JPH0731108A - Varnish impregnation method for electric machine - Google Patents

Abstract

PURPOSE:To increase the filling rate of varnish in the slot by making the slot along a slot insulator or filling the gap between the slot and the slot insulator with a filler. CONSTITUTION:In the varnish impregnation method for electric machine, a nozzle 12 for dripping varnish is located to allow dripping of varnish not only to the winding 2 but also to the outside of a slot insulator 4 projecting from the stator core 1. When the varnish dripping onto the winding 2 flows on the winding 2 to fill a slot 9, not only the inside of the slot insulator 4 is filled with varnish but also the varnish dripped to the outside of the slot insulator 4 can flow on the outside of the slot insulator 4 into the gap between the slot 9 and the slot insulator 4. This method increases the filling rate of varnish in the slot 9 and an insulation layer 8 having high filling rate of varnish accelerates dissipation of heat from the winding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for impregnating varnish of electric equipment, which is an improved method of varnishing a winding body of a rotating electric machine or the like.

[0002]

2. Description of the Related Art In an electric device such as a rotary electric machine, a stator made by winding a wire around an iron core is impregnated with varnish to improve the insulation, heat resistance and strength of the stator. Increase the filling rate of varnish in the stator core slot,
The heat generated by the stator windings is efficiently dissipated. As a varnish impregnation treatment method of this type, conventionally, a dripping impregnation method in which varnish is dropped on a stator winding and guided into a stator core slot is used.

A conventional technique will be described with reference to FIGS. FIG. 5 is a schematic external view showing a conventional technique, and FIG. 6 is a partially cutaway XX cross sectional view. In the conventional drip impregnation method, the stator core 1 is tilted and the varnish is dripped from the nozzle 3 from one end surface of the winding 2, and the winding 2 is transmitted to fill the slot 9. As shown in FIG. 6, inside the slot 9, a slot insulator 4 is laid on the inner peripheral surface of the slot 9, a wire 5 is housed inside the slot insulator 4, and an interphase insulator 7 and a wedge 6 are further arranged. The varnish has a slot insulator 4 inside the slot 9.
An insulating layer 8 made of varnish is formed by filling the space between the inner wire 5 and the interphase insulator 7 or the wire 5. As a result, the heat of the winding 2 is dissipated and the dynamic or static rigidity is improved.

[0004]

However, in these drip impregnation methods, the varnish does not sufficiently flow into the gap 11 between the slot 9 and the slot insulator 4, and the gap 11 between the slot 9 and the insulator 4 is present. And especially the slot bottom 10
At both corners of the slot insulator 4, the slot insulator 4 is likely to form a large continuous gap without following the shape of the slot 9, and in the gap 11 between the slot 9 and the slot insulator 4 at the stage of heating and drying and curing the varnish. As a result, the varnish cannot be sufficiently retained and flows out, so that the filling rate of the varnish cannot be increased.

The object of the present invention is a drop impregnation method in which the varnish is dropped from a varnish dropping nozzle and filled in the slot. In the step of pouring the varnish sufficiently into the gap between the slot and the slot insulator to heat and dry the varnish to cure it, The purpose is to hold the varnish in the slots and prevent the varnish from flowing out, and to cure it to form an insulating layer having a high filling rate.

[0006]

A method for impregnating a varnish according to the present invention is a drip impregnation method in which a varnish is dripped from a drip nozzle and filled in a slot. Is positioned so that the slot core can be dropped, and the lower end portion of the rotor core has a slot shape along the slot insulator in order to eliminate a gap between the slot and the slot insulator. Alternatively, by filling the gap between the slots and the slot insulator with a filling material, it is possible to prevent the varnish from being injected into the gap between the slots and the slot insulator and prevent the varnish from flowing out in the gap, thereby increasing the filling rate of the varnish in the slot. It is a feature that enables

[0007]

According to the varnish impregnating method of the present invention, the varnish can be introduced into the gap between the slot and the slot insulator by dropping the varnish on the outside of the slot insulator protruding from the stator core. Further, by eliminating the gap between the slot and the slot insulator at the lower end of the iron core, the varnish that has flowed into the slot and the slot insulator can be held without flowing out, and the filling rate of the varnish can be increased.

[0008]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4. 1 is a schematic external view showing the technique of the present invention, FIG. 2 is a partial cutaway main part sectional view in FIG. 1, and FIG. 3 and FIG. 4 are partial cutaway YY sectional views in FIG. 1 to 3 correspond to claim 1, and FIG. 4 corresponds to claim 2. still,
The same parts as those of the conventional one are designated by the same reference numerals.

1 and 2, the basic structure is the same as that of the prior art, but the feature of the present invention is that the nozzle 12 for dropping the varnish protrudes from not only the winding 2 but also the stator core 1. It is located so that the varnish can be dropped on the outside of the slot insulator 4. According to this, the conventional winding 2
When the varnish dropped onto the slot 9 was filled with the varnish transmitted through the winding 2, the filling of the varnish inside the slot insulator 4 was limited to the varnish dropped outside the slot insulator 4. It is possible to allow the varnish to flow through the outside of the object 4 into the gap between the slot 9 and the slot insulator 4 and to increase the varnish filling rate in the slot 9. As described above, according to the present invention, the insulating layer 8 having a high varnish filling rate can be formed.

Further, in FIG. 3, the shape of the slot 13 having a width that does not affect the electric characteristics at the lower end of the stator core 1 is arranged along the slot insulator 4, and the gap between the slot 9 and the slot insulator 4 is formed. 11 makes it possible to retain the varnish that flows out through the large continuous gaps at both corners of the slot bottom 10 by eliminating the gap only at the lower end of the stator core 1, and the varnish in the slot 9 can be retained. It is possible to increase the filling rate of.

Further, referring to FIG. 4, by filling the gap 14 at the lower end of the stator core 1 with the gap 11 between the slot 9 and the slot insulator 4, particularly the large continuous gaps at both corners of the slot bottom 10, the filling material 14 is injected. The effect of preventing the outflow of varnish similar to the above can be expected by eliminating the gap.
The present invention is not limited to the stator, and similar effects can be obtained with the rotor.

[0012]

As described above, according to the varnish impregnation method of the present invention, the varnish flows into the gap between the slots and the slot insulator and flows out from the continuous large gap generated between the slot and the slot insulator. Since the varnish can be retained, the filling rate of the varnish in the slot is increased, a high-density varnish insulating layer is formed, and the effect of dissipating the heat generated from the winding is further enhanced. Further, the dynamic or static rigidity can be further improved.

[Brief description of drawings]

FIG. 1 is a schematic external view showing an embodiment of the present invention,

FIG. 2 is a partially cutaway cross-sectional view showing an embodiment of the present invention,

FIG. 3 is a partially cutaway sectional view showing an embodiment of the present invention,

FIG. 4 is a partially cutaway sectional view showing a modified example of FIG.

FIG. 5 is a schematic external view showing a conventional technique,

6 is a partially cutaway XX cross-sectional view of FIG. 4 showing a conventional technique.

[Explanation of symbols]

1 ... Stator core, 2 ... Winding, 4 ... Slot insulator, 9, 13 ... Slot, 10 ...
Slot bottom, 11 ... Gap, 14 padding.

Claims (2)

[Claims] 1. A method of impregnating a stator and a rotor, which comprises an iron core and windings mounted in slots of the iron core, with a varnish, wherein a slot shape of a slot insulator at an end of the iron core facing a varnish dropping side is used. As a shape along with, the continuous gap created between the slot and the slot insulator was cut off, and varnish was dropped on the outer surface of the slot insulator protruding from the end surface of the iron core to increase the filling rate of the varnish in the slot. A method for impregnating a varnish of an electric device, comprising: 2. A method of impregnating a stator and a rotor, which comprises an iron core and windings installed in the slots of the iron core, with varnish, wherein a slot at the end of the iron core facing the drip side of the varnish and a slot insulator are provided. Inject the filling into the gap of
The continuous gap generated between the slot and the slot insulator is cut off, and varnish is dropped on the outer surface of the slot insulator protruding from the end surface of the iron core to increase the filling rate in the slot. Varnish impregnation method.