JP5343661B2 - Varnish impregnation device and varnish impregnation method for stator for rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and a method for stably impregnating a stator for rotary electric machines with varnish in a short time. <P>SOLUTION: In the varnish impregnation device 1 for stators 7 for rotary electric machines, a stator 7 is supported by closing the entire gaps between magnetic steel sheets 81 with an inner circumference closing means 3 and an outer circumference closing means 4, bringing one coil end portion 711, protruded from one end face 801 of a stator core 8 in the axial direction, into contact with varnish W in a varnish reservoir 2, and shielding the openings 821 of slots 82 at the one end face 801 in the axial direction from the outside air. Thereafter, the closed space 50 is depressurized by a depressurising means 61 to make the pressure in the closed space 50 lower than the liquid pressure (atmospheric pressure) of the varnish W. Impregnation of the varnish W is facilitated from one coil end portion 711 to the gaps in the slots 82 and the surface of the coil 71. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a varnish impregnation apparatus and a varnish impregnation method for impregnating a gap in a plurality of slots and a surface of a coil in a stator for a rotating electrical machine with an insulating varnish.

The coil disposed in the stator for the rotating electrical machine is impregnated with an insulating varnish to the coil after being disposed in the stator core in order to fix the coil to the slot of the stator core, insulate the conductive wires of the coil, and the like. .
For example, in the varnish impregnation device for the coil portion of the stator of Patent Document 1, the cylindrical stator is held up and down by the holding device, the container for storing the varnish liquid is disposed below the holding device, and the lifting device By this, it is disclosed that the coil part on the lower side of the stator is immersed in the varnish liquid in the container by moving either the holding device or the container up and down. Thereby, without attaching a varnish to the outer peripheral surface of a case of a stator, while making a varnish adhere only to a coil part, productivity is raised and the consumption of a varnish is reduced.

  Further, for example, in the varnish processing apparatus of Patent Document 2, the stator is held by an elastic body with respect to a rotation shaft provided in the horizontal direction, and the stator is rotated by rotation of the rotation shaft while rotating the stator in the axial direction end surface. It is disclosed that a varnish is dropped on a coil end portion which is a part of a coil protruding from the coil, and this varnish penetrates into the slots of the stator core and the surface of the coil. Accordingly, it is possible to prevent the varnish from adhering to the inner peripheral side of the stator core and the coil portion, and to reliably fix the stator to the rotating shaft.

  In addition, for example, in the varnish impregnation method for electric equipment of Patent Document 3, the winding and the iron core are more airtight in the bag, the inside of the bag is decompressed, and the varnish in the bag is wound on the winding and the iron core in this decompressed state Impregnation is disclosed. As a result, the varnish can be impregnated in a reduced pressure state, and the varnish can be impregnated into a narrow space between the strands of the winding or between the winding and the iron core.

JP-A-9-149609 JP 2007-202354 A JP-A-4-112651

In the varnish impregnation apparatus of Patent Documents 1 and 2, the so-called capillary phenomenon is used to infiltrate the varnish into the plurality of slots and the surface of the coil. However, although it is easy to infiltrate the varnish into the coil end portion, it is not easy to infiltrate the varnish into the narrow gaps between the conductors of the coil and between the conductors and the insulating paper in a plurality of slots. Absent. Therefore, in order to shorten the time for impregnating the varnish into the slot, the varnish impregnation apparatus of Patent Documents 1 and 2 is not sufficient.
Moreover, in the varnish impregnation method of the said patent document 3, a varnish and a stator are arrange | positioned in a flexible flexible bag, and pressure reduction is performed. Therefore, the stator cannot be stably supported, and it is not sufficient to keep the varnish in contact with the coil end portion stably.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a varnish impregnation device and a varnish impregnation method for a stator for a rotating electrical machine that can perform stable varnish impregnation in a short time.

The first reference invention relates to a stator for a rotating electrical machine in which coils are arranged in a plurality of slots in a stator core in which a plurality of electromagnetic steel plates are laminated in the axial direction, on the gaps in the plurality of slots and on the surfaces of the coils. A device for impregnating the insulating varnish,
A varnish storage container for storing the varnish;
From the inner peripheral side of the stator core, inner peripheral closing means for closing the entire gap between the plurality of electromagnetic steel sheets,
From the outer peripheral side of the stator core, outer periphery closing means for closing the entire gap between the plurality of electromagnetic steel sheets,
A space forming means for covering the opening at the other end surface in the axial direction of the plurality of slots and forming a closed space for blocking the opening from outside air;
Pressure reducing means for decompressing the closed space in the space forming means,
The space forming means has a container shape formed by forming a facing portion facing the other end surface in the axial direction of the stator core, and an outer peripheral arrangement portion standing in an annular shape from the facing portion and disposed on the outer peripheral side of the stator core. Frame,
The inner peripheral closing means is composed of a rubber tube that is in close contact with the inner peripheral surface of the stator core by inflating with gas inside.
The outer periphery closing means is constituted by an annular rubber tube that is held in the outer peripheral arrangement portion and is in close contact with the outer peripheral surface of the stator core by inflating with gas inside.
One of the coil end portions that is a part of the coil protruding from one end surface in the axial direction of the stator core by closing the entire gap between the plurality of electromagnetic steel sheets by the inner peripheral closing means and the outer peripheral closing means, The state in which the openings in the axial end surfaces of the plurality of slots are blocked from outside air, or the axial end surfaces of the one coil end portion and the stator core are in contact with the varnish in the varnish storage container. After immersing in the varnish in the varnish storage container, forming a state in which the openings in the axial end surfaces of the plurality of slots are opened in the varnish in the varnish storage container, and supporting the stator, the decompression The closed space is reduced by means, and the pressure in the closed space is made lower than the hydraulic pressure of the varnish, whereby the one coil end portion is In varnish impregnation apparatus of the rotary electric machine stator, characterized by being configured so as to facilitate penetration of the varnish into the gap and the surface of the coil Luo in said plurality of slots.

  The varnish impregnation device for a stator for a rotating electrical machine according to the present invention has a pressure at one end surface in the axial direction of the stator core that is lower than the hydraulic pressure of the varnish at one end surface in the axial direction of the stator core. A contrivance is made to facilitate the penetration of the varnish from the coil end portion toward the other end side in the axial direction. Moreover, the varnish impregnation device for a stator for a rotating electrical machine according to the present invention is devised to stably support a stator on a varnish storage container and to stably impregnate the varnish.

Specifically, the varnish impregnation apparatus of the present invention includes the varnish storage container, the inner periphery closing means, the outer periphery closing means, and the space forming means, and these can stably support the stator on the varnish storage container. it can.
That is, the space forming means is composed of a container-like frame, and the inner peripheral closing means and the outer peripheral closing means are both composed of rubber tubes. Thereby, the rubber tube constituting the inner peripheral closing means is arranged on the inner peripheral side of the stator, and the annular rubber tube constituting the outer peripheral closing means on the outer peripheral side of the stator and the instrumental frame constituting the space forming means An outer peripheral arrangement part is arranged, and gas is put into each rubber tube to be expanded.

At this time, the rubber tube constituting the inner peripheral closing means is in close contact with the inner peripheral surface of the stator core, and the annular rubber tube constituting the outer peripheral closing means is in close contact with the outer peripheral surface of the stator core to constitute the stator core. The entire gap between the plurality of electromagnetic steel sheets can be closed from the inner peripheral side and the outer peripheral side of the stator core. Thereby, a stator can be supported stably.
Further, the closed frame in which the openings at the other axial end surfaces of the plurality of slots are blocked from the outside air can be formed by the instrumental frame constituting the space forming means.

Further, when the stator supported by the inner periphery closing means, the outer periphery closing means, and the space forming means is installed in the varnish storage container, no gas escape occurs when the pressure reducing means decompresses the closed space of the space forming means. Thus, the axial direction one end surface side of the stator core is closed. Specifically, the space between one axial end surface of the stator core and the opening tip of the varnish storage container is sealed, and the openings at the one axial end surfaces of the plurality of slots are blocked from outside air (outside the varnish storage container). A state in which one end surface in the axial direction of the stator core is immersed in the varnish in the varnish storage container, and an opening in one end surface in the axial direction of the plurality of slots is opened in the varnish in the varnish storage container. To do.
Thereby, one coil end part which protrudes from the axial direction one end surface of a stator core can be made to contact the varnish in a varnish storage container stably.

  Then, the closed space is depressurized by the depressurizing means, and evacuation is performed from the openings in the other axial end surfaces of the plurality of slots. At this time, the closed space is in a vacuum state, and the pressure in the closed space is lower than the liquid pressure of the varnish. Thereby, the attraction | suction force which osmose | permeates a varnish to the axial direction other end surface side of a stator core can be generated. In addition, since the entire gap between the magnetic steel plates constituting the stator core is closed by the inner peripheral side closing means and the outer peripheral side closing means, the suction force toward the other axial end surface side of the stator core is reduced to a plurality of slots. It can act only on the inner gap. Accordingly, it is possible to effectively promote the penetration of the varnish from the one coil end portion into the gaps in the plurality of slots and the surface of the coil. And the time which impregnates a varnish in a slot can be shortened. In particular, the varnish can be effectively infiltrated from one coil end portion to the other coil end portion in a plurality of slots, between the coil conductor wires, into a narrow gap between the conductor wires and the insulating paper.

In addition, as described above, the stator is stably supported on the varnish storage container by the inner periphery closing means, the outer periphery closing means, and the space forming means, thereby preventing the contact state of the varnish with the stator from becoming unstable. And varnish impregnation can be performed stably.
Therefore, according to the varnish impregnation device for a stator for a rotating electrical machine of the present invention, the stator can be stably supported and stable varnish impregnation can be performed in a short time.

The second invention provides a stator for a rotating electrical machine in which coils are arranged in a plurality of slots in a stator core in which a plurality of electromagnetic steel plates are laminated in the axial direction. An apparatus for impregnating an insulating varnish,
A varnish storage container for storing the varnish;
Inner circumferential communication closing means for closing the axial communication state of the stator core in the axial direction;
A space forming means for covering the opening at the other end surface in the axial direction of the plurality of slots and forming a closed space for blocking the opening from outside air;
Decompression means for decompressing the closed space in the space forming means;
A pressing means for pressing the other axial end surface of the stator core toward the opening tip of the varnish storage container;
The varnish storage container has its opening tip portion closely attached to an axial end surface of the stator core via a sealing material, and the openings at the axial end surfaces of the plurality of slots are blocked from outside air. Configured to form a state,
The space forming means is configured to form a state in which the opening tip is in close contact with the other axial end surface of the stator core via a sealing material,
The inner peripheral communication blocking means closes the axially connected state of the stator core in the axial direction, and one coil end portion that is a part of the coil protruding from one axial end surface of the stator core is connected to the varnish. By contacting the varnish in the storage container and pressing the other axial end surface of the stator core by the pressing means, the gap between the plurality of electrical steel sheets constituting the stator core is eliminated, and the space forming means The opening tip of the stator core is in close contact with the other axial end surface of the stator core via a sealing material, and the opening tip of the varnish storage container is in close contact with the one axial end surface of the stator core via the sealing material After the stator is supported, the closed space is decompressed by the decompression means, and the pressure in the closed space is made lower than the hydraulic pressure of the varnish. The varnish impregnation device for a stator for a rotating electrical machine is configured to promote the penetration of the varnish from the one coil end portion into the gaps in the plurality of slots and the surface of the coil. Claim 1 ).

  The varnish impregnation device for a stator for a rotating electrical machine according to the present invention also has one of the ones protruding from one end surface in the axial direction by making the pressure at the other end surface in the axial direction of the stator core lower than the hydraulic pressure of the varnish at one end surface in the axial direction of the stator core. A contrivance is made to facilitate the penetration of the varnish from the coil end portion toward the other end side in the axial direction. Moreover, the varnish impregnation device for a stator for a rotating electrical machine according to the present invention is also devised to stably support the stator on a varnish storage container and to stably impregnate the varnish.

Specifically, the varnish impregnation device of the present invention includes the varnish storage container, the inner peripheral communication blocking means, the space forming means, and the pressing means, and these can stably support the stator on the varnish storage container. it can.
That is, in the present invention, by pressing the other axial end surface of the stator core by the pressing means, the stator core is sandwiched between the opening tip of the varnish storage container, and the gap between the plurality of electrical steel sheets constituting the stator core Can be eliminated. And by pressing with a press means, a stator can be stably supported to a varnish storage container.
Further, the space forming means can form a closed space in which the openings at the other axial end surfaces of the plurality of slots are blocked from the outside air. The pressing means can press the other axial end surface of the stator core by pressing the space forming means.

Further, when the stator supported by the inner peripheral communication closing means, the space forming means, and the pressing means is installed in the varnish storage container, no gas escape occurs when the pressure reducing means reduces the pressure in the closed space of the space forming means. Thus, the axial direction one end surface side of the stator core is closed. Specifically, the pressing member presses the other axial end surface of the stator core to eliminate a gap between the plurality of electromagnetic steel sheets, and the opening tip of the space forming unit is sealed to the other axial end surface of the stator core. And the tip of the opening of the varnish storage container is in close contact with one end surface in the axial direction of the stator core via a sealing material.
Thereby, the airtight state at the time of depressurization by the depressurizing means can be ensured, and one coil end portion protruding from one axial end surface of the stator core can be stably brought into contact with the varnish in the varnish storage container.

  Then, the closed space is depressurized by the depressurizing means, and evacuation is performed from the openings in the other axial end surfaces of the plurality of slots. At this time, the closed space is in a vacuum state, and the pressure in the closed space is lower than the liquid pressure of the varnish. Thereby, the attraction | suction force which osmose | permeates a varnish to the axial direction other end surface side of a stator core can be generated. In addition, since the entire gap between the electromagnetic steel sheets constituting the stator core is closed by receiving a pressing force by the pressing means, the suction force toward the other axial end surface side of the stator core is reduced to the gaps in the plurality of slots. Can only act on. Accordingly, it is possible to effectively promote the penetration of the varnish from the one coil end portion into the gaps in the plurality of slots and the surface of the coil. And the time which impregnates a varnish in a slot can be shortened. In particular, the varnish can be effectively infiltrated from one coil end portion to the other coil end portion in a plurality of slots, between the coil conductor wires, into a narrow gap between the conductor wires and the insulating paper.

In addition, as described above, the stator is stably supported on the varnish storage container by the inner peripheral communication blocking means, the space forming means, and the pressing means, thereby preventing the contact state of the varnish with the stator from becoming unstable. And varnish impregnation can be performed stably.
Therefore, according to the varnish impregnation device for a stator for a rotating electrical machine of the present invention, the stator can be stably supported and stable varnish impregnation can be performed in a short time.

A third aspect of the invention relates to a stator for a rotating electrical machine in which a coil is disposed in a plurality of slots in a stator core in which a plurality of electromagnetic steel plates are laminated in the axial direction. An apparatus for impregnating an insulating varnish,
A varnish storage container for storing the varnish;
From the inner peripheral side of the stator core, inner peripheral closing means for closing the entire gap between the plurality of electromagnetic steel sheets,
From the outer peripheral side of the stator core, outer periphery closing means for closing the entire gap between the plurality of electromagnetic steel sheets,
Pressurizing means for pressurizing the varnish stored in the varnish storage container toward one axial end surface of the stator core;
A space forming means for covering the opening at the other end surface in the axial direction of the plurality of slots and forming a closed space for blocking the opening from outside air;
Pressure reducing means for decompressing the closed space in the space forming means,
The space forming means has a container shape formed by forming a facing portion facing the other end surface in the axial direction of the stator core, and an outer peripheral arrangement portion standing in an annular shape from the facing portion and disposed on the outer peripheral side of the stator core. Frame,
The inner peripheral closing means is composed of a rubber tube that is in close contact with the inner peripheral surface of the stator core by inflating with gas inside.
The outer periphery closing means is constituted by an annular rubber tube that is held in the outer peripheral arrangement portion and is in close contact with the outer peripheral surface of the stator core by inflating with gas inside.
The inner peripheral blocking means and the outer peripheral blocking means close the entire gap between the plurality of electrical steel sheets, and form a state in which the openings at the one axial end surfaces of the plurality of slots are blocked from the outside air. After the stator is supported, the varnish in the varnish storage container is pressurized toward the one axial end surface of the stator core by the pressurizing means, whereby one of the coils protruding from the axial one end surface of the stator core. One coil end portion, which is a portion, is immersed in the varnish in the varnish storage container, and the varnish is removed from the openings in the axial end surfaces of the plurality of slots and the gaps in the plurality of slots and the coils. Configured to penetrate the surface,
When pressurizing the varnish in the varnish storage container by the pressurizing means, the varnish impregnation device for a stator for a rotating electrical machine is configured to decompress the closed space by the decompression means ( (Claim 2 )

The varnish impregnation device for a stator for a rotating electrical machine of the present invention forces the varnish from one coil end portion protruding from one end surface in the axial direction toward the other end side in the axial direction by pressurizing the varnish in the varnish storage container. The device is made to impregnate.
In the present invention, when the stator supported by the inner periphery closing means and the outer periphery closing means is installed in the varnish storage container, no varnish leakage occurs when the varnish storage container is pressurized by the pressurizing means. Thus, the axial direction one end surface side of the stator core is closed.

Specifically, the entire gap between the plurality of electromagnetic steel sheets is closed by the inner periphery closing means and the outer periphery closing means, and the space between the axial end face of the stator core and the opening tip of the varnish storage container is sealed, A state in which openings at one end faces in the axial direction of the plurality of slots are blocked from outside air (outside of the varnish storage container) is formed, and the stator is supported by the varnish storage container.
Thereby, when pressurizing the varnish by the pressurizing means, it is ensured that there is no varnish leakage from the gap between the plurality of electromagnetic steel sheets and between the one axial end surface side of the stator core and the varnish storage container. Can do.

  And the varnish in a varnish storage container is pressurized toward the axial direction one end surface of a stator core by a pressurization means. At this time, the varnish in the varnish storage container moves, and one coil end portion protruding from one axial end surface of the stator core is immersed in the varnish in the varnish storage container. In addition, the entire gap between the magnetic steel sheets constituting the stator core is closed by the inner peripheral closing means and the outer peripheral closing means, and the openings on the one end surface side in the axial direction of the plurality of slots are closed with the outside air. The pressure of the varnish toward the other axial end surface side of the stator core can be applied only to the gaps in the plurality of slots.

Thereby, the varnish can be effectively impregnated from the one coil end portion into the gaps in the plurality of slots and the surface of the coil. And the time which impregnates a varnish in a slot can be shortened. In particular, the varnish can be effectively impregnated from one coil end portion to the other coil end portion in a plurality of slots, between the coil conductor wires, into a narrow gap between the conductor wires and the insulating paper.
Therefore, according to the varnish impregnation device for a stator for a rotating electrical machine of the present invention, stable varnish impregnation can be performed in a short time by the pressure applied to the varnish.

A fourth aspect of the present invention relates to a stator for a rotating electrical machine in which a coil is disposed in a plurality of slots in a stator core in which a plurality of electromagnetic steel plates are laminated in the axial direction, and the gaps in the plurality of slots and the surfaces of the coils are An apparatus for impregnating an insulating varnish,
A varnish storage container for storing the varnish;
Inner circumferential communication closing means for closing the axial communication state of the stator core in the axial direction;
Pressurizing means for pressurizing the varnish stored in the varnish storage container toward one axial end surface of the stator core;
A pressing means for pressing the other axial end surface of the stator core toward the opening tip of the varnish storage container ;
A space forming means for covering the opening at the other end surface in the axial direction of the plurality of slots and forming a closed space for blocking the opening from outside air;
Pressure reducing means for decompressing the closed space in the space forming means,
The varnish storage container has its opening tip portion closely attached to an axial end surface of the stator core via a sealing material, and the openings at the axial end surfaces of the plurality of slots are blocked from outside air. Configured to form a state,
The space forming means has a facing portion opposed to the other axial end surface of the stator core, and an annular standing portion erected in an annular shape from the facing portion, and the annular tip portion of the annular standing portion is It is configured to form a state in which the stator core is in close contact with the other end surface in the axial direction via a sealing material,
The inner circumferential communication blocking means closes the axially connected state of the stator core in the axial direction, and the pressing means presses the other axial end surface of the stator core, thereby the plurality of electromagnetic waves constituting the stator core. After eliminating the gap between the steel plates and supporting the stator by forming a state in which the opening tip of the varnish storage container is in close contact with the one axial end surface of the stator core via a sealing material, By pressing the varnish in the varnish storage container toward the one axial end surface of the stator core by pressurizing means, one coil end portion that is a part of the coil protruding from the axial end surface of the stator core is While immersing in the varnish in the varnish storage container, the varnish from the opening in the axial end surface of the plurality of slots Serial Yes configured so as to penetrate into the gap and the surface of the coil in a plurality of slots,
When pressurizing the varnish in the varnish storage container by the pressurizing means, the varnish impregnation device for a stator for a rotating electrical machine is configured to decompress the closed space by the decompression means ( Claim 3 ).

The varnish impregnation device for a stator for a rotating electrical machine of the present invention also forces the varnish from one coil end portion protruding from one end surface in the axial direction toward the other end side in the axial direction by pressurizing the varnish in the varnish storage container. The device is made to impregnate.
The varnish impregnation apparatus of the present invention includes the varnish storage container, the inner peripheral communication closing means, and the pressing means, and can stably support the stator on the varnish storage container.

That is, in the present invention, by pressing the other axial end surface of the stator core by the pressing means, the stator core is sandwiched between the opening tip of the varnish storage container, and the gap between the plurality of electrical steel sheets constituting the stator core Can be eliminated. And by pressing with a press means, a stator can be stably supported to a varnish storage container.
Also, in the present invention, when the stator is installed in the varnish storage container, one end surface in the axial direction of the stator core is provided so that varnish leakage does not occur when the varnish in the varnish storage container is pressurized by the pressurizing means. Make the side closed.

Specifically, the entire gap between the plurality of electromagnetic steel sheets is closed by pressing with the pressing means, and the gap between the one axial end surface of the stator core and the opening tip of the varnish storage container is hermetically sealed. The stator is supported by the varnish storage container by forming a state in which the opening at one end surface in the axial direction of the slot is blocked from outside air (outside of the varnish storage container).
Thereby, when pressurizing the varnish by the pressurizing means, it is ensured that there is no varnish leakage from the gap between the plurality of electromagnetic steel sheets and between the one axial end surface side of the stator core and the varnish storage container. Can do.

  And the varnish in a varnish storage container is pressurized toward the axial direction one end surface of a stator core by a pressurization means. At this time, the varnish in the varnish storage container moves, and one coil end portion protruding from one axial end surface of the stator core is immersed in the varnish in the varnish storage container. Further, the entire gap between the magnetic steel sheets constituting the stator core is closed, and the openings on one axial end face side of the plurality of slots are closed with the outside air, so that the stator core toward the other axial end face side. The varnish pressure can be applied only to the gaps in the plurality of slots.

Thereby, the varnish can be effectively impregnated from the one coil end portion into the gaps in the plurality of slots and the surface of the coil. And the time which impregnates a varnish in a slot can be shortened. In particular, the varnish can be effectively impregnated from one coil end portion to the other coil end portion in a plurality of slots, between the coil conductor wires, into a narrow gap between the conductor wires and the insulating paper.
Therefore, the varnish impregnation device for a stator for a rotating electrical machine according to the present invention can perform stable varnish impregnation in a short time by the pressure applied to the varnish.

The fifth reference invention relates to a stator for a rotating electrical machine in which coils are arranged in a plurality of slots in a stator core in which a plurality of electromagnetic steel plates are laminated in the axial direction, on the gaps in the plurality of slots and on the surfaces of the coils. A method of impregnating an insulating varnish,
A varnish storage container for storing varnish, an inner peripheral blocking means for closing the entire gap between the plurality of electromagnetic steel sheets from the inner peripheral side of the stator core, and a plurality of the electromagnetic steel sheets from the outer peripheral side of the stator core An outer periphery closing means that closes the entire gap between the plurality of slots, and a space forming means that covers the opening at the other end surface in the axial direction of the plurality of slots and forms a closing space that blocks the opening from outside air,
The space forming means has a container shape formed by forming a facing portion facing the other end surface in the axial direction of the stator core, and an outer peripheral arrangement portion standing in an annular shape from the facing portion and disposed on the outer peripheral side of the stator core. The inner periphery closing means is constituted by a rubber tube which is in close contact with the inner peripheral surface of the stator core by inflating with gas inside, and the outer periphery closing means is held by the outer peripheral arrangement portion, It is composed of an annular rubber tube that is in close contact with the outer peripheral surface of the stator core by inflating with a gas,
One of the coil end portions that is a part of the coil protruding from one end surface in the axial direction of the stator core by closing the entire gap between the plurality of electromagnetic steel sheets by the inner peripheral closing means and the outer peripheral closing means, The state in which the openings in the axial end surfaces of the plurality of slots are blocked from outside air, or the axial end surfaces of the one coil end portion and the stator core are in contact with the varnish in the varnish storage container. A stator supporting step of supporting the stator by immersing it in a varnish in a varnish storage container, forming a state in which openings in the axial end faces of the plurality of slots are opened in the varnish in the varnish storage container; ,
By depressurizing the enclosed space and making the pressure in the enclosed space lower than the hydraulic pressure of the varnish, the varnish penetrates from the one coil end portion into the gaps in the plurality of slots and the surface of the coil. And a varnish impregnation step for promoting the varnish .

The method for impregnating a stator for a rotating electrical machine according to the present invention can obtain the same effects as those of the first invention by performing the stator support step and the varnish impregnation step.
Therefore, according to the method for impregnating a stator for a rotating electrical machine of the present invention, the stator can be stably supported, and stable varnish impregnation can be performed in a short time.

A sixth invention provides a stator for a rotating electrical machine in which a coil is disposed in a plurality of slots in a stator core in which a plurality of electromagnetic steel plates are laminated in the axial direction. A method of impregnating an insulating varnish,
Covering a varnish storage container for storing varnish, inner peripheral communication closing means for closing an axial communication state on the inner peripheral side of the stator core, and openings in the other axial end surfaces of the plurality of slots, Using a space forming means for forming a closed space that blocks the opening from outside air,
The varnish storage container has its opening tip portion closely attached to an axial end surface of the stator core via a sealing material, and the openings at the axial end surfaces of the plurality of slots are blocked from outside air. The space forming means is configured to form a state in which the opening tip is closely attached to the other axial end surface of the stator core via a sealing material,
The inner peripheral communication blocking means closes the axially connected state of the stator core in the axial direction, and one coil end portion that is a part of the coil protruding from one axial end surface of the stator core is connected to the varnish. By contacting the varnish in the storage container and pressing the other axial end surface of the stator core, the gap between the plurality of electromagnetic steel sheets constituting the stator core is eliminated, and the opening tip of the space forming means Is formed in close contact with the other axial end surface of the stator core via a sealing material, and the opening tip of the varnish storage container is closely adhered to one axial end surface of the stator core via the sealing material. A stator support step for supporting the stator;
By depressurizing the enclosed space and making the pressure in the enclosed space lower than the hydraulic pressure of the varnish, the varnish penetrates from the one coil end portion into the gaps in the plurality of slots and the surface of the coil. in varnish impregnation method of a rotating electric machine stator, which comprises a varnish impregnation step to promote (claim 4).

The method for impregnating a stator for a rotating electrical machine of the present invention can obtain the same effects as those of the second invention by performing the stator support step and the varnish impregnation step.
Therefore, according to the method for impregnating a stator for a rotating electrical machine of the present invention, the stator can be stably supported, and stable varnish impregnation can be performed in a short time.

The seventh reference invention relates to a stator for a rotating electrical machine in which coils are arranged in a plurality of slots in a stator core in which a plurality of electromagnetic steel plates are laminated in the axial direction, and the gaps in the plurality of slots and the surfaces of the coils are provided. A method of impregnating an insulating varnish,
A varnish storage container for storing varnish, an inner peripheral blocking means for closing the entire gap between the plurality of electromagnetic steel sheets from the inner peripheral side of the stator core, and a plurality of the electromagnetic steel sheets from the outer peripheral side of the stator core And the outer periphery closing means for closing the entire gap between
The inner peripheral blocking means and the outer peripheral blocking means close the entire gap between the plurality of electrical steel sheets, and form a state in which the openings at the one axial end surfaces of the plurality of slots are blocked from the outside air. A stator support step for supporting the stator;
By pressing the varnish in the varnish storage container toward the axial end surface of the stator core, one coil end portion that is a part of the coil protruding from the axial end surface of the stator core is moved to the varnish storage container. A varnish impregnation step of immersing the varnish into the gaps in the plurality of slots and the surfaces of the coils from the openings in the axial end surfaces of the plurality of slots. And a varnish impregnation method for a stator for a rotating electrical machine .

The varnish impregnation method for a stator for a rotating electrical machine according to the present invention can obtain the same effects as the third invention by performing the stator support step and the varnish impregnation step.
Therefore, according to the varnish impregnation method for a stator for a rotating electrical machine of the present invention, stable varnish impregnation can be performed in a short time by the pressure applied to the varnish.

The eighth invention relates to a stator for a rotating electrical machine in which coils are disposed in a plurality of slots in a stator core in which a plurality of electromagnetic steel plates are laminated in the axial direction, and the gaps in the plurality of slots and the surfaces of the coils are A method of impregnating an insulating varnish,
Covering a varnish storage container for storing varnish, inner peripheral communication closing means for closing an axial communication state on the inner peripheral side of the stator core, and openings in the other axial end surfaces of the plurality of slots, Using a space forming means for forming a closed space that blocks the opening from outside air,
The varnish storage container has its opening tip portion closely attached to an axial end surface of the stator core via a sealing material, and the openings at the axial end surfaces of the plurality of slots are blocked from outside air. The space forming means is configured to form a state in which the opening tip is closely attached to the other axial end surface of the stator core via a sealing material,
The inner circumferential communication blocking means closes the axially connected state of the stator core in the axial direction, and the pressing means presses the other axial end surface of the stator core, thereby the plurality of electromagnetic waves constituting the stator core. The gap between the steel plates is eliminated, the opening tip of the space forming means is brought into close contact with the other axial end surface of the stator core via a sealing material, and the opening tip of the varnish storage container is axially connected to the stator core. A stator support step for supporting the stator by forming a state of being in close contact with the one end surface via a sealing material;
One coil end portion which is a part of the coil protruding from one axial end surface of the stator core by pressurizing the varnish in the varnish storage container toward the axial one end surface of the stator core by the pressurizing means A varnish impregnation step of immersing the varnish into the gaps in the plurality of slots and the surfaces of the coils from the openings in the one axial end surfaces of the plurality of slots. in varnish impregnation method of a rotating electric machine stator, which comprises a (claim 5).

In the method for impregnating a stator for a rotating electrical machine of the present invention, the same effect as the fourth aspect of the invention can be obtained by performing the stator support step and the varnish impregnation step.
Therefore, according to the varnish impregnation method for a stator for a rotating electrical machine of the present invention, stable varnish impregnation can be performed in a short time by the pressure applied to the varnish.

Cross-sectional explanatory drawing which shows the varnish impregnation apparatus of the stator for rotary electric machines in a reference example . Sectional explanatory drawing which shows the cross section of the direction orthogonal to the axial direction of a stator about the varnish impregnation apparatus in a reference example . Cross-sectional explanatory drawing which shows the varnish impregnation apparatus of the stator for other rotary electric machines in a reference example . Sectional explanatory drawing which shows the state which attached the stator in the frame of a rotary electric machine in a reference example . Sectional explanatory drawing which shows the varnish impregnation apparatus of the stator for rotary electric machines in Example 1. FIG. Cross-sectional explanatory drawing which shows the varnish impregnation apparatus of the stator for other rotary electric machines in Example 1 before pressure reduction. Sectional explanatory drawing which shows the varnish impregnation apparatus of the stator for other rotary electric machines at the time of pressure reduction in Example 1. FIG. Sectional explanatory drawing which shows the varnish impregnation apparatus of the stator for rotary electric machines in Example 2 before the pressurization. Sectional explanatory drawing which shows the varnish impregnation apparatus of the stator for rotary electric machines at the time of pressurization in Example 2. FIG. Cross-sectional explanatory drawing which shows the varnish impregnation apparatus of the stator for other rotary electric machines in Example 2 before pressurization and pressure reduction. Sectional explanatory drawing which shows the varnish impregnation apparatus of the stator for other rotary electric machines at the time of pressurization and pressure reduction in Example 2. FIG. Sectional explanatory drawing which shows the varnish impregnation apparatus of the stator for rotary electric machines in Example 3 before a pressurization. Sectional explanatory drawing which shows the varnish impregnation apparatus of the stator for rotary electric machines at the time of pressurization in Example 3. FIG.

A preferred embodiment in the first to eighth inventions described above will be described.
In the first, second, fifth and sixth inventions, the liquid pressure of the varnish means a pressure state applied to the varnish, and is usually the same pressure as the atmospheric pressure.
The stator for a rotating electrical machine can be used for a motor, a generator, and a motor generator.

3rd invention WHEREIN: The said varnish impregnation apparatus covers the opening part in the said axial direction other end surface of these slots, The space formation means which forms the obstruction | occlusion space which interrupts | blocks this opening part with external air, This space formation Pressure reducing means for decompressing the closed space in the means, wherein the space forming means is opposed to the other end surface in the axial direction of the stator core, and is arranged in an annular form from the facing part so as to form the stator core. The inner peripheral block means is formed from a rubber tube that is in close contact with the inner peripheral surface of the stator core by inflating with gas inside. The outer periphery closing means is an annular rubber that is held in the outer peripheral arrangement portion and is in close contact with the outer peripheral surface of the stator core by inflating with gas inside. Yes constructed from cube, when pressurizing the varnish of the varnish storage container by the pressure means, are configured to vacuum the closed space by said vacuum means.
Thus, by using the pressurizing means and the decompression means in combination, the pressure difference between the one axial end surface side and the other axial end surface side of the stator core can be further increased, and a plurality of slots can be formed from one coil end portion. It is possible to more effectively impregnate the inner gap and the surface of the coil with the varnish.

Further, in a fourth invention, the varnish impregnation device comprises a space forming means for covering the openings at the other end face in the axial direction of the plurality of slots and forming a closed space for blocking the openings from the outside air, A pressure reducing means for decompressing the closed space in the space forming means, the space forming means having a facing portion opposed to the other axial end surface of the stator core, and an annularly erected from the facing portion. And is configured to form a state in which the annular tip portion of the annular standing portion is in close contact with the other axial end surface of the stator core via a sealing material, When pressurizing the varnish in the varnish storage container, the closed space is decompressed by the decompression means .
Thus, by using the pressurizing means and the decompression means in combination, the pressure difference between the one axial end surface side and the other axial end surface side of the stator core can be further increased, and a plurality of slots can be formed from one coil end portion. It is possible to more effectively impregnate the inner gap and the surface of the coil with the varnish.

Embodiments of a varnish impregnation device and a varnish impregnation method for a stator for a rotating electrical machine according to the present invention will be described below with reference to the drawings.
( Reference example )
As shown in FIG. 1, the varnish impregnation device 1 for the stator 7 for a rotating electrical machine of this example is a rotation in which coils 71 are arranged in a plurality of slots 82 in a stator core 8 in which a plurality of electromagnetic steel plates 81 are laminated in the axial direction L. The electric stator 7 is impregnated with the insulating varnish W in the gaps in the plurality of slots 82 and the surfaces of the coils 71.
As shown in FIGS. 1 and 2, the varnish impregnation apparatus 1 of the present example is configured to clean the entire gap between the plurality of electromagnetic steel plates 81 from the varnish storage container 2 that stores the varnish W and the inner peripheral side of the stator core 8. The inner peripheral closing means 3 for closing, the outer peripheral closing means 4 for closing the entire gap between the plurality of electromagnetic steel plates 81 from the outer peripheral side of the stator core 8, and the opening 821 in the other axial end surface 802 of the plurality of slots 82. A space forming unit 5 that covers and forms the closed space 50 that blocks the opening 821 from outside air, and a decompression unit 61 that decompresses the closed space 50 in the space forming unit 5 are provided.

  The space forming means 5 of this example forms a facing portion 51 that faces the other end surface 802 in the axial direction of the stator core 8, and an outer peripheral placement portion 52 that stands in a ring shape from the facing portion 51 and is disposed on the outer peripheral side of the stator core 8. This is a vessel-shaped frame. The inner periphery closing means 3 of this example is composed of a rubber tube that is brought into close contact with the inner peripheral surface of the stator core 8 by inflating with air A inside. It is comprised from the annular | circular shaped rubber tube which is hold | maintained at 52 and is closely_contact | adhered to the outer peripheral surface of the stator core 8 by putting air A inside and expanding it.

In the varnish impregnation device 1 of the stator 7 for the rotating electrical machine of this example, the entire gap between the plurality of electromagnetic steel plates 81 is closed by the inner periphery closing means 3 and the outer periphery closing means 4, and the axial end surface 801 of the stator core 8 is closed. One end portion 711 which is a part of the coil 71 protruding from the varnish storage container 2 is brought into contact with the varnish W, and the openings 821 in the axial end faces 801 of the plurality of slots 82 are exposed to the outside air (varnish storage). The stator 7 is supported by forming a state in which it is shut off from the atmosphere outside the container 2.
Thereafter, the closed space 50 is depressurized by the pressure reducing means 61, and the pressure in the closed space 50 is made lower than the hydraulic pressure (atmospheric pressure) of the varnish W, whereby the gaps in the plurality of slots 82 from one coil end portion 711. And the penetration of the varnish W into the surface of the coil 71 is promoted.

Below, the varnish impregnation apparatus 1 and the varnish impregnation method of the stator 7 for rotary electric machines of this example are explained in detail with reference to FIGS.
As shown in FIG. 2, the stator 7 of this example is configured by arranging a three-phase coil 71 through a plurality of slots 82 with insulating paper 72 interposed therebetween. The conducting wire 710 constituting the coil 71 is formed by forming an insulating film made of a resin material or the like on the surface of a conductor portion made of a copper material or the like. The varnish W impregnated by the varnish impregnation apparatus 1 is a gap between the magnetic steel plates 81 from the inside of the slot 82, a gap between the insulating paper 72 and the conductor 710 constituting the coil 71, and a gap between the insulating paper 72 and the slot 82. The surface of the conducting wire 710 constituting the gap end, the gap between the conducting wires 710 constituting the coil 71, and the coil end portions 711 and 712 at both ends in the axial direction L is impregnated.

  As shown in FIG. 1, the stator 7 of this example supports the varnish storage container 2 with its axial direction L oriented in the vertical direction. And the one coil end part 711 is made to contact varnish W by immersing the annular front-end | tip part 521 in the outer periphery arrangement | positioning part 52 of the container-shaped frame which comprises the space formation means 5 in the varnish W in the varnish storage container 2. FIG. In this state, the openings 821 in the axial end surfaces 801 of the plurality of slots 82 are blocked from the outside air. At this time, although the space 20 is formed between the axial end surface 801 of the stator core 8 and the liquid level of the varnish W in the varnish storage container 2, the space 20 is blocked from the outside air. . Thereby, it is possible to prevent the closed space 50 from being opened to the outside on the axial one end face 801 side of the stator core 8, and maintain the degree of vacuum of the closed space 50.

The inner periphery closing means 3 of this example is an air picker configured to be inflated by putting air A in a rubber tube. The inner periphery closing means 3 expands so that the cross section perpendicular to the axial direction L is circular. The inner periphery closing means 3 is in contact with the teeth 83 between the slots 82 of the stator core 8 and closes the gap between the electromagnetic steel plates 81 and the radial opening of the slot 82 from the inner periphery side.
The outer periphery closing means 4 of this example is an air picker configured to expand with air A in a rubber tube. The outer periphery closing means 4 expands so that the cross section orthogonal to the axial direction L has an annular shape. And the outer periphery obstruction | occlusion means 4 contact | abuts to the outer peripheral surface of the stator core 8, and closes the clearance gap between the electromagnetic steel plates 81 from an inner peripheral side.
The decompression means 61 of this example is a vacuum pump that evacuates the closed space 50.

Next, a method for impregnating the stator 7 with the varnish W using the varnish impregnation apparatus 1 will be described.
In performing impregnation of the varnish W with respect to the stator 7, first, the stator 7 is supported with respect to the varnish storage container 2 as a stator support process. Specifically, as shown in FIG. 1, first, the entire gap between the plurality of electromagnetic steel plates 81 is closed from the inner peripheral side and the outer peripheral side of the stator core 8 by the inner peripheral closing unit 3 and the outer peripheral closing unit 4. Further, the annular tip 521 in the outer peripheral arrangement portion 52 of the vessel-shaped frame 5 is immersed in the varnish W in the varnish storage container 2, and the annular tip 521 is placed on the bottom of the varnish storage container 2 to reduce the pressure. When the pressure in the closed space 50 is reduced by the means 61, air is prevented from being released from the axial one end face 801 side of the stator core 8. The stator 7 can be stably supported with respect to the varnish storage container 2 by the inner periphery closing means 3, the outer periphery closing means 4, and the instrumental frame 5. In addition, the one coil end portion 711 protruding from the axial end surface 801 of the stator core 8 can be stably brought into contact with the varnish W in the varnish storage container 2.

  Next, as shown in FIG. 1, as the varnish impregnation step, the closed space 50 in the container frame 5 is depressurized (evacuated) by the decompression means 61, and the openings 821 to the slots 82 in the other axial end surfaces 802 of the plurality of slots 82. The inside gap is evacuated. At this time, the closed space 50 is in a vacuum state, and the pressure in the closed space 50 becomes lower than the hydraulic pressure (atmospheric pressure) of the varnish W. As a result, it is possible to generate a suction force that allows the varnish W to permeate toward the other axial end surface 802 side of the stator core 8.

  Further, since the entire gap between the electromagnetic steel plates 81 constituting the stator core 8 is closed by the inner peripheral closing means 3 and the outer peripheral closing means 4, the attractive force toward the other axial end surface 802 side of the stator core 8 is increased. It is possible to act only on the gaps in the plurality of slots 82. Accordingly, it is possible to effectively promote the penetration of the varnish W from the one coil end portion 711 into the gaps in the plurality of slots 82 and the surface of the coil 71. The time for impregnating the varnish W into the slot 82 can be shortened. In particular, as shown in FIG. 2, from one coil end portion 711 to the other coil end portion 712, into a narrow gap between the conductor wires 710 of the coil 71 and between the conductor wire 710 and the insulating paper 72 in the plurality of slots 82. The varnish W can be infiltrated effectively.

Further, as described above, the stator 7 is stably supported on the varnish storage container 2 by the inner peripheral closing means 3, the outer peripheral closing means 4, and the instrumental frame 5, so that the contact state of the varnish W with the stator 7 becomes unstable. It is possible to prevent the varnish W from being impregnated stably.
Therefore, according to the varnish impregnation device 1 and the varnish impregnation method of the stator 7 for the rotating electrical machine of this example, the stator 7 can be stably supported, and the varnish W can be stably impregnated in a short time. .

In addition, in order to block the opening 821 on the axial end surface 801 side of the plurality of slots 82 from the outside air, the annular tip 521 in the outer peripheral arrangement portion 52 of the vessel-like frame 5 is used as the varnish W in the varnish storage container 2. In addition to adopting a dipping structure, the following structure can be adopted.
That is, as shown in FIG. 3, the one axial end surface 801 of one coil end portion 711 and the stator core 8 is immersed in the varnish W in the varnish storage container 2, and the openings 821 in the axial one end surfaces 801 of the plurality of slots 82. Is also opened in the varnish W in the varnish storage container 2, the openings 821 on the axial one end face 801 side of the plurality of slots 82 can be blocked from outside air.

  In this case, a mounting portion 84 (a portion provided with a hole protruding through the outer periphery of the stator core 8 and through which the bolt 76 is inserted) on the axial end surface 801 of the stator core 8 is covered with a masking tape or the like. be able to. Further, as shown in FIG. 4, the axial one end surface 801 side immersed in the varnish W is the side on which the head of the bolt 76 faces when the stator 7 is attached to the frame 75 of the rotating electrical machine (attachment surface to the frame 75. 841). Thereby, the other axial end surface 802 in the stator core 8 where no varnish W adheres can be conducted to the frame 75, the contact state between the other axial end surface 802 and the mounting surface 841 is stabilized, and the torque reaction force is increased. I can receive it reliably. Furthermore, after the impregnation of the varnish W is finished, the work of peeling off the varnish W adhering to the axial end surface 801 can be eliminated.

(Example 1 )
This example is an example in which the structure for supporting the stator 7 with respect to the varnish storage container 2 is different from that of the first embodiment.
As shown in FIG. 5, the varnish impregnation device 1 for the rotating electrical machine stator 7 of the present example closes the varnish storage container 2 that stores the varnish W and the communication state in the axial direction L on the inner peripheral side of the stator core 8. The space communication means 3, the space forming means 5 that covers the opening 821 in the other axial end surface 802 of the plurality of slots 82 and forms a closed space 50 that blocks the opening 821 from the outside air, and the space forming means 5 The pressure reducing means 61 for reducing the pressure in the closed space 50 and the pressing means 63 for pressing the other axial end surface 802 of the stator core 8 toward the opening tip 21 of the varnish storage container 2 are provided.

  In the varnish storage container 2 of this example, the opening tip 21 is brought into close contact with the axial one end surface 801 of the stator core 8 via a sealing material 211 (packing, gasket, etc.), and the axial direction of the plurality of slots 82 is reached. The opening 821 in the one end surface 801 is configured to be blocked from the outside air (such as the atmosphere outside the varnish storage container 2). The space forming means 5 of this example is configured to form a state in which the annular tip 521 is brought into close contact with the other axial end surface 802 of the stator core 8 via a sealing material 522 (packing, gasket, etc.).

The inner periphery communication blocking means 3 of this example is configured by an air picker similar to the above reference example . The space forming means 5 of this example is constituted by a container-like frame 5 provided with a facing portion 51 that faces the other axial end surface 802 of the stator core 8 and an annular standing portion 52A that stands in a ring shape from the facing portion 51. The annular tip portion 521 of the annular standing portion 52A is configured to be in close contact with the other axial end surface 802 of the stator core 8 via the sealing material 522.
The pressing means 63 of this example is configured to compress the laminated state of the plurality of electromagnetic steel plates 81 by pressing the space forming means 5.

Also in this example, the varnish W is impregnated into the stator 7 using the varnish impregnation apparatus 1.
Also in this example, first, the stator 7 is supported with respect to the varnish storage container 2 as a stator support process. Specifically, as shown in FIG. 5, one coil protruding from the axial one end face 801 of the stator core 8 is closed by the inner peripheral communication closing means 3 to block the communication state in the axial direction L on the inner peripheral side of the stator core 8. The end part 711 is brought into contact with the varnish W in the varnish storage container 2. Further, the pressing means 63 presses the other axial end surface 802 of the stator core 8 through the space forming means 5, thereby eliminating gaps between the plurality of electromagnetic steel plates 81 constituting the stator core 8. The annular tip 521 of the annular standing portion 52A is brought into close contact with the other axial end surface 802 of the stator core 8 via the sealing material 522, and the open distal end portion 21 of the varnish storage container 2 is attached to the axial one end surface 801 of the stator core 8. A state of being in close contact via the sealing material 211 is formed.

  Thereby, when decompressing the closed space 50 by the decompression means 61, air is prevented from being released from the axial one end face 801 side of the stator core 8. The stator 7 can be stably supported with respect to the varnish storage container 2 by the inner peripheral communication closing means 3, the container frame 5 and the pressing means 63. In addition, the one coil end portion 711 protruding from the axial end surface 801 of the stator core 8 can be stably brought into contact with the varnish W in the varnish storage container 2.

  Next, as shown in FIG. 5, as the varnish impregnation step, the closed space 50 in the container frame 5 is decompressed (evacuated) by the decompression means 61, and the openings 821 to the slots 82 in the other axial end surfaces 802 of the plurality of slots 82. The inside gap is evacuated. At this time, the closed space 50 is in a vacuum state, and the pressure in the closed space 50 becomes lower than the hydraulic pressure (atmospheric pressure) of the varnish W. As a result, it is possible to generate a suction force that allows the varnish W to permeate toward the other axial end surface 802 side of the stator core 8.

In addition, the entire gap between the electromagnetic steel plates 81 constituting the stator core 8 is closed by the inner peripheral communication closing means 3 and the pressing means 63, and the axial one end face 801 side of the plurality of slots 82, the axial direction, etc. Since the end surface 802 side is blocked from the outside air, the suction force toward the other axial end surface 802 side of the stator core 8 can be applied only to the gaps in the plurality of slots 82. Accordingly, it is possible to effectively promote the penetration of the varnish W from the one coil end portion 711 into the gaps in the plurality of slots 82 and the surface of the coil 71. The time for impregnating the varnish W into the slot 82 can be shortened.
In this embodiment, other configurations are the same as the reference example, it is possible to obtain the same effect as the above embodiment.

  Further, as shown in FIG. 6, the varnish storage container 2 includes a facing container part 22 that faces the one axial end surface 801 of the stator 7 and an auxiliary container part 23 that communicates with the facing container part 22 through the communication path 24. It can comprise in the shape which has. Since the axial end surfaces 801 of the plurality of slots 82 are shielded from the outside air, when the closed space 50 is evacuated by the decompression means 61, the axial end surfaces of the stator core 8 are shown in FIG. The space 20 (see FIG. 6) between the surface 801 and the liquid level of the varnish W is also evacuated, the varnish W in the auxiliary container portion 23 moves into the facing container portion 22, and one coil end portion 711 is moved to the varnish W. It can be immersed in the inside. Further, the varnish W can be brought into contact with the one axial end surface 801 of the stator core 8. And the varnish W can be supplied to the clearance gap in the slot 82 from the axial direction one end surface 801 side of the some slot 82. FIG.

(Example 2 )
This example is an example of effectively impregnating the stator 7 with the varnish W using the pressurizing means 62 instead of using the decompression means 61.
As shown in FIG. 8, the varnish impregnation device 1 for the stator 7 for a rotating electrical machine of this example has a gap between the varnish storage container 2 for storing the varnish W and a plurality of electromagnetic steel plates 81 from the inner peripheral side of the stator core 8. The inner periphery closing means 3 that closes the whole, the outer periphery closing means 4 that closes the entire gap between the plurality of electromagnetic steel plates 81 from the outer peripheral side of the stator core 8, and the varnish W that is stored in the varnish storage container 2. And pressurizing means 62 for pressurizing toward the one axial end face 801 of the axial direction.

  The varnish storage container 2 of this example includes a facing container part 22 that faces one end surface 801 in the axial direction of the stator 7 and a pressurized container part 23 that communicates with the facing container part 22 via a communication path 24. Has been. Then, the pressurizing unit 62 pressurizes the varnish W in the pressurizing container portion 23 toward the facing container portion 22 by sending the pressurized air B into the pressurizing container portion 23, thereby causing a plurality of slots 82. The varnish W can be supplied to the gap in the slot 82 from the axial end surface 801 side.

The inner periphery closing means 3 and the outer periphery closing means 4 of this example are the same as the air picker shown in the reference example . The outer peripheral closing means 4 is held on the inner peripheral side of a cylindrical frame 55 disposed on the outer peripheral side of the stator core 8. A flange portion 552 is formed at the opening front end portion 551 of the cylindrical frame 55. The sealing material 211 is disposed between the flange portion 552 and the opening tip portion 21 of the varnish storage container 2, and the cylindrical frame 55 is fixed to the varnish storage container 2, whereby the plurality of slots 82 are aligned in the axial direction. The end surface 801 side is shielded from outside air.

Also in this example, the varnish W is impregnated into the stator 7 using the varnish impregnation apparatus 1.
Also in this example, first, the stator 7 is supported with respect to the varnish storage container 2 as a stator support process. Specifically, as shown in FIG. 8, the entire gap between the plurality of electromagnetic steel plates 81 is closed from the inner peripheral side and the outer peripheral side by the inner peripheral closing means 3 and the outer peripheral closing means 4. In addition, by fixing the cylindrical frame 55 to the varnish storage container 2 via the sealing material 552, the axial one end face 801 side of the plurality of slots 82 is blocked from outside air. Accordingly, when the varnish W is pressurized by the pressurizing means 62, the varnish W is formed from the gaps between the plurality of electromagnetic steel plates 81 and between the axial one end face 801 side of the stator core 8 and the varnish storage container 2. There can be no leakage. The stator 7 is supported with respect to the varnish storage container 2 by the inner periphery closing means 3, the outer periphery closing means 4 and the cylindrical frame 55.

  Next, as a varnish impregnation step, as shown in FIG. 9, the varnish W in the varnish storage container 2 is pressurized toward the axial one end surface 801 of the stator core 8 by the pressurizing means 62. At this time, the varnish W in the varnish storage container 2 moves, and one coil end portion 711 protruding from the axial end surface 801 of the stator core 8 is immersed in the varnish W in the varnish storage container 2. Further, the entire gap between the electromagnetic steel plates 81 constituting the stator core 8 is closed by the inner peripheral closing means 3 and the outer peripheral closing means 4, and the openings 821 on the axial one end face 801 side of the plurality of slots 82 are outside air. Thus, the pressure of the varnish W toward the other axial end surface 802 side of the stator core 8 can be applied only to the gaps in the plurality of slots 82.

As a result, the varnish W can be forcibly impregnated from one coil end portion 711 into the gaps in the plurality of slots 82 and the surface of the coil 71. The time for impregnating the varnish W into the slot 82 can be shortened. In particular, the varnish W is effective from one coil end portion 711 to the other coil end portion 712 in a narrow gap between the conductor wires 710 of the coil 71 and between the conductor wire 710 and the insulating paper 72 in the plurality of slots 82. Can be impregnated (see FIG. 2).
Therefore, according to the varnish impregnation apparatus 1 and the varnish impregnation method of the stator 7 for a rotating electrical machine of this example, the varnish W can be stably impregnated in a short time by the pressure applied to the varnish W.
In this embodiment, other configurations are the same as the reference example, it is possible to obtain the same effect as the above embodiment.

Moreover, the varnish impregnation apparatus 1 of this example can use together the pressure reduction means 61 shown in the said reference example , as shown in FIG. In the varnish impregnation step, when the varnish W in the varnish storage container 2 is pressurized by the pressurizing means 62, the closed space 50 is decompressed by the decompression means 61.
In this case, as shown in FIG. 11, the pressure difference between the axial one end face 801 side and the axial other end face 802 side of the stator core 8 is further increased by using the pressurizing means 62 and the decompressing means 61 together. In addition, the impregnation of the varnish W into the gaps in the plurality of slots 82 and the surface of the coil 71 from one coil end portion 711 can be more effectively performed.

(Example 3 )
This example is also an example in which the stator 7 is effectively impregnated with the varnish W by using the pressurizing unit 62 instead of using the decompression unit 61.
As shown in FIG. 12, the varnish impregnation device 1 for the stator 7 for a rotating electrical machine in this example closes the varnish storage container 2 that stores the varnish W and the communication state in the axial direction L on the inner peripheral side of the stator core 8. The circumferential communication closing means 3, the pressurizing means 62 that pressurizes the varnish W stored in the varnish storage container 2 toward the one axial end face 801 of the stator core 8, and the axial other end face 802 of the stator core 8 are connected to the varnish storage container. 2 and pressing means 63 for pressing toward the opening tip 21.

In the varnish storage container 2 of this example, the opening tip 21 is brought into close contact with the axial one end surface 801 of the stator core 8 via the sealing material 211, and the openings in the axial one end surfaces 801 of the plurality of slots 82 are provided. It is configured to form a state in which 821 is shut off from the outside air (such as the atmosphere outside the varnish storage container 2).
The varnish storage container 2 of this example is configured to have a facing container part 22, a pressurized container part 23, and a communication path 24 as in the second embodiment. The inner periphery communication blocking means 3 of this example is the same as the air picker shown in the above reference example . The pressurizing means 62 in this example is the same as that in the second embodiment.

Also in this example, the varnish W is impregnated into the stator 7 using the varnish impregnation apparatus 1.
Also in this example, first, as shown in FIG. 12, the stator 7 is supported with respect to the varnish storage container 2 as a stator support process. Specifically, the communication state in the axial direction L on the inner peripheral side of the stator core 8 is closed by the inner peripheral communication closing means 3, and the other axial end surface 802 of the stator core 8 is pressed by the pressing means 63. Is formed, and the opening tip 21 of the varnish storage container 2 is in close contact with the axial one end face 801 of the stator core 8 via the sealing material 211. . Accordingly, when the varnish W is pressurized by the pressurizing means 62, the varnish W is formed from the gaps between the plurality of electromagnetic steel plates 81 and between the axial one end face 801 side of the stator core 8 and the varnish storage container 2. There can be no leakage. Then, the stator 7 is pressed against the varnish storage container 2 by the pressing means 63 so that the stator 7 is supported by the varnish storage container 2.

  Next, as a varnish impregnation step, as shown in FIG. 13, the varnish W in the varnish storage container 2 is pressurized toward the axial one end surface 801 of the stator core 8 by the pressurizing means 62. At this time, the varnish W in the varnish storage container 2 moves, and one coil end portion 711 protruding from the axial end surface 801 of the stator core 8 is immersed in the varnish W in the varnish storage container 2. Further, the entire gap between the electromagnetic steel plates 81 constituting the stator core 8 is closed, and the openings 821 on the axial one end face 801 side of the plurality of slots 82 are closed with the outside air. The pressure of the varnish W toward the other axial end surface 802 can be applied only to the gaps in the plurality of slots 82.

Also with the varnish impregnation device 1 for the stator 7 for a rotating electrical machine of this example, the varnish W can be stably impregnated in a short time by the pressure applied to the varnish W as in the second embodiment.
In this example, the other configuration is the same as the second embodiment, it is possible to obtain the same effects as the second embodiment.
Moreover, also in the varnish impregnation apparatus 1 of this example, the pressurization means 62 and the pressure reduction means 61 can be used together similarly to the said Example 2. FIG.

DESCRIPTION OF SYMBOLS 1 Varnish impregnation apparatus 2 Varnish storage container 21 Opening front-end | tip part 3 Inner periphery obstruction | occlusion means 4 Outer periphery obstruction | occlusion means 5 Space formation means (instrument frame)
DESCRIPTION OF SYMBOLS 50 Closed space 51 Opposite part 52 Outer periphery arrangement | positioning part 55 Cylindrical frame 61 Depressurization means 62 Pressurization means 63 Pressing means 7 Stator for rotary electric machines 71 Coil 711 One coil end part 712 The other coil end part 8 Stator core 801 One end surface of axial direction 802 Other end surface in the axial direction 81 Magnetic steel sheet 82 Slot L Axial direction W Varnish

Claims (5)

For a stator for a rotating electrical machine in which coils are arranged in a plurality of slots in a stator core in which a plurality of electromagnetic steel sheets are laminated in the axial direction, an insulating varnish is impregnated in the gaps in the plurality of slots and the surfaces of the coils. A device for causing
  A varnish storage container for storing the varnish;
  Inner circumferential communication closing means for closing the axial communication state of the stator core in the axial direction;
  A space forming means for covering the opening at the other end surface in the axial direction of the plurality of slots and forming a closed space for blocking the opening from outside air;
  Decompression means for decompressing the closed space in the space forming means;
  A pressing means for pressing the other axial end surface of the stator core toward the opening tip of the varnish storage container;
  The varnish storage container has its opening tip portion closely attached to an axial end surface of the stator core via a sealing material, and the openings at the axial end surfaces of the plurality of slots are blocked from outside air. Configured to form a state,
  The space forming means is configured to form a state in which the opening tip is in close contact with the other axial end surface of the stator core via a sealing material,
  The inner peripheral communication blocking means closes the axially connected state of the stator core in the axial direction, and one coil end portion that is a part of the coil protruding from one axial end surface of the stator core is connected to the varnish. By contacting the varnish in the storage container and pressing the other axial end surface of the stator core by the pressing means, the gap between the plurality of electrical steel sheets constituting the stator core is eliminated, and the space forming means The opening tip of the stator core is in close contact with the other axial end surface of the stator core via a sealing material, and the opening tip of the varnish storage container is in close contact with the one axial end surface of the stator core via the sealing material After the stator is supported, the closed space is decompressed by the decompression means, and the pressure in the closed space is made lower than the hydraulic pressure of the varnish. And the varnish impregnation apparatus of the rotary electric machine stator, characterized by being configured so as to facilitate penetration of the varnish into the gap and the surface of the coil in the plurality of slots from one of the coil end portion above. For a stator for a rotating electrical machine in which coils are arranged in a plurality of slots in a stator core in which a plurality of electromagnetic steel sheets are laminated in the axial direction, an insulating varnish is impregnated in the gaps in the plurality of slots and the surfaces of the coils. A device for causing
  A varnish storage container for storing the varnish;
  From the inner peripheral side of the stator core, inner peripheral closing means for closing the entire gap between the plurality of electromagnetic steel sheets,
  From the outer peripheral side of the stator core, outer periphery closing means for closing the entire gap between the plurality of electromagnetic steel sheets,
  Pressurizing means for pressurizing the varnish stored in the varnish storage container toward one axial end surface of the stator core;
  A space forming means for covering the opening at the other end surface in the axial direction of the plurality of slots and forming a closed space for blocking the opening from outside air;
  Pressure reducing means for decompressing the closed space in the space forming means,
  The space forming means has a container shape formed by forming a facing portion facing the other end surface in the axial direction of the stator core, and an outer peripheral arrangement portion standing in an annular shape from the facing portion and disposed on the outer peripheral side of the stator core. Frame,
  The inner peripheral closing means is composed of a rubber tube that is in close contact with the inner peripheral surface of the stator core by inflating with gas inside.
  The outer periphery closing means is constituted by an annular rubber tube that is held in the outer peripheral arrangement portion and is in close contact with the outer peripheral surface of the stator core by inflating with gas inside.
  The inner peripheral blocking means and the outer peripheral blocking means close the entire gap between the plurality of electrical steel sheets, and form a state in which the openings at the one axial end surfaces of the plurality of slots are blocked from the outside air. After the stator is supported, the varnish in the varnish storage container is pressurized toward the one axial end surface of the stator core by the pressurizing means, whereby one of the coils protruding from the axial one end surface of the stator core. One coil end portion, which is a portion, is immersed in the varnish in the varnish storage container, and the varnish is removed from the openings in the axial end surfaces of the plurality of slots and the gaps in the plurality of slots and the coils. Configured to penetrate the surface,
  A varnish impregnation device for a stator for a rotating electrical machine, wherein when the varnish in the varnish storage container is pressurized by the pressurizing means, the closed space is decompressed by the decompression means. For a stator for a rotating electrical machine in which coils are arranged in a plurality of slots in a stator core in which a plurality of electromagnetic steel sheets are laminated in the axial direction, an insulating varnish is impregnated in the gaps in the plurality of slots and the surfaces of the coils. A device for causing
  A varnish storage container for storing the varnish;
  Inner circumferential communication closing means for closing the axial communication state of the stator core in the axial direction;
  Pressurizing means for pressurizing the varnish stored in the varnish storage container toward one axial end surface of the stator core;
  A pressing means for pressing the other axial end surface of the stator core toward the opening tip of the varnish storage container;
  A space forming means for covering the opening at the other end surface in the axial direction of the plurality of slots and forming a closed space for blocking the opening from outside air;
  Pressure reducing means for decompressing the closed space in the space forming means,
  The varnish storage container has its opening tip portion closely attached to an axial end surface of the stator core via a sealing material, and the openings at the axial end surfaces of the plurality of slots are blocked from outside air. Configured to form a state,
  The space forming means has a facing portion opposed to the other axial end surface of the stator core, and an annular standing portion erected in an annular shape from the facing portion, and the annular tip portion of the annular standing portion is It is configured to form a state in which the stator core is in close contact with the other end surface in the axial direction via a sealing material,
  The inner circumferential communication blocking means closes the axially connected state of the stator core in the axial direction, and the pressing means presses the other axial end surface of the stator core, thereby the plurality of electromagnetic waves constituting the stator core. After eliminating the gap between the steel plates and supporting the stator by forming a state in which the opening tip of the varnish storage container is in close contact with the one axial end surface of the stator core via a sealing material, By pressing the varnish in the varnish storage container toward the one axial end surface of the stator core by pressurizing means, one coil end portion that is a part of the coil protruding from the axial end surface of the stator core is While immersing in the varnish in the varnish storage container, the varnish from the opening in the axial end surface of the plurality of slots Serial Yes configured so as to penetrate into the gap and the surface of the coil in a plurality of slots,
  A varnish impregnation device for a stator for a rotating electrical machine, wherein when the varnish in the varnish storage container is pressurized by the pressurizing means, the closed space is decompressed by the decompression means. For a stator for a rotating electrical machine in which coils are arranged in a plurality of slots in a stator core in which a plurality of electromagnetic steel sheets are laminated in the axial direction, an insulating varnish is impregnated in the gaps in the plurality of slots and the surfaces of the coils. A method of
  Covering a varnish storage container for storing varnish, inner peripheral communication closing means for closing an axial communication state on the inner peripheral side of the stator core, and openings in the other axial end surfaces of the plurality of slots, Using a space forming means for forming a closed space that blocks the opening from outside air,
  The varnish storage container has its opening tip portion closely attached to an axial end surface of the stator core via a sealing material, and the openings at the axial end surfaces of the plurality of slots are blocked from outside air. The space forming means is configured to form a state in which the opening tip is closely attached to the other axial end surface of the stator core via a sealing material,
  The inner peripheral communication blocking means closes the axially connected state of the stator core in the axial direction, and one coil end portion that is a part of the coil protruding from one axial end surface of the stator core is connected to the varnish. By contacting the varnish in the storage container and pressing the other axial end surface of the stator core, the gap between the plurality of electromagnetic steel sheets constituting the stator core is eliminated, and the opening tip of the space forming means Is formed in close contact with the other axial end surface of the stator core via a sealing material, and the opening tip of the varnish storage container is closely adhered to one axial end surface of the stator core via the sealing material. A stator support step for supporting the stator;
  By depressurizing the enclosed space and making the pressure in the enclosed space lower than the hydraulic pressure of the varnish, the varnish penetrates from the one coil end portion into the gaps in the plurality of slots and the surface of the coil. And a varnish impregnation step for promoting the varnish. For a stator for a rotating electrical machine in which coils are arranged in a plurality of slots in a stator core in which a plurality of electromagnetic steel sheets are laminated in the axial direction, an insulating varnish is impregnated in the gaps in the plurality of slots and the surfaces of the coils. A method of
  Covering a varnish storage container for storing varnish, inner peripheral communication closing means for closing an axial communication state on the inner peripheral side of the stator core, and openings in the other axial end surfaces of the plurality of slots, Using a space forming means for forming a closed space that blocks the opening from outside air,
  The varnish storage container has its opening tip portion closely attached to an axial end surface of the stator core via a sealing material, and the openings at the axial end surfaces of the plurality of slots are blocked from outside air. The space forming means is configured to form a state in which the opening tip is closely attached to the other axial end surface of the stator core via a sealing material,
  The inner circumferential communication blocking means closes the axially connected state of the stator core in the axial direction, and the pressing means presses the other axial end surface of the stator core, thereby the plurality of electromagnetic waves constituting the stator core. The gap between the steel plates is eliminated, the opening tip of the space forming means is brought into close contact with the other axial end surface of the stator core via a sealing material, and the opening tip of the varnish storage container is axially connected to the stator core. A stator support step for supporting the stator by forming a state of being in close contact with the one end surface via a sealing material;
  One coil end portion which is a part of the coil protruding from one axial end surface of the stator core by pressurizing the varnish in the varnish storage container toward the axial one end surface of the stator core by the pressurizing means A varnish impregnation step of immersing the varnish into the gaps in the plurality of slots and the surfaces of the coils from the openings in the one axial end surfaces of the plurality of slots. A method for impregnating a stator for a rotating electrical machine with a varnish.

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