JPS5812547A - Stator core for rotary electric machine - Google Patents

Abstract

PURPOSE:To increase the output capacity of a rotary electric machine with a stator frame of the same outer size by rotatably displacing iron plates punched in a shape cut at four corners of a square alternately at 45 deg. and laminating the plates to form a stator core. CONSTITUTION:When core plates 15 punched substantially in square shape are rotatably displaced at 45 deg. from each other and are thus laminated to form a stator core 14, the shape of the plates 15 is cut at four corners of a square, and is formed in the shape that the average outer diameter of both core plates thus displaced and laminated is substantially equal over the entire periphery and to the outer diameter at the positions of the crossing points of each both sides. In this manner, since larger stator core 14 can be contained in the stator frame 11 of the same outer diameter size, the output capacity can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION In the present invention, iron core plates punched into square shapes are alternately rotated by 45° in the circumferential direction and stacked.

Regarding the stator core of rotating electrical machines.

Conventionally, this type of stator core has a front cross section WJ shown in Figure 1.
l! i! ! There was one marked with l. Reference numeral 11 denotes a stator frame, on which a plurality of support arms (2) are arranged in the axial direction, and are fixed to both end plates of the stator frame (314 → 1 to 1).

(4) is a stator core that is fitted and supported by each support arm (2) of the stator arm. Square core plates (&) punched from an electrical steel plate are alternately stacked one or more times. to 45
It is constructed by rotating and shifting the layers. (5a) is a sqt punched out from the iron core plate (5).

In the above-mentioned conventional stator core (4), by making the outer shape of the core plate <61 square, the core material plate is used more effectively and the yield is improved compared to a stator core with a general circular core plate. There is. In addition, in order to reduce the change in the cross-sectional area of the magnetic path at the back of the core at each position in the circumferential direction, the core plates (5) are laminated by rotating one or more core plates alternately by 45 degrees. ing.

In the conventional stator core (4), the cross-sectional area of the magnetic path at the back of the core differs depending on each position in the circumferential direction, and each side of both square core plates (5) are shifted at an angle of 45 degrees from each other. It is minimum at the intersection of . Due to the magnetic saturation characteristics of the core material, the maximum value of the magnetic flux density of the magnetic path is limited, so the effective core outer diameter is determined by the part at the back of the core where the cross-sectional area of the magnetic path is minimum.
Iron core plate (5) width (length of one side of square) approximately 1.082
times (1,.l/(40822.5°-1.082).

On the other hand, the maximum outer diameter of the stator core (4) is the length of the diagonal line of the core plate (5), which is approximately 1.414 times the width of the core plate (5). Therefore, the ratio of the core effective outer diameter to the maximum outer diameter is 0.765 ('',' l.082/l −4
14-0・)65). The size of the stator core (4) that can be accommodated in stator w This decreases to 0.765 times that of a plate.

Generally, the capacity of a rotating electric machine is proportional to the second to third power of the effective outer diameter of its core, so when housed in a stator frame with the same external dimensions, the output capacity of the conventional stator core (4) is equal to that of a circular core. There was a drawback that it was about 1/2 compared to the previous model. In addition, in the conventional stator core (4), the difference between the minimum and maximum magnetic path cross-sectional area is large and uneven at each position in the circumferential direction, and there is a risk of generating a large axial voltage, which may damage the bearing. I had something to do.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and the average outer diameter value of the two iron core plates is
Almost equal at any point number in the circumferential direction, and
Each corner of the square iron core plate is cut out so that the diameter is approximately equal to the diameter of the circle passing through the intersection of both sides. The stator frame can accommodate a core with a larger effective outer diameter,
The output capacity is increased, and with the same output capacity, the external dimensions of the stator frame can be reduced, and the magnetic path cross-sectional area is made almost uniform at each position in the circumferential direction, and the generation of axial voltage is prevented. The aim is to provide stator cores for

FIG. 2 is a front sectional view showing a stator core according to an embodiment of the present invention. (11) is a stator frame in which a plurality of support arms Oz are arranged in the axial direction, and both end plates u3 of the stator frame
− is fixed to. 0 is a stator core that is fitted and supported by each support arm O2 of the stator frame circle,
It is constructed by stacking iron core plates, which are punched out from electrical iron plates and each corner of a square shape is cut out, by rotating and shifting one or more plates alternately by 45 degrees. The iron core plate 0 clause is the diameter of a circle whose average outer diameter is the same at any point in the circumferential direction, and which passes through the intersection of each side of the two sheets stacked on top of each other with a rotational shift of 45 degrees. Each corner is notched in a curved manner so that the value is approximately equal to the value. (15a) is a slot punched in the iron core plate (l).

In the stator core 0 in the above embodiment, the ratio of the effective outer diameter of the core to the core plate 061@ is 1.082, which is the same as the conventional one, so the core required to obtain the same effective outer diameter of the core is 1.082. The amount of raw material used is the same as the conventional one.

On the other hand, the maximum outer diameter of the core is as follows. Of the two iron core plates (+5) stacked with a 450 degree offset from each other, the cutout of the other plate relative to the side of one plate is located at the effective outside of the core i.
In order to make it equivalent to 1.082, there will be two sheets, one for itself and one for the shortfall on the side of one board, and 1.082 + (
1.0824) - 1.164 In other words, the maximum outer diameter of the core is 1.164 times the width of the core plate (1 x 1), and the ratio of the effective outer diameter of the core to the maximum outer diameter is 0.93. This makes it significantly larger than the O.765. Therefore, the effective outer diameter of the stator core that can be accommodated in a stator frame with the same external dimensions can be increased, increasing the output capacity. Since the cross-sectional area of the magnetic path at the back of the child core (14J) is uniform at each position in the circumferential direction, the generation of axial voltage is reduced.

In the above embodiment, the core plate 115) has curved corners and notches so that the average outer diameter of the two plates, which are shifted by 45 degrees, is the same at any position in the circumferential direction. However, it is also possible to do as shown in FIGS. 3 and 4.

FIG. 3 is a front view of a core plate showing another embodiment of the present invention. Each corner of the iron core plate has an appropriate radius r.
It is cut out by an arc of . In this way, the average outer diameter of the two sheets overlapped with a 45° shift is made to be approximately the same at any position in the circumferential direction. (16a) is a slot.

FIG. 4 is a front view of a core plate showing another embodiment of the present invention. Each corner of the iron core plate 0η is cut out with a 45° straight line. In this way, the average outer diameter of the two sheets overlapped with a 45° shift is made to be approximately the same at any position in the circumferential direction. (17a) is a slot.

As described above, according to the present invention, iron core plates having a shape in which each corner of a square is notched are alternately rotated by 45 degrees and stacked, and the notches of the corners are stacked while being shifted. Formed so that the average outer diameter of both iron core plates is approximately equal at any position in the circumferential direction, and approximately equal to the diameter of a circle passing through the intersection of each side of both. Therefore, a stator frame with the same external dimensions can have a larger output capacity.
The outer dimensions of the stator frame can be made smaller with the same output capacity, and the cross-sectional area of the magnetic path becomes almost uniform in the circumferential direction, which prevents the generation of axial voltage due to unevenness. There is.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of a stator frame showing a conventional stator core, FIG. 2 is a front sectional view of a stator frame showing a stator core according to an embodiment of the present invention, FIGS. FIG. 4 is a front view of a stator core plate showing other different embodiments of the present invention. 11... Stator (, 14... Stator core, 15...
... Iron core plate, 16.17... Iron core plate. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Nobu 4no - (1 other person) Figure 1 Figure 3 Figure 21"2'! Figure 4

Claims (1)

[Scope of Claims] (11) A stator core constructed by stacking core plates punched into square shapes alternately rotated by 45 degrees and stacked, each corner of the core plate having a notch, This notch is formed so that the average outer diameter of both core plates stacked in a staggered manner is approximately equal at any position in the circumferential direction, and the diameter of a circle that passes through the intersection of each side of both core plates. A stator core for a rotating electric machine, characterized in that the stator core is formed so that tr is equal to tr.(2) A patent claim characterized in that the notches at the corners of the core plate are curved notches. A stator core of a rotating electric machine according to claim 1. (3) A stator core of a rotating electric machine according to claim 1. (3) The notch at the corner of the core plate is a notch in a circular arc with one radius. A stator core for a rotating electrical machine according to claim 1, wherein the notch at the corner of the 41 core plate is a linear notch at an angle of 45°. .