JPS6169346A - Stator winding of rotary electric machine - Google Patents

Abstract

PURPOSE:To rationalize the insulating work by enclosing a stator coil made of a double coated film flat wire formed with a powder insulator layer on an enameled film layer with a sheetlike insulator mounted in a stator slot. CONSTITUTION:A synthetic enameled film layer 8 of polyester resin is coated and seived on the outer periphery of a flat lead 7, and a double coated film flat wire 12 formed by coating epoxy powder resin, heating to fusion-bond and curing is wound in a hexagonal shape to form a stator coil 11. Sheetlike insulators 14 formed by adhering a lumped mica powder are mounted at both sides of the film are mounted in a stator core slot 5. The coil 11 is contained in the slot 5, enclosed with the insulators 14, and then secured by a wedge 6. Then, epoxy nonsolvent resin is impregnated in vacuum, heated and cured and integrated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention includes, for example, 3. This invention relates to stator windings for OkV class high voltage rotating electric machines, and particularly to improvements in insulation means.

[Technical background of the invention and its problems] Fig. 4 is a cross-sectional view of a conventional stator winding of this kind housed in a stator core slot. coil 1
In this example, a rectangular enameled wire 2 is wound in a hexagonal shape, an interlayer insulator 3 is inserted to increase the dielectric strength between the left and right rectangular enameled wires 2, and then mica is applied to the outer periphery of the rectangular enameled wire 2 wound in the hexagonal shape. It has a structure in which an inter-ground insulating layer 4 is formed mainly of tape. Then, the stator coil 1 is housed in the stator core slot 5 as shown in FIG. The entire stator winding is constructed by impregnating the inside of the inter- and inter-ground insulating layer 4, heating and curing it, and integrating it.

The rectangular enameled wire 2 may have an enamel coating layer 8 formed by applying and baking a synthetic resin such as polyester resin on the outer peripheral surface of the rectangular copper wire 7 (J, as shown enlarged in FIG. A protective coating layer (not shown) made of glass m fiber or the like is applied on the enamel coating layer 8.

Conventional stator windings made of 4M in this way have been put into practical use without any problems in terms of quality and functionality (equivalent to J). It is necessary to form the inter-ground insulating layer 4 using tape material.
[In order to improve the dielectric strength of the rectangular enameled wire 2, the interlayer insulator 3 must be inserted, which complicates the work process and poses many problems both economically and in terms of productivity.
A streamlined means of insulation was desired.

[Object of the Invention] The object of the present invention is to provide a stator winding for an N-rotation machine that can streamline insulation work, improve economical and productivity aspects, and further improve insulation performance. It is about providing.

[Summary of the invention]

In order to achieve the above object, the present invention is characterized by the following configuration. In other words, a stator coil made of a double-coated rectangular wire with a powder insulating layer formed on the enamel coating layer of the rectangular enameled wire is installed in the stator core slot. The stator coil wrapped in the sheet-like insulator is impregnated with a synthetic resin, and the sheet-like insulator and the stator coil are integrated into the slot. It is characterized by being fixed to.

(Embodiment of the Invention) FIGS. 1 and 2 are diagrams showing an embodiment of the present invention, and FIG. 1 is a cross-sectional view showing the configuration of the stator winding housed in the stator core slot 5. FIG. 2 is an enlarged sectional view showing the structure of the double-coated rectangular wire forming the stator coil. In addition, Fig. 4.

Components that are the same as those in FIG. 5 are designated by the same reference numerals, and detailed explanations will be omitted. In FIG. 1, reference numeral 11 denotes a stator coil, which is constructed by winding a double-coated rectangular wire 12 in a hexagonal shape. The double-coated rectangular wire 12 is made by applying and baking a synthetic resin enamel coating layer 8 made of polyester resin or the like to a thickness of 0.03 mm or more as an insulating layer on the outer peripheral surface of a rectangular copper wire 7 as shown in FIG. Furthermore, an epoxy powder resin is coated on the outer peripheral surface of this synthetic resin enamel coating layer 8 for the purpose of insulation reinforcement and mechanical protection, and is cured by heat fusion.
It has a structure in which a powder insulating layer 13 with a thickness of 0.1 mm or more is formed.

Further, in FIG. 1, reference numeral 14 denotes a sheet-like insulator with a thickness Q of 0.13 mm or more, which is made by adhering aggregated mica powder to both sides of a polyester film with a thickness Q of 5 mm or more. It is attached to the shape of the letter. Note that the dielectric strength of the sheet-like insulator 14 is 15 kV or more.

Thus, the stator coil 11 is connected to the stator core slot 5.
After being stored in the inner chamber as shown in FIG. ! ! 6, and then impregnated with epoxy-based solvent-free resin under vacuum pressure and heat-hardened to be integrated, thereby forming the entire stator winding.

On the other hand, the coil end portion 20 protruding from the stator core slot 5 is connected to the coil 1 as shown in the external view of FIG.
Shallow area characteristics (such as glass fiber tape with a thickness of 0.1 mm or more on the outer peripheral surface of 1).

Excellent heat resistance and synthetic resin impregnation properties! ! The navy blue tape 21 is wound one or more times with 1/2 overlap, and the synthetic resin impregnated into the gaps between the wires is prevented from flowing out during heating and curing, filling the space between the wires and filling the stator coil 11. In order to achieve fixation, the heat-absorbing polyester film tape 22 is wound one or more times with a 1/2 overlap.

As described above, in this embodiment, the stator coil 11 is a double-coated rectangular wire 12 in which a powder insulating layer 13 having a thickness of 0.1 mm or more is formed on the outer peripheral surface of a conventional rectangular enameled wire 2.
It is constructed by winding. Here, the double-coated rectangular wire 12 has a dielectric strength approximately 1.5 times that of the conventional rectangular enamelled wire 2 alone, and an insulation strength that is 2 to 3 times greater between wires in the stator state. It has characteristics. Therefore, the dielectric strength of the portion corresponding to the coil interlayer insulation portion is completely comparable to that of the conventional one.

The coating thickness of the powder insulating layer 13 can be freely controlled, making it easy to obtain a coating of the desired thickness, and the coating itself has excellent mechanical strength and flexibility. There is an advantage of being there. In addition, in this embodiment, the gap between the stator coil 11 and the stator core throwers 1 to 5 is made of a polyester film composite material having a laminated mica layer with excellent resin impregnation on both sides, and has a dielectric strength of 1.
A high-performance sheet-like insulator with a voltage of 5 kV or more is provided, and an expository resin is impregnated and cured into this to a state that eliminates the above-mentioned gap. Therefore, stator core thrower 1~
The various insulation properties of the stator winding, such as corona properties, alternating current properties, and alternating current dielectric breakdown properties, are determined by the interlayer insulator 3 or Even without using insulating means such as the ground-to-ground insulating layer 4, which requires a complicated work process, performance equivalent to or better than that of the conventional method can be achieved by 1q. This point was confirmed experimentally. Thus, reasonable insulation work is carried out74. In addition, improvements can be made both economically and in terms of productivity. In addition, set training ten,
There are also effects such as an improvement in the space factor within the stator core slots 5.

Note that the present invention is not limited to the above embodiments.

For example, in the above embodiment, the stator coil 11 is shown as a uniformly wound coil wound in a hexagonal shape, but the same effect can be obtained with a randomly wound coil. It goes without saying that various other modifications can be made without departing from the gist of the present invention.

〔Effect of the invention〕

As described in detail below, according to the present invention, a stator coil made of a double-coated rectangular wire in which a powder insulation layer is formed on the enamel coating layer of the rectangular enameled wire is inserted into the stator core slots l to 1. The stator coil is wrapped in a sheet-like insulating material with high corona resistance, insulation properties, and resin-impregnated properties, and the stator coil wrapped in the sheet-like insulating material is impregnated with a synthetic resin.
The sea 1-shaped insulator and the stator coil are connected to the thrower I.
・Since the stator windings of rotating electric machines are fixed integrally within the interior, the insulation work is streamlined, improving both economy and productivity, and further improving insulation performance. can be provided.

[Brief explanation of the drawing]

1 to 3(a) and 3(b) are diagrams showing an embodiment of the present invention, and FIG. 1 shows the configuration of the stator winding housed in the stator core thrower 1. 2 is an enlarged sectional view showing the structure of the double-coated rectangular wire; FIGS. 3A and 3B are external views showing the insulation state of the coil end;
4 and 5 are views for explaining the conventional example, and FIG. 4 is a sectional view showing the structure of the stator winding housed in the stator core slot. FIG. 5 is an enlarged sectional view showing the structure of the rectangular enameled wire. 5...Stator core thrower 1~. 6... wedge, 7...
Flat copper wire, 8...Synthetic resin enamel coating layer, 11...
・Stator coil, 12...Double coated flat wire, 13...
- Powder insulation layer, 14...C]-shaped insulator, 21...
- Fiber tape, 22...Heat-absorbing polyester film tape. Applicant's agent Patent attorney Takehiko Suzue = 9- Figure 1 Figure 3 Figure 4 Figure 2 (b) Figure 5

Claims (1)

[Claims] A stator coil made of a double-coated rectangular wire with a powder insulating layer formed on the enamel coating layer of the rectangular enameled wire, and a corona-resistant structure that wraps the stator coil in the stator core slot. A sheet-like insulator with high insulating properties and resin-impregnated property, and the stator coil wrapped in the sheet-like insulator are impregnated with a synthetic resin and cured, and the sheet-like insulator and the stator coil are placed in the slot. A stator winding for a rotating electric machine, characterized in that it is provided with means for integrally fixing.