Electric pump including a contact element for electrical grounding

Abstract

The present invention relates to an electric pump (100) comprising a drive device (10), a pump device (50), a control substrate (30), a housing (111), and a contact element (20). The drive device (10) has a rotor (12) capable of rotating about an X-axis and a stator (11). The pump device (50) is driven by the drive device (10). The housing (111) contains at least the drive device (10), the control substrate (30), and the pump device (50), the housing (111) being made of at least one conductive material. The control substrate (30) is provided with a pilot circuit for controlling the drive device (10) and a grounding cord. Furthermore, the contact element (20), consisting of a conductor, electrically connects the stator (11), the grounding cord of the control substrate (30), and the conductive material of the housing (111). Figure for abbreviation: Figure 1

Description

Title of the invention: Electric pump comprising a contact element for electrical grounding

[0001] The present invention relates to an electric pump, particularly an electric pump comprising a contact element more suitable for electrical grounding used in particular for an automobile.

[0002] Generally, a vehicle such as an automobile is equipped with an electric pump. The electric pump has various components such as a drive unit, a control substrate, a pumping device driven by the drive unit, and a housing. The drive unit is powered by an external power source and controlled by a control substrate.

[0003] Often, in an electric pump, the drive device is an electric motor having a stator and a rotor. The electromagnetic field generated in the stator affects the electronic components of the control substrate. In order to protect the control substrate from the electromagnetic field and to comply with regulations regarding low electromagnetic compatibility, it is known to connect the stator to a path with low electrical resistance, so that an electrical connection to a ground potential is established. This is known as electromagnetic compatibility.

[0004] Under certain circumstances, the conductive material of the housing used to cover the control substrate, or the control substrate itself, generates a static electric current that has the potential to affect the performance of electronic components such as sensors in the control substrate and cause the electronic components to deviate from their intended operation. In order to protect the electronic components of the control substrate from the generated static electric current, it is known to suppress the generated static electric current by connecting the control substrate to a low electrical resistance path, so that the static electric current is discharged to ground potential. This is known as electrostatic discharge.

[0005] The electric pump for automobiles is compact in design. It is difficult to provide a grounding system within this compact design. In such an electric pump, it is necessary to create an electrical grounding connection to eliminate static electric current and ensure electromagnetic compatibility and the electrostatic discharge path. Many prior art works address the electrostatic discharge path and grounding for the electromagnetic compatibility of the electric pump. In an automobile, Many other components with a motor and control substrate, such as clutch actuators, disconnect actuators, and parking lock actuators, require an electrical grounding connection to eliminate static electricity and ensure electromagnetic compatibility and electrostatic discharge paths. In most cases, these are complex connections for electromagnetic compatibility and electrostatic discharge paths, leading to complex assembly and an increased assembly process, thus increasing assembly time and cost.

[0006] Therefore, it is necessary to solve the technical problem associated with the assembly explained above.

[0007] An object of the present arrangement is therefore to provide an assembly which overcomes the aforementioned disadvantages and other disadvantages of known arrangements and to provide an electric pump maintaining an electrical grounding by means of a contact element consisting of a conductor.

[0008] The present arrangement relates to an electric pump for an automobile, comprising a drive device having a rotor that can rotate about an X-axis and a stator, a pump device driven by the drive device, a control substrate having a pilot circuit for controlling the drive device and a grounding cord, a contact element consisting of a conductor, a housing containing at least the drive device, the control substrate, and the pump device, the housing being formed of at least one conductive material. According to the invention, the contact element electrically connects the stator, the grounding cord of the control substrate, and the conductive material of the housing.

[0009] An advantage of configuring the contact element in the form of a conductor is to create an integrated grounding path for the stator and the grounding cord of the control substrate with the conductive material of the housing.

[0010] The integrated grounding path for the flow of static electric current is defined by the combination of two individual functions: providing an electrical connection for electromagnetic compatibility (hereinafter referred to as EMC throughout) from the stator and an electrostatic discharge path (hereinafter referred to as DES throughout) from the grounding cord of the control substrate to the conductive material of the electric pump housing by means of a contact element consisting of a conductor. The EMC connection is between the stator and the grounding cord of the control substrate to the conductive material of the housing. The DES connection is between the grounding cord of the control substrate and the conductive material of the housing.

[0011] Consequently, this reduces the space occupied, the manufacturing cost, the logistics and the assembly cost associated with the parts used to make complex connections for the EMC connection and the DES path, which makes it possible to reduce assembly time.

[0012] According to one aspect of the arrangement, the contact element has a first base extending at least partially in a plane P1 electrically connecting the stator, a second base extending at least partially in a plane P2 electrically connecting the grounding cord of the control substrate, and a third base extending at least partially in a plane P3 electrically connecting to the conductive material of the housing, the planes P1, P2, and P3 being parallel to each other. Consequently, the control element is configured to be elastically deformable, which stores energy and dampens mechanical vibrations, thereby improving mechanically pressed contact and creating an integrated grounding path for the stator and the grounding cord of the control substrate with the conductive material of the housing.

[0013] According to another aspect of the arrangement, the second base has at least one wing. Consequently, the contact element having at least one wing increases the surface area of ​​the contact element on the control substrate for improved mechanical support.

[0014] According to another aspect of the arrangement, at least parts of the first base, the second base, and the third base are stacked one above the other. As a result, the total space required to house the control element is reduced.

[0015] According to another aspect of the arrangement, the first and third bases are offset from each other. Consequently, due to this offset arrangement between the first and third bases of the contact element, the surface area of ​​the second base of the contact element on the control substrate increases, thereby providing improved mechanical support.

[0016] According to another aspect of the arrangement, the control substrate has a grounding motif connected to the grounding cord of the control substrate. Consequently, the grounding motif having a connection to the grounding cord facilitates the flow of static electric current from different parts of the circuits in the control substrate.

[0017] According to another aspect of the arrangement, the housing has a housing body made at least partially of an insulating material and a cover body made at least partially of the conductive material. Consequently, the cover body made of the conductive material serves to ground the static electric current from the grounding cord of the control substrate and the electromagnetic field generated from the stator.

[0018] According to another aspect of the arrangement, the conductive material of the cover body includes a cover pin, the cover pin being connected to the contact element. Consequently, the cover pin protruding from the cover body guides and simplifies the assembly process.

[0019] According to another aspect of the arrangement, the electrical connection between the grounding cord and the contact element is a braze or a mechanical contact. Consequently, movement of the contact element, or any change in its position, is eliminated when the contact element is firmly fixed to the grounding cord of the control substrate, thereby improving the mechanical support for an electrical connection.

[0020] According to another aspect of the arrangement, the contact element and the stator are connected by welding. Consequently, movement of the contact element, or any change in its position, is eliminated when the contact element is firmly fixed to the stator, thus improving mechanical support.

[0021] According to another aspect of the arrangement, the contact element has a double Z or S shape.

[0022] According to another aspect of the arrangement, the stator has at least one pin for electrical connection to the contact element. Consequently, at least one pin of the stator guides and simplifies the assembly process.

[0023] The present arrangement can be better understood with reference to the following description and drawings. The components in the figures are not necessarily to scale, the emphasis being rather on illustrating the principles of the arrangement. Furthermore, in the figures, identical reference numbers designate corresponding parts. In the drawings:

[0024] Fig. 1 illustrates a cross-section of an electric pump comprising a contact element, configured according to the present invention;

[0025] [Fig.2] illustrates a cross-section of another arrangement of the electric pump comprising the contact element, configured according to the present invention.

[0026] Fig. 3A illustrates a perspective view of a first embodiment of the contact element configured according to the present invention.

[0027] Fig. 3B illustrates a cross-section of the first embodiment of the contact element provided with the control substrate, configured according to the present invention.

[0028] Fig. 3C illustrates a cross-section of an arrangement of the first embodiment of the contact element provided with the control substrate, the stator and the conductive material of the housing, configured according to the present invention.

[0029] Fig. 4A illustrates a perspective view of a second embodiment of the contact element configured according to the present invention.

[0030] Fig. 4B illustrates a cross-section of the second embodiment of the contact element provided with the control substrate, configured according to the present invention.

[0031] Fig. 4C illustrates a cross-section of another arrangement of the second embodiment of the contact element provided with the control substrate, the stator and the conductive material of the housing, configured according to the present invention.

[0032] Fig. 5 illustrates a perspective view of the first embodiment of the contact element provided with the control substrate, configured according to the present invention.

[0033] Figure 6 illustrates a perspective view of the second embodiment of the contact element provided with the control substrate, configured according to the present invention.

[0034] In the following description, reference is made to accompanying drawings, which form part thereof, and in which specific embodiments in which the invention can be applied are illustrated. These embodiments are described in sufficient detail to enable a person skilled in the art to carry out the invention, and it will be understood that the embodiments can be combined or that other embodiments can be used and that structural and logical modifications can be made without departing from the scope of the present invention. The following detailed description should therefore not be interpreted as limiting, and the scope of the present invention is defined by the accompanying claims and their equivalents.Furthermore, the grounding cord, the grounding pattern, and the cover pin are not shown in the illustrated figures.

[0035] Fig. 1 illustrates a cross-section of an electric pump comprising a contact element, configured according to the present invention, and Fig. 2 illustrates a cross-section of another arrangement of the electric pump comprising the contact element, configured according to the present invention.

[0036] The present description refers to [Fig.1] and [Fig.2] described in a common way for reasons of clarity.

[0037] The electric pump 100, comprising a contact element 20, configured according to the present invention, includes a drive device 10, a pump device 50, and a control substrate 30, which are mounted on a housing 111. The electric pump 100 is used to circulate a fluid in an automobile. In a non-limiting example, the fluid is an oil used in the automobile's transmission.

[0038] The drive device 10 is configured as an internal rotor motor arrangement comprising a stator 11 and a rotor 12. The rotor 12 is received inside of the stator 11, leaving an annular gap that facilitates the rotation of the rotor 12 around an X-axis. The rotor 12 is mounted on a rotor shaft. The stator 11 further includes at least one pin 13, as illustrated in [Fig. 2]. This at least one pin 13 of the stator 11 is a projection from the stator 11 in one piece. In another example, this at least one pin 13 of the stator 11 is a separate part attached to the stator 11 by welding or by mechanical connection. The pump device 50 includes a wheel 52. The pump device 50 is in a drive connection with the rotor 12. The drive connection implies that the rotor 12 of the drive device 10 and the wheel 52 of the pump device 50 are aligned coaxially and, in a non-limiting example, the wheel 52 is mounted on the rotor shaft of the drive device 10. The drive device 10 drives the wheel 52 of the pump device 50.In one example, the electric pump is a gerotor pump, a vane pump, or a gear pump.

[0039] The control substrate 30 has an insulating substrate with conductive paths connecting various electronic components, a driver circuit (not shown) for controlling the drive device, and a grounding pattern (not shown) and associated electrical connection (not shown) for distributing the required power supply to the drive device 10. The control substrate 30 further includes a grounding cord (not shown). In one example, the grounding cord (not shown) is electrically connected to the grounding pattern (not shown). The grounding pattern (not shown) is arranged on the control substrate 30, providing a path for the flow of static electric current from different parts of the circuits in the control substrate 30.

[0040] The housing 111 is formed at least partially of a conductive material and configured with individual portions to house the drive device 10, the pump device 50, and the control substrate 30 individually. In a non-limiting example as illustrated in [Fig. 1], the housing 111 is configured with a housing body 112 and a cover body 113. The housing body 112 has a portion for the drive device and a portion for the pump. The portion for the drive device houses the drive device 10 and the control substrate 30 as well as the contact element 20, and the portion for the pump houses the pump device 50. In yet another example, the housing body 112 is made at least partially of an insulating material, and the cover body 113 is made at least partially of the conductive material.In yet another example, the cover body 113 has a cover pin (not shown) that is electrically connected to the contact element 20. The cover pin is integrated into the cover body 113 of the housing 111 as a single piece. In a . Another example is the cover pin, which is a separate part attached to the cover body 113 by welding or by connection in a mechanical way.

[0041] In a non-limiting example, the conductive material of the housing 111 is preferably aluminum or steel. However, the conductive material may be made of other materials provided that the material has a certain degree of electrical conductivity.

[0042] The contact element 20 is configured as a conductor and is in electrical connection with the stator 11, the grounding cord of the control substrate 30 and the conductive material of the housing 111 constituting an integrated grounding path for the stator 11 and the grounding cord of the control substrate 30 with the conductive material of the housing 111 of the electric pump 100.

[0043] Fig. 3A illustrates a perspective view of a first embodiment of the contact element 20, Fig. 3B illustrates a cross-section of the first embodiment of the contact element 20 provided with the control substrate 30, Fig. 4A illustrates a perspective view of a second embodiment of the contact element 20, Fig. 4B illustrates a cross-section of the second embodiment of the contact element 20 provided with the control substrate 30, configured according to the present invention.

[0044] The present description refers to [Fig.3A], [Fig.3B], [Fig.4A] and [Fig.4B] described in a common way for reasons of clarity.

[0045] The contact element 20 consists of a conductor having conductivity, for example, a metallic element. In a non-limiting example, the metallic element is stainless steel having elastic properties. The elastic property implies that the metallic element is capable of storing energy and damping mechanical vibrations by elastic deformation. However, the contact element 20 can be made of other elements provided that the element has the elastic property. In one example, the contact element 20 is formed by bending the metallic element into a configuration according to the present invention. Thus, the manufacture of the contact element 20 is simpler. In one example, the metallic element is a metal strip.

[0046] The contact element 20 has a first base 21, a second base 22, and a third base 23. The first base 21 extends at least partially in a plane PI, the second base 22 extends at least partially in a plane P2, and the third base 23 extends at least partially in a plane P3. The planes PI, P2, and P3 are parallel to each other. Thus, the first base 21 extending in the plane PI, the second base 22 extending in the plane P2, and the third base 23 extending in the plane P3 are arranged one above the other.

[0047] The first base 21 is intended to have a first electrical connection with the stator 11, in a non-limiting example of the conductive material of the stator 11. The second base 22 is intended to have a second electrical connection with the grounding cord of the control substrate 30. The third base 23 is intended to have a third electrical connection with the conductive material of the housing 111. In another example, the first base 21 is intended to have a first electrical connection with at least one pin 13 of the stator 11.

[0048] According to the preferred example, the contact element 20 is assembled to have an electrical connection between the stator 11, the grounding cord of the control substrate 30 and the conductive material of the housing 111. In one method of mounting the contact element 20: the second base 22 of the contact element 20 is brazed onto the grounding cord of the control substrate 30. Consequently, when the contact element 20 is assembled as described above, the first base 21 is pressed against at least one pin 13 of the stator 11 and is therefore brought to be applied with a pushing force against at least one pin 13 of the stator 11 as seen in [Fig.3C] and [Fig.4C].

[0049] In a similar manner, the third base 23 is pressed against the conductive material of the cover body 113 of the housing 111 and is thus brought to be applied with a pushing force against the conductive material of the cover body 113 of the housing 111 as seen in [Fig.3C] and [Fig.4C].

[0050] In a non-limiting arrangement, the thrust force from the first base 21 is applied directly against the stator 11. In another arrangement, the thrust force from the third base 23 is applied against the cover pin (not shown) of the cover body 113.

[0051] Consequently, one of the mechanically pressed fits of the contact element 20 is created between the control substrate 30 and the stator 11 and the other mechanically pressed fit of the contact element 20 is between the control substrate 30 and the housing 111 by the elastic deformation of the contact element 20. Thus, the electrical connection of the contact element 20 with the stator 11, the grounding cord of the control substrate 30 and the conductive material of the housing 111 is ensured by the mechanically pressed fit.

[0052] In one example, the first electrical connection via the first base 21 with the stator 11, the second electrical connection via the second base 22 with the grounding cord of the control substrate 30, and the third electrical connection via the third base 23 with the conductive material of the housing 111 are made through the mechanical press fit ensuring a temporary connection.

[0053] In another example, at least one of the electrical connections is permanently connected while the other two electrical connections are connected temporarily. In a non-limiting example such as described above, the second electrical connection through the second base 22 with the grounding cord of the control substrate 30 is permanently connected while the other two electrical connections, namely the first electrical connection through the first base 21 with the stator 11 and the third electrical connection through the third base 23 with the conductive material of the housing 111, are temporarily connected.

[0054] The electrical connection is established between the stator 11 and the grounding cord of the control substrate 30 via the first base 21 and the second base 22, thereby improving the EMC of the electric pump 100.

[0055] In one example, the static electric current from the control substrate 30 flows through the second base 22 and the third base 23 to the conductive material of the housing 111 and this constitutes the DES path from the grounding cord of the control substrate 30.

[0056] Accordingly, the arrangement described above constitutes the integrated grounding path for the circulation of static electric current by combining two individual functions of supplying the electrical connection for EMC from the stator 11 and the DES path from the grounding cord of the control substrate 30 with the conductive material of the housing 111 of the electric pump 100 by means of the contact element 20 made of a conductor.

[0057] In one embodiment, the first base 21 and the third base 23 are offset from each other. Figures 3A, 3B, and 3C illustrate such an embodiment.

[0058] As illustrated in [Fig. 3A] and [Fig. 3B], the first base 21 and the third base 23 are offset from each other. The first base 21 extending in the PI plane has a first axis Al that extends normally to the first base 21. In a similar configuration, the third base 23 extending in the P3 plane has a third axis A3 that extends normally to the third base 23. The first axis Al and the third axis A3 are parallel to each other; in other words, the first axis Al and the third axis A3 are not coaxial. The first axis Al is at a distance from the third axis A3. The offset arrangement is defined by the distance between the first axis Al and the third axis A3.

[0059] Figure 5 illustrates such an offset arrangement of the contact element 20. The second base 22 of the contact element 20 is placed on the control substrate 30. In one example (not shown), the second base 22 is electrically connected to the grounding cord of the control substrate 30 by soldering for a permanent connection.

[0060] Figure 3C illustrates a cross-section of an arrangement of the first embodiment of the contact element 20 provided with the control substrate 30, of the stator 11 and the conductive material of the housing 111, configured according to the present invention. In a non-limiting example as illustrated in [Fig. 3C], the control substrate 30 is placed between the stator 11 (not shown in [Fig. 3C]) and the cover body 113. The contact element 20 is arranged between the stator 11 (not shown in [Fig. 3C]) and the cover body 113, which ensures the mechanical press fit such that the first base 21 is electrically connected to at least one pin 13 of the stator 11 (not shown in [Fig. 3C]), the third base 23 is electrically connected to the conductive material of the cover body 113, and the second base 22 is electrically connected to the grounding cord of the control substrate 30.

[0061] In one embodiment, the first base 21, the second base 22 and the third base 23 are one above the other and the second base 22 has at least one wing 221. [Fig.4A], [Fig.4B] and [Fig.4C] illustrate such an embodiment.

[0062] As illustrated in [Fig. 4A] and [Fig. 4B], the second base 22 extending in plane P2 has a first wing 221 and a second wing 222 extending in plane P2 from the second base 22. The first base 21, the second base 22 and the third base 23 are one above the other and have a second axis A2 which extends normally to the first base 21, the second base 22 and the third base 23. In other words, the first base 21, the second base 22 and the third base 23 are coaxial to the second axis A2.

[0063] Figure 6 illustrates such an embodiment of the contact element 20. The second base 22 of the contact element 20 has the first wing 221 and the second wing 222. The first wing 221 and the second wing 222 are placed on the control substrate 30. In one example (not shown), the first wing 221 and the second wing 222 of the second base 22 are electrically connected to the grounding cord of the control substrate 30 by soldering for the permanent connection.

[0064] Fig. 4C illustrates a cross-section of an arrangement of the second embodiment of the contact element 20 provided with the control substrate 30, the stator 11 and the conductive material of the housing 111, configured according to the present invention. In a non-limiting example such as illustrated in [Fig.4C], the control substrate 30 is placed between the stator 11 (not shown in [Fig.4C]) and the cover body 113. The contact element 20 is arranged between the stator 11 (not shown in [Fig.4C]) and the cover body 113, which ensures the mechanical press fit such that the first base 21 is in electrical connection with at least one pin 13 of the stator 11 (not shown in [Fig.4C]) and the third base 23 is in electrical connection with the conductive material of the cover body 113 and the second base 22 is in electrical connection with the grounding cord of the control substrate 30.

[0065] In one example, at least the first base 21 of the contact element 20 is permanently connected to the stator 11 by welding, while the second base 22 is temporarily connected by a mechanical press fit to the grounding cord of the control substrate 30, and the third base 23 is temporarily connected by a mechanical press fit to the conductive material of the housing 111. In a non-limiting example, the first base 21 is permanently connected to at least one pin 13 of the stator 11 by welding. In yet another example, the third base 23 is temporarily connected to the conductive material of the cover body 113 of the housing 111. In yet another example, the third base 23 is temporarily connected to the cover pin of the cover body 113.

[0066] In another example, at least the second base 22 of the contact element 20 is permanently connected to the grounding cord of the control substrate 30 by brazing, while the first base 21 is temporarily connected by the mechanical press fit to the stator 11 and the third base 23 is temporarily connected by the mechanical press fit to the conductive material of the housing 111. In a non-limiting example, the first base 21 is temporarily connected by the mechanical press fit to at least one pin 13 of the stator 11. In another example, the third base 23 is temporarily connected by the mechanical press fit to the conductive material of the cover body 113 of the housing 111. In yet another example, the third base 23 is temporarily connected by the mechanical press fit to the cover pin of the cover body 113.

[0067] However, a combination of the above arrangement is possible, consequently at least one of the electrical connections is permanently connected while the other two electrical connections are temporarily connected.

[0068] In a non-limiting example as shown in [Fig.1] to [Fig.6], the contact element 20 is configured so as to have a double Z shape formed in one piece, in which the first Z shape has the third base 23 in plane 3 and the second base 22 in plane P2, while the second Z shape extends in one piece from the second base 22 in plane 2 and has the first base 21 in plane PI to form the second Z shape, when viewed in a lateral direction. In other words, the second base 22 in the P2 plane forms a common part for the double Z shape. The first base 21 and the second base 22 are connected by the fact that they have a connecting element 24 which extends inclinedly at an angle with respect to the PI and P2 planes; in a similar configuration, the second base 22 and the third base 23 are connected.In an embodiment that is not shown, the connection element 24 extends in a way. normal to plane PI to form an S-shape of the contact element 20. However, the connecting element 24 can have any shape as long as it is configured to apply the thrust force on it with a determined compression. In such a way that the contact element 20 applies the thrust force on it with the determined amount of compression between the stator 11 and the grounding cord of the control substrate 30 and between the grounding cord of the control substrate 30 and the conductive material of the housing 111.

[0069] However, the control element 20 can have any shape within the scope of the invention, provided that it forms an integral grounding path by making the electrical connection to the stator 11, the grounding cord of the control substrate 30, and the conductive material of the housing 111 to produce the electrical connection for EMC and the DES path. Due to elastic deformation to store energy and dampen mechanical vibrations, this improves contact with mechanically pressed fit and ensures contact of the contact element 20 between the stator 11, the control substrate 30, and the conductive material of the housing 111.

Claims

Demands

1. Electric pump (100) for an automobile, comprising: a drive device (10) having a rotor (12) capable of rotating about an X axis and a stator (11); a pump device (50) driven by the drive device (10); a control substrate (30) having a pilot circuit for controlling the drive device (10) and a grounding cord; a contact element (20) made of a conductor; a housing (111) housing at least the drive device (10), the control substrate (30) and the pump device (50), the housing (111) being formed of at least one conductive material; characterized in that the contact element (20) electrically connects the stator (11), the grounding cord of the control substrate (30) and the conductive material of the housing (111).

2. Electric pump (100) according to claim 1, wherein the contact element (20) has a first base (21) extending at least partially in a plane PI connecting the stator (11) electrically, a second base (22) extending at least partially in a plane P2 connecting the grounding cord of the control substrate (30) electrically and a third base (23) extending at least partially in a plane P3 connected to the conductive material of the housing (111) electrically, the planes PI, P2 and P3 being parallel to each other.

3. Electric pump (100) according to claim 2, wherein the second base (22) has at least one wing (221).

4. Electric pump (100) according to claim 2 or 3, wherein at least parts of the first base (21), second base (22) and third base (23) are one above the other.

5. Electric pump (100) according to claim 2 or 3, wherein the first base (21) and the third base (23) are offset from each other.

6. Electric pump (100) according to any one of the preceding claims, wherein the control substrate (30) has a grounding pattern connected to the grounding cord of the control substrate (30).

7. Electric pump (100) according to any one of the preceding claims, wherein the casing (111) has a casing body (112) made at least partially of an insulating material and a cover body (113) made at least partially of the conductive material.

8. Electric pump (100) according to claim 7, wherein the conductive material of the cover body (113) comprises a cover pin, the cover pin being connected to the contact element (20).

9. Electric pump (100) according to any one of the preceding claims, wherein the electrical connection between the grounding cord and the contact element (20) is a braze or a mechanical contact.

10. Electric pump (100) according to any one of the preceding claims, wherein the contact element (20) and the stator (11) are connected by welding.

11. Electric pump (100) according to any one of claims 2 to 4, wherein the contact element (20) has a double Z or S shape.

12. Electric pump (100) according to any one of claims 1 to 11, wherein the stator (11) has at least one pin (13) for electrical connection to the contact element (20).

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