DE102019131995A1 - Pick-up and rotating unit, wire end forming device provided with it, as well as wire end forming process - Google Patents

Abstract

The invention relates to a receiving and rotating unit (32a) for use in the manufacture of a component of an electrical machine provided with coils, comprising an annular region (45) with an annular arrangement (46) of receptacles (48a, 48b) for wire ends protruding from the component (12a, 12b). The wire ends (12a, 12b) are pushed into the receptacles (48a, 48b) by the relative movement of the receiving and rotating unit (32a) and the housing (14) and are bent in the circumferential direction. A first group of first receptacles (48a) for a first type of wire ends (12a) and at least one second receptacle (48b) for at least one wire end (12b) of a second type are mutually circumferential by a circumferential offset b unequal to the distance between the first receptacles ( 48b) offset from one another. The at least one second receptacle (48b) has an insertion funnel (54) with a guide wall (56) on one side, which extends axially and radially and over at least the distance b in the circumferential direction obliquely and / or curved. A wire end forming apparatus and a wire end forming method using such a receiving and rotating unit (32a) will also be described.

Description

The invention relates to a receiving and rotating unit for use in the production of a component of an electrical machine provided with coils for receiving and rotating wire ends protruding from an annular housing of the component for the purpose of bending the wire ends in the circumferential direction. The invention also relates to a wire end shaping device provided therewith. Finally, the invention relates to a wire end shaping method for shaping wire ends protruding from an annular housing in the course of manufacturing a component of an electrical machine provided with coils.

• [1] US 6,519,993 B2
• [2] US 8,215,000 B2
• [3] WO 2012/093413 A1
• [4] DE 10 2014 208 082 A1
• [5] DE 10 2014 206 105 B4
• [6] WO 2018/233774 A1
• [7] WO 2018/233771 A1
• [8] DE 10 2018 103 929 A1
• [9] WO 2019/161846 A1
• [10] DE 10 2018 103 927 A1
• [11] WO 2019/161832A1

With regard to the technological background, reference is made in particular to the following literature:

• [1] US 6,519,993 B2
• [2] US 8,215,000 B2
• [3] WO 2012/093413 A1
• [4] DE 10 2014 208 082 A1
• [5] DE 10 2014 206 105 B4
• [6] WO 2018/233774 A1
• [7] WO 2018/233771 A1
• [8th] DE 10 2018 103 929 A1
• [9] WO 2019/161846 A1
• [10] DE 10 2018 103 927 A1
• [11] WO 2019 / 161832A1

Electrical machines are understood to mean, in particular, machines for converting electrical energy into kinetic energy and machines for converting kinetic energy into electrical energy. In particular, this should be understood as meaning electric motors and generators.

In the manufacture of machine elements of such electrical machines, such as stators or rotors, it is often necessary to connect ends of conductors formed from wires to one another or to process them in some other way, such as cutting or shaping them together.

For example there is - see e.g. B. [6] and [7] - electric motors in which coil windings, in particular of the stator, are formed from different pieces of wire, the ends of which are then connected to one another. Devices and methods for connecting wire ends of so-called hairpins - essentially U-shaped bent wires - for forming stator windings of electrical machines, in which the wire ends are welded together, have already been proposed. Devices and methods for positioning and tensioning the wire ends before welding are provided.

In order to be able to weld the wire ends correctly, it is advantageous to first reshape the wire ends (also called pins) protruding from the individual grooves of the component housing, for example after inserting hairpins or the like, in particular to widen and cross them, for example, to form pairs of wire ends that are to be connected to one another.

In the manufacture of hairpin stators, the pin ends are twisted around a defined angle in the circumferential direction during the setting process using mounting and rotating units (so-called "setting"). Usually, all pin ends that are on the same radius are twisted by the same angle; radially adjacent pins are twisted in opposite directions.

For example, to enable phase connections, for example by connecting wiring elements, it can be advantageous to use pin ends (special hairpins, also known as “special hairpins”, which in many cases have one or two longer free-standing wire ends than the “standard hairpins” “) With the same radius in the same direction, but to restrict to different target angles.

Wire end shaping devices with receiving and rotating units for deforming wire ends protruding from a housing of a component of an electrical machine in the circumferential direction are known, for example, from [1], [2], [3] and [4]. In the prior art, when control pins and special pins are to be interlaced, complex tools and / or complex setting processes are used.

For example, a so-called "lost motion member" is used in [2], which enables defined pins to be interlaced by a smaller angle. A setting tool is used for this, which has a ring segment which is movably connected to the main structure of the tool. The ring segment can be rotated through a defined angle (around the same axis around which the setting tool rotates in the process) and is pressed into a basic position with springs. At the beginning of the setting process, the main structure rotates up to a predefined angle relative to the ring segment. The remaining angle rotate the ring segment and the main structure together; this creates a "lost motion" between the pin ends located on the ring segment and the pin ends positioned on the main structure. With this mechanism, pin ends that are positioned on the same radius can open different target angles can be set. However, a complex, multi-part tool is required.

A multi-part tool is also used for [3]. The tool also includes a ring segment that can only be moved in the axial direction relative to the main structure. In this process, the pin ends in the main structure are set by a partial angle at the beginning of the process. In the next step, a ring segment is fed axially, which receives the previously unmachined pin ends with pockets. The remaining angle rotate the ring segment and the main structure together. A complex, multi-part tool is also provided here.

In a device known from [4], axially adjustable segments are also used. The difference to the device of [3] is that the segments always rotate together; for the last part of the set angle, the segments are retracted axially in order to enable the defined pin ends to run freely ("lost motion").

In [4] a bending device is described with which "with the same final bending angle to the cross-sectional plane of the winding carrier but with different bending lengths" can be performed.

Examples for the production of a component of an electrical machine provided with coils are known from [6] and [7], an annular housing of the component being provided with protruding wire ends. For this purpose, hairpins are inserted into an annular housing of a stator formed from a laminated core.

The object of the invention is to provide simplified units, devices and methods with which different groups of wire ends can be interlaced more reliably in the circumferential direction in the same direction, but at a different angle.

To achieve this object, the invention creates a receiving and rotating unit according to claim 1. A wire end shaping device provided therewith and a wire end shaping method are the subject of the dependent claims. Advantageous refinements are the subject of the subclaims.

According to a first aspect thereof, the invention provides a receiving and rotating unit for use in the manufacture of a component provided with coils of an electrical machine for receiving and rotating wire ends protruding from an annular housing of the component for the purpose of bending the wire ends in the circumferential direction
a ring area with an annular arrangement of receptacles for wire ends, which are designed such that the wire ends by relative movement of the receiving and rotating unit and housing in the axial direction
Direction can be pushed into the receptacles and can be bent in the circumferential direction by relative rotation of the receiving and rotating unit relative to the housing,
the arrangement of receptacles having a first group of first receptacles for a first type of wire ends and at least one second receptacle for at least one wire end of a second type, the first receptacles having a defined circumferential spacing relative to one another of n ₁ × a, the at least one second recording is offset in the circumferential direction by a circumferential offset b unequal nxa to a circumferential position corresponding to a first recording, which is _{spaced from the first recording with the defined circumferential distance n 1} × _a , where a and b are constant _{path dimensions in the circumferential direction and n 1} and n Natural numbers are greater than zero and wherein the at least one second receptacle has an introduction funnel with a guide wall on one side, which extends axially and radially and over at least the distance b in the circumferential direction obliquely and / or curved.

A first group of wire ends of the first type and at least one further wire end of the second type can thus be interlaced on the same radius in the circumferential direction in the same direction, but at a different angle.

A preferred embodiment of the receiving and rotating unit comprises a second group of second receptacles for several wire ends of the second type, the second receptacles having a defined circumferential spacing relative to one another of n ₂ × a, where n _{2 is} a natural number greater than zero, the The first group and the second group are circumferentially offset from one another by the circumferential offset b, and each second receptacle has the insertion funnel with the guide wall running obliquely and / or curved in the axial direction and over at least the distance b in the circumferential direction.

In this way, a first and a second group of wire ends can be interlaced on the same radius in the circumferential direction in the same direction, but at a different angle with a simple procedure.

In embodiments of the invention it can be provided that, in addition, a third group of wire ends can also be interlaced by a further different angle. The first group of wire ends can be, for example, control pins, the second group of wire ends can, for example, be special pins, for example for connecting wiring elements to a winding formed from the wires.

In some embodiments of the invention, not only are a first type of wire ends (such as control pins) and a second type of wire ends (such as special pins) used, but different groups of special pins can also be used, for example two different types of special pins can be used. Accordingly, the receiving and rotating unit can also have further groups of receptacles for other types of wire ends.

It is preferred that the introduction funnel of the at least one second receptacle has the obliquely running guide wall on a first side and has an arcuately curved course on the opposite second side.

It is preferred that the guide wall of the insertion funnel of the at least one second receptacle is designed to hold the associated wire end of the second type during the axial relative movement of the receptacle and rotating unit and housing, which is used to introduce the wire ends protruding from the housing of essentially the same length of the first and second type is to be carried out, bend in the circumferential direction in such a way that the at least one wire end of the second type is offset relative to wire ends of the first type in the circumferential direction by the distance b.

It is preferred that b is a value from 0.001 × a to 0.999 × a.

It is preferable that b is a value from 0.3 × a to 0.7 × a.

It is preferred that b be 0.5 × a.

It is preferred that for a: a = U / n ₃ , where U is the total circumference of the ring area and n _{3 is} a natural number greater than 1, in particular greater than 20. In particular, the number of housing grooves in the housing to be machined is selected for n _3. a then corresponds to the slot pitch.

It is preferred that the receptacles are designed as grooves or pockets.

It is preferred that the receiving and rotating unit is designed as a setting crown.

It is preferred that the first and second receptacles have the same radial distance from an axis of rotation of the receiving and rotating unit.

It is preferred that the ring area is formed in one piece.

It is preferred that the receiving and rotating unit is designed in one piece.

According to a further aspect, the invention provides a wire end shaping device for use in the production of a component provided with coils of an electrical machine, for shaping wire ends protruding from an annular housing of the component, comprising a bending device for bending wire ends in a circumferential direction, a relative movement device for relative movement Moving the housing and the bending device in an axial direction and a control unit, the bending device having at least one receiving and rotating unit according to one of the preceding configurations and a rotary drive for relative rotation between the receiving and rotating unit and the housing, the control being designed to perform a relative movement of the housing and the bending device in the axial direction until the at least one wire end of the second type is bent in the circumferential direction by the guide wall for displacement in the circumferential direction in the at least one second receptacle is inserted and the wire ends of the first type are inserted into the first receptacles, and then a relative rotation between the receiving and rotating unit and the housing to perform with the wire ends inserted into the receptacles in order to insert the wire ends of the first type and the at least one to it To bend circumferentially offset wire ends of the second type in the circumferential direction.

It is preferred that the surface of the guide wall which contacts the second wire end faces in the direction opposite to the direction of rotation of the relative rotation.

1. a) Bereitstellen einer Aufnahme- und Dreheinheit, die einen Ringbereich mit einer ringförmigen Anordnung von Aufnahmen für die Drahtenden umfasst, wobei die Anordnung von Aufnahmen eine erste Gruppe von ersten Aufnahmen für einen ersten Typ Drahtenden und wenigstens eine zweite Aufnahme für wenigstens ein Drahtende eines zweiten Typs aufweist, wobei die zweite Aufnahme einen Einführungstrichter mit einer Führungswand an einer Seite aufweist, die sich axial und radial und über wenigstens ein Streckenmaß b in Umfangsrichtung schräg und/oder gekrümmt verlaufend erstreckt,
2. b) relatives Bewegen von Gehäuse und Aufnahme- und Dreheinheit in axialer Richtung, bis das wenigstens eine Drahtende des zweiten Typs, unter Führung durch die Führungswand in Umfangsrichtung verbogen wird und wenigstens um das Streckmaß b in Umfangsrichtung gegenüber ihrer ursprünglichen Umfangsposition versetzt in die wenigstens eine zweite Aufnahme eingeführt ist und die Drahtenden des ersten Typs in die ersten Aufnahmen eingeführt sind, und
3. c) relatives Drehen von Aufnahme- und Dreheinheit und Gehäuse mit den in die Aufnahmen eingeführten Drahtenden, um die Drahtenden des ersten und des zweiten Typs in Umfangsrichtung umzuformen.

According to a further aspect, the invention provides a wire end forming method for forming wire ends protruding from an annular housing in the course of the production of a component of an electrical machine provided with coils, comprising:

1. a) Providing a receiving and rotating unit comprising a ring area with an annular arrangement of receptacles for the wire ends, the arrangement of receptacles having a first group of first receptacles for a first type of wire ends and at least one second receptacle for at least one wire end of a second Type, the second receptacle having an insertion funnel with a guide wall on one side which extends axially and radially and over at least one distance b in the circumferential direction obliquely and / or curved,
2. b) relative movement of the housing and the receiving and rotating unit in the axial direction until the at least one wire end of the second type is bent in the circumferential direction under guidance by the guide wall and offset in the at least one direction by at least the stretching dimension b in the circumferential direction compared to its original circumferential position second receptacle is inserted and the wire ends of the first type are inserted into the first receptacles, and
3. c) relative rotation of the receiving and rotating unit and the housing with the wire ends inserted into the receptacles in order to reshape the wire ends of the first and the second type in the circumferential direction.

It is preferred that step a) comprises providing a receiving and rotating unit according to one of the preceding configurations and / or that the method is carried out with a wire end shaping device according to one of the preceding configurations.

It is preferred that in step a) the receiving and rotating unit is provided in such a way that for a: a = U / n ₃ , where U is the total circumference of the ring area and n _{3 is} the number of housing grooves of the housing from which the wire ends protrude.

It is preferred that the direction of rotation in step c) is opposite to the direction of bending and displacement of the at least one wire end of the second type from step b).

Embodiments of the invention create devices and methods that are used to produce a winding of an electrical machine and, in particular, enable hairpins or the like to be entangled with a lost motion.

Refinements of the invention relate in particular to a tool concept for the production of different setting angles within a setting ring.

Embodiments of the invention are preferably used in a manufacturing process of a component of an electrical machine using individual wires to be bent, in particular in the form of hairpins or I-pins. For example, the component is a stator of an electrical machine. For example, the manufacturing process of a hairpin stator, in which the embodiments of the invention are used, comprises a large number of forming and non-forming manufacturing steps. One of the forming production steps is, for example, the interlocking of the hairpin ends protruding from a stator core. When setting, for example, the hairpin ends are bent in the circumferential direction of the laminated stator core with the help of setting tools ("setting crowns") in such a way that certain wire ends lie together and can be contacted in a subsequent process. The required end position of the wire ends after setting depends on the underlying winding scheme of the stator.

The arrangement of the non-set hairpin wire ends in the stator core is usually distributed regularly over the diameter. Correspondingly, in previous solutions, the recesses in the setting tool, which receives each wire, are also regularly distributed over the diameter and cannot be displaced with respect to one another. In contrast to this, the above-described arrangements of first receptacles and one or more second receptacles are provided in embodiments of the invention.

The wire ends are entangled in a ring. This means that all wire ends lying on the same diameter are formed or set in one forming step by the same path in the circumferential direction of the laminated stator core. In previous solutions, after the setting process, the wire ends assume positions that are again regularly distributed over the diameter. The set angle is therefore identical for all wires in previous solutions.

However, depending on the design of the stator winding scheme, it may be necessary to implement different set angles within a ring. This case cannot be covered by the current state of the art or can only be covered with great expenditure in terms of apparatus and process technology.

A solution with less equipment and process engineering effort is in the not previously published German patent application 10 2019 116 235.1 described and shown, to which express reference is made for further details. Here, through an irregular arrangement of the cutouts in the tool and a changed process sequence, irregular end positions of the wire ends of the second type, ie for example special pins, of a component, for example a stator, are achieved. The prerequisite for this is that the wire ends of the second type, e.g. special pins, protrude significantly longer over the component, e.g. the laminated core edge of the stator, than the wire ends Wire ends of the first type, such as the regular pins, because the wire ends of the second type are first threaded into the tool, then the tool is turned against the setting direction, and only then can the wire ends of the first type be threaded. Accordingly, this method is limited to those units in which the wire ends of the second type, such as special pins, are longer than the wire ends of the first type, such as the regular pins. Therefore, with this previously proposed technology, only a part of those components, for example stators, can be produced which have different set angles within a ring.

Depending on the component design, such as the stator design in particular, it may be necessary to implement different set angles within a ring with wire ends or pins of the same length. In this case, the wire ends / pins concerned should deviate from their regular position after the setting process. In order to keep the process engineering effort low, however, only a one-piece setting tool should be available, which is rotated by a certain distance. This can be achieved with embodiments of the invention.

In the setting process, wire ends or pin ends that are located on the same radius can be set in the same direction, but at different (target) angles. The pin ends are preferably machined with a tool in which pockets (of the setting tool) are located on the same radius in order to avoid potential damage to the installation space and to achieve a qualitatively better setting result.

To avoid the disadvantages of the prior art, preferred embodiments of the invention create a one-piece tool which, preferably in conjunction with a special sequence, enables the “lost motion” of defined pins.

The tool preferably has “special slots” which are offset from “standard slots” by an angle (preferably half the slot angle).

Refinements of the invention provide a setting tool concept which enables different setting angles to be implemented within a setting ring, with the wire ends of the first type and of the second type, e.g. regular and irregular pins, not having to have different lengths.

When bending wire ends protruding from the component in the circumferential direction, the tool made available by embodiments of the invention fulfills the requirement that individual straight wire ends regularly distributed over the stator diameter can deviate from their regular position after the setting process. The tool is preferably also formed from one part and not from elements that can be displaced relative to one another.

In preferred embodiments of the invention, the contour of the tool - ie here the receiving and rotating unit - is adapted in such a way that the wires that are to deviate from their regular position are shifted by a first distance x against the setting direction as they enter the tool . In the subsequent setting process, all wires are reshaped by a second distance y. By preforming, the end position of the wires, which should deviate from their regular position, can be influenced in such a way that precisely these wires are shifted by the first distance x (opposite to the twisting direction). In addition, a difference in length between regular and irregular pins is not necessary (although possible).

An advantage of embodiments of the invention compared to the prior art is that irregular wire positions can be implemented during the setting process with only one one-piece tool per setting ring. One tool is not required for each special item, which means considerable cost savings.

In addition, the configurations of the invention differ from those in the German patent application DE 10 2019 116 235.1 Embodiments described, pins with a regular length are also restricted to special positions. This allows a wider range of stator designs (or other components) to be covered. The general process sequence also remains unchanged from previous manufacturing processes, since no intermediate step is necessary after threading the special pins (as in the designs of the German patent application DE 10 2019 116 235.1 ). As a result, there is no need to accept an increase in the cycle time.

• 1 eine schematische Blockdarstellung eines Ausführungsbeispiels einer Drahtendenumformvorrichtung;
• 2 eine perspektivische Ansicht eines Ausführungsbeispiels für eine in der Drahtendenumformvorrichtung zu verwendende Biegevorrichtung, die eine konzentrische Anordnung mehrerer Aufnahme- und Dreheinrichtungen und Antriebseinrichtungen für jede der Aufnahme- und Dreheinrichtungen aufweist;
• 3 einen Schnitt durch die konzentrische Anordnung von Aufnahme- und Dreheinrichtungen der Biegevorrichtung von 2;
• 4 eine perspektivische Ansicht einer inneren Aufnahme- und Dreheinheit der Anordnung von 3;
• 5 einen Schnitt durch eine äußere Aufnahme- und Dreheinheit der Anordnung von 3;
• 6 zu Erläuterungszwecken eine perspektivische Darstellung des oberen Bereichs einer Aufnahme- und Dreheinheit von 5 gemäß einem anderen Lösungsansatz;
• 7 eine Seitenansicht auf den oberen Rand der inneren Aufnahme- und Dreheinheit von 3 bei einem ersten Schritt eines Drahtendenumformverfahrens, bei dem nur Drahtenden eines ersten Typs, hier zum Beispiel regelmäßige Pins, welche aus einem Bauteil vorstehen, in Umfangsrichtung umzubiegen und somit zu schränken sind;
• 8 eine Ansicht wie in 7 bei einem zweiten Schritt des Drahtendenumformverfahrens für die Drahtenden des ersten Typs;
• 9 eine Ansicht wie in 7 bei einem dritten Schritt des Drahtendenumformverfahrens für die Drahtenden des ersten Typs;
• 10 eine Ansicht wie in 7 bei einem vierten Schritt des Drahtendenumformverfahrens für die Drahtenden des ersten Typs;
• 11 zu Erläuterungszwecken eine Seitenansicht auf den oberen Rand der äußeren Aufnahme- und Dreheinheit von 5 und 6 bei einem ersten Schritt eines Drahtendenumformverfahrens, bei dem Drahtenden des ersten Typs, hier zum Beispiel regelmäßige Pins, und Drahtenden eines zweiten Typs, hier zum Beispiel Sonderpins, welche aus einem Bauteil vorstehen, gemäß dem alternativen Lösungsansatz in Umfangsrichtung umzubiegen und somit zu schränken sind;
• 12 eine Ansicht wie in 11 bei einem zweiten Schritt des alternativen Drahtendenumformverfahrens für die Drahtenden des ersten und zweiten Typs;
• 13 eine Ansicht wie in 11 bei einem dritten Schritt des alternativen Drahtendenumformverfahrens für die Drahtenden des ersten und zweiten Typs;
• 14 eine Ansicht wie in 11 bei einem vierten Schritt des alternativen Drahtendenumformverfahrens für die Drahtenden des ersten und zweiten Typs;
• 15 eine Ansicht wie in 11 bei einem fünften Schritt des alternativen Drahtendenumformverfahrens für die Drahtenden des ersten und zweiten Typs;
• 16 eine Ansicht wie in 11 bei einem sechsten Schritt des alternativen Drahtendenumformverfahrens für die Drahtenden des ersten und zweiten Typs;
• 17 eine Ansicht auf einen oberen Rand einer Aufnahme- und Dreheinheit gemäß einer Ausführungsform der Erfindung bei einem ersten Schritt eines Drahtendenumformverfahrens gemäß einer Ausführungsform der Erfindung, bei dem Drahtenden eines ersten Typs, wie zum Beispiel regelmäßige Pins, und Drahtenden eines zweiten Typs, wie zum Beispiel Sonderpins, die aus einem Bauteil vorstehen, in Umfangsrichtung umzubiegen und somit zu schränken sind;
• 18 eine Ansicht wie in 17 bei einem zweiten Schritt des Drahtendenumformverfahrens gemäß der Ausführungsform der Erfindung;
• 19 eine Ansicht wie in 17 bei einem dritten Schritt des Drahtendenumformverfahrens gemäß der Ausführungsform der Erfindung; und
• 20 eine Ansicht wie in 17 bei einem vierten Schritt des Drahtendenumformverfahrens gemäß der Ausführungsform der Erfindung.

An exemplary embodiment is explained in more detail below with reference to the accompanying drawings. It shows:

• 1 a schematic block diagram of an embodiment of a wire end shaping device;
• 2 a perspective view of an embodiment of a bending device to be used in the wire end shaping device, which has a concentric arrangement of a plurality of receiving and rotating devices and Having drive means for each of the receiving and rotating means;
• 3rd a section through the concentric arrangement of receiving and rotating devices of the bending device of 2 ;
• 4th FIG. 4 is a perspective view of an internal pick and turn assembly of the assembly of FIG 3rd ;
• 5 a section through an outer receiving and rotating unit of the arrangement of 3rd ;
• 6th for explanatory purposes, a perspective illustration of the upper region of a receiving and rotating unit from FIG 5 according to a different approach;
• 7th a side view of the upper edge of the inner receiving and rotating unit of 3rd in a first step of a wire end forming process, in which only wire ends of a first type, here for example regular pins, which protrude from a component, are to be bent in the circumferential direction and thus to be set;
• 8th a view like in 7th in a second step of the wire end forming process for the wire ends of the first type;
• 9 a view like in 7th in a third step of the wire end forming process for the wire ends of the first type;
• 10 a view like in 7th in a fourth step of the wire end forming process for the wire ends of the first type;
• 11 for explanatory purposes, a side view of the upper edge of the outer receiving and rotating unit of FIG 5 and 6th in a first step of a wire end forming process, in which wire ends of the first type, here for example regular pins, and wire ends of a second type, here for example special pins, which protrude from a component, are to be bent in the circumferential direction according to the alternative approach and thus to be set;
• 12th a view like in 11 in a second step of the alternative wire end forming process for the wire ends of the first and second types;
• 13th a view like in 11 in a third step of the alternative wire end forming process for the wire ends of the first and second types;
• 14th a view like in 11 in a fourth step of the alternative wire end forming process for the wire ends of the first and second types;
• 15th a view like in 11 in a fifth step of the alternative wire end forming process for the wire ends of the first and second types;
• 16 a view like in 11 in a sixth step of the alternative wire end forming process for the wire ends of the first and second types;
• 17th a view of an upper edge of a receiving and rotating unit according to an embodiment of the invention in a first step of a wire end forming method according to an embodiment of the invention, in the wire ends of a first type, such as regular pins, and wire ends of a second type, such as Special pins, which protrude from a component, are to be bent in the circumferential direction and thus to be set;
• 18th a view like in 17th in a second step of the wire end forming process according to the embodiment of the invention;
• 19th a view like in 17th in a third step of the wire end forming method according to the embodiment of the invention; and
• 20th a view like in 17th in a fourth step of the wire end forming method according to the embodiment of the invention.

In 1 Fig. 3 is a schematic of a wire end forming apparatus 10 for use in the manufacture of a component of an electrical machine provided with coils. The wire end forming device 10 is for reshaping wire ends 12th consisting of an annular housing 14th protrude trained.

The case 14th is in particular a housing formed from a laminated core 14th of a stator 16 , which is a number n ₃ of annularly around the circumference of the housing 14th having distributed grooves (not shown) into which wire sections of hairpins are inserted, with free ends of the hairpins at one end of the housing 14th as wire ends 12th protrude. These wire ends 12th are to be reshaped in the circumferential direction so as to create pairs of wire ends 12th to form that together to form a winding loop of a winding of the stator 16 are to be connected.

There is a first type of wire ends 12a , e.g. B. the so-called rule pins, which are to be formed into such pairs in order to be connected to turn loops, and there is a second type of wire ends 12b , e.g. B. the so-called special pins, which are used to connect the Winding of the stator 16 serve on interconnection elements or the like.

The wire end forming device 10 has a bending device 18th to bend the wire ends 12th in the circumferential direction, a relative movement device 20th for relative movement of the housing 14th and the bending device 18th and a control unit 22nd on.

The relative movement device 20th is for relative movement of the housing 14th and the bending device 18th in one with respect to the central axis of the housing 14th formed in the axial direction. For example, the relative movement device 20th a housing bracket 24 on where the case 14th is attached, and a movement device 26th to move the housing bracket 24 on. The movement device 26th can be designed differently, for example it can have a lifting device (not shown), a robot arm or the like.

At the end of the case 14th where the wire ends 12th protrude can also be a clamping device 28 for clamping and fixing the wire ends 12th be attached.

For more details on the wire end forming device 10 , the relative movement device 20th , the clamping device 28 and the methods that can be carried out with it, reference is made to the literature [8], [9], [10] and [11].

The control unit 22nd is with the bending device 18th and the relative movement device 20th connected to these according to preprogrammed sequence control programs, which are used as computer programs in the control unit 22nd can be saved to move.

An embodiment for the in 1 bending device shown only as a block 18th is in greater detail in 2 shown. A section through an inner area of the bending device 18th is in 3rd shown.

How 2 and 3rd show has the bending device 18th a first to sixth receiving and rotating device 30a-30f on. Any recording and rotating device 30a-30f each has a receiving and rotating unit 32a-32f and a drive device 34a-34f on. Any drive device 34a-34f each has an annular drive element 36a-36f and an actuator 38a-38f for driving a rotary movement of the drive element 36a-36f on. The drive elements 36a-36f are means of bearings 39 on ring support disks 40a-40f stored, which on a machine frame 42 are attached. The recording and rotating units 32a-32f are arranged concentrically to one another and each to an assigned drive element 36a-36f fastened with screws.

Further details on the basic structure can be found in literature [8] or [9].

4th shows the fourth receiving and rotating unit in perspective 32d , 5 shows a section through the first receiving and rotating unit 32a , and 6th shows a perspective view of an upper area of the first receiving and rotating unit 32a according to one in the German patent application 10 2019 116 235.1 described configuration. The 7th to 10 show side views of a portion of the upper edge of the third receiving and rotating unit 32c during different steps of a bending process for the wire ends 12a of the first type (rule pins), as is basically already known from [8], [9], [10] and [11]. The 11 to 16 show side views of a portion of the upper edge of the first receiving and rotating unit 32a according to the in the German patent application 10 2019 116 235.1 described and shown embodiment during different steps of a bending process for the wire ends 12a of the first type (control pins) and the wire ends 12b of the second type (special pins), as described and shown in this patent application. The 17th to 20th show side views of a portion of the upper edge of the first receiving and rotating unit 32a according to an embodiment of the invention during different steps of a wire end forming process for the wire ends 12a of the first type (control pins) and the wire ends 12b of the second type according to an aspect of the invention. As in the 11 and 17th shown corresponds to the first pickup and rotating unit 32a according to the embodiment of the invention of the first receiving and rotating unit 32a according to the design of the German patent application 10 2019 116 235.1 with the difference that in the embodiment according to the invention, second recordings 48b each with an introduction funnel 54 are provided. This will be discussed in more detail below.

As from the 4th to 20th can be seen, has each receiving and rotating unit 32a-32f a cupboard crown 44 on that a ring area 45 with an annular arrangement 46 of recordings 48 , 48a , 48b for the wire ends 12a includes.

The recordings 48 can through pockets or grooves 50 can be formed, furthermore a ring 52 for the cabinet crown 44 be provided so that each recording 48 through the groove 50 and the ring 52 on the cabinet crown 44 is defined.

While the in 4th fourth recording and rotating unit shown 32d and those in the 7th to 10 shown third recording and rotating unit 32c only recordings evenly distributed around the circumference 48 has, has the annular arrangement 46 the first recording and rotating unit 32a like in the 6th and 11 to 20th shown first recordings 48a to accommodate the first type of wire ends 12a and second recordings 48b for receiving the second type of wire ends 12b.

The first recordings 48a are regularly spaced from one another. Successive first recordings 48a have a circumferential distance a from one another. The circumferential distance a depends on the distribution of the housing grooves in the housing 14th from. In particular, a is equal to U / n ₃ , where U is the entire circumference of the ring area 45 with the annular arrangement 46 and n _{3 represents} the total number of housing grooves. So every first shot is 48a in the circumferential direction to another first recording 48a the annular arrangement 46 spaced by a circumferential distance n ₁ * a, where n _{1 is} a natural number greater than 0. The distances are here, for example, from the center of the groove 50 to the middle of the other groove 50 specified.

The second recordings too 48b are regularly spaced from one another, ie every second recording 48b shows z. B. to another second recording 48b a circumferential distance of n ₂ * a, where n _{2 is} a natural number greater than 0. However, the group is second recordings 48b to the group of first recordings 48a offset in the circumferential direction by a circumferential amount b which is not a multiple of a. In particular, b is between 0.01 * a to 0.99 * a, more in particular between 0.3 * a to 0.7 * a and most preferably 0.5 * a. In other words, the group is preferably second recordings 48b by half a groove pitch a to the group of the first recordings 48a offset in the circumferential direction.

All recordings 48 , 48a , 48b are in the annular arrangement 46 with the same radius to the central axis - corresponds to the axis of rotation of the drive devices 34a-34f - arranged.

With such a wire end forming device 10 the following wire end forming process can be carried out.

First of all, the housing is basically, for example, from the manner known from [6] and / or [7] 14th of the stator 16 with protruding wire ends 12th , 12a , 12b provided. The first type is wire ends 12a Control pins and, as a second type, wire ends 12b Special pins. This case 14th is attached to the housing bracket 24 attached. The clamping device can also 28 for clamping and positioning the wire ends 12th , 12a , 12b be provided. For more details on this, reference is made to the literature [8], [9], [10] and [11].

The 7th to 9 show using the example of the third recording and rotating unit 32c Steps of the wire end forming process that are carried out on a radius where only wire ends of the first type 12a , i.e. only rule pins, protrude. Here is an upper edge area of the third receiving and rotating unit 32c with the regularly spaced recordings 48 and the corresponding wire ends 12th , 12a of the first type shown. The control unit 22nd controls the relative movement device 20 and the bending device 18th so at that inclusion 48 the third recording and rotating unit 32c with the first type of wire ends 12a are aligned. 7th shows the resulting initial situation. Then the wire ends 12a of the first type in the recordings 48 retracted as shown in 8th is shown. Then the third recording and rotating unit 32c rotated by the amount of circumferential displacement y in the direction of rotation in which the wire ends protruding at this radius 12a should be bent. This bending direction can be different depending on the radius and is directed in opposite directions in particular in the case of mutually adjacent receiving and rotating units, that is, for example, in the case of the first, third and fifth receiving and rotating units 32a , 32c , 32e counterclockwise and on the second, fourth and sixth pick and turn units 32b , 32d , 32f directed clockwise. Then the housing 14th and the third pick and turn unit 32c again by relative movement by means of the relative movement device 20th separated from each other. The corresponding setting result is in 10 shown. This in the 7th to 10 The wire end forming process shown is carried out on all those radii where there are no wire ends 12b of the second type protrude. For example, the second through fifth are pick and turn units 32b to 32e purely for reshaping control pins, similar to the third receiving and rotating unit shown 32c alone with the regularly distributed recordings 48 Mistake. Of course, the wire ends can 12b of the second type can also be present at a different diameter, for example on the inside. In other configurations there are wire ends 12b of the second type on two or more of the diameters or radii of the protruding wire arrangement 12th , 12a , 12b available.

At the or every radius, including wire ends 12b of the second type, next to wire ends 12a of the first type, other rotary end forming processes are performed around the wire ends 12b of the second type to restrict to a different set angle. This is explained below based on the configurations of 6th and 11 to 20th explained in more detail.

They show 6th and 11 to 16 Refinements according to the German patent application 10 2019 116 235.1 . In these configurations, the wire ends must 12b of the second type protrude further than the wire ends located on the same radius 12a of the first type.

The control unit 22nd then controls the relative movement device 20th and the bending device 18th so that the second shots 48b with the second type of wire ends 12b are aligned like this in 11 is shown, and so is the second type of wire ends 12b by relative movement between the housing 14th and bending device 18th in the axial direction in the second receptacles 48b be introduced like this 12th shows.

If for example the wire ends 12th in the case of the wire end forming process counterclockwise into 6th are to be bent over when seen, the first pick-up and rotating unit 32a as in 13th shown afterwards with the in the second recordings 48b recorded second type of wire ends 12b initially by the circumferential offset amount b in the opposite direction of rotation - for example clockwise in 6th - rotated, with the case 14th further axially to the bending device 18th is moved. The degree of circumferential displacement b thus determines a first distance x by which the twist angle of the wire ends changes 12b of the second type of the twist angle of the wire ends 12a of the first type should be distinguished. In the illustrated embodiments, the second recordings 48b offset by half a slot pitch (b = 0.5 * a). Thus, with this first rotation, the first receiving and rotating unit 32a Rotated by half a slot pitch (x essentially corresponds to b = 0.5 * a) against the later setting direction. This will make the first recordings 48a to the first type of wire ends 12a axially aligned. By further axial movement towards each other between the housing 14th and bending device 18th become the wire ends 12a of the first type in the first recordings 48a introduced like this in 14th is shown.

Then, as in 15th shown, a rotation of the first recording and rotating unit 32a in the setting direction, i.e. in our example counterclockwise from 6th . This will remove all of the wire ends 12th , 12a , 12b deformed in the circumferential direction until the desired degree of deformation - target angle shown here by the second distance y - is achieved.

By initially setting the ends of the wire 12b of the second type against the desired twisting direction of rotation, the resulting twisting angle is smaller by the first distance x for this second type of wire ends 12b like this in 16 is shown.

In the examples shown here, where x, b correspond to half a slot pitch, the second type of wire ends can be used, for example 12b that is on the same radius as the first type wire ends 12a located opposite these first type of wire ends 12a Bend half a groove pitch less than the first type of wire ends 12a . Of course, these are only examples; other angular displacements are also possible. A second type of wire ends could also be used 12b and a third type of wire ends 12c (by corresponding third receptacles that are offset by the desired amount) are interlaced differently.

As from the above statement and from the 6th and 11 to 16 This difference can be seen in the set angle in the case of the German patent application 10 2019 116 235.1 described execution by a one-piece tool (mounting and rotating unit 32c , Set crown 44 ) and thus easily achieved in terms of process technology. However, the wire ends must 12b of the second type protrude further than the wire ends 12a of the first type, and it is a further step of counter-rotating ( 13th ) necessary.

The 17th to 20th however, show the first recording and rotating unit 32a in an embodiment according to the invention, with which wire ends 12b of the second type, which protrude as far as the wire ends 12a of the first type with one by the first distance x relative to the wire ends 12a of the first type can be folded offset angle.

Like in particular from 17th can be seen, has at least one second recording 48b an introduction funnel 54 with a guide wall 56 on one side. The guide wall 56 extends axially and radially and over at least the distance b in the circumferential direction obliquely and / or curved. Through this extension of the guide wall 56 The first distance x, by which the wire end to be inserted, becomes over the distance dimension b 12b of the second type relative to the wire ends 12a of the first type is to be offset in the circumferential direction.

In the illustrated embodiments, the introduction funnel 54 the at least one second recording 48a on a first side the sloping guide wall 56 and on the opposite second side an arcuately curved course 58 . This will facilitate the insertion of the second type of wire end 12b facilitated.

How out 18th the guide wall can be seen 56 of the introduction funnel 54 the at least one second recording 48b designed to use the associated wire end 12b of the second type already with the axial relative movement of the receiving and rotating units 32a and housing 14th for inserting the wire ends protruding from the housing of essentially the same length 12a , 12b of the first and second type is to be carried out, bent in the circumferential direction in such a way that the at least one wire end 12b of the second type is offset relative to wire ends of the first type in the circumferential direction by the distance x. This distance x corresponds essentially to the circumferential offset b with which the at least one second receptacle 48b compared to the first recordings 48a is offset. The guide wall 56 is inclined or curved in the direction opposite to the direction of rotation to be carried out for setting. It extends at least over the distance b and opens into the area of the second receptacle 48b , the middle of the groove opposite the middle of the groove of the first recordings 48a is offset in the circumferential direction by the distance b.

This can be done in the following using the 17th to 20th Perform explained wire end forming process according to a preferred embodiment of the invention.

The control unit 22nd controls the relative movement device 20th and the bending device 18th so at that the first inclusion 48a the first recording and rotating unit 32a with the first type of wire ends 12a are aligned. 17th shows the resulting initial situation. The wire end shown here 12b the second type is not associated with the second recording 48b aligned, but lies in the circumferential direction on a position that is through the introduction funnel 54 is covered. In particular, the guide wall extends 56 In the embodiment shown, more in the circumferential direction than over the distance dimension b, and further this guide wall is located 56 of the introduction funnel 54 in this starting position on a circumferential position in which they are in the circumferential direction on both sides over the second type of wire end 12b protrudes.

Then the wire ends 12a of the first type in the first recordings 48a retracted as shown in 18th is shown. The second end of the wire grips 12b of the second type the guide wall 56 and is due to their inclined course by the first distance x, which is here essentially the circumferential offset b of the second recordings 48b relative to the first recordings 48a corresponds, when inserting against the deformation direction of rotation - here, for example, counterclockwise, as explained above - offset by bending. The guide wall 56 is located on the side of the second recording 48b in the direction of rotation of the first receiving and rotating unit 32a for reshaping the wire ends 12a , 12b is in front.

Then, as in 19th shown, the first recording and rotating unit 32a rotated by the amount of circumferential displacement y in the direction of rotation in which the wire ends protruding at this radius 12a should be bent - here, for example, counterclockwise.

20th shows the setting result of this wire end forming process according to the preferred embodiment of the invention. Through the dotted lines is the position that a corresponding wire end 12a of the first type according to the regular spacing of these wire ends 12a instead of the wire end provided here 12b of the second type would have suggested. The end of the wire 12b of the second type 12b is opposite the wire ends 12a of the first type 12a by the first distance x, that of the offset b of the second recording 48b compared to the usual circumferential position of a corresponding first recording 48a corresponds, offset in the circumferential direction and can nevertheless be designed to be of the same length or to protrude the same length at the beginning as the wire ends 12a of the first type.

This wire end forming process works when at least one wire end 12b of the second type is arranged with the same radius as wire ends to be formed at the same time 12a of the first type. It's at least a second shot 48b with the introduction funnel 54 to be provided. In the case of other configurations, the same applies as above using the example of FIG 6th explains a group of such second recordings 48b intended. A specific embodiment of the receiving and rotating unit according to the invention 32a results, for example, from the fact that every second recording 48b of 6th as in 17th shown in each case with the introduction funnel 54 are provided. A group of wire ends can then be used accordingly 12b of the second type together with the wire ends of the first type 12a be reshaped.

As from a comparison of the 7th to 10 with the 17th to 20th can be seen, the wire end forming process according to the preferred embodiment of the invention for forming the wire ends at the same time 12a , 12b of the first and second type with the introduction funnels on the second receptacles 48b completely analogous and at the same time as the wire ends are formed 12a of the first type can be carried out on the other radii. You just have to take those of the pickup and turntable units 32a to 32f , the wire ends at the same time 12a , 12b of the first and the second type are to reshape, with the from 17th evident Special arrangement of recordings 48a , 48b and can otherwise leave the process control the same as the process control of the manufacturing processes from [8] to [11].

Albeit the special arrangement of the first and second recordings 48a , 48b using the example of the outermost first receiving and rotating unit 32a has been shown and described, in other preferred embodiments are provided here as an example of the second type of wire ends 12b named special pins in the radially innermost position in the respective housing grooves. Accordingly, in these preferred exemplary embodiments, the first receiving and rotating unit does not have 32a , but the sixth receiving and rotating unit furthest inside 32f which are based on the 6th to 20th explained special arrangement of first recordings 48a and second recordings 48b on. The other pick-up and rotating units 32a-32e can be a regular arrangement of recordings 48 as shown in 4th and 7th to 10 is shown. They are only used for reshaping control pins - first type wire ends 12a - used, which are located on other radii in the housing grooves. The reshaping of these other ends of the wire 12th takes place together with the reshaping of the wire ends 12th , 12a , 12b the radially innermost layer. How wire ends can be crossed together on different radii is described in more detail in [8], [9], [10] and [11], so that reference can also be made to these with regard to further details. These literature references also contain the further steps for manufacturing the, for example, as a stator 16 trained components of the electrical machine described and explained.

Of course, in other embodiments not shown here, other of the housing grooves can also be special pins or similar wire ends 12b of the second type, so that other of the receiving and rotating units 32a-32f the explained special arrangement of first and second recordings 48a , 48b can have. If the special arrangement is provided for the outermost layer, then the setting crown 44 preferably also a sleeve - for example in the form of a ring 52 - on so that the wire ends 12a , 12b Do not move radially outwards during the bending process.

Although in the illustrated embodiments, the guide wall 56 is shown running at an incline in a straight line, designs are of course also conceivable in which the guide wall 56 runs at least partially curved.

List of reference symbols

10

Wire end forming device

12th

Wire end

12a

first type of wire ends

12b

second type of wire ends

14th

casing

16

stator

18th

Bending device

20th

Relative movement device

22nd

Control unit

24

Housing bracket

26th

Movement device

28

Clamping device

30a

first recording and rotating device

30b

second recording and rotating device

30c

third recording and rotating device

30d

fourth recording and rotating device

30e

fifth recording and rotating device

30f

sixth recording and rotating device

32a

first recording and rotating unit

32b

second recording and rotating unit

32c

third recording and rotating unit

32d

fourth recording and rotating unit

32e

fifth recording and rotating unit

32f

sixth recording and rotating unit

34a

first drive device

34b

second drive device

34c

third drive device

34d

fourth drive device

34e

fifth drive device

34f

sixth drive device

36a

first drive element

36b

second drive element

36c

third drive element

36d

fourth drive element

36e

fifth drive element

36f

sixth drive element

38a

first actuator

38b

second actuator

38c

third actuator

38d

fourth actuator

38e

fifth actuator

38f

sixth actuator

39

warehouse

40a

first ring support disc

40b

second ring support disc

40c

third ring support disc

40d

fourth ring support disc

40e

fifth ring support disc

40f

sixth ring support disc

42

Machine frame

44

Set crown

45

Ring area

46

annular arrangement

48

admission

48a

first shot

48b

second shot

50

Groove

52

ring

54

Introduction funnel

56

Guide wall

58

curved course

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• US 6519993 B2 [0002]
• US 8215000 B2 [0002]
• WO 2012/093413 A1 [0002]
• DE 102014208082 A1 [0002]
• DE 102014206105 B4 [0002]
• WO 2018/233774 A1 [0002]
• WO 2018/233771 A1 [0002]
• DE 102018103929 A1 [0002]
• WO 2019/161846 A1 [0002]
• DE 102018103927 A1 [0002]
• WO 2019/161832 A1 [0002]
• DE 102019116235 [0046, 0055, 0068, 0079, 0085]

Claims (12)

Receiving and rotating unit (32a) for use in the manufacture of a component of an electrical machine provided with coils for receiving and rotating wire ends (12a, 12b) protruding from an annular housing (14) of the component for the purpose of bending the wire ends (12a, 12b) in the circumferential direction, comprising an annular area (45) with an annular arrangement (46) of receptacles (48a, 48b) for wire ends (12a, 12b), which are designed such that the wire ends (12a, 12b) by relative movement of the receiving and The rotary unit (32a) and housing (14) can be pushed in the axial direction into the receptacles (48a, 48b) and can be bent in the circumferential direction by rotating the receptacle and rotary unit (32a) relative to the housing (14), the arrangement (46 ) of receptacles (48a, 48b) has a first group of first receptacles (48a) for a first type of wire ends (12a) and at least one second receptacle (48b) for at least one wire end (12b) of a second type, whereby ei the first receptacles (48a) have a defined circumferential distance of n ₁ × a relative to one another, the at least one second receptacle (48b) being offset in the circumferential direction by a circumferential offset b unequal nxa to a circumferential position corresponding to a first receptacle, which is to the first Recordings with the defined circumferential _{distance n 1} × a are spaced, where a and b are constant linear dimensions in the circumferential direction and n ₁ and n are natural numbers greater than zero and where the at least one second receiver (48b) has an introduction funnel (54) with a guide wall ( 56) has on one side, which extends axially and radially and over at least the distance b in the circumferential direction obliquely and / or curved. Pickup and turntable Claim 1 , characterized by a second group of second receptacles (48b) for several wire ends (12b) of the second type, the second receptacles (48b) relative to one another have a defined circumferential distance of n ₂ × a, where n _{2 is} a natural number greater than zero , wherein the first group and the second group are offset from one another in the circumferential direction by the circumferential offset b, and wherein each second receptacle (48b) the insertion funnel (54) with the inclined and / or inclined in the axial direction and over at least the distance b in the circumferential direction having curved guide wall (56). Receiving and rotating unit according to one of the preceding claims, characterized in that the insertion funnel (54) of the at least one second receiving means has the inclined guide wall (56) on a first side and an arcuate curve (58) on the opposite, second side. Has. Receiving and rotating unit according to one of the preceding claims, characterized in that the guide wall (56) of the insertion funnel (54) of the at least one second receptacle (48b) is designed to hold the associated wire end (12b) of the second type during the axial relative movement of the receiving and rotating unit (32a) and the housing (14), which are to be carried out in order to insert the wire ends (12a, 12b) of the first and second types protruding from the housing of essentially the same length, in the circumferential direction in such a way that the at least one wire end (12b) of the second type is offset relative to wire ends of the first type in the circumferential direction by the distance b. Receiving and rotating unit (32a) according to one of the preceding claims, characterized in that 5.1 that b is a value from 0.001 × a to 0.999 × a and / or 5.2 that b is a value from 0.3 × a to 0.7 × a and / or 5.3 that b is equal to 0.5 × a and / or 5.4 that the following applies to a: a = U / n ₃ , where U is the total circumference of the ring area (45) and n _{3 is} a natural number greater than 1, in particular greater than 20. Receiving and rotating unit (32a) according to one of the preceding claims, characterized in that 6.1 that the receiving elements (48a, 48b) are designed as grooves (50) or pockets and / or 6.2 that the receiving and rotating unit (32a) are designed as a setting crown ( 44) is formed and / or 6.3 that the first and second receptacles (48a, 48b) have the same radial distance from an axis of rotation of the receiving and rotating unit (32a) and / or 6.4 that the ring area (45) is designed in one piece and / or 6.5 that the receiving and rotating unit (32a) is designed in one piece. Wire end shaping device (10) for use in the production of a component of an electrical machine provided with coils, for shaping wire ends (12, 12a, 12b) protruding from an annular housing (14) of the component, comprising a bending device (18) for bending wire ends (12, 12a, 12b) in a circumferential direction, a relative movement device (20) for relatively moving the housing (14) and the bending device (18) in an axial direction and a control unit (22), the bending device (18) having at least one receptacle - And rotating unit (32a) according to one of the preceding claims and a rotary drive for a Has relative rotation between the receiving and rotating unit (32a) and the housing (14), the control being designed to carry out a relative movement of the housing (14) and the bending device (18) in the axial direction until the at least one wire end (12b) of the second Type with bending in the circumferential direction by the guide wall for displacement in the circumferential direction into which at least one second receptacle (48b) is inserted and the wire ends (12a) of the first type are inserted into the first receptacles (48a), and then a relative rotation between the receiving and Rotary unit (32a) and housing (14) with wire ends (12a, 12b) inserted into the receptacles (48a, 48b) in order to circumferentially transfer the wire ends (12a) of the first type and the at least one wire end of the second type offset in the circumferential direction to bend. Wire end forming device according to Claim 7 , characterized in that the surface of the guide wall (56) which contacts the wire end (12b) of the second type faces in the direction opposite to the direction of rotation of the relative rotation. Wire end forming method for forming wire ends (12a, 12b) protruding from an annular housing (14) in the course of the production of a component of an electrical machine provided with coils, comprising: a) providing a receiving and rotating unit (32a) which comprises an annular region (45) with an annular arrangement (46) of receptacles (48a, 48b) for the wire ends (12a, 12b), the arrangement (46) of receptacles (48a, 48b) has a first group of first receptacles (48a) for a first type of wire ends (12a) and at least one second receptacle (48b) for at least one wire end (12b) of a second type, the second receptacle (48b) having a Has an insertion funnel (54) with a guide wall (56) on one side, which extends axially and radially and over at least one distance b in the circumferential direction, running obliquely and / or curved b) relative movement of the housing (14) and the receiving and rotating unit (32a) in the axial direction until the at least one wire end (12b) of the second type, under guidance by the guide wall (56), is bent in the circumferential direction and at least by the stretching dimension b, offset in the circumferential direction with respect to its original circumferential position, into which at least one second receptacle (48b) is inserted and the wire ends (12a) of the first type are inserted into the first receptacles (48a), and c) relative rotation of the receiving and rotating unit (32a) and the housing (14) with the wire ends (12a, 12b) inserted into the receptacles (48a, 48b) around the wire ends (12a, 12b) of the first and second types in Reshape circumferential direction. Wire end forming process according to Claim 9 , characterized in that step a) providing a receiving and rotating unit (32a) according to one of the Claims 1 to 6th comprises and / or that the method with a wire end shaping device (10) according to one of the Claims 7 or 8th is carried out. Wire end forming process according to Claim 10 , characterized in that in step a) the receiving and rotating unit (32a) is provided in such a way that for a: a = U / n ₃ , where U is the total circumference of the ring area (45) and n _{3 is} the number of housing grooves of the housing (14) from which the wire ends (12a, 12b) protrude. Wire end forming process according to one of the Claims 6 to 8th , characterized in that the direction of rotation in step c) is opposite to the direction of bending and displacement of the at least one wire end (12b) of the second type of step b).

Images