JP3156498B2 - Armature of commutator type rotating electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a commutator type rotating electric machine having a commutator. The armature of the commutator-type rotating electric machine according to the present invention can be applied to an automobile starter.

[0002]

2. Description of the Related Art A conventional commutator of a commutator-type rotating electric machine has a plurality of commutator pieces which are electrically insulated from a rotating shaft and arranged around a rotating shaft in a circumferential direction and an axial direction, respectively.
The upper conductor portion and the lower conductor portion coming out of the slot of the armature core are fixed to the commutator piece arranged at a small diameter position by a coil end portion which expands in an axial direction and curves in a circumferential direction and a radially inward direction. ing.

Japanese Patent Application Laid-Open No. 63-194541 discloses that a brush contact portion extending in the axial direction is partially buried in the surface of a molded resin cylinder (insulating material) fitted on a rotating shaft, and the brush resin is inserted inside the molded resin cylinder. An inner conductor that extends in the axial direction while sloping in the circumferential direction is embedded, and the outer riser portion is extended radially from one end of the brush contact portion, and is electrically insulated from these both between the outer riser portion and the armature core. In addition, a commutator element is disclosed in which the inner riser portion extends radially from one end of the inner conductor. By doing so, the coil end can be omitted.

[0004]

The coil end portion of the conventional armature coil described above reaches about half the axial length of the armature core, thereby increasing the overall armature length and increasing the physical size of the commutator type rotary electric machine. However, there is a problem that the size is increased.
Further, there is a disadvantage that the armature coil resistance increases by the amount corresponding to the coil end portion and the output decreases.

Further, there is a problem that the speeding up of the motor is hindered by the centrifugal force acting on the coil end portion, and the reduction in size and weight and the increase in output of the commutator-type rotary electric machine are hindered. On the other hand, if the riser portion of the commutator piece disclosed in JP-A-63-194541 is extended in the radial direction and directly connected to the armature conductor coming out of the slot, the coil end can be omitted. The centrifugal force exerted on the commutator pieces whose mass and radial length have been significantly increased is greatly increased.

According to the above publication, the commutator pieces are supported by being buried in two steps in the surface of the molded resin cylinder and in the interior thereof. Decreases the support strength of the piece.
In addition, at the time of high-speed rotation, the mold resin cylinder cannot support the excessive centrifugal force of the commutator piece, and there is a problem that the commutator piece separates from the mold resin cylinder. Further, the inner conductor embedded in the mold resin cylinder and extending in the axial direction turns or bends instead of the coil end. Therefore, the inner conductor needs to have a complicated shape and arrangement, which is not easy to manufacture. Further, the molded resin cylinder must receive the resistance heat generated by the armature conductor embedded in a larger amount than the conventional commutator, in addition to the brush friction heat, and the heat resistance of the molded resin cylinder also becomes a problem. In addition, the coil end on the non-commutator side remains as it is, and after all, high-speed rotation higher than the number of rotations that this coil end can endure cannot be expected.

One of the objects of the present invention is to realize an armature of a commutator type rotating electric machine whose axial length can be reduced. It is another object of each configuration of the present invention to realize an armature of a commutator-type rotary electric machine that can reduce a decrease in output due to a reduction in resistance loss of a coil end portion.

Further, each configuration of the present invention provides an armature of a commutator type rotating electric machine capable of realizing high speed, small size, light weight and high output by reducing the centrifugal force acting on the coil end portion. One of its purposes. Further, achievement of a function and effect unique to each of the components of the present invention described below constitutes a further individual purpose of each of the components.

[0009]

A commutator-type rotary electric machine according to a first configuration of the present invention has an upper part penetrated in two stages, upper and lower, for each slot formed in an outer peripheral portion of an armature core in an axial direction. A conductor part and a lower conductor part, an inner conductor part individually extended in a radially inward direction along one end face of the armature core from one end of each of the lower conductor parts, and one end of each of the upper conductor parts. An armature coil including an outer conductor portion individually extended in a radially inward direction along the inner conductor portion; and the inner conductor interposed between the inner conductor portion and an end face of the armature core. An inner insulator that electrically insulates the portion from the armature core; and an outer insulator that is interposed between the inner conductor and the outer conductor to electrically insulate the outer conductor from the inner insulator. An insulator consisting of an insulator fitted to the rotating shaft so as to be electrically insulated adjacent to the armature core. Comprising a child holder, and a commutator having a plurality of commutator segments in which a pair of the outer conductor part and the inner conductor part is electrically connected is fixed to the outer periphery of the commutator holder, the same Through the commutator piece
Diameter of the inner conductor and the outer conductor connected to each other
Outer ends in the direction are spaced apart from each other by a predetermined slot pitch in the circumferential direction.
It is characterized by being placed .

According to a second aspect of the present invention, there is provided a commutator-type rotating electric machine according to the first aspect, wherein the inner insulator is interposed between the armature core and the inner end face of the commutator piece. Is a further feature. In the commutator-type rotating electric machine according to a third configuration of the present invention, in the first configuration, the inner end of the inner conductor portion is bent in the axial direction while being fixed to the outer peripheral surface of the commutator piece. The point is a further feature.

The commutator-type rotating electric machine according to a fourth configuration of the present invention further includes a point that the inner end of the outer conductor is fixed to the outer peripheral surface of the inner conductor in the third configuration. Features. In the commutator-type rotating electric machine having a fifth configuration of the present invention, in the fourth configuration, the inner end of the outer conductor is bent in the axial direction while being fixed to the outer peripheral surface of the inner conductor. The point is a further feature.

A sixth aspect of the present invention provides a commutator-type rotating electric machine according to the first to fifth aspects, in which the upper conductor portion and the outer conductor portion are integrally formed by a bent coil wire. It has become a feature. A commutator-type rotating electric machine having a seventh configuration according to the present invention includes the first to fifth configurations, wherein:
A further feature is that the lower conductor portion and the inner conductor portion are integrally formed by a bent coil wire.

An eighth aspect of the present invention provides a commutator-type rotating electric machine according to the first to fifth aspects, wherein the upper conductor portion and the outer conductor portion are formed separately and are joined to each other. And A commutator-type rotating electric machine having a ninth configuration according to the present invention is further characterized in that, in the first to fifth configurations, the lower conductor portion and the inner conductor portion are formed separately and are joined to each other. .

According to a tenth aspect of the present invention, there is provided a commutator type rotating electric machine according to the first to ninth aspects, wherein the inner insulator comprises:
A further feature is that the upper conductor portion and the lower conductor portion individually have conductor holes penetrating therethrough.

[0015]

According to the first structure of the present invention,
The commutator piece extends substantially in the axial direction along the outer peripheral surface of the rotating shaft as in the related art. On the other hand, the inner conductor and the outer conductor of the armature coil corresponding to the conventional coil end are extended radially inward while being electrically insulated by the inner insulator and the outer insulator. Of course, at least one of the inner conductor portion and the outer conductor portion is circumferentially curved by one coil pitch. Further, each pair of the inner conductor portion and the outer conductor portion is individually electrically connected to each commutator piece.

According to the present invention, the following operation and effect can be obtained. First, since the axial lengths of the inner conductor portion and the outer conductor portion corresponding to the coil end portion are almost only their thicknesses, as a result, the axial length of the armature of the commutator type rotating electric machine is reduced, and the resistance is reduced. Reduction of output reduction due to reduction of loss is realized. Also, the centrifugal force acting on the inner conductor and the outer conductor corresponding to the conventional coil end, the mass and average diameter of the inner conductor and the outer conductor are significantly reduced as compared with the conventional coil end. Therefore, the power consumption can be greatly reduced, and as a result, a high-speed, small-sized, light-weight, and high-output commutator-type rotating electric machine can be realized.

According to the second configuration of the present invention, in the first configuration, the inner insulator is further interposed between the armature core and the inner end surface of the commutator piece. The inner end face of the commutator piece can also be electrically insulated at the same time by the inner insulator electrically insulating from the end face of the core. According to the third configuration of the present invention, in the first configuration, the inner end portion of the inner conductor portion further includes:
Since it is fixed to the outer peripheral surface of the commutator piece and refracted in the axial direction, it is possible to secure a sufficient contact area between the inner conductor part and the commutator piece without being limited by the thickness of the inner conductor part. it can.

According to the fourth aspect of the present invention, in the third aspect, the inner end of the outer conductor is fixed to the outer peripheral surface of the inner conductor, so that the inner conductor is bent in the axial direction. Even so, the outer conductor portion and the commutator piece can be electrically connected well via the axially bent portion of the inner conductor portion. According to the fifth configuration of the present invention, in the fourth configuration, the inner end of the outer conductor is further axially refracted while being fixed to the outer peripheral surface (radially outward end surface) of the inner conductor. Therefore, the contact area between the outer conductor and the inner conductor can be sufficiently ensured without being limited by the thickness of the outer conductor.

According to the sixth or seventh configuration of the present invention, the first
Further, in the configurations of to 5, an upper conductor portion and an outer conductor portion,
Alternatively, since the lower conductor portion and the inner conductor portion are integrally formed by the bent coil wire, the trouble of connecting the both can be saved, and the resistance loss can be reduced. Eighth of the invention
Or according to the ninth configuration, in the first to fifth configurations,
Since the upper conductor portion and the outer conductor portion, or the lower conductor portion and the inner conductor portion are formed separately and joined to each other,
Slot insertion of the upper conductor portion or the lower conductor portion is facilitated.

According to the tenth structure of the present invention, in the first to ninth structures, the inner insulator further has conductor holes individually penetrated by the upper conductor portion and the lower conductor portion. The electrical insulation of the lower conductor is further improved.

[0021]

【Example】

(Embodiment 1) FIGS. 1 to 3 show an example in which the present invention is applied to a DC motor for an automobile starter. FIG. 1 shows an axial half-section of this motor. The armature 1 has an armature core (an armature iron core in the present invention) 3 formed by laminating a plurality of disk-shaped steel plates. The armature core 3 is fitted and fixed to a rotating shaft 20. A plurality of slots 4 are formed in the outer peripheral portion of the armature core 3 in the axial direction, and in each of the slots 4, a lower coil (a lower conductor according to the present invention) of the armature coil 2 made of a round conductor with an insulating film is formed. Part) 2a and an upper coil (upper conductor part in the present invention) 2b are respectively fitted in upper and lower two stages. 5 is a slot insulator shown in FIG.
The lower coil 2a and the upper coil 2b are electrically insulated from the inner surface of the slot 4.

The rotating shaft 20 has a bottomed cylindrical center case.
The bush 12 is rotatably supported by a shaft hole of the end frame 10 through a bush 12a, and is fitted to a peripheral wall of the center case 12 to close the opening thereof.
It is rotatably supported via Oa. Center case
Field poles 11 composed of a plurality of pairs of permanent magnets are fixed at equal intervals in the circumferential direction to the inner peripheral surface of the source 12, and the radial inner end face of each field pole 11 is attached to the outer peripheral surface of the armature core 3. They face each other via a small gap.

A brush holder 91 is fastened to the inner end wall of the end frame 10 via an insulating plate 90 by bolts 92, and a brush 93 is slidably held in the brush holder 91 in a radial direction. Also, brush spring 9
4 urges the outer end face of the brush in the centripetal direction. The insulating plate 90, the brush holder 91, the brush 93 and the brush spring 94 constitute the brush device 9.

A commutator 8 is fitted and fixed to a slightly smaller right end of the rotary shaft 20 located on the brush side. The commutator 8 is formed by molding of an electrically insulating resin, is fitted to and fixed to the rotating shaft 20, and is fixed to a thick-walled cylindrical commutator holder (molded resin tube portion) 81 and embedded in the commutator holder 81. And a plurality of commutator pieces 82 whose surfaces are exposed on the outer peripheral surface of the commutator holder 81. Each commutator piece 82 extends substantially in the axial direction like a normal commutator at predetermined intervals in the circumferential direction. Naturally, the end face of the brush 93 in the radial direction is pressed against the commutator piece 82 by the brush spring 94.

Hereinafter, the armature coil 2 which is a feature of the present invention will be described.
Hereinafter, the coil end portion will be described in detail. On the end face of the armature core 3 on the commutator 8 side, an insulating plate (inner insulator in the present invention) 6 made of a disc made of an electric insulating material such as resin is fixed. The insulating plate 6 is fitted to a slightly smaller right end of the rotating shaft 20 and is axially sandwiched between a step surface of the rotating shaft 20 and an inner end surface of the commutator holder 81 of the commutator 8. . The axial and inner end surfaces of the respective commutator pieces 82 embedded in the outer peripheral portion of the commutator holder 81 are in contact with the insulating plate 6 to be electrically insulated from the armature core 3. Is sandwiched.

The lower coil 2a and the upper coil 2b of the armature coil 2 individually pass through conductor holes 6a and 6b (see FIG. 4) opened in the outer peripheral portion of the insulating plate 6.
In this embodiment, as shown in (not shown) 4, the conductor holes 6a and 6b are opened in a circular shape, and the diameter thereof is slightly larger than the diameters of the lower coil 2a and the upper coil 2b. As a result, the insulating plate 6 becomes the armature coil 2
To enhance the centrifugal resistance.

After the lower coil 2a comes out of the conductor hole 6a, it is integrally connected to the inner conductor 2A. As shown in FIG. 3, the inner conductor portion 2A is bent obliquely to the circumferential direction and the radial direction and at right angles to the axial direction, and is bent to the end face of the armature core 3 with the insulating plate 6 interposed therebetween. It is spirally curved inward in the radial direction by about １ ／ coil pitch. The inner end of each inner conductor 2A is bent outward in the axial direction while abutting on the outer peripheral surface of each commutator piece 82.

Similarly, the upper coil 2b is integrally connected to the outer conductor 2B after coming out of the conductor hole 6b. As shown in FIG. 3, the outer conductor 2B is bent obliquely with respect to the circumferential direction and the radially inner direction and at right angles to the axial direction, and along the inner conductor 2A with the insulating plate 7 interposed therebetween. It is spirally curved in a radially inward direction and a circumferential direction by about 1/2 coil pitch in a direction opposite to the inner conductor portion 2A. The inner end of each outer conductor 2B is fixed to the outer peripheral surface of each inner conductor 2A. The insulating plate 7 is made of a hard electric insulating resin plate in this embodiment like the insulating plate 6.

After the end of the lower coil 2a on the anti-commutator side of an arbitrary slot exits from the slot 4, it is bent obliquely in the circumferential and radial directions and at right angles to the axial direction. At a predetermined interval from the end face of the armature core 3, it is spirally curved inward in the radial direction by about コ イ ル coil pitch, and thereafter, after being bent outward by a predetermined length at the radially inner end in the axial direction, in the circumferential direction and It is bent obliquely to the radial direction and at right angles to the axial direction, and spirally extends radially outward and circumferentially at a predetermined distance from the inner conductor portion extending in the radial direction from the lower coil 2a. Curved by about 1/2 coil pitch,
After that, it is refracted in the axial direction at the radially outer end to become the upper coil 2 b in the predetermined slot 4.

In this embodiment, it is assumed that the coil end portion on the side opposite to the commutator is formed before the armature coil 2 is inserted into the slot 4. Although omitted in this embodiment, each inner end of the coil end is fitted to the rotating shaft 20 to prevent the centrifugal force applied to the coil end of the armature coil 2 on the anti-commutator side. You may add the cylinder body which latches so that insulation is possible.

Hereinafter, the wiring method of the armature coil 2 will be described. First, the lower end coil 2a and the upper end coil 2b whose end portions on the commutator side on which the coil ends on the anti-commutator side are formed are fitted in the respective slots 4 sequentially, and simultaneously the conductor holes 6a, 6b of the insulating plate 6 are simultaneously inserted. Let through. Then, the lower coil 2
a and the distal end of the upper coil 2b are bent inward in the radial direction as described above, and further curved in the circumferential direction to form the inner conductor 2A.
Is refracted outward in the axial direction. After that, the commutator 8 is fitted to the rotating shaft 20.

Finally, the inner end of the inner conductor 2A is individually joined to each commutator piece 82 by laser welding or the like, and the inner end of the outer conductor 2B is further joined to the inner end of each outer conductor 2A. And are individually joined by laser welding or the like. After the inner conductor 2A is bent in the radial direction and before the outer conductor 2B is bent in the radial direction, the insulating plate 7 is fitted to the rotating shaft 20 and the inner periphery of the insulating plate 7 is The end is fitted into the outer peripheral surface of the inner end portion of the inner conductor portion 2A extending in the axial direction.

According to this embodiment, the coil end of the armature coil 2 is shortest in the axial direction, and the axial length of the armature 1 can be significantly reduced.
The weight can be reduced in size and weight. Further, since the distance from the outlet of the slot 4 to the commutator piece 82 can be minimized, the coil resistance loss can be reduced, and the output of the motor itself can be improved accordingly.

Further, since the centrifugal force (having a positive correlation with the mass and the average diameter) applied to the coil end portion can be reduced, it is possible to reduce the size, weight, output and speed. In contrast to the above embodiment, the armature coil 2 is formed in advance on the commutator side like the coil end portion on the anti-commutator side, and the coil end portion on the anti-commutator side is A configuration on the commutator side can also be used.

In the above embodiment, the lower coil 2a and the upper coil 2b are formed integrally and bent with the outer conductor 2B and the inner conductor 2A. It is also possible to integrate them. The armature coil 2 is not limited to a covered round wire, but may be a flat wire, a square wire, or the like. Further, instead of the laser welding, means such as brazing may be employed.

The inner conductor 2A and the outer conductor 2B can be bonded to the insulating plates 6 and 7, and the insulating plate 6 can be bonded to the armature core 3. Further, the inner conductor portion 2A and the commutator piece 82 may be integrally formed. (Embodiment 2) Another embodiment of the armature of the commutator type rotating electric machine according to the present invention will be described with reference to FIGS.

This embodiment is equivalent to the embodiment in which the inner conductor 2A and the outer conductor 2B and the commutator piece 82 are integrally formed. In this embodiment, the same operation and effect as in the first embodiment can be obtained. In addition, it is characterized in that additional effects such as the connection between the commutator piece and the armature coil can be omitted. Only the differences from the first embodiment will be described below.

5, a circular hole 20 is provided at the right end of the rotary shaft 20 in FIG.
a is bored in the axial direction, and the bush 10a is accommodated therein. On the other hand, a projection 100 for a bearing projects in the center of the end frame 10 in the axial direction, and is fitted into the bush 10a. The inner conductor 2A and the outer conductor 2B, which are electrically connected to each other, extend in the axial direction at a predetermined distance from the outer peripheral surface of the right end of the rotating shaft 20. The axially extending portions of the inner conductor portion 2A and the outer conductor portion 2B are hereinafter referred to as commutator pieces 2c and 2d. Each pair of both commutator pieces 2c and 2d overlaps in the radial direction,
The outer peripheral end face of the commutator piece 2c and the inner peripheral end face of the commutator piece 2d overlap.

On the other hand, in FIG.
01 (commutator holder according to the present invention) 1
Numeral 02 is fitted in the gap between the commutator piece 2c and the rotary shaft 20, and the outer cylindrical part 103 extending to the left in the axial direction from the outer periphery of the flange 101 of the resin cylinder 102 is the tip of the commutator piece 2d. This prevents the commutator pieces 2c and 2d from separating in the centrifugal direction.

Since the centrifugal resistance of the resin cylinder 102 is limited, a stopper ring 105 made of a metal cylinder having high tensile strength is press-fitted into the right end of the rotating shaft 20. The stopper ring 105 also has an outer cylindrical portion 107 extending leftward in the axial direction from the outer peripheral end thereof. The outer cylindrical portion 107 is substantially connected to the commutator pieces 2c and 2d via the outer cylindrical portion 103. Centrifugal force. The resin cylinder 102 electrically insulates the stopper ring 105 from the commutator pieces 2c and 2d.

Further, the end frame 10 is fixed to the center case 12 by through bolts (not shown).
In this embodiment, a brush support plate 110 made of a metal disk is sandwiched between the end frame 10 and the center case 12. On the inner peripheral side of the brush support plate 110, a plurality of cylindrical portions 112 into which the brushes 111 are fitted are formed at predetermined circumferential intervals, and a resin cylindrical portion 113 having both ends opened is fitted into the cylindrical portion 112. Fixed, resin cylinder 113
A metal tube 114 serving as a collecting electrode of the brush 111 is molded.

The brush 111 is fitted in a metal cylinder 114 and is urged by a spring 115 in the inner diameter direction. The base end of the spring 115 is locked by a resin lid 116, and the resin lid 116 is fixed to the brush support plate 110 by screws 117. Hereinafter, the assembly of this device will be described. First, the armature 1, that is, the armature coil 2 is assembled to the armature core 3, and is manufactured integrally with the rotating shaft 20. The left end of the rotating shaft 20 of the armature 1 is attached to the bush 12 a of the center case 12. Insert.

Next, a brush 111, a spring 115,
When the brush support plate 110 without the lid 116 is
The brush 111 and the spring 115 are put in the state of being temporarily fixed to the right end face of 2, and the lid 116 is fixed. Finally, the protrusion 100 of the end frame 10 is fitted into the bush 10a, and the end frame 10 is fixed to the center case 12.

Of course, the brush support plate 110 may be formed integrally with the center case 12. In this way, the commutator structure can be simplified, and the centrifugal force of the inner conductor 2A and the outer conductor 2B can be carried by the stopper ring 105.

A resin cylinder 200 and a metal cylinder 201 are wound around the commutator pieces 2c and 2d for restraining them. Reference numeral 203 in FIG. 6 denotes an insulating resin body interposed between the commutator pieces 2c and 2d.

[Brief description of the drawings]

FIG. 1 is an axial half-sectional view of a starter motor having an armature structure of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a front view in the axial direction showing a coil end portion of the armature coil on the commutator side of FIG. 1;

FIG. 4 is a partially enlarged front view of the insulating plate 6 of FIG.

FIG. 5 is a half sectional view showing another embodiment.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

[Explanation of symbols]

1 is an armature, 2 is an armature coil, 2A is an inner conductor, 2
B is an outer conductor, 2a is a lower coil, 2b is an upper coil, 3 is an armature core (armature core), 4 is a slot, 6
Is an insulating plate (inner insulator), 6a and 6b are conductor holes, 7 is an insulating plate (outer insulator), 8 is a commutator, 20 is a rotating shaft, 81
Is a commutator holder, and 82 is a commutator piece.

Claims (10)

(57) [Claims] An upper conductor portion and a lower conductor portion which are inserted in upper and lower two stages for each slot formed in the outer peripheral portion of the armature core in the axial direction, and one end of each of the lower conductor portions. An inner conductor portion individually extending radially inward along the end face of the armature core; and an outer conductor individually extending radially inward along the inner conductor portion from one end of each of the upper conductor portions. An inner insulator interposed between the inner conductor and an end face of the armature core to electrically insulate the inner conductor from the armature core; and an inner conductor. An outer insulator interposed between the outer conductor and the outer conductor to electrically insulate the outer conductor from the inner insulator, and fitted to the rotating shaft adjacent to the armature core so as to be electrically insulated. A commutator holder made of an insulator, and fixed to an outer peripheral portion of the commutator holder; Said inner said outer conductor portion and an inner conductor of the pair each and a commutator having a plurality of commutator segments which are electrically connected, are connected to each other through the same said commutator segments in
Both radial outer ends of the conductor and the outer conductor are circumferentially predetermined
A commutator-type rotating electric machine, which is arranged apart from a slot pitch . 2. The armature of a commutator-type rotary electric machine according to claim 1, wherein said inner insulator is interposed between said armature core and an inner end surface of said commutator piece. 3. An inner end portion of the inner conductor portion is bent to an axial direction while being fixed to an outer peripheral surface of the commutator piece.
An armature of the commutator-type rotary electric machine according to the description. 4. The armature of a commutator-type rotary electric machine according to claim 3, wherein an inner end of said outer conductor is fixed to an outer peripheral surface of said inner conductor. 5. The commutator-type rotating electric machine armature according to claim 4, wherein an inner end of said outer conductor is fixed to an outer peripheral surface of said inner conductor and is bent in an axial direction. 6. The armature of a commutator-type rotary electric machine according to claim 1, wherein said upper conductor portion and said outer conductor portion are integrally formed by a bent coil wire. 7. The armature of a commutator-type rotary electric machine according to claim 1, wherein said lower conductor portion and said inner conductor portion are integrally formed by a bent coil wire. 8. An armature for a commutator-type rotary electric machine according to claim 1, wherein said upper conductor portion and said outer conductor portion are formed separately and are joined to each other. 9. An armature for a commutator-type rotary electric machine according to claim 1, wherein said lower conductor portion and said inner conductor portion are formed separately and joined to each other. 10. The inner insulator has conductor holes individually penetrated by the upper conductor portion and the lower conductor portion.
The armature of the commutator-type rotary electric machine according to any one of claims 9 to 13.