JPH0710151B2 - Stator core of rotating electric machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator core of a rotary electric machine formed by being divided into a plurality of pieces.

[0002]

2. Description of the Related Art As shown in FIG. 4, a stator core of a rotating electric machine formed of a plurality of divided iron cores serves as a connecting portion on a divided surface 2 of an iron core 1 as shown in FIG. The interlocking projections 2a, 2b are formed, or as shown in FIG. 5, the split surface 2 of the iron core 1 is formed with a dufftail-shaped projection 2c and a groove 2d as a connecting portion, and the split iron core 1 is divided. The stator core was formed by joining the cores at the split surface 2.

[0003]

However, in the stator core using these division / coupling methods, since the shape of the joint portion of the division surface 2 of the iron core 1 becomes complicated, burrs are likely to occur during punching of the core plate. Therefore, it is difficult to align the inner diameter side of the stator core in a perfect circle due to the unevenness due to a and burrs, and unevenness occurs in the gap with the rotor. b) It is difficult to bring the joints into close contact with each other, so that air gaps tend to be generated between the two divided surfaces, resulting in an increase in magnetic resistance. There are problems such as a significant drop in efficiency.

The present invention has been made in view of such circumstances, and expands the magnetic path area of the joint portion of the iron core to reduce the magnetic flux density, and makes the split surface substantially flat to obtain the magnetic resistance of the joint portion. To improve the magnetic efficiency and to facilitate joining by welding.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a tooth portion is formed on the inner diameter side of an iron core, and a distal end is formed radially outward of the position of the tooth portion to form an extending portion. The problem is solved by forming a substantially flat split surface in the radial direction that penetrates the portion to divide the iron core into a plurality of portions and enabling the joining at the split surfaces.

[0006]

In the divided iron core, the windings can be easily wound around the yoke portion, and after the joining of the divided portions, the resistance to the flow of the magnetic flux becomes high in the divided portions. However, since the protrusions are formed radially outward at the split parts, the contact area due to coupling is large, the density of the magnetic flux flowing to the yoke is low at the coupled parts, and the magnetic flux density at the yoke is high. As a result, the increase in the magnetic resistance is reduced.
Furthermore, when the tips of the protrusions are welded and joined together, a certain distance is created between the tips of the protrusions and the windings, so that the adverse effects of welding on the windings are reduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. FIG. 1 is a diagram showing the shape of a stator core of the present invention, and FIG. 2 is its divided state. FIG. 3 is an enlarged view of an essential part and FIG. 3 is a diagram showing a state of a magnetic path in a coupling portion.

In FIG. 1, FIG. 2 and FIG. 3, the stator core is formed by joining and fixing two divided iron cores 1 at split surfaces 2.

The dividing surface 2 is formed to be substantially flat, and the iron core 1 is divided by the tooth portion 3 and the dividing surface 2
The extending portion 4 is formed to extend radially outward along the. The extending portion 4 is formed so that its tip is thin, and the tip is easily welded.

As shown in FIG. 1, the respective iron cores 1 are abutted with the dividing surfaces 2 and positioned with reference to the inner diameter side 3a of the tooth portion 3, and the dividing surfaces 2 are adhered or extended by adhesion or the like. The stator core is formed by joining and fixing the parts 4 by welding or the like.

According to the above construction, the cross-sectional area of the joint portion of each iron core 1 increases by the cross-section integral of the extension portion 4, so that the magnetic path of the magnetic flux Φ widens as shown in FIG. The magnetic flux density can be reduced.

Therefore, since the density of the magnetic flux Φ passing through the dividing surface 2 becomes small, the influence of a slight air gap in the coupling portion is reduced and the loss is reduced. For example, the magnetic flux density of the magnetic flux passing through the normal iron core 1 is 16000 to 20000.
G (Gauss) is extremely high, but the magnetic flux density at the coupling portion is 8000 to 10000G due to the formation of the extension portion 4.
Therefore, the effect of reducing the magnetic flux loss is great.

Further, since the dividing surfaces 2 are formed flat, there is little influence of burrs upon joining the dividing surfaces 2 and the two can be easily brought into close contact with each other, so that the gaps at the joint portions become small and the magnetic field is reduced. The resistance can be significantly reduced. Further, since the respective iron cores 1 can be positioned and fixed on the basis of the inner diameter side 3a of the tooth portion 3 of the iron core 1, the inner circumference of the stator iron core can be made almost a perfect circle, and the gap between the iron core 1 and the rotor can be reduced. It can be aligned almost uniformly.

Then, each iron core 1 can be securely fixed by welding the extending portion 4, or in the molded motor in which the stator is integrally molded with resin to form a frame, Since the area of 2 is large, sufficient temporary fixing can be performed only by adhering each.

Particularly, in joining by welding, by forming the tip of the extending portion 4 to be thin, the portion of the tip which is thinned by welding is melted and reliable welding can be performed. When the coil is directly wound around the iron core 1 in the divided state, the extending portion 4a
The winding work is facilitated because mounting, positioning and fixing to the winding machine can be performed with reference to.

[0016]

As described above, the gist of the present invention resides in that in the iron core divided into a plurality of portions, the extending portion extending radially outward along the dividing surface is formed.
This can be appropriately performed regardless of the shape of the stator core and the number of divided parts. Further, according to the present invention, it is possible to obtain a stator core of a rotary electric machine in which split cores are easily coupled and magnetic loss is small.

[Brief description of drawings]

FIG. 1 is a view showing a shape of a stator core according to the present invention.

FIG. 2 is an enlarged view of an essential part showing a divided state of a stator core according to the present invention.

FIG. 3 is a diagram showing a magnetic path state of a divided portion of a stator core according to the present invention.

FIG. 4 is a view showing a connecting portion of a conventional stator core.

FIG. 5 is a view showing a connecting portion of a conventional stator core.

[Explanation of symbols]

 1 ... Iron core 2 ... Dividing surface 3 ... Tooth portion 4 ... Extension portion

Claims (1)

[Claims] 1. A tooth portion is formed on the inner diameter side of an iron core, and a tip is narrowed radially outward of the position of the tooth portion to form an extended portion, and a radial direction that penetrates the extended portion and the tooth portion. A stator core of a rotary electric machine, characterized in that a substantially flat split surface is formed to split the iron core into a plurality of pieces, and the split surfaces can be joined.