JP2014117034A - Stator and rotating electric machine - Google Patents

Abstract

The present invention provides a stator and a rotating electrical machine capable of improving cooling efficiency by maintaining a contact state between a refrigerant and a coil.
A stator 3 of a rotating electrical machine 1 includes a stator core 5, a coil 6 wound around the stator core 5, and a part of the coil 6 projecting from both axial ends of the stator core 5. Thus, the coil end 7 formed on the both end faces of the stator core 5 over the entire region in the circumferential direction, and provided on the inner peripheral side of the coil end 7 so as to face the coil end 7, thereby cooling the coil 6. An inner circumferential flow path forming member 8 (first flow path forming member) that forms a flow path for cooling oil W to flow along the coil end 7.
[Selection] Figure 1

Description

  Embodiments described herein relate generally to a stator and a rotating electrical machine.

  In recent years, for example, rotating electric machines as drive motors used in hybrid vehicles and electric vehicles are required to have higher torque and higher output. When the torque of the drive motor is increased and the output is increased, a large amount of current is supplied to the coil, so that the amount of heat generated by the coil increases. For this reason, when the torque of the drive motor is increased and the output is increased, it is simultaneously required to increase the cooling efficiency.

  When cooling a rotating electrical machine such as a drive motor, generally, a cooling method for cooling a casing and indirectly cooling a coil as a heating element (referred to as an indirect method for convenience), a refrigerant and a coil A method of cooling the coil by directly contacting the coil (referred to as a direct method for convenience) is known. Among them, the direct method is considered to have higher cooling efficiency than the indirect method because the coil that is a heat generation source can be directly cooled by the refrigerant. Therefore, for example, Patent Document 1 employs ATF (Automatic Transmission Fluid) as a refrigerant, causes the ATF to flow down into the coil, absorbs heat by the ATF, and discharges the ATF to the outside of the casing. What cools is disclosed.

JP2011-135698A

  In the case of the direct method described above, since the refrigerant absorbs heat by contacting the coil, the cooling efficiency depends on how the refrigerant absorbs heat, in other words, how the refrigerant contacts the coil. It becomes an important factor in raising.

  However, in the case of a configuration such as Patent Document 1, for example, the refrigerant that has flowed down to the coil moves downward due to gravity. At this time, in a general rotating electrical machine, the coil (more precisely, the coil end) is formed in an annular shape in the circumferential direction of the stator, so that the refrigerant flowing down the coil is not in the circumferential direction along the coil. , May fall straight down from the position where it flows down. And the refrigerant | coolant made into perpendicular | vertical or fell has the problem that cooling efficiency will fall as a result, with little contact with a coil end, ie, the amount of heat absorption, is discharged | emitted.

  The problem to be solved by the present invention is to provide a stator and a rotating electrical machine that can improve cooling efficiency by maintaining a contact state between a refrigerant and a coil.

  According to the rotor of the embodiment, the stator core, the coil wound around the stator core, and part of the coil project from both ends in the axial direction of the stator core. A coil end formed on the entire surface in the circumferential direction, and a flow path that is provided on the inner peripheral side of the coil end so as to face the coil end and in which a coolant for cooling the coil flows along the coil end. A first flow path forming member to be formed.

The figure which shows schematically the structure of the rotary electric machine using the stator of 1st Embodiment. Enlarged view of region II in FIG. 1 of the first embodiment The figure which shows typically the flow of ATF in the state which does not provide the inner peripheral side flow-path formation member of 1st Embodiment. The figure which shows typically the flow of ATF in the state which provided the inner peripheral side flow-path formation member and inner peripheral side flow-path formation member of 1st Embodiment. The figure which shows typically the structure of the inner peripheral side flow-path formation member of 1st Embodiment, and the flow of ATF in the state which provided the inner peripheral side flow-path formation member 2 The figure which shows typically the flow of the inner peripheral side flow-path formation member and ATF of 2nd Embodiment, 1 The figure which shows typically the flow of the inner peripheral side flow-path formation member and ATF of 2nd Embodiment, the 2 The figure which shows typically the flow of ATF in the state which does not provide the outer peripheral side flow-path formation member of 3rd Embodiment. The figure which shows typically the flow of ATF in the state which provided the outer peripheral side flow-path formation member of 3rd Embodiment, and the structure of an outer peripheral side flow-path formation member. The figure which shows the modification of the flow-path formation member of 3rd Embodiment typically. The figure which shows typically arrangement | positioning of the interphase insulation paper in the coil end of 4th Embodiment. The figure which shows typically the shape of the interphase insulating paper of 4th Embodiment The figure which shows typically the structure of the rotary electric machine of 5th Embodiment. The figure which shows typically the structure of the end surface side flow-path formation member of 6th Embodiment. The figure which shows typically the structure of the flow-path formation member of other embodiment.

Hereinafter, a plurality of embodiments will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the structural part which is common in several embodiment, and detailed description is abbreviate | omitted.
(First embodiment)
Hereinafter, the first embodiment will be described with reference to FIGS. 1 to 5.
As shown in FIG. 1, the rotating electrical machine 1 according to the present embodiment includes a stator 3 and a rotor 4 in a housing 2. FIG. 1 shows a state where the rotating electrical machine 1 is installed. In the following description, the direction along the gravity is described as being up and down in the state where the rotating electrical machine 1 is installed as shown in FIG. In the present embodiment, the rotating electric machine 1 is assumed to be a drive motor used in a vehicle such as a hybrid vehicle or an electric vehicle.

  The stator 3 includes, for example, a stator core 5 formed in a substantially cylindrical shape by laminating iron core materials obtained by punching a silicon steel plate or the like in an annular shape, a coil 6 wound around the stator core 5, Coil ends respectively formed on both end surfaces of the stator core 5 over the entire circumferential direction by partially protruding from both ends in the stacking direction of the stator core 5 (the left-right direction in FIG. 1; hereinafter referred to as the axial direction). 7. As is well known, the coil 6 is formed by winding, for example, an enamel-coated element wire or a litz wire obtained by bundling a plurality of elements, and is formed on the inner peripheral surface of the stator core 5. It is inserted into a slot (not shown). In this embodiment, as shown in FIG. 11 to be described later, three phases of a U-phase coil 6a, a V-phase coil 6b, and a W-phase coil 6c are wound around the stator core 5.

  The stator 3 is provided with inner circumferential flow path forming members 8 (corresponding to first flow path forming members) at both ends of the stator core 5 in the axial direction. The inner circumferential flow path forming member 8 has a length approximately the same as the axial length of the coil end 7 as shown in FIG. 1, and the inner circumferential surface of the coil end 7 as shown in FIG. Are formed to extend in the circumferential direction so as to face each other. Further, a discontinuous portion 9 shown in FIG. 4 to be described later is formed on the lower end side of the inner peripheral flow path forming member 8 so that a part thereof is discontinuous in the circumferential direction. The inner circumferential flow path forming member 8 is formed of a material having at least heat resistance that can withstand the heat generated in the coil end 7, corrosion resistance to the refrigerant, and permeation resistance that does not allow the refrigerant to pass through. Yes. Note that a more detailed configuration of the inner peripheral flow path forming member 8 will be described in a fourth embodiment to be described later.

  As shown in FIG. 1, the rotor 4 is provided on the inner peripheral side of the stator 3, and is provided so that the rotor core 10 is sandwiched between the rotor core 10 and both ends of the rotor core 10 in the axial direction. And an end plate 11 and a shaft 12 serving as a rotating shaft. The rotor core 10 is formed in a generally cylindrical shape by stacking, for example, iron core materials obtained by punching silicon steel plates or the like in an annular shape. The rotor core 10 has a magnet insertion hole (not shown) and a permanent magnet (not shown) inserted into the magnet insertion hole. That is, in this embodiment, the rotating electrical machine 1 is assumed to be an embedded magnet type in which a permanent magnet is embedded in the rotor core 10.

  The shaft 12 is fixed by press-fitting, fitting, or insertion into a shaft hole (not shown) formed in the central portion of the rotor core 10 in the radial direction. Both ends of the shaft 12 in the axial direction are supported by bearings 13, and the shaft 12 is integral with the rotor core 10 and is rotatable relative to the stator 3. The shaft 12 may have a shape different from that shown in FIG.

  The casing 2 of the rotating electrical machine 1 is connected to the piping member 14 at the lower part and the upper part thereof. The piping member 14 communicates with the inside of the housing 2. A pump 15 is provided in the middle of the piping member 14, and the refrigerant circulates between the inside and the outside of the housing 2 by the pump 15. That is, the piping member 14 forms a circulation path through which a refrigerant for cooling the rotating electrical machine 1 circulates. In the present embodiment, ATF (Automatic Transmission Fluid; hereinafter referred to as “cooling oil W” for convenience) is employed as the refrigerant.

  The cooling oil W is supplied into the housing 2 as indicated by an arrow Y0 from a supply port (not shown) provided at a position above the coil end 7 in the upper portion of the housing 2. The number of supply ports for supplying the cooling oil W is not limited to one. For example, a plurality of supply ports may be provided corresponding to the axial direction of the coil end 7 or a plurality of supply ports corresponding to the circumferential direction of the coil end 7. . The cooling oil W supplied into the housing 2 flows down toward the coil end 7. Then, the cooling oil W that has flowed down moves downward in the housing 2 by gravity while contacting the coil end 7, and is finally temporarily stored in the lower portion of the housing 2. The cooling oil W stored in the lower part of the housing 2 is discharged from a discharge port (not shown).

  Thus, the cooling oil W absorbs heat generated in the coil end 7 by moving downward while in contact with the coil end 7 and is discharged from the housing 2 in a state of absorbing heat. As a result, heat generated in the coil end 7 is discharged to the outside of the housing 2, and the rotating electrical machine 1 is cooled. The piping member 14 is connected to a cooling mechanism 16 composed of a heat radiating member, a heat exchange member, etc., and the discharged cooling oil W is cooled by the cooling mechanism 16 and then supplied again into the housing 2. The

Next, the operation of the above configuration will be described.
As shown in FIG. 2, when the cooling oil W flowing down to the coil end 7 contacts the state side of the coil end 7, it flows as indicated by arrows Y1, Y2 and Y3. At this time, in order to cool the coil end 7 efficiently, as shown in FIG. 3, it is desirable to flow the cooling oil W along the coil end 7 as indicated by an arrow Y4. FIG. 3 schematically shows the coil end 7 viewed from the axial direction.

  Now, when the inner periphery side flow path forming member 8 is not provided, there is a possibility that a part of the cooling oil W may be vertically dropped from the coil end 7 as indicated by an arrow Y5. If the cooling oil W is dripped or dropped in such a manner, the cooling efficiency is lowered because the cooling oil W is discharged out of the housing 2 with little contact with the coil end 7. Therefore, in the present embodiment, the inner peripheral flow path forming member 8 is provided on the inner peripheral side of the coil end 7.

  Since the inner peripheral flow path forming member 8 has permeation resistance to the cooling oil W as described above, the inner peripheral flow path forming member 8 acts as a wall against the cooling oil W that is about to fall vertically. As a result, as shown in FIG. 4, the cooling oil W does not fall or fall vertically (that is, the flow indicated by the arrow Y5 in FIG. 3 is regulated), and is applied to the coil end 7 as indicated by the arrow Y4. Along the circumferential direction. At this time, the flow of the cooling oil W flowing on the surface of the coil end 7 (flow indicated by arrows Y1 and Y3 in FIG. 2) and the flow of the cooling oil W flowing inside the coil end 7 (indicated by the arrow Y2 in FIG. 2) ), The direction of the inner circumferential side flow path forming member 8 changes to the circumferential direction. That is, the inner peripheral flow path forming member 8 forms a flow path for the cooling oil W to flow in the circumferential direction along the coil end 7. As the cooling oil W flows along the coil end 7 in this way, the contact between the cooling oil W and the coil end 7 can be maintained, and the heat generated in the coil end 7 is efficiently absorbed by the cooling oil W. can do.

  By the way, even if the inner peripheral flow path forming member 8 is provided, as shown in FIG. 5, a part of the cooling oil W is further indicated on the inner peripheral side of the inner peripheral flow path forming member 8 as indicated by an arrow Y6. May enter. In that case, if the entire inner peripheral surface of the coil end 7 is covered with the inner peripheral flow path forming member 8, the cooling oil W stays on the inner peripheral side of the inner peripheral flow path forming member 8, and cooling is performed. There is a risk of reducing efficiency.

  Therefore, in the present embodiment, in a state where the stator 3 is installed, a position below the virtual horizontal line L passing through the center O of the stator 3, more strictly speaking, of the inner circumferential side flow path forming member 8. A discontinuous portion 9 that is discontinuous in the circumferential direction is formed at a position that is the lowest end portion. Thereby, the cooling oil W that has entered the inner peripheral side of the inner peripheral flow path forming member 8 flows out to the coil end 7 side through the discontinuous portion 9 as indicated by an arrow Y7. Therefore, the cooling oil W is prevented from staying on the inner peripheral side, in other words, the circulation of the cooling oil W is prevented from stagnation. Note that the width (size of the opening) of the discontinuous portion 9 may be appropriately set according to the flow rate of the cooling oil W or the like.

According to the embodiment described above, the following effects are obtained.
In the stator 3 of the embodiment, by providing the inner peripheral flow path forming member 8, a flow path in which the cooling oil W for cooling the coil end 7 flows in the circumferential direction along the coil end 7 is formed. Therefore, the cooling oil W is in a state of more contact with the coil end 7 until it is stored in the lower part. Thereby, more heat generated in the coil end 7 can be absorbed by the cooling oil W, in other words, more heat generated in the coil end 7 can be moved to the cooling oil W. And more heat is discharged | emitted from the housing | casing 2 with the cooling oil W, and the stator 3 can be cooled efficiently. That is, the cooling efficiency of the stator 3 can be increased. In addition, increasing the cooling efficiency of the stator 3 also means increasing the cooling efficiency of the rotating electrical machine 1 including the stator 3, so that the rotating electrical machine 1 can be efficiently cooled.

  Since the inner peripheral flow path forming member 8 is longer than at least the length of the coil end 7 and is formed up to the end surface of the stator core 5 so as to cover the gap between the coil end 7 and the stator core 5, When the cooling oil W that has flowed as indicated by the arrow Y3 in FIG. 2 reaches the inner circumferential flow path forming member 8, the flow changes in the circumferential direction. Therefore, even when the cooling oil W flows as indicated by the arrow Y3, the contact between the cooling oil W and the coil end 7 can be maintained, and the cooling oil W can efficiently absorb heat. it can.

  Since the discontinuous portion 9 is provided in the inner peripheral flow path forming member 8, the cooling oil W that has flowed to the inner peripheral side of the inner peripheral flow path forming member 8 passes through the discontinuous portion 9 and is on the coil end 7 side. To leak. Thereby, it can suppress that the cooling oil W stagnates and circulation stagnates. And if circulation does not stagnate, the heat | fever discharge | emission from the housing | casing 2 will also be performed without stagnation, and it can prevent that cooling efficiency falls.

(Second Embodiment)
Hereinafter, the second embodiment will be described with reference to FIGS. 6 and 7.
In the second embodiment, a first flow path forming member having a shape different from that of the first embodiment will be described. The configuration of the rotating electrical machine itself is common to the first embodiment.

<Part 1>
As shown in FIG. 6 (a), the inner peripheral flow path forming member 8 has a plurality of discontinuous portions in addition to the discontinuous portion 9 at the lowermost end at a position below the horizontal line L. 17 is formed. For this reason, as shown in FIG. 6 (b), the cooling oil W that has entered the inner peripheral side of the inner peripheral flow path forming member 8 as shown by the arrow Y6 reaches the discontinuous portion 9 at the lowest end. In the meantime, it flows out of the discontinuous part 17 as shown by arrow Y8. And the cooling oil W which flowed out from the discontinuous part 17 on the way moves below, contacting the coil end 7. FIG. For this reason, the flow of the cooling oil W that has entered the inner peripheral side of the inner peripheral flow path forming member 8 is dispersed in the circumferential direction. And the cooling oil W and the coil end 7 contact in that state, and the coil end 7 is cooled by the multiple places of the circumferential direction. Therefore, the cooling efficiency of the stator 3 can be increased.

  At this time, the axial lengths of the discontinuous portion 9 and the discontinuous portion 17 may be the same as the axial length of the inner peripheral flow path forming member 8 (see FIG. 2). That is, the inner peripheral flow path forming member 8 may be configured by arranging a plurality of members in the circumferential direction. Alternatively, the length of the discontinuous portion 9 is the same as the axial length of the inner peripheral flow path forming member 8, and slits and grooves are formed in the inner peripheral flow path forming member 8 to form the discontinuous portion. 17 may be configured. That is, the discontinuous portion 9 and the discontinuous portion 17 can have any shape and number as long as the cooling oil W can be passed from the inner peripheral side of the inner peripheral flow path forming member 8 to the coil end 7. .

<Part 2>
As shown in FIG. 7, the two inner circumferential flow path forming members 8 are all discontinuous at portions below the horizontal line L. That is, in the case of the two inner peripheral side flow path forming members 8, a substantially semicircular arc is the discontinuous portion 9. The purpose of providing the inner peripheral flow path forming member 8 is to prevent the cooling oil W from dripping or falling from the inner peripheral side of the coil end 7. In that case, since the cooling oil W moves by gravity in the housing 2, the coil end 7 exists at the moving destination of the cooling oil W within the range below the horizontal line L. Moreover, even if the cooling oil W that has entered the inner circumference moves vertically from both ends of the inner circumference flow path forming member 8 as indicated by the arrow Y6, the coil end 7 exists at the destination. Therefore, the cooling oil W can be made to flow as shown by the arrow Y9 after contacting the coil end 7.
In the case of No. 2, the number of members can be reduced when manufacturing the inner circumferential flow path forming member 8, so that an increase in cost can be suppressed.

(Third embodiment)
Hereinafter, a third embodiment will be described with reference to FIGS.
The third embodiment is different from the first embodiment in that a second flow path forming member is provided. The configuration of the rotating electrical machine itself is common to the first embodiment.
When the inner circumferential side flow path forming member 8 (first flow path forming member) is provided as in the first embodiment, the cooling oil W is disposed in the circumferential direction on the upper side of the coil end 7 above the horizontal line L. 8, as shown in FIG. 8, on the lower side of the coil end 7 below the horizontal line L, the cooling oil W may be applied from the outer peripheral side of the coil end 7 as indicated by an arrow Y <b> 10. There is a possibility of falling.

  Therefore, in the present embodiment, as shown in FIG. 9A, an outer peripheral side flow path forming member 18 (corresponding to a second flow path forming member) is provided on the outer peripheral side of the coil end 7. The outer peripheral flow path forming member 18 is formed on the outer peripheral side of the coil end 7 so as to extend in the circumferential direction so as to face the outer peripheral surface of the coil end 7. Further, the outer peripheral side flow path forming member 18 is formed so as to cover at least a range below the horizontal line L, and is slightly longer than the axial length of the coil end 7 as shown in FIG. It is formed long. In the present embodiment, since the lower end of the coil end 7 is immersed in the cooling oil W stored in the housing 2, the lower end of the outer peripheral side flow path forming member 18 is also immersed in the cooling oil W. Therefore, the lower end of the outer peripheral side flow path forming member 18 has a continuous shape.

As a result, the cooling oil W that has flowed down to the coil end 7 is prevented from falling or dropping to the outer peripheral side of the coil end 7 due to the outer peripheral flow path forming member 18 serving as a wall. As a result, the cooling oil W flows in the circumferential direction along the coil end 7 as indicated by an arrow Y11 in FIG. That is, the outer peripheral side flow path forming member 18 forms a flow path for the cooling oil W flowing in the lower side of the coil end 7 to flow in the circumferential direction along the coil end 7.
Thus, by providing the outer peripheral side flow path forming member 18 and preventing the cooling oil W from dripping or falling to the outer peripheral side, in addition to the effects of the first embodiment, the outer peripheral side and the lower side of the coil end 7 However, the contact between the cooling oil W and the coil end 7 can be maintained, and the cooling efficiency can be further increased.

  In addition, the outer peripheral side flow path forming member 18 may be combined with the inner peripheral side flow path forming member 8 of the second embodiment instead of being combined with the inner peripheral side flow path forming member 8 of the first embodiment. Moreover, you may form outer periphery side flow-path formation member 18 itself in another shape. For example, as shown in FIG. 10, it is good also as a shape which covers to the upper part rather than the horizontal line L. FIG. In this case, the upper end 18 a side of the outer peripheral side flow path forming member 18 is preferably discontinuous so that the cooling oil W can flow directly to the coil end 7. Assuming a configuration in which the lower end of the outer peripheral side flow path forming member 18 is not immersed in the cooling oil W, the lower end 18b may be discontinuous so that the cooling oil W can flow downward.

(Fourth embodiment)
Hereinafter, the fourth embodiment will be described with reference to FIGS. 11 and 12.
In the fourth embodiment, a specific method for providing the flow path forming member will be described by taking the inner peripheral flow path forming member 8 of the first embodiment as an example.
As shown in FIG. 11, a general coil end 7 has a U-phase coil 6a disposed on the outermost peripheral side, an interphase insulating paper 20 disposed between the U-phase coil 6a and the V-phase coil 6b, and a V-phase. Interphase insulating paper 20 is also disposed between the coil 6b and the W-phase coil 6c. Thereby, the coil 6 of each phase is insulated.

  For example, as shown in FIG. 12, the interphase insulating paper 20 includes two main body portions 21 formed in a band shape and leg portions 22 that connect the main body portions 21. The leg portion 22 is formed substantially equal to the axial length of the stator core 5 and is inserted into a slot provided in the stator core 5. For this reason, the two main body portions 21 are disposed so as to protrude from both ends of the rotor core 10 in the axial direction. Accordingly, in the interphase insulating paper 20, the main body portion 21 is disposed between the coils 6 as shown in FIG. 11, and insulates between the coils 6 of each phase (that is, between the phases). In this embodiment, Nomex (registered trademark), which is an aramid fiber material, is employed as the interphase insulating paper 20.

Next, the manufacturing process of the stator 3 in the case where the inner peripheral flow path forming member 8 is provided will be described.
1) Slot insulation process: Insert slot insulation paper into the slots of the stator core 5. As shown in FIG. 1, the slot insulating paper slightly protrudes from the end face of the stator core 5, so that the finally formed coil end 7 has a stator core as shown in FIG. In a state of being separated from the end face of 5, the shape is distorted outward in the radial direction.

  2) Coil 6 winding step: After winding the U-phase coil 6a around the rotor core 10, the interphase insulating paper 20 for insulating between the U-phase and the V-phase is inserted, and the V-phase coil 6b is wound. Subsequently, the interphase insulating paper 20 for insulating between the V phase and the W phase is inserted, and then the W phase coil 6c is wound. That is, the coil 6 of each phase becomes U phase, V phase, and W phase in order from the outermost peripheral side of the stator core 5, and the W phase coil 6c is arranged on the innermost peripheral side.

  3) Flow path forming step: A plurality of interphase insulating papers 20 are arranged on the inner peripheral side of the W-phase coil 6c so that the main body portions 21 overlap each other. As described above, the plurality of main body portions 21 overlap with each other, so that the main body portion 21 is continuous in the circumferential direction along the inner peripheral surface of the coil end 7. At this time, the discontinuous portion 9 as shown in FIG. 4 is formed by not disposing the interphase insulating paper 20 around the lowermost end of the coil end 7.

  4) Intermediate molding process: The portion of the wound coil 6 that protrudes from the stator core 5 is directed outward in the radial direction of the stator core 5 in order to shorten the total length (axial length) of the stator 3. Expand and provisionally mold. Moreover, the neutral point of the coil 6 of each phase is connected. At this time, the interphase insulating paper 20 disposed between the coils 6 is formed (deformed) in accordance with the shape of the coil end 7, but the interphase insulating paper 20 that becomes the inner circumferential flow path forming member 8 is not formed.

5) Final shaping step: The temporarily formed coil 6 is finally formed, and the formed coil 6 is bound with a thread. However, the interphase insulating paper 20 that becomes the inner circumferential flow path forming member 8 is not tied with a thread. That is, the inner peripheral flow path forming member 8 remains in a state of facing the inner peripheral surface of the coil end 7 as shown in FIG.
6) Test process: Conducts an insulation test between the phases of the coil 6 and between the coil and the slot.
7) Impregnation step: The wire of the coil 6 is fixed by impregnating the final molded portion with varnish or the like.
Through these steps, the stator 3 of the embodiment is manufactured.

  The interphase insulating paper 20 is formed along the coil 6 of each phase. At this time, as is well known, each phase coil 6 is formed of a plurality of unit coils, and valley-shaped depressions are formed between the unit coils. Therefore, in FIG. 11, although the interphase insulating paper 20 is shown to be laminated inside the coil end 7 (so as to be a wall of the cooling oil W), the interphase insulating paper 20 is formed along the unit coil. Therefore, a gap that allows the cooling oil W to flow downward (flow indicated by an arrow Y2 in FIG. 2) is formed inside the coil end 7 even after impregnation with the varnish.

On the other hand, since the inner peripheral flow path forming member 8 is not molded as described above, it extends in the circumferential direction while facing the inner peripheral surface of the coil end 7. Therefore, the inner circumferential side flow path forming member 8 can prevent the cooling oil W from being vertically dropped or dropped from the inner circumferential side of the coil end 7, and can flow the cooling oil W along the coil end 7.
As described above, the inner peripheral flow path forming member 8 is formed of the same member as the interphase insulating paper 20.

  The stator 3 can be manufactured by the same process also when providing the outer peripheral side flow path forming member 18 as in the second embodiment. Specifically, before winding the U-phase coil 6 a, a plurality of interphase insulating papers 20 serving as the outer peripheral flow path forming member 18 are arranged in the circumferential direction so that the main body 21 is the outer periphery on the lower side of the coil end 7. Make it face the surface. Then, by not forming the outer peripheral flow path forming member 18 at the time of forming the coil end 7, the outer peripheral flow path forming member 18 faces the outer peripheral surface of the coil end 7, for example, as shown in FIG. In the state, it extends in the circumferential direction. Thereby, it is possible to prevent the cooling oil W from being vertical or falling from the outer peripheral side of the coil end 7 and to flow the cooling oil W along the coil end 7.

  Note that the end material of the interphase insulating paper 20 may be used instead of the flow path forming member and the interphase insulating paper 20 itself. As is well known, when the interphase insulating paper 20 is punched out of the belt-like insulating paper into a shape as shown in FIG. 12, the insulating paper existing between the legs 22 is discarded. Therefore, the parts that would otherwise be discarded are cut into a desired width, connected to each other to form a band shape, and arranged along the coil end 7 as a flow path forming member on the inner peripheral side or outer peripheral side. Also good. Thereby, while being able to use an end material effectively, the raise of the cost at the time of providing a flow-path formation member can be suppressed.

(Fifth embodiment)
The fifth embodiment will be described below with reference to FIG.
In the fifth embodiment, the configuration of the first flow path forming member is different from that of the first embodiment.
As shown in FIG. 13, the end plate 11 provided in the rotor 4 is formed in a disk shape that is coaxial with the rotor core 10, and is attached to the end surface of the rotor core 10, and the bottom 11 a. From the outer edge of the coil end 7 is provided on the side opposite to the rotor core 10 and has a cylindrical portion 11 b facing the coil end 7 on the inner peripheral side of the coil end 7. The end plates 11 are provided on both end surfaces of the rotor core 10 in the axial direction. In the present embodiment, the length of the cylindrical portion 11b in the axial direction is formed so as to cover the entire inner peripheral side of the coil end 7 and faces the inner peripheral surface of the coil end 7 in the entire area in the circumferential direction. ing. For this reason, the cooling oil W dripped or dropped from the coil end 7 is first restricted from moving in the vertical direction due to the presence of the end plate 11.

  Now, the cooling oil W that has flowed down to the end plate 11 flows in the circumferential direction on the surface of the cylindrical portion 11b when the end plate 11 is in a stationary state. On the other hand, when the rotating electrical machine 1 is in an operating state, the end plate 11 also rotates together with the rotor 4, so that the cooling oil W flowing on the surface of the cylindrical portion 11b is generated when the end plate 11 rotates. It is scattered outward by the centrifugal force generated. The scattered cooling oil W comes into contact with the inner peripheral surface of the coil end 7 because the coil end 7 exists at the tip. Even if the cooling oil W again falls on the end plate 11 after coming into contact with the inner peripheral surface of the coil end 7, the cooling oil W scatters toward the coil end 7 again. For this reason, even if the cooling oil W flows down to the end plate 11, it is scattered toward the coil end 7, or reciprocates between the end plate 11 and the coil end 7, and the coil end is moved downward. 7 will flow along.

  As described above, the end plate 11 of the present embodiment forms the first flow path in which the cooling oil W flows along the coil end 7 between the outer peripheral surface of the cylindrical portion 11 b and the inner peripheral surface of the coil end 7. It functions as a flow path forming member. Thereby, since the flow path through which the cooling oil W flows along the coil end 7 is formed and the cooling oil W and the coil end 7 can be brought into contact with each other, the cooling efficiency of the stator 3 can be increased.

  In addition, although illustration is abbreviate | omitted, you may combine the end plate 11 of this embodiment, and the outer peripheral side flow-path formation member 18 shown in 3rd Embodiment. According to such a structure, the flow path for flowing the cooling oil W along the coil end 7 is formed on both the inner peripheral side and the outer peripheral side of the coil end 7, thereby improving the cooling efficiency of the stator 3. be able to. Moreover, although illustration is abbreviate | omitted, you may combine the end plate 11 of this embodiment, and the inner peripheral side flow-path formation member 8 shown in 1st Embodiment. According to such a configuration, the cooling oil W that has flowed over the inner peripheral flow path forming member 8 and has flowed to the inner peripheral side can be moved toward the coil end 7. Therefore, the cooling efficiency of the stator 3 can be increased. Of course, you may combine the end plate 11, the inner peripheral side flow path formation member 8, and the outer peripheral side flow path formation member 18. FIG.

(Sixth embodiment)
The sixth embodiment will be described below with reference to FIG.
The sixth embodiment differs from the first embodiment in that a third flow path forming member is provided.
As shown in FIG. 14, the stator 3 according to the present embodiment includes an end face side flow path forming member 30 (a third end) in a gap between the end face of the coil end 7 on the stator 3 side and the end face of the stator 3. Corresponding to a flow path forming member). The end face side flow path forming member 30 is formed of the interphase insulating paper 20 in the same manner as that shown in the fourth embodiment. In this case, the end face side flow path forming member 30 is provided in the stator core 5 before the U-phase coil 6a is wound. Further, the end face side flow path forming member 30 is provided to extend in the circumferential direction in a range including at least a position where the cooling oil W above the horizontal line of the coil end 7 flows down.

  Since the end surface side flow path forming member 30 is formed longer than the circumferential length of the coil end, the cooling oil W flowing down to the coil end 7 is separated from the end surface of the coil end 7 on the stator core 5 side. The entry (inflow) into the gap between the end surfaces of the stator core 5, that is, the flow indicated by the arrow Y <b> 3 in FIG. 2 is restricted. For this reason, the cooling oil W whose entry into the gap is restricted flows to the side opposite to the stator core 5. That is, the end face side flow path forming member 30 restricts the cooling oil W from flowing between the end face of the coil end 7 and the end face of the stator core 5, so that the cooling oil W extends along the coil end 7. It functions as a third flow path forming member that forms a flow path. As a result, the cooling oil W flowing down to the coil end 7 has a relatively large flow indicated by arrows Y1 and Y2 in FIG. That is, the amount of the cooling oil W flowing along the coil end 7 is relatively increased. Therefore, the contact between the cooling oil W and the coil end 7 can be maintained, and the cooling efficiency of the stator 3 can be increased.

  In this case, although illustration is omitted, it is of course possible to combine the end face side flow path forming member 30 with the inner peripheral side and outer peripheral side flow path forming members described in the above embodiment. Further, the interphase insulating paper 20 that becomes the outer peripheral flow path forming member 18 is provided in the entire circumferential direction so that the interphase insulating paper 20 above the horizontal line L does not follow the outer peripheral surface of the coil end 7. That is, when the coil end 7 is formed, the end surface side flow path forming member 30 is temporarily escaped in the axial direction, and finally the varnish treatment is performed to form the end surface side flow path forming member 30. It is good also as a structure. Further, for example, a member having a shape having one main body portion 21 and a leg portion 22 is used in the correlation insulating paper 20 shown in FIG. 12, and the end face side flow path forming member 30 is attached after the coil end 7 is formed. It is good also as a structure.

(Other embodiments)
The present invention is not limited to those exemplified in the above-described embodiments, and for example, the following modifications and expansions can be performed.
In each embodiment, the flow path forming members on the inner peripheral side and the outer peripheral side are configured to cover the inner peripheral surface and the outer peripheral surface of the coil end 7, but other shapes may be used. For example, as shown in FIG. 15, an auxiliary portion 8 a that extends the length of the inner circumferential flow path forming member 8 and covers the end surface in the axial direction of the coil end 7 (the end surface opposite to the stator core 5) is provided. May be. By adopting such a configuration, it is possible to prevent the cooling oil W from getting over the coil end 7 and entering the inner peripheral side. Similarly, an auxiliary portion that covers the end surface of the coil end in the axial direction may be provided for the outer peripheral side flow path forming member 18 as well.

  The flow path forming member may be provided in a state slightly separated from the coil end 7. When the flow path forming member and the coil end 7 are in close contact with each other, the cooling oil W may get over the flow path forming member and enter the inner peripheral side. Therefore, by setting the flow path forming member slightly apart from the coil end 7, the cooling oil W can be prevented from getting over the flow path forming member and entering the inner peripheral side, and the flow path forming member and the coil end can be prevented. Since the cooling oil W flows into the space between the cooling oil W and the coil end 7, the contact between the cooling oil W and the coil end 7 can be maintained. In this case, the space between the flow path forming member and the coil end 7 may be appropriately set based on the flow rate of the cooling oil W so that the cooling oil W does not overflow.

As a material of the interphase insulating paper 20, a material other than Nomex (registered trademark) shown in the fourth embodiment may be used. For example, it may be possible to employ a polyphenylene sulfide (PPS) resin having excellent heat resistance and chemical resistance.
In the fourth embodiment, the flow path forming member has the same shape as the interphase insulating paper 20, but may have another shape. For example, the main body portion 21 may be further horizontally long. Or you may arrange | position the flow-path formation member formed in the strip | belt shape in the inner peripheral side of the coil end 7, or an outer peripheral side.

The rotating electrical machine 1 may be an induction motor provided with a conductor such as aluminum or copper, or may be a generator or the like instead of the motor.
The inner peripheral flow path forming member 8 may be formed longer than the axial length of the coil end 7. According to such a configuration, even if the cooling oil W flowing on the surface of the coil end 7 as indicated by the arrow Y2 in FIG. 2 increases, the cooling oil W can flow along the coil end 7. Further, the inner circumferential flow path forming member 8 may be formed to be shorter than the axial length of the coil end 7. In this case, although there is a possibility that the cooling oil W may fall vertically, the amount of the cooling oil W that falls drastically can be reduced, so that the cooling efficiency is increased as compared with the case where the inner peripheral flow path forming member 8 is not provided. be able to.
The refrigerant is not limited to ATF. Further, the refrigerant may be a gas as long as it is a fluid.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 1 is a rotating electrical machine, 2 is a housing, 3 is a stator, 4 is a rotor, 5 is a stator core, 6 is a coil, 7 is a coil end, and 8 is an inner peripheral flow path forming member (first , 9 and 17 are discontinuous portions, 10 is a rotor core, 11 is an end plate, 11a is a bottom portion, 11b is a cylindrical portion, 12 is a shaft, and 18 is an outer peripheral flow passage forming member (second member). , 20 is an interphase insulating paper, 30 is an end face side flow path forming member (third flow path forming member), L is a horizontal line, O is the center, and W is cooling oil (refrigerant).

Claims (9)

A stator core,
A coil wound around the stator core;
Coil ends respectively formed over the entire region in the circumferential direction on both end surfaces of the stator core by projecting a part of the coil from both axial ends of the stator core;
A first flow path forming member that is provided on the inner peripheral side of the coil end so as to face the inner peripheral surface of the coil end, and that forms a flow path along which the coolant for cooling the coil flows. When,
A stator characterized by comprising:   The first flow path forming member has at least one discontinuous portion formed at a position below a virtual horizontal line passing through the center of the stator in a state where the stator is installed. The stator according to claim 1.   The first flow path forming member is formed so as to face the coil end at least in a range above a virtual horizontal line passing through the center of the stator in a state where the stator is installed. The stator according to claim 1, wherein the stator is provided.   A second flow path that is provided on the outer peripheral side of the coil end and extends in the circumferential direction so as to face the coil end, and forms a flow path through which the coolant that cools the coil flows along the coil end The stator according to any one of claims 1 to 3, further comprising a forming member.   The second flow path forming member is formed so as to face the coil end at least in a range below a virtual horizontal line passing through the center of the stator in a state where the stator is installed. The stator according to claim 4, wherein: The coil end is formed away from an end surface of the stator core,
By restricting the flow of the refrigerant between the end surface of the coil end on the stator side and the end surface of the stator core, a third flow path is formed in which the refrigerant flows along the coil end. The stator according to any one of claims 1 to 5, further comprising a flow path forming member.   7. The stator according to claim 1, wherein interphase insulating paper is used as the flow path forming member to insulate the coils when a plurality of phases of the coils are provided. . A stator core,
A coil wound around the stator core;
Coil ends respectively formed over the entire region in the circumferential direction on both end surfaces of the stator core by projecting a part of the coil from both axial ends of the stator core;
A rotor core provided on the inner peripheral side of the stator core and coaxial with the stator core;
Formed in the shape of a disk coaxial with the rotor core, and attached to the end surface of the rotor core, and rises from the outer edge of the bottom to the opposite side of the rotor core, and is on the inner peripheral side of the coil end A cylindrical portion facing the coil end, and end plates provided on both end faces of the rotor core, respectively,
The end plate is a first flow path forming member that forms a flow path between the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the coil end along which the coolant that cools the coil flows. Rotating electric machine characterized by functioning as   A second flow path that is provided on the outer peripheral side of the coil end and extends in the circumferential direction so as to face the coil end, and forms a flow path through which the coolant that cools the coil flows along the coil end The rotating electrical machine according to claim 8, further comprising a forming member.

Images