JPH06327201A - Varnish impregnation method for electronic appliance and device therefor - Google Patents

Abstract

PURPOSE:To effectively perform varnish impregnation even between the small gaps of windings and to perform uniform impregnation on the whole. CONSTITUTION:A dropping nozzle 18 for dropping a varnish V from its tip is provided above and at the same time a chuck device 19 positioned below on the left side and inserted into the inner circumferential part of a stator iron core 12 to support the stator 11 in the slanting state is provided. A rotation driving means for rotating the chuck device 19 in the direction of arrow A is provided and at the same time a vibration applying means for applying vibration to the chuck means 19 from the direction of arrow B is provided. When the varnish V is dropped at the upper end of a winding 13, the stator 11 is rotated and at the same time vibrated in the radial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for impregnating varnish of electric equipment, which is an improved method of varnishing a winding body such as a stator of a rotary electric machine.

[0002]

2. Description of the Related Art In electrical equipment such as rotating electric machines, a varnish impregnation treatment is performed on a stator having a winding wire wound around an iron core. Conventionally, as this type of varnish impregnation treatment method, a drop impregnation method in which varnish is dropped and impregnated into a stator is known.

A conventional method of impregnating varnish by the drop impregnation method will be described with reference to FIGS. 7 and 8. The stator 1 of the rotating electric machine has a stator core 2 and a slot 2a.
The winding 3 is wound so as to be housed inside. At this time, as shown in FIG. 8, a slot insulator 4 is provided on the inner surface of the slot 2a, and the winding 3 is fixed by an insulating wedge 5. When performing the varnish impregnation treatment, as shown in FIG. 7, the stator 1 is fixedly arranged below the dropping nozzle 6 in a tilted state, and the varnish is dropped from the dropping nozzle 6 to the upper end of the winding 3. I was doing.

Thus, the dropped varnish flows down the winding 3 and is filled into the slots 2a, etc., and the surface of the stator 1 as a whole, between the wires 3a of the winding 3, and the winding 3 are covered. An insulating layer 7 (see FIG. 8) made of varnish is formed between the slot insulator 4 and the slot insulator 4, thereby improving the heat radiation effect and heat resistance and vibration resistance of the winding 3, and the stator core of the winding 3. It is designed to strengthen the adhesive strength to 2 and prevent insulation deterioration.

[0005]

However, in the above-mentioned conventional varnish impregnation method, the varnish is applied to a portion where the gap between the wires 3a of the winding wire 3 or between the wires 3a and the slot insulator 4 is narrow. It had a drawback that it was not easily impregnated. Also, the varnish filling rate is high in the portion where the varnish is dropped,
The varnish filling rate becomes low in the part away from it,
There is also a drawback that the varnish is not uniformly impregnated over the entire stator 1.

The present invention has been made in view of the above circumstances, and an object thereof is to allow a varnish to be effectively impregnated even in a narrow gap of a winding body and to uniformly impregnate the entire winding body with the varnish. The present invention provides a method and apparatus for impregnating varnish of an electric device that can be used.

[0007]

A method for impregnating a varnish for an electric device according to the present invention is a method for impregnating a varnish by dropping a varnish from above onto a winding body composed of an iron core and a winding provided on the iron core. In the impregnation method, the winding body is rotated about its axis, and the varnish is dropped while vibrating the winding body (claim 1). invention).

The varnish impregnating apparatus for electric equipment according to the first aspect of the present invention impregnates the varnish by dropping the varnish onto the winding body including the iron core and the winding provided on the iron core. And a dripping nozzle for dropping varnish, which is provided above a supporting portion on which the winding body is set, and a rotary drive for rotating the winding body provided on the supporting portion around its axis. The present invention is characterized in that it is provided with a means and a vibration applying means which is provided in the support portion and applies vibration to the winding body (the invention of claim 2).

Further, in the varnish impregnating apparatus for electric equipment according to the second aspect of the present invention, there is provided a dropping nozzle provided above the supporting portion on which the winding body is set, for dropping the varnish, and the winding wire provided on the supporting portion. The present invention is characterized in that it is provided with a drive means for rotating the body about its axis while vibrating the body (the invention of claim 3).

[0010]

According to the method for impregnating varnish of electric equipment of the present invention,
Since the varnish is dropped while rotating the winding body, the position of the winding body where the varnish is dropped gradually changes, and the varnish is uniformly impregnated over the entire winding body. be able to. Further, at the same time, the winding body vibrates and is impregnated with the varnish, so that the varnish enters into a narrow gap such as between the strands of the winding wire.

According to the varnish impregnating apparatus for electric equipment of the first aspect of the present invention, the winding body is vibrated by the vibration applying means while being rotated by the rotation driving means.
In this state, the varnish comes to be dropped from the dropping nozzle. Therefore, the position where the varnish is dropped in the winding body gradually changes, the varnish can be uniformly impregnated throughout the winding body, and the varnish is generated while the winding body vibrates. Since the varnish is impregnated, the varnish can penetrate into a narrow gap such as between the strands of the winding.

Further, according to the varnish impregnating apparatus for electric equipment of the second aspect of the present invention, the drive means causes the winding body to vibrate while rotating, and again, the winding body is evenly distributed over the entire winding body. The varnish can be impregnated, and at the same time, the varnish can penetrate into a narrow gap such as between the wires of the winding.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment (corresponding to claims 1 and 2) in which the present invention is applied to a varnish impregnation process for a stator of a rotary electric machine will be described below with reference to FIGS. 1 and 2. First, a schematic configuration of the stator 11 that is a winding body will be described.
As shown in FIG. 1, the stator 11 is configured by winding a plurality of windings 13 around a stator core 12. The stator core 12 is formed by stacking ring-shaped thin steel plates, and has a cylindrical shape as a whole. As shown in FIG. 2, the stator core 12 is provided with a plurality of slots 12a for accommodating the windings 13 so as to open to the inner peripheral side.

The winding 13 is formed by winding an element wire 14 such as a polyesterimide wire and is housed in the slot 12a. At this time, as shown in FIG. 2, a slot insulator 15 is provided on the inner surface of the slot 12a, and the winding 13 is fixed by an insulating wedge 16. Then, by the varnish impregnation treatment described later, the surface of the entire stator 11, the space between the wires 14 of the winding 13, and the winding 1
An insulating layer 17 made of varnish is formed between, for example, 3 and the slot insulator 15. Further, as shown in FIG. 1, the coil end portion 13 a of the winding wire 13 projects vertically from the end surface of the stator core 12.

On the other hand, the varnish impregnating apparatus according to this embodiment for impregnating the stator 11 with varnish is shown in FIG.
As shown in FIG. 3, the two dropping nozzles 18 are provided on the upper side, and the chuck device 19 is provided on the lower side on the left side in the figure. Although not shown in detail, the dripping nozzle 18 is connected to a varnish supply source,
The varnish V is dropped from the tip.

Now, the chuck device 19 is directed obliquely upward to the right in the figure, and when the stator 11 is fitted from above, the chuck device 19 is inserted into the inner peripheral portion of the stator core 12. The stator 11 is supported in an inclined state. Therefore, the portion where the chuck device 19 is provided serves as the support portion according to the present invention.

The chuck device 19 is rotatably provided around a shaft 20 on a base part (not shown), and is rotated by an arrow A by a rotary drive device including a motor (not shown) as a rotary drive means and a power transmission mechanism. It is designed to rotate in the direction. As a result, the stator 11 supported by the chuck device 19 is rotated about its axis. Further, the chuck device 19 is adapted to be vibrated in the direction of arrow B by a vibration imparting device (not shown) as a vibration imparting means. As a result, the stator 11 is adapted to vibrate in the radial direction while being rotated.

Next, the procedure for impregnating the stator 11 with the varnish V will be described. As described above, the stator 11 in which the winding 13 is wound around the stator core 12 is fitted and supported by the chuck device 19. At this time, alignment is performed so that the varnish V from the dropping nozzle 18 is dropped onto the upper end of the coil end portion 13a of the winding 13. Then, in this state, the varnish V is dropped from the dropping nozzle 18 toward the winding wire 13, and the stator 11 is vibrated by the vibration imparting device while the stator 11 is rotated by the rotation driving device.

The varnish dropped on the upper end of the coil end portion 13a of the winding 13 flows down along the winding 13 and is filled in the slots 12a of the stator core 12 or the like. At this time, the varnish V is dropped while rotating the stator 11, so that the portion of the winding 13 where the varnish is dropped gradually changes in the circumferential direction, and the entire stator 11 is covered. The varnish can be evenly impregnated. Along with this, the varnish V is impregnated while the stator 11 vibrates, so that the varnish V enters even a narrow gap such as between the wires 14 of the winding wire 13.

Thereafter, the varnish V is hardened to cure the varnish V on the entire surface of the stator 11, between the wires 14 of the winding 13, between the winding 13 and the slot insulator 15, and the like.
Thus, the insulating layer 17 is formed. As a result, the heat dissipation effect of the stator 11 and the heat resistance strength and vibration resistance strength are improved, the fixing force of the winding wire 13 to the stator core 12 is strengthened, and the insulation deterioration is prevented. .

As described above, according to this embodiment, the stator 11
Since the varnish V is dropped while rotating and vibrating the varnish, unlike the conventional case where the varnish is not impregnated into the narrow portion and the varnish is not evenly impregnated, the effect is achieved even in the narrow gap. The varnish V can be effectively impregnated, and the varnish V can be uniformly impregnated in the entire circumferential direction of the stator 11. As a result, the heat dissipation effect and heat resistance strength and vibration resistance strength of the stator 11 are improved, the fixing force of the winding wire 13 to the stator core 12 is strengthened, and insulation deterioration is prevented.

Further, in this case, in order to sufficiently impregnate the portion which is difficult to be impregnated with varnish in the conventional case, the amount of varnish used is large as a whole, but in the present embodiment, it is evenly distributed over the entire circumference. Since the varnish V can be impregnated, it is possible to obtain an effect that the amount of the varnish V used can be reduced.

3 and 4 show a second embodiment of the present invention (also corresponding to claims 1 and 2). The present embodiment is different from the first embodiment described above in that the roller 21 as the vibration applying means is replaced with a roller 21 as the vibration applying means in place of the structure in which the vibration applying device applies the vibration to the chuck device 19.
It is a point that vibration is applied to the stator 11 by pressing it against the outer peripheral surface of 2.

In this case, the roller 21 is constructed so as to have uneven portions on the outer circumference in the circumferential direction alternately as shown in FIG.
As shown in FIG. 5, the roller core 22 is rotatably supported and is applied to the outer peripheral surface of the stator core 12 in a state where a required pressing force is obtained by the spring 23.
At this time, the rotation axis of the roller 21 is positioned parallel to the axis of the stator 11. Further, the chuck device 19 is also rotated in the direction of arrow A by the rotation driving device.

With this, when the stator 11 is rotated by the chuck device 19, the roller 21 placed on the outer peripheral surface of the stator core 12 is also rotated. That is, the stator 11 starts to vibrate. Therefore, also in this embodiment, as in the case of the first embodiment, the varnish V can be effectively impregnated even in a narrow gap, and the varnish V is evenly impregnated in the entire circumferential direction of the stator 11. Further, it is possible to obtain the effect that the amount of the varnish V used can be reduced.

5 and 6 show a third embodiment of the present invention (corresponding to claims 1 and 3). In the present embodiment, the chuck device 19 that supports the stator 1 is
The shaft 1 is rotatably provided at the base, and the stator 1 is located below the drip nozzle 18 and is rotatably set about its axis. Then, the stator 1 is adapted to be rotated by a roller 31 placed on the outer peripheral surface of the stator core 12.

As shown in FIG. 6, the roller 31 is formed by alternately arranging circumferentially convex and concave portions on the outer circumference, and as shown in FIG. 5, a shaft 33 rotated by a motor 32 in the direction of arrow C. It is provided at the tip of. This roller 31
However, when the motor 32 is driven in a state where the rotor 32 is placed on the outer peripheral surface of the stator core 12, the rotor 11 rotates in the arrow A direction while vibrating. Therefore, the roller 31, the motor 32, and the shaft 33 constitute the driving means according to the present invention.

Also in this structure, as in the first and second embodiments, the varnish V can be effectively impregnated even in a narrow gap, and the varnish is evenly distributed in the entire circumferential direction of the stator 11. V can be impregnated, and the effect of reducing the amount of varnish V used can be obtained.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and various modifications are conceivable, for example, as a configuration for rotationally driving and vibrating the winding body. Can be appropriately changed and implemented.

[0030]

As is apparent from the above description, according to the method for impregnating varnish of electric equipment of the present invention, the winding body is rotated about its axis and the winding body is vibrated. Since the varnish is dropped, the varnish can be effectively impregnated even in the narrow gap of the winding body, and the varnish can be evenly impregnated throughout the entire body. It has excellent practical effects such as improvement, heat resistance strength, vibration resistance strength, strengthening of the fixing force of the winding wire to the iron core, and prevention of insulation deterioration.

Further, according to the varnish impregnating apparatus for electric equipment of the present invention, the winding body is rotated about its axis and the varnish is dropped while vibrating the winding body. Therefore, the varnish can be effectively impregnated even in the narrow gap of the winding body, and the varnish can be evenly impregnated throughout the entire body. As a result, the heat radiation effect of the winding body can be improved and the heat resistance and vibration resistance can be improved. It is possible to effectively improve the above-mentioned properties, strengthen the fixing force of the winding wire to the iron core, and prevent the deterioration of insulation.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention, and is a vertical sectional front view showing a state of a main part during a varnish impregnation process.

FIG. 2 is a cross-sectional plan view showing a main part of a stator.

FIG. 3 is a diagram corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 4 is a perspective view of a roller.

FIG. 5 is a diagram corresponding to FIG. 1 showing a third embodiment of the present invention.

FIG. 6 is a perspective view of a roller.

FIG. 7 is a front view showing a state of a main part during a varnish impregnation process in a conventional example.

FIG. 8 is a view corresponding to FIG.

[Explanation of symbols]

In the drawing, 11 is a stator (winding body), 12 is a stator core,
13 is a winding wire, 14 is a wire, 17 is an insulating layer, 18 is a dropping nozzle, 19 is a chuck device, 20 is a shaft, 21 is a roller, 22 is a roller support, 23 is a spring, 31 is a roller,
32 is a motor, 33 is a shaft, and V is a varnish.

Claims (3)

[Claims] 1. A method of impregnating a varnish into a winding body comprising an iron core and a winding provided on the iron core by dropping varnish from above, wherein the winding body has an axial center. A method for impregnating a varnish of an electric device, characterized in that the varnish is dripped while the winding body is vibrated while being rotated around the center. 2. An apparatus for impregnating a varnish by dropping varnish from above onto a winding body composed of an iron core and a winding provided on the iron core, wherein the winding body is set. A dripping nozzle that is provided above the supporting portion and drips varnish; a rotation driving unit that is provided in the supporting portion and rotates the winding body about its axis; and a winding nozzle that is provided in the supporting portion. A varnish impregnating apparatus for electric equipment, comprising: a vibration applying unit that applies vibration. 3. A device for impregnating a varnish by dropping varnish from above onto a winding body comprising an iron core and a winding provided on the iron core, wherein the winding body is set. An electric device comprising: a dropping nozzle provided above the supporting portion for dropping the varnish; and a driving means provided on the supporting portion for rotating the winding body around its axis while vibrating the winding body. Varnish impregnation device.