JP2003324901A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor which cools its inner parts such as a coil end, a rotor iron core, a stator iron core, etc. <P>SOLUTION: This motor is provided with an oil pump 34 at its side 33. The oil pump 34 pumps up cooling oil collected at the bottom of a case 30, and jets the cooling oil from a jet nozzle 42 provided in an outlet via a passage 38. The cooling oil splashes on a coil end 17, thereby cooling the coil end 17. These outlets and jet nozzles 42 are provide in plural numbers. A part of the jetted cooling oil scatters upward, and penetrates into a gap 44 between the inner flank of the case 30 and the stator iron core by capillary phenomena, thereby reducing the heat resistance between the stator iron core 14 and the case 30. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor having internal parts that generate heat when the rotor rotates.

[0002]

2. Description of the Related Art Conventionally, electric motors have been used for various purposes. For example, in electric vehicles and hybrid vehicles, an electric motor is used as driving power for the vehicle. Further, when the vehicle is being braked, the electric motor is used to regenerate energy.

The electric motor mainly comprises a stator and a rotor. The stator is formed by stacking steel plates having stator teeth extending in the inner circumferential direction from a ring-shaped yoke to form a stator iron core, and winding a coil at the slot positions between the stator teeth. It Further, the rotor is configured by disposing a rotor core around the shaft and disposing a permanent magnet inside the rotor core.

[0004]

In the above-mentioned electric motor, a current flows through the coil when the electric motor is driven or regenerated. At this time, a part of the current flowing through the coil is consumed by the resistance of the coil itself and converted into heat. Further, a part of the magnetic flux generated by the coil is consumed by the rotor iron core and the stator iron core and becomes heat. Therefore, there is a problem that the temperature of the coil becomes high and the output of the electric motor is reduced.

As a conventional technique for solving such a problem,
There is an electric motor disclosed in JP-A-7-288949. However, in the technique described in this document, the heat generated at the coil end portion passes through the coil itself and is then transferred to the stator and then to the casing, so that the thermal resistance from the coil end portion to the casing is large. In particular, since there is a minute gap (air layer) between the stator and the casing for the convenience of assembly, the thermal resistance at this portion becomes large. Therefore, the temperature of the coil end may rise when the load is high.

Further, there is an electric motor disclosed in Japanese Patent Laid-Open No. 9-46975. However, in the technique described in this document, the heat pipe is inserted in the coil end portion, the structure is complicated, and labor is required in the production process of winding the coil around the stator. Further, it is difficult to secure insulation between the heat pipe and the coil, and there is a problem in reliability.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an electric motor that preferably cools internal parts of the electric motor such as a coil end, a rotor core, or a stator core. .

[0008]

SUMMARY OF THE INVENTION According to the present invention, a stator iron core is formed by extending a plurality of stator tooth portions in a central direction from a circumferential yoke portion, and a stator iron core is wound at a slot position between the stator tooth portions. An electric motor comprising: a stator including a mounted coil; and a rotor arranged on an inner peripheral side of a stator tooth portion, the opening being provided at a position corresponding to a coil end that is a portion protruding from the stator iron core of the coil. And a supply means for supplying a cooling liquid to the passage.

It is preferable that the passage has a plurality of openings and that the cooling liquid is supplied to a plurality of positions of the coil end.

It is preferable that the opening of the passage is provided with a member for injecting a cooling liquid.

Further, it is preferable to supply a cooling liquid between the coil end and the case and the stator iron core.

Further, it is extended above the coil end,
It is preferable to provide a gutter having a plurality of supply holes, and to supply the cooling liquid supplied to the gutter from the passage to a plurality of positions of the coil end through the supply holes.

The installation angle of the gutter is preferably 30 to 45 °.

Further, it is preferable that the coil end is provided with a member for absorbing oil.

According to the present invention, a stator iron core is formed by extending a plurality of stator tooth portions in a central direction from a circumferential yoke portion, and a coil wound around a slot position between the stator tooth portions. And a rotor comprising a cylindrical rotor core arranged on the inner peripheral side of the stator tooth portion,
An electric motor including: a passage having an opening at a position corresponding to the inner surface of the cylinder of the rotor; and a supply unit that supplies a cooling liquid to the passage.

Further, it is preferable that the rotor core has fins on the inner surface of the cylinder.

According to the present invention, a stator iron core is formed by extending a plurality of stator tooth portions from a circumferential yoke portion in a central direction, and a coil wound around a slot position between the stator tooth portions. An electric motor comprising: a stator, a case arranged on an outer peripheral side of the stator core, and a rotor arranged on an inner periphery of a stator tooth portion, the path including a passage communicating between the stator core and the case. And means for supplying a cooling liquid to the passage.

Further, it is preferable to provide a groove formed along the circumferential direction between the case and the stator iron core.

Further, it is preferable that cooling oil is introduced between the case and the stator iron core by a capillary phenomenon and supplied.

Further, it is preferable that a passage communicating between the case and the stator iron core is installed at a position lower than an uppermost portion of the stator iron core.

Further, it is preferable that after supplying a part of the cooling liquid between the case and the stator core, the remaining cooling liquid is supplied to the coil ends.

[0022]

DETAILED DESCRIPTION OF THE INVENTION An electric motor according to an embodiment of the present invention will be described below with reference to the drawings.

First Embodiment. First, the electric motor of the first embodiment will be described. FIG. 1 is a configuration diagram showing an electric motor of the first embodiment. 1A is a sectional view of the electric motor, and FIGS. 1B and 1C are sectional views taken along the line AA and the line BB in FIG. 1A, respectively.

The electric motor 10 mainly comprises a stator 12 and a rotor 22. The stator 12 is configured by mounting a coil 16 on a stator iron core 14 formed by laminating a plurality of steel plates. Each steel plate has a ring-shaped yoke portion 18
The stator 16 has a shape extending in the center direction, and the coil 16 is wound at the slot positions between the stator teeth 20 which are formed when the steel plates are laminated in conformity with each other. The coil end 17, which is a part of the coil 16, is protruded from the stator core 14 in the steel plate stacking direction.

The rotor 22 arranged on the inner peripheral side of the stator 12 is constructed by arranging a rotor core 26 having a permanent magnet 24 inside thereof around a shaft 28. Rotor iron core 2
Reference numeral 6 is a substantially cylindrical shape centered on the shaft 28, and is fixed to the shaft 28 at the center thereof. The inner diameter of the cylindrical inner surface of the rotor core 26 increases from the position where it is fixed to the shaft 28 toward the end. The permanent magnet 24 arranged inside the rotor core 26 is in the shape of a flat plate, and is arranged at a position in the vicinity of the surface of the rotor core 26 facing the stator tooth portion 20 at a predetermined interval in the rotational direction.

The rotor 22 and the stator 12 are housed inside a cylindrical case 30. The case 30 includes a cylindrical portion 31 and side surface portions 33 that cover the left and right ends of the cylindrical portion 31. The inner diameter of the case cylindrical portion 31 is slightly larger than the diameter of the stator yoke portion 18, and there is a gap 44 between the yoke portion 18 and the case 30. Further, the rotor shaft 28 is rotatably supported by bearings 32 arranged on the left side surface and the right side surface of the case 30. The right end of the shaft 28 extends outside the case 30 and transmits torque to other parts.

The electric motor 10 of this embodiment is provided with a mechanism for circulating the cooling liquid to cool the coil end 17. This mechanism will be described. In the following explanation,
The case where oil is used as the cooling liquid has been described.

An oil pump 34 is arranged at the center of the left side surface of the case 30. Further, on the left side surface of the case 30, a passage 36 penetrating from the lower inside of the left side surface to the suction port of the oil pump 34 and penetrating from the discharge port of the oil pump 34 to a position just beside the coil end 17 on the upper side of the left side surface 2 Two passages 38, 40 are provided. One passage 3
As shown by the dotted line in FIG. 1C, the reference numeral 8 is provided so as to extend obliquely upward to the left in the case 30 from the oil pump 34, and is bent at a position right next to the coil end 17 toward the coil end 17. . In addition, the other path 40 is also the same.
The case 30 is provided so as to be bent obliquely upward to the right and bent toward the coil end 17. Therefore, the positions where the outlet openings of these passages 38 and 40 are provided are right next to the coil end 17, that is, the position corresponding to the coil end 17. An injection nozzle 42 is provided at the outlet of each passage 38, 40.

A predetermined amount of cooling oil is enclosed in the case 30, and cooling oil is accumulated in the lower part of the case 30. Then, when the oil pump 34 operates, the cooling oil accumulated in the lower portion is sucked into the oil pump 34 through the passage 36 and discharged into the passages 38 and 40.
Then, the cooling oil discharged to the passages 38 and 40 is
It discharges toward the coil end 17 from the outlet openings of 8, 40 and adheres to the coil end 17. The amount of cooling oil supplied is about 1 L / min.

In this embodiment, as described above, since the cooling oil is supplied to the coil end 17 having the highest temperature, the coil end 17 can be cooled and the temperature of the coil 16 can be lowered. Therefore, the electric resistance of the coil 16 is reduced, and a large current can be passed through the coil 16. This makes it possible to increase the maximum rotation speed of the electric motor 10 and downsize the electric motor 10 while maintaining the maximum driving force of the electric motor 10. Particularly, when a plurality of outlet openings are provided as in the present embodiment, the cooling oil is supplied to a plurality of positions of the coil end 17 to cool the coil end 17, so that the cooling efficiency is improved. Further, since the cooling oil is sprayed by the spray nozzle 42 in a plurality of directions, a wide area of the coil end 17 can be cooled. Further, in this embodiment, the passage 3
8 and 40 are separated from the stator core 14 of the case 30, that is, the side surface portion 3 is located farther than the stator core of the case 30.
Since the cooling oil is disposed only in the three directions, the cooling oil can be applied to the coil end 17 while keeping the temperature low. Thereby, there is an effect that the coil 16 can be cooled more efficiently.

Further, in this embodiment, the injection nozzle 42
Has a structure in which cooling oil is ejected toward the gap 44 between the stator yoke portion 18 and the case 30. The gap 44 is a gap of about 100 μm, and the cooling oil supplied to the left end in the axial direction of the gap 44 enters inside the gap 44 by a capillary phenomenon and fills all the gaps around the stator yoke portion 18. Therefore, the thermal resistance between the stator yoke portion 18 and the case 30 is reduced, and the heat of the stator 12 can be easily transferred to the case 30, and the stator 12 can be further cooled. If the flow rate of the cooling oil flowing in the gap 44 between the stator yoke portion 18 and the case 30 is set to about 50 cc / min, the cooling oil is retained in the entire area between the yoke portion 18 and the case 30.

Further, in order to supply the cooling oil to a plurality of positions of the coil end 17, the structure shown in FIG. 2 may be adopted. That is, the ring-shaped member 48 shown in FIG. 2A is fixed to the left side surface 33 of the case. This member 48 has a plurality of openings 50 at predetermined intervals, and one surface of the member 48 is provided with a groove 52 over the entire circumference. By closely fixing the surface of the member 48 in which the groove 52 is provided to the side surface 33 of the case, the cooling oil that has reached the outlet opening through the passage 46 passes through the groove 52 of the member 48 and reaches each opening 5.
0, and discharge from each opening 50 toward the coil end 17. Even in the configuration using the ring-shaped member 48 as described above, since the cooling oil is supplied from the plurality of openings 50, there is an effect that the cooling oil can be supplied to the plurality of positions of the coil end 17 to enhance the cooling efficiency. Further, since the ring-shaped member 48 having a plurality of ejection holes is constructed as one component, the assembling property is good and the cost reduction is achieved.

Second embodiment. Next, the electric motor of the second embodiment will be described. FIG. 3 is a configuration diagram showing the electric motor of the second embodiment.

The configuration of the electric motor 60 of the second embodiment is almost the same as that of the first embodiment, as shown in FIG. 3 (a). The difference is that the cooling oil passage 54 penetrates from the left side surface of the case 30 to the upper side, and the outlet opening 5 is provided above the coil end 17.
6, 58 is provided. Also in the present embodiment, the outlet openings 56 and 58 of the passage 54 are formed in the coil end 17.
At a position corresponding to the upper coil end 17, the cooling oil is discharged toward the coil end 17. Also in this embodiment, there is an effect that the coil end 17 can be cooled and the temperature of the coil 16 can be lowered.

The positions where the outlet openings 56 and 58 are provided are not limited to the uppermost part of the case 30, but may be other positions as long as they are above the coil end 17. It is also possible to provide a large number of outlet openings and supply cooling oil to a plurality of positions of the coil end 17.

As a modification of the second embodiment, the electric motor may have a structure as shown in FIG. 3 (b). In the electric motor 64 of this modification, the oil pump 66 is the electric motor 6
The cooling oil, which is provided as a component different from that of No. 4, and collected in the lower part of the case 30, is pumped up to the catch tank 68 provided in the upper part on the right side of the case 30. The cooling oil overflowing from the catch tank 68 passes through the passage 54 and the outlet opening 5
It is supplied to the coil end 17 from 6, 58 and cools the coil end 17.

Further, FIG. 4 is a configuration diagram of an application example of the electric motor according to the second embodiment, which preferably supplies the cooling oil. In this electric motor 70, a gutter 72 is provided above the coil end 17. The gutter 72 is in the shape of a flat plate and extends on the concentric circle of the coil end 17. The gutter is integrally formed with the left side surface of the case 30, and one end of the gutter 72 in the band width direction is fixed to the left side surface 33 of the case. Further, a flange 74 is attached to the other end of the trough 72 on the stator core 14 side to prevent the cooling oil from flowing out from the trough 72 in the axial direction. A plurality of holes 76 are provided in the gutter 72.
These holes 76 are located above the coil end 17,
Therefore, the cooling oil supplied from the upper cooling oil passage 54 to the gutter 72 flows down from each hole 76 to a plurality of positions of the coil end 17 and cools the coil end 17. If the angle θ shown in the figure, that is, the installation angle formed by the straight line connecting the shaft center and the extension direction end portion 78 of the gutter 72 with the vertical line is about 30 to 45 °, the cooling oil flowing from the extension direction end portion 78 is Since it reaches the end of the coil end 17, it is possible to supply the cooling oil to the coil end 17 evenly and without wasting the cooling oil. When the angle θ is smaller than 30 °, the flow velocity of the cooling oil flowing through the gutter 72 becomes slow and the coil end 17 does not reach the end. Further, when the angle θ is larger than 45 °, the flow velocity of the cooling oil is too fast, and the cooling oil does not reach the coil end 17 and falls to the lower portion of the case 30.

Next, an application example shown in FIG. 4B will be described. In this application example, a member 80 that absorbs liquid such as sponge or polyurethane is attached around the coil end 17. The cooling oil supplied from the upper passage opening 84 spreads throughout the liquid absorbing member 80 due to the water absorption of the liquid absorbing member 80, so that the entire periphery of the coil end 17 can be cooled.

Third Embodiment. Next, the electric motor of the third embodiment will be described. FIG. 5: is a block diagram which shows the electric motor of 3rd embodiment. 5A and 5B are cross-sectional views of the electric motor 90 according to the third embodiment.
(C) is a perspective view of the stator 12.

In the electric motor 90 of the third embodiment, as shown in FIG.
As shown in (c), a groove 84 having a predetermined length is provided along the outer circumference of the yoke portion at the center of the stator yoke portion 18 in the steel sheet laminating direction. A groove 86 is provided extending in the vertical direction. When the stator core 14 is assembled to the case 30, this groove serves as a passage formed between the case 30 and the stator core 14. In addition, there is a gap between the stator core 14 and the case 30 which can be assembled for convenience. And
When the cooling oil overflows from the catch tank 68, the cooling oil is first guided between the case 30 and the stator core 14 through the passage 84, and a part of the cooling oil is discharged into the gap between the stator core 14 and the case 30 there. Then, most of the remaining cooling oil is guided to the coil end 17.

In this embodiment, a part of the cooling oil is made to enter the gap between the stator core 14 and the case 30. Therefore, compared with the case where the gap is an air layer, the thermal resistance is significantly reduced, and there is an effect that heat dissipation from the stator core 14 to the case 30 can be promoted. At this time, as can be seen from the cooling principle, the cooling capacity does not depend on the oil flow rate, and only the flow rate (50c
c / min) is sufficient.

Further, since the remaining cooling oil is supplied to a plurality of positions on the coil end 17, when the cooling oil flows on the surface of the coil end 17, the temperature of the cooling oil itself rises and carries away heat. Therefore, there is an effect that the coil end 17 can be cooled. To obtain this effect, the flow rate of the cooling oil needs to be 1 L / min or more with respect to the coil end on one side.

In this embodiment, the coil end 17 is used.
Although the number of passages 86 for supplying the cooling oil to two is two, it may be provided more. The passage 86 may be formed by processing a groove in the case 30.

Even when the cooling oil is supplied to the groove between the stator core 14 and the case 30 as described above, it is preferable to provide the gutter 88 above the coil end 17 as shown in FIG. The gutter 88 allows the cooling oil to be supplied to the coil end 17 at a plurality of positions. A member that absorbs the cooling oil may be attached around the coil end 17.

Fourth Embodiment. Next, the electric motor of the fourth embodiment will be described. FIG. 7: is a block diagram which shows the electric motor of 4th Embodiment. FIG. 7A is a sectional view of the electric motor 100, and FIG. 7B is a perspective view of the rotor 22 inside the electric motor 100.

In the electric motor 100 of the fourth embodiment, as shown in FIG.
As shown in (a), the shaft 28 is provided with a hole 92 machined along the axis from the end of the shaft and a hole 94 machined in a direction orthogonal to the shaft 28. The cooling oil discharged by the oil pump 34 attached to the surface passes through the passages 92, 94 and is discharged toward the inner surface of the rotor iron core 26 in the cylinder. A spiral fin 126 is provided on the inner side surface of the rotor core 26, and the cooling oil supplied to the inner side surface of the rotor core 26 is vigorously sprayed onto the coil end 17 when the rotor rotates. Since the cooling oil is sprayed onto the entire inside of the coil end 17 by the fins 126, there is an effect that the entire area of the coil end 17 can be cooled. Further, since the surface area of the rotor core 26 is increased by providing the fins 126, the rotor core 2
The cooling performance of No. 6 is also improved.

FIG. 8 shows another embodiment in which a cooling oil passage is formed in the shaft 28. In this embodiment, the passage 102 provided along the axis and the passage 10 provided at a portion where the rotor iron core 26 and the shaft are connected in a direction orthogonal to the axis.
4 and the passage 106 provided through the rotor iron core 26 along the inner surface of the permanent magnet 24 are connected to each other,
It forms a series of passages. When the oil pump 34 supplies the cooling oil to the passages 102 to 106, the rotor iron core 26 and the permanent magnet 24 are cooled. Also, passage 1
The cooling oil flowing out from 06 is applied to the coil end 17,
The coil end 17 is cooled. Therefore, in the present embodiment, it is possible to cool the above-mentioned components inside the electric motor,
In particular, since the permanent magnet 24 is directly cooled by the cooling oil, it is possible to prevent the decrease in the magnetic force due to the heat of the permanent magnet 24.

Fifth Embodiment. Next, the electric motor of the fifth embodiment will be described. FIG. 9 is a configuration diagram showing an electric motor of the fifth embodiment.

In the electric motor 110 of this embodiment, as shown in FIG.
As shown in (a), the stator core 112 is formed by alternately stacking two types of steel plates 114 and 116 having different outer diameters. Since the outer diameters of the steel plates 114 and 116 are smaller than the inner diameter of the case 30, a gap is formed between the case 30 and the stator core 112, and the passage 120 communicates with this gap. Due to the difference in outer diameter of the laminated steel plates 114 and 116, a groove is provided in the circumferential direction on the surface of the stator iron core 112. Further, among the laminated steel plates, the outer diameter of the steel plate 118 located at the end is close to the inner diameter of the case 30.

The cooling oil supplied from the passage 120 to the gap is forced to flow in the gap along the groove from top to bottom due to the gravity received by the cooling oil itself and the pressure applied to the cooling oil by the oil pump 34. Stator iron core 112
To cool. The gap between the stator iron core 112 and the case 30 is a gap of 3 mm or more in order to reduce the pressure loss of the cooling oil, and the cooling oil pumped up by the oil pump 34 is sufficiently supplied to the cooling oil itself. The temperature rises and carries away heat. The flow rate of the circulating cooling oil is 2 L / min
The above is necessary. At this time, since the outer diameter of the steel plate 118 at the end is larger than the outer diameter of the steel plates 114 and 116 inside, the cooling oil is prevented from flowing out from the gap toward the coil end 17. The groove may be formed on the inner surface of the case 30 as shown in FIG. 9B.

Further, as shown in FIG. 10, two types of steel plates 124 and 126, a steel plate 124 having an outer diameter substantially equal to the inner diameter of the case 30 and a steel plate 126 having an outer diameter smaller than the inner diameter of the case 30.
Alternatively, the stator core 122 may be formed by alternately stacking the above to form a groove extending in the circumferential direction on the surface of the stator core 122. In this case, case 30
Grooves 12 extending axially at the top and bottom of the inner surface
By providing 8,129, the grooves on the surface of the stator core 122 communicate with the grooves 128,129 on the inner surface of the case. Then, the cooling oil supplied from the upper groove 128 flows through the gap between the stator core 122 and the case 30 to cool the stator core 122. In this case, as compared with the electric motor shown in FIG. 9A, the heat transfer area of the stator core 122 is large, and the heat can be radiated more easily.

Sixth Embodiment. Next, an electric motor according to the sixth embodiment will be described. FIG. 11: is a block diagram which shows the electric motor of 6th Embodiment.

In the electric motor of this embodiment, as shown in FIG. 11, a catch tank 69 is provided on the right side surface of the case 30, and from the catch tank 69, through a cooling oil communication hole 130 which is a passage of cooling oil, the stator. Cooling oil is supplied to the gap between the iron core 14 and the case 30. Then, the cooling oil enters the gap between the stator core 14 and the case 30 due to the decrease in the capillaries. This promotes heat dissipation from the stator core 14 to the case 30.

In the case of the present embodiment, the cooling oil is supplied to a position lower than the uppermost portion of the case 30, but the cooling oil moves upward through the gap against gravity due to the capillary phenomenon.
Therefore, the position of the cooling oil communication hole 130 is not at the top,
It can be in a low place. For example, in the case of mineral oil, when the gap between the stator core 14 and the case 30 is 100 μm,
Even at a position 80 mm lower than the uppermost portion, the cooling oil penetrates by the capillary phenomenon and reaches the uppermost portion of the gap. Cooling oil communication hole 13
By setting 0 at a low position, the degree of freedom in designing the electric motor is increased, and the size of the electric motor can be reduced. Further, since the gap between the stator iron core 14 and the case 30 is very narrow (100 μm), the flow rate of the cooling oil (50
cc / min) is very small. Therefore, the oil pump 66 only has to pump the cooling oil to the catch tank 69, and the cooling oil is forcibly forced to the cooling oil communication hole 130.
You don't have to send it to.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and combinations of the above embodiments or various modifications within an equivalent range are possible. Is.

In the above embodiment, the cooling oil cools the internal parts of the electric motor, so that the temperature of the cooling oil rises.
Therefore, when an electric motor is used as a drive source for an automobile,
When the vehicle starts to warm up, the oil temperature can be raised early to reduce gear loss and improve the fuel efficiency of the vehicle. At this time, it is more effective to stop the cooling water of the motor case.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an electric motor according to a first embodiment.

FIG. 2 is a configuration diagram showing a modified example of the first embodiment.

FIG. 3 is a configuration diagram showing an electric motor according to a second embodiment.

FIG. 4 is a configuration diagram showing a modified example of the second embodiment.

FIG. 5 is a configuration diagram showing an electric motor according to a third embodiment.

FIG. 6 is a configuration diagram showing a modified example of the third embodiment.

FIG. 7 is a configuration diagram showing an electric motor according to a fourth embodiment.

FIG. 8 is a configuration diagram showing a modified example of the fourth embodiment.

FIG. 9 is a configuration diagram showing an electric motor according to a fifth embodiment.

FIG. 10 is a configuration diagram showing a modified example of the fifth embodiment.

FIG. 11 is a configuration diagram showing an electric motor according to a sixth embodiment.

[Explanation of symbols]

10 electric motor, 12 stator, 14 stator core,
16 coils, 18 yoke parts, 20 stator tooth parts, 2
2 rotor, 24 permanent magnet, 26 rotor core, 28
Shaft, 30 case, 32 bearing, 34 oil pump, 36, 38, 40 passage, 42 injection nozzle, 44
Gap.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Naoki Hirasawa             14 Iwatani Shimohakaku-cho, Nishio-shi, Aichi Stock Association             Company Japan Auto Parts Research Institute (72) Inventor Onimaru ▲ Sada ▼ Hisa             14 Iwatani Shimohakaku-cho, Nishio-shi, Aichi Stock Association             Company Japan Auto Parts Research Institute (72) Inventor Jun Hoshi             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. (72) Inventor Yamasaku Isaku             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. F-term (reference) 5H002 AA10 AD02 AD03                 5H609 BB03 PP02 PP06 PP07 PP08                       QQ05 QQ10 RR27 RR30 RR48                       RR63 RR67

Claims (14)

[Claims] 1. A stator comprising a stator iron core formed by circumferentially extending a plurality of stator tooth portions from a circumferential yoke portion, and a coil wound around a slot position between the stator tooth portions. And a rotor disposed on the inner peripheral side of the stator tooth portion, the electric motor comprising: a passage having an opening at a position corresponding to a coil end that is a portion protruding from the stator core of the coil; An electric motor comprising: a supply unit that supplies a cooling liquid. 2. The electric motor according to claim 1, wherein the passage has a plurality of openings, and the cooling liquid is supplied to a plurality of positions of the coil end. 3. The electric motor according to claim 1, wherein a member for injecting a cooling liquid is provided at the opening of the passage. 4. The electric motor according to claim 3, wherein a cooling liquid is supplied between the coil end and the case and the stator core. 5. The electric motor according to claim 1, further comprising: a gutter extending above the coil end and having a plurality of supply holes, the gutter being supplied from the passage to the gutter. An electric motor, wherein cooling liquid is supplied to a plurality of positions of a coil end through the supply hole. 6. The electric motor according to claim 5, wherein the installation angle of the gutter is 30 to 45 °. 7. The electric motor according to claim 1, wherein the coil end is provided with a member that absorbs oil. 8. A stator comprising a stator iron core formed by extending a plurality of stator tooth portions in a central direction from a circumferential yoke portion, and a coil wound in a slot position between the stator tooth portions. And a rotor including a cylindrical rotor iron core arranged on the inner peripheral side of the stator tooth portion, the electric motor comprising: a passage having an opening at a position corresponding to an inner cylindrical surface of the rotor; An electric motor comprising: a supply unit that supplies a cooling liquid to the passage. 9. The electric motor according to claim 8, wherein the rotor core has fins on the inner surface of the cylinder. 10. A stator core formed by extending a plurality of stator tooth portions in a central direction from a circumferential yoke portion,
An electric motor comprising: a stator including a coil wound in a slot position between the stator tooth portions; a case disposed on the outer peripheral side of the stator core; and a rotor disposed on the inner periphery of the stator tooth portion. An electric motor comprising: a passage communicating between the stator core and the case; and means for supplying a cooling liquid to the passage. 11. The electric motor according to claim 10, further comprising a groove formed along the circumferential direction between the case and the stator core. 12. The electric motor according to claim 10, wherein the cooling oil is caused to enter and be supplied between the case and the stator core by a capillary phenomenon. 13. The electric motor according to claim 12, wherein a passage communicating between the case and the stator core is installed at a position lower than an uppermost portion of the stator core. Electric motor. 14. The electric motor according to claim 10, wherein after supplying a part of the cooling liquid between the case and the stator core, the remaining cooling liquid is supplied to the coil. Electric motor characterized by supplying to the end.