JP2000152528A - Multipolar core, inner armature using it and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate wire winding work, while improving space factor and the like for attainment high quality. SOLUTION: Prior to assembly, circumferential salient pole core portions 13 of split core pieces 10a are coupled together in series from starting edge to terminating edge, and the inner radius core portions 11 are split into split inner radius bases 11a. The split inner circumferential bases 11a are developed in non-circular shape, and a coil 15 is wound on rib-shaped core portions 12, extending from each of the split inner radius bases 11a. Thereafter, the circumferential salient pole core portions 13 formed at the ends of the rib-shaped core portions 12 are coupled together by connecting portions 14, so that wires are easily wound and moreover a sufficient space factor is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-pole core for winding a coil around a plurality of rib-shaped core portions radially extending from an inner peripheral core portion, an inner armature using the same, and an inner armature using the same. It relates to a manufacturing method.

[0002]

2. Description of the Related Art In general, in a multipolar core used for an inner armature or the like, as shown in FIG. The ribs 2 extend radially, a coil 3 is wound around each of the rib-shaped cores 2, and an outer peripheral salient pole core is formed on a radially outer end portion of each of the rib-shaped cores 2. 4 are provided. Each of the inner peripheral core portion 1, the rib-shaped core portion 2, and the outer peripheral salient pole core portion 4 is integrally formed, and when the coil 3 is wound, a space between the adjacent outer peripheral salient pole core portions 4 is formed. The winding process is performed through the narrow gap.

[0003]

However, in such a general multipole core, since the space between the outer peripheral salient pole cores 4 is narrow, the winding operation can be performed efficiently. In addition, it is difficult to increase the space factor of the coil 3. In order to perform the winding operation well, a wide slit width may be used, but this would increase the cogging torque.

Further, in the conventional multipole core, in addition to the above-mentioned problem of the winding process, it is difficult to enlarge the magnetically opposed surface in the axial direction, and it is difficult to obtain high characteristics. There is also a problem that material removal is generally not very good.

As a means for solving such a problem, there is a split core structure in which a core is divided for each pole and formed so as to be integrated after winding. This split core structure has the advantage that the winding is easy and the space factor can be greatly increased.On the other hand, since the core is divided for each pole, handling before assembly and assembly are difficult. There is a problem that workability is not good, and it is structurally difficult to enlarge the magnetic facing surface in the axial direction, and there is a limit on the space factor.

Accordingly, the present invention provides a multipolar core capable of obtaining a high characteristic by improving a space factor and the like while facilitating a winding operation, and an inner armature using the same.
It is another object of the present invention to provide a method for producing them.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, an annular inner core portion and a coil extending radially from the inner core portion are wound around the inner core portion. A plurality of rib-shaped core portions, a coil wound around each of the rib-shaped core portions, a plurality of outer peripheral salient pole core portions provided at the radially outer end portion of each of the rib-shaped core portions,
In the multipolar core having the inner peripheral core portion, the inner peripheral core portion is formed by annularly connecting a plurality of divided inner peripheral substrates separated corresponding to each of the plurality of rib-shaped core portions and the outer peripheral salient pole core portion. In addition, the outer circumferential salient pole core portions of the plurality of outer circumferential salient pole core portions that are circumferentially adjacent to each other are connected to each other by a connecting portion having a narrow cross-sectional shape to be integrated.

According to the second aspect of the present invention, each divided inner peripheral base of the inner peripheral core portion according to the first aspect is formed with a concave / convex fitting portion for connection. Each of the divided inner peripheral substrates and the outer peripheral salient pole core portions of the inner peripheral core portion is formed in a fitting shape to be positioned and arranged in a substantially circular shape.

Further, in the invention according to claim 3, the connecting portion according to claim 1 is formed so as to be integrally connected to the outer peripheral salient pole core portion except for one portion.
The one connecting portion is formed of a separate connecting member fitted to each of a pair of adjacent outer peripheral salient pole core portions.

Further, in the invention according to claim 4, the connecting portion according to claim 1 is formed so as to be integrally connected to the outer peripheral salient pole core portion except for one portion, and The connection portion is formed of a concave / convex fitting portion formed on the pair of outer peripheral salient pole cores so that the pair of adjacent outer peripheral salient pole cores is fitted and engaged with each other.

According to a fifth aspect of the present invention, the inner peripheral core, the rib-shaped core, and the outer peripheral salient pole core according to the first aspect are constituted by a laminated core body, and at least the outer peripheral salient pole core is formed. Are partially laminated so as to have a lamination thickness greater than that of the inner peripheral core portion.

In the invention according to claim 6, the laminated core body according to claim 1 is constituted by a laminated body of grain-oriented electrical steel sheets.

Further, according to a seventh aspect of the present invention, the multipolar core according to the first or second or third or fourth or fifth or sixth aspect is used, wherein the coil is wound around a rib-shaped core portion. , And the outer peripheral salient pole core portion is circumferentially opposed to the annular magnet.

Furthermore, in the invention according to claim 8, an inner peripheral core portion formed in an annular shape, a plurality of rib-shaped core portions extending radially from the inner peripheral core portion, and each of the rib-shaped core portions is provided. And a plurality of outer peripheral salient pole cores integrally formed at the radially outer end of the inner pole type electric machine, wherein the coil is wound by applying a winding process to the rib-shaped core portion of the multipolar core. In the method for manufacturing a child, the inner peripheral core portion,
A plurality of divided inner peripheral substrates are formed corresponding to each of the plurality of rib-shaped core portions and the outer peripheral salient pole core portions, and each corresponding one of the divided inner peripheral substrates, the rib-shaped core portion, and the outer peripheral protrusions A plurality of sets of split core pieces each including a pole core portion are formed, and the other outer salient pole cores except for a pair of adjacent outer salient pole core portions of the plurality of outer salient pole core portions are formed. The parts are connected to each other by a connecting part having a narrow cross-sectional shape, and the plurality of divided core pieces are connected in series through a peripheral salient core part connected by the connecting part, from a starting end to an end. And performing a winding step on the rib-shaped core portion in a state in which the plurality of divided core pieces are expanded and opened in a non-circular shape, and thereafter, the plurality of divided inner peripheral substrates are formed. The inner peripheral core is constructed by connecting and integrating And, then, it is to connect the outer peripheral salient pole core portion each other of split core pieces corresponding to the beginning and end so as to be integrated in a ring.

On the other hand, in the ninth aspect of the present invention, the connecting portion is formed with a plate-like material having a narrow width so as to increase the magnetic resistance of the connecting portion of the eighth aspect.

According to a tenth aspect of the present invention, the connecting portion is formed with a plate-like material having a narrow width so as to increase the magnetic resistance of the connecting portion according to the eighth aspect.

Further, according to the eleventh aspect of the present invention, the magnetic resistance of the connecting portion according to the eighth aspect is increased.
The connecting portion is formed by bending with a radius smaller than the circumferential arrangement radius of the outer peripheral salient pole core portion.

According to the first aspect of the present invention, in a state before the assembly, if one of the plurality of connecting portions connecting the outer peripheral salient pole cores is cut off, the outer peripheral salient pole is cut. In a state where the pole cores are connected in series from the start end to the end, the inner core is separated for each divided inner base, and the rib-shaped core extending from each of the divided inner bases is formed. The winding operation of the coil is performed easily and with a sufficient space factor. On the other hand, since the outer peripheral salient pole core portions provided at the ends of the rib-shaped core portions are connected to each other by the connecting portions, the entire core can be easily handled during each operation.

At this time, as in the second aspect of the present invention,
By providing a concave / convex fitting portion for connection / positioning in each divided inner peripheral base, the inner peripheral core portion can be easily and accurately assembled.

Further, if the connecting portion excluding one portion is formed integrally with the outer peripheral salient pole core portion as in the invention of the third or fourth aspect, the outer peripheral salient pole core portion which is continuous in series is provided. It is possible to easily mold the core material that has been used.

At this time, as in the invention described in claim 4,
If one connecting portion is an uneven fitting portion provided on the outer peripheral salient pole core itself, a separate connecting portion becomes unnecessary, and the number of components is reduced.

Further, when the laminated core body is used as the core material and the laminated thickness at a portion corresponding to the outer peripheral salient core portion is partially increased, the shaft can be formed as follows. It is possible to easily enlarge the magnetic facing surface in the direction.

If a grain-oriented electrical steel sheet is used as the laminated core body in this case, the magnetic properties can be improved.

Similar effects can be obtained also when the above-mentioned multipole core is used for an inner armature as in the invention according to claim 7.

In the invention according to the eighth aspect, in a state where the outer peripheral salient pole cores are connected in series from the starting end to the end, the inner peripheral core is separated for each divided inner peripheral base. The winding operation of the coil is performed on the rib-shaped core portion extending from each divided inner peripheral base so as to be easy and have a sufficient space factor. On the other hand, since the outer peripheral salient pole core portions provided at the ends of the rib-shaped core portions are connected to each other by the connecting portions, the entire core can be easily handled during each operation.

At this time, if the connecting portion is formed in a high magnetic resistance state as in the ninth, tenth or eleventh aspect of the present invention, the leakage magnetic flux from the connecting portion is reduced, so that high characteristics are maintained. Is done.

[0027]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, the embodiment shown in FIG. 1 shows a multi-pole core 10 of a 12-slot inner armature used for a brushless motor. In this figure, illustration of the coil and the fixing portion is omitted for convenience of explanation.

The multipolar core 10 according to the present embodiment has a hollow annular inner peripheral core portion 11 at the innermost peripheral portion, and twelve rib-like core portions 12 from the inner peripheral core portion 11.
Extend radially. A coil (not shown) is wound around each of the rib-shaped core portions 12.
An outer peripheral salient pole core portion 13 is integrally formed at a radially outer end portion of each of the rib-shaped core portions 12. The multipolar core 10 according to the present embodiment is formed of a laminated core body in which a plurality of thin-shaped grain-oriented electromagnetic steel sheets are laminated, and that point will be described later.

The inner peripheral core portion 11 is divided into twelve portions corresponding to the twelve rib-shaped core portions 12 and the outer peripheral salient pole core portions 13, respectively. Are connected in a ring shape. That is, one divided inner peripheral base 11a forms one set of divided core pieces 10a together with one rib-shaped core part 12 and one outer peripheral salient pole core part 13, and the twelve divided core pieces 10a are annular. To form a multipole core 10 as shown in FIG.

At this time, a convex fitting portion 11b and a concave fitting portion 11c for connection are respectively formed in a congruent triangular shape on both circumferential end surfaces of each of the divided inner peripheral bases 11a. The convex fitting portion 11b of the divided inner peripheral body 11a on one side of the pair of adjacent divided inner peripheral bodies 11a, 11a is
By engaging the inside of the concave fitting portion 11c of the other divided inner peripheral substrate 11a, each divided inner peripheral substrate 11a is fitted in a predetermined positioning state. By such a positioning function, the inner peripheral core portion 11 is arranged in a plane circular shape, and the above-mentioned twelve outer peripheral salient pole core portions 13 are also arranged in a plane circular shape.

At this time, the outer circumferential salient pole core portions 13 adjacent in the circumferential direction are connected to each other by a connecting portion 14 having a narrow cross-sectional shape and integrated. Connection part 1
4 are provided at 12 locations on the entire circumference, and the remaining 11 connection portions 14 except for one connection portion indicated by reference numeral 14a are integrally connected to the outer peripheral salient pole core portion 13. Is formed.

As shown in FIG. 2, a separate connecting member is used as the connecting portion 14a. The connecting portion 14a formed of the separate connecting member forms a one-to-one pair. The outer peripheral salient pole core portions 13 are connected to each other. That is, the twelve outer peripheral salient pole core portions 13
Are formed integrally with the outer peripheral salient pole core portions 13.
And one pair of outer peripheral salient pole cores 13, 13 connected integrally by a plurality of connecting portions 14 and connected by a connecting portion 14 a made of the above-mentioned separate connecting member.
Constitute the start and end of a series of integrated bodies.

More specifically, the laminated steel sheet constituting the multipolar core 10 in the present embodiment is formed by punching in the state shown in FIG. That is, in a state immediately after the punching, the above-described 12 divided core pieces 10a
Are connected in series via the outer peripheral salient pole cores 13 which are connected in series at the connection portions 14, and a total of twelve divided core pieces 10a form a series continuous body. The split core piece 10a corresponding to the start end of the series body of the twelve split core pieces 10a and the split core piece 10a corresponding to the end are formed into a ring shape by the connection portion 14a formed of the separate connection member described above. They are connected and integrated.

The multipolar core 10 according to the present embodiment is similar to that shown in FIG.
As shown in the figure, the connecting portion 14 formed integrally with the outer peripheral salient pole core portion 13 is constituted by a laminated core body in which a plurality of thin-shaped grain-oriented electrical steel sheets are laminated. The plate material corresponding to the portion 14 is formed into a narrow cross section by crushing it in a thin shape, and the magnetic resistance of each connection portion 14 is greatly increased by the narrow cross section.
As another means for increasing the magnetic resistance of the connection portion 14, a plate material of the connection portion 14 may be formed to have a narrow width,
Means of forming a curve with a radius smaller than the circumferential arrangement radius of the outer peripheral salient pole core portion 13 are also conceivable.

As shown in FIGS. 5 and 6, each rib-shaped core portion 12 of the multipolar core 10 has a coil 1
5 is wound to form an inner-type armature. At this time, the winding process of the coil 15 is performed in a state before assembling the multipole core 10 described above, that is, in the development shown in FIG. Done in state.

Also, as described above, the inner core 1
1. The rib-shaped core portion 12 and the outer peripheral salient pole core portion 13 are composed of a laminated core body, and as shown in FIGS. 5 and 6, a portion corresponding to the outer peripheral salient pole core portion 13 is provided. On the other hand, the partially laminated cores 13 a are further laminated so as to be further laminated, and have a lamination thickness larger than that of the inner peripheral core portion 11. As a result, the surface facing the drive magnet 16 when incorporated in the motor is increased.

In assembling and manufacturing an inner armature using the multipole core 10 according to the present embodiment, first,
As shown in FIG. 3 described above, a state in which twelve split core pieces 10a,... Are punched and formed into a series continuous body, that is, twelve split core pieces 10a,. In a state where the coil 1 is opened linearly and opened, as shown in FIGS.
5 winding process is performed. Therefore, when the winding step is performed, the split core piece 10a at the upper end position in the drawing corresponding to the start end of the series body and the split core piece 10a at the lower end position in the drawing corresponding to the end are separated on the opposite side. And the rib-shaped core portion 12 of each divided core piece 10a.
The gap between them has been greatly expanded. As a result, the winding operation of the coil 15 on each rib-shaped core portion 12 is executed so as to have an easy and sufficient space factor.

In this case, when the inner peripheral core portion 11 is expanded so as to be bent in a direction opposite to the original annular connection state, like the split core piece 10a in the upper portion of FIG.
Since the divided inner peripheral base 11a has a more open shape,
The above winding operation will be further facilitated.

On the other hand, since each of the divided core pieces 10a is continuously and integrally connected by the connecting portion 14 connecting the outer peripheral salient pole core portions 13, the entire core does not fall apart. Handling of the whole core inside is also performed easily and reliably.

Further, as in the present embodiment, the concave / convex fitting portions 11b, 1
1c, the work of fitting the divided inner peripheral bases 11a to each other is easily and accurately performed, and the multipolar core 10
Will be improved in assembly productivity.

In this embodiment, one connecting portion 1 is provided.
Since the other connecting portions 14 except 4a are formed integrally with the outer peripheral salient pole core portion 13, the entire core including the connecting portions 14 is efficiently manufactured at the time of punching and forming of the electromagnetic steel sheet. As shown in FIG. 7, for example, as shown in FIG. 7, a protruding portion of the other core material B is inserted into a gap portion of the one core material A at the time of punch forming of the electromagnetic steel sheet. If they are faced alternately, the electromagnetic steel sheet will be used almost without waste, and the material cost will be greatly reduced.

Further, in the present embodiment, the laminated core body of the grain-oriented electrical steel sheet is used for the multipolar core 10, and the laminated thickness of the portion corresponding to the outer peripheral salient pole core portion 13 is partially increased. Thus, the magnetically opposed surface in the axial direction with respect to the drive magnet 16 is easily enlarged, and good magnetic characteristics can be obtained. In the case of the conventional split core, it is difficult to provide and fix the partially laminated core 13a as in the present embodiment.

In this embodiment, each of the divided core pieces 10a, in particular, the outer peripheral salient pole core portion 13 is integrally formed integrally with the connecting portion 14, but as in the embodiment shown in FIG. It is also possible to adopt a configuration in which adjacent outer peripheral salient pole cores 23 are fitted and connected to the concave / convex fitting portions provided on the outer peripheral salient pole cores 23 themselves by 23a or 23b. This eliminates the need for a separate connection part, and reduces the number of components. In this case, unlike the above embodiment in which all the divided core pieces 10a,.
are separately punched and formed.

Reference numeral 24a in FIG. 8 indicates a connecting portion of another shape for connecting both ends of the divided core piece 10a.

On the other hand, the embodiment shown in FIG. 9 shows a multi-slot core of a three-slot inner armature used for a brushed motor. In this figure, the coil and the fixing portion are not shown for the sake of explanation.

The multipole core 30 according to the present embodiment has a hollow annular inner core 31 at the innermost periphery, and three rib-shaped cores 32 are radially formed from the inner core 31. Is extended. A coil (not shown) is wound around each of the rib-shaped core portions 32, and an outer peripheral salient pole core portion 33 is integrally formed at a radially outer end portion of each of the rib-shaped core portions 32. ing. The multipolar core 30 in the present embodiment is formed of a laminated core body in which a plurality of thin non-oriented electrical steel sheets are laminated.

The inner core 31 is composed of three divided inner bases 31a separated corresponding to the three rib-shaped cores 32 and the outer salient pole cores 33, respectively. The peripheral bases 31a are connected in a ring shape. That is, one divided inner peripheral base 31a forms one set of divided core pieces 30a together with one rib-shaped core part 32 and outer peripheral salient pole core part 33, and the three divided core pieces 30a are annularly formed. Collectively, they constitute a multipole core 30 as shown in FIG.

At this time, a convex fitting portion 31b and a concave fitting portion 31c for connection are formed in a triangular shape on both end surfaces in the circumferential direction of each of the divided inner circumferential bases 31a, and are adjacent to each other in the circumferential direction. By engaging the convex fitting portion 31b of the divided inner peripheral substrate 31a on one side of the pair of divided inner peripheral substrates 31a, 31a with the concave fitting portion 31c of the divided inner peripheral substrate 31a on the other side, Each divided inner peripheral base 31a is connected in a predetermined positioning state. As a result, the inner peripheral core portion 31 is formed in a plane circular shape, and the three outer peripheral salient pole core portions 33 described above are also arranged in a plane circular shape.

At this time, the adjacent outer peripheral salient pole core portions 33 are connected to each other by a connecting portion 34 having a narrow cross-sectional shape and integrated. The connection portions 34 are provided at three locations on the entire circumference. Each connection portion 34 is formed integrally with the outer peripheral salient pole core portion 33.

One of the three outer salient pole cores 33 is formed with a concave / convex fitting portion, and is connected to the connecting portion 34 with another adjacent outer salient pole core 33. The protruding engaging portion 34a is formed in a notch-shaped locking groove 3
4b. That is, the three divided core pieces 30a are formed from a continuous body in series via the outer peripheral salient pole core part 33 connected by the connection part 34, and both ends of the series body are fitted with the above-described uneven fitting. Joint 3
4a and 34b are connected annularly and integrated.

The multipolar core 30 according to such an embodiment
In this case, the same operation and effect as those of the above-described embodiment can be obtained.

The embodiments of the present invention made by the inventor have been specifically described above. However, the present invention is not limited to the above-described embodiments, and can be variously modified without departing from the gist thereof. Needless to say. For example, the present invention can be similarly applied to a multipole core having a number of slots other than the above-described embodiments.

[0053]

As described above, claim 1 or 8 or 1
According to the invention described in 2 above, in a state before assembly, the outer peripheral salient pole core portions of the divided core pieces are connected in series from the starting end to the end, and the inner peripheral core portion is separated for each divided inner peripheral base. Expanded into a circular shape, coil winding work is performed on the rib-shaped core portion extending from each divided inner peripheral base, and then the outer salient pole core portions provided at the ends of the rib-shaped core portions are joined together. Since they are connected by the connection portion, it is possible to easily perform the winding work so as to have a sufficient space factor, and to improve the space factor and the like to achieve high characteristics. At the same time, the whole core unit can be easily handled, and productivity such as assembly workability can be greatly improved as compared with the conventional split core.

According to the second aspect of the present invention, each divided inner peripheral base is provided with a concave / convex fitting portion for connection / positioning so that the inner peripheral core can be easily and accurately assembled. Therefore, the above-described effects can be further enhanced.

Further, according to the third aspect of the present invention, the connecting material except for one portion is formed integrally with the outer peripheral salient pole core portion, and a core material having the outer peripheral salient pole core portion which is continuous in series is easily formed. Therefore, the above-described effects can be further enhanced.

Further, according to the present invention, the connecting portion at one place is formed as a concave and convex fitting portion of the outer peripheral salient pole core portion, so that a separate connecting portion is not required and the number of parts can be reduced. With this configuration, productivity such as assembly workability can be further improved, and the above-described effects can be further enhanced.

According to a fifth aspect of the present invention, a laminated core body is used as a core material, and the laminated thickness of a portion corresponding to the outer peripheral salient pole core portion is partially increased, so that an axial magnetic opposition is achieved. Because the surface can be easily expanded,
In addition to the effects described above, the magnetic characteristics can be improved.

In the invention according to claim 6, the characteristics are improved by using a grain-oriented electrical steel sheet as the laminated core body, so that the above-mentioned effects can be further enhanced.

Further, in the invention according to claim 7, since the above-described multipole core and the method for manufacturing the same are used for an inner-type armature, the same effects as those described above can be obtained.

According to the ninth, tenth, or eleventh aspect of the present invention, the connection portion is set in a high magnetoresistance state to reduce magnetic flux leakage from the connection portion and maintain high characteristics. The effect obtained can be obtained reliably.

[0061]

[Brief description of the drawings]

FIG. 1 is an explanatory plan view of a multipole core according to an embodiment in which the present invention is applied to a 12-slot inner armature used for a brushless motor.

FIG. 2 is an enlarged plan view showing a part of the multipolar core shown in FIG. 1;

FIG. 3 is an explanatory plan view showing a developed state of the multipolar core shown in FIG. 1;

FIG. 4 is an enlarged side view showing a part of the multipolar core shown in FIG. 1;

FIG. 5 is a partially enlarged plan view illustrating a state in which a coil is wound around a rib-shaped core portion and a state in which a partially laminated core is laminated on an outer peripheral salient pole core portion; .

FIG. 6 is an explanatory side view of FIG. 5;

FIG. 7 is an explanatory plan view showing a state of material removal of a core material.

FIG. 8 is an explanatory plan view corresponding to FIG. 2 and showing a structure of a connection portion in another embodiment of the present invention.

FIG. 9 is an explanatory plan view of a multipole core according to an embodiment in which the present invention is applied to a three-slot inner armature used for a motor with a brush;

FIG. 10 is an explanatory perspective view showing the appearance of a general multipolar core.

[Explanation of symbols]

 10, 30 Multipolar core 10a, 20a, 30a Divided core piece 11, 21, 31 Inner core part 11a, 31a Divided inner base 11b, 11c, 31b, 31c Concave and convex fitting part 12, 32 Rib-shaped core part 13, 23, 33 Peripheral salient pole core part 13a Partially laminated core 14.34 Connection part 14a, 24a Connection part 23a, 23b, 34a, 34b Uneven part

Claims (11)

[Claims] An inner core formed in an annular shape, a plurality of rib cores extending radially from the inner core and wound with coils, and a radially outer end of each rib core And a plurality of outer salient pole cores provided on the respective portions, wherein the inner peripheral core is separated corresponding to each of the plurality of rib-shaped cores and the outer salient pole core. A plurality of divided inner peripheral bases are connected in a ring shape, and the outer peripheral salient pole cores adjacent in the circumferential direction among the plurality of outer peripheral salient pole cores have a narrow cross-sectional shape. A multipolar core, wherein the multipolar core is integrated by being connected to each other by a portion. 2. The divided inner peripheral base body of the inner peripheral core portion includes:
Concavo-convex fitting portions for connection are respectively formed, and the concavo-convex fitting portions are formed in a fitting shape for positioning and positioning the divided inner peripheral base and the outer peripheral salient pole core portion of the inner peripheral core portion in a substantially circular shape. 2. The method according to claim 1, wherein
Multipolar core as described. 3. The connecting portion is formed so as to be integrally connected to the outer peripheral salient pole core except for one portion, and the one connecting portion is formed of a pair of adjacent outer peripheral salient pole cores. 2. The multi-pole core according to claim 1, wherein the multi-pole core comprises a separate connecting member fitted to each of the portions. 4. The connecting portion is formed so as to be integrally connected to the outer peripheral salient pole core except for one portion, and the one connecting portion is formed of a pair of adjacent outer peripheral salient pole cores. 2. The multipolar core according to claim 1, wherein the pair of outer salient pole cores is formed by a concave and convex fitting portion formed on the pair of outer peripheral salient pole cores so that the portions are fitted and engaged with each other. 5. The inner peripheral core portion, the rib-shaped core portion and the outer peripheral salient pole core portion are formed of a laminated core body, and at least a portion corresponding to the outer peripheral salient pole core portion has a higher diameter than the inner peripheral core portion. 2. The multipolar core according to claim 1, wherein the partially laminated cores are stacked so as to have a large laminated thickness. 6. The multipolar core according to claim 1, wherein said laminated core body is formed of a laminated body of grain-oriented electrical steel sheets. 7. The multi-pole core according to claim 1, wherein the multi-pole core is provided with a coil wound around a rib-shaped core portion, and an outer peripheral salient pole is provided. An inner type armature, wherein a core portion is circumferentially opposed to an annular magnet. 8. An inner core formed in an annular shape, and a plurality of rib-shaped cores extending radially from the inner core.
A plurality of outer peripheral salient pole cores integrally formed at the radially outer end portions of the respective rib-shaped core portions; In the method for manufacturing an inner armature as described above, the inner peripheral core portion is formed from a plurality of divided inner peripheral substrates separated corresponding to each of the plurality of rib-shaped core portions and the outer peripheral salient pole core portions. A plurality of sets of divided core pieces each composed of a corresponding one of the divided inner peripheral bases, a rib-shaped core portion, and an outer salient pole core portion are formed in plural sets, and among the plurality of outer peripheral salient pole core portions, The other outer salient pole cores except for a pair of adjacent outer salient pole cores are connected to each other by a connecting portion having a narrow cross-sectional shape, and via the outer salient pole core connected by the connecting portion. From the starting end to the end In a state where the plurality of divided core pieces are expanded and opened in a non-circular shape, a winding process is performed on the rib-shaped core portion. An inner core portion is formed by linking and integrating the divided inner circumferential substrates into an annular shape, and then connecting the outer salient pole core portions of the split core pieces corresponding to the start end and the end to form an annular shape. A method for manufacturing an inner armature, wherein the method is integrated. 9. The method for manufacturing an inner armature according to claim 8, wherein the connecting portion is formed by crushing a plate-like material into a thin shape so as to increase the magnetic resistance of the connecting portion. 10. The method for manufacturing an inner armature according to claim 8, wherein the connection portion is formed with a plate-like material having a narrow width so as to increase the magnetic resistance of the connection portion. 11. The connecting portion is formed by bending the connecting portion with a radius smaller than the circumferential arrangement radius of the outer salient pole core portion so as to increase the magnetic resistance of the connecting portion.
A method for manufacturing the inner armature according to the above.