JPH056419B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a binding for a rotating electric machine.

[Conventional technology]

As described in Japanese Patent Application Laid-Open No. 51-48101, conventional binding for holding the end of the rotor winding has the risk of the end of the rotor winding popping out in the outer radial direction due to the centrifugal force that accompanies rotation. It is used to prevent this.

Traditionally, tin-plated piano wire or steel bind wire such as non-magnetic steel wire has been used as this bind, but in recent years glass bind tape has been used, although it is lightweight and has insulating properties.

This glass bind tape is usually semi-cured by impregnating it with a solvent-free varnish such as epoxy resin, and after wrapping this tape around the outer circumference of the end of the rotor winding, The material is heated to a certain temperature and hardened to have a predetermined strength.

3 and 4 show a conventional example of a binding according to a method of manufacturing a binding for a rotating electric machine. As shown in the figure, a bind 3 formed by winding a glass bind tape is provided around the outer periphery of a rotor winding 2 protruding from a rotor core 1. By the way, the cured varnish 4 is formed on the surface of the bind 3 in an uneven shape. This is because the solvent-free varnish impregnated into the glass bind tape 3a wound through the binder 5 leaks between the outer circumferential surface of the binder and the release tape 7 due to shrinkage of the heat-shrinkable tape 6 due to heating. However, conventionally, this point has not been given sufficient consideration.

[Problems to be solved by the invention] The cured varnish produced on the surface of the bind in the prior art has inferior mechanical strength such as tensile strength compared to the bind, and is susceptible to temperature rises caused by the startup of rotating electric machines. Cracks are likely to occur due to the heat cycle with cooling caused by stopping. When cracks occur in the cured varnish, co-cracking also occurs in the bind. As a result, the strength of the bind was significantly reduced, making it impossible to maintain a predetermined strength, and there was an extremely high possibility that the rotor would become extremely dangerous.

As a countermeasure to this problem, it is possible to remove the hardened varnish that adheres to the bind in an uneven manner.
This results in a significant increase in machining time, which poses a major problem in productivity, especially for mass-produced items such as electric motors for vehicles.

The present invention has been made in view of the above points,
It is an object of the present invention to provide a method for manufacturing a binding for a rotating electric machine, which makes it possible to prevent the formation of a varnish cured product on the surface of the binding.

[Means to solve the problem]

The above purpose is to wrap a first glass bind tape impregnated with a solvent-free varnish on the end of the rotor winding, and then apply a solvent-free varnish on the wound first glass bind tape. This is achieved by wrapping a second glass bind tape which is not impregnated with the above, and heating and curing these first and second glass bind tapes at once.

[Effect]

The varnish of the first glass bind tape is impregnated with a solvent-free varnish and wound in a semi-cured state.
The heat-shrinkable tape wrapped around the outermost surface to form the binder is tightened by heating, causing the adhesive to flow out to the outer surface. This spilled varnish is applied to the outer periphery of the first wound glass bind tape, which is coated with a second glass bind tape that is not impregnated with varnish.
Since the second glass bind tape is wrapped around the second glass bind tape, the second glass bind tape is easily absorbed and hardened. This prevents the formation of varnish pools on the surface of the bind, which prevents the formation of cured varnish, and prevents the occurrence of cracks in the cured varnish and the associated co-cracking of the bind. Further, since there is no need to remove the cured varnish, processing time can be reduced and productivity can be improved.

[Example] The present invention will be described below based on the illustrated example. An embodiment of the invention is shown in FIGS. 1 and 2. FIG. Note that the same reference numerals are given to parts that are the same as those of the conventional model, so a description thereof will be omitted. In this embodiment, a first glass bind tape 3a 1 impregnated with a solvent-free varnish is wound on the end of the rotor winding ₂ , and then the first glass bind tape 3a ₁ is wrapped around the end of the rotor winding 2. A second glass bind tape 3a ₂ not impregnated with a solvent-free varnish was wound around the glass binder, and the first and second glass bind tapes 3a ₁ and 3a ₂ were heated and cured at once. By doing this, the varnish flowing out from the first glass bind tape 3a ₁ during curing is impregnated into the second glass bind tape 3a ₂ and hardened, and the bind 3A
It is possible to obtain a method for manufacturing a binding 3A for a rotating electric machine, which prevents varnish from forming on the surface of the binder 3A and prevents the formation of cured varnish on the surface.

That is, the end of the rotor winding 2 is appropriately wrapped with a semi-cured first glass bind tape 3a ₁ made by impregnating a glass tape with a solvent-free varnish such as epoxy resin that has excellent heat resistance and adhesive strength. Turn. A second glass bind tape 3a ₂ not impregnated with varnish is appropriately wound around the outer periphery of the wound first glass bind tape 3a ₁ . Next, a release tape 7 is wound around the outer periphery of the wound second glass bind tape _3a2 , and then a heat shrink tape 6 is wound around the outer periphery of the second glass bind tape 3a2.

If heated at an appropriate temperature in this state, the heat-shrinkable tape 6 wrapped around the outermost layer will shrink, and the wrapped first glass bind tape 3a ₁ and second glass bind tape 6 will shrink.
Compress the glass bind tape 3a ₂ . This causes the varnish impregnated in the first glass binding tape 3a ₁ wrapped on the end of the rotor winding 2 to flow out onto the outer surface. However, since the second glass bind tape 3a ₂ that is not impregnated with varnish is wrapped around the outside of the first glass bind tape 3a 1 that has been wrapped, the second glass bind tape 3a ₂ that is not impregnated with varnish is It is easily absorbed and hardened by the tape _3a2 . After curing, the binder 5, heat shrink tape 6, and release tape 7 are removed to form the binder 3A.

In this way, according to this embodiment, the varnish that has been impregnated into the first glass bind tape 3a ₁ that is wound during curing flows out onto the second glass bind tape 3a ₂ that is wound thereon. As the impregnation hardens, varnish pools are formed on the surface of the bind _3A formed by the first and second bind layers 3A ₁ and 3A ₂ formed of the first and second glass bind tapes 3a 1 and 3a ₂ . Therefore, it is possible to obtain a bind 3A in which the generation of varnish cured products on its surface is prevented. In this way, since no varnish cured product is generated on the surface of the bind 3A, there is no concern that cracks will occur due to the varnish cured product during the heat cycle caused by starting and stopping the rotating electrical machine, and the resulting co-cracking of the bind 3A will improve reliability. Excellent binding 3A can be obtained. Further, since the cured varnish does not adhere to the surface of the bind 3A, there is no need to remove the cured varnish.

Note that even if the material of the second glass bind tape that is not impregnated with varnish is the same as the material of the first glass bind tape that is impregnated with varnish, or even if it is made of a different material, the amount of varnish that flows out of the first glass bind tape will be reduced. It may be any material as long as it maintains appropriate strength after curing.

〔Effect of the invention〕

As described above, the present invention is directed to the production of a binding for a rotating electrical machine that is capable of preventing the formation of varnish cured substances on its surface. How can you get it?

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional side view of the end of a rotor winding according to an embodiment of the method for manufacturing a binding for a rotating electric machine of the present invention, and FIG. FIG. 3 is a longitudinal side view of the end of the rotor winding, showing the state of the binding when it is manufactured by a conventional method for manufacturing a binding for a rotating electrical machine. FIG. 4 is a longitudinal sectional side view of the end of the rotor winding. FIG. 3 is a longitudinal cross-sectional side view of the rotor winding end according to the manufacturing method. DESCRIPTION OF SYMBOLS 1... Rotor core, 2... Rotor winding, 3A... Bind, 3a ₁ ... Wrapped first glass bind tape, 3a ₂ ... Wound second glass bind tape, 3A ₁ ... First binding layer, 3A ₂ ...second binding layer.

Claims (1)

[Claims] 1. In a method for manufacturing a binding for a rotating electric machine that is wrapped around the outer periphery of an end of a rotor winding protruding from a rotor core and holds the end of the rotor winding, the bind A first glass bind tape impregnated with a solvent-free varnish is wound around the first glass bind tape, and then a second glass bind tape not impregnated with a solvent-free varnish is placed on top of the wound first glass bind tape. Wrapping, these first and second
A method for manufacturing a binding for a rotating electric machine, characterized in that a glass binding tape is heat-cured at once.