DE102021211011A1 - Stator assembly and method of assembling a stator assembly - Google Patents

Abstract

The invention relates to a stator arrangement with a contact interface for representing an electrical connection of a stator unit to a contact unit, which comprises at least two contact receptacles with a circular receiving cross section for each one sleeve body on the stator side with an outer circumference that has assembly play relative to the circular receiving cross section of the associated contact receptacle. the contact receptacles are arranged on a contact pitch circle.To simplify the manufacture of the stator arrangement, one of the stator-side sleeve bodies has a centering geometry on its outer circumference, with the aid of which a stator axis of the stator unit is centered within the contact pitch circle of the contact unit during assembly.

Description

The invention relates to a stator arrangement with a contact interface for representing an electrical connection of a stator unit to a contact unit, which comprises at least two contact receptacles with a circular receiving cross section for each one sleeve body on the stator side with an outer circumference that has assembly play relative to the circular receiving cross section of the associated contact receptacle. wherein the contact receptacles are arranged on a contact pitch circle. The invention also relates to a method for assembling such a stator arrangement.

State of the art

From the German Offenlegungsschrift DE 10 2016 225 342 A1 a stator arrangement of an electrical machine with a housing and with a stator is known, which has a stator base body and at least one end winding, the stator base body and the end winding being cast in a heat-conducting epoxy resin.

Disclosure of Invention

The object of the invention is to produce a stator arrangement with a contact interface for establishing an electrical connection between a stator unit and a contact unit, which comprises at least two contact receptacles with a circular receptacle cross section, each for a stator-side sleeve body with an outer circumference that is relatively small relative to the circular receptacle cross section of the associated Contact has a mounting game, the contacts are arranged on a contact pitch circle to simplify.

The task is in a stator arrangement with a contact interface for representing an electrical connection of a stator unit to a contact unit, which comprises at least two contact receptacles with a circular receiving cross-section for a sleeve body on the stator side with an outer circumference that has assembly play relative to the circular receiving cross-section of the associated contact receptacle , The contacts being arranged on a contact pitch circle, solved in that one of the sleeve bodies on the stator side has a centering geometry on its outer circumference, with the aid of which a stator axis of the stator unit is centered during assembly within the contact pitch circle of the contact unit. During assembly, plug-in connections between the stator unit and high-voltage electronics are advantageously produced without tools. For example, three stator lines extend from a stator of the stator unit and are connected at the contact interface to high-voltage electronics that are accommodated in a common housing with the stator arrangement. The contact interface includes, for example, at least one further connection, which is advantageously also designed as a plug-in connection. The further connection serves, for example, to connect a sensor device assigned to the stator unit to the high-voltage electronics in terms of control. The assembly clearance may vary due to production. The correct assembly of the stator arrangement is considerably simplified by the centering geometry. Alignment features that would otherwise be required on individual parts of the stator arrangement can be dispensed with. In addition, simple assembly systems can be used in connection with the centering geometry. Contacting errors can be avoided.

A preferred exemplary embodiment of the stator arrangement is characterized in that the centering geometry is aligned transversely to a radial line that extends from the stator axis of the stator unit through a center point of the circular receiving cross section of the associated contact receptacle. Due to the centering geometry on exactly one of the sleeve bodies on the stator side, all sleeve bodies on the stator side are advantageously automatically and correctly aligned during assembly, that is to say when the plug connections are made. Complicated assembly devices can be dispensed with. As a result, the manufacturing costs can be effectively reduced.

A further preferred exemplary embodiment of the stator arrangement is characterized in that the centering geometry is firstly dimensioned in such a way that it performs its centering function even when there is maximum assembly play, and secondly it is deformable in such a way that assembly is also possible without tools when the assembly play is close to zero . In the ideal case, the stator unit is aligned with the contact unit without play. The claimed dimensioning and deformability of the centering geometry ensures correct alignment of the stator unit relative to the contact unit over the entire permissible tolerance range.

A further preferred exemplary embodiment of the stator arrangement is characterized in that the centering geometry is slightly oversized relative to the circular receiving cross section of the associated contact receptacle and can be deformed during assembly. This enables the stator unit to be aligned without play relative to the contact unit.

Another preferred exemplary embodiment of the stator arrangement is characterized in that the centering geometry has two centering ribs includes on the outer circumference of the stator-side sleeve body. The sleeve body with the centering ribs is formed from a plastic material, for example. This simplifies the production of the centering geometry. With the centering ribs, the sleeve body on the stator side can be correctly aligned in a simple manner when the plug-in connection is made in the associated contact receptacle.

Another preferred exemplary embodiment of the stator arrangement is characterized in that the centering ribs on the outer circumference of the sleeve body on the stator side are arranged diametrically across a radial line that extends from the stator axis of the stator unit through a center point of the circular receiving cross section of the associated contact receptacle. This is a simple way to ensure that the stator unit is correctly centered during assembly.

A further preferred exemplary embodiment of the stator arrangement is characterized in that the centering geometry has a conical introduction geometry. This greatly simplifies assembly when making the plug connections.

A further preferred exemplary embodiment of the stator arrangement is characterized in that the conical insertion geometry is dimensioned axially in such a way that a centering process is completed before sealing rings are pressed during assembly of the stator unit. The actual centering process begins at the end of the conical insertion geometry when the centering geometry performs its centering function. When pressing the sealing rings, a significantly greater assembly force is then applied after the centering process than during the centering process itself.

Another preferred exemplary embodiment of the stator arrangement is characterized in that the centering geometry on the outer circumference of the sleeve body on the stator side has the shape of an ellipse with a main axis that is arranged transversely to a radial line that extends from the stator axis of the stator unit through a center point of the circular receiving cross section of the associated contact extends. The elliptical centering geometry aligned in this way functions in the same way or similarly to the centering ribs described above.

In a method for assembling a stator arrangement as described above, the above-mentioned object is alternatively or additionally achieved in that the sleeve body on the stator side with the centering geometry is inserted into the associated contact receptacle in order to center the stator unit within the contact pitch circle of the contact unit. Automated assembly in large numbers is made possible with simple means.

The invention may also relate to a stator unit and/or a contact unit, in particular also individual parts of the stator unit or the contact unit of the stator arrangement described above, which can be sold separately.

The invention may also relate to a gas delivery device, in particular an air compressor, for providing a gas, in particular for providing compressed air, in a fuel cell system, with a stator arrangement as described above.

Further advantages, features and details of the invention result from the following description, in which various exemplary embodiments are described in detail with reference to the drawing.

character list

• 1 eine perspektivische Darstellung einer Luftzuführvorrichtung mit einem Gehäuse, in welchem eine Steueranschlusseinrichtung über Stromschienen mit einer Stromanschlusseinrichtung verbunden ist;
• 2 eine perspektivische Darstellung einer Kontaktschnittstelle zwischen einer Statoreinheit und einer Kontakteinheit der in 1 dargestellten Luftzuführvorrichtung;
• 3 einen vergrößerten Ausschnitt aus 1 mit einem statorseitigen Hülsenkörper, der an seinem Außenumfang eine Zentriergeometrie aufweist;
• 4 eine vergrößerte Darstellung eines Verbindungsabschnitts der Statoreinheit mit vier statorseitigen Hülsenkörpern in der Draufsicht;
• 5 eine vergrößerte perspektivische Darstellung eines der Hülsenkörper aus 4 mit einer Zentriergeometrie;
• 6 eine schematische Darstellung eines Hülsenkörpers mit einer Zentriergeometrie innerhalb einer Modulhülse; und
• 7 einen Längsschnitt durch einen statorseitigen Hülsenkörper mit einer Zentriergeometrie am Ende eines Zentriervorgangs.

Show it:

• 1 a perspective view of an air supply device with a housing in which a control connection device is connected to a power connection device via busbars;
• 2 a perspective view of a contact interface between a stator unit and a contact unit in 1 illustrated air supply device;
• 3 an enlarged section 1 with a sleeve body on the stator side, which has a centering geometry on its outer circumference;
• 4 an enlarged representation of a connection portion of the stator unit with four sleeve bodies on the stator side in plan view;
• 5 an enlarged perspective view of one of the sleeve bodies 4 with a centering geometry;
• 6 a schematic representation of a sleeve body with a centering geometry within a module sleeve; and
• 7 a longitudinal section through a sleeve body on the stator side with a centering geometry at the end of a centering process.

Description of the exemplary embodiments

In 1 an air supply device 1 is shown in perspective. The air supply device 1 is also referred to as an air compressor and is used in a mobile fuel cell system to provide compressed air. The mobile fuel cell system, in turn, is used in a motor vehicle equipped with the fuel cell system to provide electrical energy, which is converted into drive energy for the motor vehicle, for example via an electric motor.

The air supply device 1 comprises a multi-part housing 2 with an air connection 3, via which air is supplied, and with an air connection 4, via which compressed air is discharged. In order to compress the air, the air supply device 1 comprises, for example, a compressor wheel which can be rotated within a compressor volute.

The compressor wheel is driven by an electric motor which is arranged in the housing 2 . The electric motor includes a rotor rotatable within a stator.

The stator of the electric motor includes a power connection device 5, via which alternating current is supplied to the stator in three phases. The power connection device 5 is connected to a control connection device 6 via a connection device 10 which comprises three elongate contact parts 7 , 8 , 9 .

The control connection device 6 is combined, for example, with a cable outlet 40 which, as indicated by three outgoing cables 39, is connected to a separately arranged and in 1 not shown inverter is connected.

However, the inverter can also be integrated into the housing 2 of the air supply device 1 . The cable outlet 40 is then omitted. The claimed stator arrangement relates to an air supply device with an integrated inverter.

In the 2 until 7 shows how a stator arrangement 20 of the gas supply device, which is preferably designed as an air compressor, is connected at a contact interface 30 to high-voltage electronics 35, which represent the inverter integrated in the air compressor.

In the 2 and 7 it is indicated that a stator unit 28 comprises a stator 25 from which stator lines 21, 22, 23 emanate. The stator unit 28 also includes a cooling sleeve 24, which is used to cool the stator 25 during operation.

The stator lines 21 to 23, which emanate from the stator 25, are connected to the high-voltage electronics 35 at the contact interface 30 via high-voltage connections 31, 32, 33. A further connection 34 connects, for example, a sensor device assigned to the stator 25 to the high-voltage electronics 35.

The stator unit 28 also includes a centering device 38. The centering device 38 includes an annular body 46, with which the centering device 38 is mounted on the cooling sleeve 24. A connecting section 45 extends outwards in the radial direction from the annular body 46 of the centering device 38 .

Four connection sleeves 41 to 44 are formed on the connecting section 45 and essentially have the shape of straight circular cylinder jackets. The connecting sleeves 41 to 44 extend in the axial direction.

The term axial refers to an axis of rotation of a rotor rotatable with the stator 25 . Axial means towards or parallel to this axis of rotation. Analogously, the term radially means transversely to this axis of rotation. The axis of rotation of the rotor coincides with a stator axis 26 which is 2 is indicated.

A contact unit 60 is assigned to the connecting sleeves 41 to 44 at the contact interface 30 . The contact unit 60 includes a module sleeve 66 for each of the connecting sleeves 41 to 44. The module sleeves 66 have the shape of straight circular cylinder jackets with a circular receiving cross section 61, 62. The connecting sleeves 41 to 44 each include a sleeve body 51 to 54, which with play in a associated contact receptacle 61, 62 is accommodated, which are formed inside the module sleeves 66.

In 3 one can see that the sleeve body 52 of the connection sleeve 42 is received in the contact receptacle 62 of the module sleeve of the contact unit 60 with a play, which is also referred to as assembly play. A centering geometry 70 is formed on the outer circumference of the sleeve body 52 and serves to center the stator unit 28 relative to the contact unit 60 during assembly.

The contact unit 60 with the total of four module sleeves 66 represents an inverter-side connection module 64 which is fastened in the housing 2 of the air compressor, for example with the aid of screws.

In 4 the contact unit is indicated only by a contact pitch circle 48. Two centering ribs 71, 72 of the centering geometry 70 are arranged diametrically on the contact pitch circle 48 transversely to a radial line 68. The centering ribs 71, 72 of the centering geometry 70 facing away from one another serve to reduce the assembly clearance during assembly of the stator assembly tion 20 when the stator unit 28 is connected to the contact unit 60 by plug connections at the contact interface 30 .

In 5 one can see that the centering ribs 71, 72 are provided with a conical insertion geometry 56 at a free end of the sleeve body 52. The conical insertion geometry 56 simplifies the production of the plug-in connection during assembly.

The centering process takes place when the centering ribs 71, 72 come to rest on the inside of the contact receptacle 62 of the contact unit 60. During the centering process, an assembly force is generated in the axial direction, i.e. in 5 applied to the centering device 38 with the connecting section 45 from the left.

In 7 it is indicated that the centering process is completed before the stator-side sealing rings 77, 78, which are designed, for example, as O-rings, are pressed together with a significantly higher assembly force than during the centering process.

In 6 It is indicated schematically that the centering geometry 70 on an outer circumference of the sleeve body 52 can also have the shape of an ellipse 74 with a main axis 75 which is arranged transversely to the radial line 68 . Thus, in a manner similar to that with the centering ribs of the centering geometry 70, the assembly play can be compensated for during the centering process.

QUOTES INCLUDED IN DESCRIPTION

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

Patent Literature Cited

• DE 102016225342 A1 [0002]

Claims (10)

Stator arrangement (20) with a contact interface (30) for representing an electrical connection of a stator unit (28) to a contact unit (60), which has at least two contact receptacles (61, 62) with a circular receptacle cross-section, each for a sleeve body (51, 52, 53,54) with an outer circumference which has assembly play relative to the circular receiving cross-section of the associated contact receptacle (61,62), the contact receptacles (61,62) being arranged on a contact pitch circle (48), characterized in that one of the stator-side sleeve body (52) has a centering geometry (70) on its outer circumference, with the aid of which a stator axis (26) of the stator unit (28) is centered within the contact pitch circle (48) of the contact unit (60) during assembly. Stator arrangement according to claim 1 , characterized in that the centering geometry (70) is aligned transversely to a radial (68) which extends from the stator axis (26) of the stator unit (28) through a center point of the circular receiving cross section of the associated contact (62). Stator arrangement according to one of the preceding claims, characterized in that the centering geometry (70) is firstly dimensioned in such a way that it performs its centering function even with maximum assembly play, and secondly it is deformable in such a way that assembly is also possible without tools if the assembly play goes to zero. Stator arrangement according to one of the preceding claims, characterized in that the centering geometry (70) is slightly oversized relative to the circular receiving cross section of the associated contact receptacle (62) and can be deformed during assembly. Stator arrangement according to one of the preceding claims, characterized in that the centering geometry (70) comprises two centering ribs (71, 72) on the outer circumference of the sleeve body (52) on the stator side. Stator arrangement according to claim 5 , characterized in that the centering ribs (71,72) on the outer circumference of the sleeve body (52) on the stator side are arranged diametrically transverse to a radial line (68) which extends from the stator axis (26) of the stator unit (28) through a center point of the circular receiving cross section the associated contact (62) extends. Stator arrangement according to one of the preceding claims, characterized in that the centering geometry (70) has a conical insertion geometry (56). Stator arrangement according to claim 7 , characterized in that the conical insertion geometry (56) is dimensioned axially such that a centering process is completed before sealing rings (77, 78) are pressed during assembly of the stator unit (28). Stator arrangement according to one of the preceding claims, characterized in that the centering geometry (70) on the outer circumference of the sleeve body on the stator side has the shape of an ellipse (74) with a main axis (75) which is arranged transversely to a radial line (68) which extends from of the stator axis (26) of the stator unit (28) through a center point of the circular receiving cross section of the associated contact receptacle (62). Method for assembling a stator arrangement (20) according to one of the preceding claims, characterized in that the sleeve body (52) on the stator side with the centering geometry (70) is introduced into the associated contact receptacle (62) in order to position the stator unit (28) within the contact pitch circle ( 48) of the contact unit (60).

Images