JPS5918935B2 - Stator core of rotating electric machine - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention provides a stator for a rotating electrical machine that makes it possible to form a cylindrical shape by stacking multiple layers of one type of segment iron plate even if the number of coil slots provided in the segment iron plate is odd. Regarding the iron core.

Technical background of the invention and its problems As shown in Figure 1, the stator core of a rotating electric machine such as an induction motor or a synchronous machine generally has the following characteristics: the characteristics of the iron plate, the averaging of the magnetic path resistance at the joints, and the axial current. In order to prevent this and to simplify assembly, a plurality of segmented iron plates 1 are stacked with each layer alternately shifted to form a cylindrical shape.

In this case, two support grooves into which keys or clamps can be inserted are provided on the outer circumferential side of the segment iron plate 1, and a plurality of coil slots are provided on the inner circumferential side.

For example, Figures 10 and 11 are plan views of a laminated core with a total number of coil slots of 24, and the entire circumference is divided into 4 segments. Therefore, the number of coil slots in one segment iron plate 1 is 6, which is an even number. It is.

In this case, a cylindrical laminated iron core is formed by stacking a plurality of four circular segment iron plates 1 with the position of the seam 10 alternately shifted for each layer, but only one type of segment iron plate 1 is required.

However, the number of coil slots in one segment iron plate 1 is not necessarily an even number.

For example, if the number of coil slots in the iron core is 20 and the segment iron plate 1 is divided into four, the number of coil slots in one segment iron plate will be five, which is an odd number.

Therefore, as shown in FIGS. 2 and 3, the segment iron plate 1
And 2 must be divided into two types, one divided at the center of the coil slot 3 and one divided at the center of the tooth 4, or else the layers cannot be stacked by rubbing alternately ζ as shown in FIG. 4.

Therefore, when the number of coil slots in the segment iron plate 1 is an odd number, two types of cutting dies are required, and since the coils are stacked alternately, man-hours are required and manufacturing costs are increased.

OBJECT OF THE INVENTION The object of the present invention was made in view of the above-mentioned circumstances, and the purpose of the present invention is to produce a large number of segment iron plates of one type using only one cutting die even when the number of coil slots in the segment iron plate is odd, and to shift the segments into alternating layers. An object of the present invention is to provide a stator core for a rotating electric machine by stacking the same materials to form a predetermined cylindrical core.

Embodiment of the Invention The present invention will be described below with reference to FIGS. 5 to 7 of one embodiment.

Figure 5 shows that the segment iron plate 1 has five coil slots 3 (
(odd number).

The opening angle of this segment iron plate 1 is 4φ, and support grooves 5 with a pitch of 2φ below the angle are provided on the outer circumferential side.

A key 6 or clamp (not shown) that fits into this support groove 5
The positions of the center lines 7 and 8 do not necessarily have to be at equal intervals of the angle φ from both ends of the segment iron plate 1, but it is easier to work if they are at equal intervals in manufacturing. I made it.

The width of the support groove 5 is a length a that is half the key width on the right side of the center lines 7 and 8, and b on the left side (where b21Rθ0a, R is the outer diameter of the segment iron plate, and θ is the coil width. The length shall be the pitch of the slot).

The segment iron plates 1 are stacked one on top of the other with all of them facing the same direction and shifted alternately, and as shown in FIGS. If the coil slots 3 are arranged so as to be in contact with each other, there will be no displacement of the coil slots 3, and a desired stator core can be obtained.

Reference numeral 9 denotes a core holder, and the key 6 is welded to this and fitted into a frame (not shown) to constitute a rotating electric machine.

Fig. 12 shows another embodiment, which is a plan view of an odd laminated iron core in which the total number of coil slots is 36 and the circumference is divided into four parts, and the number of coil slots in one segment iron plate 1 is 9 (odd number). , FIG. 13 is a side view of FIG. 12 showing the joint 10 of the alternately laminated segment iron plates and the state of contact between the key 6 and the support groove 5.

In this way, even if the number of coil slots in the segment iron plate 1 is an odd number, by making a large number of one type of segment iron plate 1, a laminated iron core can be easily obtained, and the key 6
Since the end faces of the support grooves 5 of the segment iron plate 1 are in contact with both sides of the segment iron plate 1, it is possible to support rotational force from either the left or right side.
There is nothing inferior to conventional iron cores.

Next, in the modification shown in FIGS. 8 and 9, the segment iron plate 1 shown in FIG. The end faces of the two will come into contact with each other.

Therefore, since only one side of the key 6 supports the rotational force, the key 6 cannot be used for both rotations, but it has the effect of making assembly work extremely easy.

Effects of the Invention As described above, according to the present invention, even if the number of coil slots provided in the segment iron plates is odd, one type of segment iron plate is stacked with staggered seams to provide a stator for a rotating electrical machine with excellent characteristics. Since the iron core can be provided, productivity can be improved and manufacturing costs can be reduced.

In addition, in the above embodiment, the support groove is provided on the segment iron plate side, but the present invention provides a support groove on the frame side that fits into the iron core,
The segment iron plate side may be provided with a key-shaped protrusion, etc., and is not limited to the embodiments described above and shown in the drawings, and it goes without saying that various modifications can be made without changing the gist of the invention. .

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the concept of the stator core of a rotating electrical machine, Figs. 2 and 3 are plan views of segment iron plates in odd slots of the stator core of a conventional rotating electrical machine, and Fig. 4 shows it. FIG. 5 is a plan view of a segment iron plate of an embodiment of the stator core of a rotating electric machine of the present invention, FIG. 6 is a plan view of the main part of the stacked parts, and FIG. 7 is a plan view of the main parts laminated together. Fig. 8 is a plan view of the main part of laminated segment iron plates of different embodiments, Fig. 9 is a side view of the main part as seen from the direction of the key, and Fig. 10 is a side view of the main part as seen from the direction of the key. A plan view of a laminated core made of segment iron plates with even number of slots, FIG. 11 is a side view of FIG. 10, FIG. 12 is a plan view of a laminated core of another embodiment of the present invention, and FIG. 13 is a side view of FIG. 12. It is a diagram. 1... Segment iron plate, 3... Coil slot, 4... Teeth, 5... Support groove,
6...key, 7,8...key center line, 10...seam.

Claims (1)

[Claims] 1 A plurality of fan-shaped segmented iron plates of one type having a support groove and a key engagement part on the outer circumference side and a coil slot on the inner circumference side are arranged in a circular manner, and the joints of these are arranged in multiple layers as appropriate. In a laminated core formed into a cylindrical shape by alternately stacking each segment, the number of coil slots provided in the segment iron plates is an odd number, and the pitch of the support grooves is set to - of the segment iron plates,
The width of the support groove is a + b (however, 2a is the width of the key that enters the support groove, b2TRθ0a, R is the radius of the outer periphery of the segment iron plate,
A stator core for a rotating electric machine, characterized in that θ is the pitch of the coil slot), and one end of the support groove is in contact with a key.