Machine for vacuum impregnation of stator windings

Abstract

The invention relates to a machine for vacuum impregnation of stator windings, the machine having a conveying device which passes the stator windings through a region of the machine enclosed by a housing, wherein the wall of the housing has at least one first stainless steel plate on its inner side which at least partially delimits the region, wherein an insulating plate is arranged on the side of the first stainless steel plate facing away from the region, wherein a first composite material plate is arranged on the side of the insulating plate facing away from the first stainless steel plate, and a second composite material plate is arranged on the side of the first composite material plate facing away from the insulating plate, wherein on the side facing the external environment, the wall has second stainless steel plates which are welded to one another with fully load-bearing seams, in particular weld seams.

Description

[0001] Machine for vacuum impregnation of stator windings

[0002] Description:

[0003] The invention relates to a machine for vacuum impregnating stator windings.

[0004] Wool, especially when combined with organic additives, is generally known for its thermal insulation properties.

[0005] The invention is therefore based on the objective of further developing a machine for vacuum impregnation of stator windings, whereby the risk of fire is to be reduced and energy losses are to be minimized.

[0006] According to the invention, the problem is solved in the machine according to the features specified in claim 1 and in the method according to claim 8.

[0007] Key features of the invention for the machine for vacuum impregnating stator windings are that the machine has a conveying device which guides the stator windings through a space enclosed by a housing, wherein the wall of the housing has at least a first stainless steel plate on its inner side, which at least partially delimits the space, wherein an insulating plate is arranged on the side of the first stainless steel plate facing away from the space, wherein a first composite material plate is arranged on the side of the insulating plate facing away from the first stainless steel plate, wherein a second composite material plate is arranged on the side of the first composite material plate facing away from the insulating plate, wherein the wall facing the external environment has second stainless steel plates which are welded together with fully load-bearing seams, in particular weld seams.

[0008] A key advantage is that the first stainless steel panels prevent gases from escaping from the interior, thus suppressing the risk of fire. Furthermore, the layered structure allows for the construction of a load-bearing wall despite the high temperatures in the room. This layered structure enables the fulfillment of various requirements; in particular, while the stainless steel repels chemicals, it conducts heat and does not insulate. These functions are performed by the subsequent layers. The insulation panel provides insulation at very high temperatures, while the composite panels offer good, cost-effective insulation at lower temperatures.

[0009] The invention therefore reduces the risk of fire and reduces energy losses, in particular losses of heat energy.

[0010] Thus, the stator windings can be impregnated with the lacquer under vacuum.

[0011] In a preferred embodiment, the first composite material panel incorporates rock wool. The advantage here is that cost-effective, highly effective thermal insulation can be achieved.

[0012] In a preferred embodiment, the second composite material panel incorporates rock wool. The advantage here is that cost-effective, highly effective thermal insulation can be achieved.

[0013] The use of two composite material plates allows for increased safety in thermal insulation, as the composite material plates can be offset from each other, so that separation areas are covered by the other layer.

[0014] In an advantageous design, the insulation board contains asbestos, ceramic, and / or rock wool. The advantage here is that cost-effective, highly effective thermal insulation can be achieved.

[0015] In an advantageous embodiment, the insulation board is microporous and has a core sewn into an outer shell of glass fabric or rock wool, the core comprising pyrogenic silica or pyrogenic alumina. The advantage here is that cost-effective, highly efficient thermal insulation can be achieved up to high temperatures of over 1000 °C.

[0016] In a preferred embodiment, a vacuum is created in the room area by a vacuum pump. The advantage here is that high quality can be achieved because air is removed, allowing the impregnating agent to penetrate properly.

[0017] In a preferred embodiment, the room area is heated to a temperature of more than 500°C, in particular to a temperature between 500°C and 700°C. It is advantageous that the impregnating agent can be applied in liquid or vapor form and then cures quickly.

[0018] In an advantageous embodiment, the chamber is cuboid in shape, with the first stainless steel plate and subsequent first stainless steel plates being welded together to form the inner side of the wall that at least partially encloses the chamber, in particular by means of fully load-bearing welds, especially those located at the inner corners and edges of the inner side of the wall. An advantage of this is that chemical separation can be achieved.

[0019] Instead of varnish, another impregnating agent can also be used.

[0020] Important features of the method for manufacturing an electric motor are that the electric motor has a stator winding which is manufactured with a machine according to one of the preceding claims.

[0021] The advantage of this process is that quality defects are suppressed, as the impregnation is carried out under vacuum and at high temperature. This allows for the cost-effective production of a high-quality motor with superior manufacturing quality.

[0022] Further advantages arise from the dependent claims. The invention is not limited to the combination of features of the claims. For those skilled in the art, further meaningful combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent, in particular from the problem statement and / or the problem arising from a comparison with the prior art.

[0023] The invention will now be explained in more detail with reference to schematic illustrations:

[0024] Figure 1 shows a machine 1 according to the invention for vacuum impregnating stator windings of electric motor stators in an oblique view with a sectioned wall area, which is also shown enlarged.

[0025] As shown in the figure, the machine has a housing whose wall is structured in layers.

[0026] During vacuum impregnation of the stator windings, they are moved through a chamber within the machine enclosed by the housing, while high temperatures, particularly above 500°C, prevail in this chamber, especially under a vacuum. An impregnating agent, particularly lacquer, is used for the impregnation process.

[0027] The vacuum is preferably generated by an industrially standard vacuum pump, so that there is not a physically perfect vacuum but a slight residual air pressure in the room.

[0028] Machine 1 enables a continuous process, as the stator windings are moved through the space area by a transport means.

[0029] To achieve thermal insulation, the wall of the housing has a layered structure, in which a first stainless steel plate 2 is arranged on the inside, followed by an insulation plate 3, wherein on the side of the insulation plate 3 facing away from the first stainless steel plate 2 a first composite material plate 4 is arranged and followed by a second composite material plate 5, which are covered towards the outside environment by second stainless steel plates 6 welded together by means of one or more fully load-bearing welds 7.

[0030] The insulation panel 3 preferably contains asbestos, ceramic and / or rock wool, so that thermal insulation against high temperatures can be achieved by the insulation panel 3.

[0031] The composite materials 4 and / or 5 contain rock wool and thus improve thermal insulation. The fully load-bearing seam 7 also prevents the escape of vapors.

[0032] Since the room area is preferably cuboid in shape and the inside of the wall is formed from the first stainless steel plate 2 and further stainless steel plates, these stainless steel plates are preferably also welded together at the corners and edges of the cuboid with a respective fully load-bearing seam 7. This prevents the escape of gases and vapors through the wall.

[0033] Each stator winding, impregnated by the machine, is used to manufacture an electric motor. The impregnation process improves at least the cohesion of the individual coil winding. With a suitable varnish, an improvement in electrical insulation strength can also be achieved, either partially or in specific areas.

[0034] In particular, the housing is designed in such a way that the enclosed space of the machine is so tightly sealed, especially with such a high degree of protection, that a sufficient negative pressure for vacuum impregnation, especially against the ambient air pressure, is maintained for the duration of the vacuum impregnation process, even in the event of a vacuum pump failure.

[0035] In further embodiments of the invention, the composite materials (4, 5) and / or the lacquer contain organic additives. However, since the first stainless steel plate 2 is arranged as a partition towards the room area, no carbonization and no fire hazard can occur.

[0036] In further alternative embodiments of the invention, the insulating panel is microporous and has a core which is sewn into an outer shell made of glass fabric, wherein the core comprises pyrogenic silica or pyrogenic alumina. Reference numeral list

[0037] 1 machine 2 stainless steel plate, inside

[0038] 3 Insulation board

[0039] 4 Composite material panel

[0040] 5 Composite material panel

[0041] 6 stainless steel plate, outer 7 fully load-bearing seam

Claims

Patent claims:

1. Machine for vacuum impregnation of stator windings, the machine comprising a conveying device which guides the stator windings through a space area of ​​the machine enclosed by a housing, characterized in that the wall of the housing, at its end at least partially delimiting the space area the inner side has at least one first stainless steel plate, wherein an insulating plate is arranged on the side of the first stainless steel plate facing away from the room area, wherein a first composite material plate is arranged on the side of the insulating plate facing away from the first stainless steel plate, wherein a second composite material plate is arranged on the side of the first composite material plate facing away from the insulating plate, wherein the wall has second stainless steel plates facing the external environment, which are welded together with fully load-bearing seams, in particular weld seams.

2. Machine according to claim 1, characterized in that the first composite material panel comprises rock wool, and / or that the second composite material panel comprises rock wool.

3. Machine according to one of the preceding claims, characterized in that the insulation board comprises asbestos, ceramic and / or rock wool or that the insulation board is microporous and has a core which is sewn into an outer shell of glass fabric or rock wool, wherein the core comprises pyrogenic silica or pyrogenic alumina.

4. Machine according to one of the preceding claims, characterized in that a vacuum generated by a vacuum pump is formed in the space area.

5. Machine according to one of the preceding claims, characterized in that the room area is heated to a temperature of more than 500°C, in particular to a temperature between 500°C and 700°C.

6. Machine according to one of the preceding claims, characterized in that the space area is cuboid in shape, wherein the first stainless steel plate and further first stainless steel plates are welded together to form the inside of the wall which at least partially encloses the space area, in particular by means of respective fully load-bearing welds, in particular which are arranged at the inside corners and inside edges of the inside of the wall.

7. Machine according to one of the preceding claims, characterized in that the housing is designed such that the enclosed space area of ​​the machine is designed to be so tightly sealed, in particular with such a high degree of protection, that a sufficient negative pressure for vacuum impregnation, in particular against the ambient air pressure, is maintained for the duration of the vacuum impregnation, especially even in the event of failure of the vacuum pump.

8. Method for manufacturing an electric motor, the electric motor having a stator winding which is manufactured with a machine according to one of the preceding claims.

9. Method according to one of the preceding claims, characterized in that a varnish or other impregnating material is used as the impregnating agent.

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