DE102016114723A1 - Electrical, substantially annular connection device for a stator of an electric motor and electric motor - Google Patents

Abstract

The present invention relates to an electrical, substantially annular connecting device (1) for a stator of an electric motor with retracted round wire winding, comprising: an electrically insulating bottom ring (10); an overlying electrically conductive star ring (30) having a plurality of radially outwardly extending outer terminal contacts (32); three identical pairs, each having a lower, electrically insulating intermediate ring (50) and an overlying upper electrically conductive connection ring (70) with radially outwardly extending outer terminal contacts (72) and with a radially inner side thereof in the axial direction upwardly extending upper terminal contact; and a substantially annular cover covering the upper terminal ring (70) from which the three upper terminal contacts of the electrically conductive terminal rings (70) project upwardly and which covers the outer terminal contacts (32, 72) radially outwardly; wherein the three pairs of electrically insulating intermediate rings (50) and electrically conductive connecting rings (70) are circumferentially offset from each other so that their outer terminal contacts (72) respectively at circumferentially spaced apart terminal positions and that their upper terminal contacts to each other in Circumferentially spaced contact positions lie.

Description

The present invention relates to an electrical, substantially annular connection device for a stator of an electric motor with retracted round wire winding and an electric motor with retracted round wire winding with such an electrical connection device.

From the DE 10 2009 020 610 A1 a method for simplified production of an electric motor is known, in which the coils of a stator are wound such that their electrical connections leave the stator at predefined locations of a stator slot, a switching spider having at least three switching rings and a plurality of terminal lugs arranged on the respective switching rings on the stator is positioned, wherein the terminal lugs of the switching rings are aligned with the terminals of the stator or vice versa, a preferably automated connection of the terminals with the terminal lugs, in particular a welding, is made for electrical contacting.

Such a switching spider has a complex structure and is correspondingly expensive to manufacture and to assemble. In addition, the switching spider requires that the electrical connections leave the stator at predefined locations of a stator slot, which limits the use of the switching spider to exactly such stators. In addition, in such a switching spider often results in the problem of short circuits or unwanted electrical contact with the terminal lugs.

It is therefore an object of the present invention to provide an electrical connection device for a stator of an electric motor, which can be used for any stators, in which there is a reliable electrical connection to the stator and which can be easily manufactured and mounted and easily disassembled ,

This object is solved by the subject matter of the independent patent claims. Advantageous developments emerge from the dependent claims.

An electrical, substantially annular connection device according to the invention for a stator of an electric motor with retracted round wire winding comprises: an electrically insulating bottom ring; an overlying electrically conductive star ring having a plurality of radially outwardly extending outer terminal contacts; three identical pairs, each comprising a lower, electrically insulating intermediate ring and an upper, electrically conductive connection ring resting thereon, with radially outwardly extending, outer connection contacts and with an upwardly extending from the radial inner side in the axial direction, upper connection contact; and a substantially annular cover covering the upper terminal ring from which the three upper terminal contacts of the electrically conductive terminal rings protrude upward and which covers the outer terminal contacts radially outwardly; wherein the three pairs of electrically insulating intermediate rings and of electrically conductive connection rings are circumferentially offset from one another in such a way that their outer terminal contacts each lie at mutually circumferentially spaced terminal positions and their upper terminal contacts are spaced from each other in the circumferential direction of contact positions.

The connecting device according to the invention has the advantage that it is composed of a few different components, namely an electrically insulating bottom ring, an electrically conductive star ring, three identical electrically conductive connection rings, three identical electrically insulating intermediate rings and a cover. The production is thereby simplified and it can be produced at low production costs in large quantities.

The connecting device according to the invention can be assembled in a simple manner, with few steps to be executed and without assembly tools. The connecting device according to the invention is not only easy and quick to assemble, but it can also be disassembled again with little effort, which is advantageous in terms of recycling-friendly product design. The individual components of the connection device come in mounting form fit against each other to concern, and support each other. On fasteners, such. As glands, adhesions or pouring into an epoxy resin, can be dispensed with.

After welding, the entire electric motor can be impregnated for safety.

The connecting device according to the invention can be used in any stators of electric motors. The corresponding terminals of the stator are simply connected to the respective outer terminal contacts of the electrically conductive star ring and the electrically conductive connection rings. A special alignment or adjustment of the stator to the electrical connection device deleted.

In the connection of the terminals of the stator to the outer terminal contacts of the electrically conductive star ring and the electrically conductive Connecting rings, the cover is simply removed or not yet put on. Only after the connection has been completed is the cover put on. This simplifies the electrical connection of the connecting device according to the invention.

Through the cover, the outer terminal contacts of the electrically conductive star ring and the electrically conductive connection rings, the coil lead wires of the electric motor and their connections are protected both upward and radially outward against mechanical influences and inadvertent contact and especially against short circuits. Within the annular cover is enough space for receiving the to be contacted with the terminals coil lead wires of the electric motor. The coil lead wires extend from below into the gap between the bottom ring and this spaced radially outwardly enclosing cover.

Characterized in that the three pairs of electrically insulating intermediate rings and electrically conductive connection rings are arranged offset in the circumferential direction to each other, that their outer terminal contacts are spaced from each other in the circumferential direction terminal positions, a good circumferential distribution of the coil lead wires is ensured and an unwanted contact between coil lead wires adjacent connection contacts avoided.

The number of external connection contacts of the electrically conductive star ring and the electrically conductive connection rings results from the winding topology of the stator of the electric motor.

For example, if there are twelve coils in the stator of the electric motor, each divided into the three phases, four coils will result per phase. Each coil departure begins at a departure of the phases. The ends of the respective coils are connected to the electrically conductive star ring and to the respective electrically conductive connection ring of the respective phase. With twelve coils, divided over the three phases, there are thus twelve outer connection contacts for the electrically conductive star ring and four outer connection contacts for each of the electrically conductive connection rings, each of which is provided for each of the three phases.

The number of external connection contacts for the electrically conductive star ring and for the electrically conductive connection rings can be higher if more coils are provided in the stator of the electric motor.

According to a first embodiment, the electrically insulating intermediate rings each have substantially the shape of an annular groove, with an intermediate ring bottom region, with an outer wall region which adjoins the outer circumference of the intermediate ring bottom region and upwardly, and with one on the inner circumference of the Intermediate ring floor area starting, and upwardly extending inner wall area.

Through this channel shape of the electrically insulating intermediate rings, it is possible that the electrically conductive connection rings come to rest in the channel. In this case, then lies an electrically conductive connection ring on the intermediate ring bottom region of the electrically insulating intermediate ring and is at least partially bordered radially outwardly through the outer wall region and radially inwardly through the inner wall region. This results in a centering and fixing of the electrically conductive connection ring on the electrically insulating intermediate ring. The electrically conductive connection ring is electrically insulated both downwardly and radially outwardly and radially inwardly from the electrically insulating intermediate ring. Furthermore, the pair of electrically insulating intermediate ring and arranged thereon electrically conductive connection ring also has a low overall height. The height of the intermediate ring bottom region corresponds to the dimension in the axial direction between the underside of the intermediate ring and the intermediate ring bottom region, on which the electrically conductive connection ring rests.

According to a further embodiment, outer terminal contact recesses are provided at circumferential positions in the outer wall area, which correspond to the angular positions of the radially outwardly extending outer terminal contacts of the electrically conductive terminal ring placed on the intermediate ring floor area.

The outer terminal contacts extend through the outer terminal contact recesses, whereby the electrically conductive terminal ring is set in terms of its angular position in the circumferential direction to the electrically conductive connection ring. As a result, a positional fixing of the electrically insulating intermediate ring placed on the electrically conductive connection ring is achieved in a very simple positive manner.

According to one embodiment, an inner terminal contact recess is provided in the inner wall portion at a circumferential position coincident with the angular position of the axially upwardly extending upper terminal of the intermediate ring bottom portion applied, electrically conductive connection ring corresponds.

The inner terminal contact recess allows passage of a transition region of the electrically conductive terminal ring, which is then bent upwards as the upper terminal contact.

According to a further embodiment, the axially extending upward, upper terminal contact of each electrically conductive connection ring on the inner peripheral portion of the terminal ring attaching and upwardly bent transition region and an attaching thereto, in the axial direction upwardly ersteckenden flat connection area.

The flat connection area makes it easy to contact the electrically conductive connection ring. At the same time, the bent transition region allows a displacement of the flat connection region radially inwards with respect to the connection ring, so that an engagement of an intermediate ring on the connection ring is not hindered.

According to one embodiment, the electrically insulating bottom ring has radially outer wall portions with interruptions through which the outer terminal contacts of the star ring and each electrically conductive terminal ring extend outwardly.

The electrically insulating bottom ring holds with the radially outer edge portions of the packet of star ring with the arranged thereon pairs of electrically insulating intermediate ring and resting thereon electrically conductive connection ring radially centered one above the other lying together. At the same time, the outer connection contacts of the star ring and the electrically conductive connection rings can protrude radially out of the bottom ring through the interruptions and be contacted there.

According to a further embodiment, the radially outer wall portions and the interruptions are formed so that they define the contact positions in the circumferential direction for the outer terminal contacts of the electrically conductive star ring and the three electrically conductive connection rings.

As a result, the connection contacts can protrude from one another at a distance from the bottom ring, which is advantageous for their contacting.

According to one embodiment, in the radially outer wall portions of the bottom ring, interruptions are formed as star ring terminal contacts interruptions extending from the upper wall end of the respective radially outer wall portion to a lower height level substantially at the level of the bottom ring bottom portion. wherein the number of star ring terminal contact breaks corresponds to the number of radially outwardly extending outer terminal contacts of the electrically conductive star ring. The star ring terminal contact breaks are provided at circumferential positions corresponding to the angular positions of the radially outwardly extending outer terminal contacts of the electrically conductive star ring placed on the bottom ring bottom portion. Under bottom ring floor area here is the trough and ring-shaped bearing surface of the bottom ring understood on which the electrically conductive star ring rests.

The star ring connector breaks establish the angular positions in the circumferential direction for the outer terminals of the electrically conductive star ring. Due to the fact that the star ring connection contact interruptions extend down to the bottom ring bottom area, the star ring, which has a planar design and is particularly flat, can rest flat on the bottom ring bottom area.

According to a further embodiment, in the radially outer wall portions, interruptions are formed as first terminal-ring terminal interruptions extending from the upper wall end to a lower height level substantially at a height around the height of the star ring and around the star ring Height of the intermediate ring bottom portion of an electrically insulating intermediate ring is above the bottom ring bottom portion; wherein the number of the first terminal ring terminal interruptions corresponds to the number of radially outwardly extending, outer terminal contacts of the first electrically conductive terminal ring. For example, the first terminal ring terminal breaks are provided at circumferential positions corresponding to the angular positions of the radially outwardly extending outer terminal contacts of the first electrically conductive terminal ring placed on the first intermediate ring.

According to a further embodiment, in the radially outer wall portions, interruptions are formed as second terminal ring terminal contacts interruptions extending from the upper wall end to a lower height level substantially at a height that is around the height of the star ring Height of the intermediate ring bottom portion of the first electrically insulating intermediate ring to the height of the first electrically conductive connection ring and the height of the intermediate ring bottom portion of the second electrically insulating intermediate ring is above the bottom ring bottom region; wherein the number of the second terminal ring terminal interruptions corresponds to the number of radially outwardly extending outer terminal contacts of the second electrically conductive terminal ring. For example, the second terminal ring terminal breaks are provided at circumferential positions corresponding to the angular positions of the radially outwardly extending outer terminal contacts of the second electrically conductive terminal ring placed on the second intermediate ring.

According to a further embodiment, in the radially outer wall sections, interruptions are formed as third terminal ring terminal junctions extending from the upper wall end to a lower height level that is substantially at a height that is about the height of the star ring Height of the intermediate ring bottom portion of the first electrically insulating intermediate ring, the height of the first electrically conductive connection ring, the height of the intermediate ring bottom portion of the second electrically insulating intermediate ring, the height of the second electrically conductive connection ring, and the height of the intermediate ring bottom portion the third electrically insulating intermediate ring is above the bottom ring bottom region; wherein the number of the second terminal ring terminal interruptions corresponds to the number of radially outwardly extending outer terminal contacts of the third electrically conductive terminal ring. For example, the third terminal ring terminal breaks are provided at circumferential positions corresponding to the angular positions of the radially outwardly extending outer terminal contacts of the third electrically conductive terminal ring placed on the third intermediate ring.

The lower ends of the first terminal ring terminal contact interruptions lie at a height, measured from the bottom ring bottom area, in which the underside of the outer terminal contacts of the bottom, electrically insulating intermediate ring is located. This is implemented analogously for the second and third pair of electrically insulating intermediate ring and the electrically conductive connection ring lying thereon.

This has the advantage that it is noticed in the assembly, when the respective outer terminal contacts of an electrically conductive connection ring are arranged at the wrong height position, for. B. if an electrically insulating intermediate ring is forgotten or if an electrically conductive connection ring is inserted in the wrong circumferential position. By this type of "shape coding" the angular positions of the outer terminal contacts for the individual pairs of electrically insulating intermediate ring and the resting thereon electrically conductive connection ring in the circumferential direction of the bottom ring set and reliably prevents errors during assembly.

According to a further embodiment, a connection ring connection contact interruption is arranged in each case between two star ring connection contact interruptions.

This is followed in the circumferential direction in the assembled state successively an outer terminal contact of a terminal ring and an outer terminal contact of the star ring. With three connection rings, one for each phase of the electric motor, each with four outer terminals, there are 12 outer connection contacts for the three connection rings, four each for a connection ring, and 12 outer connection contacts for the star ring. There are thus 24 outer terminals arranged around the circumference of the bottom ring around. The spaced-apart arrangement of the outer terminal contact of the star ring and the outer terminal contact of the terminal ring avoids that terminal contacts can be arranged directly above one another. Furthermore, this construction is particularly compact and space-saving.

According to a further embodiment, the terminal ring terminal interruptions are arranged in the circumferential direction one after another such that the respective second terminal ring terminal interruption is arranged between a first terminal ring terminal break and a third terminal ring terminal break.

As a result, the outer terminal contacts of the connecting rings are arranged ascending in height, which is particularly advantageous in terms of electrical connectivity.

According to a further embodiment, each electrically conductive connection ring has four outer connection contacts and the electrically conductive star ring has twelve outer connection contacts.

According to a further embodiment, the outer terminal contacts are each formed fork-shaped or claw-shaped. The leads of the coils of the stator of the electric motor can thus be taken within the respective forked or claw-shaped terminal, soldered thereto and, if necessary, be pinched off. Overall, this results in a secure mechanical and electrical connection between the supply line and terminal contact.

According to a further embodiment, the annular cover has an annular cover portion lying substantially in a radial plane and a cylindrical cover outer wall portion.

According to a further embodiment, between the inside of the cylindrical cover outer wall portion on the one hand and the radially outer wall portions with the interruptions of the electrically insulating bottom ring on the other hand, an annular connection gap, d. H. an annular gap, formed for the connection of the wires of the stator of the electric motor to the outer terminal contacts of the electrically conductive connection ring and the electrically conductive star ring.

In the annular connection gap, the leads of the stator and in particular the connection contacts are protected upwards and radially outward against mechanical influences and against unintentional contact and especially against short circuits.

According to a further embodiment, latching lugs for latching with one or more latching elements, which are arranged on the annular cover, are provided on the radially outer wall sections of the electrically insulating bottom ring.

As a result, a simple and releasable attachment of the cover to the bottom ring is realized. On the bottom ring also recesses may be provided, engage in the locking lugs, which are provided on the cover, for locking.

According to a further embodiment, the inner circumferential wall of the electrically insulating bottom ring has three recesses formed radially inwardly with respect to the jacket surface of the inner peripheral wall for receiving the three upper connecting contacts of the three connecting rings extending upwardly in the axial direction; wherein the first indentation extends from the upper wall end of the inner peripheral wall to a first lower height level that is substantially at a height that exceeds the height of the star ring and the height of the intermediate ring bottom portion of the first electrically insulating intermediate ring the bottom ring floor area is located; wherein the second indentation extends from the upper wall end to a second lower height level that is substantially at a height that is about the height of the star ring, about the height of the intermediate ring bottom portion of the first electrically insulating intermediate ring, about the height of the first electrically conductive terminal ring, and is about the height of the intermediate ring bottom portion of the second electrically insulating intermediate ring over the bottom ring bottom portion; and wherein the third recess extends from the upper wall end to a third lower height level substantially at a height that is about the height of the star ring, about the height of the intermediate ring bottom portion of the first electrically insulating intermediate ring, about the height of the star ring first electrically conductive terminal ring, around the height of the intermediate ring bottom portion of the second electrically insulating intermediate ring, around the height of the second electrically conductive terminal ring, and around the height of the intermediate ring bottom portion of the third electrically insulating intermediate ring over the bottom ring bottom portion.

The recesses provide space for the respective, upwardly extending terminal contacts. As a result, the bottom ring can be designed as a whole in a slim and material-saving manner in the radial direction. Further, the indentations may allow support of the upwardly extending terminal contacts on the bottom ring in the circumferential direction of the bottom ring and may also serve for alignment or positioning of the connection rings in their circumferential direction. By this type of "shape coding" the angular positions of the upwardly extending terminal contacts for the individual pairs of electrically insulating intermediate ring and the resting thereon electrically conductive connection ring in the circumferential direction of the bottom ring set and errors in assembly reliably avoided.

According to a further embodiment, the order of the indentations along the circumference of the electrically insulating bottom ring is first indentation, followed by second indentation, followed by third indentation.

According to a further embodiment, three through-holes are formed in the cover ring region of the annular cover for the three axially upwardly extending upper connection contacts of the three connection rings, in particular in radially inwardly widened cover ring region sections. For example, the three through holes in the cover ring portion of the annular cover are aligned with the three recesses, and the three axially extending upper terminal contacts of the three terminal rings lie in the three recesses and protrude upward through the three through holes.

In this embodiment, the angular position in which the cover on the electrically insulating bottom ring with the electrically conductive star ring and the three pairs of electrically insulating intermediate ring and electrically conductive Connecting ring is attached, set. A wrong positioning is thus reliably excluded. In this embodiment, the interior of the connection device, the connection contacts and the upper electrically conductive connection ring is covered, only the upper connection contacts are up out. Accidental contacting of the upper connection ring during assembly or operation is reliably avoided. Furthermore, it is avoided that impurities can get into the connection device.

According to a further embodiment, one or more webs are formed projecting downwardly from the underside of the annular cover portion of the cover for engagement in corresponding fixing or locking elements of the electrically insulating bottom ring.

According to a further embodiment, first latching elements, in particular latching noses or recesses, are provided for latching to the bottom ring on the webs; and / or on the outer circumference of the bottom ring second latching elements, in particular latching noses or depressions, for latching with the cover, in particular the webs provided.

The webs are thus shielded to the outside and thus protected from damage and contamination. Furthermore, the webs allow elastic compression at their free ends. The webs can surround the bottom ring radially and thus center the cover and the bottom ring to each other. A latching creates an easily produced and detachable connection between bottom ring and cover. The solubility of the compound is advantageous for recycling-friendly product design.

According to a further embodiment, a substantially vertically extending web is provided on the inner peripheral wall of the bottom ring. The web, for example, starting from the inner circumferential wall tapers, in particular wedge-shaped, tapered executed.

The invention also relates to an electric motor with retracted round wire winding, in particular a three-phase motor with star-delta start-up circuit, with an electrical connection device of the type described here.

According to one embodiment, the outer terminal contacts of the electrically conductive terminal ring and the outer terminal contacts of the electrically conductive star ring are connected by resistance welding connections with electrical leads of the stator of the electric motor.

The resistance welded joints provide a durable, quick-to-install connection between the terminals and the electrical leads.

According to a further embodiment, the supply lines have insulation up to a position in front of the resistance welding connections.

In the field of resistance welding connections, the insulation has been removed, for example, thermally by the high temperature and also the pressing in the resistance welding process. As a result, the insulation is very close to the weld and an additional stripping step is eliminated.

The ends of the coils of the stator of the electric motor are advantageously connected to the electrically conductive star ring and to the respective electrically conductive connection ring of the respective phase.

The invention will be explained in more detail below with reference to embodiments with reference to the accompanying figures.

1 shows an electrical, substantially annular connecting device for a stator of an electric motor with retracted Rundradwicklung according to an embodiment in a perspective view;

2 shows the bottom ring of the connection device 1 in a perspective view;

3 shows the star ring of the electrical connection device according to the embodiment of 1 in a perspective view;

4 shows an electrically insulating intermediate ring of the connecting device according to the embodiment of 1 in a perspective view;

5 shows an electrically conductive connection ring of the connection device according to the embodiment of 1 in a perspective view;

6 shows an annular cover of the connecting device according to embodiment of 1 in a perspective view;

7 shows the cover of the connecting device according to the embodiment of 1 with upwardly projecting upper terminal contacts in a perspective view;

8th shows the cover of the connecting device according to the embodiment of 1 in a sectional view; and

9 shows the connection device according to the embodiment of 1 seen from below.

In the figures, the same reference numerals designate the same or functionally identical components, unless indicated otherwise.

1 shows an electrical, substantially annular, connecting device 1 for a stator 2 (in 1 not shown) of an electric motor 4 (in 1 not shown) with retracted round wire winding according to an embodiment in a perspective view. The structure is described starting from the bottom. At the bottom of the picture is an electrically insulating bottom ring 10 on the a starring 30 with a plurality of radially outwardly extending outer terminal contacts 32 rests. On the star ring 30 are three identical pairs, each having a lower, electrically insulating intermediate ring 50 and an overlying upper electrically conductive connection ring 70 , on. The top of the three connection rings is clearly visible in the picture 70 located on an annular intermediate ring bottom region of the electrically insulating intermediate ring 50 rests. The electrically insulating intermediate ring 50 has to accommodate the connection ring 70 a trough-shaped figure. The three connection rings 70 each have four outwardly extending outer terminal contacts 72 on, which are designed claw-shaped and of the respective electrically conductive connection ring 70 extend radially outward. Each of the electrically conductive connection rings 70 has an upper terminal contact extending upwardly from its radially inner side in the axial direction 74 on. The upper connection contact 74 of the top of the three connection rings 70 is best recognized. The connection contacts 74 are in this embodiment up from the flat extent of the respective connection ring 70 bent. The connection device 1 also has a cover 90 (in 1 not shown), the upper connecting ring 70 covering, from which the three upper connection contacts 74 the electrically conductive connection rings 70 stand out at the top and the outer terminals 32 . 72 covering radially outwards.

The picture clearly shows that the three pairs of electrically insulating intermediate rings 50 and of electrically conductive connection rings 70 are arranged offset to one another in the circumferential direction, that their outer terminal contacts 72 lie respectively at mutually circumferentially spaced terminal positions and that their upper terminal contacts 74 lie at spaced from each other in the circumferential direction contact positions. The external connection contacts 72 the three connection rings 70 are each at different altitude levels. At the bottom are the twelve outer contacts 32 of the electrically conductive star ring 30 arranged. One level higher, there are four outer terminals 72 the lowest of the three electrically conductive connection rings 70 , One level higher are the four outer contacts 72 the middle of the three electrically conductive connection rings 70 and at the top are the four connection contacts 72 of the top connecting ring 70 ,

Below are the individual components of the connection device 1 described in detail with reference to several other figures. For the overall structure reference is made locally 1 taken.

2 shows the bottom ring 10 the connection device 1 out 1 in a perspective view. Evident are radially outer wall sections 12 with innterruptions 14 in which, in the assembled state of the connection device, the outer connection contacts 32 . 72 of the star ring 30 and each electrically conductive connection ring 70 outward from the bottom ring 10 extend out. In the radially outer wall sections 12 are starring terminal contact breaks 16 formed from the upper wall end of the respective radially outer wall portion 12 extend to a lower height level substantially at the level of a bottom ring floor area 18 of the bottom ring 10 lies. Under bottom ring floor area 18 Here is the trough and annular bearing surface of the bottom ring 10 understood, on which the electrically conductive star ring rests. Due to the star ring connection contact interruptions 16 protrude in the assembled state of the connection device 1 the external connection contacts 32 of the star ring 30 therethrough. The star ring connection contact breaks 16 correspond in number to the external connection contacts 32 of the star ring 30 Therefore, in this embodiment, there are twelve star ring terminal contact breaks 16 intended.

In the radially outer wall sections 12 of the bottom ring continue to be first terminal ring terminal interruptions 20 formed extending from the upper wall end to a lower height level, which is substantially at a height which is around the height of the star ring 30 and the height of an intermediate ring floor area 52 an electrically insulating intermediate ring 50 above the bottom ring ground area 18 lies. The number of first terminal ring terminal breaks 20 corresponds to the number of radially outwardly extending outer terminal contacts 72 of the first electrically conductive connection ring 70 out 1 , Thus, in this embodiment, there are four first terminal ring terminal contact breaks 20 intended. The first connection ring connection break 20 are provided at circumferential positions with the angular positions of the radially outwardly extending, outer terminal contacts 72 of the first intermediate ring 50 placed first electrically conductive connection ring 70 correspond.

In the radially outer wall sections 12 of the bottom ring 10 are also second terminal ring terminal contact breaks 22 formed extending from the upper wall end to a lower height level, which is substantially at a height which is around the height of the star ring 30 to the height of the intermediate ring floor area 18 of the first electrically insulating intermediate ring 50 to the height of the first conductive connection ring 70 , and about the height of the intermediate ring floor area 52 of the second electrically insulating intermediate ring 50 Above the bottom ring floor area 18 lies. In this embodiment, four second terminal ring terminal contacts are interrupts 22 , corresponding to the number of radially outwardly extending outer terminal contacts 72 of the second electrical conductive terminal ring 70 educated. The second terminal ring connection break 22 are provided at circumferential positions corresponding to the angular positions of the radially outwardly extending outer terminal contacts 72 on the second intermediate ring 50 launched second electrically conductive connection ring 70 correspond.

In the radially outer wall sections 12 of the bottom ring 10 Further, third terminal ring terminal contact breaks are 24 formed from the upper wall end of the radially outer wall portion 12 extend to a lower height level that is substantially at a height that is about the height of the star ring, about the height of the intermediate ring bottom area 52 of the first electrically insulating intermediate ring 50 to the height of the first electrically conductive connection ring 70 to the height of the intermediate ring floor area 52 of the second electrically insulating intermediate ring 50 to the height of the second electrically conductive connection ring 70 , and about the height of the intermediate ring floor area 52 of the third electrically insulating intermediate ring 50 above the bottom ring ground area 18 lies. The number of third terminal ring terminal breaks 24 corresponds to the number of radially outwardly extending outer terminal contacts 72 of the third electrically conductive connection ring 70 , Thus, in this embodiment, there are four third terminal ring terminal contact breaks 24 intended. The third terminal ring connection break 24 are provided at circumferential positions corresponding to the angular positions of the radially outwardly extending outer terminal contacts 72 of the third intermediate ring 50 launched third electrically conductive connection ring 70 correspond.

In this embodiment, there is between two star ring terminal contact breaks 16 one terminal ring contact break each 20 . 22 . 24 intended.

In this embodiment, the terminal ring terminal contacts are interrupts 20 . 22 . 24 arranged one after the other in the circumferential direction in such a way that the respectively second connection ring connection contact interruption 22 between a first terminal ring terminal break 20 and a third terminal ring terminal break 24 is arranged.

In this embodiment, two of the radially outer wall sections 12 of the electrically insulating bottom ring 10 locking lugs 26 for latching with one or more locking elements 98 (in 2 not shown) attached to the annular cover 90 are arranged provided. The locking lugs 26 have in this embodiment, a wedge shape, which is oriented so that it upwards radially inwardly on the bottom ring 10 runs.

The bottom ring 10 becomes radially inward through an inner circumferential wall 28 limited. On the inner peripheral wall 28 are three radially inwardly molded indentations 29a . 29b . 29c for receiving the three upwardly extending in the axial direction, upper terminal contacts 74 the three connection rings 70 intended.

The first indentation 29a extends from the upper wall end of the inner peripheral wall 28 to a first lower height level that is substantially at a height that is about the height of the star ring 30 and around the height of the intermediate ring floor area 52 of first electrically insulating intermediate ring 50 above the bottom ring ground area 18 lies.

The second indentation 29b extends from the upper wall end of the inner peripheral wall 28 to a second lower height level that is substantially at a height that is about the height of the star ring 30 to the height of the intermediate ring floor area 52 of the first electrically insulating intermediate ring 50 to the height of the first electrically conductive connection ring 70 , and about the height of the intermediate ring floor area 52 of the second electrically insulating intermediate ring 50 above the bottom ring ground area 18 lies.

The third indentation 29c extends from the upper wall end of the inner peripheral wall 28 to a third lower height level that is substantially at a height that is about the height of the star ring 30 to the height of the intermediate ring floor area 52 of the first electrically insulating intermediate ring 50 to the height of the first electrically conductive connection ring 70 to the height of the intermediate ring floor area 52 of the second electrically insulating intermediate ring 50 to the height of the second electrically conductive connection ring 70 , and about the height of the intermediate ring floor area 52 of the third electrically insulating intermediate ring 50 above the bottom ring ground area 18 lies.

On the inner peripheral wall 28 of the bottom ring 10 is a substantially vertically extending web 27 provided, starting from the inner peripheral wall 28 is wedge-shaped tapered running. The jetty 27 is recognizable in the left picture area. The jetty 27 can be used to align the bottom ring 10 be used in the circumferential direction.

3 shows the star ring 30 the electrical connection device 1 according to the embodiment of 1 in a perspective view. The star ring 30 is designed as a sheet metal part flat. There are twelve external connection contacts 32 provided, which are designed claw-shaped. For contacting, inside the claw-shaped ends of the outer terminal contacts 32 passed the coil wires and welded or soldered there.

4 shows an electrically insulating intermediate ring 50 the connection device 1 according to the embodiment of 1 in a perspective view. The intermediate ring 50 has substantially the shape of an annular groove, wherein an intermediate ring bottom portion 52 with one on the outer periphery of the intermediate ring bottom portion 52 attaching and upwardly extending outer wall area 54 , and with a to the inner circumference of the intermediate ring bottom portion 52 attaching, and upwardly extending inner wall area 56 is provided. It is on the outside wall area 54 outer terminal contact recesses 58 provided at circumferential positions with the angular positions of the radially outwardly extending outer terminal contacts 72 of the on the intermediate ring floor area 52 placed electrically conductive connection ring 70 correspond. This setup is also very good in 1 at the top electrically insulating intermediate ring 50 with the electrically conductive connection ring lying thereon 70 recognizable. In the inner wall area 56 is an inner terminal contact recess 60 provided at a circumferential position corresponding to the angular position of the axially upwardly extending upper terminal 74 on the intermediate ring floor area 52 placed, electrically conductive connection ring 70 corresponds. This is also very good on the top electrically insulating intermediate ring 50 in 1 recognizable.

5 shows an electrically conductive connection ring 70 the connection device 1 according to the embodiment of 1 in a perspective view. The connection ring 70 has four external connection contacts 72 on, which are forked or claw-shaped. Furthermore, an upper electrically conductive connection contact 74 intended. In the axial direction of the connection ring 70 upwardly extending, upper terminal contact 74 of the connection ring 70 has one at the inner peripheral portion of the terminal ring 70 attaching and upwardly bent transition area 76 and an attached, axially extending upwardly flat terminal region 78 on. In the flat connection area 78 is a passage opening 80 to recognize. The flat connection area 78 serves for contacting, for example by a contact shoe.

6 shows an annular cover 90 the connection device 1 according to the embodiment of 1 in a perspective view. In the assembled state of the connection device 1 covers the annular cover 90 the upper connection ring 70 from, there are the three upper contacts 74 the electrically conductive connection rings 70 up from the annular cover 90 out, and the outer terminals 32 . 72 are covered radially outwards. The cover 90 has a coverage area 92 which lies substantially in a radially lying plane and a cylindrical cover outer wall region 94 on. In the coverage area 92 are slit-shaped holes 96 provided for carrying out the upper connection contacts 74 are provided.

7 shows the cover 90 the connection device 1 according to the embodiment of 1 with the three up through the holes 96 in the coverage area 92 the cover 90 outstanding upper connection contacts 74 in a perspective view.

8th shows the cover 90 the connection device 1 according to the embodiment of 1 in a sectional view. At the coverage area 92 are downwardly projecting locking elements 98 for locking with corresponding locking lugs 26 (in 8th not shown) on the bottom ring 10 are provided, arranged. The locking elements 98 are web-like elastic, so they with the locking lugs 26 at the bottom ring 10 can lock resiliently.

9 shows the connection device 1 according to the embodiment of 1 seen from below. For the basic structure, reference is made to the comments on the previous figures. In this view, however, is particularly good to see that between the bottom ring 10 and the cover 90 an annular gap 120 exists in the outer terminal contacts of the connection rings 72 and the outer terminal contacts of the star ring 32 protrude. In this annular gap for contacting the leads of the coils (in 9 not shown) of the electric motor 4 (in 9 not shown) and with the outer terminal contacts 32 . 72 connected. Through the cover 90 are the external connection contacts 32 . 72 well protected radially outward against mechanical influences and electrical contact.

A connecting device according to the invention can be used for connection to a designed as a three-phase motor with star-delta starting circuit electric motor having a retracted round wire winding. The leads from the coils of the electric motor can thereby into the annular gap 120 between bottom ring 10 and cover 90 led in and there with the outer terminal contacts 32 . 72 the star ring or the connecting rings are connected. The leads may have an insulation, which extend to resistance welded joints, with which the leads to the outer terminal contacts 72 of the connection ring 70 and the external connection contacts 32 of the star ring 30 electrically and mechanically connected.

LIST OF REFERENCE NUMBERS

1

connection device

10

bottom ring

12

radially outer wall section

14

interruption

16

Star ring connector contact interruptions

18

Floor ring floor area

20

first terminal ring terminal breaks

22

second terminal ring terminal breaks

24

third terminal ring connection breaks

26

locking lug

27

web

28

inner peripheral wall

29a

first indentation

29b

second indentation

29c

third indentation

30

star ring

32

outer connection contacts of the star ring

50

intermediate ring

52

Intermediate ring floor area

54

Exterior wall area

56

Inner wall region

58

outer terminal contact recesses

60

inner connection contact recesses

70

Attachment ring

72

external connection contacts of the connection ring

74

upper connection contact

76

Transition area

78

flat connection area

80

Through opening

90

cover

92

coverage area

94

Cover exterior wall area

96

Through opening

98

locking element

99

web

120

annular gap

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 102009020610 A1 [0002]

Claims (18)

Electric, substantially annular connecting device ( 1 ) for a stator of an electric motor with retracted round wire winding, comprising: an electrically insulating bottom ring ( 10 ); an overlying, electrically conductive star ring ( 30 ) having a plurality of radially outwardly extending, outer terminal contacts ( 32 ); three identical pairs, each having a lower, electrically insulating intermediate ring ( 50 ) and an overlying, upper electrically conductive connection ring ( 70 ) with radially outwardly extending, outer terminal contacts ( 72 ) and with an upwardly extending from the radial inner side in the axial direction, upper terminal contact ( 74 ); and a substantially annular cover ( 90 ), the upper connecting ring ( 70 ), from which the three upper connection contacts ( 74 ) of the electrically conductive connection rings ( 70 ) protrude upward and the outer terminal contacts ( 32 . 72 ) covers radially outwards; wherein the three pairs of electrically insulating intermediate rings ( 50 ) and electrically conductive connection rings ( 70 ) are arranged offset in the circumferential direction to each other so that their outer terminal contacts ( 72 ) are each located at mutually circumferentially spaced terminal positions and that their upper terminal contacts ( 74 ) are spaced from each other in circumferentially spaced contact positions. Electrical connection device ( 1 ) according to claim 1, wherein the electrically insulating intermediate rings ( 50 ) each having substantially the shape of an annular groove, with an intermediate ring bottom region ( 52 ), with a at the outer periphery of the intermediate ring bottom area ( 52 ) and upwardly extending outer wall area (FIG. 54 ), and with one on the inner circumference of the intermediate ring bottom area ( 52 ) and upwardly extending inner wall area (FIG. 56 ); and / or wherein in the outer wall area ( 54 ) outer terminal contact recesses ( 58 ) are provided at circumferential positions with the angular positions of the radially outwardly extending, outer terminal contacts ( 72 ) of the intermediate ring floor area ( 52 ) electrically conductive connection ring ( 70 ) correspond; and / or wherein in the inner wall area ( 56 ) an inner terminal contact recess ( 60 ) is provided at a circumferential position coincident with the angular position of the axially upwardly extending upper terminal (FIG. 74 ) of the intermediate ring floor area ( 52 ), electrically conductive connection ring ( 70 ) corresponds. Electrical connection device ( 1 ) according to claim 1 or 2, wherein the axially upwardly extending, upper terminal contact ( 74 ) of each electrically conductive connection ring ( 70 ) one on the inner peripheral region of the connecting ring ( 70 ) and bent upwards ( 76 ) and a thereto attaching, in the axial direction upwardly extending flat terminal area ( 78 ) exhibit. Electrical connection device ( 1 ) according to one of the preceding claims, wherein the electrically insulating bottom ring ( 10 ) radially outer wall sections ( 12 ) with innterruptions ( 14 . 16 ), through which the outer terminal contacts ( 32 ) of the star ring and each electrically conductive terminal ring extend outwardly; and / or wherein the radially outer wall sections ( 12 ) and the interruptions ( 12 , 16 ) are formed so that they the contact positions in the circumferential direction for the outer terminal contacts ( 32 ) of the electrically conductive star ring ( 30 ) and the three electrically conductive connection rings ( 70 ) establish. Electrical connection device ( 1 ) according to one of the preceding claims, wherein in the radially outer wall sections ( 12 ) of the bottom ring ( 10 ) Star ring terminal contact breaks ( 16 ) are formed, which extend from the upper wall end of the respective, radially outer wall portion ( 12 ) extend to a lower height level substantially at the level of the bottom ring bottom area ( 18 ), wherein the number of star ring terminal contact interrupts ( 16 ) the number of radially outwardly extending, outer terminal contacts ( 32 ) of the electrically conductive star ring ( 30 ), and / or wherein the star ring terminal breaks ( 16 ) are provided at circumferential positions which correspond to the angular positions of the radially outwardly extending, outer terminal contacts ( 32 ) of the bottom ring floor area ( 18 ) electrically conductive star ring ( 30 ) correspond. Electrical connection device ( 1 ) according to one of the preceding claims, wherein in the radially outer wall sections ( 12 ) first terminal ring terminal breaks ( 20 ) extending from the upper wall end to a lower height level substantially at a height that is about the height of the star ring (10). 30 ) and the height of the intermediate ring floor area ( 52 ) an electrically insulating intermediate ring ( 50 ) above the bottom ring floor area ( 18 ) lies; wherein the number of first terminal ring terminal breaks ( 20 ) the number of radially outwardly extending, outer terminal contacts ( 72 ) of the first electrically conductive connection ring ( 70 ), and / or wherein the first terminal ring terminal breaks ( 20 ) are provided at circumferential positions which correspond to the angular positions of the radially outwardly extending, outer terminal contacts ( 72 ) of the first intermediate ring ( 50 ) first electrically conductive connection ring ( 70 ) correspond. Electrical connection device ( 1 ) according to claim 6, wherein in the radially outer wall sections ( 12 ) second terminal ring terminal breaks ( 22 ) extending from the upper wall end to a lower height level substantially at a height that is about the height of the star ring (10). 30 ) to the height of the intermediate ring floor area ( 52 ) of the first electrically insulating intermediate ring ( 50 ) to the height of the first electrically conductive connection ring ( 70 ), and the height of the intermediate ring floor area ( 52 ) of the second electrically insulating intermediate ring ( 50 ) above the bottom ring floor area ( 18 ) lies; the number of second terminal ring terminal breaks ( 22 ) the number of radially outwardly extending, outer terminal contacts ( 72 ) of the second electrically conductive connection ring ( 70 ), and / or wherein the second terminal ring terminal interruptions ( 22 ) are provided at circumferential positions which correspond to the angular positions of the radially outwardly extending, outer terminal contacts ( 72 ) of the second intermediate ring ( 50 ) second electrically conductive connection ring ( 70 ) correspond. Electrical connection device ( 1 ) according to claim 7, wherein in the radially outer wall sections ( 12 ) third terminal ring terminal breaks ( 24 ) extending from the upper wall end to a lower height level substantially at a height that is about the height of the star ring (10). 30 ) to the height of the intermediate ring floor area ( 52 ) of the first electrically insulating intermediate ring ( 52 ) to the height of the first electrically conductive connection ring ( 70 ) to the height of the intermediate ring floor area ( 52 ) of the second electrically insulating intermediate ring ( 50 ) to the height of the second electrically conductive connection ring ( 70 ), and the height of the intermediate ring floor area ( 52 ) of the third electrically insulating intermediate ring ( 50 ) above the bottom ring floor area ( 18 ) lies; the number of third terminal ring terminal breaks ( 24 ) the number of radially outwardly extending, outer terminal contacts ( 72 ) of the third electrically conductive connection ring ( 70 ), and / or wherein the third terminal ring terminal breaks ( 72 ) are provided at circumferential positions which correspond to the angular positions of the radially outwardly extending, outer terminal contacts ( 72 ) of the third intermediate ring ( 50 ) third electrically conductive connection ring ( 70 ) correspond. Electrical connection device ( 1 ) according to one of claims 6 to 8, wherein in each case between two star ring terminal contact interruptions ( 16 ) a terminal ring terminal break ( 20 . 22 . 24 ) is arranged; and / or wherein the terminal ring terminal breaks ( 20 . 22 . 24 ) are arranged one after the other in the circumferential direction in such a way that the respectively second connection ring connection contact interruption ( 22 ) between a first terminal ring terminal break ( 20 ) and a third terminal ring terminal break are arranged (24). Electrical connection device ( 1 ) according to any one of the preceding claims, wherein each electrically conductive connection ring ( 70 ) four external connection contacts ( 72 ) and the electrically conductive star ring ( 30 ) twelve external connection contacts ( 32 ) having; and / or wherein the external connection contacts ( 32 . 72 ) are each formed fork-shaped or claw-shaped; and / or wherein the annular cover ( 90 ) a coverage area ( 92 ) which lies substantially in a radially lying plane and a cylindrical cover outer wall region ( 94 ) having. Electrical connection device ( 1 ) according to one of the preceding claims, wherein between the inside of the cylindrical cover outer wall region ( 94 ) On the one hand and the radially outer wall sections () with the interruptions of electrically insulating bottom ring ( 10 ) On the other hand, an annular connection gap ( 120 ) for the connection of the wires of the stator of the electric motor to the outer terminal contacts ( 32 . 72 ) of the electrically conductive connection ring ( 70 ) and the electrically conductive star ring ( 30 ) is formed. Electrical connection device ( 1 ) according to one of the preceding claims, wherein at several of the radially outer wall sections ( 12 ) of the electrically insulating bottom ring ( 10 ) Latching lugs ( 26 ) for latching with one or more latching elements ( 98 ) attached to the annular cover ( 90 ) are arranged are provided. Electrical connection device ( 1 ) according to any one of the preceding claims, wherein the inner peripheral wall ( 28 ) of the electrically insulating bottom ring ( 10 ) three with respect to the lateral surface of the inner peripheral wall ( 28 ) radially inwardly formed recesses ( 29a . 29b . 29c ) for receiving the three upwardly extending in the axial direction, upper terminal contacts ( 74 ) of the three connection rings ( 70 ) having; where the first indentation ( 29a ) from the upper wall end of the inner peripheral wall ( 28 ) extends to a first lower height level that is substantially at a height that is about the height of the star ring ( 30 ) and the height of the intermediate ring floor area ( 52 ) of the first electrically insulating intermediate ring ( 50 ) above the bottom ring floor area ( 18 ) lies; wherein the second indentation ( 29b ) from the upper wall end of the inner peripheral wall ( 28 ) extends to a second lower height level that is substantially at a height that is about the height of the star ring ( 30 ) to the height of the intermediate ring floor area ( 52 ) of the first electrically insulating intermediate ring ( 50 ) to the height of the first electrically conductive connection ring ( 70 ), and the height of the intermediate ring floor area ( 52 ) of the second electrically insulating intermediate ring ( 50 ) above the bottom ring floor area ( 18 ) lies; and wherein the third indentation ( 29c ) extends from the upper end of the wall to a third lower height level that is substantially at a height that is about the height of the star ring ( 30 ) to the height of the intermediate ring floor area ( 52 ) of the first electrically insulating intermediate ring ( 50 ) to the height of the first electrically conductive connection ring ( 70 ) to the height of the intermediate ring floor area ( 52 ) of the second electrically insulating intermediate ring ( 50 ) to the height of the second electrically conductive connection ring ( 70 ), and the height of the intermediate ring floor area ( 52 ) of the third electrically insulating intermediate ring ( 50 ) above the bottom ring floor area ( 18 ) lies. Electrical connection device ( 1 ) according to claim 13, wherein the order of the recesses along the circumference of the electrically insulating bottom ring ( 10 ) first indentation ( 29a ), followed by second indentation ( 29b ), followed by third indentation ( 29c ); and / or wherein in the annular covering area ( 92 ) of the cover ( 90 ) three passage openings ( 96 ) for the three axially extending upwardly, upper terminal contacts ( 74 ) of the three connection rings ( 70 ) are formed, in particular in radially inwardly widened portions of the cover area ( 92 ); and / or wherein the three passage openings ( 96 ) in the coverage area ( 92 ) of the annular cover ( 90 ) with the three recesses ( 29a . 29b . 29c ), and wherein the three axially extending upwardly, upper terminal contacts ( 74 ) of the three connection rings ( 70 ) in the three recesses ( 29a . 29b . 29c ) and through the three passage openings ( 80 ) stand up. Electrical connection device ( 1 ) according to one of the preceding claims, wherein from the underside of the coverage area ( 92 ) of the annular cover ( 90 ) one or more webs ( 99 ) are formed projecting downwards, for engaging in corresponding fixing or locking elements ( 26 ) of the electrically insulating bottom ring ( 10 ); and / or where at the webs ( 99 ) first latching elements ( 98 ), in particular latching noses or recesses, for latching with the bottom ring ( 10 ) are provided; and / or wherein on the outer circumference of the bottom ring ( 10 ) second locking elements ( 26 ), in particular latching noses or depressions, for latching with the cover ( 90 ), in particular the webs ( 99 ) are provided. Electrical connection device ( 1 ) according to one of the preceding claims, wherein on the inner peripheral wall ( 28 ) of the bottom ring ( 10 ) a substantially vertically extending web ( 27 ) is provided; and / or wherein the bridge ( 27 ) starting from the inner peripheral wall ( 28 ) is tapered, in particular wedge-shaped tapered executed. Electric motor with retracted round wire winding, in particular three-phase motor with star-delta start-up circuit, with an electrical connection device ( 1 ) according to one of claims 1 to 16. Electric motor according to claim 17, wherein the external connection contacts ( 72 ) of the electrically conductive connection ring ( 70 ) and / or the external connection contacts ( 32 ) of the electrically conductive star ring ( 30 ) are connected by resistance welding connections with electrical leads of the stator of the electric motor; and / or wherein the leads have insulation up to a position in front of the resistance welded joints.

Images