TW201815034A - Rotary electrical machinery and stator of which - Google Patents

Abstract

A stator (30) of a rotary electrical machinery (100-1) of this invention includes a stator core (31) and a refrigerant flow passage (2) provided on an outer peripheral portion of the stator core (31). The refrigerant flow passage (2) has a first annular groove extending toward a circumferential direction of a central axis of the stator core (31), a second annular groove which is adjacent to the first annular groove and extends toward the circumferential direction, a third annular groove which is adjacent to the second annular groove and extends toward the circumferential direction, a first communicating groove communicating the first annular groove and the second annular groove, and a second communicating groove communicating the second annular groove and the third annular groove. The positions of the first communication groove and the second communication groove in the circumferential direction are shifted from each other.

Description

 Rotating electric machine and stator of rotating electric machine  

The present invention relates to a rotating electrical machine and a stator of a rotating electrical machine that are cooled by a cooling medium.

The motor disclosed in Patent Document 1 includes: a stator core in which a coil is wound; a first frame provided on an outer circumferential surface of the stator core; and a second body disposed in contact with an outer circumferential surface of the first frame frame. In the second frame system, an inlet and an outlet of the refrigerant liquid are provided, and a supply pipe for supplying the refrigerant liquid is connected to the inlet, and a recovery pipe for recovering the refrigerant liquid is connected to the outlet. An annular refrigerant liquid groove is formed between the first frame and the second frame so as to extend in the circumferential direction of the stator core, and an inflow port and an outflow port are connected to the refrigerant liquid groove. The refrigerant liquid supplied from the inflow port to the refrigerant liquid groove is circulated inside the refrigerant liquid groove, and then discharged from the outlet port and collected in the recovery pipe. As described above, the refrigerant liquid is circulated in the refrigerant liquid groove, whereby the stator core is cooled.

 [Previous Technical Literature]    [Patent Literature]  

Patent Document 1: Japanese Patent Laid-Open Publication No. 2003-199291

However, in the electric motor disclosed in Patent Document 1, in the process in which the refrigerant liquid supplied from the inflow port to the refrigerant liquid groove flows toward the outflow port, the refrigerant is formed on the outer peripheral portion of the first frame, so that the refrigerant is cooled. The amount of heat exchange between the liquid and the motor is reduced, and the cooling efficiency of the motor is lowered. Therefore, in the electric motor disclosed in Patent Document 1, the longer the length of the stator core in the axial direction is, the longer the refrigerant flow path through which the refrigerant liquid flows, and the problem that the required cooling efficiency cannot be obtained.

The present invention has been made in view of the above problems, and an object thereof is to obtain a rotary electric machine capable of suppressing a decrease in cooling efficiency.

In order to solve the above-described problems and achieve the object, the stator of the rotating electric machine according to the present invention includes a stator core and a refrigerant flow path provided in an outer peripheral portion of the stator core. The refrigerant flow path has a first annular groove. Extending in a circumferential direction of a central axis of the stator core; the second annular groove is adjacent to the first annular groove and extends in a circumferential direction; and the third annular groove is adjacent to the second annular groove and facing the circumference a direction extending; the first communication groove connects the first annular groove and the second annular groove; and the second communication groove connects the second annular groove and the third annular groove; and the first communication The positions of the groove and the second communication groove in the circumferential direction are deviated from each other.

The rotary electric machine of the present invention achieves an effect of suppressing a decrease in cooling efficiency.

1‧‧‧ arrow

2, 2A, 2B, 2C‧‧‧ refrigerant flow path

10,10A,10B,10C,10D,10E,10F,10G,10H,10I‧‧‧first tubular member

11,55‧‧‧ Inner Week

12,35,54‧‧‧The outer part

13,60,68,77‧‧‧ supply annular groove

14,61,69,78‧‧‧Draining the annular groove

15,62,70,79‧‧‧Intermediate annular groove

16a, 31a, 53a‧‧‧ end face

16b, 31b, 53b‧‧‧ another end face

17a, 56a‧‧‧first sealed trench

17b, 56b‧‧‧second sealing groove

18‧‧‧ Sealing members

19,63,71,80‧‧‧Supply connection groove

20,64,72,81‧‧‧Intermediate connecting groove

21,73,82‧‧‧Draining connection groove

22,22A,57,65,74‧‧‧first protrusion

22a, 23a, 24a, 34a‧‧‧ one end

22b, 23b, 24b, 34b‧‧‧ other end

23,23A,58,66,75‧‧‧second protrusion

24, 24A, 59, 67, 76‧‧‧ third protrusion

25‧‧‧ front end

26, 28, 51‧‧‧ refrigerant supply port

27,29,52‧‧‧Refrigerant discharge

30, 30A, 30B‧‧‧ Stator

31, 31A‧‧‧ Stator core

31A1‧‧‧The first core block

31A2‧‧‧Second core block

31A3‧‧‧The third core block

33‧‧‧Coil insertion hole

34‧‧‧ coil

50, 50A‧‧‧ second tubular member

90‧‧‧Rotor

91‧‧‧Rotor core

92‧‧‧ shaft

100-1,100-2,100-3,100-4‧‧‧Rotating motor

AX‧‧‧ central axis

D1‧‧‧ axis direction

D2‧‧‧ week direction

D3‧‧‧path direction

P‧‧‧configuration pitch

Fig. 1 is a cross-sectional view showing a rotary electric machine according to a first embodiment of the present invention.

Fig. 2 is a perspective view of the stator core shown in Fig. 1.

Fig. 3 is a perspective view of the second cylindrical member shown in Fig. 1.

Fig. 4 is a perspective view of the first tubular member shown in Fig. 1.

Fig. 5 is a view showing the outer peripheral portion of the first tubular member shown in Fig. 4.

Fig. 6 is an enlarged view of the first cylindrical member shown in Fig. 1 and the second cylindrical member.

Fig. 7 is a view showing a first modification of the first tubular member shown in Fig. 5.

Fig. 8 is a view showing a second modification of the first tubular member shown in Fig. 5.

Fig. 9 is a view showing a third modification of the first tubular member shown in Fig. 5.

Fig. 10 is a view showing a fourth modification of the first tubular member shown in Fig. 5.

Figure 11 is a cross-sectional view showing a rotary electric machine according to a second embodiment of the present invention.

Fig. 12 is a perspective view of the second cylindrical member shown in Fig. 11.

Figure 13 is a cross-sectional view showing a rotary electric machine according to a third embodiment of the present invention.

Fig. 14 is a perspective view of the stator core shown in Fig. 13.

Figure 15 is a cross-sectional view showing a rotary electric machine according to a fourth embodiment of the present invention.

Fig. 16 is a view showing the inner peripheral portion of the first cylindrical member shown in Fig. 15.

Hereinafter, the stator of the rotating electrical machine and the rotating electrical machine according to the embodiment of the present invention will be described in detail with reference to the drawings. Further, the present invention is not limited to the embodiment.

 Embodiment 1  

Fig. 1 is a cross-sectional view showing a rotary electric machine according to a first embodiment of the present invention. Fig. 2 is a perspective view of the stator core shown in Fig. 1. Fig. 3 is a perspective view of the second cylindrical member shown in Fig. 1. Fig. 4 is a perspective view of the first tubular member shown in Fig. 1. Fig. 5 is a view showing the outer peripheral portion of the first tubular member shown in Fig. 4. Fig. 6 is an enlarged view of the first cylindrical member shown in Fig. 1 and the second cylindrical member.

As shown in Fig. 1, the rotary electric machine 100-1 of the first embodiment includes a cylindrical stator 30 and a rotor 90 provided inside the stator 30. The stator 30 includes a first cylindrical member 10, a cylindrical stator core 31 provided in the inner peripheral portion 11 of the first tubular member 10, and a second stator 10 provided on the outer peripheral portion 12 of the first tubular member 10. The tubular member 50. The rotor 90 includes a cylindrical rotor core 91 provided inside the stator core 31 and a shaft 92 penetrating the rotor core 91 in the axial direction D1 of the central axis AX of the stator core 31.

Each of the rotor core 91 and the stator core 31 is configured such that a plurality of laminated sheets are pressed into a ring-shaped thin plate from an electromagnetic steel base material. The plurality of sheets are fastened to each other by riveting, welding or subsequently. As shown in FIG. 2, the stator core 31 is formed with a plurality of coil insertion holes 33 arranged in the circumferential direction D2 of the central axis AX of the stator core 31. Each of the plurality of coil insertion holes 33 extends in the axial direction D1 and penetrates from one end surface 31a of the stator core 31 to the other end surface 31b. As shown in Fig. 1, each of the plurality of coil insertion holes 33 is wound with a coil 34, and one end portion 34a of the coil 34 in the axial direction D1 protrudes from one end surface 31a of the stator core 31, and the axial direction The other end portion 34b of the coil 34 in D1 protrudes from the other end surface 31b of the stator core 31.

The material of the first cylindrical member 10 and the second cylindrical member 50 may, for example, be an aluminum alloy, an austenitic stainless steel, a copper alloy, cast iron, steel or an iron alloy. At the time of manufacture of the rotary electric machine 100-1, the coil 34 is wound around the stator core 31 so that the first cylindrical member 10 is thermally clamped around the outer peripheral portion 35 of the stator core 31 of the coil 34, and the second cylinder is made The member 50 is assembled to the outer peripheral portion 12 of the first tubular member 10.

The second cylindrical member 50 is formed with a refrigerant supply port 51 and a refrigerant discharge port 52 that supplies a cooling medium (refrigerant) between the first cylindrical member 10 and the second cylindrical member 50. The refrigerant discharge port 52 discharges the refrigerant supplied between the first cylindrical member 10 and the second cylindrical member 50. In the case of a refrigerant, water or an antifreeze solution can be exemplified. In the figure, the arrow 1 indicates the flow direction of the refrigerant.

The refrigerant supply port 51 is formed in the axial direction D1 near the one end surface 53a of the second cylindrical member 50, and the refrigerant discharge port 52 is formed in the axial direction D1 near the other end surface 53b of the second cylindrical member 50. Each of the refrigerant supply port 51 and the refrigerant discharge port 52 penetrates from the outer peripheral portion 54 of the second tubular member 50 to the inner peripheral surface 55 of the second cylindrical member 50.

In the third drawing, the refrigerant supply port 51 and the refrigerant discharge port 52 are connected to a pipe extending from a cooling device (not shown). The cooling device collects the refrigerant passing through the rotary electric machine 100-1 and cools the recovered refrigerant, and then sends the refrigerant to the rotating electric machine 100-1 again.

In the first outer peripheral portion 12 of the first tubular member 10, the supply annular groove 13 and the refrigerant of the first tubular member 10 are formed in the outer peripheral portion 12 of the first tubular member 10. The discharge port 52 communicates with the discharge annular groove 14 and a plurality of intermediate annular grooves 15. In the first embodiment, 15 intermediate annular grooves 15 are formed in the first tubular member 10. Further, even if the number of the intermediate annular grooves 15 is less than 15 or 15 or more, the effects of the present embodiment can of course be obtained.

The supply annular groove 13 is formed in an annular groove which is formed in the axial direction D1 close to the one end surface 16a of the first cylindrical member 10, that is, on the most upstream side and extends in the circumferential direction D2. The discharge annular groove 14 is formed at a position close to the other end surface 16b of the first cylindrical member 10 in the axial direction D1, that is, a groove-shaped groove which is measured at the most downstream and extends in the circumferential direction D2. The plurality of intermediate annular grooves 15 are formed between the supply annular groove 13 and the discharge annular groove 14 so as to be spaced apart from each other in the axial direction D1, and are groove-shaped grooves extending in the circumferential direction D2.

The outer peripheral portion 12 of the first tubular member 10 is formed with an annular first seal groove 17a extending in the circumferential direction D2 and an annular second seal groove 17b extending in the circumferential direction D2. The first seal groove 17a is formed between the one end surface 16a of the first cylindrical member 10 and the supply annular groove 13. The second seal groove 17b is formed between the other end surface 16b of the first cylindrical member 10 and the discharge annular groove 14. An annular seal member 18 is fitted to the first seal groove 17a and the second seal groove 17b. Thereby, it is possible to prevent the refrigerant flowing between the first tubular member 10 and the second tubular member 50 from leaking from the one end surface 16a and the other end surface 16b of the first tubular member 10.

4 and 5 are views for explaining the first cylindrical member 10. In Fig. 5, the flow direction of the refrigerant is schematically indicated by an arrow 1. The first tubular member 10 is formed with a supply communication groove 19 belonging to the first communication groove that connects the annular groove 13 and the intermediate annular groove 15 adjacent to each other in the axial direction D1; and is adjacent to the axis direction D1. The intermediate communication groove 20 in which the intermediate annular grooves 15 communicate with each other; and the discharge communication groove 21 belonging to the second communication groove that connects the intermediate annular groove 15 and the discharge annular groove 14 which are adjacent to each other in the axial direction D1. In the present embodiment, a plurality of the supply communication grooves 19, the intermediate communication grooves 20, and the discharge communication grooves 21 are provided. However, at least the intermediate communication grooves 20 and the discharge communication grooves 21 may be provided. Further, the width of the circumferential direction D2 of each of the supply communication groove 19, the intermediate communication groove 20, and the discharge communication groove 21 is formed to be equal in the present embodiment, but may be unequal.

The intermediate communication groove 20 formed in the odd-numbered intermediate annular grooves 15 from the one end surface 16a side of the first cylindrical member 10 among the fifteen intermediate annular grooves 15 is arranged in the axial direction D1 and the discharge communication groove 21 Always online. The intermediate communication groove 20 formed in the even-numbered intermediate annular grooves 15 from the one end surface 16a side of the first tubular member 10 is aligned with the supply communication groove 19 in a straight line in the axial direction D1.

The annular groove 13, the discharge annular groove 14, the intermediate annular groove 15, the first seal groove 17a, and the second seal groove 17b are supplied, and the outer peripheral portion 12 of the first tubular member 10 is looped along the circumferential direction D2. Formed by cutting. The supply communication groove 19, the intermediate communication groove 20, and the discharge communication groove 21 are formed by cutting the outer peripheral portion 12 of the first cylindrical member 10 in the axial direction D1. By forming the supply annular groove 13, the discharge annular groove 14, the intermediate annular groove 15, the supply communication groove 19, the intermediate communication groove 20, and the discharge communication groove 21, the first cylindrical member 10 is formed in the circumferential direction. A plurality of first protrusions 22, second protrusions 23, and third protrusions 24 arranged in D2. That is, the wall portion for supplying the annular groove 13, the discharge annular groove 14, the intermediate annular groove 15, the supply communication groove 19, the intermediate communication groove 20, and the discharge communication groove 21 is constituted by the first protrusion 22 and the second protrusion 23 And the third protrusion 24 is formed.

The first projection 22 is formed between the supply annular groove 13 and the intermediate annular groove 15 adjacent to each other in the axial direction D1. The second projections 23 are formed between the intermediate annular grooves 15 adjacent to each other in the axial direction D1. The third projection 24 is formed between the intermediate annular groove 15 adjacent to the axial direction D1 and the discharge annular groove 14.

As shown in Fig. 5, the communication grooves in the annular groove adjacent to the upstream side and the downstream side are arranged to be displaced in the circumferential direction D2, and the refrigerant is supplied to the refrigerant supply port 51, the supply annular groove 13, and a plurality of When the intermediate annular groove 15 and the discharge annular groove 14 and the refrigerant discharge port 52 are distributed from the upstream side to the downstream side, the refrigerant flows from the upstream side groove to the downstream side groove through the Z-shaped path.

When the communication groove in the annular groove adjacent to the upstream side and the downstream side is not disposed to deviate in the circumferential direction D2, that is, when the present embodiment is not employed, the refrigerant does not flow through the Z-shaped path. Therefore, the refrigerant does not flow in the circumferential direction D2, but flows through the communication groove from the upstream side to the downstream side in the axial direction D1, so that the effect of the present embodiment cannot be obtained.

Further, in the present embodiment, the paths through which the refrigerant continuously flows in the circumferential direction D2 are equal in each of the supply annular groove 13, the intermediate annular groove 15, and the discharge annular groove 14. That is, in the present embodiment, the number of the communication grooves and the arrangement interval of the flow grooves are equal in each of the annular grooves. The shape of the flow groove, the number of the flow grooves, and the arrangement interval of the flow grooves are regularly set, whereby the heat exchange performance from the upstream side to the downstream side can be made uniform, and the manufacturing cost can be lowered. effect.

The first projection 22 and the second projection 23 which are adjacent to each other in the axial direction D1 are such that the positions of the one end portions 22a and 23a in the circumferential direction D2 are shifted from each other, and the plurality of supply communication grooves 19 and the intermediate communication groove adjacent to each other in the axial direction D1. The 20 series are arranged in a staggered shape along the circumferential direction D2.

The second protrusions 23 adjacent to each other in the axial direction D1 are mutually offset from each other in the circumferential direction D2, and the plurality of intermediate communication grooves 20 adjacent to each other in the axial direction D1 are arranged along the circumferential direction D2. Staggered.

The second protrusions 23 and the third protrusions 24 adjacent to each other in the axial direction D1 are such that the positions of the one end portions 23a, 24a in the circumferential direction D2 are shifted from each other, and the plurality of intermediate communication grooves 20 adjacent to each other in the axial direction D1 are discharged. The communication grooves 21 are arranged in a staggered manner along the circumferential direction D2.

Fig. 6 shows the front end 25 of the first projection 22, the second projection 23, and the third projection 24 from the radial direction D3 of the first cylindrical member 10 to the inner peripheral portion 55 of the second cylindrical member 50. Between the gap δ, the supply annular groove 13 of the radial direction D3 of the first tubular member 10, the respective depths d of the discharge annular groove 14 and the intermediate annular groove 15, and the supply annular groove 13 and the discharge ring in the axial direction D1. The respective widths w of the groove 14 and the intermediate annular groove 15 and the arrangement pitch p of the protrusions adjacent to each other in the axial direction D1.

Next, the refrigerant flow path 2 formed between the first cylindrical member 10 and the second cylindrical member 50 will be described. The refrigerant flow path 2 shown in Fig. 1 is a flow path through which the refrigerant flows between the first tubular member 10 and the second tubular member 50, and is supplied with the annular groove 13 and the intermediate annular groove. 15. The annular groove 14, the supply communication groove 19, the intermediate communication groove 20, the discharge communication groove 21, and the gap δ are discharged.

The refrigerant sent from the cooling device (not shown) is supplied to the refrigerant flow path 2 via the refrigerant supply port 51, and when passing through the refrigerant flow path 2, heat is performed between the first cylindrical member 10 and the second cylindrical member 50. exchange. The refrigerant whose temperature rises due to heat exchange is supplied to the above-described cooling device through the refrigerant discharge port 52. The refrigerant is circulated between the cooling device and the rotary electric machine 100-1, whereby the first tubular member 10 heated by the heat generated by the stator core 31 is cooled to suppress the temperature rise of the rotary electric machine 100-1.

Hereinafter, the refrigerant flowing through the refrigerant supply port 51 will flow through the supply annular groove 13, the supply communication groove 19, the intermediate annular groove 15, the intermediate communication groove 20, the discharge annular groove 14, and the discharge communication groove 21.

Fig. 5 shows a refrigerant supply port 51 that communicates with the supply annular groove 13 and a refrigerant discharge port 52 that communicates with the discharge annular groove 14. The refrigerant supplied through the refrigerant supply port 51 is supplied to the supply annular groove 13, and is branched in one side and the other in the circumferential direction D2 in the supply annular groove 13, and flows throughout the entire circumference of the supply annular groove 13. When the refrigerant passes through the supply passage 19, the refrigerant that flows in the opposite direction to the circumferential direction D2 collides with each other and merges, so that the flow of the refrigerant in the vicinity of the supply passage 19 is turbulent. Further, even if the direction of the flow path is changed such that the circulation in the circumferential direction D2 flows in the normal axial direction D1, turbulence occurs.

The refrigerant supplied to the communication groove 19 is supplied from the one end surface 16a side of the first cylindrical member 10 to the first intermediate annular groove 15, that is, the intermediate annular groove 15 on the most upstream side. The refrigerant supplied to the first intermediate annular groove 15 is branched in one of the first intermediate annular grooves 15 in the circumferential direction D2 and flows along the first intermediate annular groove 15. When the refrigerant that has flowed in the circumferential direction D2 passes through the first intermediate communication groove 20 from the one end surface 16a side of the first tubular member 10, it collides with each other in the opposite direction when colliding with the circumferential direction D2 in the same manner as when the communication groove 19 is supplied. Since the refrigerant changes the direction of the flow path, the circulation of the refrigerant in the vicinity of the first intermediate communication groove 20 causes turbulence.

In the same manner, the refrigerant flows to the discharge annular groove 14 in a state where the refrigerant flows in the vicinity of each of the flow passages while flowing through the respective annular grooves from the upstream side to the downstream side.

The refrigerant passing through the discharge communication groove 21 is supplied to the discharge annular groove 14 on the downstream side. The refrigerant supplied to the discharge annular groove 14 is branched in the circumferential direction D2 and spread over the entire circumference of the discharge annular groove 14, and then supplied to a cooling device (not shown) through the refrigerant discharge port 52.

As described above, when the refrigerant passes through the supply communication groove 19, the intermediate communication groove 20, and the discharge communication groove 21, turbulent flow is generated, whereby the vicinity of the surface of the stator core 31 belonging to the heat generating portion is formed in each of the communication grooves (that is, the flow is close to The high-temperature refrigerant (temperature boundary layer) in the region of the bottom surface of each groove is mixed with a low-temperature refrigerant that flows in a position away from the heat generating portion (that is, a region that flows away from the bottom surface of each groove). Thereby, the development of the refrigerant temperature boundary layer is suppressed, the amount of heat exchange between the refrigerant and the rotary electric machine 100-1 is improved, and the cooling efficiency of the rotary electric machine 100-1 is improved.

Here, the size of each of the gap δ, the depth d, and the width w shown in FIG. 6 will be described. The narrower the gap δ, the more the flow rate of the refrigerant flowing inside the intermediate annular groove 15 increases. In other words, the amount of refrigerant flowing through the second projection 23 constituting the intermediate annular groove 15 in the axial direction D1 is reduced, so that the flow rate of the refrigerant flowing through the longer flow path can be increased and the cooling efficiency can be improved, thereby eliminating the gap δ. More ideal. However, when the gap δ is eliminated, when the second cylindrical member 50 is assembled to the first tubular member 10, the first projection 22, the second projection 23, and the third projection 24 are easily caught, and assembly workability is lowered. Further, when the first projections 22, the second projections 23, and the third projections 24 are bent during work, the refrigerant flow path is narrowed and the cooling efficiency may be lowered. In order to suppress the reduction in assembly workability and cooling efficiency, it is preferable to provide a slight gap δ between the first tubular member 10 and the second tubular member 50. As an example of the size of the gap δ, 0.05 mm to 1.5 mm can be exemplified. More preferably, it is in the range of 0.05 mm to 0.3 mm.

Further, the ratio (w/d) of the width w and the depth d of the intermediate annular groove 15 can be exemplified as 5 to 10. In the case where the ratio (d/δ) of the depth d and the gap δ of the intermediate annular groove 15 is 15 to 200, it is confirmed that the annular groove from the upstream side to the downstream side can be prevented from passing over the second protrusion. In the refrigerant flowing in the axial direction D1, it is possible to sufficiently obtain the effect that the refrigerants flowing in the opposite directions in the circumferential direction D2 collide with each other to cause turbulence, and exhibit high cooling efficiency.

Further, the width w and the depth d of the supply annular groove 13, the discharge annular groove 14, and the intermediate annular groove 15 may be different from each other. By setting the size of the depth d of each annular groove to a different value, the frequency of occurrence of the turbulent flow of the refrigerant in the vicinity of the supply communication groove 19, in the vicinity of the intermediate communication groove 20, and in the vicinity of the discharge communication groove 21 can be changed. Further, the cross-sectional shape of the supply annular groove 13, the intermediate annular groove 15, and the discharge annular groove 14 may be any of a rectangular shape, a triangular shape, and a curved shape.

Further, the gaps δ from the respective distal ends 25 of the first projections 22, the second projections 23, and the third projections 24 to the inner peripheral portion 55 of the second cylindrical member 50 may be different from each other. Further, the arrangement pitch p of the first protrusions 22, the second protrusions 23, and the third protrusions 24 adjacent to each other in the axial direction D1 may be set to a size corresponding to the heat generation distribution obtained in advance.

In the present embodiment, in the first cylindrical member 10 shown in Fig. 5, since the positions of the communication grooves adjacent to each other in the axial direction D1 are deviated from each other in the circumferential direction D2, when the refrigerant is in the circumferential direction At the time of D2 circulation, heat exchange with the stator core 31 is performed, and turbulent flow is generated when the refrigerant passes through the supply communication groove 19, the intermediate communication groove 20, and the discharge communication groove 21, thereby obtaining the effect of eliminating the temperature boundary layer. Therefore, the amount of heat exchange between the refrigerant and the stator core 31 is increased, and the stator core 31 is effectively cooled, so that the output of the rotary electric machine 100-1 can be increased and the size can be reduced.

Further, in the first tubular member 10 shown in FIGS. 4 and 5, the supply communication groove 19, the intermediate communication groove 20, and the discharge communication groove 21 are arranged at equal intervals along the circumferential direction D2, but the communication groove is supplied. 19. The intermediate communication groove 20 and the discharge communication groove 21 may be arranged as shown in Figs. 7 to 9 .

Fig. 7 is a view showing a first modification of the first tubular member shown in Fig. 5. The supply communication groove 19, the intermediate communication groove 20, and the discharge communication groove 21 formed in the first cylindrical member 10C shown in Fig. 7 are arranged from one end surface 16a of the first cylindrical member 10C toward the other end surface 16b. The spiral position, that is, the spiral shape from the upstream side toward the downstream side.

Fig. 8 is a view showing a second modification of the first tubular member shown in Fig. 5. The communication grooves formed in the respective annular grooves adjacent to each other in the axial direction D1 of the first tubular member 10D shown in Fig. 8 are arranged at unequal intervals in the circumferential direction D2. The intermediate communication groove 20 from the one end surface 16a of the first cylindrical member 10D to the odd-numbered intermediate annular grooves 15 may be arranged in a straight line in the axial direction D1 and the discharge communication groove 21. The intermediate communication groove 20 from the one end surface 16a side of the first cylindrical member 10D to the even-numbered intermediate annular grooves 15 may be arranged in a straight line in the axial direction D1 and the supply communication groove 19.

Fig. 9 is a view showing a third modification of the first tubular member shown in Fig. 5. The communication grooves formed in the annular grooves adjacent to each other in the axial direction D1 of the first tubular member 10E are arranged to be displaced at an unequal interval in the circumferential direction D2. From one end face 16a side of the first tubular member 10E to the first, seventh and thirteenth intermediate communication grooves 20, the second, eighth and fourteenth intermediate communication grooves 20, the third The ninth intermediate communication grooves 20 are arranged on a straight line in the axial direction D1. In other words, the through grooves are arranged to be offset from the upstream side toward the downstream side in the circumferential direction D2 at unequal intervals, and the communication grooves in the non-adjacent annular grooves are exemplified by at least one or more rings. The groove is arranged on the straight line in the axial direction D1. In the ninth diagram, the communication groove is arranged in a straight line shape in the axial direction D1 through the four annular grooves.

The first tubular members 10, 10C, 10D, and 10E are formed with the supply communication groove 19, the intermediate communication groove 20, and the discharge communication groove 21, that is, three types of communication grooves are formed, but at least the supply communication groove 19 is formed and discharged. The rotary electric machine 100-1 of the present embodiment can be realized by connecting the grooves 21. A specific example will be described using FIG.

Fig. 10 is a view showing a fourth modification of the first tubular member shown in Fig. 5. The first tubular member 10F shown in Fig. 10 is formed with the supply communication groove 19 and the discharge communication groove 21, but the intermediate communication groove 20 shown in Fig. 4 is not formed. The supply communication groove 19 and the discharge communication groove 21 are arranged in a staggered manner along the circumferential direction D2. An intermediate annular groove 15 is formed between the supply annular groove 13 and the discharge annular groove 14 of the first tubular member 10F. By forming the two types of communication grooves in the circumferential direction D2 as described above, the refrigerant turbulent flow is generated in each of the communication grooves, so that the stator core 31 can be efficiently cooled.

Further, even when the refrigerant flow path 2 shown in Fig. 1 grows in accordance with the length of the axial direction D1 of the first tubular member 10, the rotary electric machine 100-1 of the first embodiment is also supplied to the communication groove 19, in the middle. In each of the communication groove 20 and the discharge communication groove 21, turbulent flow of the refrigerant is generated, so that a decrease in cooling efficiency is suppressed.

In the example of Fig. 10, the example of the supply communication groove 19 and the discharge communication groove 21 is exemplified, but it is needless to say that the intermediate communication groove 20 may be the upstream side and the downstream side. When the upstream side and the downstream side communication groove are arranged to be displaced in the circumferential direction D2 in the three adjacent annular grooves, an effect of causing turbulent flow of the refrigerant in the vicinity of the communication groove can be obtained.

Further, the supply annular groove 13, the discharge annular groove 14, the intermediate annular groove 15, the supply communication groove 19, the intermediate communication groove 20, and the discharge communication groove 21 formed in the first tubular member 10 are provided in plural. The lathe machine tool (not shown) that rotates the machine shaft can be easily machined. This will be specifically described below. In order to increase the amount of heat exchange between the refrigerant and the rotary electric machine 100-1, a spiral groove or the like in which the supply annular groove 13, the intermediate annular groove 15, and the discharge annular groove 14 are connected in a spiral shape may be considered. The method of growing the refrigerant flow path. However, when the spiral groove is formed as described above, it is necessary to perform synchronous processing in which the rotation of the first tubular member 10 in the circumferential direction D2 and the movement of the rotary machining axis in the axial direction D1 are synchronized.

On the other hand, in the rotary electric machine 100-1 of the first embodiment, the simultaneous processing as described above is not required, and the supply of the annular groove 13, the discharge annular groove 14, and the intermediate annular groove 15 can be made by the first cylindrical shape. The member 10 is formed to rotate in the circumferential direction D2, and the supply communication groove 19, the intermediate communication groove 20, and the discharge communication groove 21 can be formed by moving the rotary machining shaft provided in the lathe machine tool in the axial direction D1. In other words, in the rotary electric machine 100-1 of the first embodiment, since the annular groove and the communication groove can be formed by linear processing, special processing such as synchronous machining is not required, and the existing linear processing can be effectively utilized. Lathe tool machine. Therefore, in the rotary electric machine 100-1 of the first embodiment, the processing of the first tubular member 10 is facilitated, the manufacturing time of the first tubular member 10 is shortened, and the manufacture of the first cylindrical member 10 can be reduced. cost.

Further, in the rotary electric machine 100-1 of the first embodiment, since the first tubular member 10 is formed with the supply communication groove 19, the intermediate communication groove 20, and the discharge communication groove 21, the cooling efficiency due to the occurrence of turbulent flow is improved. The effect will be higher than just growing the refrigerant flow path. Further, in the case where a spiral groove is formed as described above, the pressure loss when the refrigerant flows through the refrigerant flow path 2 is lowered. The pressure loss refers to an energy loss or friction loss per unit time flow rate when the refrigerant passes through the outer peripheral portion 12 of the first tubular member 10. When the refrigerant flow path is increased, the pressure loss is increased. Therefore, it is necessary to increase the capacity of the pump mounted on the cooling device (not shown) or to increase the amount of driving of the pump. In the rotary electric machine 100-1 of the first embodiment, since the cooling efficiency improvement effect due to the occurrence of turbulent flow is obtained, when the cooling efficiency is equal, the pressure loss can be reduced as compared with the case of the spiral groove, so that it is not The cooling efficiency is improved when the capacity of the pump mounted on the cooling device is increased or the driving amount of the pump is not increased. Therefore, according to the rotary electric machine 100-1 of the first embodiment, the rotary electric machine 100-1 which can improve the cooling efficiency while suppressing an increase in the manufacturing cost can be obtained.

In the rotary electric machine 100-1 of the first embodiment, a configuration example in which a plurality of communication grooves in the adjacent annular grooves are arranged in a staggered manner along the circumferential direction D2 on the upstream side and the downstream side, respectively, is described. However, if at least one of the communication grooves formed on the upstream side and the downstream side is displaced from each other in the circumferential direction D2, the cooling efficiency can be improved.

In the tenth diagram, when the positions in the circumferential direction D2 of one supply communication groove 19 and one discharge communication groove 21 are arranged to deviate from each other, the circulation of the refrigerant is disturbed in the vicinity of the supply communication groove 19 and in the vicinity of the discharge communication groove 21. Flow, so you can improve the cooling efficiency.

As described above, according to the rotary electric machine of the embodiment, the first annular groove, the second annular groove, and the third annular groove are connected to each other in the first annular groove and the second annular groove. The first communication groove and the second communication groove that communicates the second annular groove and the third annular groove are arranged to be displaced along the circumferential direction D2. Therefore, the refrigerant flowing through the first annular groove in the circumferential direction D2 passes through the first When the groove is connected, turbulent flow occurs, and when the refrigerant flowing through the second annular groove in the circumferential direction D2 passes through the second communication groove, turbulence occurs, so that the development of the temperature boundary layer can be suppressed, and cooling efficiency can be achieved. Improvement.

 Embodiment 2  

Figure 11 is a cross-sectional view showing a rotary electric machine according to a second embodiment of the present invention. Fig. 12 is a perspective view of the second cylindrical member shown in Fig. 11. The difference between the rotary electric machine 100-1 of the first embodiment and the rotary electric machine 100-2 of the second embodiment is as follows.

(1) The stator 30 of the rotary electric machine 100-2 includes a first cylindrical member 10G instead of the first tubular member 10, and a second cylindrical member 50A instead of the second cylindrical member 50.

(2) The first projection 22, the second projection 23, the third projection 24, the supply annular groove 13, the intermediate annular groove 15, and the discharge annular groove 14 are not provided in the first tubular member 10G.

(3) The inner peripheral portion 55 of the second cylindrical member 50A is formed with a first protrusion 57 corresponding to the first protrusion 22, a second protrusion 58 corresponding to the second protrusion 23, and a third protrusion 24 corresponds to the third protrusion 59.

(4) The inner circumferential portion 55 of the second tubular member 50A is formed with a supply annular groove 60 corresponding to the supply annular groove 13, an intermediate annular groove 62 corresponding to the intermediate annular groove 15, and The annular groove 61 is discharged corresponding to the discharge annular groove 14.

(5) The inner peripheral portion 55 of the second tubular member 50A is formed with a supply communication groove 63 corresponding to the supply communication groove 19, an intermediate communication groove 64 corresponding to the intermediate communication groove 20, and a discharge communication groove. 21 corresponds to a discharge communication groove (not shown).

(6) The inner peripheral portion 55 of the second tubular member 50A is formed with a first seal groove 56a corresponding to the first seal groove 17a and a second seal groove 56b corresponding to the second seal groove 17b. The sealing member 18 is fitted in the first seal groove 56a and the second seal groove 56b.

That is, in the present embodiment, the points at which the annular grooves and the communication grooves are formed in the second tubular member 50A are different from those in the first embodiment. Others are the same as in the first embodiment.

The front end of each of the first protrusion 57, the second protrusion 58, and the third protrusion 59 in the circumferential direction D2 of the first tubular member 10G and the outer peripheral portion 12 of the first cylindrical member 10G are provided and implemented. The gap δ of the form 1 has the same gap δ 1 .

The refrigerant flow path 2A is provided with a flow path through which the refrigerant flows between the first cylindrical member 10G and the second cylindrical member 50A, and is supplied to the annular groove 60, the intermediate annular groove 62, and the discharge annular groove 61, The communication groove 63, the intermediate communication groove 64, and the discharge communication groove are provided.

In the rotary electric machine 100-2 of the second embodiment, at least two communication grooves are formed between the first tubular member 10G and the second tubular member 50A on the upstream side and the downstream side, because the communication grooves are Since the positions of the circumferential direction D2 are deviated from each other, the cooling efficiency can be improved similarly to the first embodiment.

 Embodiment 3  

Figure 13 is a cross-sectional view showing a rotary electric machine according to a third embodiment of the present invention. Fig. 14 is a perspective view of the stator core shown in Fig. 13. The difference between the rotary electric machine 100-1 of the first embodiment and the rotary electric machine 100-3 of the third embodiment is as follows.

(1) The second cylindrical member 50 is not used in the rotary electric machine 100-3, and the rotary electric machine 100-3 is provided with the stator 30A instead of the stator 30.

(2) The stator 30A includes a stator core 31A instead of the stator core 31, and a first cylindrical member 10H in place of the first cylindrical member 10.

(3) The first cylindrical member 10H is not formed with the first protrusion 22, the second protrusion 23, the third protrusion 24, the supply annular groove 13, the intermediate annular groove 15, and the discharge annular groove 14, but is formed with The refrigerant supply port (23) corresponding to the refrigerant supply port 51 and the refrigerant discharge port (27) corresponding to the refrigerant discharge port (52).

That is, in the present embodiment, a refrigerant flow path is formed between the stator 30A and the first cylindrical member 10H. Other than this, it is the same as that of the first embodiment or the second embodiment.

The stator core 31A is composed of a first core block 31A1 in which a plurality of annular thin plates are laminated, and a second plate having a smaller diameter than a thin plate constituting the first core block 31A1. The core block 31A2 and the laminated plurality of sheets are formed in the third core portion 31A3 formed of a thin plate on the outer peripheral surface at equal intervals in the circumferential direction D2. The first core block 31A1 is disposed on both sides of the stator core 31A in the axial direction D1, that is, on the most upstream side and the most downstream side, and the second core block 31A2 is disposed adjacent to the first core block 31A1, and The second core block 31A2 and the third core block 31A3 are alternately arranged in the axial direction D1.

As shown in Fig. 14, in the present embodiment, the annular groove is formed by the second core block 31A2, and the communication groove is formed by the notch of the third core block 31A3.

The outer peripheral portion 35 of the stator core 31A is formed with a first protrusion 65 corresponding to the first protrusion 22, a second protrusion 66 corresponding to the second protrusion 23, and a third protrusion 67 corresponding to the third protrusion 24. . The outer peripheral portion 35 of the stator core 31A is formed with a supply annular groove 68 corresponding to the supply annular groove 13, an intermediate annular groove 70 corresponding to the intermediate annular groove 15, and corresponding to the discharge annular groove 14. The annular groove 69 is discharged.

As shown in Fig. 14, the outer peripheral portion 35 of the stator core 31A is formed with a supply communication groove 71 corresponding to the supply communication groove 19, an intermediate communication groove 72 corresponding to the intermediate communication groove 20, and a discharge communication groove. 21 corresponds to the discharge communication groove 73. The supply annular groove 68 is formed near one end surface 31a of the stator core 31A, and the discharge annular groove 69 is formed near the other end surface 31b of the stator core 31A, and the intermediate annular groove 70 is formed at the supply. Between the annular groove 68 and the discharge annular groove 69.

A gap δ 2 is provided between the inner peripheral portion 11 of the first tubular member 10H and the outer peripheral portion of the third core block 31A3. The size of the gap δ 2 is the same as the gap δ of the first embodiment. The refrigerant flow path 2B is a flow path through which the refrigerant flows between the first tubular member 10H and the stator core 31A, and is supplied with the annular groove 68, the intermediate annular groove 70, the discharge annular groove 69, and the supply communication groove 71. The intermediate communication groove 72, the discharge communication groove 73, and the gap δ 2 are formed.

In the rotary electric machine 100-3 of the third embodiment, between the first tubular member 10H and the stator core 31A, at least two communication grooves are formed on the upstream side and the downstream side, and the circumferential direction of the communication grooves is formed. Since the positions of D2 are deviated from each other, the cooling efficiency can be improved similarly to the first embodiment. Further, in the rotary electric machine 100-3 of the third embodiment, the second cylindrical member 50 is not required, and the manufacturing time required for mounting the second cylindrical member 50 can be shortened, and the second cylindrical member 50 can be made no. The required portion can reduce the manufacturing cost of the rotary electric machine 100-3. Further, in the third embodiment, since the refrigerant can flow through the outer circumferential surface of the stator core 31A, the amount of heat exchange can be increased as compared with the first embodiment, and the cooling efficiency can be improved.

 Embodiment 4  

Figure 15 is a cross-sectional view showing a rotary electric machine according to a fourth embodiment of the present invention. Fig. 16 is a view showing the inner peripheral portion of the first cylindrical member shown in Fig. 15. The difference between the rotary electric machine 100-1 of the first embodiment and the rotary electric machine 100-4 of the fourth embodiment is as follows.

(1) In the rotary electric machine 100-4, the second cylindrical member 50 is not used, and the rotary electric machine 100-4 is provided with the stator 30B instead of the stator 30.

(2) The stator 30B is provided with a first cylindrical member 10I in place of the first cylindrical member 10.

In other words, in the present embodiment, the configuration of the first cylindrical member 10G of the rotary electric machine of the second embodiment is omitted.

The inner peripheral portion 11 of the first cylindrical member 10I is formed with a first protrusion 74 corresponding to the first protrusion 22, a second protrusion 75 corresponding to the second protrusion 23, and a third protrusion 24 corresponding thereto. The third projection 76, the supply annular groove 77 corresponding to the supply annular groove 13, the intermediate annular groove 79 corresponding to the intermediate annular groove 15, and the discharge annular groove 78 corresponding to the discharge annular groove 14 .

The inner peripheral portion 11 of the first tubular member 10I is formed with a supply communication groove 80 corresponding to the supply communication groove 19, an intermediate communication groove 81 corresponding to the intermediate communication groove 20, and a discharge communication groove 21 Corresponding discharge communication grooves 82 are provided. The first cylindrical member 10I is formed with a refrigerant supply port 28 corresponding to the refrigerant supply port 51 and a refrigerant discharge port 29 corresponding to the refrigerant discharge port 52.

A gap δ 3 is provided between the tip end of each of the first protrusion 74, the second protrusion 75, and the third protrusion 76 in the radial direction of the first tubular member 10I and the outer peripheral portion of the stator core 31. The size of the gap δ 3 is the same as the gap δ of the first embodiment. The refrigerant flow path 2C is a flow path through which the refrigerant flows between the first tubular member 10I and the stator core 31, and is supplied with the annular groove 77, the intermediate annular groove 79, the discharge annular groove 78, and the supply communication groove 80. The intermediate communication groove 81 and the discharge communication groove 82 are configured.

In the rotary electric machine 100-4 of the fourth embodiment, between the first tubular member 10I and the stator core 31, at least two communication grooves are formed on the upstream side and the downstream side, and the communication grooves are in the circumferential direction D2. Since the positions in the middle are deviated from each other, the cooling efficiency can be improved in the same manner as in the first embodiment. Further, in the rotary electric machine 100-4 of the fourth embodiment, the second cylindrical member 50 is not required, and the manufacturing time required for mounting the second cylindrical member 50 can be shortened, and the second cylindrical member 50 can be made no. The required portion can reduce the manufacturing cost of the rotary electric machine 100-4. Further, in the fourth embodiment, since the refrigerant can be caused to flow on the outer circumferential surface of the stator core 31, the amount of heat exchange is increased as compared with the first embodiment, and the cooling efficiency can be improved.

Further, in the rotary electric machines according to the first to fourth embodiments, one refrigerant supply port and a refrigerant discharge port are provided, and a plurality of refrigerant supply ports and refrigerant discharge ports may be provided separately. According to this configuration, a plurality of refrigerant supply ports through which the refrigerant passes are connected to the supply annular groove, and a plurality of refrigerant discharge ports through which the refrigerant passes are communicated in the discharge annular groove. Therefore, compared with the case where one refrigerant supply port and the refrigerant discharge port are provided in the rotary electric machine, the pressure loss generated when the refrigerant passes through the refrigerant supply port and the refrigerant discharge port is reduced, and the flow rate of the refrigerant flowing through the rotary electric machine is increased. Increase cooling efficiency.

Further, in the rotary electric machine according to the first to fourth embodiments, at least one supply communication groove and the discharge communication groove are formed along the circumferential direction D2, but the supply communication groove and the discharge communication groove are arranged in the circumferential direction D2, respectively. In this case, the pressure loss generated when the refrigerant passes through the supply communication groove and the discharge communication groove is reduced, and the flow rate of the refrigerant flowing through the rotary electric machine is increased, and the cooling efficiency can be improved.

The configuration shown in the above embodiment is an example of the present invention, and may be combined with other conventional techniques, and the configuration may be omitted or changed without departing from the gist of the invention.

Claims (20)

 A stator of a rotating electrical machine includes: a stator core; and a refrigerant flow path provided on an outer peripheral portion of the stator core; and the refrigerant flow path has a first annular groove that faces a central axis of the stator core a second annular groove extending adjacent to the first annular groove and extending in the circumferential direction; the third annular groove is adjacent to the second annular groove and extending in the circumferential direction; a first communication groove connecting the first annular groove and the second annular groove; and a second communication groove connecting the second annular groove and the third annular groove; the first connection The positions of the through grooves and the second communication grooves in the circumferential direction are deviated from each other.    The stator of the rotary electric machine according to claim 1, wherein the refrigerant flow path is formed by the first cylindrical member and the second cylindrical member, and the first cylindrical member is provided to the stator core. The outer peripheral portion is provided on the outer peripheral portion of the first cylindrical member.    The stator of a rotating electrical machine according to claim 1, wherein the refrigerant flow path is formed by the stator core and the first cylindrical member, and the first cylindrical member is provided on an outer circumference of the stator core. unit.    The stator of the rotating electric machine according to the second or third aspect of the invention, wherein the first cylindrical member has the first annular groove, the second annular groove, and the third annular groove The first communication groove and the second communication groove.    The stator of the rotary electric machine according to claim 2, wherein the second tubular member has the first annular groove, the second annular groove, the third annular groove, and the first a communication groove and the aforementioned second communication groove.    The stator of a rotating electrical machine according to claim 3, wherein the stator core has the first annular groove, the second annular groove, the third annular groove, and the first communication groove And the aforementioned second communication groove.    The stator of the rotating electric machine according to any one of claims 1, 2, 3, 5, and 6, wherein the first communication groove is arranged in a plurality of rows in the circumferential direction.    The stator of the rotating electric machine according to claim 4, wherein the first communication groove is arranged in plural in the circumferential direction.    The stator of the rotary electric machine according to any one of claims 1, 2, 3, 5, and 6, wherein the second communication groove is arranged in a plurality of rows in the circumferential direction.    The stator of the rotating electrical machine according to claim 4, wherein the second communication groove is arranged in a plurality of rows in the circumferential direction.    The stator of a rotating electrical machine according to claim 7, wherein the second communication groove is arranged in plural in the circumferential direction.    The stator of the rotating electrical machine according to any one of the preceding claims, wherein the second annular groove has a depth d relative to the second annular groove formed The ratio of the width of the gap δ of the leading end of the protrusion is 15 to 200.    The stator of the rotating electric machine according to claim 4, wherein a ratio of a depth d of the second annular groove to a width δ of a gap δ provided at a tip end of the protrusion forming the second annular groove is 15 To 200.    The stator of the rotary electric machine according to claim 7, wherein a ratio of a depth d of the second annular groove to a width δ of a gap δ provided at a tip end of the protrusion forming the second annular groove is 15 To 200.    The stator of the rotary electric machine according to claim 9, wherein a ratio of a depth d of the second annular groove to a width δ of a gap δ provided at a tip end of the protrusion forming the second annular groove is 15 To 200.    A rotary electric machine includes: a stator of a rotating electrical machine according to any one of claims 1, 2, 3, 5, and 6; and a rotor provided inside the stator core.    A rotary electric machine comprising: a stator of a rotating electrical machine according to claim 4; and a rotor provided inside the stator core.    A rotary electric machine comprising: a stator of a rotating electrical machine according to claim 7; and a rotor provided inside the stator core.    A rotary electric machine comprising: a stator of a rotating electrical machine according to claim 9; and a rotor provided inside the stator core.    A rotary electric machine comprising: a stator of a rotating electrical machine according to claim 12; and a rotor provided inside the stator core.