JP3575199B2 - Method of manufacturing stator for resin-molded electric motor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a stator of a resin mold electric motor used as a drive source of various home appliances.
[0002]
[Prior art]
A method of manufacturing a stator of a conventional resin-molded electric motor will be described with reference to FIG.
[0003]
In FIG. 2, reference numeral 1 denotes a stator core, which is not shown in the drawing and has windings applied to each stator core. Reference numeral 2 denotes a split surface of the stator core 1, and reference numeral 3 denotes a mold core . Conventionally, the divided surfaces 2 are joined to each other by welding, or two gates 4 for injecting and filling the resin are provided at two positions facing the divided surface 2 at 90 degrees. The divided surfaces 3 are brought into close contact with each other at an injection pressure of 1 to form a continuous circular stator, and the inner diameter accuracy of the stator is ensured.
[0004]
[Problems to be solved by the invention]
In the above-described conventional manufacturing method, when two stator cores 1 on which windings are applied are welded on the division surface 2, there is an advantage of high accuracy, but there is a disadvantage that welding requires a lot of man-hours.
[0005]
In addition, when the gate 4 is provided at two locations to inject the resin, the number of runner portions through which the resin flows increases, and the amount of resin waste increases, which is not preferable.
[0006]
In addition, since there is a gap between the mold and the stator core, there is a problem that the resin slightly enters the dividing surface 2 and the accuracy varies. Therefore, the present invention is intended to improve the inner diameter accuracy of a completed stator without increasing material costs and man-hours.
[0007]
[Means for Solving the Problems]
In order to solve the conventional problems described above, the present invention provides a stator core wound product obtained by applying a winding to a divided stator core, when filling and molding with resin , the core of the mold is used. A core having a plurality of small protrusions around the periphery thereof, and the small protrusions are slightly inserted into at least one of the slots of each stator core winding product, so that each stator core winding goods to those which would be positioned in a state that combines seen by the core in the mold, thereby even if the resin molding can be highly accurate stator finished products.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Continuous present invention, as the invention described in claim 1, is subjected to winding and the stator core winding products to each of the stator core is divided into a plurality, sets look combined the stator core windings article by when the resin molding in the the stator finished products, as a core in the mold to be inserted into the center of the stator core windings products in combination saw combined state, the core inside with a plurality of small projections on the outer periphery use at least inserted into one slot, the stator each stator core windings products combine seen set of a plurality of any of the stator core windings article slot small projection in said core after positioning of the stator core windings products at the time of constituting the finished product, after the mold is filled with a resin to each stator core windings products, the core in said mold from the stator completed It can be implemented by removing it.
[0009]
Therefore, the resin molding can be performed while reliably performing predetermined positioning of each of the divided stator cores in the mold by simple means.
[0010]
In addition, since the small protrusion provided around the center of the mold slightly enters the slot of each stator core to position each stator core, at least two or more plural cores may be used. There are no restrictions.
[0011]
The dimensions of the small projections are such that the core of the mold can be easily removed from the completed stator after resin molding, and each stator core is positioned at a predetermined position during resin molding. Any length is acceptable as long as it can be positioned.
[0012]
【Example】
An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, the windings applied to each of the divided stator cores are omitted, and the same components as in the conventional example shown in FIG. 2 are denoted by the same reference numerals as in FIG. 2, and detailed description is omitted. .
[0013]
In FIG. 1, reference numeral 5 denotes a small projection provided on the outer peripheral edge of the core 3 of the mold, which is inserted into a slot 6 of each stator core 1 on which a winding (not shown) is applied. Therefore, each of the two divided stator cores 1 is positioned at a predetermined position in the mold, and the resin does not enter the divided surface 2 and there is no variation in products. After the resin molding , the core 3 may be removed from the stator. Although FIG. 1 shows an example in which four small projections 5 provided on the outer peripheral edge of the core 3 are provided, the number of the small projections 5 is not limited to four and may be any number.
[0014]
Further, an example in which the division number of the stator core and two, the number of divisions but are not limited to two, but the more the number of small projections 5 The more the division number is usually In short, if the small core protrusions 5 are inserted into any of the divided slots 6 of the stator cores, the respective stator cores 1 can be positioned. If the small projections 5 are inserted into the slots 6 which preferably sandwich the split surface 2 of the stator core 1, resin is less likely to enter the surface in contact with the split surface 2. It is easy to achieve the purpose.
[0015]
【The invention's effect】
As described above, according to the present invention, the divided surfaces of the stator core are welded to each other and connected to each other as in the related art, or molded with a resin without the need to provide a plurality of diagonal gates on the divided surfaces. At this time, by inserting small projections provided on the outer peripheral edge of the core of the mold into one of the slots of each stator winding product, each stator winding product is positioned in the mold, A small and highly accurate stator finished product can be obtained.
[Brief description of the drawings]
FIG. 1 (a) is a cross-sectional view of a main part showing a pre-molding state of a completed stator of a resin-molded electric motor according to an embodiment of the present invention, and FIG. Cross-sectional view of a main part showing a state before molding of a completed stator of a conventional resin-molded electric motor.
DESCRIPTION OF SYMBOLS 1 Stator core 2 Dividing surface 3 Middle core 5 Small protrusion 6 Slot

Claims (1)

Subjected to winding the stator core windings products to each of the divided stator core into a plurality of resin molding in the circular stator finished product the stator core windings products are continuously aligned seen pairs In the method for manufacturing a stator of a resin-molded electric motor, in order to reduce the resin of the resin mold from entering the split surface of the combined surface of the stator core winding products and to improve the inner diameter accuracy of the completed stator product. A plurality of small protrusions are provided on the outer peripheral edge of the core of the mold when performing the resin molding, and when the core is inserted into the center of a state in which the stator core winding products are combined. The small projections are slightly inserted into the slots of the stator core so that each stator core is positioned, and when configuring the circular stator finished product , each stator core winding product is Combined before its center Insert the corrugated medium filled with a resin of the resin mold to each stator core windings products, fixed the wick after this filling of the resin mold motor, characterized in that it is detached from said stator Completed Child manufacturing method.

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