JP7117149B2 - Varnish impregnation device, varnish impregnation method - Google Patents

Description

TECHNICAL FIELD Embodiments of the present invention relate to a varnish impregnation device and a varnish impregnation method for impregnating a coil provided in a stator of a rotating electric machine with varnish.

2. Description of the Related Art Conventionally, a stator for a rotating electric machine is impregnated with varnish and solidified as a whole in order to prevent the formed coil from collapsing in shape. This varnish impregnation is generally carried out by dripping varnish onto the coil ends while rotating the stator while supporting it from the inner peripheral surface side. At this time, several devices and methods have been proposed to prevent the varnish from adhering to the support surface that supports the stator (see, for example, Patent Document 1).

JP 2015-76967 A

Now, in an actual manufacturing site, there are cases where a plurality of types of stators are manufactured, for example, stators with different inner diameters. In that case, since it is difficult to prepare a chuck for supporting the stator for each shape of the stator mainly from a cost standpoint, the same chuck may be used to support the stator.

However, when the same chuck is used to support different types of stators, depending on the shape of the stator, a slight gap may be created between the inner peripheral surface of the stator and the support surface of the chuck, and the varnish may accumulate there. There is a risk of
Therefore, a varnish impregnation device and a varnish impregnation method capable of preventing the varnish from remaining between the inner peripheral surface of the stator and the support surface of the chuck are provided.

An iron core varnish impregnation device according to an embodiment includes a rotating shaft member, a chuck that is provided so as to be able to expand and contract radially outward from the rotating shaft member, a chuck that rotatably supports a stator from the inner peripheral surface side, and a thermally expandable chuck. a sealing member formed of a resin material having the , provided.

A diagram schematically showing a varnish impregnation apparatus according to a first embodiment. FIG. 4 is a diagram schematically showing a state in which the varnish impregnation device is viewed from the axial direction; Schematically shows a circumferential gap formed between a support surface and an inner peripheral surface. Schematic diagram of an axial gap formed between a support surface and an inner peripheral surface. The figure which shows typically the aspect which a sealing member thermally deforms. The figure which shows typically the varnish impregnation apparatus by 2nd Embodiment. FIG. 4 is a diagram schematically showing a plurality of configuration examples of blow-out holes;

A plurality of embodiments will be described below with reference to the drawings. Moreover, the same code|symbol is attached|subjected and demonstrated to the substantially common part in each embodiment. Also, for simplification of explanation, the same reference numerals are given to the varnish impregnation devices.
(First embodiment)

As shown in FIG. 1, the varnish impregnation apparatus of the present embodiment (hereinafter simply referred to as impregnation apparatus 1) includes a rotating shaft member 2 and an expandable member 3 which is provided so as to extend and contract radially outward from the rotating shaft member 2. and a chuck 5 for rotatably supporting the stator 4 from the inner peripheral surface 4a side. The stator 4 is used in a rotating electrical machine, and is formed by stacking core pieces 6 (see FIG. 3) punched out of thin electromagnetic steel plates in an annular shape, or by winding split cores.

The stator 4 is formed with a plurality of slots 7 (see FIG. 3) extending axially through the stator 4 and opening in the inner peripheral surface 4a. A coil 8 that has been wound in an annular shape in advance is inserted into the slot 7, and the portions of the coil 8 protruding to both sides in the axial direction of the stator 4 are gathered to form a so-called coil end 8a. In addition, in FIG. 1, the coil 8 is hatched for simplification of explanation.

As shown in FIG. 2, the impregnation apparatus 1 of this embodiment has three chucks 5 equidistantly arranged in the circumferential direction. After the impregnation device 1 is inserted into the inner peripheral side of the stator 4 with the elastic member 3 contracted, the elastic member 3 is extended to press the chuck 5 against the inner peripheral surface 4a, thereby moving the stator 4 inside. It is structured to be supported from the side of the peripheral surface 4a. It should be noted that the number of chucks 5 is an example, and the number may of course be different.

A sealing member 9 is provided on the surface of the chuck 5 , that is, on the surface facing the inner peripheral surface 4 a of the stator 4 . A surface facing the inner peripheral surface 4a of the stator 4 is hereinafter referred to as a support surface 5a. The sealing member 9 provided on the support surface 5a is made of a thermally expandable resin material, and thermally expands at a temperature during preliminary drying before the varnish 11 is actually impregnated, as will be described later. characteristics are used.

When impregnating the varnish 11, the impregnating device 1 is used to support the stator 4 from the inner peripheral surface 4a side, and the stator 4 is rotated as indicated by the arrow R and heated for pre-drying. The coil ends 8a and the coils 8 in the stator 4 are impregnated with the varnish 11 by dripping the varnish 11 from the supply nozzle onto the coil ends 8a on both sides in the axial direction from the outer peripheral side and the inner peripheral side. It should be noted that the stator 4 continues to rotate from the time of predrying to the time of hardening.

Next, the operation of the configuration described above will be described.
As described above, in an actual manufacturing site, there are cases where a plurality of types of stators 4 are manufactured, such as those having different inner diameters. In that case, depending on the type of the stator 4, a gap (S) may be formed between the inner peripheral surface 4a of the stator 4 and the support surface 5a of the chuck 5, as shown in FIG. will be formed. At this time, it is considered that the gap (S) is widened between both ends of the chuck 5 in the circumferential direction.

Further, as shown in FIG. 4 viewed from the direction of arrow IV in FIG. 3, there is a possibility that the positions of the laminated core pieces 6 are different in the axial direction. This is because although the core pieces 6 are formed by punching with high precision, there is a possibility that the positions of the core pieces 6 may deviate slightly toward the inner circumference due to slight displacement during lamination or pressure in the lamination direction during welding. Because. In FIG. 4, the deviation of the core pieces 6 is intentionally enlarged for the sake of explanation.

Thus, the support surface 5a of the chuck 5 may form a gap (S) with the inner peripheral surface 4a of the stator 4 both in the circumferential direction and the axial direction of the stator 4 . If the varnish 11 stays in the gap (S) during impregnation with the varnish 11, the varnish 11 solidifies and remains on the inner peripheral surface 4a of the stator 4. Therefore, it is necessary to remove the remaining varnish 11 in a subsequent step. There is

Therefore, if the varnish 11 is prevented from staying in the range of the support surface 5a, it is considered that the post-process for removing the varnish 11 adhering to the inner peripheral surface 4a of the stator 4 becomes unnecessary.

Therefore, in this embodiment, as shown in FIG. The sealing member 9 has a thin plate shape along the support surface 5a of the chuck 5 at room temperature, but when heated during predrying, it deforms so as to fill the gap (S). Hereinafter, a mode in which the sealing member 9 is deformed so as to fill the gap (S) by being heated will be referred to as thermal deformation for convenience. At this time, although not shown, the sealing member 9 is thermally deformed so as to fill the steps of the core pieces 6 also in the axial direction. In addition, in FIG. 5, the sealing member 9 is hatched for simplification of explanation.

Therefore, if this impregnation apparatus 1 is used, it is possible to eliminate the gap (S) between the support surface 5a of the chuck 5 and the inner peripheral surface 4a of the stator 4, and the varnish 11 flowing out from the slot 7 side is removed from the chuck 5. It is possible to suppress the risk of staying between the support surface 5 a of the stator 4 and the inner peripheral surface 4 a of the stator 4 . At this time, if the sealing member 9 expands slightly to the outside of the support surface due to thermal deformation, it is possible to prevent the varnish 11 from entering along the inner peripheral surface 4a rather than from the slot 7 side.

In other words, the process of supporting the stator 4 using the chuck 5 provided with the sealing member 9 and heating the stator 4 together with the chuck 5 to dry it, and the impregnation method of dripping the varnish 11 onto the coil 8 of the stator 4 are employed. By doing so, it is possible to suppress the risk of the varnish 11 staying before the varnish 11 is impregnated.

According to the impregnation apparatus 1 and the impregnation method described above, the following effects can be obtained.
The impregnation device 1 is provided with a rotating shaft member 2 and a chuck 5 that rotatably supports a stator 4 from the inner peripheral surface 4a side, and a chuck 5 that supports a stator 4 from the inner peripheral surface 4a side. It is formed of a resin material having a sealing structure, is provided on the support surface 5a of the chuck 5 that supports the stator 4, and is thermally deformed to fill the gap between the support surface 5a and the inner peripheral surface 4a of the stator 4. a member 9;

As a result, the sealing member 9 expands due to the heat applied when the varnish 11 is impregnated, and the expanded sealing member 9 is thermally deformed. The gap (S) is filled. Therefore, it is possible to prevent the varnish 11 from staying between the support surface 5a and the inner peripheral surface 4a.

In the method of impregnating the varnish 11, the stator 4 is impregnated using the chuck 5 provided with the sealing member 9 made of a resin material having thermal expansibility on the support surface 5a that rotatably supports the stator 4 from the inner peripheral surface 4a side. a step of pre-drying the stator 4 together with the chuck 5 by heating it; and a step of dripping the varnish 11 onto the coils 8 of the stator 4 .

With such an impregnation method, the sealing member 9 expands due to the heat applied when the varnish 11 is impregnated, and the expanded sealing member 9 is thermally deformed. Since the gap (S) between the chuck 5 and the inner peripheral surface 4a is filled, it is possible to prevent the varnish 11 from remaining between the support surface 5a and the inner peripheral surface 4a of the chuck 5 before the varnish 11 is actually dropped. .

(Second embodiment)
The second embodiment differs from the first embodiment in the configuration for preventing the varnish 11 from remaining in the gap (S) between the support surface 5a of the chuck 5 and the inner peripheral surface 4a of the stator 4. FIG.

As shown in FIG. 5, the impregnation apparatus 1 of the second embodiment passes through the inside of the rotating shaft member 2, the inside of the expandable member 3, and the inside of the chuck 5, and the blowout provided on the support surface 5a of the chuck 5. A gas passage 20 is formed for blowing out gas from the hole (see FIG. 6). Air, for example, is supplied to the gas path 20 from a supply device (not shown). Gases other than air can also be used.

The support surface 5a of the chuck 5 is formed with a blowout hole 21 shown in FIG. For example, as shown as an elongated hole structure in FIG. 6, the support surface 5a is formed with an elongated outlet hole 21A extending in the axial direction and having semicircular ends. The blow-out hole 21A may have, for example, a rectangular shape, a rectangular shape with chamfered corners, or the like, in addition to the elongated hole shape.

The blowout hole 21A is formed inside a region (H) separated from the outer edge of the support surface 5a by a predetermined distance (D1) in the circumferential direction and by a predetermined distance (D2) in the axial direction. . Gas is blown out from the blowing holes 21A when the varnish 11 is impregnated.

That is, in the present embodiment, the stator 4 is supported using the chuck 5 having the blowout holes 21 for blowing out the gas in the support surface 5a that rotatably supports the stator 4 from the inner peripheral surface 4a side. The impregnation of the varnish 11 is performed by dripping the varnish 11 onto the coil 8 of the stator 4 in a state in which the is blown out.

In this case, since the gap (S) is filled with the gas from the blowout hole 21A, the varnish 11 simply dropped is prevented from entering the gap (S) by the pressure of the gas. In addition, since the blowout hole 21A is provided inside the region (H), it is possible to prevent gas from escaping to the outside of the support surface 5a without filling the gap (S).

In addition, in the case of the long hole-shaped blowing holes 21A, the gas blows outward from the center of the support surface 5a in the circumferential direction, and the gas blows out substantially evenly in the axial direction. It is possible to effectively fill the gap (S) with the surface 4a with the gas.

Therefore, it is possible to prevent the varnish 11 from remaining in the gap (S) between the support surface 5a of the chuck 5 and the inner peripheral surface 4a of the stator 4. FIG. In this case, a plurality of blowout holes 21A may be provided in the circumferential direction.

Further, as shown in FIG. 6 as a circular hole structure, a plurality of circular blowout holes 21B may be provided in the support surface 5a. In this case, the gas is blown out evenly over substantially the entire support surface 5a, preventing the varnish 11 from remaining in the gap (S) between the support surface 5a of the chuck 5 and the inner peripheral surface 4a of the stator 4. can.

Further, as shown in FIG. 6 as a center deflection structure, there is provided a blowout hole 21C that relatively increases the amount of gas blowout from the center side of the support surface 5a, that is, from the center side in the circumferential and axial directions. You can also In this case, the blowing amount can be similarly deflected by making the density of the circular blowing holes 21B different between the center side and the outer edge side.

When the amount of gas blown on the outer edge side is relatively large, the pressure on the center side may decrease and the varnish 11 may accumulate on the center side, but by increasing the pressure on the center side relatively, The varnish 11 can be so-called expelled to the outside of the support surface 5a, and the varnish 11 can be prevented from remaining in the gap (S).

In addition, in the case of these long hole structure, round hole structure, and center deflection structure, since both axial ends of the support surface 5a are open to the outside (see FIG. 3), the gas flowing outward in the axial direction from the gap (S) is formed, and it is possible to prevent the varnish 11 from flowing along the inner peripheral surface 4a of the coil 8 and entering the gap (S) from the axial direction.

Conversely, as shown as a packing structure in FIG. 6, it is also possible to adopt a configuration in which the outer edge of the support surface 5a outside the blowout holes 21 is sealed with a sealing member 9. As shown in FIG. In this case, instead of sealing the four sides of the support surface 5a as in the packing structure of FIG. can also

By providing such a sealing member 9, it is possible to avoid a situation in which the blown gas escapes as it is outside the range of the support surface 5a and the gap (S) cannot be filled with a sufficient pressure. 11 can be more reliably prevented from staying. In this case, it is possible to prevent the varnish 11 from flowing along the inner peripheral surface 4a of the coil 8 and entering the gap (S) from the axial direction.

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

In the drawings, 1 is an impregnation device (varnish impregnation device), 2 is a rotating shaft member, 3 is an expansion member, 4 is a stator, 4a is an inner peripheral surface, 5 is a chuck, 5a is a support surface, 8 is a coil, and 8a is a coil. End (coil), 9 is a sealing member, 11 is varnish, and 21, 21A to 21C are blowing holes.

Claims (5)

A varnish impregnating device for impregnating a coil provided in a stator of a rotating electric machine with varnish,
a rotating shaft member;
a chuck that is provided so as to be able to expand and contract radially outward from the rotary shaft member and that rotatably supports the stator from the inner peripheral surface side;
It is made of a resin material having thermal expansibility and is provided on the support surface of the chuck that supports the stator. a sealing member that deforms to fill a gap between the surface and the inner peripheral surface of the stator;
A varnish impregnation device comprising: A varnish impregnating device for impregnating a coil provided in a stator of a rotating electric machine with varnish,
a rotating shaft member;
It is provided so as to be expandable and contractible radially outward from the rotating shaft member, and rotatably supports the stator from the inner peripheral surface side, and the support surface and the inner peripheral surface of the stator are arranged on the support surface that supports the stator. a chuck having a blowout hole for blowing out gas in a gap between the
A varnish impregnation device comprising: It is provided on the outer edge portion of the support surface of the chuck outside the blowout hole, is made of a resin material having thermal expansion, and is thermally expanded so that the support surface and the inner peripheral surface of the stator are separated from each other. 3. The varnish impregnating apparatus according to claim 2, further comprising a sealing member that deforms so as to fill the gap between them. A varnish impregnation method for impregnating a coil provided in a stator of a rotating electric machine with varnish,
a step of supporting the stator using a chuck provided with a sealing member formed of a resin material having thermal expansibility on a supporting surface for rotatably supporting the stator from the inner peripheral surface side;
a step of heating the stator together with the chuck to thermally expand and dry the sealing member ;
dripping varnish onto the coils of the stator;
A varnish impregnation method comprising: A varnish impregnation method for impregnating a coil provided in a stator of a rotating electric machine with varnish,
a step of supporting the stator using a chuck having a support surface for rotatably supporting the stator from the inner peripheral surface side and having a blowout hole for blowing out gas;
a step of dripping varnish onto the coil of the stator while the gas is being blown out from the blowing hole;
A varnish impregnation method comprising:

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