JPH08205447A - Manufacture of bind ring for cylindrical rotor - Google Patents

Abstract

PURPOSE: To prevent discharge from the surface of a conductive bind ring by applying an insulation coating to the entire surface of the conductive bind ring. CONSTITUTION: A bottom coil 5a is set, through a dimension adjusting member 6, on a support 4 fixed to a rotor 1 and a prescribed number of insulation sheets are applied thereon. It is then impregnated with an epoxy resin to produce an insulation 12a under the bind and a piano wire is wound around the insulation 12a to produce a bind ring 7a. The insulation 12a under the bind is then turned up partially and applied with an insulation coating such that the surface of the bind ring 7a is not exposed. Subsequently, the epoxy resin is thermally hardened in order to strengthen the insulation 12a under the bind through integral bonding. Similarly, an upper coil 5a is set on the insulation 12a under the bind of the bottom coil 5a and an insulation 12b under the bind and a bind ring 7b are wound around the upper coil 5b. The insulation 12b under the bind is then turned up and the epoxy resin is thermally set thus completing the insulation 12b under the bind of the upper coil 5b.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for manufacturing a cylindrical rotor binding ring.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional example of an end portion of a cylindrical rotor. Rotor 1 as shown in the drawing
Since a centrifugal force generated by the rotation of the iron core 3, the metallic support 4, the coils 5a, 5b, etc. is applied to the coil end 2 of the above, stress is applied to the coils 5a, 5b, and the coils 5a, 5b are deformed. Insulators against the stresses are applied to the coils 5a and 5b, but if this deformation exceeds the allowable strain and stress of the insulators, the insulators are destroyed and the coil 5a
The a and 5b are short-circuited with the iron core 3 or the earth potential part such as the metal support 4 and the rotor 1 is destroyed, and in the worst case, the rotating electric machine cannot operate.

In order to cope with such a situation, the binding rings 7a and 7b are currently properly attached and fixed to the coil end portion 2 to prevent the coils 5a and 5b from being deformed. The bind rings 7a and 7b are formed by curing a metal bind ring, a metal bind wire, or a non-metallic fiber impregnated with a curable resin.

However, these binding rings 7
When a conductive binding ring made of metal or carbon fiber is exposed on the surface of a and 7b, the coils 5a and 5b
The voltage applied to the binding rings 7a and 7b is induced by the dielectric sharing, and the binding rings 7a and 7b are induced.
Air discharge or discharge short circuit may occur from the surface of a, 7b to the surrounding earth potential part (iron core 3, metal support 4, stator, etc.), and in the worst case, operation may be stopped due to air discharge short circuit. There is concern and it is not preferable for the operation of the rotating electric machine.

As a cylindrical rotor, Japanese Examined Patent Publication Sho 58-18868
The gazette can be mentioned.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of manufacturing a bind ring for a cylindrical rotor, which prevents discharge from the surface of the conductive bind ring.

[0007]

The above object is achieved by insulatingly coating the entire surface of the conductive binding ring so that it is shielded from air.

The insulating coating may be formed by organic fiber, film, inorganic fiber, mica, etc., alone or in combination, and integrally fixed with an adhesive.

[0009]

Since the above means is provided, it is possible to prevent damage to the rotating electric machine such as short circuit discharge from the surface of the binding ring to the peripheral low potential portion.

That is, by covering the surfaces of the bind rings 7a and 7b with an insulating coating, the iron core 3 and the metallic support 4, the iron core 9 of the stator 8 and the coil 10 which are low potential parts around the surfaces of the bind rings 7a and 7b are surrounded. Since it is possible to completely prevent air discharge to the rotor, high reliability of the rotor can be obtained, and safety of operation of the rotating electric machine can be ensured.

[0011]

【Example】

(Embodiment 1) As shown in FIG. 1, a bottom coil 5a is arranged on a support body 4 attached to a rotor 1 through a glass mica sheet and a dimension adjusting material 6 impregnated with a curable epoxy resin. An insulating sheet (thickness 0.18 mm) in which a polyimide film and a mica sheet are laminated on this coil 5a.
) Is repeated a predetermined number of times to apply under-bind insulation 12a by epoxy resin impregnation. A non-magnetic Viano wire is wound under the binding insulation 12a under a predetermined tension to bind the binding ring 7.
Obtain a. After that, a part of the binding lower insulation 12a applied earlier is folded back to cover and insulate the binding ring 7a so that the surface thereof is not exposed. The under-bind insulation 12a is heated at 130 ° C. or higher for 15 hours to harden the epoxy resin to complete the bottom-coil under-bind insulation 12a in order to strengthen the adhesion.

Similarly to the above, the upper coil 5b is connected to the bottom coil 5a.
It is arranged on the binding lower insulation 12a and the binding lower insulation 12b, the binding ring 7b is wound, and the binding lower insulation 12
Turn back b and cure the epoxy resin by heating,
The binding lower insulation 12b of the upper coil 5b is completed. After this, the coil end portion 2 of the upper coil 5b and the bottom coil 5a
Binder insulation 12a, 12b obtained by joining and insulating
The discharge characteristics and the withstand voltage of the bound rings 7a and 7b subjected to the above were evaluated. With respect to the test conditions, a voltage of AC23KV was held for 10 minutes in the coil conductor while a surface pressure of 400 kg / cm ² was applied to the binding lower insulation 12b of the upper coil 5b, and then the voltage was further increased to measure the breakdown voltage.

As a result, even if 50 kV is applied, a discharge short circuit does not occur from the binding materials 7a and 7b to the iron core 3, the metal support 4 and the like in the surrounding earth potential portion, and the binding under insulation 12a,
The soundness of 12b was confirmed.

Further, in this state, at 155 ° C to 180 ° C, 1
After being deteriorated for 5 days, a destructive test was performed under a surface pressure as described above, but no abnormality such as a discharge short circuit was observed even after applying 50 kV, and the high reliability of the under-bind insulation 12a, 12b was confirmed.

In order to compare with the first embodiment, the binding materials 7a and 7b, the iron core 3, the metal support 4 and the like having the same construction as the first embodiment are used to show the under-bind insulation 12a 'and 12b' as shown in FIG. The integrity of the coil end portion was evaluated by obtaining the under-bind insulation in the conventional method in which the entire surface was not covered with insulation. In the evaluation test, as in Example 1, when the surface pressure was 400 kg / cm ² and the voltage was applied to the upper and bottom coil conductors to raise the voltage, the binding material 7b was short-circuited from the binding material 7b to the iron core 3 and a voltage higher than that was applied. It was impossible. Furthermore, a carbonization route due to a discharge short circuit was confirmed on the insulating surface.

[0016]

EFFECTS OF THE INVENTION According to the present invention, a binding ring having an excellent withstand voltage can be obtained. Therefore, a method for manufacturing a binding ring for a cylindrical rotor, which has an ever-increasing capacity and is compatible with high voltage rating specifications, will be provided. Can be provided.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of a bind ring and the like of a coil end portion of a cylindrical rotor of the present invention.

FIG. 2 is an explanatory view showing a configuration of a bind ring and the like of a coil end portion of a conventional cylindrical rotor.

[Explanation of symbols]

1 ... Rotor, 2 ... Coil end, 3 ... Iron core (rotor),
4 ... Metal support, 5a ... Bottom coil, 5b ... Top coil, 6
... Dimension adjustment material, 7a ... Bottom coil binding ring, 7b ...
Upper coil bind ring, 8 ... Stator, 9 ... Iron core (stator), 10 ... Stator coil, 11 ... Stator coil end, 12a ... Bottom coil bind lower insulation, 12b ... Upper coil bind lower insulation.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiro Yasaka 3-1-1, Saiwaicho, Hitachi-shi, Ibaraki Hitachi Ltd. Hitachi factory

Claims (4)

[Claims] 1. A method of manufacturing a binding ring for a cylindrical rotor, wherein a coil end portion of a coil incorporated in a groove of an iron core, the coil end portion projecting outward from the groove of the iron core is fixed by a conductive binding material. A method for manufacturing a binding ring for a cylindrical rotor, characterized in that the surface of the binding material is insulation-coated. 2. A method of manufacturing a binding ring for a cylindrical rotor, comprising a magnetic or non-magnetic metallic binding as the conductive binding material according to claim 1. 3. A method for manufacturing a bind ring for a cylindrical rotor containing carbon fiber as the conductive binding material according to claim 1. 4. A part of the conductive binding material according to claim 1, which is made of aramid fiber, polyarylate fiber, polyester fiber, ultra high molecular weight polyethylene fiber, silicon nitride fiber, silicon carbide fiber, alumina fiber, or the like. A method of manufacturing a binding ring for a cylindrical rotor, in which conductive binding materials are used alone or in combination.