WO2022157839A1 - Rotary electrical device and cooling system for rotary electrical device - Google Patents

Abstract

In a rotary electrical device 1, the insides of slots 11b of a stator 10, which is obtained by accommodating a coil 12 in each of the slots 11b, are a first axial direction flow path 19(1) through a third axial direction flow path 19(3) through which coolant flows between one end and the other end of the stator 10. The stator 10 comprises: a circumferential direction connection part 16a, on the one end side, that connects one end of the first axial direction flow path 19(1) to one end of the second axial direction flow path 19(2), that does not connect said one end of the first axial direction flow path 19(1) to one end of the third axial direction flow path 19(3), and that forms a circumferential direction flow path through which the coolant flows between said one end of the first axial direction flow path 19(1) and said one end of the second axial direction flow path 19(2); and a circumferential direction connection part 17a, on the other end side, that connects the other end of the second axial direction flow path 19(2) with the other end of the third axial direction flow path 19(3), that does not connect the other end of the first axial direction flow path 19(1) with said other end of the third axial direction flow path 19(3), and that forms a circumferential direction flow path through which the coolant flows between said other end of the second axial direction flow path 19(2) and said other end of the third axial direction flow path 19(3). The first axial direction flow path 19(1), the circumferential direction connection part 16a on the one end side, the second axial direction flow path 19(2), the circumferential direction connection part 17a on the other end side, and the third axial direction flow path 19(3) are connected in series.

Description

Rotating electric machine and cooling system for rotating electric machine

The present disclosure relates to a rotating electrical machine with a cooling mechanism.

For example, as shown in Patent Literature 1, a rotating electric machine is known that uses the inside of slots of a stator as coolant passages.
That is, in the cooling mechanism in the rotating electrical machine disclosed in Patent Document 1, oil chambers are formed at both ends of the stator in the axial direction, and cooling oil is supplied to one of the oil chambers through an oil supply port. The coolant flows through a coolant passage formed in the stator, is led to the other oil chamber, and is discharged to the outside through an oil discharge port.

Japanese Patent Application Laid-Open No. 2002-186205

In the rotary electric machine disclosed in Patent Document 1, the coolant flows from one oil chamber to the other oil chamber at the same time through all the coolant passages formed in the stator. There was a problem that the cooling for the coil was not sufficient.

The present disclosure has been made in view of the above problems, and an object thereof is to obtain a rotating electrical machine with improved cooling performance for a stator core and coils that constitute a stator.

In the rotating electric machine according to the present disclosure, the inside of each slot of a stator in which a coil is accommodated in each slot is provided between one end and the other end of the stator through which a coolant flows from a first axial flow path to a third axial flow path. A stator is arranged on one end side, connects one end of the first axial flow channel and one end of the second axial flow channel, and connects one end of the first axial flow channel to one end of the first axial flow channel. and one end of the second axial flow path, a circumferential connecting portion on the one end side forming a circumferential flow path through which the coolant flows; and the other end of the third axial flow channel to form a circumferential flow channel through which the coolant flows between the other end of the second axial flow channel and the other end of the third axial flow channel. and a circumferential connection portion on the other end side.

According to the present disclosure, the coolant flows through the axial flow paths formed inside the respective slots of the stator without being distributed with other axial flow paths, thereby improving the cooling performance for the stator core and coils that constitute the stator. do.

1 is a schematic cross-sectional view showing a basic configuration of a rotating electric machine according to Embodiment 1; FIG. 1 is a perspective view showing a stator, an inner rotor, and an outer rotor of a rotary electric machine according to Embodiment 1, and schematically showing a supply hole and a discharge hole; FIG. FIG. 3 is a perspective view schematically showing a circumferential flow path, supply holes, and discharge holes in FIG. 2 excluding resin molded in the stator; FIG. 3 is a sectional view along IV-IV in FIG. 2; FIG. 5 is a partially enlarged view of FIG. 4; FIG. 5 is a side sectional view in FIG. 4; 3 is a cross-sectional view showing one tooth of the stator core in the rotating electric machine according to Embodiment 1; FIG. FIG. 2 is a perspective view showing an insulating member in the rotary electric machine according to Embodiment 1; 3 is a perspective view showing inner wedges and outer wedges in the rotating electric machine according to Embodiment 1. FIG. FIG. 2 is a perspective view of a circumferential connector on one end side of the rotary electric machine according to Embodiment 1, viewed from one end face side of the stator core; FIG. 3 is a cross-sectional view showing a circumferential connector on one end side of the rotary electric machine according to Embodiment 1; FIG. 4 is a diagram schematically showing coolant channels of a cooling mechanism in the rotary electric machine according to Embodiment 1; FIG. 10 is a diagram schematically showing coolant channels of a cooling mechanism in a rotating electric machine according to Embodiment 2; FIG. 10 is a diagram schematically showing coolant flow paths of a cooling mechanism in a rotating electric machine according to Embodiment 3; FIG. 11 is a perspective view of a circumferential connector on one end side of a rotating electric machine according to Embodiment 4, viewed from one end face side of a stator core; FIG. 11 is a cross-sectional view showing a circumferential connector on one end side of a rotary electric machine according to Embodiment 4; FIG. 12 is a cross-sectional view showing a circumferential connector on one end side of the rotary electric machine according to Embodiment 5; FIG. 11 is a perspective view showing an insulating member in a rotating electric machine according to Embodiment 6; FIG. 11 is a cross-sectional view showing a stator, an inner rotor, and an outer rotor in a rotating electric machine according to Embodiment 6; FIG. 20 is a partially enlarged view in FIG. 19; FIG. 11 is a refrigerant cycle diagram showing a cooling system for a rotating electric machine according to Embodiment 7; FIG. 11 is a refrigerating cycle diagram showing a cooling system for a rotating electrical machine according to an eighth embodiment;

Embodiment 1.
A rotating electrical machine 1 according to Embodiment 1 will be described with reference to FIGS. 1 to 12. FIG.
As shown in FIG. 1, the rotary electric machine 1 has a double rotor structure including a stator 10, an inner rotor 20, a shaft 30, an outer rotor 40, a stator holding frame 50, a rotor holding frame 60, and a cooling mechanism. It is a magnet type rotary electric machine.

The stator 10 has an annular shape and is fixed to a stator holding frame 50 at one end.
The inner rotor 20 has an annular shape and is arranged inside the stator 10 with its outer peripheral surface facing the inner peripheral surface of the stator 10 .
The shaft 30 is a rotating shaft and is fitted to the inner rotor 20 with its outer peripheral surface in contact with the inner peripheral surface of the inner rotor 20 at the central portion in the axial direction. It is rotatably held through the

The inner rotor 20 and the shaft 30 have the same central axis, and the shaft 30 passes through the inner rotor 20 along the central axis and is fixed to the shaft 30. The other end of the shaft 30 is a cup-shaped rotor holding frame. It is connected to the center of the bottom surface of 60 .
As the inner rotor 20 rotates, the shaft 30 and the rotor holding frame 60 rotate.

The inner rotor 20 has an inner rotor core 21 and inner permanent magnets 22, as shown in FIGS.
The inner rotor core 21 is formed by stacking a large number of annular thin steel plates in the axial direction (the Z direction in FIG. 2), and is formed into a hollow cylindrical shape as a whole. The steel plate forming the inner rotor core 21 has excellent magnetic properties, namely high magnetic permeability and small iron loss.

The inner rotor core 21 has a plurality of magnet insertion holes, into which the inner permanent magnets 22 are inserted, formed at equal intervals in the circumferential direction.
The inner rotor core 21 has a plurality of stress relaxation holes (not shown) for suppressing breakage due to the action of centrifugal force and a plurality of cooling holes (not shown) for cooling the inner permanent magnets 22 . ing.

A plurality of inner permanent magnets 22 are respectively embedded in a plurality of magnet insertion holes in inner rotor core 21 .
Each of the inner side permanent magnets 22 is a rectangular parallelepiped permanent magnet made of alnico, ferrite, neodymium, or the like.

The outer rotor 40 has an annular shape and is arranged outside the stator 10 with its inner peripheral surface facing the outer peripheral surface of the stator 10 .
As shown in FIG. 1 , the outer rotor 40 is fixed to the rotor holding frame 60 with its outer peripheral surface facing the inner surface of the rotor holding frame 60 .
As the rotor holding frame 60 rotates, the outer rotor 40 rotates.

The outer rotor 40 has an outer rotor core 41 and outer permanent magnets 42, as shown in FIGS.
The outer rotor core 41 is formed by stacking a large number of annular thin steel plates in the axial direction (Z direction), and is formed in a hollow cylindrical shape as a whole. The steel plate forming the outer rotor core 41 has excellent magnetic properties, namely high magnetic permeability and small iron loss.

The outer rotor core 41 has a plurality of magnet insertion holes, into which the outer permanent magnets 42 are inserted, formed at regular intervals in the circumferential direction.
The outer rotor core 41 has therein a plurality of stress relief holes (not shown) for suppressing breakage due to the action of centrifugal force and a plurality of cooling holes (not shown) for cooling the outer permanent magnets 42 . ing.

A plurality of outer permanent magnets 42 are respectively embedded in a plurality of magnet insertion holes in outer rotor core 41 .
Each of the outer permanent magnets 42 is a rectangular parallelepiped permanent magnet made of alnico, ferrite, neodymium, or the like.

As shown in FIGS. 2 to 6, the stator 10 includes a stator core 11, coils 12, an insulating member 13, wedges 14 and 15, and circumferential connectors 16 and 17, and is molded with a resin 18 so as to cover the entire circumference. be.
The stator core 11 is formed by laminating a large number of thin steel plates in the axial direction (Z direction). The steel plate forming the stator core 11 has excellent magnetic properties, namely high magnetic permeability and small iron loss.

The stator core 11 has a plurality of teeth 11a arranged annularly, and slots 11b are provided between adjacent teeth 11a. Stator core 11 is an assembly of a plurality of teeth 11a.
The number of teeth 11a is a value determined by the rotating electric machine, but is set to n for convenience. As shown in FIG. 7, each tooth 11a has a T-shape extending from the outer periphery toward the center, and key-shaped notches 11c into which the side ends of the outer side wedges 14 are inserted on the outer peripheral side of both side surfaces. are formed, and key-shaped cutouts 11d into which the side ends of the inner side wedge 15 are inserted are formed on the inner peripheral sides of both side surfaces.
The notch 11c and the notch 11d are notches communicating from one end of the stator core 11 to the other end.

The coil 12 is wound around each of the plurality of teeth 11a via the insulating member 13 and accommodated in the slot 11b. The conductive wire that constitutes the coil 12 is made of copper having a high electrical conductivity, the surface layer of which is coated with, for example, an enamel coating, and has a circular or rectangular cross-sectional shape.

The insulating member 13 is made of resin, and as shown in FIG. 8, has a cylindrical shape with both ends opened, and has a winding portion 13a and flanges 13b on both outer and inner circumferential sides of the winding portion 13a.
The winding portion 13a of the insulating member 13 is in close contact with both side surfaces and both end surfaces of each tooth 11a to cover both side surfaces and both end surfaces of each tooth 11a. The flange 13b on the circumferential side is in close contact with the notch 11d of each tooth 11a.
The insulating member 13 is interposed between each tooth 11 a and the coil 12 wound around the tooth 11 a to insulate the tooth 11 a and the coil 12 .

If a material with a high thermal conductivity, for example, an insulating material with a thermal conductivity that is 1/10 that of the stator core 11 is selected as the insulating member 13, heat conduction from the stator core 11 to the coils 12 will be good, and the cooling performance of the stator core 11 will be improved. can be done. As a result, the heat transfer from the stator core 11 to the inner rotor 20 and the outer rotor 40 can be suppressed, and the temperature rise of the inner rotor 20 and the outer rotor 40 can be suppressed.
Conversely, if a material with a low thermal conductivity, for example, an insulating material with a thermal conductivity 1/100 that of the stator core 11 is selected as the insulating member 13, heat conduction from the stator core 11 to the coils 12 can be suppressed.
LCP resin (Liquid Crystal Polymer) is used as the insulating member 13 .

As shown in FIG. 9, the outer side wedge 14 has a flat portion 14a, one side end portion 14b processed into a key shape at one side end of the flat portion 14a, and a key shape at the other side end of the flat portion 14a. and a machined other side end 14c.
The outer side wedge 14 is arranged on the outer peripheral side of adjacent and facing teeth 11a, one side end 14b is inserted into the notch 11c of one tooth 11a of the adjacent teeth 11a, and the other side end 14c is adjacent. It is inserted into the notch 11c of the other tooth 11a in the tooth 11a.

The outer wedge 14 closes the opening on the outer peripheral side of the slot 11b between adjacent coils 12 accommodated in the slot 11b.
In order to firmly fix the outer wedge 14 to the stator core 11, the front and back of the flat portion 14a of the outer wedge 14 are covered with the outer resin portion 18a.

As shown in FIG. 9, the inner side wedge 15 has a flat portion 15a, one side end portion 15b processed into a key shape at one side end of the flat portion 15a, and a key shape at the other side end of the flat portion 15a. and a machined other side end 15c.
The inner side wedge 15 is arranged on the inner peripheral side of adjacent and facing teeth 11a, one side end 15b is inserted into the notch 11d of one of the adjacent teeth 11a, and the other side end 15c It is inserted into the notch 11d of the other adjacent tooth 11a.

The inner wedge 15 closes the opening on the inner peripheral side of the slot 11b between adjacent coils 12 accommodated in the slot 11b.
In order to strengthen the fixation of the inner wedge 15 to the stator core 11, the front and back surfaces of the flat portion 15a of the inner wedge 15 are covered with the inner resin portion 18b.

Epoxy glass (glass epoxy) is used as the outer side wedge 14 and the inner side wedge 15 .
The outer-side resin portion 18a and the inner-side resin portion 18b are part of the resin formed by injection of epoxy resin from one end of the stator core 11 and molding.

The inside of each of the slots 11b of the stator 10, which accommodates the coils 12 in each slot 11b, is defined as an axial flow path 19 through which cooling coolant flows between one end and the other end of the stator 10. As shown in FIG. The coolant is an insulating coolant.
The axial flow paths 19 are formed corresponding to the slots 11b, and if the number of teeth 11a is n, the number of slots 11b and the number of axial flow paths 19 are also n.

The axial flow path 19 is defined such that the axial flow path to which the coolant is supplied is the 0th axial flow path 19(0), the first axial flow path 19(1), and the second axial flow path 19(1) in the circumferential direction. The axial flow path 19(2), the third axial flow path 19(3), . and
As shown in FIGS. 4 to 6, each axial flow path 19 includes adjacent coils 12 accommodated in respective slots 11b, outer wedges 14 and outer resin portions 18a, inner wedges 15 and inner This is a space surrounded by the side resin portion 18b.

Each axial flow path 19 is basically a space surrounded by the coil 12, the outer side wedge 14, and the inner side wedge 15, and the outer side resin portion 18a and the inner side resin portion 18b are provided for each axial flow path. It plays an auxiliary role in forming the path 19 .
In order to simplify the explanation, reference numerals in parentheses will be omitted unless the axial flow path 19 needs to be explained separately.

A plurality of axial flow channels 19 from the first axial flow channel 19(1) to the n-2th axial flow channel 19(n-2) connect two adjacent axial flow channels into one axial flow channel. It is assumed to be a directional unit flow path.
That is, the first axial flow path 19(1) and the second axial flow path 19(2) constitute one axial unit flow path, and the third axial flow path 19(3) and the Four axial flow paths 19(4) constitute one axial unit flow path, and likewise, a set of two axial flow paths are formed in order along the circumferential direction.

The circumferential connector 16 on the one end side is arranged on the one end side of the stator 10 . Each of the plurality of one-end-side circumferential connecting portions 16a constituting the one-end-side circumferential connecting body 16 connects one ends of the two axial flow paths 19 in the respective axial unit flow paths to each other, thereby A circumferential channel is formed between one end of the two axial channels 19 in the channel and through which the coolant flows.

That is, the first one end side circumferential connecting portion 16a(1) connects one end of the first axial flow path 19(1) and one end of the second axial flow path 19(2), communicate.
The second one-end circumferential connecting portion 16a(2) connects one end of the third axial flow path 19(3) and one end of the fourth axial flow path 19(4) to communicate with each other. .
Similarly, two axial flow paths 19 are connected to the circumferential connecting portion 16a at one end side for each axial unit flow path to communicate with each other.

The one end side circumferential connector 16 is an assembly of a plurality of one end side circumferential connection portions 16a.
The one-end-side circumferential connector 16 has a structure in which the one-end-side circumferential connector 16a is arranged every other teeth 11a.
As shown in FIGS. 10 and 11, the circumferential connector 16 on the one end side surrounds the portion of the coil 12 wound around each tooth 11a that protrudes from the one end side of the tooth 11a. Circumferential direction connection part 16a on one end side is made of resin with spaces communicating with slots 11b located on both sides of 11a.

One end of the circumferential connector 16 on the one end side communicates with one end of the 0th axial flow path 19(0), and the other end connects to the supply hole 51 of the stator holding frame 50 as shown in FIG. One end communicates with one end of the n-1th axial flow path 19 (n-1), and the other end communicates with the discharge hole 52 of the stator holding frame 50 as shown in FIG. A discharge hole 16c communicating with is formed.
be done.
The supply holes 51 and the discharge holes 52 are arranged in parallel.

FIG. 10 is a view of the circumferential connector 16 on the one end side as seen from the one end face side of the stator core 11. The back face in the figure is a flat face, and as shown in FIG. Can be attached in contact with the mounting surface.
Also, in FIG. 10, the recessed portion indicates a circumferential connecting portion 16a formed of a space, and the projecting portion is in close contact with the portion of the coil 12 protruding from one end of the tooth 11a, thereby preventing the refrigerant from flowing in the circumferential direction. is preventing The peripheral walls on both sides are in close contact with the projecting portion of the coil 12 and are continuous with the outer side resin portion 18a and the inner side resin portion 18b.

In FIG. 2, the supply hole 51 and the discharge hole 52 are virtually shown, and in FIG. showing.

Circumferential connection portions 16a on the one end side are formed by a space forming the circumferential connection portion 16a on the one end side where the refrigerant is formed on the outer peripheral surface of the portion of the coil 12 wound around the teeth 11a that protrudes from the one end side of the teeth 11a. Because of the direct contact structure, the coolant flowing through the circumferential connecting portion 16a on the one end side efficiently absorbs heat from the outer peripheral surface of the projecting portion of the coil 12. As shown in FIG.

The circumferential connector 17 on the other end side is arranged on the other end side of the stator 10 . Each of the plurality of other-end-side circumferential connecting portions 17a constituting the other-end-side circumferential connecting body 17 is connected to the axial flow path of one of the adjacent two axial unit flow paths. The other end of the channel 19 is connected to the other end of the axial unit channel 19 of the other axial unit channel adjacent to the axial channel 19, and the other end of the two adjacent axial channels 19 to form a circumferential flow path through which the coolant flows.

That is, the first other-end-side circumferential connecting portion 17a(1) is connected to the other end of the second axial flow path 19(2) and the other end of the third axial flow path 19(3). and communicate with each other.
The second other end side circumferential connecting portion 17a(2) is connected to the other end of the fourth axial flow path 19(4) and the other end of the fifth axial flow path 19(5), communicate with each other.
Similarly, each adjacent axial flow path 19 of the sequentially adjacent axial unit flow paths is connected to the circumferential connecting portion 17a at the other end thereof for communication.

The circumferential connecting body 17 on the other end side is an assembly of a plurality of circumferential connecting portions 17a on the other end side.
Circumferential connecting bodies 17 on the other end side have circumferential connecting portions 17a on the other end side for every other teeth 11a in addition to the teeth 11a on which the circumferential connecting portions 16a on the one end side are disposed. Arranged configuration.
That is, the one-end-side circumferential connection portion 16a constituting the one-end-side circumferential connection body 16 and the other-end-side circumferential connection portion 17a constituting the other-end-side circumferential connection body 17 are composed of a plurality of teeth. 11a are staggered.

The structure of the circumferential connector 17 on the other end side is the same as the structure of the circumferential connector 16 on the one end side shown in FIGS. Circumferential direction connection part 17a on the other end side is constituted by a space that surrounds the part of the coil 12 protruding from the other end side of the teeth 11a and communicates with the slots 11b located on both sides of the teeth 11a.

Circumferential connection portions 17a on the other end side are formed by refrigerant on the outer peripheral surfaces of portions of the coils 12 wound around the teeth 11a that protrude from the other end sides of the teeth 11a. Since the coil 12 is in direct contact with the space, the refrigerant flowing to the circumferential connecting portion 17a on the other end side efficiently absorbs heat from the outer peripheral surface of the protruding portion of the coil 12. As shown in FIG.

The 0th other end side circumferential connecting portion 17a(0) is connected to the other end of the 0th axial flow path 19(0) and the other end of the first axial flow path 19(1), communicate with each other.
The other end side of the n/2-th circumferential connecting portion 17a (n/2) is connected to the other end of the n-2th axial flow path 19 (n-2) and the n-1th axial flow path 19. (n-2) to communicate with each other.

As a result, as shown in FIG. 12, from the supply hole 16b, the 0th axial flow path 19(0)--the other end side of the 0th circumferential connecting portion 17a(0)--the first axial flow path 19 (1)—First one end side circumferential connecting portion 16a(1)—Second axial flow path 19(2)—First other end side circumferential connecting portion 17a(1)—Third Axial flow path 19(3)-Second one end circumferential connecting portion 16a(2)-...- n-3th axial flow path 19(n-3)-n/2th end side circumferential connection portion 16a (n/2)-n-2th axial flow path 19 (n-2)-n/2th other end side circumferential connection portion 17a (n/2)-th A cooling mechanism is configured as a series of flow passages leading to the discharge hole 16c via the n-1 axial flow passages 19(n-1).

In short, the circumferential connector 16 on one end and the circumferential connector 17 on the other end correspond to all of the axial flow paths 19, and the circumferential connector 16 on the one end corresponds to one axial direction of the adjacent slots 11b. It has a supply hole 16b that communicates with the flow path 19 and a discharge hole 16c that communicates with the other axial flow path 19. A circumferential connector 16 on one end side and a circumferential connector 17 on the other end side connect one A series of cooling mechanisms is formed that communicates all the axial passages 19 from the supply hole 16b with which the axial passage 19 communicates to the discharge hole 16c with which the other axial passage 19 communicates.

The circumferential connector 16 on one end and the circumferential connector 17 on the other end are molded with epoxy resin together with the outer resin portion 18a and the inner resin portion 18b. The resin portion located on the other end side of the stator core 11 becomes the circumferential connector 17 on the other end side.

In this way, the circumferential connector 16 on one end side, the circumferential connector 17 on the other end side, the outer resin portion 18a, and the inner resin portion 18b are integrally formed by resin molding. There is no possibility that the refrigerant will leak from the cooling mechanism that serves as a flow path for the cooling medium.
That is, the molded resin, the outer side wedge 14 and the inner side wedge 15 function as sealing members for the coolant.

In the rotating electric machine 1 configured as described above, the cooling mechanism for cooling the stator 10 is configured such that the coolant flows from the supply hole 16b to all of the axial flow paths 19, the circumferential connection portion 16a on one end side, and the circumferential connection portion 16a on the other end side. It flows serially through the portion 17a and reaches the discharge hole 16c.

In the stator 10 of the rotary electric machine 1, the coil 12 generates heat due to Joule heat generation due to current application and eddy current loss caused by the flow of eddy current, and the stator core 11 generates hysteresis loss and eddy current loss caused by the change in the direction of the magnetic field. Heat is generated by current loss. In addition, there is a risk that the enamel coating for insulation in the coil 12 will melt beyond the allowable heat resistance temperature, causing a short circuit due to partial discharge.
The rotary electric machine 1 according to Embodiment 1 has improved cooling performance against heat generated by the coil 12 and heat generated by the stator core 11, and the enamel coating of the coil 12 does not exceed the allowable heat resistance temperature, thereby protecting the enamel coating from overheating. can.

That is, in the rotating electrical machine 1 according to Embodiment 1, the inside of the slots 11b of the stator 10 in which the coils 12 are accommodated in the slots 11b is used as the axial flow path 19, and the stator 10 is arranged on one end side of the stator 10, and the plurality of shafts are provided. A plurality of circumferential connecting portions 16 a on one end side forming circumferential flow passages in which the coolant flows between one ends of the two axial flow passages 19 of the directional flow passages 19 are provided and arranged on the other end side of the stator 10 . , a plurality of circumferential connecting portions 17a on the other end side forming circumferential flow passages in which the coolant flows between the other ends of two of the plurality of axial flow passages 19 and the other ends of the plurality of axial flow passages 19; A coolant flow path is formed by the directional flow path 19, the plurality of circumferential connection portions 16a on one end side, and the plurality of circumferential connection portions 17a on the other end side. Improves cooling performance.

Further, in the rotary electric machine 1 according to Embodiment 1, the axial flow paths 19 for all the slots 11b of the stator 10 are formed by the plurality of circumferential connection portions 16a on the one end side and the plurality of circumferential connection portions 17a on the other end side. Since it is configured as a series of coolant flow paths, the amount of coolant flowing through all the axial flow paths 19 is the same, and the temperature does not locally rise in all the axial flow paths 19; , a high flow velocity can be obtained without decreasing the flow velocity of the coolant flowing through the series of coolant passages, the heat transfer coefficient between the coolant and the stator core 11 and the coil 12 is improved, and the stator core 11 and the coil 12 are highly cooled. Efficiency is obtained.

Further, in the rotary electric machine 1 according to Embodiment 1, the one-end-side circumferential connector 16 is made of resin as an assembly of a plurality of one-end-side circumferential connectors 16a, and each of the one-end-side circumferential connectors 16a communicates with one end of two adjacent axial flow passages 19, and is constituted by a space surrounding a portion of the coil positioned between the two axial flow passages 19 protruding from one end side of the stator core 11; The other-end-side circumferential connection body 17 is made of resin as an aggregate of the end-side circumferential-direction connection portions 17a. Since the space surrounds the portion of the coil 12 that communicates with the end and is positioned between the two axial flow paths 19 and protrudes from the other end side of the stator core 11 , the refrigerant and the coil 12 in the axial flow path 19 In addition to the surface area of contact, the surface area of contact between the coil 12 and the refrigerant at the circumferential connection portion 16a on the one end side and the surface area of contact between the coil 12 and the refrigerant on the circumferential connection portion 17a on the other end side are increased. The surface area for directly cooling the coil 12 is increased, and the coil 12 can be cooled with high efficiency.

Embodiment 2.
A rotating electric machine according to Embodiment 2 will be described with reference to FIG. 13 .
In the rotary electric machine 1 according to Embodiment 1, the supply hole 16b is formed on one side and the discharge hole 16c is formed on the other side of the adjacent axial flow path 19 in the circumferential connector 16 on the one end side. However, the rotary electric machine according to the second embodiment is different only in that the supply hole 16b and the discharge hole 16c are formed at symmetrical positions of 180 degrees. Same as 1.

That is, the circumferential connector 16 on one end has two adjacent axial flow paths 19, that is, the 0th axial flow path 19(0) and the n-1th axial flow path 19(n-1 ) and formed by a space surrounding a portion of the coil located between the two axial flow paths 19(0) and 19(n−1) protruding from one end side of the stator core 11. A portion 16a(0) is provided, and a supply hole 16b communicating with the supply hole 51 of the stator holding frame 50 is formed in the circumferential connection portion 16a(0).

On the other hand, the discharge hole 52 of the stator holding frame 50 communicates with the circumferential connection portion 16a(n/4) located 180 degrees apart from the circumferential connection portion 16a(0) in which the supply hole 16b is formed. A discharge hole 16c is formed.

In the rotating electric machine configured as described above, the cooling mechanism for cooling the stator 10 is divided from the supply hole 16b at the circumferential connection portion 16a(0) and is distributed from the 0th axial flow path 19(0) in the circumferential direction. A cooling mechanism that serves as a coolant flow path to the discharge hole 16c at the connection portion 16a (n/4), and a It has two cooling mechanisms, one cooling mechanism serving as a coolant flow path to the discharge hole 16c.

That is, the coolant supplied from the supply hole 16b is split into two at the circumferential connection portion 16a(0), one being the coolant channel from the 0th axial channel 19(0) and the other being the 2nd channel. The coolant flows through the coolant channel from the n−1 axial channel 19(n−1), joins at the circumferential connecting portion 16a(n/4), and is discharged from the discharge hole 16c.

In short, the one-end-side circumferential connector 16 and the other-end-side circumferential connector 17 correspond to all of the axial flow paths 19, and the one-end-side circumferential connector 16 corresponds to one one-end-side circumferential connector. 16a, and a discharge hole 16c that communicates with the circumferential connection portion 16a on the one end side provided at a position 180 degrees symmetrical with the circumferential connection portion 16a on the one end side. Circumferential connection on one end provided at positions symmetrical by 180 degrees from the supply hole 16b through which the circumferential connection 16a on one end communicates with the circumferential connection 16 and the circumferential connection 17 on the other end. Two series of cooling mechanisms are formed with two coolant channels for all axial channels 19 up to the discharge hole 16c communicating with the portion 16a.

Also in the rotating electric machine according to the second embodiment, no local temperature rise is caused in all of the axial flow paths 19, and non-uniformity in temperature distribution in each of the coolant flow paths in the two cooling mechanisms is suppressed. Thus, the cooling performance for the stator core 11 and the coils 12 constituting the stator 10 is improved as in the rotating electric machine 1 according to the first embodiment.

In addition, since the rotary electric machine according to Embodiment 2 is configured to have two refrigerant flow paths as a cooling mechanism, the pressure loss generated in the refrigerant flow paths is reduced, so the load for supplying the refrigerant is reduced. .

Embodiment 3.
A rotating electrical machine according to Embodiment 3 will be described with reference to FIG. 14 .
While the rotary electric machine 1 according to the first embodiment uses a series of cooling mechanisms for all the axial flow paths 19, the rotary electric machine according to the third embodiment divides the axial flow paths 19 into two groups. The only difference is that a series of cooling mechanisms are configured for each of the two groups, and other points are the same as the rotary electric machine 1 according to the first embodiment.

That is, the circumferential connector 16 on one end has two adjacent axial flow paths 19, that is, the 0th axial flow path 19(0) and the n-1th axial flow path 19(n-1 ) are formed, and the two adjacent axial flow paths 19 in which the supply holes 16b are formed are 180 degrees symmetrical to each other. Discharge holes 16c (1 ) and a discharge hole 16c(2) are formed.

A partition is formed between the supply holes 16b(1) and 16b(2) to block the flow of the coolant, and between the discharge holes 16c(1) and 16c(2) the flow of the coolant is blocked. A partition wall is formed.
In the rotating electrical machine configured as described above, the cooling mechanism for cooling the stator 10 includes the 0th axial flow path 19(0) from the supply hole 16b(1) to the n/2-1th axial flow path. A cooling mechanism serving as a coolant flow path to the discharge hole 16c(1) through the passage 19(n/2-1), and an n-1th axial flow path 19(n-1) from the supply hole 16b(2). . . , a cooling mechanism serving as a coolant flow path to the discharge hole 16c(2) via the n/2th axial flow path 19(n/2).

That is, the coolant supplied from the supply hole 16b(1) flows through the coolant channel to the discharge hole 16c(1) and is discharged from the discharge hole 16c(1), and the coolant supplied from the supply hole 16b(2) The coolant flows through the coolant channel to the discharge hole 16c(2) and is discharged from the discharge hole 16c(2).

Also in the rotating electric machine according to the third embodiment, no local temperature rise is caused in all of the axial flow paths 19, and non-uniformity in temperature distribution in each of the coolant flow paths in the two cooling mechanisms is suppressed. Thus, the cooling performance for the stator core 11 and the coils 12 constituting the stator 10 is improved as in the rotating electric machine according to the first embodiment.

In addition, since the rotary electric machine according to Embodiment 3 is configured to have two refrigerant flow paths as a cooling mechanism, the pressure loss generated in the refrigerant flow paths is reduced, so the load for supplying the refrigerant is reduced. .
Furthermore, by reversing the supply hole 16b(2) and the discharge hole 16c(2), the direction of flow of the coolant flowing in the coolant flow path can be reversed, and the direction of flow of the coolant can be reversed as the temperature rises. can be selected, and the non-uniformity of the temperature distribution can be further suppressed.

In the rotating electric machine according to Embodiment 3, the axial flow passages 19 are divided into two groups, but divided into three groups or four groups, and each group is divided into one end side circumferential direction. The connection body 16 may have a supply hole 16b and a discharge hole 16c.
At this time, a partition is formed between adjacent supply hole 16b and discharge hole 16c, supply hole 16b and supply hole 16b, or discharge hole 16c and discharge hole 16c to block the flow of the refrigerant.

In short, the cooling mechanism in the rotating electric machine according to Embodiment 3 has the axial flow paths 19 for all the slots 11b of the stator 10, divides all the axial flow paths 19 into a plurality of grooves, and divides them into a plurality of grooves. and the circumferential connector 17 on the other end correspond to all of the axial flow paths 19, and the circumferential connector 16 on the one end communicates with one axial flow path 19 for each groove. It has a supply hole 16b and a discharge hole 16c communicating with one axial flow path 19, and discharges from the supply hole 16b for each groove by a circumferential connector 16 on one end and a circumferential connector 17 on the other end. A plurality of independent series of cooling mechanisms are formed by using the axial flow passages 19 in the group as coolant flow passages that communicate with each other up to the holes 16c.

Embodiment 4.
A rotating electrical machine according to Embodiment 4 will be described with reference to FIGS. 15 and 16. FIG.
In the rotary electric machine 1 according to Embodiment 1, the radial length of the axial flow path 19 is the same as that of the axial flow path 19 between the two adjacent axial flow paths 19 at the circumferential connecting portion 16a of the circumferential connecting body 16 on the one end side. In the rotary electric machine according to the fourth embodiment, the circumferential connecting portion 16a of the circumferential connecting body 16 on the one end side has two adjacent circumferential flow paths. The width between the two axial flow passages 19 is longer than the radial length of the axial flow passages 19, and the main path A connecting the two axial flow passages 19 protrudes toward the inner peripheral side and the outer peripheral side. A circumferential flow path having a cross-sectional cross section having a portion B and a projecting portion C is formed.

That is, not only is the circumferential connecting portion 16 a of the circumferential connecting body 16 on one end side directly contacting the axial end face of the coil 12 , but the refrigerant is not only in direct contact with the axial end face of the stator core 11 . It has protrusions B and C that are in direct contact.
As a result, the coolant flowing through the circumferential connection portion 16a on the one end side efficiently absorbs heat from the outer peripheral surface of the protruding portion of the coil 12 and efficiently absorbs heat from the axial end surface of the stator core 11, resulting in higher cooling. effect is obtained.

Further, between the two axial flow paths 19 where the circumferential connecting portions 17a of the circumferential connecting body 17 on the other end side are adjacent to each other, the rotating electric machine 1 according to the first embodiment has the same cross section of the circumferential path. On the other hand, in the rotary electric machine according to Embodiment 4, the circumferential flow path in the circumferential connecting portion 17a of the circumferential connecting body 17 on the other end side is the main connecting portion between the two adjacent axial flow paths 19. The cross section of the path A has protrusions B and C projecting to the inner peripheral side and the outer peripheral side with the width between the two axial flow paths 19 being longer than the radial length of the axial flow paths 19. A cross-shaped circumferential flow path is formed.

That is, not only is the circumferential connecting portion 17 a of the circumferential connecting body 17 on the other end side directly contacting the axial end face of the coil 12 , but the refrigerant is not only in direct contact with the axial end face of the stator core 11 . It has a protrusion B and a protrusion C that are configured to be in direct contact with the .
As a result, the refrigerant flowing to the circumferential connecting portion 17a on the other end side efficiently absorbs heat from the outer peripheral surface of the protruding portion of the coil 12 and efficiently absorbs heat from the axial end surface of the stator core 11, resulting in a higher temperature. Provides a cooling effect.

In the rotary electric machine according to Embodiment 4, the shape of the circumferential path of the circumferential connecting portion 16a of the circumferential connecting body 16 on the one end side and the shape of the circumferential connecting portion 17a of the circumferential connecting body 17 on the other end side are: It is the same as the rotary electric machine 1 according to the first embodiment except that it is different from the rotary electric machine 1 according to the first embodiment.

As can be seen from the cross section shown in FIGS. 15 and 16, the circumferential connecting body 16 on the one end side has two adjacent axial flow paths 19 as main circumferential paths in the circumferential connecting portion 16a on the one end side. Protrusions B and C are formed between two adjacent axial flow paths 19 which are communicated by a path A and protrude inwardly and outwardly. , constitutes a continuous space serving as a circumferential path.

The circumferential connecting body 17 on the other end side is not shown, but the circumferential path in the circumferential connecting portion 17a on the other end side is such that the two adjacent axial flow paths 19 communicate with each other through the main path A, A protrusion B and a protrusion C projecting to the inner peripheral side and the outer peripheral side are formed between the two axial flow paths 19, and the main path A, the protrusion B, and the protrusion C form a continuous circumferential path. It constitutes a space with

The rotating electric machine according to the fourth embodiment has the same effect as the rotating electric machine 1 according to the first embodiment, and also has a circumferential path in the circumferential connecting portion 16a on the one end side of the circumferential connecting body 16 on the one end side. A protrusion B and a protrusion C are formed in each of the circumferential paths in the circumferential connecting portion 17a on the other end side of the circumferential connecting body 17 on the end side, and heat is efficiently absorbed from the outer peripheral surface of the protruding portion of the coil 12. At the same time, heat is efficiently absorbed from the axial end face of the stator core 11, resulting in a higher cooling effect.

In the rotating electric machine according to Embodiment 4, the supply hole 16b and the discharge hole 16c are arranged in the adjacent axial flow paths 19 as a refrigerating mechanism. , and a discharge hole 16c at one end of the (n-1)th axial flow path 19(n-1). They may be arranged at symmetrical positions of 180 degrees, and as shown in Embodiment 3, the axial flow passages 19 are divided into two groups, and a series of cooling mechanisms are configured for each of the two groups. Anything is fine.

Embodiment 5.
A rotating electrical machine according to Embodiment 5 will be described with reference to FIG. 17 .
In the rotary electric machine 1 according to Embodiment 1, the cross section of the circumferential path is the same between the two axial flow paths 19 where the circumferential connecting portion 16a of the circumferential connecting body 16 on the one end side is adjacent to each other. In contrast, in the rotary electric machine according to Embodiment 5, the cross section of the circumferential path in the circumferential connecting portion 16a on the one end side has a radial length of a portion communicating with the axial flow path 19, that is, a width. The radial length of the circumferential connecting portion 16a on the one end side in the rotary electric machine 1 according to Embodiment 1, which is the same as the so-called width, is the radial length of the portion between the two adjacent axial flow paths 19. , the so-called width is short.

Further, between the two axial flow paths 19 where the circumferential connecting portions 17a of the circumferential connecting body 17 on the other end side are adjacent to each other, the rotating electric machine 1 according to the first embodiment has the same cross section of the circumferential path. On the other hand, in the rotary electric machine according to Embodiment 5, the cross section of the circumferential path in the circumferential connecting portion 17a on the other end side is the radial length of the portion communicating with the axial flow path 19, the so-called The width is the same as the radial length of the circumferential connecting portion 17a on the other end side in the rotary electric machine 1 according to Embodiment 1, the so-called width, and the radial direction of the portion between the two adjacent axial flow paths 19 is the same as the width. length, the so-called width, is short.

In the rotating electric machine according to Embodiment 5, the shape of the circumferential path of the circumferential connecting portion 16a of the circumferential connecting body 16 on the one end side and the shape of the circumferential connecting portion 17a of the circumferential connecting body 17 on the other end side are: It is the same as the rotary electric machine 1 according to the first embodiment except that it is different from the rotary electric machine 1 according to the first embodiment.

As can be seen from the cross section shown in FIG. It has a narrow communicating portion A with a short length in the direction.
Both ends B and C communicate with the axial flow path 19 respectively, the communicating portion A communicates between the end B and the end C, and the communicating portion A and the ends B and C form a circumferential path. It forms a continuous space.

Although the circumferential connecting body 17 on the other end side is not shown, the circumferential path in the circumferential connecting portion 17a on the other end side is the length of both ends B and C and the length in the radial direction from both ends B and C. has a narrow communicating portion A with a short length.
Both ends B and C communicate with the axial flow path 19 respectively, the communicating portion A communicates between the end B and the end C, and the communicating portion A and the ends B and C form a circumferential path. It forms a continuous space.

The rotating electric machine according to the fifth embodiment has the same effect as the rotating electric machine 1 according to the first embodiment, and also has a circumferential path in the circumferential connecting portion 16a on the one end side of the circumferential connecting body 16 on the one end side. Since each circumferential path in the circumferential connecting portion 17a on the other end side of the circumferential connecting body 17 on the end side has a narrow communication portion A, a high flow velocity can be easily obtained, and the heat transfer coefficient on the surface of the coil 12 is high. improves.

In the rotating electric machine according to Embodiment 5, the supply hole 16b and the discharge hole 16c are arranged in the adjacent axial flow paths 19 as a refrigerating mechanism. , and a discharge hole 16c at one end of the (n-1)th axial flow path 19(n-1). They may be arranged at symmetrical positions of 180 degrees, and as shown in Embodiment 3, the axial flow passages 19 are divided into two groups, and a series of cooling mechanisms are configured for each of the two groups. Anything is fine.

Embodiment 6.
A rotating electric machine 1 according to Embodiment 6 will be described with reference to FIGS. 18 to 20. FIG.
The insulating member 13 in the rotating electrical machine 1 according to the first embodiment has a tubular shape with both ends open, whereas the insulating member 13 in the rotating electrical machine 1 according to the sixth embodiment has a tubular shape with both ends open, It is the same as the rotary electric machine 1 according to the first embodiment except that both side surfaces 13a3 and 13a4 have open spaces.

That is, as shown in FIG. 18, the insulating member 13 has a winding portion 13a and flanges 13b on both outer and inner circumferential sides of both side surfaces of the winding portion 13a.
The winding portion 13a has both end face portions 13a1 and 13a2 and both end face portions 13a3 and 13a4 having an open space over substantially the entire area.

Both end surface portions 13a1 and 13a2 of the wound portion 13a of the insulating member 13 are in close contact with both end surfaces of each tooth 11a to cover both end surfaces of each tooth 11a.
As shown in FIGS. 16 and 17, both side surface portions 13a3 and 13a4 of the winding portion 13a of the insulating member 13 are in close contact with the side surface of each tooth 11a at the outer peripheral end portion and the inner peripheral end portion thereof, and the free spaces allow the teeth 11a to be separated. A coolant path communicating with the axial flow path 19 is formed between the side surface and the coil 12 .
Between the outer peripheral side surface in the slot 11b of the coil 12 and the inner surface of the outer wedge 14, and between the inner peripheral side surface in the slot 11b of the coil 12 and the inner surface of the inner wedge 15, the axial flow path 19 and the coolant are provided. A space communicating with the road is formed.

The flange 13b on the outer peripheral side of the insulating member 13 is in close contact with the notch 11c of each tooth 11a, and the flange 13b on the inner peripheral side is in close contact with the notch 11d of each tooth 11a.
The insulating member 13 is interposed between each tooth 11a and the coil 12 wound around the tooth 11a. The side surfaces of the teeth 11a and the coil 12 are insulated by the insulating coolant filled in the coolant path formed by the space.
The material of insulating member 13 is the same as the material of insulating member 13 in rotating electric machine 1 according to the first embodiment.

The rotary electric machine 1 according to the sixth embodiment has the same effect as the rotary electric machine 1 according to the first embodiment. The flowing coolant can directly cool the side surfaces of the teeth 11 a of the stator 10 , thereby suppressing the temperature rise of the stator core 11 .

The refrigerating mechanism may be one in which the supply hole 16b and the discharge hole 16c are arranged at 180-degree symmetrical positions as in the second embodiment. The channels 19 may be divided into two groups and a series of cooling mechanisms may be arranged for each of the two groups.

Embodiment 7.
Embodiment 7 is cooling system 100 for rotating electric machine 1 according to Embodiments 1 to 5, and will be described with reference to FIG.
In FIG. 21, the rotating electrical machine according to the first embodiment is shown as the rotating electrical machine 1, but the rotating electrical machine according to any one of the rotating electrical machines according to the second to fifth embodiments may be used.

The cooling system 100 includes a pump 101 , a heat exchanger 102 , a heat radiation fan 103 , a tank 104 , and a control device 105 . It is configured by a refrigerant circuit which is a refrigerant cycle in which the supply hole 51 of the rotary electric machine 1 is connected by a refrigerant pipe 106 .

The control device 105 controls the pump 101 and the heat radiation fan 103 according to the state of the heat load of the stator 10, and adjusts the flow rate, pressure and temperature of the coolant supplied to a series of cooling mechanisms of the stator 10.

The pump 101 raises the pressure of the refrigerant cooled by the heat exchanger 102 to a high pressure, discharges the high pressure refrigerant to the supply hole 51 of the rotary electric machine 1 through the refrigerant pipe 106, and supplies the high pressure cooled refrigerant. It is sent out to a series of cooling mechanisms of the stator 10 in the rotary electric machine 1 . The coolant used is an insulating coolant.
The pump 101 has a control circuit composed of an inverter or the like, and the control circuit is controlled by a control device 105. Depending on the state of the heat load of the stator 10, the flow rate of the coolant supplied to the series of cooling mechanisms of the stator 10 is controlled. and pressure are controlled.

The heat exchanger 102 receives the refrigerant whose temperature has risen due to the heat generated by the stator 10 in the rotating electric machine 1 from the discharge hole 52 of the rotating electric machine 1 through the refrigerant pipe 53, and exchanges heat with the outside air to cool the received refrigerant whose temperature has risen. do. The refrigerant cooled by heat exchanger 102 is sent to pump 101 through refrigerant pipe 106 .

The heat exchanger 102 is air-cooled by a heat radiation fan 103 , and the coolant whose temperature has increased due to the heat generated by the stator 10 in the rotary electric machine 1 exchanges heat with the outside air blown from the heat radiation fan 103 .
The heat radiation fan 103 is controlled by the control device 105 according to the state of the heat load of the stator 10 and adjusts the temperature of the refrigerant cooled by the heat exchanger 102 .
The heat exchanger 102 also functions as a reservoir that stores refrigerant when the refrigerant circulating in the refrigerant circuit leaks.

The heat exchanger 102 is not limited to air-cooling by the heat radiation fan 103, and may be a heat exchanger that cools the refrigerant whose temperature has risen due to the heat generated by the stator 10 in the rotating electric machine 1 by exchanging heat with the cooling refrigerant. A heat exchanger having both of
The tank 104 is a reservoir that stores refrigerant when the refrigerant circulating in the refrigerant circuit leaks.

Next, the operation of the rotating electric machine cooling system 100 according to the seventh embodiment will be described.
A high-pressure cooled refrigerant set to a predetermined temperature and flow rate by the pump 101 is discharged to the supply hole 51 of the rotary electric machine 1 through the refrigerant pipe 53 and delivered to a series of cooling mechanisms of the stator 10 .
The refrigerant sent out to a series of cooling mechanisms of the stator 10 cools the stator core 11 and the coil 12 that generate heat in the stator 10, and the refrigerant whose temperature rises is heat-exchanged from the discharge hole 52 of the rotary electric machine 1 through the refrigerant pipe 53. It is guided to vessel 102 .

The temperature of the refrigerant whose temperature has increased and is guided to the heat exchanger 102 is lowered by the heat being radiated by the heat exchanger 102 .
The coolant whose temperature has decreased is led to the pump 101, and this operation is continuously repeated.

A cooling system 100 for a rotating electrical machine according to Embodiment 7 circulates a high-pressure cooled coolant through a series of cooling mechanisms for a stator 10 in a rotating electrical machine 1, thereby cooling the stator 10 in the rotating electrical machine 1 and causing overheating. Stopping of operation of the rotary electric machine 1 can be suppressed.

Embodiment 8.
An eighth embodiment is a cooling system 100 for the rotating electric machine 1 according to the first to fifth embodiments, and will be described with reference to FIG. 22 .
In FIG. 22, the rotating electric machine according to the first embodiment is shown as the rotating electric machine 1, but it may be any one of the rotating electric machines according to the second to fifth embodiments.

The cooling system 100 includes an expansion valve 111, a compressor 112, a heat exchanger 113, a heat radiation fan 114, an accumulator 115, a flow switching device 116, and a control device 117. 51 and the expansion valve 111 are connected by a liquid refrigerant pipe 118, and the flow path switching device 116 and the discharge hole 52 of the rotary electric machine 1 are connected by a gas refrigerant pipe 119. A gas refrigerant pipe 119 and a liquid refrigerant pipe 118 are used as pipes. It is configured by a refrigerant circuit, which is a refrigerating cycle, up to the supply hole 51 of .

The control device 117 controls the expansion valve 111, the compressor 112, the heat radiation fan 114, the accumulator 115, and the flow path switching device 116 according to the state of the heat load of the stator 10, and supplies the heat to a series of cooling mechanisms of the stator 10. Adjust the flow rate, pressure and temperature of the refrigerant.

The expansion valve 111 expands the high-pressure, medium-temperature liquid refrigerant condensed from the heat exchanger 113 to further lower the temperature of the liquid refrigerant, and sends the low-pressure, low-temperature liquid refrigerant to the rotary electric machine 1 through the liquid refrigerant pipe 118. , and the high-pressure cooled refrigerant is delivered to a series of cooling mechanisms for the stator 10 in the rotary electric machine 1 . The coolant used is an insulating coolant.
The expansion valve 111 is, for example, an expansion valve whose opening degree is variably controlled by a control device 117 electronically.

The flow path switching device 116 evaporates due to the heat generated by the stator 10 in the rotating electrical machine 1, and the low-pressure, high-temperature gaseous refrigerant whose temperature rises is discharged from the discharge hole 52 of the rotating electrical machine 1 through the gas refrigerant pipe 119 and through the accumulator 115. lead to compressor 112;
The accumulator 115 stores the surplus gaseous refrigerant led from the channel switching device 116 as liquid refrigerant.

The compressor 112 sucks the low-pressure, high-temperature gaseous refrigerant from the discharge hole 52 of the rotary electric machine 1 via the accumulator 115 and the flow path switching device 116 , raises the temperature, and sends the high-pressure, high-temperature gaseous refrigerant to the heat exchanger 113 . Dispense to
Compressor 112 has a control circuit configured by an inverter or the like, and the control circuit is controlled by control device 117 . Flow and pressure are controlled.

The heat exchanger 113 heats and pressurizes the high-pressure, high-temperature gaseous refrigerant with the outside air to condense the high-pressure, high-temperature gaseous refrigerant into a high-pressure, medium-temperature liquid refrigerant.
The heat exchanger 113 is air-cooled by the heat radiation fan 114 , and the heat exchanger 113 exchanges heat between the high-pressure, high-temperature gaseous refrigerant and the outside air blown from the heat radiation fan 114 .

The high-pressure medium-temperature liquid refrigerant heat-exchanged by the heat exchanger 113 is sent to the expansion valve 111 through the liquid refrigerant pipe 118 .
Radiation fan 114 is controlled by control device 117 according to the state of the heat load of stator 10 to adjust the temperature of the refrigerant cooled by heat exchanger 113 .
The heat exchanger 113 also functions as a reservoir that stores refrigerant when the refrigerant circulating in the refrigerant circuit leaks.

The heat exchanger 113 is not limited to air-cooling by the heat radiation fan 114, but may be a heat exchanger that cools the high-pressure gas refrigerant from the compressor 112 by exchanging heat with the refrigerant for cooling. You can also use a heat exchanger you have.

Next, the operation of the rotating electric machine cooling system 100 according to the sixth embodiment will be described.
A low-pressure, low-temperature liquid refrigerant set to a predetermined temperature and flow rate is discharged from the expansion valve 111 to the supply hole 51 of the rotary electric machine 1 through the liquid refrigerant pipe 118 and delivered to a series of cooling mechanisms of the stator 10 . .

The low-pressure, low-temperature liquid refrigerant sent to a series of cooling mechanisms of the stator 10 cools the heat-generating stator core 11 and coil 12 in the stator 10, and is discharged as a low-pressure, high-temperature gaseous refrigerant from the discharge hole 32 while evaporating. , the gas refrigerant pipe 119 and the channel switching device 116 are collected in the accumulator 57 .
The heat-generating coil 12 in the stator 10 is cooled by contact with the low-pressure, low-temperature liquid coolant, and the latent heat of vaporization due to the evaporation of the liquid coolant further promotes cooling.

The low-pressure, high-temperature gaseous refrigerant recovered by the accumulator 57 is sucked by the compressor 112 , raised in temperature, and discharged to the heat exchanger 113 as a high-pressure, high-temperature gaseous refrigerant.
The high-pressure, high-temperature gaseous refrigerant sent to the heat exchanger 113 is condensed by radiating heat from the heat exchanger 102, and is led to the expansion valve 111 as a high-pressure, medium-temperature liquid refrigerant whose temperature has been lowered. The action is repeated continuously.

A cooling system 100 for a rotating electrical machine according to Embodiment 8 circulates a low-pressure, low-temperature liquid coolant through a series of cooling mechanisms for a stator 10 in a rotating electrical machine 1, thereby cooling a coil 12 of a stator 10 in a rotating electrical machine 1 at a low pressure and a low temperature. It is cooled by coming into contact with the low-temperature liquid coolant, and the latent heat of vaporization when the liquid coolant evaporates further promotes the cooling.
As a result, the stator 10 in the rotating electrical machine 1 is cooled, and the stopping of operation of the rotating electrical machine 1 due to overheating can be suppressed.

It should be noted that it is possible to freely combine each embodiment, modify any component of each embodiment, or omit any component from each embodiment.

A rotating electric machine according to the present disclosure is suitable for an aircraft drive motor.

1 rotating electric machine, 10 stator, 11 stator core, 11a tooth, 11b slot, 12 coil, 13 insulating member, 14, 15 wedge, 16 circumferential connector on one end side, 16a circumferential connector on one end side, 16b supply hole, 16c discharge hole, 17 peripheral connector on the other end side, 17a peripheral connector on the other end side, 18 resin, 19, 19 (1) to 19 (n) axial flow path, 20 inner rotor, 21 inner rotor core , 22 inner permanent magnet, 30 shaft, 40 outer rotor, 41 outer rotor core, 42 outer permanent magnet, 50 stator holding frame, 60 rotor holding frame, 100 cooling system, 101 pump, 102, 113 heat exchange vessel, 103, 114 heat dissipation fan, 111 expansion valve, 112 compressor, 115 accumulator.

Claims (15)

1. Each of the slots of the stator, each of which contains a coil, has a first axial flow path to a third axial flow path through which the coolant flows between one end and the other end of the stator. ,
   The stator
   arranged on one end side, connecting one end of the first axial flow channel and one end of the second axial flow channel, and connecting one end of the first axial flow channel and the third axial flow channel; Circumferential direction of the one end side forming a circumferential flow channel in which the coolant flows between one end of the first axial flow channel and one end of the second axial flow channel without being connected to one end of the flow channel a connection;
   arranged on the other end side, connecting the other end of the second axial flow path and the other end of the third axial flow path, and the other end of the first axial flow path and the Circumferential flow path that is not connected to the other end of the third axial flow path and allows coolant to flow between the other end of the second axial flow path and the other end of the third axial flow path and a circumferential connection portion on the other end side that forms a
   The first axial flow path, the circumferential connection portion on the one end side, the second axial flow path, the circumferential connection portion on the other end side, and the third axial flow path are connected in series. Rotating electric machine.
2. The rotating electric machine according to claim 1, wherein the first axial flow path to the third axial flow path are arranged adjacent to each other in order along the circumferential direction.
3. The stator includes a stator core in which a plurality of teeth extending from the outer circumference toward the center are arranged in a ring, coils wound around the plurality of teeth and accommodated in the slots, and the plurality of teeth and the coils. an insulating member interposed between and a wedge closing the opening of the slot between adjacent coils received in the slot;
   3. A space surrounded by adjacent coils and wedges housed in respective slots, respectively, from the first axial flow path to the third axial flow path. rotating electric machine.
4. The circumferential connecting portion on the one end side surrounds a portion of the coil that protrudes from the one end side of the teeth, and is a space that communicates with one end of the first axial flow path and one end of the second axial flow path. Consists of a resin containing
   A circumferential connecting portion on the other end side surrounds a portion of the coil that protrudes from the other end side of the tooth, and connects the other end of the second axial flow path and the other end of the third axial flow path. 4. The rotating electric machine according to claim 3, which is made of resin including spaces that communicate with each other.
5. The insulating member has a cylindrical shape with both ends opened, is in close contact with both end surfaces of the teeth, covers both end surfaces of the teeth, and has the axial flow path between the side surfaces of the teeth and the coil. 5. The rotary electric machine according to claim 3, comprising both side portions having open spaces forming communicating coolant paths.
6. each having a plurality of axial flow paths through which a coolant flows between one end and the other end of the stator inside each slot of the stator containing a coil in the slots, and the plurality of axial flow paths Two adjacent axial flow paths are defined as one axial unit flow path,
   The stator
   arranged on the one end side, each connecting one end of two axial flow paths in each of the axial unit flow paths, and one end of the two axial flow paths in the axial unit flow path; a one-end-side circumferential connector having a plurality of one-end-side circumferential connection portions that form a circumferential flow path through which a coolant flows;
   The other end of one of the axial unit channels of the two adjacent axial unit channels arranged on the other end side and the other adjacent to the axial channel a plurality of other ends connecting the other ends of the axial flow passages of the axial unit flow passages and forming circumferential flow passages in which the refrigerant flows between the other ends of the two adjacent axial flow passages and a circumferential connector on the other end that has a circumferential connector on the side.
7. having said axial flow passage for all of said stator slots;
   The circumferential connector on the one end side and the circumferential connector on the other end side correspond to all of the axial flow paths,
   the circumferential connector on the one end side has a supply hole communicating with one of the axial flow passages in the adjacent slot and a discharge hole communicating with the other axial flow passage;
   By means of the circumferential connector on the one end side and the circumferential connector on the other end side, all the parts from the supply hole with which the one axial flow path communicates to the discharge hole with which the other axial flow path communicates are provided. 7. The electric rotating machine according to claim 6, comprising a series of cooling mechanisms communicating with the axial flow path.
8. having said axial flow passage for all of said stator slots;
   The circumferential connector on the one end side and the circumferential connector on the other end side correspond to all of the axial flow paths,
   The one end side circumferential connector includes a supply hole that communicates with one of the one end side circumferential connection portions, and the one end side provided at a position 180 degrees symmetrical with the one one end side circumferential direction connection portion. has a discharge hole communicating with the circumferential connection part of
   The one end side provided at a position symmetrical by 180 degrees from the supply hole with which the one end side circumferential connection portion communicates with the one end side circumferential connection body and the other end side circumferential direction connection body. 7. The electric rotating machine according to claim 6, wherein two series of cooling mechanisms are provided in which two coolant flow paths are provided for all of said axial flow paths up to said discharge hole communicating with said circumferential connecting portion.
9. having said axial flow passages for all of said slots of said stator, and dividing said all axial flow passages into a plurality of grooves;
   The circumferential connector on the one end side and the circumferential connector on the other end side correspond to all of the axial flow paths,
   The circumferential connector on the one end side has a supply hole communicating with one axial flow path and a discharge hole communicating with one axial flow path for each groove,
   The circumferential connecting member on the one end side and the circumferential connecting member on the other end side form a coolant flow channel that communicates the axial flow channels in each groove from the supply hole to the discharge hole in each groove, thereby forming a plurality of independent coolant flow paths. 7. The rotary electric machine according to claim 6, comprising a series of cooling mechanisms.
10. The stator includes a stator core in which a plurality of teeth extending from the outer circumference toward the center are arranged in a ring, coils wound around the plurality of teeth and accommodated in the slots, and the plurality of teeth and the coils. an insulating member interposed between and a wedge closing the opening of the slot between adjacent coils received in the slot;
    The rotating electric machine according to any one of claims 5 to 9, wherein each of said axial flow paths is a space surrounded by adjacent coils and said wedges accommodated in each of said slots.
11. Each of the plurality of one-end-side circumferential connecting portions of the one-end-side circumferential connecting body defines a space that surrounds a portion of the coil that protrudes from one end side of the teeth and that communicates with the slots located on both sides of the teeth. Composed of a resin containing
    Each of the plurality of other-end-side circumferential connection portions of the other-end-side circumferential connection body surrounds a portion of the coil protruding from the other-end side of the teeth and communicates with the slots located on both sides of the teeth. 11. The electric rotating machine according to claim 10, which is made of a resin that includes a space that
12. The insulating member has a cylindrical shape with both ends opened, and is in close contact with both side surfaces of the teeth, covering both side surfaces of the teeth, and the axial flow path between the side surfaces of the teeth and the coil. 12. The electric rotating machine according to claim 10, comprising both side portions having open spaces forming communicating coolant paths.
13. an inner rotor having an outer peripheral surface facing the inner peripheral surface of the stator inside the stator;
    13. The electric rotating machine according to any one of claims 1 to 12, further comprising an outer rotor outside the stator, the inner peripheral surface of which faces the outer peripheral surface of the stator.
14. 14. For a series of cooling mechanisms in which a plurality of axial flow paths and a plurality of circumferential connecting portions are connected in the rotating electric machine according to any one of claims 1 to 13, a refrigerant in the series of cooling mechanisms A cooling system for a rotary electric machine that supplies a coolant to an axial flow path to which is supplied, discharges the coolant from an axial flow path to which the coolant is discharged in the series of cooling mechanisms, and circulates the coolant through the series of cooling mechanisms. in
    A pump that pressurizes the cooled refrigerant and sends the pressurized refrigerant to the series of cooling mechanisms, heat-exchanges the refrigerant discharged from the series of cooling mechanisms, cools the refrigerant, and circulates the cooled refrigerant to the pump. a heat exchanger that
    A cooling system for a rotating electric machine.
15. 14. For a series of cooling mechanisms in which a plurality of axial flow paths and a plurality of circumferential connecting portions are connected in the rotating electric machine according to any one of claims 1 to 13, a refrigerant in the series of cooling mechanisms A cooling system for a rotary electric machine that supplies a coolant to an axial flow path to which is supplied, discharges the coolant from an axial flow path to which the coolant is discharged in the series of cooling mechanisms, and circulates the coolant through the series of cooling mechanisms. in
    an expansion valve that expands a high-pressure, medium-temperature liquid refrigerant and sends it to the series of cooling mechanisms as a low-pressure, low-temperature liquid refrigerant; an accumulator that stores the low-pressure, high-temperature gaseous refrigerant discharged from the series of cooling mechanisms; a compressor that sucks the low-pressure, high-temperature gaseous refrigerant discharged from the series of cooling mechanisms via an accumulator, compresses the sucked low-pressure, high-temperature gaseous refrigerant, and discharges the high-pressure, high-temperature gaseous refrigerant; a heat exchanger that exchanges heat with the high-pressure, high-temperature gaseous refrigerant discharged from the compressor and circulates the high-pressure, medium-temperature liquid refrigerant to the expansion valve;
    A cooling system for a rotating electric machine.

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