JP2003111319A - Rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating electric machine provided with stator coils by concentrated winding, wherein a rotor can be cooled. SOLUTION: A stator core 5 is provided with a plurality of slots 10 between a plurality of teeth 11. The stator coils 14 are wound on the teeth 11 by concentrated winding and housed in the slots 10. An opening is formed between the winding area of the stator coils 14 on the side faces of the teeth 11 and the outer circumferential side of the erected parts of the cylindrical portions 19 of the side faces of the teeth 11, and coolant paths 21 are formed there which run in the direction of the axis of the stator core 5.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a rotary electric machine having a cooling mechanism.

[0002]

2. Description of the Related Art In a rotating electric machine such as a motor or a generator or a motor / generator, an object to be cooled is
The stator side has a stator coil, and the rotor side has a magnet of a permanent magnet type synchronous motor and a squirrel-cage conductor of an induction motor.

In order to efficiently cool the stator side, for example, a coolant such as cooling oil flows through the inside of a slot formed in a groove portion in which the stator coil of the stator is housed, which is a heat generating portion. Japanese Patent Application Laid-Open No. 4-3 has a stator coil and a stator that can be directly cooled.
It is proposed in Japanese Patent No. 64343.

In the rotary electric machine disclosed in Japanese Unexamined Patent Publication No. 4-364343, a mold is arranged inside the stator and inside the slot, and an engineer plastic material is injected into a space defined by the stationary core and the mold. By filling and hardening this, the slot opening is closed and a cooling passage is formed inside.

According to this, the stator coil can be directly cooled by the refrigerant, and since the liquid refrigerant does not enter the air gap between the stator and the rotor, an increase in friction when the rotor rotates can be avoided.

On the other hand, there is no one that directly cools the magnet or the cage-shaped conductor arranged in the rotor. This is because when the cooling passage is provided in the rotor to flow the refrigerant, the structure of the rotor is complicated, and the centrifugal force associated with the rotation causes the refrigerant itself to move toward the outer peripheral side of the rotor, and a sufficient flow rate cannot be secured. .

Another method of cooling the rotor is to cool the rotor indirectly by cooling it with a coolant including the teeth of the stator, particularly the tip side of the stator, which is close to the rotor with an air gap. It has been proposed and is described in, for example, Japanese Patent Application Laid-Open No. 7-322565.

This is as shown in FIG.
The tooth passage 42 is provided with the refrigerant passage 41 in the axial direction, and the stator core 45 is cooled by flowing the refrigerant. In the figure, 40 is a slot, and 44 is a stator coil. The cooling of the teeth portion 42 itself sufficiently lowers the temperature of the tips of the teeth portion 42 adjacent to the rotor, so that the heat generated by the magnet or the cage conductor of the rotor is released to the stator core 5 through the air gap, and It is possible to prevent the cage conductor from overheating.

[0009]

However, in the former conventional example described above, since the teeth portion of the stator, which is close to the rotor with an air gap, in particular, the tip side thereof, is not directly cooled by the refrigerant, it is arranged on the rotor. It was not possible to cool the installed magnet or cage conductor.

Further, in the latter conventional example, although the magnet and the cage conductor arranged in the rotor can be cooled, the winding method of the stator coil 44 is distributed winding, and concentrated winding is used as the winding method. There is a defect that cannot be applied to the adopted stator core.

That is, in the distributed winding method, since the stator coil 44 is distributed and wound in the plurality of slots 40, the coil ends of the stator coil 44 are grouped together and positioned away from the end of the stator core 45. As a result, even if the coolant passage 41 for communicating the end portions of the stator core 45 with each other is provided anywhere in the tooth portion 42, the coolant passage 41 is formed.
Can be communicated with the space at the end of the stator core 45 (see FIG. 15).

However, when the concentrated winding is adopted as the winding method of the stator coil, the axial end faces of the teeth are covered with the end coils.
Even if the coolant passage is provided in the tooth portion, it may be difficult for the coolant to flow into the coolant passage.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a rotating electric machine including a concentrated winding stator coil capable of cooling a rotor.

[0014]

According to a first aspect of the present invention, there is provided a rotation comprising a stator core having a plurality of slots between a plurality of teeth portions, the stator coil being wound around the teeth portions by concentrated winding and accommodated in the slots. The electric machine is characterized in that a refrigerant passage is provided which is opened at a tip end side of the tooth portion outside the winding range of the stator coil on the side surface of the tooth portion and extends in the axial direction of the stator core.

In the case where the insulator is arranged in the stator coil winding range on the side surface of the tooth portion in order to electrically insulate the stator coil and the stator core, the refrigerant passage is opened at a portion deviated from the insulator. To be done.

When the insulator is arranged on the entire side surface of the tooth portion, the opening of the refrigerant passage is arranged through the insulator. In this case, the opening of the insulator and the refrigerant passage provided in the tooth portion may communicate with each other,
It is not necessary to have the same sectional shape.

A second invention comprises a stator core having a plurality of slots between a plurality of teeth portions, the stator coil is wound around the teeth portions by concentrated winding and accommodated in the slots, and an inner circumference of the stator core of the slots is provided. A cooling passage is formed in the stator core by closing the opening on the side of the stator core.On the other hand, a cylindrical jacket that is continuous from the inner peripheral side of the stator core and stands up from the end surface of the stator core forms independent cooling jackets inside the case at both ends of the stator core. In the rotating electric machine, a coolant passage is provided which is opened on the outer peripheral side of a portion where the cylindrical portion on the side surface of the tooth stands upright and extends in the axial direction of the stator core.

When the insulator is arranged on the side surface of the tooth portion in order to electrically insulate the stator coil and the stator core from each other, the refrigerant passage is located off the insulator as in the first aspect of the invention. Alternatively, the opening is formed through the insulator. When the opening of the refrigerant passage is provided in the insulator, it is not necessary to have the same cross-sectional shape as that provided through the teeth portion.

When an insulator is provided, the cylindrical portion stands upright from the insulator.

The cylindrical portion can be molded by resin molding by forming a molding space on the outer side and the inner peripheral side of the cylindrical portion, respectively, and abut the side surface of the tooth portion with which the outer die contacts. An opening of the refrigerant passage is formed on the outer peripheral side including the surface.

A third invention is characterized in that, in the first or second invention, a plurality of the refrigerant passages are provided in parallel with each tooth portion.

In a fourth aspect based on the first to third aspects, the refrigerant passage extends from a portion of the tooth portion outside the winding range of the stator coil to a portion covered by the winding range of the stator coil. It is characterized by being provided.

In a fifth aspect based on the fourth aspect, the tooth portion is provided with an insulator on a side surface thereof, which is wound together with a stator coil in a stator coil winding range, and the insulator is the refrigerant passage. It is characterized in that it has a notch according to the opening.

A sixth invention comprises a stator core having a plurality of slots between a plurality of teeth portions, the stator coil is wound around the teeth portions by concentrated winding and accommodated in the slots, and an inner circumference of the stator core of the slots is provided. A cooling passage is formed in the stator core by closing the opening on the side of the stator core.On the other hand, a cylindrical jacket that is continuous from the inner peripheral side of the stator core and stands up from the end surface of the stator core forms independent cooling jackets inside the case at both ends of the stator core. In a rotating electric machine, an insulator is arranged on the entire side surface of the tooth portion and wound around a stator coil together with the tooth portion, the cylindrical portion stands up from the insulator, and the cylindrical portion rises on the outer peripheral side of the portion standing upright. It is characterized in that an opening is provided, and a refrigerant passage communicating with the opening and extending in the axial direction of the stator core is provided.

A seventh invention is characterized in that, in the first to sixth inventions, the refrigerant passage has a cross-sectional shape formed in a vertically long shape in which a radial dimension of a stator core is large.

An eighth invention is characterized in that, in the first to sixth inventions, the refrigerant passage has a cross-sectional shape formed into a substantially rhombic shape having a large radial dimension of a stator core.

A ninth invention is characterized in that, in the first to sixth inventions, the refrigerant passage is formed in a substantially triangular cross-sectional shape whose height in a radial direction of a stator core is larger than a bottom side.

[0028]

Therefore, according to the first aspect of the present invention, since the coolant passage is provided so as to extend in the axial direction of the stator core while opening at the tip end side of the tooth portion outside the winding range of the stator coil, the coolant passage is not hidden by the stator coil. Can be formed, and the refrigerant can flow in the refrigerant passage without resistance.

The stator can be cooled by the refrigerant flowing in the refrigerant passage. Further, since the refrigerant passage cools the tip end side of the teeth portion, it is possible to absorb the heat generation amount of the rotor which is close to the tip end of the teeth portion via the air gap, and indirectly lower the temperature of the rotor.

According to the second aspect of the invention, since the refrigerant passages are provided on the outer peripheral side of the portion on the side surface of the tooth portion where the cylindrical portion stands up and extend in the axial direction of the stator core, the outer and inner peripheral sides of the cylindrical portion are respectively provided with the mold. When the cylindrical space is formed by forming the molding space and filling the resin with the resin, the filling resin does not block the refrigerant passage, and the refrigerant can flow into the refrigerant passage without resistance.

The stator can be cooled by the refrigerant flowing in the refrigerant passage. Further, since the refrigerant passage cools the tip end side of the tooth portion, it is possible to promote the heat radiation of the rotor which is close to the tip end of the tooth portion via the air gap, and indirectly lower the temperature of the rotor.

According to the third invention, in addition to the effect of the first or second invention, a plurality of refrigerant passages are formed in parallel,
The flow area of the refrigerant can be increased, and the cooling performance of the rotating electric machine can be improved.

In the fourth invention, in addition to the effects of the first to third inventions, the refrigerant passage extends from a portion outside the winding range of the stator coil of the teeth portion to a portion covered by the winding range of the stator coil. Since it is provided in an enlarged manner, the flow area of the refrigerant increases, and the cooling performance of the rotating electric machine can be improved.

In addition to the effect of the fourth aspect of the invention, in addition to the effect of the fourth aspect of the invention, the insulator wound around by the stator coil in the stator coil winding range on the side surface of the teeth is cut in accordance with the opening of the refrigerant passage. Since the notch is provided, the passage area of the opening of the refrigerant passage is increased, the flow passage resistance is reduced, the refrigerant easily flows, and the cooling performance of the rotating electric machine can be further improved.

In the sixth aspect of the invention, the cylindrical portion is erected on the insulator disposed on the entire side surface of the tooth portion, and an opening is provided on the outer peripheral side of the erected portion of the cylindrical portion of the insulator to extend in the stator core axial direction. However, the radial position of the opening in the radial direction of the stator core is restricted to the outer peripheral side of the cylindrical portion, but the position of the refrigerant passage in the radial direction of the stator core is not restricted and can be arranged closer to the tip side of the tooth part.

For this reason, it is possible to more effectively cool the tip end side of the teeth portion and further increase the heat radiation from the rotors that are close to each other via the air gap.

In the seventh aspect of the invention, since the cross-sectional shape of the refrigerant passage is formed in a vertically long shape in which the radial dimension of the stator core is large, the passage area of the refrigerant passage is increased and the cooling performance of the rotating electric machine can be improved.

Further, since the refrigerant passage is formed in parallel with the flow of the magnetic flux of the teeth portion, the amount of change in the passing magnetic flux is small and the performance of the rotating electric machine is not deteriorated.

In the eighth aspect of the invention, since the cross-sectional shape of the refrigerant passage is formed in a substantially rhombic shape in which the radial dimension of the stator core is large, the passage area of the refrigerant passage is increased and the cooling performance of the rotary electric machine can be improved.

Further, since the acute-angled portion of the refrigerant passage exists in the direction in which the magnetic flux of the tooth portion flows, the magnetic flux can be made to flow smoothly and the performance of the rotating electric machine is not deteriorated.

In the ninth aspect of the invention, since the cross-sectional shape of the refrigerant passage is formed in a substantially triangular shape in which the radial height of the stator core is larger than the bottom side, the passage area of the refrigerant passage increases,
The cooling performance of the rotating electric machine can be improved.

Further, since the acute angle portion of the refrigerant passage exists in the direction in which the magnetic flux of the tooth portion flows, the magnetic flux can be made to flow smoothly, and the performance of the rotating electric machine is not deteriorated.

Further, the area of the opening to the cooling jacket of the refrigerant passage can be widened, and the cooling performance of the rotating electric machine can be improved by increasing the refrigerant flow rate.

[0044]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show the entire structure of the rotating electric machine.
The rotating electric machine includes an electric motor, a generator, an electric motor / generator, and the like. In the following, the present invention will be described by using an electric motor that is an example of the rotating electric machine.

In FIG. 1, a case 1 of the electric motor comprises a cylindrical plate 1A and side plates 1B and 1C which close the openings at both axial ends of the cylindrical plate 1A. A cylindrical rotor 2 is housed in the case 1. The rotor 2 has a rotating shaft 2A supported by bearings 3 on side plates 1B and 1C of the case 1, and is rotatable about the rotating shaft 2A. The rotor 2 is shown in FIG.
As shown in, the plurality of permanent magnets 4 are housed at equal angular intervals, and the adjacent permanent magnets 4 are arranged so that their magnetic poles are different from each other.

On the inner peripheral surface of the cylindrical plate 1A of the case 1, a cylindrical stator core 5 is arranged so as to surround the outer periphery of the rotor 2. A predetermined gap is provided between the inner peripheral surface of the stator core 5 and the outer peripheral surface of the rotor 2. The stator core 5 is provided with a plurality of slots 10 that are open to the inner peripheral side, and the teeth portion 11 is formed between the slots 10. In each tooth part 11, a plate-shaped insulator 12 is arranged on both end surfaces of the tooth part 11, and a stator coil 14 is formed with an insulating paper 13 arranged on the inner surface of the slot 10.
Is wound by concentrated winding and is accommodated inside the slot 10. The winding end of the stator coil 14 is wound around the insulator 12 and bulges at the front end and the rear end of the stator core 5.

Axial engagement grooves 15 are formed on both wall surfaces forming the slot 10 at the respective openings on the inner peripheral side of the slot 10 facing the rotor 2. The pair of engaging grooves 15 that face each other with the slot 10 in between are provided with a resin plate 1
6 is attached. As will be described later, the plate 16 is filled with a resin material on the outside so as to be flush with the inner peripheral surface of the stator core 5, and a resin layer 17 is formed.
The stator coil 14 is accommodated in the slot 10 whose opening is closed by the plate 16 and the resin layer 17,
Cooling passage 18 for communicating the front end and the rear end of the stator core 5
Is formed.

At the front and rear ends of the stator core 5, there are provided annular cylindrical portions 19 which stand upright from the end portions and are continuous with the resin layer 17 and the inner peripheral surface of the stator core 5. The end portions of the cylindrical portion 19 are fixed to the side walls 1B and 1C of the case 1 via rubber seals 20, and the cooling jackets 6A and 6B, which are annular spaces communicating with each other via the cooling passages 18, are provided in the stator core 5.
Are formed at both ends of. Cooling oil is supplied to the cooling jackets 6A and 6B through a refrigerant inlet 7A penetrating the cylindrical plate 1A of the case 1. This cooling oil flows through the cooling passage 18 (see FIG. 2) formed in the slot 10 and is guided to the cooling jacket 6B on the opposite side. This cooling oil is formed on the cooling jacket 6B to form a cylindrical plate 1A.
The oil is discharged to the outside from the oil discharge port 7B that penetrates through.

In each of the teeth portions 11 of the stator core 5, there is an axially extending refrigerant passage 21 which opens radially inward of the portion of the stator coil 14 covered by the coil end.
Is provided. The opening end of the refrigerant passage 21 has a cylindrical portion 1
It is located radially outside of 9. The refrigerant passage 2
One embodiment will be described in detail with reference to FIGS. 3 to 13 below.

(First Embodiment) FIG. 3 is an enlarged view of an end face of one tooth portion 11 of the stator core 5, showing a first embodiment of the refrigerant passage 21. The tooth portion 11 is provided with a housing portion 22 in which a midway portion is recessed from both sides so as to house the stator coil 14, and the insulating paper 13 is arranged on the wall surface of the housing portion 22 to dispose the stator coil 14 therein.
Is concentratedly wound around the tooth portion 11 including the insulator 12 arranged on the end face. The insulating paper 13 and the insulator 12 electrically insulate the stator coil 14 and the teeth 11 of the stator core 5 from each other. Engagement grooves 15 are formed on both sides of the tip end side of the teeth portion 11, and both ends of the engagement groove 15 are engaged with the engagement grooves 15 of the adjacent teeth portions 11 so that the plate 1
6 are arranged, the resin layer 17 is filled, and the plate 16 is fixed to the tooth portion 11. As described above, the resin layer 17 forms the cooling passage 18 in the slot 10 that is closed by the plate 16. On the other hand, the cylindrical portion 19 is formed so as to stand in a ring shape from the side surface of the stator core 5.
A coolant passage 21 is opened on a side surface of the tooth portion 11 exposed between the cylindrical portion 19 and the stator coil 14.

The operation of the rotating electric machine having the cooling mechanism having the above structure will be described. The coolant is supplied to the cooling jacket 6A from a coolant inlet 7A that penetrates the cylindrical plate 1A of the case 1.

The coolant in the cooling jacket 6A is sent to the other cooling jacket 6B after passing through the cooling passage 18 on the side surface of the stator coil 14 of the slot 10 and the refrigerant passage 21 penetrating the teeth portion 11 in the axial direction. . The coolant flowing through the cooling passage 18 cools the stator core 5 that forms the stator coil 14 and the slot 10. The refrigerant flowing in the refrigerant passage 21 directly cools the tip side located inside the tooth portion 11 in the radial direction. The cooling of the tip end side of the teeth portion 11 is performed by the rotor 2 facing through the air gap.
The amount of heat radiated from the surface of the tooth portion 11 to the tip of the tooth portion 11 is increased.

The refrigerant in the other cooling jacket 6B flows from the outlet 7B penetrating the cylindrical plate 1A of the case 1 to a heat exchanger (not shown). The refrigerant in the cooling jackets 6A and 6B does not leak to the rotor 2 side due to the cylindrical portion 19 and the rubber seal 20.

FIG. 4 shows the results of temperature analysis of the present invention and the conventional example. As shown in FIG. 4, in the rotary electric machine provided with the refrigerant passage 21 penetrating the teeth portion 11, the cooling passage 18 is provided.
It has been confirmed that both the temperature of the stator core 5 and the temperature of the magnet 4 mounted on the rotor 2 are reduced as compared with the conventional example having only one.

The resin cylindrical portion 19 standing upright from the end of the stator core 5 is formed by the molding method shown in FIG. 5 or FIG.

FIG. 5 shows a stator core 5 fixed to the inner surface of the cylindrical portion 1A of the case 1. Each tooth portion 11 has an insulator 12 at its end face, and an insulating paper 13 at each slot 10. In this state, the stator coil 14 is housed in the slot 10 and wound. Although not shown, a plate 16 is axially arranged in the opening of each slot 10 with both ends engaged with the engagement grooves 15.

The inner die 30 is formed in a cylindrical shape having the same diameter as the inner diameter of the stator core 5, and is inserted into the stator core 5 for installation. The length of the inner mold 30 in the axial direction is longer than the axial dimension of the stator core 5, and both ends thereof are projected from the stator core 5 by the same length, for example.

The outer die 31 has a bottomed cylindrical shape having an inner diameter larger than the outer diameter of the inner die 30 by the thickness of the cylindrical portion 19, and is brought into contact with the end surface of the stator core 5 and the end surface of the inner die 30. Place it. The bottom 31A of the outer die 31 is replaced with the inner die 3
0 end surface of the outer mold 31 while the cylindrical end surface 3 of the outer mold 31
By contacting 1B with the end surface of the stator core 5 on which the stator coil 14 is not wound, a resin filling space 19A is formed between the inner mold 30, the outer mold 31, and the stator core 5. The resin-filled space 19A is continuous with the space forming the cylindrical portion 19 standing upright from the end surface of the stator core 5, and is formed on the inner peripheral side of the stator core 5 by the inner mold 30, the side surface of the tip of the tooth portion 11, and the plate 16. A forming space 17A for forming the resin layer 17 is formed. The inner diameter of the outer mold 31 is such that the plurality of refrigerant passages 21 arranged in the stator core 5 are blocked by the cylindrical end surface of the outer mold 31 while being in contact with the end surface of the stator core 5. The filling space 19A and the refrigerant passage 21 are separated from each other by forming the filling space 19A and the refrigerant passage 21 smaller than the inner diameter of the arrangement of the refrigerant passage 21 which is a circle formed by connecting the positions on the inner peripheral side. Therefore, when the resin filling space 19A is filled with the resin, the filled resin is reliably prevented from leaking into the refrigerant passage 21 and blocking the refrigerant passage 21. For the above separation, the minimum dimension A of the inner diameter of the outer mold 31 with respect to the inner diameter of the refrigerant passage 21 may be determined in consideration of the fluidity of the resin, the pressure at the time of filling, and the like.
The outer die 31 may be positioned by a positioning jig (not shown) or by bringing its outer diameter portion into contact with the inner peripheral side end surfaces of the plurality of insulators 12 of the stator core 5 as shown. .

By filling the resin filling space 19A formed by the inner die 30, the outer die 31, and the stator core 5 arranged as described above with resin, the cylindrical portion 19 and the resin layer 17 are connected to the inner surface of the stator core 5. It is formed. Actually, in order to pull out the inner die 30 from the inner circumference of the stator core 5 and pull out the outer die 31 from the cylindrical portion 19, a slight draft is formed in the inner die 30 and the outer die 31. May be.

The molding method shown in FIG. 6 differs from the molding method shown in FIG. 5 in the method of positioning the outer die 31. Figure 5
In place of the positioning jig or the end face of the insulator 12, the outer mold 31 is positioned by the projection 31C engaging with the open end of the refrigerant passage 21 in FIG. The outer die 31 can be easily positioned with respect to the stator core 5. Protrusion 3 provided on outer mold 31
At least 3 1C is sufficient.

In the present embodiment, since the coolant passage 21 extending in the axial direction of the stator core 5 is provided so as to be opened on the tip end side of the tooth portion 11 outside the winding range of the stator coil 14, it is hidden by the stator coil 14. The refrigerant passage 21 can be formed without any flow, and the refrigerant can flow into the refrigerant passage 21 without resistance.

Moreover, the cylindrical portion 19 on the side surface of the tooth portion 11
Since the refrigerant passage 21 which is opened to the outer peripheral side of the portion where the erected portion extends and extends in the axial direction of the stator core 5 is provided, the filling space 19A is formed by the molds 30 and 31 on the outer peripheral side and the inner peripheral side of the cylindrical portion 19, respectively. Cylindrical part 19 by filling
At the time of forming, the refrigerant passage 21 is not blocked by the filling resin, and the refrigerant can flow into the refrigerant passage 21 without resistance.

Therefore, the stator core 5 can be cooled by the refrigerant flowing through the refrigerant passage 21. Further, since the refrigerant passage 21 cools the tip end side of the tooth portion 11,
It is possible to indirectly reduce the temperature of the rotor 2 by absorbing the heat generation amount of the rotor 2 that is close to the tip via the air gap.

(Second Embodiment) FIG. 7 is an enlarged view of an end face of one tooth portion 11 showing a cooling mechanism by a refrigerant passage 21 according to a second embodiment of the present invention.

In FIG. 7, a plurality of refrigerant passages 21 are arranged in the circumferential direction. By forming the plurality of refrigerant passages 21, the flow area of the refrigerant increases, so that the flow rate of the refrigerant can be increased and the tips of the teeth 11 can be further cooled. Therefore, the stator core 5 of the rotating electric machine can be further cooled, while the amount of heat absorbed from the tips of the teeth 11 can be increased to increase the indirect cooling of the rotor 2 and the cooling performance of the rotating electric machine can be further improved. Become.

In the present embodiment, since the plurality of refrigerant passages 21 are formed in parallel, the area through which the refrigerant flows can be increased and the cooling performance of the rotary electric machine can be improved.

(Third Embodiment) FIG. 8 is an enlarged view of an end surface of a stator core 5 showing a cooling mechanism by a refrigerant passage 21 according to a third embodiment of the present invention. In FIG. 8, the display of the stator coil 14 wound around the side surface of the tooth portion 11 is deleted, the winding range is shown by the dotted line, and the display of the insulator 12 is also omitted.

In FIG. 8, the refrigerant passage 21 has a passage area enlarged in the outer peripheral direction of the stator core 5 to form a stator coil 1.
4 is expanded to the wound range. The portion around which the stator coil 14 is wound is the range surrounded by the dotted line in the figure, and the insulator 12 is also arranged in the same range. The stator coil 14 and the insulator 12 partially close the openings of the coolant passage 21 to the cooling jackets 6A and 6B.

That is, the refrigerant passage 21 is connected to the stator coil 1
4, the insulator 12 is partially covered,
Only the entrance / exit portion of the refrigerant passage 21. Since the passage area of the refrigerant passage 21 is enlarged as a whole, the passage resistance can be reduced and the flow rate of the refrigerant can be increased. Therefore, the tips of the teeth 11 can be further cooled, and the stator core 5 of the rotating electric machine can be further cooled, while the amount of heat absorbed from the tips of the teeth 11 can be increased to increase the indirect cooling of the rotor 2 as well. It is possible to further improve the cooling performance.

In this embodiment, as compared with the above-described respective embodiments, the refrigerant passage 21 extends from the portion outside the winding range of the stator coil 14 of the tooth portion 11 to the winding range of the stator coil 14. Since it is provided so as to be expanded to the covered portion, the flow area of the refrigerant is increased, and the cooling performance of the rotating electric machine can be improved.

Further, since the cross-sectional shape of the refrigerant passage 21 is formed to be a vertically long shape in which the radial dimension of the stator core 5 is large, the passage area of the refrigerant passage 21 is increased and the cooling performance of the rotating electric machine can be improved.

Further, since the refrigerant passage 21 is formed in parallel with the flow of the magnetic flux of the teeth portion 11, the amount of change in the passing magnetic flux is small and the performance of the rotating electric machine is not deteriorated.

(Fourth Embodiment) FIG. 9 is an enlarged view of an end surface of a stator core 5 showing a cooling mechanism by a refrigerant passage 21 according to a fourth embodiment of the present invention. In FIG. 9, the display of the stator coil 14 wound around the side surface of the tooth portion 11 is omitted, and the winding range is shown by a dotted line.

In FIG. 9, when the inlet / outlet of the refrigerant passage 21 of FIG. 8 is partially closed by the insulator 12, the insulator 12 is also cut out from the end in the same shape as the refrigerant passage 21. The cutout 12A is provided. That is,
The notch 12A is provided in the one insulator 12 that partially covers the opening portion of the refrigerant passage 21, and the other stator coil 14 that partially covers the opening portion of the refrigerant passage 21 is not changed.

As shown in FIG. 10, the cross section of the opening of the refrigerant passage 21 does not change in the range covered by the stator coil 14, but the covering position is the thickness of the insulator 12 from the opening of the refrigerant passage 21. Since they are separated, the opening area of the refrigerant passage 21 is substantially increased. Therefore, the refrigerant can flow as shown by the arrow in the figure.

Therefore, the passage resistance of the entire refrigerant passage 21 can be reduced, the flow rate of the refrigerant can be increased, and the tips of the teeth 11 can be further cooled. Therefore, the stator core 5 of the rotating electric machine can be further cooled, while the amount of heat absorbed from the tips of the teeth 11 can be increased to increase the indirect cooling of the rotor 2 and the cooling performance of the rotating electric machine can be further improved. Become.

In this embodiment, the teeth portion 11
In the winding range of the stator coil 14 on the side surface, the stator coil 14
Since the notch 12 </ b> A is provided in the insulator 12 that is wound together with the refrigerant in accordance with the opening of the refrigerant passage 21,
The passage area of the opening of No. 1 is increased, the flow path resistance is reduced, the refrigerant easily flows, and the cooling performance of the rotating electric machine can be further improved.

(Fifth Embodiment) FIG. 11 is an enlarged view of an end surface of a stator core 5 showing a cooling mechanism by a refrigerant passage 21 according to a fifth embodiment of the present invention. FIG. 11 shows the stator coil 14 wound around the side surface of the tooth portion 11.
Delete the display of, and display the winding range by the dotted line,
Further, the display of the insulator 12 is also omitted.

In FIG. 11, the refrigerant passage 21 is formed to have a substantially rhombic cross-sectional shape in which the radial dimension of the stator core 5 is longer than the circumferential dimension of the stator core 5.

Making the refrigerant passage 21 have a substantially rhombic shape which is long in the radial direction increases the passage sectional area of the refrigerant passage 21.
The flow rate of the refrigerant can be increased, and the tips of the teeth 11 can be further cooled. Therefore, the stator core 5 of the rotary electric machine
On the other hand, the amount of heat absorbed from the tips of the teeth 11 can be increased, and the indirect cooling of the rotor 2 can also be increased, so that the cooling performance of the rotating electric machine can be further improved.

The reason why the refrigerant passage 21 has a substantially rhombic shape that is long in the radial direction is that the acute angle portions of the passage cross section are located on the outer peripheral side of the stator core 5 and the inner peripheral side of the stator core 5, and are in the direction in which the magnetic flux of the teeth portion 11 flows. The magnetic flux can be made to flow gently as shown by the arrow in the figure, and the performance of the rotating electric machine is not deteriorated.

Also in this embodiment, as shown in FIG. 9, by forming a cutout similar to the refrigerant passage 21 in the insulator 12, the passage resistance at the inlet / outlet portion of the refrigerant passage 21 can be reduced.

In this embodiment, since the cross-sectional shape of the refrigerant passage 21 is formed in a substantially rhombic shape in which the radial dimension of the stator core 5 is large, the passage area of the refrigerant passage 21 is increased and the cooling performance of the rotating electric machine is improved. Can be improved.

Further, since the acute angle portion of the refrigerant passage 21 exists in the direction in which the magnetic flux of the tooth portion 11 flows, the magnetic flux can be made to flow gently and the performance of the rotary electric machine is not deteriorated.

(Sixth Embodiment) FIG. 12 is an enlarged view of a stator core end surface showing a cooling mechanism by a refrigerant passage 21 according to a sixth embodiment of the present invention. In FIG. 12, the display of the stator coil 14 wound on the side surface of the tooth portion 11 is deleted, the winding range is shown by a dotted line, and the display of the insulator 12 is also omitted.

In FIG. 12, the refrigerant passage 21 is formed to have a substantially triangular cross-sectional shape extending from the outer peripheral side of the stator core 5 to the inner peripheral side thereof.

When the refrigerant passage 21 has a substantially triangular cross-sectional shape, the passage cross-sectional area of the refrigerant passage 21 can be increased, the flow rate of the refrigerant can be increased, and the tips of the teeth 11 can be further cooled. Therefore, the stator core 5 of the rotating electric machine can be further cooled, while the amount of heat absorbed from the tips of the teeth 11 can be increased to increase the indirect cooling of the rotor 2 and the cooling performance of the rotating electric machine can be further improved. Become.

Further, since the refrigerant passage 21 is formed in a substantially triangular shape so as to extend from the outer peripheral side to the inner peripheral side of the stator core 5, the passage cross-sectional area increases,
Since the acute angle portion of the passage cross section is on the inner peripheral side of the stator core 5 and is in the direction in which the magnetic flux of the teeth portion 11 flows, it becomes possible to flow the magnetic flux gently as shown by the arrow in the figure, and the performance of the motor is degraded. There is nothing to do.

Also in this embodiment, as shown in FIG. 9, by forming a notch similar to the refrigerant passage 21 in the insulator 12, passage resistance at the inlet / outlet portion of the refrigerant passage 21 can be reduced.

In this embodiment, since the cross-sectional shape of the refrigerant passage 21 is formed in a substantially triangular shape in which the radial height of the stator core 5 is larger than the bottom side, the passage area of the refrigerant passage 21 increases and the rotation speed increases. The cooling performance of the electric machine can be improved.

Further, since the acute angle portion of the refrigerant passage 21 exists in the direction in which the magnetic flux of the tooth portion 11 flows, the magnetic flux can be made to flow gently, and the performance of the rotating electric machine is not deteriorated.

Further, the cooling jacket 6 of the refrigerant passage 21 is provided.
The area of the openings to A and 6B can be widened, and the cooling performance of the rotary electric machine can be improved by increasing the refrigerant flow rate.

(Seventh Embodiment) FIG. 13 is a partial sectional view showing a cooling mechanism by a refrigerant passage 21 according to a seventh embodiment of the present invention.

In FIG. 13, the insulator 12 is extended to the tip end side of the tooth portion 11 in the same shape as the tooth portion 11. The hole 12B is arranged in a portion of the insulator 12 that abuts the cylindrical end surface 31B of the outer die 31. When the resin-filled space 19A formed by the outer die 31, the inner die 30, and the stator core 5 is filled with resin and hardened, the resin layer 17 is formed on the inner peripheral side of the stator core 5 as described above. ,
A cylindrical portion 19 is formed integrally with the resin layer 17 and also with the insulator 12.

The refrigerant passage 21 communicates with the cooling jackets 6A and 6B through the holes 12B of the insulator 12 at both ends thereof. Therefore, as long as the refrigerant passage 21 is in communication with the hole 12B of the insulator 12, the cooling jackets 6A, 6
Since the communication with B is compensated, there is a degree of freedom in the position where the tooth portion 11 is arranged, and the tooth portion 11 can be arranged close to the tip of the tooth portion 11. The cross-sectional shape of the refrigerant passage 21 may be any of the shapes shown in FIGS.

Therefore, the refrigerant passage 21 is formed in the hole 1 of the insulator 12.
Although the size of the inlet / outlet is restricted by 2B, the passage area of the refrigerant passage 21 can be increased, so that the passage resistance can be reduced and the flow rate of the refrigerant can be increased. Therefore, the tips of the teeth portion 11 can be further cooled, and the stator core 5 of the rotating electric machine can be further cooled, while the teeth portion 11 can be cooled.
The amount of heat absorbed from the tip can be increased to increase the indirect cooling of the rotor 2, and the cooling performance of the rotating electric machine can be further improved.

Further, the arrangement position of the refrigerant passage 21 is changed to the cylindrical portion 1.
Since it is possible to arrange the teeth portion 11 close to the tip end side without being restricted by 9, it is possible to further improve the above-described operational effects.

Moreover, since the insulator 12 is integrated with the cylindrical portion 19 and the resin layer 17, it is possible to reliably prevent the refrigerant from leaking to the rotor 2 side.

In this embodiment, the teeth portion 11
The cylindrical portion 19 is erected on the insulator 12 arranged on the entire side surface of the stator 12, and a hole 12A that is an opening is provided on the outer peripheral side of the portion of the insulator 12 where the cylindrical portion 19 is erected, and the refrigerant passage 21 extending in the axial direction of the stator core 5 is formed. Therefore, the radial position of the hole 12A in the radial direction of the stator core 5 is restricted to the outer peripheral side of the cylindrical portion 19, but the radial position of the refrigerant passage 21 in the radial direction of the stator core 5 is not restricted, and the hole 12A is positioned closer to the distal end side of the tooth part 11. can do.

Therefore, the tip end side of the teeth portion 11 can be cooled more effectively, and the heat radiation from the rotor 2 which is in proximity via the air gap can be further increased.

In the above embodiment, a permanent magnet type synchronous motor is used as an example of the rotary electric machine, but although not shown, it may be an induction motor, an SR motor, or any other type. It may be a motor.

Further, in the above embodiment, the stator core 5 having the integral structure in the circumferential direction has been described. However, although not shown, a stator core having a structure in which each tooth portion is divided in the circumferential direction may be used. .

In the above embodiment, the number of stone poles is 8.
Although the pole type is described, the present invention is also applicable to a rotating electric machine having other numbers of poles, although not shown.

In the above embodiment, the electric motor has been described, but it may be a generator (not shown).

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a rotary electric machine including a cooling mechanism according to an embodiment of the present invention.

FIG. 2 is a transverse cross-sectional view of a rotary electric machine that also includes a cooling mechanism.

FIG. 3 is a side view showing an enlarged cooling mechanism.

FIG. 4 is a comparative diagram showing the results of temperature analysis comparing the effect of the cooling mechanism with that of the conventional example.

FIG. 5 is a cross-sectional view showing a method for forming a refrigerant passage.

FIG. 6 is a cross-sectional view showing another method of forming the refrigerant passage.

FIG. 7 is an enlarged side view showing the cooling mechanism of the second embodiment.

FIG. 8 is an enlarged side view showing a cooling mechanism of a third embodiment.

FIG. 9 is an enlarged side view showing a cooling mechanism according to a fourth embodiment.

FIG. 10 is a sectional view of an opening portion of a refrigerant passage.

FIG. 11 is an enlarged side view showing the cooling mechanism of the fifth embodiment.

FIG. 12 is an enlarged side view showing a cooling mechanism of a sixth embodiment.

FIG. 13 is an enlarged sectional view showing a cooling mechanism according to a seventh embodiment.

FIG. 14 is a cross-sectional view showing a conventional cooling mechanism.

FIG. 15 is another cross-sectional view showing a conventional cooling mechanism.

[Explanation of symbols]

1 case 2 rotor 4 permanent magnet 5 Stator core 6A, 6B cooling jacket 10 slots 11 Teeth Department 12 insulator 12A notch 12B hole 14 Stator coil 16 plates 17 Resin layer 18 cooling passages 19 Cylindrical part 21 Refrigerant passage 30 Inner mold 31 Outer mold

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02K 9/19 H02K 9/19 A (72) Inventor Toshio Kikuchi 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. Incorporated (72) Inventor Takashi Tsuneyoshi 2nd Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. F-term (reference) 5H002 AA10 AB06 AD02 AD04 AE07 5H603 AA13 BB01 BB02 BB08 BB09 BB12 CA01 CA05 CB02 CB03 CC11 CC17 CD01 CD04 CD21 CE01 EE11 EE12 EE13 FA02 5H609 BB02 BB03 BB04 BB19 PP02 PP06 PP07 PP08 PP09 QQ01 QQ08 QQ13 QQ18 RR26 RR37 RR42

Claims (9)

[Claims] 1. A rotating electric machine, comprising: a stator core having a plurality of slots between a plurality of teeth portions; and a stator coil wound around the teeth portions by concentrated winding to be housed in the slots. The rotary electric machine is characterized in that a coolant passage is provided which is open to the tip end side of the tooth portion outside the winding range of the above and extends in the axial direction of the stator core. 2. A stator core having a plurality of slots between a plurality of teeth portions, the stator coil is wound around the teeth portions by concentrated winding and accommodated in the slots, and an opening portion of the slots on the inner circumference side of the stator core. While forming a cooling passage by a slot in the stator core by closing the, in the rotating electric machine forming a cooling jacket independent in the case at both ends of the stator core by the cylindrical portion that continues from the stator core inner peripheral side and stands up from the stator core end surface, A rotating electric machine, characterized in that a coolant passage is provided on an outer peripheral side of a portion where the cylindrical portion on the side surface of the tooth portion stands up and extends in the axial direction of the stator core. 3. The rotating electric machine according to claim 1, wherein a plurality of the refrigerant passages are provided in parallel with each tooth portion. 4. The refrigerant passage is provided so as to expand from a portion of the tooth portion outside the winding range of the stator coil to a portion covered by the winding range of the stator coil. The rotary electric machine according to any one of paragraphs 3. 5. The tooth portion includes an insulator on a side surface, which is wound together with a stator coil in a stator coil winding range, and the insulator has a notch aligned with an opening of the refrigerant passage. The rotary electric machine according to claim 4, wherein: 6. A stator core having a plurality of slots between a plurality of teeth portions is provided, the stator coil is wound around the teeth portions by concentrated winding and accommodated in the slots, and an opening portion of the slots on the inner circumference side of the stator core is provided. While forming a cooling passage in the stator core by closing the slot in the stator core, in the rotating electric machine that forms an independent cooling jacket in the case at both ends of the stator core by the cylindrical portion that continues from the stator core inner peripheral side and stands up from the stator core end surface, An insulator is arranged on the entire side surface of the teeth portion and wound around a stator coil together with the teeth portion, the cylindrical portion stands up from the insulator, and an opening is provided on the outer peripheral side of the portion where the cylindrical portion stands up, A rotary electric machine comprising a refrigerant passage communicating with the opening and extending in the axial direction of the stator core. 7. The rotating electric machine according to claim 1, wherein the refrigerant passage has a cross-sectional shape of a vertically long shape having a large radial dimension of a stator core. 8. The rotary electric machine according to claim 1, wherein the refrigerant passage has a cross-sectional shape formed into a substantially rhombic shape having a large radial dimension of a stator core. 9. The refrigerant passage according to claim 1, wherein a cross-sectional shape of the refrigerant passage is formed into a substantially triangular shape having a radial height of a stator core larger than a bottom side thereof. Rotating electric machine.