JP2003009437A - Cooling structure of rotary electric machine and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damage to an insulating coating and breaking of wires, etc., of a stator coil caused by a mold when a resin is molded. SOLUTION: A slot 25 of a stator core 20 accommodates a coil 30. An opening 27 of the slot 25 opening on the inner circumferential face of a stator is blocked up. A path 29 for a cooling medium is formed in the slot. A protecting cylinder 15 comprising a nonmagnetic material having a larger diameter than the inner circumferential face of the stator is coupled to an end face of the stator. A resin inner layer 16 integrated into the protecting cylinder by molding from the resin is formed inside the protecting cylinder 15. Annular spaces 10, 11 for guiding the cooling medium passing the path 29 are segmented and formed between a case 1 and the protecting cylinder 15. When the resin inner layer 16 is injection-molded, the protecting cylinder 15 serves as an outer mold. The protecting cylinder 15 eliminates the need for extracting the mold after injection-molding and prevents contacting of the mold to the coil 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for a rotating electric machine and a manufacturing method thereof.

[0002]

2. Description of the Related Art In a rotary electric machine (motor or generator, or motor / generator), in order to cool a stator efficiently, the inside of a slot (a groove portion in which a stator coil is housed) of the stator is used as a refrigerant passage. Japanese Patent Application Laid-Open No. Hei 4 (1999) -2004 discloses a structure in which a coolant (for example, cooling oil) is flowed to directly cool a stator coil or a stator, which is a heat generating portion.
It is proposed in Japanese Patent Publication No. -364343.

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

[0004]

By the way, in this case, since a coil is wound around the stator core, the inserted mold is removed after the engineered plastic material is injected and filled. There is a possibility that the coil may come into contact with the coil when it is pulled out and damage the insulating coating of the winding, and there is a problem in maintaining the quality of the coil and eventually of the rotating electric machine.

The present invention aims to solve such problems.

[0006]

According to a first aspect of the present invention, a stator core is housed in the inner periphery of a case, the opening of the slot of the stator wound with the coil to the inner peripheral surface of the stator is closed, and refrigerant is introduced into the slot. In a rotary electric machine in which a refrigerant passage is formed to be guided, a protection cylinder portion made of a non-magnetic material having a diameter larger than that of the stator inner peripheral surface is coupled to the end surface of the stator, and the protection cylinder portion is molded inside the protection cylinder portion by resin molding. The cooling structure is characterized in that an inner resin layer is formed so as to be integrated with the inner wall of the case, and an annular space communicating with the refrigerant passage is defined inside the case by a partition member composed of the protective cylinder portion and the inner resin layer.

In a second aspect based on the first aspect, a concavo-convex portion is formed on the inner peripheral surface of the protective cylinder portion.

According to a third aspect of the present invention, in the first or second aspect of the present invention, a fitting portion for fitting the end portion of the protective cylinder portion to the end plate of the stator is formed.

According to a fourth aspect of the present invention, in the first or second aspect of the present invention, there is provided a fitting portion for fitting an end portion of the protective cylinder portion to an end surface of an under plate arranged in an opening portion of an inner peripheral surface of the stator. Form.

According to a fifth aspect of the present invention, in the first or second aspect of the present invention, the end portion of the protective cylinder portion is fitted to the end plate of the stator, and the end portion of the under plate disposed on the inner peripheral surface of the stator. A fitting part is also formed that fits together.

In a sixth aspect based on the fifth aspect, both the end plate and the under plate are made of a non-magnetic material having good adhesiveness to the resin inner layer.

According to a seventh aspect of the present invention, a stator core is housed in the inner circumference of the case, and the opening of the slot of the stator around which the coil is wound to the inner circumferential surface of the stator is closed to form a refrigerant passage inside the slot. In a cooling structure of a rotating electric machine, wherein an annular space communicating with a passage and in which a refrigerant is guided is formed at an end portion of a stator, a protection cylinder portion made of a non-magnetic material having a diameter larger than that of an inner peripheral surface of the stator is coupled to the end surface of the stator. , A mold is disposed so as to have a predetermined gap with the inner circumference of the protective cylinder and penetrates the inner circumference of the stator, and the annular space between the protective cylinder and the mold is filled with a resin material. A mold is removed to form a resin inner layer, and a partition member including a protective cylinder portion and a resin inner layer,
A manufacturing method, characterized in that the annular space is formed between the inner circumference and the inner circumference of the case.

[0013]

In the first or seventh aspect of the invention, the resin inner layer is integrally resin-molded inside the protective cylinder of the non-magnetic material. The inner layer cylinder is formed by using a mold. For example, if it is formed by injection molding of resin, and there is a die on the inner circumference side of the stator at this time, the resin filling space corresponding to the inner resin layer is formed between the outer protective cylinder portion and the outer die. Is unnecessary, and as a result of the mold being unnecessary, contact with the coil of the stator, which tends to occur when the outer mold is extracted after molding, does not occur. Therefore, it is possible to reliably prevent damage to the insulating coating of the coil, disconnection, and the like.

According to the second aspect of the present invention, the unevenness on the inner circumference of the protective cylinder enhances the adhesion to the resin inner layer filled inside.

According to the third, fourth, fifth and sixth inventions,
The connection between the protective cylinder portion and the end plate or the under plate of the stator core is enhanced.

[0016]

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

1 and 2 show the entire structure of a rotating electric machine (motor or generator, or motor / generator).

In FIG. 1, a case 1 of a rotary electric machine comprises a cylindrical plate 1A and side plates 1B and 1C for closing openings at both axial ends of the cylindrical plate 1A.

A cylindrical rotor 2 is housed in the case 1. The rotor 2 has both ends of its rotating shaft 2A supported by side plates 1A and 1B via bearings 3, respectively, and is rotatable about the rotating shaft 2A.

On the inner peripheral surface of the cylindrical plate 1A, a cylindrical stator 5 is arranged so as to surround the outer periphery of the rotor 2.
A predetermined gap is provided between the inner peripheral surface of the stator 5 and the outer peripheral surface of the rotor 2.

Between the axial ends of the stator 5 and the inside of the case 1, there is a cooling jacket 10 formed of an annular space.
11 is formed. The cooling jacket 10 has a cylindrical plate 1A.
Cooling oil is supplied through an oil supply port 16 penetrating through. This cooling oil flows through the refrigerant passage 29 (see FIG. 2) formed in the stator 5 and is guided to the cooling jacket 11 on the opposite side. This cooling oil is discharged to the outside from an oil discharge port 17 formed in the cooling jacket 11 and penetrating the cylindrical plate 1A.

As shown in FIG. 2, the stator 5 comprises a stator core 20 and a coil 30 wound around the stator core 20.

The starter core 20 is constructed by connecting a predetermined number (12 in this embodiment) of split cores 21 in an annular shape (split core structure). Each split core 21 is formed by laminating a predetermined number of substantially T-shaped electromagnetic steel plates in the direction of the rotation axis 2A of the rotor 2 (direction perpendicular to the paper surface of FIG. 2).

The stator core 20 (split core 21) includes a ring-shaped back core portion 22 along the inner peripheral surface of the cylindrical plate 1A of the case 1, and the stator core 20 from the back core portion 22.
And a tooth portion 23 protruding in the radial direction on the inner peripheral side (see FIG. 3).

The recesses (grooves) between the adjacent tooth portions 23 become slots 25, and the coil 30 is concentratedly wound around each tooth portion 23 so that it is accommodated inside the slots 25.

This slot 25 is used for the cooling jacket 1
The opening 27 facing the outer periphery of the rotor 2 of the slot 25 is used as a refrigerant passage 29 for passing the cooling oil from 0.
The under plate 40 is attached to the
reference). In addition, the under plate 40 is the teeth portion 23.
Axially extending ridges 2 provided on both sides near the tip of the
Inserted and held between 8A and 28B, as described below,
The outer side (rotor side) is filled with a resin material so as to be flush with the inner circumferential surface of the stator, an inner resin layer 50 is formed, and the refrigerant passage 29 is sealed.

In order to form the cooling jackets 10 and 11, a tubular partition member 14 is provided from both ends of the stator 5 on the extension of the inner peripheral surface thereof, and the partition member 14 includes a protective tubular portion 15 and the inside thereof. Resin inner layer 16 formed integrally with
It is formed by and. The partition member 14 is the side plate 1 of the case 1.
The cooling jackets 10 and 11, which are annular spaces, are formed between the inner circumference of the cylindrical plate 1A of the case 1 and both ends of the stator 5 by reaching B and 1C.

The partition member 14 is integrally formed with the stator 5 by injection molding of a resin material inside the protective cylinder portion 15. However, the partition member 14 and the stator 5 are adhered to each other and the partition member 14 is improved. In order to prevent the coil 30 of the stator 5 from being damaged by the mold at the time of molding, it is configured as follows.

This structure and manufacturing method will be described in detail with reference to FIGS.

The teeth portion 23 of the stator core 20 shown in FIG.
As shown in FIG. 5, end plates 31 having the same width as that of FIG. 5 are arranged in close contact with both ends of the stator 5 in the axial direction, and the coil 30 is attached to the stator core 20 from the outside of the end plates 31. It is wound. As a result, the end plate 31 is integrally connected to the stator core 20 made of laminated electromagnetic steel plates.

As shown in FIGS. 6 and 7, the above-described under plates 40 are mounted on both sides of each tooth portion 23 of the stator core 20 having the coil 30 wound in this way, and the opening portion 27 of the slot 25 is attached. To block.

On the other hand, as shown in FIG. 8, a protection cylinder portion 15 made of a non-magnetic material, for example, a stainless steel cylinder, is fitted into the groove 31A provided on the end surface of each end plate 31. The protective cylinder portion 15 is arranged concentrically with the inner peripheral surface of the stator, and the inner peripheral surface of the protective cylinder portion 15 has an uneven portion.
Two annular grooves 17 are formed.

Then, a cylindrical inner die 61 which is in close contact with the inner periphery of the stator 5 is disposed so as to penetrate therethrough, and at this time, an annular space A is provided between the inner die 61 and the protective cylinder portion 15 with a predetermined gap. Compartment formation.

At the same time, the inner plate 6 and the under plate 40 arranged in the slot 25 of the stator core 20 are also arranged.
A plurality of spaces B extending in the axial direction that are defined by the space B
Are communicated with the annular space A on the inner side of the protective tube portion 15 at both ends thereof.

As shown in FIG. 9, the end surface of the under plate 40 is also provided with a fitting groove 40A for fitting with the end portion of the protective tubular portion 15, and the under plate 40 is fitted in this groove 40A.
By mating with each other, it is possible to further enhance the bondability of the protection cylinder portion 15.

In this case, the groove 31 is formed in the end plate 31.
Although the end face of the protective cylinder portion 15 may be simply contacted without providing A, if the groove 31A is provided in the end plate 31 and the end portion of the protective cylinder portion 15 is fitted also here, the inner periphery of the stator Demonstrate high bond strength evenly around the entire circumference.

With the inner die 61 thus set on the inner circumference of the stator 5, the inner die 61 and the protective cylinder 1 are
By filling the mold space between 5 and 5 with a resin material,
As shown in FIG. 10, the resin inner layer 16 is formed on both ends of the stator 5.
However, in the slot opening 27, the resin inner layer 50 corresponding to the inner circumferential surface of the stator is formed by resin injection molding in a state of being integrated with each other.

After this injection molding, the inner mold 61 is pulled out in the axial direction, but the protective cylinder portion 15 remains as it is, and the partition member 14 is formed by this and the resin inner layer 16 inside thereof.

By the way, since the inner mold 61 does not directly contact the coil 30 of the stator 5 when the inner mold 61 is pulled out, there is a concern that the coil 30 and the mold contact as in the conventional case. Therefore, it is possible to reliably prevent the insulating coating of the coil 30 from being damaged or broken.

An annular groove 17 is formed on the inner peripheral surface of the protective cylinder portion 15 to improve the adhesion to the inner resin inner layer 16, and the protective cylinder portion 15 and the end plate 31 form a groove 31A. Since they are fitted with each other through the intermediary of high rigidity, the end plate 31 is made of a non-magnetic material having a better adhesiveness to the resin inner layer 16 than the electromagnetic steel plate constituting the stator core 20, and Adhesion is also improved, and the resin inner layer 16 is provided with the slot opening 27 on the inner peripheral surface of the stator.
And the resin inner layer 50 that fills up the inner wall of the cooling member 10 and the resin inner layer 50. Refrigerant passage 29 connecting between
It is also possible to reliably prevent the cooling oil of the stator 5 that flows through from leaking from the joint surface between the stator core 20, the partition member 14, and the resin inner layer 50.

The present invention is not limited to the above-mentioned embodiments, and it is obvious that various modifications can be made within the scope of the technical idea of the invention described in the claims.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing an AA cross section of FIG.

FIG. 3 is a front view of a stator core.

FIG. 4 is a front view of an end plate.

5A and 5B show a state in which a stator core is wound, and FIG. 5A is a front view and FIG. 5B is a side view.

FIG. 6 is a partial cross-sectional view showing a state where the stator core is mounted in the case.

FIG. 7 is a partial cross-sectional view showing a state in which an under plate is also attached to the stator core.

8A and 8B also show a state in which a mold is set on the stator core, in which FIG. 8A is a front view and FIG. 8B is a side view.

FIG. 9 is a view showing a state in which a mold is set on the stator core, (A) is a front view and (B) is a side view.

10A and 10B also show a state of the stator core after resin molding, FIG. 10A being a front view and FIG. 10B being a side view.

[Explanation of symbols]

1 case, 1A Cylindrical plate 1B side plate 1C side plate 5 Stator 10 cooling jacket 11 cooling jacket 14 Partition member 15 Protective tube 16 resin inner layer 16A groove 20 Stator core 21 split cores 25 slots 27 openings 29 Refrigerant passage 30 coils 31 End plate 31A fitting groove 40 Underplate 40A mating groove 50 resin inner layer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yutaro Kaneko             Nissan, Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan             Inside the automobile corporation (72) Inventor Takashi Tsuneyoshi             Nissan, Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan             Inside the automobile corporation F-term (reference) 5H002 AD02 AD04 AD07 AD08                 5H605 AA01 CC01 CC03 CC10 DD05                       DD13 EA06 GG04                 5H609 PP02 PP05 PP06 PP08 PP09                       QQ08 QQ12 RR33 RR37 RR42                       RR43 RR75                 5H615 AA01 PP01 PP28 SS15 SS44

Claims (7)

[Claims] 1. A rotary electric machine in which a stator core is housed in the inner circumference of a case, and an opening of the slot of the stator around which the coil is wound to the inner circumferential surface of the stator is closed to form a refrigerant passage through which the refrigerant is guided. A protective cylinder portion made of a non-magnetic material having a diameter larger than that of the inner peripheral surface of the stator is joined to the end surface of the stator, and a resin inner layer is formed inside the protective cylinder portion by resin molding so as to be integrated with the protective cylinder portion. A cooling structure for a rotating electric machine is characterized in that an annular space communicating with the refrigerant passage is defined inside the case by a partition member composed of the protective cylinder portion and the resin inner layer. 2. The cooling structure for a rotating electric machine according to claim 1, wherein a concavo-convex portion is formed on an inner peripheral surface of the protective cylinder portion. 3. The cooling structure for a rotating electric machine according to claim 1, wherein a fitting portion for fitting an end portion of the protective cylinder portion to an end plate of the stator is formed. 4. The rotating electric machine according to claim 1, wherein a fitting portion is formed that fits an end portion of the protective cylinder portion with an end surface of an under plate arranged in an opening portion of an inner peripheral surface of the stator. Cooling structure. 5. A fitting portion is formed which fits an end portion of the protection cylinder portion with an end plate of the stator and also fits with an end portion of an under plate disposed on an inner peripheral surface of the stator. Alternatively, the cooling structure for the rotating electric machine according to the item 2. 6. The cooling structure for a rotating electric machine according to claim 5, wherein both the end plate and the under plate are made of a non-magnetic material having good adhesiveness to the resin inner layer. 7. A stator core is housed in the inner periphery of a case, a slot of a stator wound with a coil is closed to form a refrigerant passage inside the slot, and the slot is communicated with this refrigerant passage. In a cooling structure for a rotating electric machine, wherein an annular space for guiding a refrigerant is formed at an end of a stator, a protective cylinder made of a non-magnetic material having a diameter larger than that of an inner peripheral surface of the stator is joined to the end of the stator. The mold is placed so that it has a predetermined gap with the inner circumference of the part and penetrates the inner circumference of the stator.After filling the annular space between the protective cylinder and the mold with resin material, remove the mold. A manufacturing method characterized in that an inner resin layer is formed, and the annular space is formed between a partition member composed of a protective cylinder portion and a resin inner layer and an inner circumference of the case.