JPH051965Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an armature for a rotating electric machine that can increase the amount of effective magnetic flux.

(Prior Art) In order to effectively utilize the magnetic flux of a field, there is an armature for a rotating electric machine in which a yoke plate is stacked on a laminated core. FIGS. 13 to 16 show examples of such conventional armatures of rotating electric machines. In FIGS. 13 to 16, reference numeral 2 indicates a laminated core, and this laminated core 2
is formed by stacking a plurality of core materials. Yoke plates 1, 1 are superimposed on both upper and lower end surfaces of this laminated core 2. A shaft 4 is press-fitted through the centers of the laminated core 2 and yoke plates 1, 1. The yoke plates 1, 1 have a plurality of ribs 1 formed in the radial direction centering on the shaft 4.
b, and a salient pole 1a formed by extending the tip of each rib 1b in a direction parallel to the axis 4. The ribs 1b of each yoke plate 1, 1 overlap the ribs of the laminated core 2, and the outer peripheral surface of the salient pole 1a of the yoke plates 1, 1 is on the same plane as the outer peripheral surface of the salient pole portion of the laminated core 2. A coil 3 is wound around the ribs of the overlapping yoke plates 1, 1 and the laminated core 2.

(Problem to be solved by the invention) According to the above conventional example, the salient poles of the yoke plate can collect more magnetic flux than the saturation amount at the ribs of the yoke plate, but the cross-sectional area of the ribs of the yoke plate is Due to processing and winding space constraints, it is not possible to increase the number sufficiently. Therefore, the magnetic flux of the field collected by the yoke plate cannot flow sufficiently to the core, and if the cross-sectional area of the ribs of the yoke plate is increased, the magnetic flux increases, but the length per turn of the winding is becomes longer,
The winding space becomes smaller and the characteristics do not improve.

In view of such prior art, the present invention has been developed by increasing only the cross-sectional area of the ribs of the yoke plate without increasing the cross-sectional area of the entire rib portion, which is the combination of the ribs of the yoke plate and the ribs of the laminated core. It is an object of the present invention to provide an armature for a rotating electrical machine that has a structure that can increase the amount of effective magnetic flux and improve characteristics.

(Means for Solving Problems) The present invention provides an armature for a rotating electric machine equipped with a yoke plate having salient poles, in which each rib of the yoke plate is expanded in the circumferential direction to a width greater than the winding width of the coil. It is characterized in that the cross-sectional area of the rib is expanded, and both edges of the rib in the circumferential direction are bent to form a predetermined winding width of the coil.

(Function) The magnetic flux of the field collected by the salient poles of the yoke plate flows to the ribs of the yoke plate. Since the salient poles extend in the axial direction, they can collect a large amount of magnetic flux. The ribs on the yoke have a width that is larger than the winding width of the coil, and both edges in the circumferential direction are bent to obtain the prescribed winding width of the coil, so the ribs on the yoke have a cross-sectional area for the prescribed winding width. becomes larger, the magnetic flux collected by the salient poles becomes easier to flow to the ribs, and the amount of effective magnetic flux increases.

(Embodiment) FIGS. 1 to 3 show an embodiment of an armature of a rotating electric machine according to the present invention. 1 to 3, reference numeral 12 denotes a laminated core, and this laminated core 1
2 is formed by stacking a plurality of core materials. This laminated core 12 has a plurality of ribs formed in the radial direction, and a salient pole portion in which the tip of each rib expands in the circumferential direction. Yoke plates 11, 11 are provided on both upper and lower end surfaces of the laminated core 12.
are closely overlapped. A shaft 1 passes through the center of these laminated cores 12 and yoke plates 11, 11.
4 is press-fitted and fixed. The yoke plates 11, 11 have a plurality of ribs 11b formed in the radial direction around the shaft 14, and a protrusion formed by extending the tip of each rib 11b in a direction parallel to the shaft 14. and a pole 11a. Yoke plate 1
The ribs 11b of 1 and 11 overlap the ribs of the laminated core 12, and the outer circumferential surfaces of the salient poles 11a of the yoke plates 11 and 11 are on the same plane as the outer circumferential surfaces of the salient pole portions of the laminated core 12.

Each of the above-mentioned yoke plates 11, 11 has its respective rib 11
Rib 11b is widened in the circumferential direction to be wider than the winding width of the coil to increase the cross-sectional area.Finally, both edges of the rib 11b in the circumferential direction are bent to obtain a predetermined winding width of the coil. They are formed to have the same width. In the above embodiment, each rib 1 of the yoke plate 11
Both side edges in the circumferential direction of 1b are bent in a direction to wrap around the ribs of the laminated core 12. Such bending of the yoke plate 11 may be performed before the armature is assembled, or may be performed during the assembly process. The outer peripheral surface of the salient pole portion of the laminated core 12 and the outer peripheral surface of the salient pole 11a of the yoke plates 11, 11 face the field 16 with a predetermined gap therebetween.

Since the salient pole portions of each core material constituting the laminated core 12 are only widened in the circumferential direction but not in the axial direction, they cannot collect enough magnetic flux, and the magnetic flux flowing through the ribs is also small. . On the other hand, since the salient pole 11a of the yoke plate 11 is widened in the axial direction, the magnetic flux can be sufficiently collected, and the salient pole 11a
Much of the magnetic flux collected in 1a can flow to rib 11b. According to the above embodiment, the rib portion 1 consists of the rib of the laminated core 12 and the rib 11b of the yoke plate 11.
Although the width of 5 itself is formed to the predetermined winding width of the coil and its overall cross-sectional area has not increased, the cross-sectional area of the ribs of the laminated core 12, which cannot flow sufficient magnetic flux, has decreased. On the other hand, the cross-sectional area of the rib 11b of the yoke plate 11, which allows more magnetic flux to flow, is increased. Therefore, the effective magnetic flux flowing through the rib portion 15 can be increased without limiting the winding space, and the characteristics of the rotating electric machine can be improved.

The direction in which both circumferential edges of each rib of the yoke are bent may be outward with respect to the laminated core. Figures 4-6 illustrate such an embodiment. 4 to 6, the laminated core 22 is made of two core materials, and the width of the rib portion in the circumferential direction is equal to the predetermined winding width of the coil. On both end surfaces of the laminated core 22, there are yoke plates 21, 21 each having a plurality of radial ribs 21b and a salient pole 21a formed by extending the tip of the rib 21b in the direction of the axis 24. They are stacked closely together. The yoke plates 21, 21 have their respective ribs 2
1b is expanded in the circumferential direction to a width greater than the winding width of the coil to increase the cross-sectional area, and the rib 21b is
Both edges in the circumferential direction of the coil are folded back outward to form a width equal to a predetermined winding width of the coil.

In this embodiment, although the number of core materials of the laminated core 22 is small, the ribs 21b of each yoke plate 21 that easily collect magnetic flux are folded to overlap each other, so that the laminated core 22
Even if the cross-sectional area of the entire rib portion 25 consisting of the rib 21b and the rib 21b of the yoke plate 21 is made the same as the conventional one, the amount of magnetic flux flowing through the entire rib portion 25 can be increased.

The present invention does not necessarily require the use of a core.
FIGS. 7 to 9 illustrate such an embodiment. In this embodiment, the laminated core 22 is removed from the embodiment shown in FIGS. 4 to 6, and the yoke plates 31 and 31 are directly stacked back to back. code 31
a is a salient pole of the yoke plate 31, 31b is a salient pole of the yoke plate 31
34 is a shaft, and 36 is a field.

According to this embodiment, the laminated core is formed by folding back the circumferential side edges of the ribs 31b of each yoke plate 31, 31, which facilitate the flow of magnetic flux, so that four ribs are substantially overlapped. Even without the rib portion, sufficient magnetic flux can flow even though the cross-sectional area of the entire rib portion becomes small.

Now, let's consider the basic characteristics of the motor. The basic characteristics of a motor are the back electromotive force constant Ke and the torque constant.
Determined by Kt and internal resistance R. When the basic structure is determined, Ke and Kt are determined by the number of turns of the coil and the effective magnetic flux φ, and R is determined by the number of turns, the wire diameter of the coil, and the outer circumference length of the rib. That is, the characteristics of the motor are proportional to (φ ² ×winding space)/rib outer circumference length. Therefore, in order to improve the characteristics, the magnetic flux φ
It is necessary to increase the winding space, increase the winding space, and shorten the outer circumference of the rib. In small motors with small diameters, in order to collect enough magnetic flux φ, the laminated thickness of the core is generally increased, but this increases the outer circumference of the ribs and increases the internal resistance R of the coil, which affects the characteristics. This is a factor that reduces the However, by using a yoke plate to increase the area of the surface facing the field, it is possible to collect a large amount of magnetic flux without increasing the thickness of the laminated layers of the core. The outer circumference length can be shortened.

However, simply adding a yoke plate to a laminated core as in the past does not allow the magnetic flux collected by the yoke plate to flow sufficiently toward the core, because in the conventional armature structure using a yoke plate, the cross-sectional area of the yoke plate ribs is limited, and the magnetic flux collected by the salient poles of the yoke plate cannot flow effectively toward the ribs.

On the other hand, according to each of the embodiments of the present invention described above, the yoke plate has a cross-sectional area expanded by widening each rib in the circumferential direction to a width greater than the winding width of the coil. By bending the edges on both sides in the direction to obtain the prescribed winding width of the coil, even if a laminated core is used, the ratio of the cross-sectional area of the rib of the yoke plate, which facilitates the flow of magnetic flux, to the cross-sectional area of the entire rib portion can be reduced. This can increase the effective magnetic flux. Furthermore, once the required characteristics of the rotating electric machine are determined, the required winding width of the rib portion is determined from the relationship between the winding space and the outer circumferential length of the rib portion using the above equation. In FIG. 10, W indicates the winding width of the coil at the rib portion, and this winding width W
The cross-sectional area of the rib portion is determined by the thickness D of the rib portion in the width direction. In the present invention, once the winding width W is determined, the rib portion of the yoke plate is expanded to be larger than the winding width, and then the rib portion of the yoke plate is formed as shown in FIG. Both edges in the circumferential direction are bent to obtain the predetermined winding width W. Therefore, since the cross-sectional area of the entire rib portion does not increase, the winding space is not restricted and the outer circumference of the rib portion does not become long, improving the characteristics of the rotating electric machine. I can do it.

FIG. 12 shows a rib 1 of a predetermined cross-sectional area of the yoke plate.
When the amount of saturation magnetic flux that can flow through each core material is 10, the amount of magnetic flux between the conventional example and the embodiment of the present invention is compared assuming that 7 magnetic fluxes flow through one core material of the laminated core. , a shows the conventional example, b shows the embodiment shown in FIGS. 1 to 3, and c shows the embodiment shown in FIGS. 4 to 6. As is clear from FIG. 12, according to the present invention, the ratio of the cross-sectional area of the rib of the yoke plate, which can increase the amount of magnetic flux per unit area, to the cross-sectional area of the entire rib portion increases. In each of the examples, the magnetic flux φ is increased compared to the conventional example, and the characteristics are improved in proportion to the square of the magnetic flux φ.

(Effect of the invention) According to the invention, each rib of the yoke plate is expanded in the circumferential direction to a width greater than the winding width of the coil to increase the cross-sectional area, and both edges of the rib in the circumferential direction are was bent to make the prescribed winding width of the coil.
Even if a laminated core is used, the ratio of the cross-sectional area of the rib of the yoke plate, which facilitates the flow of magnetic flux, to the cross-sectional area of the entire rib portion can be increased.
Effective magnetic flux can be increased. In addition, since the cross-sectional area of the entire rib portion does not expand, the winding space is not restricted, the outer circumference of the rib portion does not increase, and the effective magnetic flux increases. It is possible to improve the characteristics.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the armature of a rotating electric machine according to the present invention, and FIG. 2 is a line shown in FIG.
3 is a sectional view taken along the line - in FIG. 1, FIG. 4 is a plan view showing another embodiment of the armature of a rotating electric machine according to the present invention, and FIG. 6 is a sectional view taken along line - in FIG. 4, FIG. 7 is a plan view showing still another embodiment of the armature of a rotating electric machine according to the present invention,
Figure 8 is a sectional view taken along the line - in Figure 7;
10 is a perspective view generally showing the dimensional relationship of the rib portions; FIG. 11 is a perspective view showing the dimensional relationship of the rib portions in the present invention; The figure is a comparative diagram showing the amount of magnetic flux in the rib portion between a conventional example and an embodiment of the present invention, Fig. 13 is a front view showing a conventional example of an armature of a rotating electrical machine, and Fig. 14 is a plan view of the same. Figure 15 is the first
A cross-sectional view taken along the line - in Figure 4, Figure 16 is the 1st
4 is a sectional view taken along line YY in FIG. 4. FIG. 11, 21, 31...Yoke plate, 11a, 21
a, 31a... salient pole, 11b, 21b, 31b...
...Rib, 14, 24, 34...shaft.

Claims (1)

[Scope of utility model registration request] It has a plurality of ribs formed in the radial direction around the axis and around which the coil is wound, and a salient pole formed by extending the tip of each rib in the axial direction. In the armature of a rotating electric machine equipped with a yoke plate, the yoke plate has each rib expanded in the circumferential direction to a width greater than the winding width of the coil to increase the cross-sectional area, and both sides of the rib in the circumferential direction are used. An armature for a rotating electric machine characterized by having an edge bent to form a predetermined coil winding width.