WO2015056707A1

WO2015056707A1 - Rotating electrical machine

Info

Publication number: WO2015056707A1
Application number: PCT/JP2014/077425
Authority: WO
Inventors: 林　裕人; 英滋土屋; 育充長田; 亘土方; 渡辺　隆男; 遠山　智之
Original assignee: 株式会社豊田自動織機
Priority date: 2013-10-16
Filing date: 2014-10-15
Publication date: 2015-04-23
Also published as: JP2015080330A

Abstract

　A rotating electrical machine (1) is provided with a stator (10) in which a plurality of phases of stator coils (12) are wound around a cylindrical stator core (11). The rotating electrical machine (1) is also provided with lubricant supply tubes (32, 33) located above coil ends (12d, 12e) of the stator coils (12) protruding from the cylinder-axis-direction ends of the stator core (11), the lubricant supply tubes (32, 33) being provided outside of the stator core (11). The lubricant supply tubes (32, 33) have a plurality of dropping holes (32b, 32c, 33b, 33c) via which lubricant is provided in droplets to portions of the coil ends (12d, 12e) corresponding to at least the second phase coil among the plurality of phases of stator coils (12).

Description

Rotating electric machine

This invention relates to a rotating electrical machine having a coil cooling structure.

In a rotating electrical machine, a coil wound around a stator, a rotor or the like is provided with a coil cooling structure in order to generate heat when current flows and to reduce the operating efficiency of the rotating electrical machine.
For example, Patent Document 1 describes a cooling structure that directly cools a coil end of a stator coil wound around a stator core in a stator of a rotating electrical machine. Specifically, in this cooling structure, a substantially U-shaped pipe is disposed above each of the cylindrical coil ends protruding from both ends of the cylindrical stator core. And oil is dripped to each coil end from two places at the tip of each substantially U-shaped pipe, and the dropped oil flows downward along the circumference of each coil end in each coil end, In the process, the coil end, that is, the stator coil is cooled.

JP 2005-229671 A

In the stator coil cooling method described in Patent Document 1, although the cooling effect of the coil end by oil at the time of dropping to the coil end is large, the oil temperature rises in the process of flowing through the coil end. The cooling effect of oil in the end is small and cannot be expected. Further, in Patent Document 1, in order to make oil flow down along the circumference of the coil end, the angle of a line segment formed by connecting the two dripping positions of the oil to the coil end and the cylindrical shaft of the stator is predetermined. The oil dripping position on the coil end is set so as to be an angle of. For this reason, oil is dripped at the same position between the coil ends at both ends of the stator core. However, in a rotating electrical machine powered by three-phase AC power, a stator coil and a coil end are configured by three-phase coils corresponding to the U phase, the V phase, and the W phase. For this reason, oil is dripped at the coil of the same phase between the coil ends of both ends of the stator core. Furthermore, depending on the case, in each coil end, two dripping positions of oil may become a coil of the same phase. Therefore, there is a case where only one of the three-phase coils is efficiently cooled, but the remaining two-phase coils are hardly cooled. As a result, the coil end, that is, the stator coil is cooled. There is a problem that a large bias occurs.

The present invention has been made to solve such problems, and an object of the present invention is to provide a rotating electrical machine that can directly cool a plurality of coils in the rotating electrical machine with oil.

In order to solve the above problems, a rotating electrical machine according to the present invention includes a stator in which a multi-phase coil is wound around a cylindrical stator core, and the multi-phase coil extends from an end of the stator core in the cylindrical axis direction. In the rotating electrical machines each having a protruding coil end, the rotating electrical machine includes a cooling liquid supply pipe that is provided on the outer peripheral side of the stator core and is located above the coil end and supplies a cooling liquid to the coil end. Among the phase coils, at least a plurality of dropping holes for dropping the coolant on the coil ends corresponding to the two-phase coils are provided.

According to the rotating electric machine according to the present invention, it is possible to directly cool a multi-phase coil with a coolant.

1 is a perspective view of a stator of a rotating electrical machine according to an embodiment of the present invention and a structure around the stator. It is the figure which looked at the cross-sectional side view of FIG. 1 along the coil end of one oil supply pipe and a stator along the direction II. It is the figure which looked at the cross-sectional side view of FIG. 1 along the coil end of the other oil supply pipe and the stator along the direction III. FIG. 2 is a perspective view of the oil supply pipe assembly of FIG. 1. It is the bottom view which looked at the oil supply pipe assembly of FIG. 4 from the downward direction which is a dripping hole side. It is a cross-sectional side view which shows the coil end of the stator at the time of using a distributed winding type stator coil similarly to FIG. It is a cross-sectional side view which shows the coil end of the stator at the time of using a distributed winding type stator coil similarly to FIG. It is a bottom view which shows the modification of the oil supply pipe in an oil supply pipe assembly similarly to FIG. It is a bottom view which shows another modification of the oil supply pipe | tube in an oil supply pipe | tube assembly similarly to FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
First, the structure of the stator 10 and its periphery in the rotary electric machine 1 which concerns on embodiment of this invention is demonstrated. In the present embodiment, three-phase AC power is applied to the stator 10 of the rotating electrical machine 1, and the stator 10 is a concentrated winding type constituted by coils corresponding to the three phases of the three-phase AC power. The description will be made assuming that the stator coil is wound.

Referring to FIG. 1, the rotating electrical machine 1 includes a cylindrical stator 10 and a motor housing 2 that houses therein a rotor (not shown) disposed inside the stator 10.
Although details will be described later, the stator 10 includes a stator core 11 made of a magnetic material such as a cylindrical metal, and a stator coil 12 formed by winding a winding around the stator core 11.
The motor housing 2 includes a substantially cylindrical motor chamber 21, a rectangular parallelepiped cooling chamber 22 above the motor chamber 21, and an oil sump chamber 23 below the motor chamber 21. The rotating electrical machine 1 is installed with the oil sump chamber 23 facing downward.
The cooling chamber 22 communicates with the motor chamber 21 in the entire lower portion thereof. The oil sump chamber 23 is partitioned from the motor chamber 21 by a partially cylindrical partition wall 2 a integrated with the motor housing 2. The motor chamber 21 communicates with the oil sump chamber 23 through a communication hole 2ac formed in the bottom of the recessed portion 2ab that is recessed downward in the partition wall 2a.

In FIG. 1, in the motor housing 2, the upper part of the cooling chamber 22 is opened, and one side of the motor chamber 21, the cooling chamber 22, and the oil sump chamber 23 is opened. In the rotating electrical machine 1 as a product, the open upper portion of the cooling chamber 22 is closed by a ceiling plate (not shown), and the opened side portions of the motor chamber 21, the cooling chamber 22 and the oil sump chamber 23 are end plates (not shown). It is comprised so that it may be plugged up by.

In the substantially cylindrical peripheral wall 2 b of the motor housing 2, the inner peripheral surface of the wall portion 2 b 1 forming the motor chamber 21 has a shape along the outer peripheral surface 11 a of the cylindrical stator core 11. The stator 10 is disposed in the motor chamber 21 so that the outer peripheral surface 11a of the stator core 11 is supported by the peripheral wall 2b in the radial direction perpendicular to the cylindrical axis. Further, as shown in FIG. 2, the stator core 11 is integrally formed with a plurality of fixing ribs 11 c protruding from the outer peripheral surface 11 a. Each of the fixing ribs 11c is screwed and fixed to an end wall 2c that closes a side end portion of the peripheral wall 2b in the motor housing 2. As described above, the stator core 11 is fixed to the motor housing 2. A cylindrical rotor (not shown) that rotates integrally with the rotating shaft of the rotating electrical machine 1 is arranged inside the stator core 11 fixed to the motor housing 2. And the rotating shaft of a rotor and the cylindrical axis | shaft of the stator core 11 are located on coaxial.

1 to 3 together, the stator core 11 of the stator 10 is integrally formed with a plurality of teeth 11b protruding inward in the radial direction. Each tooth 11b has a belt-like main body portion 11b1 extending along the cylindrical axis direction of the stator core 11 and a tip portion 11b2 extending radially inward from the main body portion 11b1 in a T shape. . Further, the plurality of teeth 11 b are arranged at equal intervals along the circumferential direction of the stator core 11 at intervals. Thereby, between the main body parts 11b1 of the teeth 11b, slots opened on both sides in the axial direction and radially inward are formed.

A winding 13 constituting the stator coil 12 is wound around the main body 11b1 of each tooth 11b, and the winding 13 is accommodated in the slot. The winding 13 is configured so that three-phase AC power is applied. And the coil | winding 13 is the 1st coil part 12a connected to the U phase of a three-phase alternating current power supply, the 2nd coil part 12b connected to a V phase, and the 3rd coil part 12c connected to a W phase. Is forming. The first coil portion 12a, the second coil portion 12b, and the third coil portion 12c are wound around mutually different teeth 11b, and the first coil portion 12a, the second coil portion 12b, and the third coil are wound along the circumferential direction of the stator core 11. It arrange | positions at the teeth 11b so that the order made into the coil part 12c and the 1st coil part 12a .... may be repeated. Furthermore, the first coil portions 12a wound around the plurality of teeth 11b are connected to each other by windings. Similarly, the second coil portions 12b wound around the plurality of teeth 11b are also connected to each other by windings. The third coil portions 12c wound around the plurality of teeth 11b are also connected to each other by windings.
Therefore, the stator coil 12 including the first coil portion 12a, the second coil portion 12b, and the third coil portion 12c is a concentrated winding type coil in which the winding 13 is intensively wound around one tooth 11b. Forming.

The first coil portion 12a, the second coil portion 12b, and the third coil portion 12c protrude from the both end portions of the stator core 11 in the cylindrical axis direction, and the portions 12aa and 12ab from which the first coil portion 12a protrudes, the second coil, respectively. The protruding portions 12ba and 12bb of the portion 12b and the protruding portions 12ca and 12cb of the third coil portion 12c form coil ends 12d and 12e of the stator coil 12, respectively. Here, the coil end 12d constitutes a first coil end protruding from one end of the stator core 11 in the cylindrical axis direction, and the coil end 12e is a first end protruding from the other end of the stator core 11 in the cylindrical axis direction. Constructs a two-coil end.

Referring to FIG. 1, in the substantially cylindrical peripheral wall 2 b in the motor housing 2, oil as a coolant is supplied to the coil ends 12 d and 12 e of the stator coil 12 in the wall portion 2 b 2 forming the cooling chamber 22. The oil supply pipe assembly 30 is attached.
4 and 5 together, the oil supply pipe assembly 30 includes a manifold 31 and

oil supply pipes

32 and 33 having the same shape and connected to the manifold 31.
The manifold 31 has a hollow structure with a substantially T-shaped outer shape. The manifold 31 has an oil receiving port 31a that opens substantially at the center, and

insertion ports

31b and 31c that open to opposite sides of the oil receiving port 31a at both ends. The oil receiving port 31 a communicates with the

insertion ports

31 b and 31 c through the inside of the manifold 31.
Here, the oil supply pipe assembly 30 constitutes a coolant supply pipe assembly. The

oil supply pipes

32 and 33 constitute a coolant supply pipe. More specifically, the oil supply pipe 32 constitutes a first coolant supply pipe, and the oil supply pipe 33 constitutes a second coolant supply pipe. To do. The oil receiving port 31a constitutes a coolant receiving port.

Each of the

oil supply pipes

32 and 33 is closed at one end by

plugs

32 a and 33 a, and the other open end is press-fitted into the

insertion ports

31 b and 31 c of the manifold 31 and assembled to the manifold 31. ing. The

oil supply pipes

32 and 33 assembled to the manifold 31 extend in parallel and in the same direction, and the insides of the

oil supply pipes

32 and 33 communicate with the oil receiving port 31a.
The manifold 31 to which the

oil supply pipes

32 and 33 are assembled forms an oil supply pipe assembly 30 that is one assembly together with the

oil supply pipes

32 and 33.
In addition, two

drop holes

32b and 32c and two

drop holes

33b and 33c are formed through the cylindrical peripheral walls of the

oil supply pipes

32 and 33, respectively. Here, the dropping

holes

32b and 32c constitute a plurality of first dropping holes, and the dropping

holes

33b and 33c constitute a plurality of second dropping holes.
The dropping holes 32b and 32c and the dropping

holes

33b and 33c open in the same direction perpendicular to the direction in which the

oil supply pipes

32 and 33 are arranged in parallel.
Further, the drip holes 32b and 32c are arranged on the center side of the

oil supply pipes

32 and 33 with respect to the drip holes 33b and 33c. That is, the interval between the dropping

holes

32b and 32c is narrower than the interval between the dropping

holes

33b and 33c.

Referring to FIGS. 1 to 5 together, the oil supply pipe assembly 30 includes

oil supply pipes

32 and 33 from the outside to through holes 2b2a and 2b2b formed in the wall portion 2b2 of the peripheral wall 2b of the motor housing 2, respectively. It is inserted and attached to the motor housing 2. Further, the inserted

oil supply pipes

32 and 33 are respectively inserted into through holes 2b3a and 2b3b formed in the wall 2b3 which forms the cooling chamber 22 in the peripheral wall 2b and faces the wall 2b2, thereby Supported by 2b2 and 2b3. The manifold 31 is fixed to the wall 2b2 with screws.

1 to 3 together, in the oil supply pipe assembly 30 attached and fixed to the motor housing 2 as described above, the oil supply pipe 32 is connected to the stator coil 12 on the outer peripheral surface 11a side of the stator core 11. It is located above the coil end 12 d and extends along a direction substantially perpendicular to the cylindrical axis of the stator core 11. Further, the dropping

holes

32b and 32c of the oil supply pipe 32 open downward toward the coil end 12d, and are located at equal distances upward from the coil end 12d. That is, the drip hole 32b is located directly above the protruding portion 12aa from the stator core 11 in the first coil portion 12a, and the dripping hole 32c is located directly above the protruding portion 12ba from the stator core 11 in the second coil portion 12b. To do.

Further, the oil supply pipe 33 of the oil supply pipe assembly 30 attached and fixed to the motor housing 2 is located on the outer peripheral surface 11a side of the stator core 11 away from the coil end 12e of the stator coil 12, and is positioned above the stator core 11. It extends along a direction substantially perpendicular to the cylindrical axis. Further, the dropping

holes

33b and 33c of the oil supply pipe 33 are opened downward toward the coil end 12e, and are located at equal distances upward from the coil end 12e. That is, the drip holes 33b and 33c are located directly above the different projecting portions 12cb from the stator core 11 in the third coil portion 12c.

In addition, a plurality of air holes 2 ca penetrating through the wall portion are formed in the wall portion of the end wall 2 c of the motor housing 2 that forms the cooling chamber 22. Further, a plurality of air holes penetrating the wall portion are formed in the wall portion forming the cooling chamber 22 in the end plate (not shown) facing the end wall 2c. Therefore, outside air is introduced into the cooling chamber 22 from the air hole 2ca, and the introduced outside air cools the stator 10 and is discharged from the air hole of the end plate.

Referring to FIG. 1, an oil discharge pipe 41 is connected to the lower part of the end wall 2 c of the motor housing 2. The oil discharge pipe 41 is connected to an oil pan 40 located below the rotating electrical machine 1, and communicates the oil sump chamber 23 of the motor housing 2 with the oil pan 40. The oil pan 40 is used for storing lubricating oil, hydraulic oil, or the like in a device in which the rotating electrical machine 1 is mounted. For example, when the rotating electrical machine 1 is mounted in an automobile, a gear box of an automatic transmission is used. Is done.
An oil feed pipe 42 extends from the oil pan 40 and is connected to the oil receiving port 31 a of the oil supply pipe assembly 30. That is, the oil supply pipe 42 communicates the inside of the oil pan 40 with the inside of the manifold 31 of the oil supply pipe assembly 30. Further, an oil pump 43 that pumps oil in the oil pan 40 into the manifold 31 is provided in the middle of the oil feed pipe 42.

Next, the operation of the stator 10 and its surroundings in the rotating electrical machine 1 according to the embodiment of the present invention will be described.
Referring also to FIGS. 1 to 3, in the rotating electrical machine 1, when three-phase AC power is applied to the stator coil 12 of the stator 10, the

coil portions

12a, 12b of each phase of the U phase, the V phase, and the W phase. And 12c generate rotating magnetic fields that are out of phase with each other. As a result, a rotor (not shown) inside the stator 10 is driven to rotate together with the rotating shaft around the rotating shaft coaxial with the stator core 11.

At this time, since the

coil portions

12a, 12b and 12c of each phase generate heat, the oil pump 43 is driven to supply the oil in the oil pan 40 to the oil supply pipe assembly 30, and the supplied oil is supplied to the oil supply pipe. Drops are dropped onto the coil ends 12 d and 12 e of the stator coil 12 from the dropping holes 32 b, 32 c, 33 b and 33 c of 32 and 33.
The oil from the dropping

holes

32b and 32c respectively drops to the part 12aa of the first coil part 12a and the part 12ba of the second coil part 12b in the coil end 12d, and the oil from the dropping

holes

33b and 33c is supplied to the coil end 12e. It dripped at the site | part 12cb of the two 3rd coil parts 12c. Therefore, the U-phase, V-phase, and W-phase coil end portions are directly cooled by the oil. That is, the plurality of dropping

holes

32b, 32c, 33b and 33c are coil end portions corresponding to all the

coil portions

12a, 12b and 12c among the U-phase, V-phase and W-

phase coil portions

12a, 12b and 12c. It is arrange | positioned so that oil can be dripped in.

Furthermore, the other first coil part 12a connected to the first coil part 12a, the second coil part 12b, and the third coil part 12c to which oil directly drops is wound and wound around another tooth 11b. The second coil portion 12b and the third coil portion 12c are also cooled by cold heat conduction from the coil portion that is directly cooled by oil.
Moreover, the oil which cooled each of the 1st coil part 12a, the 2nd coil part 12b, and the 3rd coil part 12c directly cools an adjacent coil part, when flowing down.
Therefore, the bias of the cooling effect in the entire first coil portion 12a, second coil portion 12b, and third coil portion 12c that are directly cooled by oil is reduced.

As described above, the rotating electrical machine 1 according to the embodiment of the present invention includes the stator 10 in which the multi-phase stator coil 12 is wound around the cylindrical stator core 11.

Coil portions

12a, 12b, and 12c corresponding to each phase of the multi-phase stator coil 12 are portions 12aa, 12ab, 12ba, and 12bb constituting coil ends 12d and 12e protruding from the end portions of the stator core 11 in the cylindrical axis direction, respectively. , 12ca, 12cb. The rotating electrical machine 1 includes

oil supply pipes

32 and 33 that are provided on the outer peripheral side of the stator core 11 and located above the coil ends 12d and 12e of the stator coil 12, and the

oil supply pipes

32 and 33 are coil ends. It is comprised so that oil may be supplied to 12d and 12e. The

oil supply pipes

32 and 33 include a plurality of oil drops that are dropped onto the portions 12aa to 12ca and 12ab to 12cb of the coil ends 12d and 12e corresponding to at least the two-phase coil portions 12a to 12c of the plurality of stator coils 12. It has

drip holes

32b, 32c, 33b, 33c.

At this time, the oil from the dropping

holes

32b, 32c, 33b, 33c of the

oil supply pipes

32, 33 is dropped on the coil ends of the coil portions of the plurality of phases constituting the stator coil 12 to directly cool them. And since the coil part to which oil drops directly is cooled effectively, the other coil part which is in phase with this coil part and is connected via the winding is also cooled. Furthermore, the coil part adjacent to the coil part to which oil directly drops is cooled by the oil after direct cooling. Therefore, it is possible to reduce the variation in the cooling effect in the coil portions of each phase.

Further, in the rotary electric machine 1, the

oil supply pipes

32 and 33 are disposed above the coil ends 12 d and 12 e protruding from both ends of the stator core 11 in the cylindrical axis direction and substantially perpendicular to the cylindrical axis of the stator core 11. The intervals between the dropping

holes

32b and 32c in the

oil supply pipes

32 and 33 are different from the intervals between the dropping

holes

33b and 33c. Thereby, the number of coil ends of the coil part directly cooled by oil can be increased. Furthermore, the coil part cooled between the both sides of the stator core 11 can be made different by making the space | interval of dripping

hole

32b, 32c and the space | interval of dripping

hole

33b, 33c differ, The coil part cooled directly with oil The number of phases can be increased.

In the rotating electrical machine 1, the plurality of drip holes 32 b, 32 c, 33 b, 33 c of the

oil supply pipes

32 and 33 disposed above the coil ends 12 d and 12 e at both ends of the stator core 11 are the drip holes. Are arranged so that oil can be dripped onto the portions of the coil ends 12d and 12e corresponding to the coil portions of all phases of the stator coil 12. As a result, the coil ends of the coil portions of all phases can be directly cooled with oil, and variations in the cooling effect in the coil portions of each phase can be reduced.

The rotating electrical machine 1 includes a motor housing 2 that houses the stator 10, and an oil supply pipe assembly 30 that is separate from the motor housing 2 and attached to the motor housing 2. Further, the oil supply pipe assembly 30 includes

oil supply pipes

32 and 33 and a manifold 31. The manifold 31 has an oil receiving port 31a and distributes oil received from the oil receiving port 31a to the

oil supply pipes

32 and 33, respectively. At this time, it is necessary to change the dropping position and the dropping flow rate of the oil to the coil ends 12d and 12e according to the configuration of the stator coil 12 of the stator 10 such that the stator coil is a concentrated winding type or a distributed winding type. However, only by changing the structure of the oil supply pipe assembly 30, for example, the position and size of the drip hole, it is possible to cope with the change without changing the motor housing 2. Furthermore, it is possible to cope only by changing the structure of the

oil supply pipes

32 and 33 of the oil supply pipe assembly 30.

Further, in the rotary electric machine 1, the manifold 31 of the oil supply pipe assembly 30 has a flow rate of oil distributed to the

oil supply pipes

32 and 33, based on the distance relationship between the oil receiving inlet 31 a and the

oil supply pipes

32 and 33. The configuration can be changed. If the pressure loss increases as the distance between the oil receiving port 31a and the oil supply pipe increases, the flow rate of the oil flowing through the oil supply pipe decreases. Then, if it is necessary to differentiate the amount of oil dropped for direct cooling at the coil ends 12d and 12e at both ends of the stator core 11, the position of the oil receiving port 31a may be changed.

In the rotating electrical machine 1 according to the embodiment, the concentrated winding type stator coil 12 is wound around the stator core 11 of the stator 10, but the present invention is not limited to this. As shown in FIGS. 6 and 7, in the stator 210, a distributed winding type stator coil 212 may be wound around the stator core 211.
The stator core 211 is integrally formed with a plurality of teeth 211b projecting radially inward. Each tooth 211b has a trapezoidal radial cross section and extends along the cylindrical axis direction of the cylindrical stator core 211. Further, the plurality of teeth 211b are arranged side by side along the inner circumferential direction of the stator core 211, and a narrow groove is formed between them.

The first coil portion 212a, the second coil portion 212b, and the second coil portion 212b that constitute the stator coil 212 so as to pass through the narrow groove and straddle the plurality of teeth 211b (four teeth 211b in FIGS. 6 and 7). The third coil part 212c is wound. The first coil part 212a, the second coil part 212b, and the third coil part 212c are positioned so as to wrap in the circumferential direction at the end of the stator core 211, and the first coil part 212a, The second coil part 212b, the third coil part 212c, the first coil part 212a,... Furthermore, the first coil portions 212a wound between the plurality of teeth 211b, the second coil portions 212b, and the third coil portions 212c are formed by continuous windings.
Therefore, the stator coil 212 including the first coil portion 212a, the second coil portion 212b, and the third coil portion 212c forms a distributed winding type coil in which the winding is wound across the plurality of teeth 211b. .

With respect to the stator coil 212 described above, the oil supply pipe 32 of the oil supply pipe assembly 30 is located above and away from the coil end 212d of the stator coil 212 and extends in a direction substantially perpendicular to the cylindrical axis of the stator core 211. Extend. The dropping hole 32b is located right above the protruding portion 212aa of the first coil portion 212a, and the dropping hole 32c is located right above the protruding portion 212ba of the second coil portion 212b. The oil supply pipe 33 is located above and away from the coil end 212 e of the stator coil 212, and extends along a direction substantially perpendicular to the cylindrical axis of the stator core 211. Furthermore, the dropping

holes

33b and 33c are located directly above the protruding portion 212cb of the different third coil portion 212c.
Therefore, the oil dripped from the four places of the

oil supply pipes

32 and 33 falls directly on the coil ends of the first coil part 212a, the second coil part 212b, and the third coil part 212c, and can cool them.

In the rotating electrical machine 1 of the embodiment, one end of the

oil supply pipes

32 and 33 of the oil supply pipe assembly 30 is closed with the

plugs

32a and 33a, and the dripping

holes

32b, 32c, 33b, and 33c are The

oil supply pipes

32 and 33 are formed through the peripheral walls, but the present invention is not limited to this.
As shown in FIG. 8, one end of the

oil supply pipes

32 and 33 may be crushed together, and the one end of the

oil supply pipes

32 and 33 may be closed by welding the crushed portions. Thereby, since the number of parts decreases, cost reduction becomes possible.
Alternatively, as shown in FIG. 9, one end of each of the

oil supply pipes

32 and 33 is not closed, and

drip holes

32 b and 33 b are formed, and

drip holes

32 c and 33 c are respectively formed on the peripheral walls of the

oil supply pipes

32 and 33. It is also possible to form only. Further, by making the lengths of the

oil supply pipes

32 and 33 different from each other, the oil dropping positions from the dropping

holes

32b and 33b can be made different between the coil ends 12d and 12e. And by employ | adopting the above-mentioned structure, since a number of parts reduces and a processing man-hour also reduces, cost reduction becomes possible.

In the rotary electric machine 1 according to the embodiment, the two

oil supply pipes

32 and 33 of the oil supply pipe assembly 30 are each formed with two dripping holes. However, the present invention is not limited to this. At least one of the

oil supply pipes

32 and 33 may have three or more drip holes. For example, when three dropping holes are formed in each of the

oil supply pipes

32 and 33, the three dropping holes are arranged so that oil can be dropped onto the coil ends of the U-phase, V-phase, and W-phase coil portions. May be.
Alternatively, at least one of the

oil supply pipes

32 and 33 may have less than two drip holes. At this time, for example, when one drip hole is formed in each of the

oil supply pipes

32 and 33, the drip hole is formed in the coil ends of the coil portions of two different phases of the U phase, the V phase, and the W phase. What is necessary is just to arrange | position so that can be dripped.

In the rotary electric machine 1 according to the embodiment, the

oil supply pipes

32 and 33 of the oil supply pipe assembly 30 are each provided with the same number of drip holes. A drip hole may be formed. For example, two dripping holes may be formed in one of the

oil supply pipes

32 and 33, and one dripping hole may be formed in the other. At this time, the three dripping holes by the

oil supply pipes

32 and 33 are arranged so that oil can be dripped onto the coil ends of the U-phase, V-phase and W-phase coil sections, so that the coil ends of all phases are Cooled directly by oil.

Further, in the oil supply pipe assembly 30 of the rotary electric machine 1 according to the embodiment, the oil receiving inlet 31a of the manifold 31 is disposed at a substantially equidistant position from the

insertion ports

31b and 31c of the

oil supply pipes

32 and 33, respectively. However, it is not limited to this. The oil receiving port 31a may be arranged at a position biased to either the

insertion port

31b or 31c. For example, when the oil receiving port 31a is disposed so as to be closer to the insertion port 31b, the manifold 31 is connected to the insertion port 31b than the distribution flow rate to the oil supply pipe 33 connected to the insertion port 31c. The distribution flow rate to the oil supply pipe 32 is increased.

Moreover, in the rotary electric machine 1 of embodiment, although the coil ends 12d and 12e of the stator coil 12 were cooled with oil, it is not limited to this, A cooling fluid can be dripped at the coil ends 12d and 12e. Any liquid can be used.
Moreover, although the rotary electric machine 1 of embodiment was demonstrated as a structure by which one rotor is arrange | positioned inside the stator 10, it is not limited to this, It becomes double inside the stator 10. Alternatively, a double rotor type configuration in which two rotors are disposed may be used. Alternatively, the rotating electrical machine may be configured such that a rotatable rotor is provided outside the stator. That is, the rotating electrical machine may be configured to cool directly by dropping a coolant such as oil on the coil end of the stator.

Claims

A stator having a plurality of coils wound around a cylindrical stator core,
In the rotating electric machine, each of the plurality of phase coils has a coil end protruding from an end portion of the stator core in the cylindrical axis direction.
A cooling liquid supply pipe that is provided on the outer peripheral side of the stator core and is located above the coil end and supplies a cooling liquid to the coil end;
The coolant supply pipe is
A rotating electrical machine having a plurality of dropping holes for dropping the cooling liquid to the coil ends corresponding to at least two-phase coils among the plurality of phases of coils.
The coil end is
A first coil end protruding from one end of the stator core in the cylindrical axis direction;
A second coil end protruding from the other end of the stator core in the cylindrical axial direction,
The coolant supply pipe is
A first coolant supply pipe disposed above the first coil end;
A second coolant supply pipe disposed above the second coil end,
The first coolant supply pipe and the second coolant supply pipe extend in a direction substantially perpendicular to a cylindrical axis of the stator core;
The plurality of dripping holes are
A plurality of first dropping holes of the first coolant supply pipe;
A plurality of second drip holes that the second coolant supply pipe has,
The rotating electrical machine according to claim 1, wherein an interval between the plurality of first dropping holes and an interval between the plurality of second dropping holes are different from each other.
The plurality of first dropping holes and the plurality of second dropping holes are arranged so that the cooling liquid can be dropped onto the coil ends corresponding to all phase coils of the plurality of phase coils. Item 3. The rotating electrical machine according to Item 2.
A housing for housing the stator;
A coolant supply pipe assembly that is separate from the casing and attached to the casing;
The coolant supply pipe assembly includes:
The first coolant supply pipe and the second coolant supply pipe;
4. The apparatus according to claim 2, further comprising a manifold that has a coolant inlet and distributes the coolant received from the coolant inlet to the first coolant supply pipe and the second coolant supply pipe. Rotating electric machine.
The manifold is connected to each of the first coolant supply pipe and the second coolant supply pipe based on a distance relationship between the coolant inlet and the first coolant supply pipe and the second coolant supply pipe. The rotating electrical machine according to claim 4, wherein the flow rate of the coolant to be distributed is changeable.