JPH074057B2 - Iron core slot insulation paper for rotating electrical machines - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron core slot insulating paper for a rotating electric machine which is housed in a slot of an iron core for a rotating electric machine and insulates between a coil and the iron core.

[0002]

2. Description of the Related Art Conventionally, for example, an automatic coil inserting device for inserting a coil into a slot of a stator core of an electric motor has a structure shown in FIGS.

That is, 1 is a base, 2 is a stripper mounted on the base 1 by a rod 3 so as to be movable up and down, and 4 is a blade standing on the base 1, on which a stator is mounted. The iron core 5 is attached. In this case, the blades 4 are provided in the same number as the slots 5a of the stator core 5 and arranged in a cylindrical shape, and the slot insulators 6 (slot insulation papers) are housed in the respective slots 5a. . Reference numeral 7 denotes wedge guides provided upright on the base 1. The same number of wedge guides are provided corresponding to the blades 4 so that the wedges 8 are guided upward as the stripper 2 rises. Has become.

After inserting the coil 9 into the blade 4 at a predetermined position, the stator core 5 is attached to the blade 4,
Then, when the stripper 2 is lifted via the rod 3, the coil 9 is pushed up by the stripper 2 and automatically inserted into the slot insulator 6 of the corresponding slot 5a of the stator core 5, At the same time, the wedge 8 is inserted into the slot 5a to close its opening.

[0005]

By the way, recently, it has become common to insert a coil having a high coil space factor by reducing the area of the slot 5a due to the high efficiency and energy saving of the electric motor. In this case, the following problems occur.

That is, as shown in FIG. 5, the set length 1 (shown by the product of the outer diameter of the magnet wire and the number of turns) of the coils 9 arranged in a line in the gap of the blade 4 is shown. When the stripper 2 is pushed into the slot insulator 6, the coil 9 is pressed between the slot insulator 6 and the stripper 2 and squeezed to have a slot depth d. Since frictional resistance acts between the two and bending stress also acts on the entire coil 9, the insertion resistance of the coil 9 increases. For this reason, the slot insulator 6 on the insertion side of the coil 9 is damaged, the coil 9 is damaged, etc., resulting in poor withstand voltage.

Here, the damage of the slot insulator 6 or the slot insulating paper 6 will be described in detail. If the insertion resistance of the coil 9 increases, the slot insulating paper 6 may be broken at the portion in contact with the end of the stator core 5. If the insertion resistance of the edge of the slot insulating paper 6 along the opening of the slot 5a is large when the coil 9 is inserted, the edge of the coil 9 may be caught in the wire of the coil 9 and broken. is there.

Therefore, an object of the present invention is to prevent the slot insulating paper and the coil from being damaged when inserting the coil into the slot of the iron core, and to improve the slot insulation. To provide.

[0009]

The iron core slot insulating paper for a rotary electric machine according to the present invention is a slot insulating paper housed in an iron core slot for a rotary electric machine to insulate between a coil and an iron core. The paper is characterized in that the fluid paraffin is adhered to at least the contact surface of the paper on the coil insertion side with the coil.

[0010]

According to the above means, since the fluid paraffin adheres to at least the contact surface of the slot insulating paper with the coil on the coil insertion side, since the fluid paraffin has a lubricating action, the coil is insulated by the slot insulation of the slot. When inserted into the paper, the friction between the coil and the slot insulation paper is reduced. Therefore, the insertion resistance of the coil is reduced, so that the slot insulating paper and the coil can be prevented from being damaged, and the slot insulation is improved.

Further, since the fluid paraffin has volatility (although it is low in volatility), after the coil and the wedge are inserted, the fluid paraffin is volatilized and the coil and the slot insulating paper and the wedge and the slot insulating are insulated. The frictional force with each of the papers returns to the original magnitude (that is, the magnitude of the frictional force when the fluid paraffin is not adhered), and the coil and the wedge are less likely to fall out of the slot.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is applied to a stator of an electric motor will be described below with reference to FIG. Figure 1
In FIG. 1, reference numeral 10 is a slot insulating material made of a foop material such as polyester film, and a guide bar 11 is inserted through the shaft center of the slot insulating material 10. The slot insulating material 10 is fed by a feed roller 12 to the right in FIG. Sent out to. Feed low
A bending mechanism 13 is installed on the right side of the la 12 in FIG. 1, and the cuffs 14 are formed by bending both end portions of the slot insulating material 10 upward by a predetermined length.

On the right side of FIG. 1 of the folding mechanism 13,
An automatic application mechanism 16 for applying the fluid paraffin 15 to the lower surface of the slot insulating material 10 is arranged. This fluid paraffin 15 is a well-known lubricating oil (lubricating liquid), and is called “liquid paraffin” in English. A relatively light lubricating oil fraction, for example, a spindle oil fraction, is a hydrocarbon oil highly refined by sulfuric acid washing. Is. And liquid paraffin 15
Has the characteristics of being colorless and odorless and of low volatility,
It consists mainly of alkyl naphthenes.

Reference numeral 17 denotes a base fixed to a main body (not shown), which has two coil springs 18,
A case 19 is elastically supported via 18. Further, inside the case 19, a coating member 20 made of felt is arranged so as to come into contact with the lower surface of the slot insulating material 10, and the above-mentioned fluid paraffin 15 is stored.

On the right side of FIG. 1 of the automatic coating mechanism 16,
A cutting and forming mechanism 21 for cutting the slot insulating material 10 and forming it into a substantially U-shaped cross section is installed. Two
Reference numeral 2 is a molding upper die fixed to a main body (not shown), and a molding recess 22a which opens downward is formed in the lower surface portion. Reference numeral 23 is a lower molding die to which a cutter 24 is integrally attached, and a molding protrusion 23a corresponding to the molding recess 22a is formed on the upper surface of the lower mold. And this molding lower mold 2
3 is connected to a drive cam 26 via a connecting rod 25, and is vertically moved as the drive cam 26 rotates.

Further, behind the cutting and forming mechanism 21, a cut and formed slot insulating paper 27 is provided.
An insertion rod 28 is arranged to be extruded from and inserted into the slot 5a of the stator core 5. In addition, the cutting and forming mechanism 2
In front of 1, there is provided a guide plate 29 for guiding the insertion of the slot insulating paper 27 into the slot 5a, and a center pole 30 is attached to the center of the front surface of the guide plate 29. The stator core 5 is inserted into and supported by the center pole 30.

Next, the operation of the above configuration will be described. The slot insulating material 10 is sent out to the right in FIG. 1 by a feed roller 12 and enters a bending mechanism 13, where both side ends are bent to form a cuff 14. The slot insulating material 10 is increased in rigidity by forming the cuffs 14 at both end portions thereof, and is moved rightward in FIG.
It comes into contact with the upper surface of the coating member 20. here,
The fluid paraffin 15 contained in the coating member 20 is coated on the lower surface of the slot insulating material 10 by the action of capillarity.

Further, the slot insulating material 10 is moved to the right in FIG. 1 and enters the cutting and forming mechanism 21. When the slot insulating material 10 enters a predetermined length dimension, the drive cam 26 rotates and the driving force thereof is increased. It is transmitted as a force to push it upwards via 25 to raise the lower molding die 23. As a result, the slot insulating material 10 is first cut into a predetermined size, and then pressed between the upper molding die 22 and the lower molding die 23 to form the slot 5a.
Is formed in a substantially U-shape corresponding to the shape.

The slot insulating paper 27 thus formed is pushed forward from the cutting and forming mechanism 21 by the insertion rod 28 and guided by the guide plate 29 into the slot 5a of the stator core 5. Is inserted. By repeating these steps in sequence, the slot insulators 6 are inserted into all the slots 5a of the stator core 5. To insert the coil 9 into the slot 5a, the automatic coil inserting device shown in FIGS. 4 and 5 is used.

According to this embodiment having such a configuration, the following effects can be obtained. That is, the fluid applying paraffin 15 is applied and adhered to the inner surface of the slot insulating paper 27, that is, the contact surface with which the coil 9 contacts by the automatic application mechanism 16, so that when the coil 9 is inserted, the coil 9 and the slot insulating paper 2 are attached.
Friction with the coil 7 is reduced, and insertion resistance of the coil 9 is reduced. As a result, the coil 9 and the slot insulating paper 27
Since it can be prevented from being damaged (broken), the slot insulation is improved.

Further, since the fluid paraffin 15 has volatility (although it is low in volatility), after the coil 9 and the wedge 8 are inserted, the fluid paraffin 15 volatilizes, and the coil 9 and the slot insulating paper. 27 and between the wedge 8 and the slot insulating paper 27 return to their original magnitudes (that is, the magnitudes of the frictional force when the fluid paraffin 15 is not adhered), and the coil 9 and the wedge 8 are slotted. It becomes difficult to fall from within 5a.

Since the fluid paraffin 15 has low volatility, it takes about 1 to 2 days to spontaneously volatilize the fluid paraffin 15 from the slot insulating paper 27. On the other hand, in the actual manufacturing site of the stator of the electric motor, after the coil 9 is inserted, it is necessary to perform the well-known varnish treatment. Therefore, before performing the varnish treatment, the iron core, that is, the slot insulating paper 27. Also, the coil 9 is preheated to forcibly volatilize the liquid paraffin 15 in a short time.

Here, after the liquid paraffin 15 is volatilized, a substance having substantially the same component as the varnish remains on the slot insulating paper 27. Therefore, when the varnish treatment is performed, the substance remaining after the fluid paraffin 15 volatilizes has the same effect as when the varnish is undercoated, so that the varnish easily fits into the slot insulating paper 27 and the varnish treatment is performed well. be able to.

In the above embodiment, the slot insulating paper 2 is used.
Since the liquid paraffin 15 was applied to the entire inner surface of 7,
When inserting the wedge 8, the wedge 8 and the slot insulating paper 27
Since friction between the wedge 8 and the wedge 8 is small and insertion resistance of the wedge 8 is small, the wedge 8 can be prevented from being damaged.

2 and 3 show the second and third embodiments of the present invention. The difference from the first embodiment in which the fluid paraffin 15 is applied by the automatic application mechanism 16 is as follows.
The point is that the fluid paraffin 15 is manually attached to the slot insulating paper 27. Hereinafter, the second and third embodiments will be specifically described.

First, in the second embodiment shown in FIG.
Reference numeral 31 is a slot insulating paper to which the fluid paraffin is not applied, which is bent, cut, and molded by the device shown in FIG. It is housed in the slot 5a. Reference numeral 32 is a spray gun, which rotates the stator core 5 vertically mounted on and supported by the upper surface of the rotary table 33 while rotating the stator core 5 with slot insulating paper 3
Spray liquid paraffin onto the inner surface of 1 from diagonally above.
Thus, the fluid paraffin is attached to the inner surface of the slot insulating paper 31, that is, the contact surface with the coil 9.

Further, in the third embodiment shown in FIG.
Reference numeral 34 is a brush for applying the liquid paraffin, whereby the end 31a of the slot insulating paper 31 located on the side where the coil 9 of the stator core 5 is inserted.
Apply to the inner surface of the. As a result, the slot insulating paper 31
Of these, at least the fluid paraffin is attached to the contact surface with the coil 9 on the coil insertion side.

Therefore, also in each of the second and third embodiments, substantially the same operational effect as in the first embodiment can be obtained. Particularly, in the third embodiment, since the fluid paraffin is applied to the inner surface of the end 31a of the slot insulating paper 31 by the brush 34, the applied fluid paraffin is slightly applied onto the slot insulating paper 31. It comes to adhere a lot. Therefore, when the coil 9 is inserted into the slot insulating paper 31 of the slot 5a, the fluid paraffin adheres to the wire of the coil 9 and the coil 9 is inserted, so that the insertion resistance of the coil 9 is further reduced. To do.

Although each of the above embodiments is the case where the present invention is applied to the stator core of an electric motor, the present invention is not limited to this and can be applied to a stator core of a generator, for example.

[0030]

As is apparent from the above description, the present invention has a structure in which the fluid paraffin is adhered to at least the contact surface of the slot insulating paper with the coil on the coil insertion side. When inserting into
It has an excellent effect that the slot insulating paper and the coil can be prevented from being damaged.

[Brief description of drawings]

FIG. 1 is a perspective view of an entire apparatus showing a first embodiment of the present invention.

FIG. 2 shows a second embodiment of the present invention and is a perspective view showing an operation of adhering fluid paraffin.

FIG. 3 shows a third embodiment of the present invention and is a perspective view showing an operation of adhering fluid paraffin.

FIG. 4 is a sectional view of an automatic coil insertion device.

FIG. 5 is an enlarged sectional view of a main part of the automatic coil insertion device.

[Explanation of symbols]

5 is a stator core, 5a is a slot, 9 is a coil, 10 is a slot insulating material, 13 is a bending mechanism, 14 is a cuff,
Reference numeral 15 is a fluid paraffin, 16 is an automatic coating mechanism, 20 is a coating member, 21 is a cutting and forming mechanism, 27 and 31 are slot insulating papers, and 28 is an insertion rod.

Claims (1)

[Claims] 1. A slot insulating paper housed in an iron core slot for a rotating electric machine to insulate between a coil and an iron core, wherein a fluid is provided on at least a contact surface of the slot insulating paper on the coil insertion side with the coil. Iron core slot insulating paper for rotating electric machines, characterized by having paraffin attached.