Method for electrically contacting a stranded wire winding to a carrier plate and a stranded wire winding

Abstract

The invention relates to a method for contacting a winding with a carrier plate, wherein the winding has a first axial end and an opposite second axial end, and wherein the winding comprises at least two stranded wire ends for electrical connection to the carrier plate and wherein the stranded wire ends have individual wires and protrude beyond an axial end of the winding, are aligned substantially parallel to the axis of the winding and are distributed over at least a partial circumference of the winding, and wherein the carrier plate has a first end face facing the stranded wire ends and a second end face facing away from the stranded wire ends as well as a lateral surface, and wherein the first end face has recesses for receiving the stranded wire ends, comprising the following method steps: - combining the stranded wire end and a sleeve, so that the sleeve surrounds the stranded wire end over at least part of its length, at least in sections, - electrically contacting the stranded wire end with the sleeve, - inserting the stranded wire end fitted with the sleeve into the recess in the carrier plate, wherein according to the invention the winding is a stranded wire winding and the stranded wire ends have insulated individual wires and the insulation comprises a high-temperature-resistant coating, wherein after inserting the stranded wire end fitted with the sleeve into the recess of the carrier plate, the stranded wire ends remain substantially aligned parallel to the axis of the winding, and the sleeve and the carrier plate are electrically contacted with one another.

Description

[0001] Method for electrically contacting a stranded wire winding to a carrier plate and stranded wire winding

[0002] The present invention relates to a method for contacting a winding on a carrier plate according to the preamble of independent claim 1 and to a stranded wire winding suitable for the method according to independent claim 12.

[0003] A generic process is used in the manufacture of electric motors and in particular in the manufacture of small electric motors.

[0004] To bundle the strands of a winding wire, it is common practice to hold the end of the winding wire open in a solder bath and thus tin it. Depending on the type of insulating varnish, however, there is a risk that the varnish will not melt completely and the strands will not be optimally bundled, which further complicates electrical contact. Insulating varnish for sterilizable windings, in particular, is very heat-resistant and therefore prone to faulty contact when used in a solder bath.

[0005] To ensure a good and secure connection to the carrier plate, the strands are inserted into sleeves and the sleeve is then electrically contacted with the carrier plate.

[0006] Since the installation space in the radial direction is very limited in small electric motors, in particular in small electric motors with a diameter of less than 100 mm and especially in small electric motors with a diameter of less than 60 mm, the ends of the stranded wire together with the sleeve should advantageously maintain their axial alignment relative to the winding.

[0007] A method for contacting a winding with a carrier plate according to the preamble of claim 1 is known from DE102017206187. This document shows the contacting of a winding with a carrier plate by inserting the ends of the winding into crimp terminals attached to the carrier plate and crimping them to them. Subsequently, the crimp terminals, together with the winding ends, are deformed into recesses so that the ends of the winding wires are no longer aligned axially with the winding, but are bent radially inward or radially outward and positioned essentially parallel to the surface of the carrier plate.

[0008] However, such a method requires a lot of space in the radial direction and is unsuitable for stranded wire windings, as bending the wire ends poses the risk of individual strands breaking. Another prior art document is LIS2011012468. It shows a radial gap motor with a hollow cylindrical winding. The winding is contacted to a carrier plate via its winding ends, which can consist of one or more wires, with the winding ends being inserted into through holes in a carrier plate for this purpose. Crimping of the winding ends, however, is not described, nor is it explained how exactly the winding ends are contacted to the carrier plate.

[0009] Especially in small electric motors, very limited space is available for connecting the winding to the carrier plate. This makes the secure contact of winding ends, which consist of a large number of individual wires, all the more complex.

[0010] The present invention therefore has for its object to provide a simple method for compact and secure contacting of a stranded wire winding with a carrier plate and a stranded wire winding produced according to this method.

[0011] The object is achieved by the features of independent claims 1 and 12. Accordingly, in a method according to the preamble of independent claim 1, an inventive solution to the object is present if the winding is a stranded wire winding and the stranded wire ends have insulated individual wires and the insulation comprises a high-temperature-resistant varnish, wherein after the stranded wire end equipped with the sleeve has been inserted into the recess of the carrier plate, the stranded wire ends remain aligned substantially parallel to the axis of the winding and the sleeve and the carrier plate are electrically contacted with one another.

[0012] According to the invention, the stranded wire ends are aligned substantially parallel to the axis of the stranded wire winding both before and after inserting the sleeves into the recesses. "Substantially parallel" means that the deviation of the angle of alignment of the individual stranded wire ends to the axis of the stranded wire winding is a maximum of 15°, preferably a maximum of 10°, and particularly preferably a maximum of 5°. This has the advantage that hardly any installation space is required in the radial direction and the stranded wire ends are not subjected to severe bending.

[0013] The winding is a stranded wire winding consisting of individual wires along its entire length. The individual wires are each electrically insulated with varnish along their entire length, thus insulating them from each other. The stranded wire ends also have insulated individual wires, which are fitted with a sleeve. Stranded wires are more flexible than a wire with the same conductor cross-section, and eddy currents can be avoided or reduced. The winding can be used to generate an electromagnetic field in a slotless or ironless motor.

[0014] Advantageous embodiments of the invention are the subject of the subclaims.

[0015] The stranded wire winding is preferably designed as a hollow cylinder. However, the method according to the invention can also be applied to stranded wire windings of other designs known to those skilled in the art.

[0016] According to an advantageous embodiment of the present method, the sleeve is designed as a closed sleeve, and to bring the sleeve and the stranded wire end together, the sleeve is pushed over the stranded wire end such that the stranded wire end is completely radially enclosed by the sleeve over at least part of its length. The sleeve can be pushed completely onto the stranded wire end so that the tip of the stranded wire end protrudes beyond the sleeve. However, it is also conceivable for the sleeve to be only partially pushed onto the stranded wire end so that the tip of the stranded wire end lies within the sleeve. Preferably, the sleeve is pushed onto the stranded wire end at least up to half its length, more preferably at least up to three-quarters of its length. The sleeve can have a funnel shape on at least one side so that the strands of the stranded wire can be inserted into the sleeve more easily.

[0017] According to a further advantageous embodiment of the present method, when the sleeve is joined to the stranded wire end, it is designed as a sleeve blank which is formed into the shape of a sleeve and thus completely radially encloses the stranded wire end over at least part of its length. The sleeve blank is preferably designed as a sheet metal strip, wherein the sheet metal strip has a width and a length and wherein the length of the sheet metal strip is at least twice the width of the sheet metal strip and preferably the length is at least three times the width. The sheet metal strip is positioned along its length orthogonal to the orientation of the stranded wire end such that the sheet metal strip and the stranded wire end touch. The sheet metal strip is then bent inwards, i.e. towards the stranded wire end, until the sheet metal strip completely or almost completely encloses the stranded wire end.Advantageously, the sheet metal strip is bent three times so that the stranded wire end is completely enclosed. It is also conceivable for the sheet metal strip to be bent a fourth time so that two of the surfaces of the sheet metal strip created by bending overlap. Subsequent electrical contact creates a secure electrical connection between the bent sheet metal strip and the stranded wire end. This can be done by soldering, crimping, or other measures known to those skilled in the art. The advantage over a closed sleeve and a slotted sleeve is that the sleeve blank does not have to be guided over the sensitive tips of the individual wires at the stranded wire end, thus significantly minimizing the risk of bending or breaking and, as a result, improper contact.

[0018] The sleeve is preferably open on both sides in the axial direction so that when the stranded wire end makes electrical contact with the sleeve, insulating varnish can escape from the sleeve on both sides. This enables particularly good electrical contact between the stranded wire end and the sleeve. Both the closed sleeve and the sleeve blank, which is formed into the shape of a sleeve, are open on both sides in the axial direction and thus each have two openings in the axial direction. This allows insulating varnish or, for example, tin and other substances that reduce the electrical conductivity of the contact to escape from the sleeve on both sides when the stranded wire end makes electrical contact with the sleeve. Because the substances escape from both sides of the sleeve, a bubble of insulating varnish does not form, for example, on a closed side of the sleeve, which would impair the electrical contact between the stranded wire end and the sleeve.During the connection process between the sleeve and the stranded wire end, the sleeve can be compressed on one side. This only slightly affects the flow of varnish during the connection process between the stranded wire end and the sleeve and does not lead to bubbles of insulating varnish and deterioration of the contact between the stranded wire end and the sleeve. The sleeves can be wire end ferrules and have a funnel in the axial direction on at least one side, which facilitates the insertion of the stranded wires into the sleeve.

[0019] According to a particularly advantageous embodiment of the present method, the sleeve is contacted by crimping and preferably by hot crimping with the individual wires of the stranded wire end lying on the inner circumference. The individual wires of the stranded wire end are preferably electrically insulated by insulating varnish. The crimping tool squeezes the sleeve in such a way that the copper of the individual wires is electrically connected to the crimped sleeve. The advantage of hot crimping is that by heating the area of ​​the stranded wire end enclosed by the sleeve, the insulating varnish of the individual wires of the stranded wire end is melted away. The heating takes place to at least 200°C and preferably to at least 250°C. At these temperatures, the insulating varnish surrounding the individual wires is melted away. Depending on the type of insulating varnish, higher temperatures may be required.Insulating varnish suitable for sterilizable parts requires higher temperatures to melt completely, thus enabling good contact between the individual wires at the stranded wire end and the sleeve. For sterilizable parts, such as windings, high-temperature-resistant insulating varnish (e.g., VT220) can be used. High-temperature-resistant insulating varnishes are varnishes that have a softening temperature greater than 300°C according to IEC 60851-6 4. These are preferably polyamide-imide varnishes, which are also suitable for sterilizable components. When using high-temperature-resistant or sterilizable varnish for windings, the stranded wire ends should be heated to 500°C to 900°C, preferably 750°C. At this temperature, the high-temperature-resistant varnish reaches a low viscosity or partially evaporates.The pressure of the crimping tool presses the insulating varnish out of the connection between the stranded wire and the crimp, creating a more or less pure metal connection. The metal connection provides very good contact with high electrical and thermal conductivity. The sleeves or crimp sleeves can be made of tinned copper. The high temperature also liquefies the tin on the surface of the crimp, and the pressure of the crimping tool presses it out of the connection. This creates a particularly pure copper connection between the stranded wires and the sleeve, which conducts electrical current particularly well. The insulating varnish pressed out of the crimp connection, as well as the tin that is also partially pressed out of the crimp connection, partially solidifies at the exit points of the crimp sleeve, forming a protective layer that protects the underlying contact between the stranded wire and the sleeve from corrosion.

[0020] Heating is preferably achieved by applying an electric current with a current of 100 A to 200 A and preferably with a current of 140 A to 160 A. In addition to good electrical contact, one advantage of hot crimp connections is their robustness against vibrations.

[0021] By applying a high current to the sleeve, heat can be generated very locally within the crimp sleeve. This reduces the amount of heat generated in the immediate vicinity of the sleeve, which is particularly advantageous for small or short motors. This process is particularly suitable for contacting motors that operate at high temperatures or for motors that are exposed to high temperatures, for example, during a sterilization process.

[0022] According to a particularly preferred embodiment of the present method, the sleeve has a first width and a second width, wherein the first and second widths are aligned orthogonal to the longitudinal axis of the stranded wire end. The first and second widths can be aligned at a right angle to one another. After electrical contact, the first width of the sleeve has a spatial extent twice that of the second width. Preferably, the first width is four times wider than the second width. The sleeve therefore has a flattened shape after crimping. According to a further preferred embodiment of the present method, for contacting the stranded wire end with the sleeve, the stranded wire end is immersed in a tin bath until the insulation of the individual wires of the stranded wire end has melted. The time required to melt the insulation can be between 2 and 8 seconds, preferably 5 seconds.The time required to melt the insulation depends on the type of insulation used. Insulating varnish for sterilizable windings, in particular, is very heat-resistant, which results in a longer melting time.

[0023] According to a particularly preferred embodiment of the present method, the recess of a first end face of the carrier plate has a depth that extends orthogonally from the first end face in the direction of a second end face, and the recess has a first width and a second width, wherein the first width and the second width are aligned at a right angle to one another, and wherein the sleeve is contacted with the stranded wire end in such a way that at least one width of the sleeve can be brought together with at least one width of the recess of the first end face in such a way that there is a play of at least 0.1 mm, preferably of at least 1 mm, and more preferably of at least 2 mm. The difference between the first width of the sleeve and the first width of the recess is thus at least 0.1 mm, preferably at least 1 mm, and more preferably at least 2 mm.Furthermore, the difference between the second width of the sleeve and the second width of the recess is at least 0.1 mm, preferably at least 1 mm and more preferably at least 2 mm.

[0024] Preferably, the sleeve and recess are matched in such a way that the sleeve can be inserted into the recess without jamming, and no more play is allowed than necessary for the easiest possible assembly. This spacing also allows solder to flow from one end face through the recess to the opposite end face of the circuit board, thus enabling good electrical contact between the sleeve and the carrier board.

[0025] The stranded wire winding and the carrier plate are aligned coaxially to insert the sleeves into the recess. By rotating around the common axis, the stranded wire winding and the carrier plate are aligned such that the sleeve can be inserted into the recess by axially displacing the stranded wire winding and / or the circuit board. Preferably, the profiles of the recess and / or the sleeve, which are defined by the respective first and second widths of the sleeve and the recess, are tapered, so that assembly is further facilitated by this type of guidance.

[0026] According to a particularly preferred embodiment of the present method, the recesses on the first end face of the carrier plate are designed to be open throughout to the second end face and to the lateral surface, wherein the carrier plate and the stranded wire winding are aligned with one another in such a way that the axis of the stranded wire winding and the longitudinal axis of the carrier plate, which runs orthogonal to the first end face of the carrier plate, run parallel to one another, and wherein the carrier plate and stranded wire winding are aligned with one another in the axial direction in such a way that the sleeve can be inserted into the recess by a movement radially inwards. Alternatively, it is conceivable that the stranded wire winding is moved as a whole in the direction of the recess to insert the sleeve.It is also conceivable that the carrier plate including the recess is moved towards the sleeve or that the sleeve and recess are moved towards each other and the sleeve is thereby inserted into the recess.

[0027] According to a particularly preferred embodiment of the present method, the recesses are designed as elongated holes that are open towards the lateral surface of the carrier plate, wherein the alignment of the longitudinal axis of the elongated holes in the radial direction has an angle to the circle center of the end face, wherein this angle is 30°-60° and preferably 40°-50° and wherein the sleeve is inserted into the elongated holes of the carrier plate by radial displacement and the displacement is superimposed by an additional rotational movement of the carrier plate around the center of the end face. Advantageously, for this embodiment of the method according to the invention, the sleeves are aligned according to the position of the elongated holes. The widths of the sleeve and the recess are therefore coordinated not only in terms of size but also in their orientation. The first width of the sleeve can therefore extend in the direction of the longitudinal axis of the elongated hole.

[0028] Following insertion into the recess of the carrier plate, the sleeve is electrically contacted with the carrier plate. During electrical contacting, a secure electrical contact is established between these two components by soldering, crimping, or another method known to those skilled in the art. According to a preferred embodiment of the present invention, the sleeve is electrically contacted with the carrier plate by soldering.

[0029] The invention particularly preferably provides a stranded wire winding, which is preferably produced according to one of the described embodiments of the claimed method. According to a particularly preferred embodiment of the stranded wire winding according to the invention, one stranded wire end comprises at least five individual wires and preferably at least fifteen individual wires. The stranded wire winding can also comprise between 20 and 60 individual wires.

[0030] According to a further preferred embodiment of the stranded wire winding according to the invention, the insulation of the individual wires of the stranded wire winding comprises a sterilizable lacquer. Sterilizable lacquer is characterized by its heat resistance, which is why hot crimping is preferably used to contact the stranded wire ends with the sleeve. Alternatively, the sleeve can also be contacted with the stranded wire end using a tin bath. The time during which the sleeve, together with the stranded wire end, is exposed to the tin bath must be correspondingly longer than when using a non-sterilizable lacquer. Alternatively or additionally, the tin bath can be heated to a higher temperature. For example, the temperature of the tin bath can be more than 300°C and up to 400°C.

[0031] According to a further preferred embodiment of the stranded wire winding according to the invention, the stranded wire ends are arranged over a circumferential section of at most 180° and preferably over a circumferential section of at most 150° of the stranded wire winding. The recesses in the first end face of the carrier plate are correspondingly also distributed over a circumferential section of at most 180° and preferably over no more than 150° and are arranged such that, with coaxial alignment of the stranded wire winding and carrier plate, they can be positioned by rotating the stranded wire winding or carrier plate such that the stranded wire ends can be guided into the recesses by a movement in the axial direction of the stranded wire winding or the carrier plate.

[0032] The method according to the invention is explained below with reference to the figures.

[0033] They show:

[0034] Figure 1: a schematic representation of a stranded wire winding according to the invention and a carrier plate

[0035] Figure 2: a schematic representation of the stranded wire end according to Figure 1

[0036] Figure 3a: a schematic representation of a stranded wire end with a closed sleeve Figure 3b: a schematic representation of a stranded wire end with a closed sleeve Figure 4: a schematic representation of the positioning of a sleeve blank to the stranded wire end

[0037] Figure 5: a schematic representation of the alignment of the stranded wire ends Figure 6: a schematic representation of alternative embodiments of the carrier plate

[0038] Figure 7: a schematic representation of the stranded wire winding and the carrier plate after carrying out the method according to the invention

[0039] In the following embodiments, identical parts are designated by identical reference numerals. If a figure contains reference numerals that are not further explained in the corresponding figure description, reference is made to the preceding or subsequent figure descriptions.

[0040] Figure 1 schematically shows a first embodiment of a stranded wire winding 1 with four stranded wire ends 5. The stranded wire winding 1 has a hollow cylindrical shape with a first axial end 3, a second axial end 4, which is opposite the first axial end 3, and an axis 7. An axial direction 18 and a radial direction 19 are defined with respect to the stranded wire winding 1. The stranded wire ends 5 comprise, as shown in Figure 2, a plurality of individual wires 6, are aligned parallel to the axis 7 of the stranded wire winding 1, and extend beyond the second axial end 4. Furthermore, the stranded wire ends 5 are distributed over a partial circumference of the stranded wire winding 1, in this first embodiment approximately over a quarter of the circumference of the stranded wire winding 1. Figure 1 further shows a carrier plate 2 with a first end face 8 facing the stranded wire winding 1, a second end face 9, and a lateral surface 10.The carrier plate 2 is circular and has a longitudinal axis 24. The four recesses 11 of the first end face 8 have a depth of 15 and extend continuously to the second end face 9. The stranded wire winding 1 and the carrier plate 2 are aligned coaxially with each other, and, as can be clearly seen in Figure 1, the stranded wire ends 5 and the recesses 11 are also axially aligned with each other.

[0041] As shown in Figure 2, a stranded wire end 5 comprises a plurality of individual wires 6. Preferably, a stranded wire end 5 comprises at least fifteen individual wires 6. The stranded wire end 5 is contacted by a sleeve 12, wherein the sleeve 12 completely surrounds part of the stranded wire end 5. The sleeve 12, which has a first width 13, can be designed as a closed sleeve 12, see Figure 3, wherein the sleeve 12 is then pushed onto the stranded wire end 5. Alternatively, the sleeve 12 can be designed as a sleeve blank 22 before contacting, see Figure 4. In the exemplary embodiment shown, the stranded wire end 5 projects beyond the sleeve 12. However, it is also conceivable that the connection between the stranded wire end 5 and the sleeve 12 is designed such that the tips of the stranded wire end 5 end within the sleeve 12.

[0042] The sleeve 12 is open on both sides in the axial direction so that when the stranded wire end 5 is electrically contacted with the sleeve 12, insulating varnish can escape from the sleeve on both sides. This enables particularly good electrical contact between the stranded wire end 5 and the sleeve 12. Both the closed sleeve 12 and the sleeve blank 22, which is formed into the shape of a sleeve 12, are open on both sides in the axial direction and thus each have two openings in the axial direction. As a result, when the stranded wire end 5 is electrically contacted with the sleeve 12, insulating varnish or, for example, tin and other substances which reduce the electrical conductivity of the contact can escape from the sleeve 12 on both sides in the axial direction along the stranded wire end 5. As a result of the substances escaping from the sleeve 12 on both sides, no, for example,on a closed side of the sleeve 12, a bubble of insulating varnish, which impairs the electrical contact between the stranded wire end 5 and the sleeve 12. During the connection process between the sleeve 12 and the stranded wire end 5, the sleeve 12 can be pressed together on one side; this only slightly influences the outflow of varnish during the connection process between the stranded wire end 5 and the sleeve 12 and does not lead to a bubble of insulating varnish and deterioration of the contact between the stranded wire end 5 and the sleeve 12. The sleeve 12 can be a wire end ferrule and have a funnel on at least one side in the axial direction, which funnel facilitates the insertion of the stranded wire ends 5 into the sleeve 12. Sleeve 12 can also have a funnel on both sides. The funnel shape of the sleeve is not shown in Figure 2.

[0043] Figures 3a and 3b show the section AA from Figure 2 through the sleeve 12. The sleeve 12 is designed as a closed sleeve and surrounds several individual wires 6. The sleeve 12 and the stranded wire end 5 are contacted with one another and the sleeve 12 has a first width 13 and a second width 14 which are aligned orthogonal to the axis 7 of the hollow cylindrical winding and at a right angle to one another, wherein the first width 13 corresponds approximately to three times the length of the second width 14. It is clearly visible that the sleeve has a flattened shape. In Figure 3a, the outer edges of the first width 13 and the second width 14 are straight. The outer edges can be at a right angle to one another, as shown in Figure 3a. In particular, the outer edges of the second width can also run in a semicircle, as shown in Figure 3b.

[0044] The lower illustration of Figure 4 shows section AA in an alternative embodiment. The sleeve 12 is designed as a sleeve blank 22 before contacting. As the upper illustration of Figure 4 shows, the sleeve blank 22 can, for example, be designed as a sheet metal strip. The sheet metal strip is aligned orthogonally to the stranded wire end 5 along its length and is brought towards the stranded wire end 5 such that the stranded wire end 5 and the sheet metal strip touch. The sheet metal strip is then bent inwards, i.e. towards the stranded wire end 5, until the sheet metal strip completely or almost completely encloses the stranded wire end 5. A possible result of this bending process is shown in the lower illustration of Figure 4. The sheet metal strip is bent four times so that two of the surfaces of the sheet metal strip created by the bending overlap. Fourfold bending is also conceivable, whereby the two overlapping surfaces only partially overlap.Alternatively, bending three times may be sufficient, in which case overlapping is omitted. Subsequent contacting creates a secure electrical connection between the bent sheet metal strip and the stranded wire end 5. The advantage over a closed sleeve 12 and a slotted sleeve is that the sleeve blank 22 does not have to be guided over the sensitive tips of the individual wires 6 of the stranded wire end 5, thus significantly minimizing the risk of breakage and, as a result, improper contact. Contacting the sleeve 12 with the stranded wire end 5 is preferably achieved by crimping. Alternatively, the sleeve 12, together with the stranded wire end 5, can be dipped into a tin bath for contacting.

[0045] Figure 5 shows two alternative embodiments of the stranded wire winding 1 according to the invention. It can be clearly seen that the stranded wire ends 5 are distributed over approximately a quarter of the circumference of the stranded wire winding 1. As the two images in Figure 5 show, the orientation of the stranded wire ends 5 can vary. The orientation is essentially defined by the orientation of the first and second widths 13, 14 of the sleeve 12 relative to the respective radial direction 19 of the stranded wire winding 1. The orientation and arrangement of the stranded wire ends 5 and the sleeve 12 are preferably coordinated with the arrangement and orientation of the recesses 11 of the carrier plate 2, see Figure 6.

[0046] Figure 6 shows two preferred embodiments of the carrier plate 2 for the method according to the invention. The right-hand illustration in Figure 6 shows recesses 11 which are designed as through-holes. In a particularly preferred embodiment of the carrier plate 2, the recesses 11 are designed to be open towards the outer surface 10, as the left-hand illustration in Figure 6 shows. The edges of the recesses 11 are preferably rounded towards the outer surface 10 in order to facilitate the insertion of the sleeves 12 into the recesses 11 during assembly. Regardless of the design of the recesses 11, the recesses 11 have a first width 16 and a second width 17.

[0047] Figure 7 shows the carrier plate 2 after the sleeve 12 has been inserted into the recesses 11. The recesses 11 are particularly preferably designed as elongated holes 20 which are open towards the outer surface 10 of the carrier plate 2, wherein the alignment of the longitudinal axis 25 of the elongated holes 20 in the radial direction to the circle center 21 of the second end face 9 has an angle 23, wherein this angle is 30°-60° and preferably 40°-50°. Advantageously, for the method according to the invention, the sleeves 12 are aligned according to the position of the elongated holes 20. The second width 14 of the sleeves 12 and the first width 16 of the recesses 11 are matched to one another not only in terms of size, but also in their orientation.The first width 13 of the sleeve 12 extends in the direction of the longitudinal axis 25 of the elongated hole 20, wherein the first width 13 of the sleeve 12 and the second width 17 of the elongated hole 20 are coordinated with one another in such a way that the sleeve 12 can be inserted almost completely into the elongated hole.

[0048] According to a particularly advantageous embodiment of the method according to the invention, the sleeves 12 and the elongated holes 20 are positioned at the same height and adjacent to one another in the axial direction 18 of the stranded wire winding, and the stranded wire winding 1 and the carrier plate 2 are aligned coaxially with one another. In doing so, the stranded wire ends 5 are bent slightly radially outwards. Advantageously, the stranded wire ends 5 are sufficiently long so that a slight bending of the stranded wire ends 5 does not lead to a breakage of individual wires 6 or even to the breakage of the stranded wire end 5. The sleeves 12 are then moved radially inwards and thereby inserted into the elongated holes 20. Preferably, a rotational movement of the carrier plate 2 relative to the stranded wire winding 1 occurs at the same time. This has the advantage that inserting the sleeves 12 into the elongated holes 20 is simplified during assembly.It is advantageous if the side surfaces of the sleeves 12 are rounded.

[0049] According to a further preferred embodiment of the present method, the sleeve 12 is soldered to the carrier plate 2 after being inserted into the recess 11 of the carrier plate 2. Soldering offers the advantage of extremely robust electrical contact and eliminates the need for additional clamping mechanisms.

[0050] List of reference symbols:

[0051] 1 winding / stranded wire winding

[0052] 2 carrier plate

[0053] 3 first axial end

[0054] 4 second axial end

[0055] 5 stranded wire ends

[0056] 6 single wires

[0057] 7 Axis of the winding

[0058] 8 first front side 9 second front side

[0059] 10 Shell surface

[0060] 11 recesses

[0061] 12 sleeve

[0062] 13 first width of the sleeve

[0063] 14 second width of the sleeve

[0064] 15 Depth of the recess

[0065] 16 first width of the recess

[0066] 17 second width of the recess

[0067] 18 axial direction of the stranded wire winding

[0068] 19 radial direction of the stranded wire winding

[0069] 20 slotted holes

[0070] 21 Center of the circular front side

[0071] 22 case blank

[0072] 23 angles

[0073] 24 Longitudinal axis of the carrier plate

[0074] 25 Longitudinal axis of the slot

Claims

Claims 1. A method for contacting a winding (1) with a carrier plate (2), wherein the winding (1) has a first axial end (3) and an opposite second axial end (4), and wherein the winding (1) comprises at least two stranded wire ends (5) for electrical connection to the carrier plate (2), and wherein the stranded wire ends (5) protrude beyond an axial end (3), (4) of the winding (1), are aligned substantially parallel to the axis (7) of the winding (1), and are distributed over at least a partial circumference of the winding (1), and wherein the carrier plate (2) has a first end face (8) facing the stranded wire ends (5) and a second end face (9) facing away from the stranded wire ends (5), as well as a lateral surface (10), and wherein the first end face (8) has recesses (11) for receiving the stranded wire ends (5), comprising the following method steps: - bringing together the stranded wire end (5) and a sleeve (12) so that the sleeve (12) surrounds the stranded wire end (5) at least in sections over at least part of its length, - Electrical contact of the stranded wire end (5) with the sleeve (12), - Inserting the stranded wire end (5) equipped with the sleeve (12) into the recess (11) of the carrier plate (2), characterized in that the winding (1) is a stranded wire winding (1) and the stranded wire ends (5) have insulated individual wires (6) and the insulation comprises a high-temperature-resistant varnish, wherein after inserting the stranded wire end (5) equipped with the sleeve (12) into the recess (11) of the carrier plate (2), the stranded wire ends (5) remain aligned substantially parallel to the axis (7) of the winding (1) and the sleeve (12) and the carrier plate (2) are electrically contacted with one another.

2. Method according to claim 1, characterized in that the sleeve (12) is designed as a closed sleeve (12) and, in order to bring the sleeve (12) and the stranded wire end (5) together, the sleeve (12) is pushed over the stranded wire end (5) and the stranded wire end (5) is completely radially enclosed over at least part of its length range.

3. Method according to claim 1, characterized in that the sleeve (12) is designed as a sleeve blank (22) when brought together with the stranded wire end (5) which is brought into the shape of a sleeve (12) by forming and thus completely radially encloses the stranded wire end (5) over at least part of its length range.

4. Method according to one of claims 1 to 3, characterized in that the sleeve (12) is open on both sides in the axial direction, so that when the stranded wire end (5) is electrically contacted with the sleeve (12), insulating varnish can escape on both sides.

5. Method according to one of claims 1 to 4, characterized in that the sleeve (12) is contacted by crimping and preferably by hot crimping with the individual wires (6) of the stranded wire end (5) lying on the inner circumference.

6. Method according to claim 5, characterized in that for hot crimping the area of ​​the stranded wire end (5) enclosed by the sleeve (12) is heated to 500 °C to 900 °C and preferably to 750 °C, whereby the insulating varnish of the individual wires (6) of the stranded wire end (5) is melted away.

7. Method according to one of claims 1 to 6, characterized in that the sleeve (12) has a first width (13) and a second width (14), wherein the first and the second width (13), (14) are aligned orthogonally to the longitudinal axis of the stranded wire end (5) and wherein after contacting the sleeve (12) with the stranded wire end (5), the first width (13) of the sleeve (12) has a spatial extent that is at least twice as high and preferably at least four times as high as the second width (14) of the sleeve (12).

8. Method according to one of claims 1 to 7, characterized in that for contacting the stranded wire end (5) and the sleeve (12) are immersed in a tin bath for such a long time that the insulation of the stranded wire end (5) is melted.

9. Method according to one of claims 1 to 8, characterized in that the recess (11) of the first end face (8) of the carrier plate (2) has a depth (15) which extends orthogonally from the first end face (8) in the direction of the second end face (9), and in that the recess (11) has a first width (16) and a second width (17), wherein the first width (16) and the second width (17) are aligned at a right angle to one another, and wherein the sleeve (12) is contacted with the carrier plate (2) in such a way that at least one width (13), (14) of the sleeve (12) can be brought together with at least one width (16), (17) of the recess (11) of the first end face (8) in such a way that there is a play of at least 0.1 mm, preferably of at least 1 mm and more preferably of at least 2 mm.

10. Method according to one of claims 1 to 9, characterized in that the recesses (11) on the first end face (8) of the carrier plate (2) are continuous to the second End face (9) and are open towards the lateral surface (10), wherein the carrier plate (2) and the stranded wire winding (1) are aligned with one another in such a way that the axis (7) of the stranded wire winding (1) and the longitudinal axis (24) of the carrier plate (2), which runs orthogonal to the first end face (8) of the carrier plate (2), run parallel to one another and wherein the carrier plate (2) and the stranded wire winding (1) are aligned with one another in the axial direction (18) in such a way that the sleeve (12) is introduced into the recess (11) by radially displacing the carrier plate (2) or by radially displacing the stranded wire winding (1) or by radially displacing the sleeve (12).

11. The method according to claim 10, characterized in that the recess (11) is designed as an elongated hole (20) which is open towards the outer surface (10) of the carrier plate (2), wherein the alignment of the longitudinal axis (25) of the elongated hole (20) in the radial direction to the circle center (21) of the end face (8), (9) has an angle (23), wherein this angle (23) is 30°-60° and preferably 40°-50° and wherein the sleeve (12) is inserted into the elongated hole (20) of the carrier plate (2) by radial displacement and the displacement is superimposed by an additional rotary movement about the axis (7) of the stranded wire winding (1) or about the center point (21) of the circular end face (8), (9).

12. Method according to one of claims 1 to 11, characterized in that following the insertion of the sleeve (12) into the recess (11) of the carrier plate (2), the sleeve (12) is soldered to make contact with the carrier plate (2).

13. Stranded wire winding (1) produced by a method according to one of claims 1 to 12.

14. Stranded wire winding (1) according to claim 13, characterized in that one stranded wire end (5) comprises at least five individual wires (6) and preferably at least fifteen individual wires (6).

15. Stranded wire winding (1) according to one of claims 12 to 14, characterized in that the stranded wire ends (5) are arranged over a circumferential section of at most 180° and preferably over a circumferential section of at most 150° of the stranded wire winding (1).

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