JPS61147750A - Resin-molded stator - Google Patents

Abstract

PURPOSE:To eliminate the exposure of a coil surface within a bolt inserting hole by molding in the state that a pin for forming the bolt inserting hole is coated with a cylindrical member, and integrally burying the member in the resin. CONSTITUTION:A stator core 11 wound with a stator coil 12 is mounted in molds 17, 18, and molded in the state that a cylindrical member 15 is coated on the periphery of a pin 16 for forming a bolt inserting hole extending from the mold 18. The member 15 is integrally secured into the molding layer 13 at molding resin curing time. Thus, it can completely prevent the end of the coil 12 from exposing in the bolt inserting hole to effectively prevent the insulating performance from decreasing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a resin molded stator in which a stator coil is molded from an insulating resin.

[Technical background of the invention 1] The structure of a conventional resin molded stator will be explained with reference to FIG. 3, which shows a mold together with a mold. 1 is a stator core, and 2 is a slot (not shown) in the stator core 1. 3 is an insulating resin mold layer formed to cover the stator coil 2; 4 is a stator core 1 for fixing a bearing bracket (not shown) to the stator core 1;
Bolt insertion holes 5 are formed in the mold layer 3 so as to be continuous with the bolt insertion holes 4.

When molding the stator with the above configuration, the stator core 1 with the stator coil 2 attached is housed in the molds 6 and 7, and the pins 8 provided in the molds 6 and 7 are bolted together. With the stator core 1 inserted into the insertion hole 4 and positioned, insulating resin is injected into the mold 6.7 through the gate 9 to form the mold layer 3, and at the same time, the pin 8 is used to inject the mold layer 3 into the mold layer 3. A bolt through hole 5 is formed.

[Problems in the Background Art] When injecting insulating resin into the molds 6 and 7, the coil end portion of the stator coil 2 receives the injection pressure of the insulating resin vigorously injected from the gate 97)S. deformed, third
As shown in the figure, it may come into contact with the pin 8. In this case, after the molding is completed, the coil end part is inserted into the bolt through hole 5.
The through bolt (not shown) inserted into the bolt through hole 5 when assembled as a motor will be exposed inside.
There was a problem in that the coil end and the coil end came into contact, causing poor insulation.

``Object of the Invention'' The present invention has been made in consideration of the above-mentioned circumstances, and therefore, its purpose is to reliably prevent the stator coil from being exposed in the bolt through hole of the mold layer, and to insulate the stator coil. An object of the present invention is to provide a resin molded stator that can improve performance.

[Summary of the Invention] The present invention involves placing a cylindrical member over a pin of a mold and molding this cylindrical member together with a stator coil, thereby forming a cylindrical shape on the inner surface of a bolt through hole formed in a mold layer. This cylindrical member prevents the stator coil from being exposed.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
stator coil installed in the slot (not shown), 1
3 is a molded layer of insulating resin formed to cover the stator coil 12, 14 is a bolt insertion hole formed in the stator core 1 so as to extend in the axial direction (vertical direction in the figure), and 15 is a bolt insertion hole formed in the bolt insertion hole 14. The bolt through holes 16 formed in the mold layer 13 in a continuous manner are cylindrical members provided on the inner surface of the bolt through holes 15, and the cylindrical members 16 are made of, for example, polyester, polyimide, or brimix.

It is made of insulating resin such as phenol or PBT.

To explain the molds for molding the stator with the above configuration, 17 and 18 are molds that can be separated into upper and lower parts, and the lower mold 17 is used to house the stator core 11. The upper mold 18 is provided with an annular recess 20Ifi for forming the mold layer 13, and a spool 21 for injecting the insulating resin. A gate 22 is provided to open the inner peripheral portion of the recess 20. The drawing molds 17 and 18 are each provided with pins 23 that are inserted into the bolt insertion holes 14 of the stator core 11.

Next, a procedure for molding the stator of this example will be explained. First, the image forming molds 17 and 18 are opened and all the pins 23 are covered with the cylindrical members 16, respectively. Thereafter, the stator core 1 with the stator coil 12 attached thereto is housed in the recess 19 of the lower mold 17, and the mold is closed.

At this time, the pins 23 of the drawing molds 17 and 18 are respectively inserted into the bolt insertion holes 14 of the stator core 11, thereby positioning the stator core 11. After closing the mold, apply an insulating resin such as premix or phenol.

Spool 21 of epoxy, nylon, and PBT'W resin.
The four parts 19 of the drawing mold 17 and 18 through the gate 22
．． If injected into the stator coil 12 and hardened, the stator coil 12
Both the cylindrical member 16 and the cylindrical member 16 are molded with insulating resin. After molding, when the molds 17 and 18 are opened and the stator core 11 is taken out, the stator coil 12 is covered with the mold layer 13 and the cylindrical member 16 is covered with the pin 23.
The stator is pulled out from the mold layer 13 and fixed to the inner surface of the bolt through hole 15 of the mold layer 13, thereby completing the stator.

In the case of this embodiment, since the cylindrical member 16 is provided on the inner surface of the bolt through hole 15, the coil end portion of the stator coil 12 is bent toward the pin 23 by the injection pressure of the insulating resin during molding. Even if the coil end portion is deformed, only the narrow coil end portion contacts the cylindrical member 16, and this coil end portion is not exposed inside the bolt through hole 15. Therefore, insulation defects caused by the coil end portion coming into contact with a through bolt (not shown) pushed through the bolt through hole 15 can be reliably prevented.

The present invention is not limited to the embodiments described above and shown in the drawings. For example, the base end portion (upper end portion) of the pin 23 of the upper mold 18 may be formed into a slightly tapered shape. Various modifications are possible, such as a structure in which the cylindrical member 16 may be temporarily held at a portion.

[Effects of the Invention] As is clear from the above description, the present invention provides a cylindrical member molded with an insulating resin together with the stator coil on the inner surface of the bolt through hole of the mold layer.
The stator coil can be reliably prevented from being exposed in the bolt through hole, and the insulation of the stator coil can be improved.

Moreover, since such a sharp effect can be obtained simply by covering the pin of the mold with the cylindrical member, an excellent effect is obtained in that the manufacturing cost is hardly increased by -F.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention,
FIG. 1 is an enlarged vertical cross-sectional view of the main part, FIG. 2 is a vertical cross-sectional view of the whole, and FIG. 3 is a view corresponding to FIG. 1 showing a conventional example. In the drawing, 11 is a stator core, 12 is a stator coil, 1
3 is a mold layer, 14 is a bolt insertion hole, 15 is a bolt through hole, 16 is a cylindrical member, 17 and 18 are molds, and 23 is a pin. Applicant Toshiba Corporation Figure 1 No. 2 Sai 3 No. 691 4ES

Claims (1)

[Claims] 1. A stator core having bolt insertion holes and a stator coil attached to the stator core are housed in a mold, and the stator coil is molded with an insulating resin injected into the mold, and A bolt through hole connected to the bolt insertion hole of the stator core is molded in the mold layer of the insulating resin by a pin provided in the mold, wherein an inner surface of the bolt through hole is provided with a pin of the mold. A resin molded stator comprising a cylindrical member which is covered with the stator coil and molded with the insulating resin.