HK1081733B - Drum commutator for an electric machine and method for manufacturing and commutation system of the same - Google Patents

Description

Drum commutator for an electric machine, method for producing the same and commutation system

Technical Field

The invention relates to a commutator of a drum type for an electric machine, comprising a sleeve-shaped supporting body made of insulating plastic, a plurality of metallic conductor commutator segments arranged uniformly around the commutator axis on the supporting body and an annular interference suppression disc, wherein the metallic conductor commutator segments have terminal lugs arranged on the end faces thereof, and the interference suppression disc is electrically conductively connected with the conductor commutator segments in an end region located opposite to the terminal lugs. The invention also relates to a method for producing such a commutator and to a commutation system having such a commutator.

Background

Various designs are known for drum commutators, also known as cylindrical commutators. In which more and more drum commutators are equipped with spark suppression devices in order to prevent influences on electronic components located nearby. The interference suppression arrangement is designed in particular as a ring-shaped component made of a voltage-dependent resistance material, which is electrically conductively connected to the conductor commutator segments.

The arrangement of such ring members on a commutator of the drum type involves two different basic design options, namely a disturbance suppression ring which is arranged radially outside the brush contact surface (see, for example, US5895990A, US 5717270A, GB 2183933a and US 5796203a) and a disturbance suppression ring which is arranged radially inside the brush contact surface (see, for example, US 6285106B1 and DE19953231a 1). Special forms of interference-free commutator drum are also known, in which the conductor commutator segments are arranged outside the cylindrical interference-free component (see DE 2055648 and DE 3614869C 2). Finally, EP 364292B1 describes a drum commutator having a support body made of thermoplastic material, in which a heat-resistant reinforcing ring is arranged radially below the terminal lug, which reinforcing ring has an interference-reducing coating or can be arranged adjacent thereto a separate interference-reducing ring; in this case, the reinforcing ring, as well as optionally additionally provided separate interference suppression rings, is mounted on a support of the carrier, where it is fixed by clips projecting from the conductor commutator segments.

A commutator of the cartridge type with a disturbance-reducing ring arranged radially outside the brush contact surface has the disadvantage that it cannot be or must be produced automatically without suffering from impaired quality. Furthermore, for many practical applications, the use of a cartridge commutator with a disturbance suppression ring arranged radially inside the brush contact surface is only conceivable, since the space available for the respective commutator is limited.

A problem in such a commutator of the cartridge type with a noise-reducing ring arranged radially inside the brush contact surface arises from the different thermal expansion behavior of the noise-reducing ring, which is usually made of ceramic material, compared with the commutator concerned with the rest. That is, if special precautions are not taken, the corresponding thermal stresses can lead to premature commutator failure by cracking the interference canceling disk and/or breaking the connection of the conductor commutator segments to the interference canceling disk. In order to solve this problem, it is proposed in DE19953231a1 to connect the interference elimination disc to the support body with an elastic adhesive and to connect the conductor commutator segments to the interference elimination disc by means of thin wires which are soldered on the one hand to the terminal strips of the relevant conductor commutator segments and on the other hand to the metallization provided on the interference elimination disc. According to US 6285106B1, which discloses a commutator of the drum type, in contrast to this, leaf springs are used which are arranged in an annular cavity, which is bounded by a support body, a conductor commutator segment and an annular cover, for the electrical contacting of the conductor commutator segment with the interference suppression disk, and the interference suppression disk is also accommodated therein. This allows the interference suppression disk on the one hand and the remaining commutator segments on the other hand to have radially differently heat-insulated leaf springs, which can be fastened in particular to the annular cover.

The disadvantages of the two known, previously evaluated, drum-type commutators each having a disturbance-eliminating disk arranged radially inside the conductor commutator segments are mainly the high production costs, which are in particular the case of the commutator according to EP 364292B1, which are decisively attributable to the large number of components to be combined, in contrast to the competitive power of the corresponding drum-type commutator. Furthermore, in the case of the drum commutator according to EP 364292B1, it is a further disadvantage that the contact is not permanently reliable, which is based solely on the contact forces of the leaf springs on the conductor commutator segments and on the interference suppression disk, for example, because corrosion can destroy the contact.

Disclosure of Invention

It is therefore an object of the present invention to provide a long-life and reliable interference-free drum commutator of the type mentioned, which can be produced at low production costs, while at the same time it is particularly preferred to be able to produce an interference-free commutator which has substantially the same dimensions as a drum commutator of the same design parameters but which is not interference-free. It is a further object of the invention to provide a corresponding method of manufacturing such a cartridge commutator and a commutation system with such a cartridge commutator.

The invention is based on the object of providing a conductor commutator segment which has, in the end region which is located opposite the terminal, finger-shaped elastic contact tongues which are each connected directly and firmly to the interference suppression disc at a respective contact point remote from the pivot point, wherein the elastic contact tongues are each separated in the region between the pivot point and the contact point thereof relative to the adjacent component of the commutator such that the relative position of the contact tongues in this region relative to the adjacent component of the commutator can be changed by thermal expansion. A first feature of the commutator cartridge according to the invention is therefore that the contact tongues which are integral with the conductor commutator segments, i.e. are formed integrally with the other regions of the conductor commutator segments, are used for direct contact-connection of the conductor commutator segments with the interference suppression disk, so that, as in the prior art, separate, additional components, in particular in the form of wires and leaf springs, are provided for contact-connection of the conductor commutator segments with the interference suppression disk, which are not present in the commutator cartridge according to the invention. The direct contact of the contact tongues formed integrally on the conductor commutator segments with the interference suppression disc and at the same time without adverse effect on the service life of the commutator of the cartridge type can be achieved in that the contact tongues can be deformed in order to compensate for the different thermal expansion behavior of the interference suppression disc on the one hand and the remaining commutator components on the other hand. In addition, the deformability of the contact tongues results on the one hand from their elastic design, in which the contact points, at which the contact springs are directly and firmly connected to the interference suppression disk, are arranged at a distance from the contact tongue pivot, at which the contact tongues transition in a statically clamped manner into the adjacent region of the conductor commutator segment, and on the other hand from the separation of the contact tongues relative to the adjacent structural part, so that the adjacent structural part does not hinder a free expansion compensation. In particular, in the case of a drum commutator according to the invention, the elastic contact tongues are separated at their radially inner surface from the adjacent structural parts located radially inside the contact tongues in such a way that their distance from the structural part concerned can be changed by thermal expansion. By means of this separation of the elastic contact tongues from the radially inner adjacent structural parts of the commutator, the contact tongues can maintain a greater or lesser radial distance from the radially inner adjacent structural parts, depending on the particular thermal expansion of the respective structural part. Furthermore, due to the deformability of the contact tongues, the stresses acting in the fixed connection area of the contact tongues and the interference elimination disk are greatly reduced, thus eliminating the possibility of damaging this connection. The contact tongues can thus be permanently connected to the interference suppression disk, in particular by means of a simple soldered connection or also by means of an electrically conductive adhesive, in the region of the contact points.

Thus, by using the invention, an extremely inexpensive, long-lasting, compact and interference-free cartridge commutator can be produced, although the features of the cartridge commutator according to the invention are combined with the lowest production costs and the use of a minimum number of components.

A first preferred embodiment of the commutator of the invention is characterized in that the radial thickness of the spring contact tongues is smaller than the thickness of the conductor commutator segments. This is advantageous not only for the spring elasticity of the contact tongues already described above. Furthermore, it has proven to be particularly advantageous for the design of the contact tongues, as will be immediately apparent from the following description, to minimize the size of the interference-free commutator according to the invention.

The reduction of the thickness of the contact tongues relative to the conductor commutator segment is particularly preferably achieved in that the radially outer surfaces of the elastic contact tongues are offset inwardly relative to the brush contact surface. At the same time, it is particularly preferred that the width of the elastic contact tongue, measured in the circumferential direction, is smaller than the width of the conductor commutator segments; the conductor commutator segment has one or particularly preferably two axial projections adjacent to the contact tongues, which projections are still integral parts of the conductor commutator segment, the radially outer surfaces of the axial projections being in the region of the brush contact surface. In a commutation system comprising a commutator according to the invention, the brushes abutting the brush contact surfaces of the commutator can thereby be extended axially at least partially into the region in which the spring contact tongues are arranged, or in other words at least partially cover the contact tongues. By displacing the radially outer surface of the elastic contact tongues inwardly with respect to the brush contact surface, it is also possible for the contact tongues, which are deformed radially outwardly due to corresponding thermal stresses, not to come into conflict with the brush; the brushes thus also do not interfere with the deformation of the contact tongues caused by thermal stresses, although they overlap the contact tongues in order to minimize the size of the commutator. The axial projections of the conductor commutator segments arranged adjacent to the contact tongues increase the brush contact surface, which in turn facilitates the possibility of minimizing the dimensions of the commutator according to the invention, in particular in conformity with the dimensions of the undisturbed commutator having the same design parameters. The radial thickness of the axial projection of the conductor commutator segment is in particular greater here than the radial thickness of the spring contact tongue.

In a further preferred embodiment of the invention, the elastic contact tongues surround the interference suppression disc radially on the outside, the elastic contact tongues being spaced apart at their radially inner surface relative to the interference suppression disc or the outer jacket surrounding the interference suppression disc made of insulating plastic, in particular at a radial distance relative to these components. Such a design of the commutator according to the invention meets the extreme requirements with regard to the length of the short axial structure. In contrast, in the case of the commutator according to the invention, which is of particular importance, and in particular has a small diameter, according to a further preferred embodiment of the invention the interference disk has holes arranged around the commutator axis, through which the contact tongues extend. Here, the contact point of the elastic contact reed fixedly connected with the interference eliminating disc is arranged on the end surface of the interference eliminating disc facing to the outer side; and the size of these holes is larger than the cross section of the contact tongues by an amount such that the deformation of the elastic contact tongues to compensate for the thermal expansion difference is not hindered by the holes.

If, according to the first of the two further embodiments described above, the contact tongues surround the interference suppression disk radially on the outside, the elastic contact tongues are particularly preferably bent in the shape of a hook and bear against the outwardly facing end face of the interference suppression disk. In this connection, it is particularly preferred that the elastic contact tongues in the region of their hook-shaped curvature are held at a distance from the end-side outer edge of the interference suppression disc and from a jacket which may surround the interference suppression disc. The elastically curved contact tongue designed in this way facilitates compensation of possible stresses resulting from different thermal expansions of the individual components in the axial direction by corresponding deformations of the hook-shaped curved region of the contact tongue, and also facilitates compensation of possible machining tolerances. Alternatively or additionally, the axial end face of the interference suppression disk facing the inside can be held at a distance from the support body in order to prevent damage to the commutator by corresponding axial thermal stresses.

The contact-making of the above-described contact tongues on the end faces of the interference suppression disk facing outward is in no way mandatory here. Within the scope of the invention, it is conceivable to contact the contact tongues in the same manner on the circumferential surface of the interference suppression disk and on the outer edge of the end face of the interference suppression disk facing outward, i.e. in the transition region from the end face to the circumferential surface.

In a further preferred embodiment of the invention, in a cartridge commutator having a disturbance disk arranged radially inside the contact tongues, the disturbance disk is surrounded on its outer circumferential surface by an outer sleeve made of insulating plastic, wherein the elastic contact tongues are each separated at their radially inner surface from the outer sleeve, in particular are held at a radial distance from the outer sleeve. In a corresponding manner, a flange of insulating plastic is preferably provided which bears against the inner circumferential surface of the interference suppression disk. Embedding the interference suppression disc in insulating plastic in this way has proven to be particularly advantageous with regard to a long-term reliable operational suitability of the commutator, in particular because the possibility of abrasion of the electrically conductive material is reliably excluded, in particular because the abrasion of the brushes on the non-open surfaces of the interference suppression disc is suppressed. Furthermore, the outer sleeve in question and the flange in question have proven to be particularly advantageous when assembling a finished commutator on the rotor shaft of an electric machine in question, since the axial forces required for pressing the commutator against the shaft can be transmitted into the bearing body via the flange and/or the outer sleeve, so that the risk of damaging or even destroying the interference disk during the commutator assembly is considerably reduced.

Different de-disturbing discs may be used within the scope of the invention. It is particularly expedient in the present invention to use, without limitation, varistor disks and capacitor disks (so-called multilayer ceramic capacitors) as interference suppression disks for the commutator of the cartridge type according to the invention.

In a further preferred embodiment of the invention, the interference suppression disk has metallization regions on its two end faces, which are situated opposite one another and are each electrically conductively connected to one another in pairs by the metallization regions on the edge side. This design of the interference suppression disc is particularly advantageous for its intended function, since the interference suppression properties can be influenced positively thereby.

Preferably, the bearing body of the commutator of the invention has pocket-like recesses adjacent to the connecting points of the contact tongues and the conductor commutator segments. This is advantageous for the manufacture of the commutator. Furthermore, the axial length available for the deformation of the elastic contact tongue can be increased by the corresponding pocket, so that the elasticity of the contact tongue and thus the internal stresses are limited to a smaller extent.

The manufacture of the drum commutator according to the invention basically takes into account both possibilities of assembling the interference disk. One is to place the interference suppression disk on a composite comprising the support body and the conductor commutator segments or a conductor blank comprising all the conductor commutator segments and to solder or otherwise connect (for example, by conductive adhesive bonding) the interference suppression disk to the contact tongues, in particular if the interference suppression disk is arranged radially inside the contact tongues after the contact tongues have been bent into the hook shape; this means that the carrier is first injection-molded (injection-molded) onto the conductor blank, which may optionally also be carried out afterwards before the conductor blank is divided into individual conductor commutator segments, and then the interference disk is assembled and the contact is made. If necessary, a ring groove can be formed on the end face during the production of the support body, into which groove the interference-free disk is subsequently inserted. In the scope of the method, the interference-free disk can be mounted only after the commutator blank which is not processed to a certain extent is assembled on the rotor shaft; in this way, the manufacturer of the electric machine can be left with the option of selecting and assembling interference suppression disks according to the conditions in conjunction with the electric machine in which the commutator according to the invention is to be used. In a further particularly preferred method, the interference suppression disk is inserted into the conductor blank before the carrier is applied to the conductor blank and, if necessary, already contacted by the contact tongues; this method allows the interference suppression disc to be embedded in the plastic material used for the production of the support during the production of the support, in order to form the insulating plastic jacket and/or the insulating plastic flange already described above.

The manufacturing aspect of the spring contact tongues has two preferred manufacturing methods, depending in particular on the number of products to be produced. One of the reasons is that the conductor commutator segments can be sawn from the end face which is opposite the terminal lug, in particular each conductor commutator segment is preferably sawn twice, so that a resilient contact tongue is formed between the two saw cuts, while the axial projections which have already been described above are formed adjacent to the contact tongues and can axially extend the brush contact surface of the commutator concerned beyond the bearing points of the contact tongues. The reduced radial thickness of the future elastic contact tongues is suitably already formed during the production of the conductor blank, to be precise independently of whether it is wound from a strip-shaped material or produced from a sheet metal by deep drawing or from a tube section by stamping. In a commutator of the drum type which is produced in the manner of construction of the individual commutator segments, i.e. without using a one-piece conductor blank comprising conductor commutator segments which are all connected to one another via bridge sections, the reduced radial thickness of the future elastic contact tongues is suitably already formed when the commutator segment blanks are produced. The production method in which the spring contact tongues are sawn off at the end faces by the conductor commutator segments is preferred from the economic point of view, in particular with a low throughput. If, on the other hand, the drum commutator according to the invention is to be produced in large numbers, it has proven advantageous if the elastic contact tongues are produced by means of a shearing tool which, at the end faces of the conductor commutator segments which are located opposite the terminal segments, particularly preferably also shears the starting material twice in each case, in order to produce the contact tongues and the axial projections which have already been described above on both sides thereof by cutting a central strip out of the starting material. In this connection, it is particularly preferred to cut the elastic contact tongues out of the remaining material in two steps, for which purpose in a first step the contact tongues are first cut out radially outward from the remaining material of the conductor commutator segments until they project obliquely outward; then, if necessary after the interference disk has been placed, the contact tongues are pressed radially inward, to be precise beyond their original position, in a second step. The width of the punch to be used in both steps is selected such that such a division is formed between the resilient contact tongues and the axial projections adjacent to the conductor commutator segments, with a suitably narrow gap, so that the radially outward deflection movement of the resilient contact tongues, which is important for the invention, is not impeded. If hook-shaped bends are intended in any case at the contact tongue end, they can be shaped in particular in the second deformation step already described above. It should furthermore be noted that the two preferred methods of manufacturing the resilient contact tongues described above can be used independently of whether the interference elimination disc is embedded in a plastic substance (see above).

Drawings

The invention will be described in detail below with the aid of preferred embodiments shown in the drawings. Wherein:

fig. 1 shows an axial section through a first embodiment of a commutator of the invention;

FIG. 1a shows a partial enlargement of FIG. 1;

fig. 2 shows a perspective view of the drum commutator according to fig. 1;

fig. 3 shows an axial section through a second embodiment of a drum commutator according to the invention;

fig. 4 shows an axial section through a third embodiment of a drum commutator according to the invention;

fig. 5 shows an axial section through a fourth embodiment of a drum commutator according to the invention; and

fig. 6 shows a perspective view of an interference suppression disc in the form of a capacitor disc for producing the drum commutator according to fig. 5.

Detailed Description

The drum commutator shown in fig. 1 and 2 comprises, as essential structural parts, a support body 1 made of insulating plastic, ten conductor commutator segments 3 arranged uniformly about the commutator axis 2, and an annular ceramic interference suppression disc 4. The support body 1 has a bore 5 concentric with the axis 2 for mounting the commutator on a rotor shaft 6.

The anchoring portions 7 of the conductor commutator segments 3 are embedded in the plastic mass of the support body 1 in order to reliably anchor the conductor commutator segments even at high rotational speeds despite the centrifugal forces that occur. On the end side of the conductor commutator segments 3, terminal lugs 8 are provided, which are used in the known manner for connecting winding wires 9 to the commutator.

An elastic contact tongue 10 is formed on the conductor commutator segment on the end side where the conductor commutator segment and the lug 8 are opposed. Each conductor commutator segment 3 has two axial projections 11 on both sides of the contact tongue, wherein a narrow gap 12 is present between the contact tongue 10 and the adjacent axial projection 11, so that the contact tongue does not bear against the projections 11 in order to prevent a radial deflection movement thereof. The radial thickness of the contact tongue 10 is smaller than the radial thickness of the projection 11 and of the conductor commutator segment 3 in its region adjacent to the fulcrum 13 of the contact tongue 10. For this purpose, a radially outer and a radially inner step 14 or 15 are formed in the region of the fulcrum 13 of the contact tongue; in other words, the radially outer surface 16 of the resilient contact tongue 10 is offset inwardly with respect to the brush contact surface 17 and the radially outer surface of the axial projection 11 flush therewith. This allows the brush 18 to overlap the contact tongue 10 at least partially by the excess X in order to optimize the contact surface, so that the radially outer surface of the projection 11 adjacent to the contact tongue 10 is received in the brush contact surface.

The spring contact tongue 10 has a hook-shaped bend 19 at the end. The angle of the hook-shaped bend clearly exceeds 90 °, so that the contact tongue 10 rests on the end face 21 of the interference suppression disk 4 at the corresponding contact point 20. The soldered connection 22 ensures a permanent contact of the contact tongues 10 with the corresponding metallised regions 23 of the interference suppression disc 4.

The interference suppression disc 4 is embedded in the plastic mass of the carrier 1, to be precise on the one hand, to form an insulating plastic jacket 24 which surrounds the interference suppression disc 4 from the outside and on the other hand, to form an insulating plastic flange 25 which rests on the interference suppression disc 4 on the inside. The saw cuts 26, which divide the initially integral conductor blank into individual conductor commutator segments, extend, as shown in particular in fig. 2, into the jacket 24 in the region of the projections 11, so that only the end faces 21 of the interference plate 4 are open.

In connection with the step 15, which has already been described above at the pivot point 13 of the contact tongue 10 and is radially on the inside, an air gap 27 is present between the contact tongue 10 and the outer sleeve 24. Furthermore, the bending of the contact tongues 10 over 90 ° already described above results in an axial recess 28 of the contact tongues relative to the end face of the jacket 24 and the outer edge 29 of the end of the interference suppression disk 4. Both of these features are detailed features which have proven advantageous for the unhindered spring elasticity of the contact tongues 10 required for compensating radial expansion, wherein the axial recess 28 also facilitates compensation of expansion in the axial direction and tolerance compensation which is desired in terms of manufacturing technology.

The embodiment of the drum commutator according to the invention shown in fig. 3 corresponds in its essential design features to the embodiment according to fig. 1 and 2. The only decisive difference is the design of the contact tongue type. In the case of the drum commutator according to fig. 3, the contact tongues are only bent inward by far less than 90 ° and do not abut against the end face 21 of the interference suppression disk 4; rather, they are held at an axial distance from the end face 21 of the interference suppression disk 4, which axial distance is bridged by the solder bridges 30. It can be seen that even in this embodiment, for the reasons already explained above, the contact tongues 10 are of course each held at a (radial) distance from the radially outer surface of the outer sleeve 24 and at an (axial) distance from the axial end face of the outer sleeve 24.

The cartridge commutator shown in fig. 4 differs from the cartridge commutator according to fig. 1 and 2 primarily in that the interference suppression disk 4 is not embedded in the plastic material of the carrier 1, but is arranged on the end face on the carrier 1 and, on the one hand, in the region of the inner annular region 31 and, on the other hand, in the region of the radial crosspiece 32. Here, the radial rungs 32 are respectively provided between two conductor commutator segments 3 adjacent to each other; and each crosspiece 32 separates two pocket-like recesses 33 from each other, the recesses 33 being provided respectively at the end side of the support body 1 adjacent to the fulcrums 13 of the contact tongues 10.

The fourth embodiment of the cartridge commutator according to the invention shown in fig. 5 corresponds in terms of its essential design features to the cartridge commutator according to fig. 1 to 4 already described above. In this case, however, the interference suppression disk 4 is not designed as a varistor disk, but as a capacitor disk in the form of a so-called multilayer ceramic capacitor. As shown in fig. 6, the disk does not have a circular outer circumferential surface; specifically, radial projections 34 are present, the number of which corresponds to the number of conductor commutator segments, and a metallised zone 35 is provided on the circumferential surface thereof, which extends into the adjacent region of the two end faces. In the region of each radial projection 34, the spring contact tongues 10 are connected to the interference suppression disk 4, wherein the contact points 20 are in the region of the outwardly facing outer edge 29 of the interference suppression disk 4.

In the case of the drum commutator according to fig. 5 and 6, the jacket 24 surrounding the interference suppression disk 4 extends only over a part of its axial thickness in the contact-making aspect of the interference suppression disk already described above. No internally located flange of insulating plastic is provided at all.

Furthermore, it can be seen that in the region of the pivot 13 of the contact tongue 10, a step is provided in relation to the adjacent region of the associated conductor commutator segment 3, which step is much smaller than in the case of the drum commutator already described above, so that the contact tongue 10, despite its separation from the outer jacket 24, rests against the latter next to the pivot 13.

Claims (36)

1. A commutator of the drum type of an electric machine, comprising a sleeve-like supporting body (1) made of insulating plastic, a plurality of metallic conductor commutator segments (3) arranged uniformly on the supporting body around a commutator axis (2), and an annular interference suppression disc (4), wherein the metallic conductor commutator segments (3) have terminal lugs (8) arranged on the end faces thereof, and the interference suppression disc (4) is conductively connected to the conductor commutator segments (3) in an end region located opposite to the terminal lugs (8), characterized in that: the conductor commutator segment (3) has finger-shaped elastic contact tongues (10) in the end region which is located opposite the terminal strip (8), which are each connected directly and firmly to the interference suppression disc (4) at corresponding contact points (20) away from the pivot point (13) thereof, wherein the elastic contact tongues (10) are each separated in the region between the pivot point (13) and the contact point (20) thereof relative to the adjacent commutator component of the commutator such that the relative position of the contact tongues (10) in this region relative to the adjacent commutator component of the commutator can be changed by thermal expansion.

2. A cartridge commutator as defined in claim 1, in which: the radial thickness of the elastic contact tongue (10) is smaller than the radial thickness of the conductor commutator segment (3) between the fulcrum (13) of the contact tongue (10) and the lug plate (8).

3. A cartridge commutator as defined in claim 2, in which: the radial dimension of the elastic contact tongue (10) does not exceed the radial dimension of the conductor commutator segment (3) between the fulcrum (13) of the contact tongue (10) and the lug (8).

4. A cartridge commutator as defined in claim 3, in which: the radially outer surface (16) of the spring contact tongue (10) is offset inwardly with respect to the radially outer surface of the conductor commutator segment (3), i.e. the brush contact surface (17).

5. A cartridge commutator as defined in any one of claims 1 to 4, wherein: the width of the elastic contact tongue (10) measured along the circumferential direction is smaller than the width of the conductor commutator segment (3) measured along the circumferential direction.

6. A cartridge commutator as defined in claim 5, in which: the conductor commutator segment (3) has an axial projection (11) adjacent to the contact tongue (10), the radial thickness of the axial projection (11) is greater than the radial thickness of the contact tongue (10), and the radial outer surface of the axial projection (11) is located in the extension of the radial outer surface of the conductor commutator segment (3), i.e. the brush contact surface (17).

7. A cartridge commutator as defined in any one of claims 1 to 4, wherein: the contact tongues (10) surround the interference suppression disk (4) radially on the outside.

8. A cartridge commutator as defined in claim 7, in which: the end of the spring contact tongue (10) is bent inwards in the shape of a hook, and the contact point (20) is arranged on the outward-facing end face (21) of the interference suppression disk (4).

9. A cartridge commutator as defined in claim 8, in which: the resilient contact tongues (10) are spaced apart in the area of their hook-shaped curvature from the radially outer edges (29) of the outwardly facing end faces of the interference suppression disc (4).

10. A cartridge commutator as defined in claim 7, in which: the elastic contact tongues (10) are angled inwards, and the contact points (20) are arranged on the radially outer edges (29) of the outwardly facing end faces of the interference suppression disc (4).

11. A cartridge commutator as defined in claim 7, in which: the contact points are arranged on the radial outer circumferential surface of the interference elimination disc (4).

12. A cartridge commutator as defined in any one of claims 1 to 4, wherein: the interference suppression disc has holes arranged around the commutator axis (2) through which contact tongues (10) extend.

13. A cartridge commutator as defined in any one of claims 1 to 4, wherein: the interference suppression disc (4) is surrounded on its outer circumferential surface by a jacket (24) made of insulating plastic at least along a part of its axial thickness.

14. A cartridge commutator as defined in any one of claims 1 to 4, wherein: a flange (25) of the supporting body (1) made of insulating plastic is provided, which is in contact with the inner circumferential surface of the interference-free disc (4).

15. A cartridge commutator as defined in any one of claims 1 to 4, wherein: the contact tongue (10) is soldered to the interference suppression disc (4) in the region of the contact point (20).

16. A cartridge commutator as defined in any one of claims 1 to 4, wherein: the contact tongue (10) is conductively bonded to the interference suppression disc (4) in the region of the contact point (20).

17. A cartridge commutator as defined in any one of claims 1 to 4, wherein: the interference suppression discs (4) have metallization regions (23) on their two end faces, which are located opposite one another and are each electrically conductively connected to one another in pairs by metallization regions on the edge side of the interference suppression discs (4).

18. A cartridge commutator as defined in any one of claims 1 to 4, wherein: the axial end face of the interference suppression disc (4) facing the inside is kept at a distance from the support body (1).

19. A cartridge commutator as defined in any one of claims 1 to 4, wherein: the support body (1) has pocket-like recesses (33) adjacent to the pivot points (13) of the contact tongues (10).

20. A commutation system comprising a commutator of the cartridge type according to claim 1 and at least two brushes (18) abutting against brush contact surfaces (17) of the conductor segments (3), wherein the brushes (18) project axially beyond the fulcrums (13) of the contact tongues (10).

21. A method for producing a commutator of the drum type according to claim 1, wherein the support body (1) is first injection-molded on a conductor blank comprising all initially interconnected conductor commutator segments (3), which conductor blank is subdivided into individual conductor commutator segments (3) insulated from one another in a subsequent method step by means of cut-out openings (26), wherein a interference suppression disc (4) is placed on the composite part comprising the support body (1) and the conductor blank, and the interference suppression disc (4) is connected to the contact tongues (10).

22. The method of claim 21, wherein: a ring groove is formed during the injection molding of the support body (1), after which the interference suppression disk (4) is inserted into the ring groove.

23. A method as claimed in claim 21 or 22, wherein: in order to produce the spring contact tongues (10), the conductor commutator segments (3) are sawn twice from the end face which is opposite to the terminal strip (8), so that a spring contact tongue (10) is formed between two adjacent saw cuts, and an axial projection (11) is formed adjacent to the contact tongue (10).

24. A method as claimed in claim 21 or 22, wherein: in order to produce the elastic contact tongues (10), each conductor commutator segment (3) is cut in two axial planes from the end face which is opposite to the terminal lug (8) in order to produce the contact tongues (10) and the axial projections (11) on both sides next to the contact tongues by cutting a narrow strip in the center out of the raw material of the conductor blank.

25. A method according to claim 24, characterized in that said resilient contact tongue (10) is made in two steps from the material left after shearing of said conductor commutator segments (3) in two axial planes, for which purpose said contact tongue (10) is first sheared radially outwards from the material left by the conductor commutator segments (3) in a first step, and then the contact tongue (10) is bent radially inwards in a second step.

26. The method of claim 25, wherein: the end faces of the contact tongues (10) are bent inward or bent into a hook-like shape in a second step.

27. The method of claim 25, wherein: the support body (1) is formed on the conductor blank between a first and a second step of forming a contact tongue (10) from the raw material left after the conductor commutator segments (3) are sheared in two axial planes.

28. The method of claim 25, wherein: the interference suppression disc (4) is positioned on the conductor blank between a first and a second step of producing a contact tongue (10) from the raw material left after the conductor commutator segments (3) have been sheared in two axial planes.

29. The method of claim 27, wherein: between a first and a second step of making contact tongues (10) from the raw material left after the conductor commutator segments (3) have been sheared in two axial planes, the interference suppression disc (4) is positioned on the support body (1) which has been formed on the conductor blank.

30. A method of manufacturing a drum commutator according to claim 1, wherein the support body (1) is first injection molded on a conductor blank comprising all initially interconnected conductor commutator segments (3), the conductor blank is subdivided into individual conductor commutator segments (3) insulated from one another in a subsequent method step by cutting openings (26), wherein the interference suppression disk (4) is embedded in the conductor blank before the support body (1) is injection molded on the conductor blank, and when the support body (1) is manufactured, in the case of a radially relatively outer jacket (24) made of insulating plastic and/or a radially relatively inner flange (25) made of insulating plastic, the interference-free disc (4) is embedded in an insulating plastic material used for the production of the carrier.

31. The method of claim 30, wherein: in order to produce the spring contact tongues (10), the conductor commutator segments (3) are sawn twice from the end face which is opposite to the terminal strip (8), so that a spring contact tongue (10) is formed between two adjacent saw cuts, and an axial projection (11) is formed adjacent to the contact tongue (10).

32. The method of claim 30, wherein: in order to produce the elastic contact tongues (10), each conductor commutator segment (3) is cut in two axial planes from the end face which is opposite to the terminal lug (8) in order to produce the contact tongues (10) and the axial projections (11) on both sides next to the contact tongues by cutting a narrow strip in the center out of the raw material of the conductor blank.

33. A method according to claim 32, characterized in that said resilient contact tongue (10) is made in two steps from the material left after shearing of said conductor commutator segments (3) in two axial planes, for which purpose said contact tongue (10) is first sheared radially outwards from the material left by the conductor commutator segments (3) in a first step, and then the contact tongue (10) is bent radially inwards in a second step.

34. The method of claim 33, wherein: the end faces of the contact tongues (10) are bent inward or bent into a hook-like shape in a second step.

35. A method as claimed in claim 33 or 34, wherein: the support body (1) is formed on the conductor blank between a first and a second step of forming a contact tongue (10) from the raw material left after the conductor commutator segments (3) are sheared in two axial planes.

36. A method as claimed in claim 33 or 34, wherein: the interference suppression disc (4) is positioned on the conductor blank between a first and a second step of producing a contact tongue (10) from the raw material left after the conductor commutator segments (3) have been sheared in two axial planes.