Motor housing of a compressor and method for contacting an electric motor

Abstract

Motor housing (8) of a compressor, wherein the motor housing (8) has several bores for receiving feedthrough contacts (6) and a stator (12), characterized in that several feedthrough contacts (6) are arranged in the bores, that a circuit board (10) with components necessary for controlling a motor is arranged, that busbars (1) are arranged between the feedthrough contacts (6) and the circuit board (10) such that each busbar (1) is connected to an associated feedthrough contact (6) at a first end (3) which has a hole (5) having a diameter smaller than that of the feedthrough contact (6), and that each busbar (1) is connected to the circuit board (10) at a second end (4).

Description

[0001] The invention relates to a motor housing of a compressor, wherein the motor housing has a plurality of bores for receiving feedthrough contacts and a stator, and wherein a plurality of feedthrough contacts are arranged in the bores, and wherein a printed circuit board with components necessary for controlling an electric motor is arranged, and wherein busbars for contacting the feedthrough contacts of the electric motor are arranged between the feedthrough contacts and the printed circuit board, wherein each busbar has a first end and a second end.

[0002] The invention also relates to a method for contacting a feedthrough contact of an electric motor, wherein a busbar is electrically conductively connected to the feedthrough contact.

[0003] For example, when operating single- or multi-phase electric motors housed in a hermetically sealed housing, it is necessary to supply the motor with operating current without compromising the system's tightness. For this purpose, it is known to supply the required operating voltage or current via so-called feedthrough contacts. Such a motor could be, for example, a refrigerant compressor in a vehicle.

[0004] DE 10 2015 103 053 A1 discloses an electrical feedthrough unit for passing electrical contacts through a wall of an electric motor housing. The feedthrough unit comprises a pin made of an electrically conductive material and a surrounding sleeve. This description further relates to a housing of an electric motor containing at least one such electrical feedthrough unit, as well as to an electric motor having such a housing.

[0005] The electrical feedthrough unit comprises a pin made of an electrically conductive material, which is surrounded by an electrically insulating sleeve. The pin has an at least partially conical support surface for the area of ​​a passage through the wall of the housing and, together with the surrounding sleeve, is arranged in an at least partially conical bore extending through the wall of the housing.

[0006] The advantage of this proposed solution is that it allows for very simple and cost-effective assembly of the motor components in the motor housing by saving assembly time and effort, as well as parts costs. It also offers several advantages over the use of conventional glass-to-metal seals (GTS). The openings in the motor housing required for the electrical feedthrough units are small, resulting in improved pressure resistance and rigidity of the motor housing. The cross-sectional area to be sealed is also small, thus resulting in lower leakage and permeation rates.

[0007] Such feedthrough contacts must be electrically connected both on the motor side in the hermetic housing and on the side outside the hermetic housing.

[0008] It is known from the prior art to establish this contact, for example, using spring contact sleeves or spring contact elements. These spring contact sleeves or spring contact elements are then electrically connected to the cable or busbar carrying the electrical current by pressing, soldering, or welding. For example, a three-phase electric motor is provided with a structural unit for supplying voltage and current, which comprises three busbars, each with a spring contact sleeve pressed, soldered, or welded to a first end of a busbar. The second end of each busbar is provided in such a way that it can be passed through a circuit board, for example, and soldered to it.Such a multi-layer printed circuit board, for example, carries the components required to control the motor, which may be part of an inverter circuit.

[0009] Solutions are also known from the prior art whereby the spring contact sleeves or spring contact elements are integrated into the busbar. This integration of the spring contact sleeves can be achieved, for example, by pressing, soldering, or welding.

[0010] Such spring contact sleeves or spring contact elements, which are intended to create an electrically conductive connection with a very low contact resistance and also enable tolerance compensation between the busbar and the feedthrough contact, are known, for example, from DE 10 2004 017 659 A1.

[0011] The disadvantage of this known state of the art is that the cables or busbars leading from the feedthrough contact must each be equipped with a spring contact sleeve or a spring contact element.

[0012] Such spring contact sleeves or spring contact elements are mechanically complex components that must be connected to a busbar in a separate assembly step. Both the purchase of the spring contact sleeves or spring contact elements and their installation with or in the busbar incur costs and require a corresponding amount of assembly time.

[0013] The effort involved in manufacturing a spring contact sleeve or spring contact element, for example, lies in the fact that a spring steel must be punched out to create individual spring-loaded lamellae. This semi-finished product is then rolled up in a subsequent manufacturing step and inserted, for example, into a retaining sleeve. The spring sleeve is then usually secured with retaining clips to prevent it from shifting or falling out. The resulting structure is then connected to the busbar in a further step, for example, by pressing.

[0014] The disadvantages presented show that there is a need for a suitable solution which does not require the component of a spring contact sleeve or a spring contact element when contacting an electric motor and does not require the additional assembly step of connecting the spring contact sleeve or the spring contact element to the busbar.

[0015] DE 10 2015 119 785 A1 discloses a hole contour for press-fitting into a lead frame. The goal is to create a solderless electrical connection with reliable contact. For this purpose, the solderless electrical connection is implemented with a press-fit pin and a component, such as a lead frame, that has a recess into which the press-fit pin can be inserted. A section of the recess located at the front in the insertion direction is designed with an approximately conical contour, the axial length of which is more than 5%, for example, more than 20%, of the axial length of the recess.

[0016] KR 10 2016 0 034 118 A discloses a structure for connecting a terminal of a stator. One end is electrically connected to the coil of a stator, and the other end is electrically connected to a terminal connecting portion of an inverter, in order to electrically connect the coil of the stator to the inverter. The terminal is bent in a space between the inverter and the stator and is formed toward the terminal connecting portion of the inverter. This is intended to make it possible to reduce manufacturing costs and weight. Furthermore, an inverter substrate is to be provided that is optimized for heat radiation of an inverter power semiconductor device.

[0017] EP 2 371 673 A2 describes an electric drive device comprising an electric motor; a controller arranged on an axis line of a rotation shaft of the electric motor and controlling the electric motor; a motor terminal extending parallel to an axial direction of the rotation shaft from the electric motor toward the controller; and a controller output terminal provided on an extension line of the motor terminal and bent into an L-shape at a portion having a slotted portion connected to the motor terminal. The slotted portion is provided with a pressure contact portion formed from a projection provided on the slotted portion extending toward the end.The motor terminal is pressure-contacted from the protrusion, and the motor terminal is press-fitted to the controller output terminal in a process of combining the controller and the electric motor to electrically connect the two terminals by bringing the two terminals into a pressure-contact state.

[0018] From DE 10 2012 212 945 A1, an inverter is known with a semiconductor switch and a busbar electrically contacted therewith, as well as with a printed circuit board having electronic components for controlling the semiconductor switch, wherein the busbar is at least partially spaced from the printed circuit board and has a shunt in this area which is contacted with the printed circuit board by means of contact elements.

[0019] DE 10 2015 100 149 A1 describes an electrical functional component with at least one electrically conductive conductor track, wherein at least one contact pin is attached to the conductor track and can be contacted with a functionally complementary contact element, in particular in a plug or a socket. A contact zone is provided between the conductor track and the contact pin, which electrically conductively connects the conductor track and the contact pin to one another. The electrically conductive contact zone is designed in the manner of an annular, cold-press-welded transition zone, wherein the surface material of the conductor track and / or the surface material of the contact pin has at least one cold-forming zone in the transition zone, and wherein on or in at least one cold-forming zone, at least in some regions, a welding zone is present, in which the contact pin and the conductor track are electrically conductively connected to one another by a material bond.

[0020] The object of the invention is to provide an arrangement and method for contacting an electric motor, thereby achieving simple and reliable contacting of the electric motor. Furthermore, both assembly and cost are to be reduced.

[0021] The problem is solved by an object having the features according to claim 1 of the independent patent claims. Further developments are specified in the dependent patent claims 2 to 5.

[0022] The subject matter of patent claim 1 is a motor housing of a compressor, wherein the motor housing has a plurality of bores for receiving feedthrough contacts and a stator. According to the invention, a plurality of feedthrough contacts are arranged in the bores, wherein a printed circuit board with components necessary for controlling a motor is arranged, and wherein busbars are arranged between the feedthrough contacts and the printed circuit board such that each busbar is arranged with a first end, which has a hole that is undersized compared to the diameter of the feedthrough contact, connected to an associated feedthrough contact, and that each busbar is arranged with a second end connected to the printed circuit board.

[0023] The busbars are designed, for example, as a stamped part made of conductive sheet metal. For example, in a first manufacturing step, the busbar can be punched out of sheet metal. In a second manufacturing step, the busbar is bent at an angle of 90 degrees, for example, at a second end to be connected to a circuit board. This angled end of the busbar can be guided through a designated opening in the circuit board and soldered to a conductor track on the circuit board, for example, on the side of the circuit board facing away from the motor.

[0024] To create an electrically conductive and mechanically stable contact between the busbar and the feedthrough contact, the first end of the busbar is provided with a hole. This hole can be round, for example, or in another suitable shape, such as a triangle, n-gon, or a cloverleaf structure.

[0025] Regardless of whether the hole is round, for example, it is intended that the hole be made with an undersize, i.e. smaller than the diameter of the feedthrough contact or pin to be contacted, which has a circular cross-section.

[0026] Alternatively, if the feedthrough contact has a square cross-section at its end protruding from the feedthrough, the hole in the busbar can be adapted to this cross-section. In this case, the hole is also square, for example, but again has a smaller cross-section than the feedthrough contact.

[0027] In this way, it is possible to achieve a secure connection between the busbar and the feed-through contact by sliding and pressing the busbar onto the contact.

[0028] In order to achieve a larger contact area between the busbar according to the invention and a feedthrough contact, it is further advantageous if the hole in the busbar is widened, for example by means of a flanging means or a similar means, to include flanks that form around the hole. In this case, the area with which the busbar is connected to the feedthrough contact is no longer essentially determined by the material thickness of the busbar, but rather by the flanks created by the flanging. In such a design, the inner diameter of the hole created after flanging is designed to be undersized, i.e. smaller than the diameter of the feedthrough contact or pin to be contacted.

[0029] In both the version with and without flanged edges, the busbar is positioned with the hole, for example, under the feedthrough contact, and then the feedthrough contact is inserted into the busbar and crimped. For this purpose, pressure is applied to the feedthrough contact while the busbar is held in position. It is also intended to perform this crimping process evenly and at a controlled speed. For this purpose, a suitable arrangement with a suitable control system is provided, which carries out the crimping process evenly and enables displacement-force control.

[0030] This pressing process, which is controlled in terms of its travel distance, applied force, and required time, achieves a cold weld between the surfaces of the feedthrough contact and the busbar in the contacted area. Furthermore, this control prevents the resulting cold weld from reopening.

[0031] The invention provides a busbar which can be installed directly between a circuit board and a feedthrough contact of a motor without an additional part, such as a spring contact sleeve or a spring contact element, and which electrically connects the circuit board to the feedthrough contact.

[0032] It is also planned to introduce one or more bends or kinks into the busbar to compensate for tolerances, for example through a pressing process. This gives the busbar a section that runs in an arc or meander shape and is suitable, for example, to compensate for tolerances or to absorb or reduce mechanical stresses caused by thermal changes. Such tolerances are usually due to manufacturing processes and relate, for example, to the position of the feedthrough contacts to a circuit board between which the busbar is inserted. Such tolerance compensation is particularly necessary for an electric refrigerant compressor in a vehicle, since temperature differences occur here due to function and mechanical stresses must be compensated to ensure the reliable functioning of the refrigerant compressor.

[0033] The problem is also solved by a method having the features according to claim 6 of the independent claims. Further developments are specified in dependent claims 7 to 10.

[0034] A special method is described below for creating a conductive, mechanically robust connection between the busbar according to the invention and a feedthrough contact in a motor. However, the installation or pressing of the busbar is also possible without using the method described below.

[0035] In preparation for the method for contacting an electric motor having a plurality of the feedthrough contacts described above, each of which is to be electrically conductively connected by means of a busbar according to the invention, a so-called holding plate is provided. This holding plate advantageously has recesses for receiving the busbars required for contacting. These recesses have the task of holding the busbars inserted into the recesses in their position during the method or assembly operation. Alternatively, the holding plate can also be designed without recesses. In this embodiment, appropriate holding means, such as one or more lateral limits or positioning pins, are provided for fixing the busbars.

[0036] In addition, the retaining plate has a countersunk hole in each hole at the positions corresponding to the holes in the inserted or mounted busbars. These countersunk holes are designed to be larger in diameter than the diameter of the feedthrough contact to be pressed into the hole in the busbar, thus enabling an unobstructed press-in process.

[0037] In the event that a three-phase electric motor is to be contacted with three feed-through contacts, the holding plate has three recesses or holders suitable for accommodating three busbars, into which the three busbars are inserted.

[0038] Also provided is a hermetically sealed motor housing or the corresponding part of a motor housing, which has the holes, designed, for example, as conical holes, for accommodating the feedthrough contacts. Also provided is a stator to be inserted into the motor housing, which is already pre-assembled with the feedthrough contacts to be pressed into the busbars. In a three-phase motor, for example, the stator is pre-assembled with three feedthrough contacts.

[0039] At the beginning of the process for contacting an electric motor, which is subsequently referred to as the press-in process, the busbars are inserted into the mounting plate at the designated positions. The motor housing or the corresponding part of a motor housing is then aligned over the mounting plate and placed on the mounting plate. Alignment is performed in such a way that the holes or conical holes, for example, made in the motor housing for accommodating the feedthrough contacts, are positioned vertically over the holes in the busbars.

[0040] Furthermore, the stator with its pre-assembled feedthrough contacts is positioned and aligned over the motor housing so that it can be inserted into the motor housing, with the holes of the busbars aligned with the feedthrough contacts. Typically, the stator has an outer diameter that allows it to be pressed into the inner diameter of the motor housing. After the stator has been pressed in, it is securely mounted or held in place by pressing. In addition to the option of pressing in, a shrink-fitting process or a combination of pressing in and shrink-fitting can also be used.

[0041] To position the stator in the described position, for example above the motor housing, a corresponding bracket is provided which is adapted to the stator and holds it securely.

[0042] Using this bracket, the stator is inserted or pressed into the motor housing. While the stator with the pre-assembled feedthrough contacts is continuously pressed into the motor housing, the distance between the feedthrough contacts and the corresponding holes in the motor housing continues to decrease until the feedthrough contacts fit into the holes.

[0043] As the press-in process continues, the feedthrough contacts reach the holes of the corresponding busbars and are pressed into these pre-prepared holes. Due to the undersize of these holes, the feedthrough contacts are pressed into the holes in such a way that contact is established, for example, through a cold weld. In this type of cold weld, metallic materials are joined together under high pressure at room temperature in such a way that the resulting connection is very similar to that created by "normal" welding.

[0044] Once the bracket has reached its final position, the press-fitting process is complete. At the end of the press-fitting process, both the stator is pressed into the motor housing and the feedthrough contacts are pressed into the busbars.

[0045] The resulting unit, consisting of motor housing, feedthrough contacts and busbars, is removed from the holding plate and can be fed into a subsequent assembly step.

[0046] As is already known from the prior art, a so-called feedthrough unit comprises a pin or feedthrough contact made of an electrically conductive material and a sleeve surrounding the feedthrough contact for electrically insulating the feedthrough contact from the housing. It is intended to insert such sleeves or insulating sleeves into the bores of the housing before the press-fitting process begins, or to provide the housing with insulating sleeves inserted into the bores.

[0047] It is also intended that the holder be designed in such a way that it can not only exert a force on the stator to be pressed in, but that the holder also has elements, for example, that enable direct force transmission to the feedthrough contacts to be pressed in. By exerting a direct force on the feedthrough contacts, the connection between the stator and the feedthrough contacts already connected to the stator is not subjected to significant mechanical stress during the press-in process, thus counteracting defects caused by excessive mechanical stress.

[0048] It is also intended that the holes in the housing of a motor, which serve to accommodate the feedthrough contacts, are designed as conical holes.

[0049] The described process has the advantage that both the stator and the feedthrough contacts can be pressed into the motor in a single press-fitting process, thus shortening assembly time and reducing assembly effort. These advantages also have a positive impact on manufacturing costs.

[0050] Further details, features, and advantages of embodiments of the invention will become apparent from the following description of exemplary embodiments with reference to the accompanying drawings. They show: Fig. 1: a unit intended for contacting a motor, consisting of three busbars each with pressed-in spring contact sleeves of the state of the art, Fig. 2: an alternative three-rail unit for contacting an electric motor from the state of the art, each with integrated spring contact sleeves, Fig. 3: an embodiment of a busbar according to the invention, Fig. 4: an alternative embodiment of a busbar according to the invention, Fig. 5 a sectional view through a feedthrough contact with a pressed-on busbar, Fig. 6 a device for carrying out the method for contacting an electric motor with the busbars according to the invention in a first state, Fig. 7 the device for carrying out the method for contacting an electric motor with the busbars according to the invention in a second state and Fig. 8 a perspective view of a motor housing with feedthrough contacts and pressed-on busbars.

[0051] In the Fig. 1 shows a unit intended for contacting a motor, consisting of three busbars 1', each with pressed-in spring contact sleeves 2 from the prior art. Each of the three prior art busbars 1' has a spring contact sleeve 2 at a first end 3, which is electrically connected to the busbar 1'. These spring contact sleeves 2 can be welded, soldered, or screwed to the busbar 1', for example.

[0052] At each of the second ends 4, the busbars 1' have an end that is suitable, for example, for connection to a printed circuit board 10 (not shown). Such an electrically conductive connection is made, for example, by soldering or screwing.

[0053] The three busbars 1' are arranged in a common receptacle or housing that insulates the busbars 1' from each other. The spring contact sleeves 2 of the busbars 1' are pushed onto the feedthrough contacts 6 of a motor, thus connecting a printed circuit board 10 controlling the motor to the feedthrough contacts 6, which are connected, for example, to a stator with multiple stator windings. This allows a control voltage or control current to be supplied to the motor.

[0054] In the Fig. 2 shows an alternative unit comprising three busbars 1' for contacting an electric motor from the prior art, each with integrated spring contact sleeves 2. In this embodiment, the spring contact sleeves 2 are arranged integrated in a special receptacle at the first end 3 of the busbar 1' and connected to the busbars 1'.

[0055] The Fig. 1 and Fig. However, the designs shown in Figure 2 have the disadvantage that the cables or busbars to be contacted with a feedthrough contact 6 must each be equipped with a spring contact sleeve 2 or a spring contact element at a first end 3, which makes these solutions complex and expensive.

[0056] In the Fig. Figure 3 shows a first embodiment of a busbar 1 according to the invention. The busbar 1 is punched out, for example, from a conductive sheet of appropriate thickness or strength and provided with a hole 5 at its first end 3. This hole 5 serves, in a subsequent press-fitting process, to accommodate a feedthrough contact 6 (not shown). One or more of these feedthrough contacts 6, which have a circular cross-section, are arranged, according to the prior art, in corresponding bores in the housing 8 of a motor in order to establish an electrical connection between stator windings arranged in the motor and a control unit.

[0057] Optionally, the second end 4 of the busbar 1 can be angled and / or formed into a contact which is electrically connected to the control unit controlling the motor to be contacted.

[0058] The hole 5 in the busbar 1 can be round or oval, for example. Regardless of the specific shape of the hole 5, it is designed such that the hole 5 is undersized relative to the feedthrough contact 6. The hole 5 therefore has an inner diameter that is smaller than the outer diameter of the feedthrough contact 6 to be contacted.

[0059] In this way, it is possible to achieve a secure connection between the busbar 1 and the feedthrough contact 6 when pushing or pressing the busbar 1 onto the contact 6 during a pressing process.

[0060] The Fig. The busbar 1 shown in Figure 3 has a shaped edge or collar 7 in the area of ​​the hole 5, as is known, for example, from the field of collar drawing. By shaping this collar 7, the area of ​​the contact surface formed between the busbar 1 according to the invention and a feedthrough contact 6 is enlarged, thus, for example, reducing the contact resistance between the busbar 1 and the feedthrough contact 6.

[0061] Such a collar 7 can, for example, also be formed around the hole 5 using a flanging means or a similar means. When dimensioning the collar 5, it is intended that the inner diameter of the resulting hole 5 with the collar 7 has the undersize described above.

[0062] Other suitable shapes, such as a triangle or an n-gon or a cloverleaf structure, can also be used to shape the hole 5. An example of a design of the hole 5 in the form of a cloverleaf structure is shown in the Fig. 4 shown.

[0063] The Fig. Figure 5 shows a sectional view in which the busbar 1, with a collar 7 formed at the first end 3 in the region of the hole 5, has been pressed onto a feedthrough contact 6, thus forming a mechanically stable and electrically conductive connection to the feedthrough contact 6. The feedthrough contact 6 is shown arranged in a bore in a motor housing 8 and is electrically insulated from the motor housing by means of an insulating sleeve 9.

[0064] The second end 4 of the busbar 1 is bent at an angle of, for example, 90 degrees and is thus angled. This angled end of the busbar 1 can be guided through a designated opening in the circuit board 10 and soldered to a conductor track of the circuit board 10, for example, on the side of the circuit board 10 facing away from a motor housing 8. The circuit board 10 is shown only symbolically and can accommodate the assemblies or components necessary for controlling the motor, which may be part of an inverter.

[0065] In the Fig. Figure 6 shows a device for carrying out the method for contacting an electric motor (press-fitting process) with the busbars 1 according to the invention in a first state. This state corresponds to the beginning of the press-fitting process, in which the required individual parts have been provided and placed in their respective positions.

[0066] To prepare for the process, a holding plate 11 is provided. This holding plate 11 has, for example, recesses for receiving the busbars 1 required for contacting. These recesses are designed to hold the inserted busbars 1 in position during the press-fitting process. Alternative means for securing the busbars 1 to the holding plate 11 are possible.

[0067] The retaining plate 11, for example, has countersunk holes whose position corresponds to the holes 5 of the inserted busbars 1. These countersunk holes are designed with a diameter larger than the diameter of the feedthrough contact 6 to be pressed into the hole 5 of the busbar 1, thus enabling a press-in process without the feedthrough contact 6 coming into contact with the retaining plate 11.

[0068] The Fig. Figure 6 shows the case where a three-phase electric motor is to be contacted with three feedthrough contacts 6. Thus, the holding plate 11 has three recesses suitable for receiving three busbars 1, into which the three busbars 1 are shown inserted. Fig. Figure 6 only shows a schematic diagram to explain the press-in process and does not clearly show the exact path of the inserted busbars 1. However, the three downwardly angled second ends of the three busbars 1 as well as the three first ends 3 with their holes 5 are clearly shown.

[0069] Before the press-in process begins, a hermetically sealable motor housing 8 or a corresponding part of a motor housing 8 is also provided, which has the holes for receiving the feedthrough contacts 6. The insulating sleeves 9 are inserted or already secured into these conical holes.

[0070] As in the Fig. 6, a stator 12 is also provided to be inserted into the motor housing 8, which stator has already been pre-assembled with the feedthrough contacts 6 to be pressed into the busbars 1. In the three-phase motor shown, the stator 12 is pre-assembled with three feedthrough contacts 6 connected.

[0071] At the beginning of the press-in process, the busbars 1 are inserted into the holding plate 11 at the designated positions. Subsequently, the motor housing 8 or the corresponding part of a motor housing 8 is aligned over the holding plate 11 and placed on the holding plate 11. Alignment is performed such that the conical bores in the motor housing 8 for receiving the feedthrough contacts 6 are positioned vertically over the holes 5 of the busbars 1.

[0072] Furthermore, the stator 12 with its pre-assembled feedthrough contacts 6 is arranged and aligned over the motor housing 8 by means of a holder (not shown) such that it can be inserted into the motor housing 8. Furthermore, the stator 12 is aligned such that the feedthrough contacts 6 will reach the holes 5 of the busbars 1 during the subsequent press-in process. The holes 5 are thus located in the imaginary extension of the feedthrough contacts 6.

[0073] The holder is designed in such a way that it can simultaneously exert forces 13 on the points indicated by the arrowheads. An external force 13 acting on the holder and its transmission to these points displaces the stator 12 and the feedthrough contacts 6 in the direction of the holding plate 11, thus inserting or pressing the stator 12 into the motor housing 8.

[0074] For example, while the stator 12 with the pre-assembled feedthrough contacts 6 is continuously pressed into the motor housing 8, the distance between the feedthrough contacts 6 and the corresponding holes in the motor housing 8 continues to decrease until the feedthrough contacts 6 are threaded into the holes as well as the insulating sleeves 9 arranged in the holes.

[0075] As the press-in process continues, the feedthrough contacts 6 reach the holes 5 of the corresponding busbars 1 and are pressed into these prefabricated holes 5. Due to the undersize of the holes 5, the feedthrough contacts 6 are contacted with the busbars 1 by means of a cold weld.

[0076] Once the holder has reached its final position, the press-fitting process is complete and both the stator 12 has been pressed into the motor housing 8 and the feedthrough contacts 6 have been pressed into the holes 5 of the busbars 1. The completed press-fitting process, in which the holder has reached its final position, is shown in the Fig. 7 shown.

[0077] The resulting unit, consisting of the motor housing 8, feedthrough contacts 6, and busbars 1, is removed from the mounting plate 11. This completes the press-fitting process, and an electrically conductive connection is established between the busbars 1, the feedthrough contacts 6, and the windings of the stator 12. Subsequently, a printed circuit board 10, for example, can be attached and soldered to the second ends 4 of the busbars 1.

[0078] In the Fig. Figure 8 shows a perspective view of a motor housing 8 with feedthrough contacts 6 and pressed-on busbars 1. In the illustration, three busbars 1 are arranged in corresponding channels provided in a motor housing 8, insulated from the motor housing 8. The busbars 1 each have a collar 7 at their first ends 3 in the area of ​​the hole 5 and are each shown pressed onto the associated feedthrough contact 6. The respective second ends 4 of the busbars 1 are bent at right angles and end next to each other in the upper left area of ​​the Fig. 8. It is intended to contact the thus prepared and arranged second ends 4 with a printed circuit board 10 (not shown). As shown in the Fig. As can be seen in Figure 8, the shape of the busbar can deviate from a straight line and be adapted to structural requirements. List of reference symbols 1, 1' power rail 2 spring contact sleeves 3 first end 4 second end 5 holes 6 Implementation contact 7 Collar / Edge 8 Engine housing 9 Insulation sleeve 10 circuit board 11 Holding plate 12 Stator 13 Force (F)

Claims

[1] Motor housing (8) of a compressor, wherein the motor housing (8) has a plurality of bores for receiving feedthrough contacts (6) and a stator (12), characterized by that a plurality of feedthrough contacts (6) are arranged in the bores, that a printed circuit board (10) with components necessary for controlling a motor is arranged, that busbars (1) are arranged between the feedthrough contacts (6) and the printed circuit board (10) in such a way that each busbar (1) is arranged with a first end (3) which has a hole (5) which is undersized compared to the diameter of the feedthrough contact (6) and is connected to an associated feedthrough contact (6), and that each busbar (1) is arranged with a second end (4) connected to the printed circuit board (10). [2] Motor housing (8) according to claim 1, characterized by that a collar (7) surrounding the hole (5) is arranged on the hole (5). [3] Motor housing (8) according to claim 1 or 2, characterized by that the hole (5) is round, oval, n-sided or in the shape of a cloverleaf. [4] Motor housing (8) according to one of claims 1 to 3, characterized by that the second end (4) of the busbar (1) is arranged at an angle of 30°, 45° or 90°. [5] Motor housing (8) according to one of claims 1 to 4, characterized by that the second end (4) of the busbar (1) is arranged connected to conductor tracks of a printed circuit board (10). [6] Method for contacting a feedthrough contact (6) of an electric motor, wherein a busbar (1) is electrically conductively connected to the feedthrough contact (6), characterized bythat a busbar (1) is provided which has a hole (5) at a first end (3) of the busbar (1) which is undersized compared to the diameter of the feedthrough contact (6), that the busbar (1) is provided positioned on a holding plate (11), and that the contacting of a feedthrough contact (6) of an electric motor with the hole (5) of the busbar (1) provided on the holding plate (11) takes place in one work step with a pressing-in of a stator (12) connected to the feedthrough contacts (6). [7] Method according to claim 6, characterized by that the busbar (1) is provided with a collar (7) surrounding the hole (5). [8] Method according to claim 6 or 7, characterized by that the busbar (1) is provided with a bend or kink for tolerance compensation. [9] Method according to one of claims 6 to 8, characterized bythat the busbar (1) is provided with a second end (4) angled at an angle of 30°, 45° or 90°. [10] Method according to claim 9, characterized by that the busbar (1) is contacted with its first end (3) via the feedthrough contact (6) with a stator winding of a motor and with its second end (4) with a conductor track of a printed circuit board (10), wherein the components required for controlling the motor, which provide an inverter circuit, are arranged on the printed circuit board (10).

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