 30 of the first modification, the steel plates 31 of the phase α are disposed one on each side in the lamination direction, and the respective groups of the steel plates 31 are disposed therebetween in the same phase and number as those of the second embodiment.

That is, the stator core 30 of the first modification is configured by stacking the steel sheet 31 of one phase α, the steel sheet 31 of ten phases β, the steel sheet 31 of ten phases γ, the first and second steel sheets 31 of one phase α, and shifting them from the right to the left. Thus, three coolant reservoirs 36 are formed on the upper surface 30u of the stator core 30 in the same manner as in the second embodiment.

According to the stator core 30 of the first modification described above, by reducing the number of intermediate walls 41 stacked on both sides in the stacking direction, the intermediate walls 41 can be thinned, and the coolant R flowing out along the outer peripheral surface 41a of the intermediate wall 41 can be reduced. Accordingly, it is possible to further reduce the coolant R overflowing in the lamination direction among the coolant R dropped to the stator core 30, and accordingly, increase the coolant R flowing in the circumferential direction among the coolant R dropped to the stator core 30. Further, according to the stator core 30 of the first modification, by increasing the number of intermediate walls 41 laminated except for both sides in the lamination direction, the intermediate walls 41 can be thickened, the cooling medium guide surface formed by the outer peripheral surface 41a of the intermediate wall 41 can be widened in the lamination direction, and the amount of the cooling medium R flowing in the circumferential direction along the cooling medium guide surface can be ensured.

(second modification)

Next, a second modification of the second embodiment will be described. As shown in fig. 9, the stator core 30 of the second modification is configured by disposing the steel plates 31 of the phase α only on both sides in the lamination direction in the stator core 30 of the above-described second embodiment. According to the stator core 30 of the second modification example described above, the coolant reservoir 36 that can store a larger amount of the coolant R can be provided, and the stator core 30 can be efficiently cooled by the coolant R.

While the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and modifications, improvements, and the like can be appropriately made.

For example, in the first and second embodiments described above, the three stator core fixing section pairs 13A to 13C and 33A to 33C are provided by the six stator core fixing sections 13 and 33, but the present invention is not limited thereto. For example, two pairs of stator core fixing sections may be provided by four stator core fixing sections. In this case, the pairs of stator core fixing portions may be arranged 180 ° apart in the circumferential direction. In addition, N (n.gtoreq.4) stator core fixing portion pairs may be provided. In this case, the stator core fixing sections may be arranged so as to be separated from each other by 360/N ° in the circumferential direction.

In the first and second embodiments described above, only one intermediate wall (intermediate walls 21 and 41) is formed in a different shape from the other intermediate walls and is formed larger than the other intermediate walls, but the present invention is not limited thereto. For example, the intermediate wall 21 may be formed to be largest, the intermediate wall 22 may be formed to be smallest, and the intermediate wall 23 may be formed to be smallest. In the case of such a configuration, the cooling medium reservoir can be provided by stacking the intermediate walls 21, 22, and 23 in a displaced manner.

In the first and second embodiments described above, the stator core 10 is constituted by only one type of steel plate 11, but the present invention is not limited thereto, and may include other steel plates having different shapes.

At least the following matters are described in the present specification. Note that, in parentheses, components and the like corresponding to those in the above embodiment are shown, but the present invention is not limited thereto.

(1) A stator core (stator core 10, 30) of a rotating electrical machine is provided with:

an annular stator core body (stator core bodies 12, 32); and

a plurality of stator core fixing portions (stator core fixing portions 13, 33) protruding radially outward from an outer peripheral surface of the stator core main body,

the stator core is formed by laminating a plurality of steel plates (steel plates 11, 31),

the steel plate is provided with at least two pairs of stator core fixing parts (stator core fixing part pairs 13A-13C, 33A-33C) adjacent to each other along the circumferential direction in the circumferential direction,

the first group of stator core fixing section pairs (stator core fixing section pairs 13B, 33B) has a first intermediate wall (intermediate wall 22, 42) between the stator core fixing section pairs,

the second group of stator core fixing section pairs (stator core fixing section pairs 13A, 33A) has a second intermediate wall (intermediate wall 21, 41) of a different shape from the first intermediate wall between the stator core fixing section pairs,

the outer peripheral surfaces (outer peripheral surfaces 21a, 41 a) of the second intermediate wall and the first intermediate wall disposed between the second intermediate wall, which are opposed to each other in the stacking direction, are provided with cooling medium storage portions (cooling medium storage portions 16, 36) for storing cooling medium.

According to (1), a plurality of steel plates are stacked in a shifted manner so that the first group of stator core fixing portion pairs and the second group of stator core fixing portion pairs overlap, and the cooling medium storage portion is provided by the outer peripheral surface of the second intermediate wall facing in the stacking direction and the first intermediate wall disposed between the second intermediate walls, whereby the stator core can be cooled effectively even when the stator core is constituted by one type of steel plate.

(2) The stator core of a rotary electric machine according to (1), wherein,

a plurality of the first intermediate walls are arranged between the second intermediate walls facing each other in the stacking direction.

According to (2), since the plurality of first intermediate walls are arranged between the second intermediate walls facing each other in the lamination direction, the stator core can be cooled more effectively by the cooling medium stored in the cooling medium storage portion large in the lamination direction.

(3) The stator core of a rotary electric machine according to (1) or (2), wherein,

the second intermediate wall protrudes outward in the radial direction from the outer periphery of the stator core main body between the second group of stator core fixing part pairs and is connected to at least one of the stator core fixing part pairs,

a cooling medium guide surface that guides the cooling medium in the circumferential direction is constituted by an outer peripheral surface of the second intermediate wall.

According to (3), the cooling medium guide surface is formed by the outer peripheral surface of the second intermediate wall, so that the cooling medium can be guided downward in the circumferential direction from at least one of the stator core fixing sections by the cooling medium guide surface.

(4) The stator core of a rotary electric machine according to (3), wherein,

the cooling medium guide surface is configured by laminating a plurality of the second intermediate walls.

According to (4), the cooling medium guide surface is configured by stacking a plurality of second intermediate walls, and therefore, more cooling medium can be guided in the circumferential direction by the cooling medium guide surface.

(5) The stator core of a rotary electric machine according to (3) or (4), wherein,

the outer peripheral surface of the second intermediate wall constituting the cooling medium guide surface is a tangential line drawn from one of the stator core fixing section pairs of the second group or the other of the stator core fixing section pairs or the outer peripheral surface of the stator core main body between the stator core fixing section pairs, as viewed in the lamination direction.

According to (5), the outer peripheral surface of the second intermediate wall constituting the coolant guiding surface becomes a tangent line drawn from the other of the pair of stator core fixing sections or the outer peripheral surface of the stator core main body between the pair of stator core fixing sections in one direction of the pair of stator core fixing sections as viewed in the lamination direction, and therefore, the second intermediate wall can be effectively caused to function as the coolant storage section and the coolant guiding surface while suppressing the second intermediate wall from protruding radially outward.

(6) The stator core of a rotary electric machine according to (5), wherein,

the tangential line is a line drawn from an upper end portion of one of the pair of stator core fixing portions of the second group toward the other of the pair of stator core fixing portions located above the upper end portion or toward an outer peripheral surface of the stator core main body between the pair of stator core fixing portions, as viewed in the lamination direction.

According to (6), the outer peripheral surface of the second intermediate wall constituting the cooling medium guide surface is a tangential line drawn from the upper end portion of one of the pair of stator core fixing portions of the second group to the outer peripheral surface of the stator core main body located above the other of the pair of stator core fixing portions or between the pair of stator core fixing portions, as viewed in the lamination direction, so that the cooling medium in the cooling medium reservoir portion can be suppressed from overflowing in the lamination direction.

(7) The stator core of a rotary electric machine according to any one of (1) to (6), wherein,

the coolant reservoir is provided so as to face the coolant supply unit located above the stator core in the up-down direction.

According to (7), the cooling medium supply portion and the cooling medium storage portion are provided so as to face each other in the up-down direction, and therefore, the cooling medium dropped from the cooling medium supply portion can be stored in the cooling medium storage portion.

(8) The stator core of a rotary electric machine according to any one of (1) to (7), wherein,

one of the second intermediate walls facing each other in the stacking direction is disposed on an end side in the stacking direction, and the other is disposed on a center side in the stacking direction,

the number of layers stacked by the second intermediate walls arranged on the end side is different from the number of layers stacked by the second intermediate walls arranged on the center side.

According to (8), the number of layers of the second intermediate walls on the end side in the stacking direction is different from the number of layers of the second intermediate walls on the center side in the stacking direction, and therefore, the number of layers of the second intermediate walls on the end side can be reduced (thinned), and the coolant flowing out along the outer peripheral surface of the second intermediate wall can be reduced.

Claims

1. A stator core of a rotating electrical machine is provided with:

an annular stator core body; and

the stator core is formed by laminating a plurality of steel plates,

2. The stator core of a rotary electric machine according to claim 1, wherein,

3. The stator core of a rotary electric machine according to claim 1 or 2, wherein,

4. The stator core of a rotary electric machine according to claim 3, wherein,

5. The stator core of a rotary electric machine according to claim 3 or 4, wherein,

6. The stator core of a rotary electric machine according to claim 5, wherein,

7. The stator core of a rotary electric machine according to any one of claims 1 to 6, wherein,

8. The stator core of a rotary electric machine according to any one of claims 1 to 7, wherein,