JPH01318527A - Mold commutator of rotary electric machine and manufacture thereof - Google Patents

Abstract

PURPOSE:To improve binding force of insulating molding materials between risers and with respect to edge faces of risers by providing a non-smooth surface forming element to the edge face of the riser and coating the edge face of the riser with the non-smooth surface forming element with the insulating molding materials. CONSTITUTION:First of all, total No. of commutator pieces 4 with a riser are press formed in series from a conductive cylinder body in the circumferential direction through a rib, and, at the same time, a groove 10 with a plurality of threads is formed on the edge face 5a of the riser 5 of the commutator pieces 4 at a proper interval. After that, insulating molding materials 6a, 6b and 6c are filled into a slit G1 of intercommutator pieces 4, a slit G2 between risers 5 and the internal circumference of the commutator pieces 4 as a unit to made a molding, but, at the same time, the edge face 5a of the riser 5 with the groove 10 is also coated with the insulating molding material 6d. According to the constitution, the insulating molding material 6d encroaches on the groove 10, binding force of the edge face 5a of the riser 5 and the insulating molding material 6d increases, and the increase of the binding force has an influence upon the filled insulating molding material 6d between the risers 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a molded commutator for a rotating electric machine and a method for manufacturing the same.

[Conventional technology]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure and manufacturing method of a conventional molded commutator for a rotating electrical machine (for example, a motor) will be explained based on FIGS. 19 to 22.

FIG. 19 is a half-cut sectional view 2011(a) showing, for example, the armature structure of a conventional starter motor.

(b) shows a partially omitted left side view and a half-cut sectional view showing the structure of the molded commutator.

In FIG. 19, a core 2 is fixed approximately at the center of a rotor shaft 1, and a plurality of coils 3 are embedded in slots formed on the outer periphery of the core. One end of the coil 3 is drawn out to the riser S side of the commutator piece 4 , and is fitted into the slot 9 of the riser 5 to be electrically connected to each commutator piece 4 .

The number of commutator pieces 4 is the same as that of the coil 3, and they are spaced at a predetermined interval G in the circumferential direction.
1 and is placed. Each commutator piece 4 has a riser 5 formed on one end of its outer periphery, as shown in FIG. 20(a).
, (b), a slot 9 is formed in the riser 5. Furthermore, a zero engagement portion 8 is formed protruding from the inside of the commutator piece 4 over the length direction of the commutator piece.

The insulating molded material 6 includes an insulating resin 6a filled between the commutator pieces 4 (slits) G1, an insulating resin 6b filled between the risers 5 (slits) G2, and an inner periphery of the commutator pieces 4. The insulating resin 6c filled in the riser 5 and the insulating resin 6d covering one end of the riser 5 are integrally molded.

In addition, FIG. 19.

In Fig. 20(b), G1 between the commutator pieces and G2 between the risers are shown out of position, but this is due to the perspective of the drawing, and in reality, G1 and G2 are are on the same line and are continuous. Furthermore, although the slot 9 provided in the riser 5 is shown offset from the center of each commutator piece 4 in the drawing, it is actually formed to be aligned with the center of each commutator piece 4. There is. Slot 9 is
After the coil 3 is fitted, it is caulked (slot 9 in FIG. 19 represents the state after caulking), and the coil 3 is firmly connected to the riser 5 by this caulking.

7 is a bushing through which the rotor shaft 1 is inserted; the bushing 7, the insulating resins 6a, 6b, 6c, 6d, and the commutator piece 4 are integrally molded to form a molded commutator. Then, this molded commutator is fitted and fixed onto the rotor shaft 1 via the bushing 7.

The commutator rotates together with the rotor shaft 1, and in this case centrifugal force acts on the commutator pieces 4, but the commutator pieces (including the riser)
Due to the adhesion of the insulating molded materials 6a to 6d to the commutator piece 4 and the engagement between the convex engaging portion 8 provided inside the commutator piece 4 and the insulating molded material 6c, the commutator piece 4 is held and the commutator piece 4 is held. This prevents the withdrawal of

Next, an example of manufacturing the commutator 4 will be described based on FIGS. 20 to 22.

FIG. 21 is a perspective view showing an intermediate manufactured product 4' of the commutator before molding and the commutator pieces 4 are not yet separated, and FIG. 22(a) is the left side of FIG. 21 with some parts omitted. 22(b) is a longitudinal sectional view thereof, and FIG. 22(c) is a partially omitted right side view of FIG. 21.

As shown in FIG. 21, a commutator intermediate product 4' is obtained by molding a conductive tube such as a copper pipe in one press operation. Through this molding operation, the mold filling slits G1 between the commutator pieces 4 and the mold filling slits G2 between the risers 5 are formed, and the ribs 20 are also formed. The ribs 20 are formed between the commutator pieces 4 and on the back surface of the riser 5 corresponding to the slits Gl and G2. This rib 20
is removed after filling the slits Gx, Gz and the inner periphery of the commutator piece 4 with an insulating molding material (insulating resin).

Therefore, when manufacturing a molded commutator, the 21st
After manufacturing the commutator intermediate product 4' as shown in the figure, with the bushing 7 placed inside the intermediate product 4', insulating resin is injected and filled into the slit Gxt Gt and the inner circumference of the commutator 4, etc. Perform molding.

The slit Gz has a wide entrance and a narrow inner part, and the surface of the slit G2 is made smooth in order to facilitate the cutting operation of the medium mold used for molding the intermediate product 4'. After the above-mentioned molding, the upper center of each riser 5 is cut to form a slot 9 and a rib 2.
By removing 0, a molded commutator is manufactured. When installing an armature coil on this molded commutator,
This is done by fitting the coil 3 into the slot 9 and applying caulking, soldering, or the like.

Conventional examples of molded commutators include those disclosed in, for example, Japanese Unexamined Utility Model Publication No. 60-117676 and Japanese Unexamined Patent Publication No. 61-98139.

[Problem to be solved by the invention]

In the above-mentioned prior art, as mentioned above, in the process of producing the intermediate product 4' of the commutator, the slit G2 between the risers 5 is
In order to facilitate the work of punching out medium-sized pieces, the entrance part is wide and the deep part is narrow, and the punching surface of the slit G2 is smooth. Therefore.

Even if the insulating molding material (insulating resin) 6b is filled and molded into the slit G2, the insulating molding material 6b is easily pulled out in the left direction in FIG. 21, especially when cutting the slot 9 or caulking it. The force of the impact could cause it to come off to the left or to the outer circumference. This omission of the insulating molded material 6b is usually caused by
This accompanies peeling of the insulation molding material 6d formed in close contact with one end surface of the riser 5.

However, such omission or peeling of the insulating molded materials 6b and 6d not only impairs the commercial value of the commutator, but also damages the riser 5.
If the rotating electrical machine is used with the insulating molded material 6b removed between the risers 5, conductive dust such as carbon dust may accumulate in the removed portion, causing a short circuit between the risers 5. In addition, in the case of a rotating machine with high-speed rotation specifications such as a starter, a large centrifugal force acts on the riser with the largest outer diameter among the commutators, but as mentioned above, the insulating molded materials 6b and 6d near the riser If a part of the insulating molded material falls out or peels off, the adhesion of the insulating molding material to the riser weakens, and even if the 0 engagement part 8 exists, centrifugal force prevails, causing problems such as the so-called floating phenomenon on the riser side of the commutator piece. occurs.

The present invention has been made in view of the above points, and its purpose is to increase the bonding strength of the insulating molding material between the risers of a molded commutator and to the riser end face, so that it can be used when forming slots, caulking, etc. Even if shock is applied to the insulating molded material, it will prevent the insulating molded material from coming off or peeling off between the risers or from the end face of the riser. Furthermore, even if the rotating electric machine rotates at high speed, the riser of the commutator piece will not float or come off. 6 [Means for solving the problem] The above purpose is to provide a molded commutator that can effectively prevent This can be achieved by applying the following means to a commutator formed by integrally filling and molding materials.

That is, the first means for solving the problem is to provide at least one type of non-smooth surface forming element such as a depression, a groove, or a notch to make the riser end surface a non-smooth surface, and to form this non-smooth surface. The riser end face with the element is covered with the insulating molding material.

Further, the second problem-solving means includes at least one type of non-smooth surface forming element such as a depression, a groove, a notch, etc., for making the riser side surface a non-smooth surface, on the opposing riser side surfaces between the risers. The insulating molding material fills the space between the riser side surfaces with the non-smooth surface elements.

The third problem-solving means is the above-mentioned first problem. By combining the second problem-solving means, non-smooth surface forming elements are formed on the riser end face and riser side face, and these are molded with an insulating molding material.

In addition, if we look at the means to solve these problems from the perspective of the manufacturing process of molded commutators, we can mold all the commutator pieces with risers from a conductive cylinder, connecting them in a series in the circumferential direction via ribs. processing, a step of integrally filling and molding an insulating molding material between the commutator pieces, between the risers, and the inner periphery of the commutator pieces; and after the molding, rotating the riser. In a method of manufacturing a molded commutator through a step of forming a slot for connecting a child coil, a step of removing the ribs, etc., the end face of the riser is formed with depressions, grooves, notches, etc. in advance before the molding step. forming at least one type of
The riser end surfaces may be non-smooth surfaces, or the riser side faces facing each other may be indented in advance before the molding process.

At least one type of groove, notch, etc. is formed to make the riser side surface a non-smooth surface, and during the subsequent molding process, the insulating molding material is also applied to the riser end face and between the riser side faces, etc., so that the molding is performed. conduct.

[Effect]

According to the present invention having such a configuration, for example, the first
In the problem solving means, the riser end surface becomes a non-smooth surface by forming depressions, grooves, notches, etc. on the riser end surface. The presence of this non-smooth surface forming element increases the engagement and contact area between the riser end face and the insulating molded material covering the riser end face, thereby increasing the bonding force between the two. The insulating molded material covering this riser end surface plays a role of supporting the filled insulating molded material between adjacent risers from the riser end surface side, so as mentioned above, the bonding force between the riser end surface and the insulating molded material is As this increases, the supporting force for the insulating molded material between the risers also increases. Therefore,
To effectively prevent the insulating molded material from coming off or peeling off between risers or from the riser end face even if an impact is applied to the insulating molded material during slot molding, slot caulking, etc. in a mold commutator manufacturing process.

In addition, when a rotating electric machine rotates, centrifugal force acts on the commutator pieces, and in particular, the centrifugal force on the riser side of the commutator piece is the largest, and the riser side tends to float during high-speed rotation. By increasing the bonding force between the end face and the insulating molded material, the bonding force of the insulating molded material to the riser overcomes the centrifugal force, preventing the riser from floating or coming off.

Next, in the case of the second problem solving means, depressions and grooves are formed in the opposing riser sides between the risers.

Make the riser side surface a non-smooth surface by forming notches, etc.

In this case, the insulating molded material engages with the non-smooth surface forming elements on the riser side surface, increasing the bonding force between the riser side surface and the insulating molded material. Therefore, similarly to the first problem solving means, the present problem solving means also prevents the insulating molded material from coming off from between the risers even if an impact force is applied to the insulating molded material during the molded commutator manufacturing process. Furthermore, when a rotating electric machine is used, floating and detachment of the riser side of the commutator piece is effectively prevented.

In the case of the third problem solving means, the above-mentioned first. This is because it combines the second problem-solving method.

The function of preventing the insulating molding material from falling out and peeling, and the function of preventing riser floating can be exhibited even more effectively.

〔Example〕

Embodiments of the present invention will be described based on the drawings.

FIG. 1 is a half-cut sectional view showing an armature of a rotating electric machine according to a first embodiment of the present invention, and FIG. 3(b) is a half-cut sectional view thereof, FIG. 3 is a partially enlarged sectional view of FIG. 2(b), and FIG. 4 is a sectional view taken along the line AA of FIG. 3. Note that in this embodiment and other embodiments to be described later, the same reference numerals as in the conventional example described above indicate the same or common elements, and since the explanation thereof has already been described, the explanation thereof will be omitted.

Therefore, in the first embodiment, a plurality of grooves 10 (four grooves in this example) are formed at appropriate intervals in the circumferential direction on the end surface 5a of the riser 5 of the commutator piece 4.

This groove 10 makes the end face of the riser 5 a non-smooth surface, but if the depth of the groove 10 is too deep, the cross-sectional area of the riser will be greatly reduced and the electrical resistance will increase, so this situation will not occur. It is necessary to form it at a certain depth. Specifically, it is preferable that the depth of the groove portion 10 be approximately the same as the thickness of the insulating molded material 6d covering the riser end face.

Such a groove 10 is press-formed at the same time when all the commutator pieces 4 are simultaneously pressed from a conductive pipe. That is, as mentioned in the [Prior Art] section, the manufacturing process of the commutator begins with the steps shown in FIGS. 21 and 2.
As shown in Figure 2, first, all the commutator pieces 4 with risers are press-formed from a conductive cylinder (copper pipe) in a series in the circumferential direction via ribs 20 (process of intermediate product 4'). )
However, in this case, since the riser 5 is placed on top and the middle die is pressed from top to bottom with a press, the groove 10 can be easily formed at the end of the riser 5 at the same time.

After this press molding, an insulating molded material 6a is formed on the slits G1 between the commutator pieces 4, the slits G2 between the risers 5, and the inner periphery of the commutator pieces 4.

6b and 6c are integrally filled and molded, and the end surface 5a of the riser 5 with the groove 10 is also coated with the insulating molding material 6d.

With such a configuration, the insulating molded material 6d bites into the groove 10, increasing the bonding force between the end surface 5a of the riser 5 and the insulating molded material 6d.

Since this insulating molded material 6d is continuous with the filled insulating molded material 6b between adjacent risers G2,
When the bonding force of the insulating molded material 6d on the riser end face increases, the influence of this increased bonding force increases the filling insulating molded material 6 between the risers.
It also extends to b.

Therefore, even if impact such as slot cutting force or pressing is applied to the insulating molded material during slot molding or slot caulking in the mold commutator manufacturing process.

Prevents insulating molding material from coming off or peeling off between risers or from the riser ends. As a result, it is possible to increase the product value of the molded commutator, eliminate problems such as commutator short-circuit accidents caused by detachment of the insulating molding material, and improve the reliability of the molded commutator. In particular, according to this embodiment, by making the riser end face a non-smooth surface, it is possible to use an insulating molding material with relatively poor adhesion.

In particular, it becomes easy to change from asbestos-containing resin to asbestos-free resin.

In addition, by strengthening the bond between the riser and the insulating molding material,
When using a rotating electric machine, it is possible to effectively prevent the riser side of the commutator piece from floating due to centrifugal force.

FIG. 5 is a measurement of the unevenness of the sliding surface (the floating state of the commutator piece) of a conventional commutator piece 4 without grooves 10, and shows the sliding surface diameter φ30. Number of commutator pieces: 21° Rotation speed: 25,000 rpm
m, which was operated for 5 minutes. In the measurement waveforms shown in FIGS. 11A and 11B, each wave represents the height level of the sliding surface of one commutator piece. (a) is the amount of unevenness in section B (on the opposite riser side of the commutator) in Figure 3. As a result of measuring the amount of unevenness, the largest amount of unevenness among the unevenness between the commutator pieces in section B is the largest. 75μ
Met.

In addition, (b) is part 0 of Fig. 3 (riser side of commutator piece)
The amount of unevenness on part 0 was 90 μ at the maximum. On the other hand, FIG. 6 shows the measurement of the unevenness of the sliding surface of the commutator piece 4 of this embodiment in which grooves 10 are provided on the riser end face. The amount of unevenness is 15μ, 0
By reducing the unevenness on the sliding surface of the commutator piece to more than 0, the maximum amount of unevenness on the sliding surface of the commutator piece is 40μ, which is a significant improvement over the conventional method. performance can be improved.

FIGS. 7 and 8 show a modification of the first embodiment (the second embodiment).
Third Embodiment), these embodiments are disclosed in, for example, Japanese Patent Laid-Open No. 61
- Groove 1 at the end of riser 5 of commutator piece 4 with dovetail part (0 engagement part) 8' disclosed in Publication No. 98139 etc.
In FIG. 7, the groove 10 is formed so that the end face is triangular, and in FIG. 8, the groove 10 is formed so that the cross section is arcuate.

Note that the dovetail portion 8' in FIGS. 7 and 8.

By improving the engagement between the commutator piece 4 and the insulating molded material 6c inside the commutator piece, it is possible to suppress the floating of the commutator piece 4 due to centrifugal force. It is not possible to sufficiently increase the bonding force with the material, and as mentioned above, it cannot be expected to sufficiently prevent the insulating molding material from falling out or peeling off near the riser section of high-speed rotating machines, or preventing the riser from floating.

Note that the groove portion 10 of the above embodiment may have any cross-sectional shape or directionality. In addition, instead of grooves, depressions or notches may be formed on the riser end face, or grooves may be formed.

Even if any combination of depressions, notches, etc. is formed on the riser end face, the same effects as in the above embodiments can be obtained.

Here, an example of the depression will be explained based on FIGS. 9 and 10. FIG. 9 shows a fourth embodiment of the present invention, and FIG. 10 is a partially enlarged side view of the state of a commutator intermediate product 4' during the commutator manufacturing process when viewed from the end surface side of the riser 5. FIG. -D sectional view. In these figures, the imaginary line indicated by reference numeral 9' indicates the formation location of the slot 9 which will be cut in a later step. Also.

Each commutator piece with a riser 9 is connected in series in the circumferential direction by a rib 10. In this embodiment, the end face of the riser 5 is dotted with circular depressions 11 to make the riser end face a non-smooth surface, and a mold is applied to each riser end face after the process of producing the intermediate product 4'. Then, molding is performed in the same manner as in the first embodiment. After the molding process, the slot 9 is formed by cutting along the two-dot chain line 9'.

In this case, if the recess 11 is aligned with the center of the slot cutting line 9', when pressing (caulking) the slot 9 after installing the coil, the part where the impact force of caulking is most applied (the part marked 9') will be Since the bond between the insulating molded material and the riser end face is strengthened, detachment of the insulating molded material 6d during press molding can be more effectively prevented.

Next, examples of notches will be explained based on the fifth embodiment shown in FIGS. 11 and 12.

FIGS. 11(a), (b), and (c) show a partially omitted left side view, a half-cut sectional view, and a partially omitted right side view of the intermediate product 4' of the commutator. teeth.

FIG. 22(a) already mentioned in the [Prior Art] section.

Corresponds to (b) and (c). Figure 12 is Figure 11(a)
It is an enlarged view of part E. The difference from the conventional example shown in Fig. 22 is that
A large number of notches 12 are formed on the end face of the riser 5. In the commutator molding process, the riser end face with the notches 12 is formed using an insulating molded material 6d (the first (see figure). This notch 1
2 may be formed in an arbitrary manner such as a radial or two circumferential shape in addition to an intersecting shape.

13 and 14 show a sixth embodiment of the present invention, and FIGS. 13(a), (b), and (c) are partially omitted left side views of a commutator intermediate product 4'; Half-cut sectional view.

A partially omitted right side view and FIG. 14 are an enlarged view of section F in FIG. 13(a). In this embodiment, instead of the riser end face, the opposing riser side faces 5b of the riser G2 have a cross section of V.
In the case of the sixth embodiment in which a plurality of letter-shaped depressions 13 are formed and the riser side surface 5b is a non-smooth surface, the same molding as in the other embodiments is performed after the molding process of the commutator intermediate product 4'. However, in this case, the insulating molded material near the riser 5 is filled into the slit G2 between the risers, and the end surface 5a of the riser 5 is covered with the insulating molded material. In this embodiment, the presence of the recess 13 increases the engagement force (bonding force) between the insulating molding material applied to the riser side surface 5b and the riser side surface, and furthermore, the insulating molding material coated on the riser end surface 5a integral with this increases The bonding strength of the material to the riser 5 also increases in a chain reaction.

Therefore, in the case of this embodiment as well, the mold commutator manufacturing process (slot processing) is carried out in the same manner as in each of the above-mentioned embodiments.

Even if an impact force is applied to the insulating molding material during slot caulking, etc., it prevents the insulating molding material from coming off between the risers or from the riser end face.Furthermore, when using a rotating electrical machine, the insulation molding material is prevented from separating from the riser side of the commutator piece Floating can be effectively prevented.

FIG. 15 shows a seventh embodiment of the present invention.

This is a modification of the sixth embodiment, in which the recess 13 formed in the riser side surface 5b is curved.

16 is a sectional view taken along the line GG in FIGS. 14 and 15.6 FIGS. 17 and 18 show the eighth embodiment of the present invention, and
The figure is a view of the riser of the commutator intermediate product 4' viewed from the outer periphery, and FIG. 18 is a view viewed from the H direction of FIG. 17. In this embodiment, a depression 14 is formed near the outer periphery of the riser side surface 5b, and this depression 14 is also filled with the insulating molded material 6b to prevent it from coming off.

〔Effect of the invention〕

As described above, according to the present invention, the bonding strength of the insulating molding material between the risers of the mold commutator and between the riser end faces, etc. is increased, so that the impact of impact during slot forming, caulking, and other operations such as transportation of the mold commutator is increased. Even if this occurs, it is possible to prevent the insulating molding material from coming off between the risers or from the end faces of the risers. Furthermore, it is possible to effectively prevent the rising of the riser side of the commutator pieces due to centrifugal force during operation, and thus the scattering of the commutator pieces, thereby improving the reliability of this type of molded commutator.

[Brief explanation of the drawing]

FIG. 1 is a half-cut sectional view of an armature for a rotating electric machine showing a first embodiment of the present invention, FIG. 2(a) is a left side view of a molded commutator of the first embodiment, and FIG. 2(b) is a 3 is a partially enlarged sectional view of FIG. 2(b), and FIG. 4 is a sectional view taken along line AA in FIG. 3. Figures 5(a) and 5(b) are waveform diagrams obtained by measuring the amount of unevenness of commutator pieces after rotation of a conventional molded commutator, and Figures 6(a) and (
b) is a waveform diagram obtained by measuring the amount of unevenness of the commutator piece after rotation of the molded commutator of the above embodiment, FIG. 7 is a partial cross-sectional view showing the second embodiment of the present invention, and FIG. 9 is a partial sectional view showing the third embodiment of the present invention, FIG. 9 is a partial side view showing the vicinity of the riser of a commutator intermediate product showing the fourth embodiment of the present invention, and FIG.
The figure is a sectional view taken along the line DD in FIG. 9, FIG. 11(a) is a partially omitted left side view of a commutator intermediate product showing the fifth embodiment of the present invention, and FIG. 11(b) is a half-section thereof. 11(c) is a partially omitted right side view, and FIG. 12 is E in FIG. 11(a).
FIG. 13(a) is a partially omitted left side view of a commutator intermediate product showing a sixth embodiment of the present invention, and FIG. 13(b) is a half-cut cross-section thereof. Figure, Figure 13 (
c) is a partially omitted right side view, and Fig. 14 is a partially omitted right side view, and Fig. 14 is a partially omitted right side view.
), FIG. 15 is a partially enlarged side view of a commutator intermediate product showing the seventh embodiment of the present invention, and FIG. 16 is an enlarged left side view of section F of FIG. 14 or FIG. GG sectional view, FIG. 17 is a partial plan view of a riser of an intermediate product of the commutator according to the eighth embodiment of the present invention, viewed from the outer circumferential direction, and FIG. 18 is a partial view seen from the H direction of FIG. 17. Figure 19 is a half-cut sectional view of a conventional armature for a rotating electric machine, Figure 20 (,) is a partially omitted side view of a conventional molded commutator seen from the riser side, and Figure 20 (b,) is its side view. 21 is a perspective view of a conventional commutator intermediate product; FIG. 22(a) is a partially omitted left side view of the commutator intermediate product shown in FIG. 21, viewed from the riser side; FIG. 22 (b) is a half-cut cross-sectional view, the second
FIG. 2(c) is a partially omitted right side view seen from the opposite side of the riser. DESCRIPTION OF SYMBOLS 1... Rotor shaft, 4... Commutator piece, 4'... Commutator intermediate product, 5... Riser, 5a... Riser end surface, 5 b =-- Riser side surface, 6 ( 6a, 6b,
6c, 6d)...Insulating molding material, 9...Slot, 1
0... Groove, 11... Hollow, 12... Notch, 1
3.14... depression, Gs... slit between commutator pieces, G2... slit between risers. Camellia 1 Kuko 3 Figure No. 1 Meb mouth Yogo concave Tachibana S mouth (ヱ) Me110 (27g Mo150 Ya (] Prisoner belt 190 Bleached Zo Ku (phantom Cb) ft2 + Shi 822 eyes) g (C)

Claims (1)

[Claims] 1. A plurality of commutator pieces each having a riser at one end are arranged in the circumferential direction, and an insulating molded material is provided between the commutator pieces, between the risers, and on the inner circumference of the commutator pieces. In a commutator formed by integrally filling and molding, the end face of the riser is provided with at least one type of non-smooth surface forming element such as a depression, a groove, a notch, etc. to make the riser end face a non-smooth surface. A molded commutator for a rotating electrical machine, characterized in that the riser end face with the non-smooth surface forming element is covered with the insulating molding material. 2. A plurality of commutator pieces each having a riser at one end are arranged in the circumferential direction, and an insulating molding material is integrally filled between the commutator pieces, between the risers, and the inner circumference of the commutator pieces, and molded. In the molded commutator, at least one type of non-smooth surface forming element such as a depression, a groove, a notch, etc. is provided on the opposing riser side surfaces between the risers to make the riser side surfaces non-smooth, A molded commutator for a rotating electrical machine, characterized in that the space between the riser side surfaces with the non-smooth surface forming elements is filled with the insulating molding material. 3. In the second aspect, the end face of the riser is provided with at least one type of non-smooth surface forming element such as a depression, a groove, a notch, etc. for making the riser end face a non-smooth surface, and the non-smooth surface is formed. A molded commutator for a rotating electric machine, in which a riser end face with an element is covered with the insulating molded material. 4. A process of forming a plurality of commutator pieces with risers from a conductive cylinder so that they are connected in a series in the circumferential direction via ribs, and forming the commutator pieces between these commutator pieces and between risers and the above-mentioned rectification. A step of integrally filling an insulating molding material with the inner peripheral part of the child piece and molding it, a step of forming slots for connecting the rotor coil in the riser after the molding, a step of removing the ribs, etc. In the method of manufacturing a molded commutator through the molding process, at least one type of depression, groove, notch, etc. is formed in advance on the end face of the riser to make the riser end face a non-smooth surface, and the riser end face is made into a non-smooth surface. A method for manufacturing a molded commutator for a rotating electric machine, wherein in the molding step, the riser end face, which has become a non-smooth surface, is molded while being covered with the insulating molding material. 5. A process of forming a plurality of commutator pieces with risers from a conductive cylindrical body in a state in which they are connected in a series in the circumferential direction via ribs, and forming between these commutator pieces and between risers and the above-mentioned. A step of integrally filling and molding an insulating molding material with the inner circumference of the commutator piece, a step of forming slots for rotor coil connection in the riser after the molding, and a step of removing the ribs. In the method of manufacturing a molded commutator through the above-mentioned molding process, at least one type of depression, groove, notch, etc. is formed in advance on the opposing side surfaces of the risers between the risers,
Mold rectification for a rotating electric machine, characterized in that the riser side surface is a non-smooth surface, and in the molding step, the insulating molding material is filled between the riser side surfaces that are non-smooth surfaces and molded. Method of producing children. 6. In the fifth aspect, in the step of making the riser side surface a non-smooth surface, at least one type of depression, groove, or notch is also formed on the riser end surface to make the riser end surface a non-smooth surface; A method of manufacturing a molded commutator for a rotating electric machine, which comprises covering a non-smooth riser end face with the insulating molding material and molding the same.