JP4710177B2 - Cooling structure for rotating electrical machine and method for manufacturing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling structure for a rotating electrical machine and a method for manufacturing the same.
[0002]
[Prior art]
In a rotating electrical machine (motor, generator, or motor / generator), in order to cool the stator efficiently, the inside of the stator slot (groove portion in which the stator coil is accommodated) is used as a refrigerant passage to make a refrigerant (for example, for cooling) Japanese Patent Laid-Open No. 4-364343 proposes a method in which a stator coil and a stator that are heat generating portions can be directly cooled.
[0003]
In the rotating electrical machine disclosed in Japanese Patent Laid-Open No. 4-364343, molds are disposed on the inner peripheral side of the stator and the inside of the slot, respectively, and an engineer plastic material is injected and filled into a space defined by the stator core and the mold. Is hardened to close the slot opening and form a refrigerant passage therein.
[0004]
[Problems to be solved by the invention]
By the way, since the coil is wound around the stator core in this case, after the engineer plastic material is injected and filled, the inserted mold is extracted, but when the outer mold is extracted, the coil contacts the coil, There is a possibility of damaging the insulation coating of the winding, and there has been a problem in maintaining the quality of the coil and thus the rotating electric machine.
[0005]
The present invention aims to solve such problems.
[0006]
[Means for Solving the Problems]
A first aspect of the present invention relates to a rotating electrical machine in which a stator core is accommodated on the inner periphery of a case, and an opening to a stator inner peripheral surface of a stator wound with a coil is closed to form a refrigerant passage through which refrigerant is guided. in the under plate for closing the opening of said slot is disposed in the slot, than the stator inside circumference to the end face of the stator to combine protecting cylinder unit made of a nonmagnetic material having a large diameter, the protecting cylinder unit and the under A resin inner layer in an integrated state is formed inside the plate by resin molding, and an annular space communicating with the refrigerant passage is partitioned inside the case by a partition member made up of the protective cylinder portion and the resin inner layer. Cooling structure to do.
[0007]
In a second aspect based on the first aspect, an uneven portion is formed on the inner peripheral surface of the protective cylinder portion.
[0008]
According to a third invention, in the first or second invention, a fitting portion for fitting an end portion of the protective cylinder portion to an end plate of the stator is formed.
[0009]
According to a fourth aspect of the present invention, in the first or second aspect of the present invention, a fitting portion is formed for fitting the end portion of the protective cylinder portion to the end surface of the under plate disposed in the opening portion of the inner peripheral surface of the stator.
[0010]
According to a fifth invention, in the first or second invention, the end portion of the protective cylinder portion is fitted to the end plate of the stator and is also fitted to the end portion of the under plate disposed on the inner peripheral surface of the stator. The fitting part to be formed is formed.
[0011]
In a sixth aspect based on the fifth aspect, the end plate and the under plate are both made of a nonmagnetic material having good adhesion to the resin inner layer.
[0012]
According to a seventh aspect of the present invention, a stator core is accommodated on the inner periphery of the case, and an opening to the stator inner peripheral surface of a slot of a stator wound with a coil is closed to form a refrigerant passage in the slot, and communicated with the refrigerant passage. In the cooling structure for a rotating electrical machine in which an annular space through which refrigerant is guided is formed at the end of the stator, an under plate that closes the opening of the slot is disposed in the slot, and the end surface of the stator has a larger diameter than the inner peripheral surface of the stator. A protective cylinder made of a non-magnetic material is coupled, a die is disposed so as to have a predetermined gap from the inner periphery of the protective cylinder and penetrate the stator inner periphery, and the protective cylinder, the under plate, and the metal After filling the resin material in the annular space between the mold and remove the mold to form a resin layer of the integrated state inside the protecting cylinder unit and the under plate, and a protecting cylinder unit and the resin inner layer specifications Manufacturing method characterized by forming the member, the annular space between the inner casing.
[0013]
Operation and effect of the invention
In the first or seventh aspect of the invention, the resin inner layer is integrally molded inside the protective cylinder portion of the non-magnetic material. This inner layer cylinder portion is formed by, for example, resin injection molding using a mold. At this time, if there is a die on the inner peripheral side of the stator, the resin filling space corresponding to the resin inner layer is formed between the outer protective cylinder portion, so that the outer die is not required, and the die As a result, contact with the stator coil, which is likely to occur when the outer mold is extracted after molding, does not occur. For this reason, damage, disconnection, etc. of the insulating coating of the coil can be reliably prevented.
[0014]
In 2nd invention, the adhesiveness with the resin inner layer with which the inner side is filled with the uneven | corrugated | grooved part of the inner periphery of a protection cylinder part is improved.
[0015]
According to the third, fourth, fifth, and sixth inventions, the connectivity between the protective cylinder portion and the end plate or the under plate of the stator core is enhanced.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0017]
1 and 2 show the entire configuration of a rotating electrical machine (motor, generator, or motor / generator).
[0018]
In FIG. 1, a case 1 of a rotating electrical machine includes a cylindrical plate 1A and side plates 1B and 1C that close openings at both axial ends of the cylindrical plate 1A.
[0019]
A cylindrical rotor 2 is accommodated in the case 1. The rotor 2 has both ends of a rotating shaft 2A supported by side plates 1A and 1B via bearings 3, respectively, and is rotatable about the rotating shaft 2A.
[0020]
A cylindrical stator 5 is disposed on the inner peripheral surface of the cylindrical plate 1 </ b> A 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.
[0021]
Cooling jackets 10 and 11 made of an annular space are formed between the axial ends of the stator 5 and the inside of the case 1. Cooling oil is supplied to the cooling jacket 10 through an oil supply port 16 penetrating the cylindrical plate 1A. 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.
[0022]
As shown in FIG. 2, the stator 5 includes a stator core 20 and a coil 30 wound around the stator core 20.
[0023]
The starter core 20 is configured by connecting a predetermined number (12 in this embodiment) of split cores 21 in an annular shape (split core structure). Each divided 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 (perpendicular to the paper surface of FIG. 2).
[0024]
The stator core 20 (divided 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 a teeth portion 23 protruding from the back core portion 22 in the radially inner radial direction of the stator core 20. (However, see FIG. 3).
[0025]
A recess (groove) between adjacent tooth portions 23 becomes a slot 25, and the coil 30 is housed inside the slot 25 by being concentratedly wound around each tooth portion 23.
[0026]
In order to make this slot 25 a refrigerant passage 29 through which the cooling oil from the cooling jacket 10 passes, an under plate 40 is attached to the opening 27 facing the outer periphery of the rotor 2 in the slot 25 (however, FIG. 7). Note that the under plate 40 is inserted and held between the axially extending ridges 28A and 28B provided on both side surfaces near the tip of the tooth portion 23, and on the outer side (rotor side) as described later. The resin material is filled so as to be flush with the inner peripheral surface of the stator, the resin inner layer 50 is formed, and the refrigerant passage 29 is sealed.
[0027]
In order to form the cooling jackets 10 and 11, a cylindrical 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 is integrated with the protective cylinder portion 15 and the inside thereof. The resin inner layer 16 is formed. The partition member 14 reaches the side plates 1B and 1C of the case 1, and forms cooling jackets 10 and 11 which are annular spaces between the inner periphery of the cylindrical plate 1A of the case 1 and both ends of the stator 5. Yes.
[0028]
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 improves the adhesion between the partition member 14 and the stator 5, and is made of gold during resin molding. In order to prevent the coil 30 of the stator 5 from being damaged by the mold, it is configured as follows.
[0029]
The configuration and the manufacturing method will be described in detail with reference to FIGS.
[0030]
End plates 31 as shown in FIG. 4 having the same width as the teeth 23 of the stator core 20 in FIG. 3 are arranged in close contact with both axial ends of the stator 5 as shown in FIG. The stator core 20 is wound from the outside of the end plate 31. As a result, the end plate 31 is integrally coupled to the stator core 20 made of laminated electromagnetic steel plates.
[0031]
As shown in FIGS. 6 and 7, the under plate 40 is attached to both sides of each tooth portion 23 of the stator core 20 around which the coil 30 is wound in this manner, thereby closing the opening 27 of the slot 25. .
[0032]
On the other hand, as shown in FIG. 8, for example, a stainless cylindrical protection cylinder portion 15 made of a nonmagnetic material is fitted into the groove 31 </ b> A provided on the end face of each end plate 31. The protective cylinder portion 15 is disposed concentrically with the inner peripheral surface of the stator, and two annular grooves 17 are formed on the inner peripheral surface of the protective cylinder portion 15 as uneven portions.
[0033]
A cylindrical inner mold 61 that is in close contact with the inner periphery of the stator 5 is disposed so as to penetrate, and at this time, an annular space A is defined with a predetermined gap between the inner mold 61 and the protective cylinder portion 15. .
[0034]
At the same time, a plurality of axially extending spaces B defined between the under plate 40 and the inner mold 61 disposed in the slots 25 of the stator core 20 are formed inside the protective cylinder portion 15 at both ends thereof. It communicates only with the annular space A.
[0035]
As shown in FIG. 9, the end surface of the underplate 40 is also provided with a fitting groove 40A for fitting with the end of the protective cylinder portion 15, and the underplate 40 is fitted into the groove 40A to protect the underplate 40. The connectivity of the cylindrical portion 15 can be further enhanced.
[0036]
In this case, the end plate 31 may not be provided with the groove 31A, but may simply be brought into contact with the end surface of the protective cylinder portion 15. However, the end plate 31 is provided with a groove 31A, and the end portion of the protective cylinder portion 15 is also provided here. When they are fitted, high joint strength is evenly exhibited on the entire inner circumference of the stator.
[0037]
In the state where the inner mold 61 is set on the inner periphery of the stator 5 in this way, the mold space between the inner mold 61 and the protective cylinder portion 15 is filled with the resin material, and as shown in FIG. As described above, the inner resin layer 16 is formed at both ends of the stator 5, and the inner resin layer 50 coinciding with the inner peripheral surface of the stator is formed in the slot opening 27 by resin injection molding.
[0038]
After this injection molding, the inner mold 61 is extracted 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 inner resin inner layer 16.
[0039]
By the way, when the inner mold 61 is extracted, the inner mold 61 does not come into direct contact with the coil 30 of the stator 5. Therefore, it is possible to reliably prevent the insulating film of the coil 30 from being damaged or disconnected.
[0040]
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 are fitted via the groove 31A. Therefore, the end plate 31 is made of a non-magnetic material having better adhesion to the resin inner layer 16 than the electromagnetic steel plate constituting the stator core 20, so that the adhesion between them is also improved. Further, the resin inner layer 16 is also firmly and integrally bonded to the resin inner layer 50 filling the slot opening 27 on the inner peripheral surface of the stator. As a result, the coupling strength between the partition member 14 and the stator 5, and The liquid tightness of the joint surface is also increased, and the cooling oil for the stator 5 flowing through the cooling jackets 10 and 11 and the refrigerant passage 29 connecting them is used for the stator core 20, the partition member 14, and the resin inner layer. 0 and that leaked from the joint surface can be reliably prevented.
[0041]
The present invention is not limited to the embodiments described above, and it is obvious that various modifications are possible within the scope of the technical idea of the invention described in the claims.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a rotating electrical machine according to an embodiment of the present invention.
2 is a cross-sectional view taken along the line AA of FIG.
FIG. 3 is a front view of a stator core.
FIG. 4 is a front view of an end plate.
FIGS. 5A and 5B show a state in which a winding is applied to a stator core, where 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 on the case.
FIG. 7 is a partial cross-sectional view showing a state where an under plate is mounted on the stator core.
FIGS. 8A and 8B show a state in which a mold is set on the stator core, where FIG. 8A is a front view and FIG. 8B is a side view.
FIGS. 9A and 9B show a state in which a mold is set on the stator core, where FIG. 9A is a front view and FIG. 9B is a side view.
10A and 10B show the state of the stator core after resin molding, in which FIG. 10A is a front view and FIG. 10B is 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 Protection cylinder 16 Resin inner layer 16A Groove 20 Stator core 21 Split core 25 Slot 27 Opening 29 Refrigerant passage 30 Coil 31 End plate 31A Fitting groove 40 Under plate 40A Fitting groove 50 Resin inner layer

Claims (7)

In a rotating electrical machine that houses a stator core on the inner periphery of a case, closes an opening to a stator inner peripheral surface of a slot of a stator wound with a coil, and forms a refrigerant passage through which a refrigerant is guided into the slot. An under plate that closes the portion is disposed in the slot, and a protective cylinder made of a nonmagnetic material having a diameter larger than the inner peripheral surface of the stator is coupled to the end face of the stator, and resin molding is performed inside the protective cylinder and the under plate. A rotating structure for a rotating electrical machine, wherein a resin inner layer in an integrated state is formed, and an annular space communicating with the refrigerant passage is partitioned inside the case by a partition member comprising the protective cylinder portion and the resin inner layer . The cooling structure for a rotating electric machine according to claim 1, wherein an uneven portion is formed on an inner peripheral surface of the protective cylinder portion. The cooling structure for a rotating electrical 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. 3. The cooling structure for a rotating electrical machine according to claim 1, wherein a fitting portion is formed for fitting an end portion of the protective cylinder portion to an end surface of an under plate disposed in an opening portion of an inner peripheral surface of the stator. The end portion of the protective cylinder portion is fitted to the end plate of the stator, and a fitting portion is formed to fit the end portion of the under plate disposed on the inner peripheral surface of the stator. Cooling structure for rotating electrical machines. 6. The rotating electrical machine cooling structure according to claim 5, wherein both the end plate and the under plate are formed of a nonmagnetic material having good adhesion to the resin inner layer. A stator core is accommodated in the inner periphery of the case, an opening to the stator inner peripheral surface of a stator-wound slot is closed to form a refrigerant passage in the slot, and an annular passage through which the refrigerant is guided In a rotating electrical machine cooling structure in which a space is formed at an end of a stator, an under plate that closes the opening of the slot is disposed in the slot, and the end surface of the stator is made of a nonmagnetic material having a larger diameter than the inner peripheral surface of the stator. An annular space is formed between the protective cylinder part and the underplate and the mold by connecting the protective cylinder part, having a predetermined gap with the inner circumference of the protective cylinder part, and penetrating the inner circumference of the stator. to then filled with resin material, and the partition member to remove the mold to form a resin layer of the integrated state inside the protecting cylinder unit and the under plate, and a protecting cylinder unit and the resin inner layer, cable Manufacturing method characterized by forming the annular space between the inner peripheral.

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