JPS5815441A - Stator iron core of rotary electric machine - Google Patents

Abstract

PURPOSE:To effectively utilize an iron core plate material and to reduce the using amount of the material by a method wherein roughly square-shaped iron core plates notched each angle section with suitable shape are punched for processing and the plates are stacked by successively shifting the plates by predetermined angles to make an iron core. CONSTITUTION:An iron core plate 8 is notched at each angle section A-D and punched in roughly square shape for processing. The notched sections are partitioned by a straight line or a curve passing through a point J having a larger diameter than a circular arc passing through the cross points E, F of each side generated when each iron core plate 8 is stacked by shifting a predetermined angle. One iron core 9 is made by shifting the plates 8 in the circumference direction by predetermined angles respectively. This minimizes the useless part of an iron core material and reduce the using material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator core for a rotating electrical machine that is improved so as to reduce the amount of core material used.

Conventionally, there has been an iron core of this type as shown in FIG.

In the figure, (1) is a stator core, which is formed by laminating thin steel plates having a circular or nearly circular outer diameter shape to an appropriate thickness. (2) is a stator frame in which the stator core (1) is fixed and housed by an appropriate method. (3) is a plurality of axial rigs formed on the stator frame (2).

The inner periphery of the stator core (1) is provided with grooves (4) of an appropriate number and size to accommodate the stator windings (5), and the outer periphery of the cylindrical stator core back. (1a) is set to have an appropriate thickness in the radial direction, and serves as a magnetic path for mainly passing magnetic flux in the circumferential direction.

Conventional stator cores have circular or nearly circular outer circumferences, so when they are punched out of strip-shaped thin steel sheets (6), they are fixed with a diameter as shown in Figure 2. The area of the material required to make one child core is D2 or more, and the area that becomes the punching waste (7) marked with diagonal lines in Fig. 2 is approximately 21.5% (°) of the material.

1-π/4so, 21s) or more.

This invention was made in order to improve the drawbacks of the conventional ones as described above, and by changing the outer peripheral shape of the stator core,
The aim is to provide a stator core that uses less core material by utilizing parts that were conventionally punched waste as part of the core.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIGS. 3 to 7V, (8) is a single iron core plate, which has an outer diameter shape with the hatched portions removed from each corner of a square. The details of the corner shape will be explained below with reference to FIG.

Draw two straight lines passing through the center of gravity O of the square ABCD and making an angle of 22.5° with the diagonal, and find the intersections with the sides of the square E and F.
shall be.

Draw an arbitrary straight line through 0/IOF and draw a straight line E1
The intersection point with ゛ is G, the intersection point with the arc passing through E and F is centered on O, and H is the intersection point with the arc passing through F. The curve BJF, which is the locus of point J on the extension of the straight line OGH, is 100G-2XOH is the iron core. This is the shape of the corner of the plate (8).

FIG. 4, FIG. 6, and FIG. 7 show a stator core using the above-mentioned core plate (8). In the figure, (9) is a fixed structure in which iron core plates (8) with diagonal lines cut out at each corner are laminated in the axial direction by sequentially shifting each plate by 45 degrees in the circumferential direction, as shown in Fig. 3. Child core, l'H)) is a clamper, (11) is a core rod whose ends are fixed to both clampers (10) I'IO) by welding, (12) is the stator core (9) mentioned above, The stator member includes a clamper (10), a core rod (11), a stator winding (5), and the like. (21) is a side plate of the stator frame (2).

Clampers (10) are applied to both ends of the stator core (9), which is formed by sequentially shifting and stacking core plates (9) one by one, and the core rods ( 1
1), and if necessary, weld the stator core (9) and core rod (
11) by welding a part of the contact part of the stator core (9),
The clamper (10) and the iron core rod (11) are fixed and integrated as shown in FIG. Next, the stator winding (5) is inserted into the integrated structure, and the stator member (12) is assembled.
form. The stator member (1
Insert and fix 2) into the stator frame (2) as shown in Figure 6,
In this embodiment, each core plate (8) has a radial dimension on the back of the core that is small in the straight portion of the outer diameter portion and large in the curved portion, as shown in Fig. 3. ,
If we look at it as a set of two sheets rotated by 45 degrees and stacked on top of each other, the fourth
As shown in the figure, the average length in the radial direction of the back of the core is uniform at any point on the circumference, so the cross-sectional area of the magnetic path for the circumferential magnetic flux at the back of the core is uniform, and the stator core has a circular outer diameter. It is possible to provide the same performance.

In this case, the area of the strip-shaped thin steel plate material required for each core plate having the same performance as the circular stator core outer diameter is 0.
854D2 (°, °C08222,5°-0,854)
Therefore, the amount of material used is reduced by 1 compared to a circular stator core.
It can be reduced by 4.6%.

Further, by doing as described above, the average cross-sectional area of the magnetic path is made uniform at any position on the circumference, so generation of axial voltage can be prevented. Furthermore, the rigidity against in-plane deformation of the back of the core increases,
It also has the effect of reducing electromagnetic vibration and electromagnetic noise. In addition, as shown in Fig. 5, the protruding core plate serves as a ventilation fin, and there is a ventilation gap M equal to the thickness of the core plate between the core plates KK.
This increases the cooling area and improves the cooling effect of the core.

In addition, in the above embodiment, the corner shape is a curve such that the average length in the radial direction of the back of the core of a set of core plates (8) rotated by 45 degrees and stacked one on top of the other is a part of any point on the circumference. However,
It may have a straight, chamfered shape as shown in FIG. 8, or it may have a circular arc shape with an appropriate curvature R as shown in FIG. 9, and substantially the same effect as the above embodiment can be achieved.

In this case, the corner of the iron core plate (8) in FIG.
The notch may be cut at a straight line P outside a tangent passing through a point N on the diagonal of the arc drawn by the radius OF shown in the figure. or,
The corner of the iron core plate (8) in FIG. 9 may be cut out at a convex arc Q that is outside the arc BHNF. Therefore, the notch at the corner is larger than the diameter of the circle passing through the intersection point P' of the corners shown in Fig. 4, which is formed between the core plates (8) stacked in a staggered manner. It is sufficient if the notch is formed by a straight line or a convex curve passing through the point of the large diameter.

When cutting out the corners of the above-mentioned iron core plate, on the diagonal line of the square shown in FIG.
If the core plate is cut out with a straight line or curve that passes through points in the range of %, the core plates can be assembled with a 45° offset
@, The average outer diameter force at each part of the circumference of a combination of two iron core plates that can be effectively used;, Since it is about ±5% of the iron core plates in Figure 3 combined as in Figure 4, it is practically It becomes acceptable.

As shown in Figure 8, with a core plate whose corners have been cut out in a straight line, when removing the core plate from a band-shaped plate, it is only necessary to cut the entire core plate with a shearing machine, eliminating the need for extra extraction tools or presses. Equipment becomes easier. The angle of shift of the iron core plate is not limited to 45°, and angles other than multiples of 90° can be applied. For example, an angle that is an odd multiple of 45° may be applied.

As described above, according to the present invention, the shape of the core plate is made such that a part of the core material, which was conventionally used as punching waste, can be utilized, so that the cross-sectional area of the magnetic path at the back of the core is substantially reduced. VC will be expanded.

Therefore, if it is applied to a machine with the same output as before,
The core plate size can be made smaller than that of a circular core plate,
The amount of iron core material used can be reduced.

[Brief explanation of drawings]

Fig. 1 is a 7J< section front view of the stator core of a conventional rotating electric machine, Fig. 2 is a cut-out view of a conventional iron core plate, and Figs. In the figures, Fig. 3 is a front view showing the shape of the core plate, Fig. 4 is a cross-sectional front view of the stator core, Fig. 6 is a cross-sectional view taken along the ■-IV line, and Figs. 7 is a perspective view of the stator core, and FIGS. 8 and 9 are plan views of core plates of other embodiments. The lake is the core plate, and (9) is the stator core. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Makoto Kuzuno - Figure 1 Figure 2 Figure 3 Figure 4

Claims (3)

[Claims] (1) In a stator core for a rotating electric machine, which is made up of square core plates that are stacked in the axial direction by sequentially shifting them by a predetermined angle in the circumferential direction, each corner of the core plate is cut out. Fixing of a rotating electric machine characterized by having a notch formed by a straight line or a curved line passing through a point whose diameter is larger than the diameter of a circle passing through the intersection of each side formed between the iron core plates stacked in a staggered manner. Child iron heart. (2) A stator core for a rotating electric machine according to claim 1, wherein the shift angle of the core plate is 45°. (3) Claim 1 or 2, characterized in that the notch in the core plate is formed by an arc with one radius.
A stator core for a rotating electrical machine as described in .