METHOD FOR IMPREGNATING, STRENGTHENING OR ELECTRICALLY INSULATING A BODY BEARING SINGLE-PLY OR MULTI-PLY WINDINGS

Abstract

In a method for impregnating, strengthening or electrically insulating a body supporting single or multi-layer windings, in particular for an electric machine, the body supporting the windings is submerged into a multi-component resin system or is sprinkled with the multi-component resin system or is sprayed with the multi-component resin system.

Claims

1.-11. (canceled)

12. A method for impregnating, strengthening or electrically insulating a body supporting single or multi-layer windings, in particular for an electric machine, said method comprising: separately conveying at least a first component of resin and a second component of a curing agent, with the first component having a viscosity of 2400 to 2600 mPa.Math.s at an ambient temperature of 25° C. and a specific weight of 1.13 to 1.17 g/cm.sup.3, and with the second component having a viscosity of 200 to 300 mPa.Math.s at an ambient temperature of 25° C. and a specific weight of 1.00 to 1.04 g/cm.sup.3; mixing the first and second components with a “parts by weight” mixing ratio of 5 parts resin to 1 part curing agent and a “parts by volume” mixing ratio lies at 4.3 parts resin to 1 parts curing agent, to form a multi-component resin system with a viscosity of 1550 to 1750 mPa.Math.s at an ambient temperature of 25° C. and a specific weight of 1.11 to 1.15 g/cm.sup.3; and sprinkling the multi-component resin system in a form of a jet with a dosing between 0.2 ml/s and 2 ml/s upon the body at an ambient temperature of 15 to 25° C.

13. The method of claim 12, wherein the multi-component resin system is sprinkled upon the body at an ambient temperature of 20 to 23° C.

14. The method of claim 12, further comprising preheating the body to a temperature of 30 to 80° C.

15. The method of claim 14, wherein the body is preheated inductively.

16. The method of claim 12, wherein the resin is an epoxy resin and the curing agent is an amine-based curing agent.

17. The method of claim 12, further comprising rotating the body about an axis when the body is sprinkled with the multi component resin system.

18. The method of claim 12, wherein the multi-component resin system has a viscosity of 300 mPa.Math.s at 25° C.

19. The method of claim 12, wherein the multi-component resin system has a viscosity of 15000 mPa.Math.s after a period of time of 20 to 30 min after striking the body.

20. The method of claim 12, wherein the multi-component resin system is cured at least 95% at the ambient temperature of 15 to 25° C. after less than 100 h.

21. The method of claim 20, wherein the ambient temperature is 20 to 23° C.

22. The method of claim 20, wherein the multi-component resin system is cured at least 97%.

23. The method of claim 20, wherein the multi-component resin system is cured after less than 72 h.

24. An electric machine, in particular a motor, generator or transformer, said electric machine being impregnated, strengthened or electrically insulated by a method as set forth in claim 12.

Description

[0045] The invention is described and explained in more detail below on the basis of the exemplary embodiments shown in the figures, in which:

[0046] FIG. 1 shows the impregnating method,

[0047] FIG. 2 shows an exemplary installation for performing the impregnating method, and

[0048] FIG. 3 shows a dynamoelectric rotating machine during the impregnating method.

[0049] FIG. 1 shows the impregnating method.

[0050] In a first method step, a first component and a second component (reference characters K1 and K2 in FIG. 2) are provided. The first component is preferably a resin, the second component is preferably a curing agent.

[0051] The two components are conveyed separately in a method step S2.

[0052] In a method step S3, the two components are mixed to form a multi-component resin system (10 in FIG. 2), in this case a two-component resin system, and, preferably immediately after being mixed, are applied to a body (7 in FIG. 2) or introduced into the body.

[0053] More than two components are also possible.

[0054] In a method step S4, the multi-component resin system is distributed in cavities in the body due to the rotation of the body. If the body is a stator, for example, then the multi-component resin system is distributed into the slots.

[0055] FIG. 2 shows an exemplary installation for performing the impregnating method.

[0056] The first component K1 and the second component K2 are mixed in the mixing ratio 100:20 indicated by way of example in a mixing tube 3 to form the multi-component resin system 10 and are output as a jet 6 through a nozzle 5 onto the body 7. The body rotates in direction of rotation R about an axis A.

[0057] FIG. 3 shows a dynamoelectric rotating machine 12 during the impregnating method. The figure shows a stator 70 and a rotor 71. By way of the nozzle 5, in the figure the multi-component resin system 10 strikes the stator 70, while the stator 70 is rotating in direction of rotation R about the axis A.

[0058] During further manufacturing steps, rotor and/or stator are for the most part exposed to increased temperatures. This involves, for example, a winding temperature of approx. 80° C. during the shrink-fitting of the aluminum enclosure at 200° C. and a short-circuit test as the final test with freely selectable heating of the winding. An almost 100% curing of the resin system, where possible at all from a chemical perspective, is ensured before completion.

[0059] Without thermal follow-on processes, the curing of the resin system is concluded within a few days. A manufacturing flow is not interrupted, as already after a few minutes there is a drip-free product, the surface of which is not or is only slightly sticky.

[0060] The impregnating method offers many advantages: a significant reduction of the energy costs, depending upon material and manufacturing flow it is possible to reduce a cycle time. By omitting the thermal processes, the installation size and area required can be halved.