Connection device for stator of electric machine, stator device for electric machine, and electric drive for vehicle

Abstract

The invention relates to a stator device (1) for an electric machine (203), comprising:-a stator (3), which has a stator core (4), which has a longitudinal axis (6), a first end face (7) and a second end face (8), which is located axially opposite the first end face (7) with respect to the longitudinal axis (6), and which has a stator winding (5), the stator winding (5) forms a winding head (9) on a first end face (7) and has a plurality of connecting portions (10a-c, 11a-c) which extend beyond the winding head (9), and wherein the isolator (13) has a plurality of retaining elements (18a-c, 19a-c) which protrude from the base portion (14) on a second face (16) and are designed to radially retain the isolator (13) on the winding head (9).

Description

Technical Field

[0001] The invention relates to a stator arrangement for an electric machine and an electric drive for a vehicle. Background Art

[0002] A connection device is usually used to connect the stator winding of the stator to a voltage source in order to supply power to the stator winding.Such a connection device can be arranged in the region of the winding head.

[0003] For example, US 2013 / 0147306A1 discloses a spacer for supporting a conductor of a stator assembly of an electric motor. The spacer includes an isolating body made of a non-conductive material. A phase guide groove for receiving a phase conductor is formed in the isolating body. Lugs for connecting the phase conductors are arranged at the ends of the corresponding phase conductors. The isolating body is axially placed on the winding head.

[0004] However, due to unavoidable manufacturing tolerances, the winding heads may be irregularly shaped, making it difficult to position the connection device precisely on the winding heads. This is an obstacle, especially for automated manufacturing of stator devices. Summary of the invention

[0005] The invention is based on the object of providing an improved solution, in particular one which facilitates automated production, for arranging a connecting device in the winding head region of a stator.

[0006] According to the present invention, the object is achieved by a stator device for an electric motor, the stator device comprising: a stator having a stator core, the stator core having a longitudinal axis, a first end face and a second end face, the second end face being positioned axially opposite to the first end face relative to the longitudinal axis, and the stator having a stator winding, the stator winding forming a winding head on the first end face and having a plurality of connecting parts extending beyond the winding head; and a connecting device, the connecting device having an isolating body, the isolating body having a plate-like base part, the base part having a first side away from the winding head and a second side facing the winding head, and the connecting device being designed to connect the connecting part to an electrical conductor; wherein the isolating body has a plurality of retaining elements, the plurality of retaining elements protruding from the base part on the second side and being designed to radially retain the isolating body on the winding head.

[0007] A stator device for an electric motor according to the present invention has a stator. The stator has a stator core. The stator core has a longitudinal axis, a first end face and a second end face. The second end face is located at a position axially opposite to the first end face relative to the longitudinal axis. The stator also has a stator winding. The stator winding forms a winding head on the first end face. The stator winding has a plurality of connecting parts extending beyond the winding head. The stator device according to the present invention also has a connecting device. The connecting device has an isolating body. The isolating body has a plate-shaped base part. The base part has a first side. The first side is away from the winding head. The base part also has a second side. The second side faces the winding head. The connecting device is designed to connect the connecting part to the electrical conductor. The isolating body has a plurality of retaining elements. The retaining elements protrude from the base part on the second side. The retaining elements are designed to radially retain the isolating body on the winding head.

[0008] The invention is based on the consideration of specifying the position of the connection device by means of a retaining element on the winding head. In particular, radial and / or axial slippage of the connection device during manufacturing can thus be prevented. Furthermore, the radial support of the connection device on the winding head is not susceptible to manufacturing tolerances of the stator winding or its winding head. Compared to conventional connection devices which are shaped to be arranged axially directly on the winding head, the stator device according to the invention is more robust with regard to manufacturing tolerances, which greatly simplifies the automated manufacturing of the stator device.

[0009] In a preferred arrangement, the separator is formed from plastic.The base portion is preferably annular sector-shaped such that it extends around the longitudinal axis.

[0010] The stator winding is preferably formed by a plurality of shaped conductors, one of which forms the connecting portion. The shaped conductor is preferably formed by a bent metal rod, preferably a metal rod that has been bent multiple times. Such a stator winding may also be referred to as a hairpin winding.

[0011] In a preferred configuration of the stator device according to the invention, the retaining elements comprise retaining elements of a first type which are at least partially elastically deformable such that they exert a restoring force for retaining the insulation on the winding head. This enables an easy radial clamping of the connection device to the winding head.

[0012] Furthermore, the retaining element comprises a retaining element of a second type, which is designed to absorb the reaction force of the restoring force. The first and second types of retaining elements are preferably arranged on opposite radial sides of the winding head. Preferably, the retaining element of the first type is arranged on the radial inside of the winding head and the retaining element of the second type is arranged on the radial outside of the winding head. However, it is also possible to arrange the retaining element of the first type on the radial outside of the winding head and the retaining element of the second type on the radial inside of the winding head.

[0013] The first type of retaining elements preferably each have a frame and an elastically deformable tab formed in the frame. The tab can be mounted on the frame and exert a restoring force on the winding head.

[0014] In the stator device according to the invention, a plurality of legs are preferably provided which rest on the stator core and position the base part at a distance from the stator to be arranged on the second side of the base part. Thus, the connection device is positioned on the stator with respect to the axial direction.

[0015] In the stator device according to the invention it can also be provided that the base part has a plurality of passage openings through which the connecting part passes.

[0016] Furthermore, it is preferred if the connection device has a star point conductor and the isolating body has a guide element by means of which a movement of the star point conductor in its longitudinal direction and / or transversely to its longitudinal direction can be prevented. The star point conductor can be electrically and mechanically connected to a further connection part of the stator winding. Furthermore, the base part of the isolating body can have a further passage opening through which the further connection part connected to the star point conductor is passed.

[0017] In a preferred improvement, the connecting device also has: an electrically isolated second insulating body, the second insulating body having a plate-shaped base part, the base part having a first side and a second side, the second side being located opposite to the first side and facing the first side of the base part of the first insulating body; and a conductive connecting element, the conductive connecting element having a fixing device for conductively and mechanically connecting to the electrical conductor and arranged on the first side of the second insulating body.

[0018] The second insulating body is preferably made of plastic. It can also be formed into a ring sector around the longitudinal axis.

[0019] In a development, it can be provided that the connecting element has two branch portions and a connecting portion at least partially connecting the two branch portions, wherein the two connecting portions of the stator winding are electrically and mechanically connected to each branch portion of one of the connecting elements so that the connecting portion forms an electrically conductive connection with the electrical conductor via the connecting element. The branch portions preferably extend parallel to the longitudinal axis. The connecting portion can extend from one branch portion to the other branch portion in a plane perpendicular to the longitudinal axis.

[0020] The base part of the second insulating body may also have a recess in which the two connecting parts are arranged. The recess is preferably formed on the edge side of the base part. The recess is preferably open and / or arranged at an edge of the base part of the second insulating body, which edge is positioned radially away from the longitudinal axis.

[0021] A protrusion facing the recess may also be formed on the corresponding branch portion. The protrusion may protrude radially from the branch portion, in particular pointing in a direction away from the longitudinal axis. The connecting portion is preferably electrically conductive and mechanically fixed to the protrusion, in particular by welding.

[0022] As an alternative or in addition, the base part of the first insulating body has a passage opening through which the two connecting parts lead from the winding head to the connecting element.

[0023] The connecting element is preferably a busbar that has been bent several times. The connecting element preferably has a U-shaped profile. The busbar can have a rectangular cross section with a narrow side and a wide side along its extension direction from one of the branch parts on the connecting part to the other branch part. The protrusion preferably protrudes from one of the narrow sides.

[0024] It can also be provided that the base part of the second insulating body has a positioning part arranged on the first side, and the connecting element is arranged on the second insulating body by the positioning part. This enables the positioning part to ensure the position of the connecting element on the first side of the base part of the second insulating body. Therefore, the protrusion of the connecting element can be arranged accurately relative to the recess so as to guide the connecting part of the stator winding through the recess to the protrusion. This enables the connecting part to be arranged accurately relative to the protrusion, which further facilitates the automated manufacturing of the stator device.

[0025] Preferably, a plurality of positioning portions are provided, in particular a plurality of positioning portions corresponding to the number of phases of the stator winding, and one connecting element and one recess for each positioning portion.

[0026] In a preferred configuration of the connection device according to the invention, the fixing means has an internal thread. This means that the electrical conductor can be mechanically fixed firmly to the fixing means and thus to the connection element.

[0027] As an alternative or in addition, a passage opening can be formed in the connecting part, into which the fixing device is pressed. In this case, the connecting element is formed by a plurality of parts. However, the fixing device can also be formed in one piece with the connecting part.

[0028] The fixing means may be formed as a bushing which extends from the connecting portion into the intermediate space defined by the branching portions.The positioning portion is then operatively connected to the bushing for positioning the connecting element in the intermediate space.

[0029] The positioning portion preferably has a centering element formed on a first side, which is at least partially formed in a mirror-inverted manner to the bushing. The centering element preferably partially surrounds the bushing in order to specify the relative position of the connecting element relative to the second insulating body or its base portion.

[0030] In a preferred configuration, it is also provided that the positioning part has a delimiting element extending from one of the branch parts to the other of the branch parts, by which a translational movement of the connecting element parallel to the base part is inhibited. The delimiting element preferably extends between the branch parts. The centering element can be partially formed as a recess of the delimiting element.

[0031] In a preferred refinement, the positioning portion is provided with at least one stopper for at least one branch portion of the connecting element positioned by the positioning element, the stopper being arranged outside the branch portion and being able to inhibit a rotation of the connecting element around a rotation axis perpendicular to the base portion and / or being able to inhibit a translational movement of the connecting element parallel to the base portion of the second insulating body. Particularly preferably, two corresponding stops are provided outside each branch portion.

[0032] The isolating body may also have a shielding element which surrounds the connecting element on the branch portion side for extending the air and creepage distances. The shielding element preferably extends further away from the first side than the connecting element, in particular in the axial direction. In a preferred configuration, the at least one stop is arranged on the shielding element and / or is formed in one piece with the shielding element. The stop may protrude vertically from the shielding element.

[0033] According to a particularly preferred configuration, the positioning portion is provided with a retaining element for each branch portion of the connecting element positioned by the positioning portion, by which the movement of the connecting element away from the first side can be suppressed. In particular, the retaining element is designed to retain the connecting element on the isolating body. The retaining element can be arranged between the branch portions.

[0034] In a refinement, it can be provided that the branch parts each have a recess and that the retaining element is designed to positively engage in the recess. Due to the recess and the retaining element, a latching connection is particularly preferred.

[0035] Furthermore, an eccentric arrangement of the retaining member relative to the branch portion may be provided so as to inhibit the branch portion from interacting with the retaining element in an arrangement rotated by 180°. In other words, the eccentric arrangement may provide an anti-rotation effect when the connecting element is positioned on the second insulating body. This may advantageously prevent incorrect positioning of the connecting element, since a worker will immediately notice an erroneous arrangement, i.e. an arrangement rotated by 180°, due to the incompatibility of the retaining element and the arrangement in this position.

[0036] Furthermore, the first insulating body may have a plurality of fixing portions which protrude from the base portion of the first insulating body in a direction facing the first insulating body and are designed to fix the second insulating body to the first insulating body. In this case, at least some of the fixing portions may be in the form of latching elements which penetrate the passage opening of the base portion of the second insulating body and engage behind the base portion of the second insulating body in order to fix the fixing portions to the first side of the base portion of the second insulating body. Alternatively or additionally, at least some of the fixing portions are provided to engage with fixing means, in particular screws, which pass through the base portion of the second insulating body.

[0037] The object on which the invention is based is also achieved by an electric drive for a vehicle, which has: a stator device according to the invention; a rotor, which is mounted so as to be rotatable relative to the stator device, so that the stator device and the rotor form an electric machine; a converter for supplying power to the stator winding; and an electrical conductor, via which the converter is electrically conductively connected to a connection part. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Further advantages and details of the invention can be found in the exemplary embodiments described below and based on the accompanying drawings. These drawings are schematic diagrams, in which:

[0039] Figure 1 shows a perspective view of an exemplary embodiment of a stator device according to the invention;

[0040] Figure 2 shows a perspective view of a first isolator;

[0041] Figure 3 and Figure 4 Detailed perspective views of the stator and the first isolator are shown respectively;

[0042] Figure 5 A cross-sectional view of the stator and the first isolating body is shown;

[0043] Figure 6 and Figure 7 shows a perspective view of a connection device;

[0044] Figure 8 shows a perspective view of a connecting element;

[0045] Fig. 9 shows a top view of a second isolator;

[0046] Fig.10 showing a detailed perspective view of a second isolator;

[0047] Fig.11 A detailed perspective view showing a second insulating body with a connecting element arranged therein; and

[0048] Fig.12 A schematic diagram of a vehicle with an exemplary embodiment of an electric drive according to the invention is shown. DETAILED DESCRIPTION

[0049] Figure 1 is a perspective view of an exemplary embodiment of a stator device 1 with a connecting device 2 .

[0050] In addition to the connection device 2 , the stator device 1 has a stator 3 with a stator core 4 and a stator winding 5 .

[0051] The stator core 4 has a longitudinal axis 6, a first end face 7 and a second end face 8 located opposite the first end face 7. As an example, the stator core 4 is formed by a plurality of individual laminations (not shown) which are arranged in axial layers and are electrically insulated from each other and can therefore also be referred to as a stator laminated core.

[0052] The stator winding 5 forms a winding head 9 on the first end face 7 and has a plurality of connection portions 10a, 11b, 10c, 11a, 10b, 11c on the first end face 7. In the present exemplary embodiment, the stator winding 5 is formed by a plurality of shaped conductors 12, each of which extends axially through the stator core 4 and is electrically and mechanically connected to each other, for example welded, on the second end face 8. Therefore, the stator winding 5 can also be regarded as a hairpin winding.

[0053] The connection device 2 also has a first insulating body 13. The first insulating body 13 has a plate-like base portion 14 with a first side 15 facing away from the winding head 9 and a second side 16 facing the winding head 9. The base portion 14 is ring-sector-shaped and extends around the longitudinal axis 6.

[0054] Figures 2 to 5 The first isolating body 13 is shown respectively, wherein: Figure 2 is a perspective view of the first insulating body 13, Figure 3 and Figure 4 are perspective views of the stator 3 and the first insulating body 13, respectively, Figure 5 It is a cross-sectional view of the stator 3 and the first insulating body 13 .

[0055] The first insulating body 13 has a plurality of retaining elements 18a, 18b, 18c, 19a, 19b, 19c which are designed to retain the first insulating body 13 on the winding head 9. The retaining elements 18a-c, 19a-c are arranged on the second side 16 of the base part 14 and protrude from the base part 14 in a direction facing the stator core 4.

[0056] The retaining elements 18a-c, 19a-c include a first type of retaining elements 18a-c and a second type of retaining elements 19a-c. The first type of retaining elements 18a-c are partially elastically deformable so that they exert a restoring force for retaining the first insulating body 13. The retaining elements of the second type 19a-c are designed to absorb the reaction force of the restoring force. To this end, the first type of retaining elements 18a-c and the second type of retaining elements 19a-c are arranged on opposite radial sides of the winding head 9. In the present exemplary embodiment, the first type of retaining elements 18a-c are arranged on the radial inner side of the winding head 9, while the second type of retaining elements 19a-c are arranged on the radial outer side of the winding head 9. However, as an alternative, the first type of retaining elements 18a-c can also be arranged on the radial outer side of the winding head 9, while the second type of retaining elements 19a-c are arranged on the radial inner side of the winding head 9.

[0057] In particular, the first type of retaining elements 18a-c each have a frame 20 and an elastically deformable tab 21 formed in the frame. The tab 21 is mounted on the frame 20 and exerts a restoring force on the winding head 9.

[0058] The first insulating body 13 also has three legs 22a, 22b, 22c. The legs 22a-c are formed on the second side 16 and rest on the first end face 7 of the stator core 4. The branch portions 22a-c thus separate the base portion 14 from the first end face 7.

[0059] Furthermore, the base part 14 has a passage opening 23a, 23b, 23c, 23d, 23e, 23f for each connecting part 10a-c, 11a-c (see Figure 2 Each of the connecting parts 10a-c, 11a-c penetrates one of the passage openings 23a-f.

[0060] like Figure 2 and Figure 3 As best seen, the connection device 2 also has a star point conductor 24 formed as a busbar. The star point conductor 24 is arranged in a plurality of guide elements 25, 26 which are arranged to protrude from the first side 15 of the base part 14 of the first insulating body 13. In this case, a movement of the star point conductor 24 along its longitudinal direction or in the circumferential direction relative to the longitudinal axis 6 can be suppressed by the guide elements 25, and a movement of the star point conductor 24 transversely to its longitudinal direction or in the radial direction relative to the longitudinal axis 6 can be suppressed by the guide elements 26. The star point conductor 24 can be electrically and mechanically connected to further connection parts 27 of the stator winding 5. For each further connection part 27, a further passage opening 28 (see Figure 2 ) is formed in the base portion of the first insulator 13.

[0061] Reference again Figure 1 The connection device 2 also has an electrically isolated second insulating body 113 and three electrically conductive connecting elements 114a, 114b, 114c. The second insulating body 113 has a plate-shaped base portion 115, which has a first side 116 and a second side 117 located opposite to the first side. The second side 117 faces the first end face 7 of the stator core 4 and the winding head 9.

[0062] The base part 115 has a recess 118a, 118b, 118c for each connecting element 114a-c. Two of the connecting parts 10a-c, 11a-c can be arranged in each of the recesses 118a-c, e. The two connecting parts 10a-c, 11a-c are mechanically and electrically conductively connected to one of the connecting elements 114a-c, for example by welding. In this case, the two connecting parts 10a-c, 11a-c connected by one of the connecting elements 114a-c are each assigned to one phase of the stator winding 5. In the present exemplary embodiment, the base part 14 is, for example, annular sector-shaped and extends around the longitudinal axis 6. Each connecting part 10a-c, 11a-c clearly penetrates one of the passage openings 23a-f of the first insulating body 13, so that in each case, a pair of connecting parts 10a-c, 11a-c are respectively guided into the recess 118a-c of the base part 115 of the second insulating body 113.

[0063] Figure 6 and Figure 7 A perspective view of a connecting device 2 is shown in each case. Figure 8 is a perspective view of connecting elements 114a-c.

[0064] On the first side 116, the second insulating body 113 has a positioning portion 120a, 120b, 120c for each connecting member 114a-c, by which the connecting elements 114a-c are arranged on the second insulating body 113. The connecting elements 114a-c each have two branch portions 121a, 121b extending away from the first side 116. In the present case of the ring-sector-shaped base portion 115, the branch portions 121a, 121b therefore extend in the axial direction relative to the longitudinal axis 6. In addition, each connecting element 114a-c has a connecting portion 122, which connects the branch portions 121a, 121b at its end facing away from the first side 116.

[0065] Each branch portion 121a, 121b has a protrusion 123 facing the recess 118a-c. With reference to the longitudinal axis 6, the protrusion 123 extends radially outward. Figure 1As can be seen, the connection parts 10a-c, 11a-c can be welded in pairs on the inner side of the protrusion 123 to form an electrically conductive and mechanical connection.

[0066] Furthermore, each connecting element 114a-c has a fixing device 124 for electrically and mechanically connecting the connecting part 122 to the electrical conductor 205 (see Fig.12 ). The fixing device 124 is designed as a bushing and has an internal thread 125. The fixing device 124 is pressed into a passage opening 126 of the connecting part 122. The bushing extends in particular axially into an intermediate space 127 delimited by the branch parts 121a, 121b.

[0067] Fig. 9 and Fig.10 A second isolator 113 is shown, wherein Fig. 9 is a plan view of the first side 116 thereof, Fig.10 is a detailed perspective view of the positioning portion 120a. Fig.11 is a detailed perspective view of the second insulating body 113 arranged with the connecting element 114a. The arrangement of the connecting elements 114a-c on the first insulating body 113 is explained below with reference to the positioning portion 120a and the connecting element 114a, which represent the further positioning portions 120b, 120c and the connecting elements 114b, 114c.

[0068] The positioning portion 120a firstly comprises a centering element 128 formed on the first side 116. The centering element 128 is divided into two parts, whose sections are formed in a mirror-inverted manner with the fixing device 124 in the form of a bushing. In order to center the connecting element 114a, the fixing device 124 is inserted into the centering element 128.

[0069] In order to suppress the translational movement of the connecting element 114a, the positioning part 120a has, for each branch part, a delimiting element 129 extending from the branch part 121a to the branch part 121b and a stopper 130a, 130b, 130c, 130d arranged outside the branch parts 121a, 121b. Here, as an example, two stops 130a-d are arranged outside each of the branch parts 121a, 121b. The rotational movement of the connecting element 114a around the rotation axis perpendicular to the base part 115 can also be suppressed by the stops 130a-d. In the present exemplary embodiment, the centering element 128 is partially in one piece with the delimiting element 129.

[0070] Furthermore, the positioning portion 120a has a retaining element 131a, 131b for each branch portion 121a, 121b, which is designed in the present case as a latching element. By means of the retaining elements 131a, 131b, a movement of the connecting element 114a pointing away from the first side 116 or in the axial direction relative to the longitudinal axis 6 can be suppressed. For this purpose, each branch portion 121a, 121b has a recess 132 (see also Figure 8 ), the retaining elements 131a, 131b positively engage in the recess 132. As an additional protection measure to prevent the connecting element 114a from being inserted into the positioning part 120a in a 180° twisted manner, the retaining elements 131a, 131b are arranged eccentrically relative to the corresponding branch parts 121a, 121b.

[0071] In order to extend the air and creepage distances between the connecting elements 114a-c and / or other conductive components near the connecting elements 114a-c, the second isolating body 113 also has shielding elements 133a, 133b, 133c, 133d, 133e, which surround the corresponding connecting elements 114a-c on the branch part side. In this case, the stoppers 130a-d are formed in one piece with the shielding elements 133a-e.

[0072] Reference again Figure 2 and Figure 7 , the first isolating body 13 initially has two spacers 17, which separate the first isolating body 13 from the second isolating body 113. Figure 2 As can also be seen in FIG. 1 , the first insulating body 13 also has a plurality of fixing portions 29a, 29b, 29c, 29d, 29e, 30a, 30b, 30c, 30d which protrude from the base portion 14 in a direction facing the second insulating body 113 and are designed to fix the second insulating body 113 to the first insulating body 13. In this case, the fixing portions 29a-e are formed as latching elements which penetrate through a passage opening of the base portion 115 of the second insulating body 114 and engage the base portion 115 of the second insulating body 113 for fixing on the first side 116. On the other hand, the fixing portions 30a-d each engage with a fixing means 31 which penetrates through the base portion 115 of the second insulating body 113, in this case for example a screw.

[0073] Fig.12 A schematic diagram of a vehicle 200 with an exemplary embodiment of an electric drive 201 is shown.

[0074] The electric drive 201 has an electric machine 203 formed by a stator device 1 and a rotor 202 which is mounted so as to be rotatable relative to the stator device 1. The electric machine 203 is, for example, a permanent or electrically excited synchronous machine or an asynchronous machine.

[0075] Furthermore, the electric drive 201 has a converter 204 in the form of an inverter, which is designed for supplying power to the stator winding 5 (see Figure 1 ). The converter 204 is connected to the stator winding via electrical conductors 205, each of which is in the form of a busbar, for example. In this case, each electrical conductor 205 is conductively fixed to one of the fixing means 24 of one of the connecting elements 114a-c (see Figure 8 ), so that an electrically conductive connection is formed between the connection parts 10a-c, 11a-c and the electrical conductor 205 via the connection elements 114a-c.

[0076] The vehicle 200 also has wheels 206. The motor 202 is configured to drive at least one of the wheels 206 indirectly, for example via a gear mechanism (not shown), or directly, for example in the form of a hub motor. The vehicle 200 may also have a shaft (not shown) that is coupled to the wheels 206 and drives the motor 203 of the vehicle 200 directly or indirectly.

[0077] The vehicle 200 is a battery electric vehicle (BEV), a vehicle operated by a fuel cell, or a hybrid vehicle. In the latter case, the vehicle 200 also has an internal combustion engine (not shown).

Claims

1. A stator device (1) for an electric motor (203), comprising: - a stator (3), the stator (3) having a stator core (4), the stator core (4) having a longitudinal axis (6), a first end face (7) and a second end face (8), the second end face (8) being located axially opposite to the first end face (7) relative to the longitudinal axis (6), and the stator (3) having a stator winding (5), the stator winding (5) forming a winding head (9) on the first end face (7) and having a plurality of connecting parts (10a-c, 11a-c) extending beyond the winding head (9); and - a connecting device (2), the connecting device (2) having an isolating body (13), the isolating body (13) having a plate-shaped base part (14), the base part (14) having a first side (15) remote from the winding head (9) and a second side (16) facing the winding head (9), the connecting device being designed to connect the connecting part (10a-c, 11a-c) to an electrical conductor (205); in, The insulating body (13) has a plurality of retaining elements (18a-c, 19a-c) which protrude from the base portion (14) on the second side (16) and are designed to radially retain the insulating body (13) on the winding head (9).

2. The stator device according to claim 1, wherein: The retaining elements (18a-c, 19a-c) comprise retaining elements (18a-c) of a first type which are at least partially elastically deformable such that they exert a restoring force for retaining the insulating body (13) on the winding head (9).

3. The stator device according to claim 2, wherein: The retaining elements (18a-c, 19a-c) comprise retaining elements (19a-c) of a second type, which are designed to absorb a reaction force to the restoring force.

4. The stator device according to claim 3, wherein: The first and second types of retaining elements (18a-c, 19a-c) are arranged on opposite radial sides of the winding head (9).

5. The stator device according to any one of claims 2 to 4, wherein: The first type of retaining elements (18a-c) each have a frame (20) and an elastically deformable tab (21) formed in the frame (20), the tab (21) being mounted on the frame (20) and exerting a restoring force on the winding head (9).

6. A stator device as claimed in any one of the preceding claims, wherein: A plurality of legs (22a-c) are arranged on a second side (16) of the base portion (14), the legs (22a-c) resting on the stator core (4) and positioning the base portion (14) at a distance from the stator (3).

7. A stator arrangement according to any one of the preceding claims, wherein The base part (14) has a plurality of passage openings (23a-f) through which the connecting parts (10a-c, 11a-c) pass.

8. A stator arrangement according to any one of the preceding claims, wherein The connecting device (2) has a star point conductor (24), and the isolating body (13) has guide elements (25, 26) by which the star point conductor (24) can be prevented from moving along the longitudinal direction of the star point conductor (24) and / or transversely to the longitudinal direction of the star point conductor (24).

9. A stator device as claimed in any one of the preceding claims, wherein: The connecting device (2) further comprises: - an electrically isolated second isolating body (113), said second isolating body (113) having a plate-shaped base portion (115), said plate-shaped base portion (115) having a first side (116) and a second side (117), said second side (117) being opposite to said first side (116) and facing towards the first side (15) of the base portion (14) of said first isolating body (13), and - an electrically conductive connecting element (114a-c) having a fixing device (124) for electrically conductively and mechanically connecting to an electrical conductor (205) and arranged on the first side (116) of the second insulating body (113).

10. The stator device according to claim 9, wherein: The connecting element (114a-c) has two branch parts (121a, 121b) and a connecting part (122), wherein the connecting part (122) at least partially connects the two branch parts (121a, 121b), wherein the two connecting parts (10a-c, 11a-c) of the stator winding (5) are electrically and mechanically connected to each of the branch parts (121a, 121b) of one of the connecting elements (114a-c), so that the connecting parts (10a-c, 11a-c) form an electrically conductive connection with the electrical conductor (205) via the connecting element (114a-c).

11. The stator device according to claim 10, wherein: The base portion (115) of the second insulating body (113) has a recess (118a-c), in which the two connecting portions (10a-c, 11a-c) are arranged.

12. The stator device according to any one of claims 9 to 11, wherein: The first insulator (13) has a plurality of fixing portions (29a-e, 30a-d), which protrude from a base portion (14) of the first insulator (13) in a direction facing the first insulator (113) and are designed to fix the second insulator (113) to the first insulator (13).

13. The stator device according to claim 12, wherein: - at least some of the fixing portions (29a-e) are in the form of latching elements which penetrate through a passage opening of the base portion (115) of the second insulating body (113) and engage behind the base portion (115) of the second insulating body (113) in order to fix the fixing portions on the first side (116) of the base portion (115) of the second insulating body (113), and / or - At least some of the fixing portions (30a-d) are engaged with fixing means (31), in particular screws, which penetrate a base portion (115) of the second insulating body (113).

14. An electric drive (201) for a vehicle (200), comprising: - a stator arrangement (1) according to any one of the preceding claims, - a rotor (202) mounted so as to be rotatable relative to the stator device (1), such that the stator device (1) and the rotor (202) form an electric machine (203), - a converter (204) for supplying power to the stator winding (5), and - the electrical conductor (205), via which the converter (204) is electrically conductively connected to the connection parts (10a-c, 11a-c).

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