JPS6037697B2 - Core manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method of manufacturing a split core constituting a stator of a motor.

The problem with motors using stators made of toroidal cores is that toroidal winding is difficult and workability is poor.
In order to avoid such problems, a method has conventionally been adopted in which the stator core is formed by split cores.

FIGS. 1 and 2 are diagrams for explaining a method of manufacturing a stator core using divided cores of subordinates.

In order to obtain the slotted stator core split core 3 having the shape shown in FIG. 1, a large number of iron plates are sequentially layered and formed integrally by welding, etc., and the obtained split core 3 is insulated. As shown in FIG. 2, windings 2 are applied to each slot, assembled into a case, and a rotor 4 is inserted. However, according to such prior art, the magnetic resistance increases due to the provision of slots and the core division, resulting in a 1.
Static coking during rotation increases.

As another conventional technique, as shown in FIG. 4, a three-part core 5, 6, 7 processed or formed into a C-ring shape is used, and the winding is wound on a bobbin or the like, and the core notch 8, as shown in the figure, is used.
There is a method of shifting 9 and 10 by 120 degrees and fixing them. However, even with such a method, it is difficult to reduce static coking, and it is also difficult to avoid deterioration of characteristics due to increased magnetic resistance. The present invention has been made in order to eliminate such drawbacks of the prior art, and includes notches provided at both upper and lower ends of a cylindrical core material, and cutouts at a predetermined angle with respect to the center line of the cylindrical core material. A pair of split core materials are obtained by cutting along a line connecting the respective pros and cons at an angle, and after inserting a winding wire from the cut portion of the split core material, the cut portion of the pair of split core materials is cut. The core is manufactured by combining the two.

The present invention will be described below with reference to embodiments shown in the drawings.
First, a long cylindrical core material, for example, the pipe-like core material 14 shown in FIG.
Notches 1, 2, 13, etc. are provided.

Then, the centers of notches 1 and 21 were cut at a dimension 13 from the lower end surface, and a single piece with notches 12 and 13 provided at both upper and lower ends of the shape as shown in Fig. 8 was formed. A cylindrical core material 15 is obtained. Next, as shown in Fig. 6, the center line 1
The diagonally shaded portion is cut out from the cylindrical core material 15 along the straight line connecting the inner end surfaces of the notches 12 and 13 at an oblique angle of ■o to 1, thereby dividing it as shown in FIG. A pair of core members 16 and 17 are obtained, and the cut portions of the split core members 16 and 17 are brought together to form a core.
In this case, especially when a ferrite material is used as the core material, notches can be easily provided in advance as shown in FIG. 8, and a desired cylindrical core can be obtained without changing the inner and outer dimensions.

Moreover, the cut surface is diagonal, so as shown in Figure 10,
Static coking during rotation can be significantly reduced.
To wind the split core 18, as shown in FIG. 9, the bobbin 20 on which the winding 19 has been applied is inserted into the core members 16 and 17 through the core cut portion, and then both core parts are separated. make a mess

Note that the notch may be provided in advance in the cylindrical core material as described above, or the portion corresponding to the notch may be removed after cutting.

As described above, according to the present invention, since the cut surface is provided diagonally to obtain the split core from the cylindrical core material, static coking can be significantly reduced compared to the conventional core provided with slots, and the split core Since a bobbin or the like having wire wound thereon is inserted and the cut surfaces of the split cores are aligned and fixed, it is easy to attach the winding wire to the core, resulting in improved workability.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a conventional split core, Fig. 2 is a diagram showing a schematic structure of a stator made of this split core, and Fig. 3 is a diagram showing the structure of a motor using the conventional split core during one rotation. A characteristic diagram showing static coking, FIG. 4 is a perspective view showing another example of a conventional split core, and FIGS. 5 to 9 are diagrams for explaining an embodiment of the split core manufacturing method of the present invention. FIG. 10 is a characteristic diagram showing static coking during one rotation of a motor using a split core manufactured by the method of the present invention. 12, 13: Notch, 14: Core material, 15: Core split material, 16, 17: Core member, 18: Split core, 19: Winding wire, 20: Bobbin o Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] 1 Notches are provided at both the upper and lower ends of the cylindrical core material, and a pair is cut by cutting along a line connecting the respective notches at a predetermined angle of inclination to the center line of the cylindrical core material. A method for manufacturing a core comprising obtaining a split core material, inserting a winding through the cut portion of the split core material, and then combining the cut portions of the pair of split core materials.