Stator with pins and interface for electric machine

Abstract

A stator (1) for an electric motor (100) comprises: a plurality of pins (11, 12, 13, 14, 21, 22, 23, 24, 31, 32, 33, 34) arranged on at least two concentric circles; and an interface (10, 20, 30) having at least one contact surface (19, 29, 39) connected to two conductive legs (10a, 10b, 20a, 20b, 30a, 30b) and supported by the legs, wherein the legs are connected to at least one pin on different concentric circles.

Description

[0001] Cross Reference to Related Applications

[0002] This application claims priority to and the benefit of German Patent Application No. 10 2019 105 563.6, filed March 5, 2019, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present invention relates to a stator with pins and an interface for an electric machine, in particular an electric motor. BACKGROUND

[0004] Electric machines are well known and are increasingly used in the form of electric motors for the drive of vehicles. An electric machine consists of a stator and a rotor.

[0005] The stator comprises a plurality of slots in which windings are guided. The windings can be formed from insulated copper bars in the form of so-called pins. The rotor is located in the stator and is connected to a rotor shaft. SUMMARY

[0006] It is an object of the present invention to provide an interface at a stator with compact and robust pins.

[0007] According to the invention, a stator for an electric machine comprises a plurality of pins arranged on at least two concentric circles and an interface with at least one contact surface connected to and supported by two electrically conductive legs, wherein the legs are connected to at least one pin on a different concentric circle.

[0008] By means of the legs on each side of the interface, the contact surface is supported on the stator, so that a fixed point for connecting a phase conductor from an inverter can be provided.

[0009] In a further embodiment of the invention, the pins are located on concentric circles in an inner region of the stator and on concentric circles in an outer region of the stator.

[0010] Since the interface is connected only to pins on the outer concentric circles and the inner concentric circles, the interface can span between the pins on the concentric circles.

[0011] One leg can preferably have a twist between the pin and the contact surface.

[0012] Thanks to the twist, the insulation distance between the leg and the other pins is maintained without impairing the stability of the leg.

[0013] In a specific embodiment of the invention, the twist can be in the axial and radial direction of the stator.

[0014] By means of the torsion in both directions, the stability of the legs is further improved.

[0015] In a further embodiment of the application, the torsion of the torsion portion in axial and radial direction can be in the range of 80 to 100 degrees, relative to the starting position of the leg.

[0016] In this range, both the insulation distance and the stability are sufficient.

[0017] The at least one leg can preferably be connected to the at least two pins at the end facing away from the interface.

[0018] Furthermore, by means of the connection of the two pins, the interface can additionally be adapted in a universal manner to different winding patterns.

[0019] The leg can further preferably be bent at an angle of 80 to 100 degrees, in particular at a right angle, between the torsion portion and the end facing away from the interface.

[0020] Due to the bending in the direction of the pins to be contacted, the leg can extend over the pins not to be contacted and doing so can increase the insulation distance.

[0021] In a further embodiment of the application, the interface can have a recess at the contact face for contacting the pins or the contact screw.

[0022] The interface can have an internal thread for contacting the contact screw. The internal thread holds the contact screw and is supported by the leg on the stator. Thus, a stable connection between the stator pins and the inverter can be created.

[0023] In a preferred embodiment, in the case where the contact face is located between the two legs, the two legs can each be bent substantially 90 degrees relative to the contact face.

[0024] The interface with the contact face is located between the two legs, thus the two legs have a small overall height on the stator, while holding the interface above the stator in a sufficiently stable manner.

[0025] The legs can preferably not protrude into the interior (I) or the exterior (A) of the stator (1).

[0026] The interior of the stator is thus free for the rotor. In particular, there is no spatial conflict between the rotor and the stator during assembly of the rotor in the stator.

[0027] The exterior of the stator is thus free for the housing. In particular, there is no spatial conflict between the stator and the housing during assembly of the stator in the housing.

[0028] More preferably, the conductor can connect selected pins below the interface.

[0029] For example, the conductors connect the coils to a common star point under the interface. A space-saving star point connection can thus be produced.

[0030] According to the application, the vehicle (103) has an electric machine which has a stator according to one of the preferred embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 A stator with an interface for connecting an inverter is shown.

[0032] Figure 2 A plan view of a stator with an interface for connecting an inverter is shown.

[0033] Figure 3 An exemplary embodiment of an interface is shown.

[0034] Figure 4 Another exemplary embodiment of an interface is shown.

[0035] Figure 5 Yet another exemplary embodiment of an interface is shown.

[0036] Figure 6 A plan view of a stator with a star point connector is shown.

[0037] Figure 7 A vehicle with an electric machine, in particular an electric motor, is shown, the electric machine having a stator with an interface. DETAILED DESCRIPTION

[0038] Figure 1 The stator 1 in Fig. 1 has a plurality of pins which are electrically conductive connected to one another in sections and form coils around the stator teeth. For example, a rotor can be arranged in the inner region of the stator and a housing can be arranged in the outer region of the stator.

[0039] The stator 1 has three interfaces 10, 20, 30. Each interface has a leg 10a, 20a, 30a in the direction of the outer region of the stator and additionally a leg 10b, 20b, 30b in the direction of the inner region of the stator.

[0040] The legs 20b, 30b of the inner region of the stator have axial and radial twists 25, 35. The legs 20b, 30b of the inner region of the stator also have a bend 26, 36 in the direction of the pins at the end facing the stator. The legs 10b, 20b, 30b of the inner region of the stator also have an elbow 17, 27, 37.

[0041] The star point connector 41 connects the pins 41a, 41b, 41c. The star point connector 43 arranged above connects the pins 43a, 43b, 43c. The star point connectors extend in different planes, so the pins contacting them can also have different lengths.

[0042] In Figure 2 , the stator 1 is shown in plan view, the stator 1 having Figure 1 the interfaces 10, 20, 30 and the star point connectors 41, 43. It can be seen that the stator interior I facing the rotor and the stator exterior A facing the housing. The three interfaces 10, 20, 30 form defined connection points for the inverter.

[0043] The interface 10 is connected via the leg 10a of the stator exterior region to the pins 11a and 12a shown in hatching. In addition, the interface 10 is connected via the leg 10b of the stator interior region to the pins 13a and 14a shown in hatching.

[0044] The pins 11a, 12a of the stator exterior region lie on a different concentric circle than the two pins 13a, 14a of the stator interior region.

[0045] The interface 20 likewise has a leg 20a of the stator exterior region, which is connected to the pin 21a shown in hatching and to another pin (not shown) lying below the interface 10. The leg 20b of the stator interior region of the interface is connected to the pins 23a and 24a shown in hatching.

[0046] The interface 30 likewise has a leg 30a of the stator exterior region, which is connected to the pins 31a and 32a shown in hatching. The leg 30b of the stator interior region of the interface 30 is connected to the pins 33a and 34a shown in hatching.

[0047] The legs 20b, 30b of the interfaces 20, 30 lie in the interior region of the stator, each leg having a twist 25, 35. This twist is arranged both radially relative to the center point of the stator and axially along the rotor axis. The two legs 20b and 30b in the interior region of the stator also have a bend before contacting the pins, which is shown more clearly in Figure 4 and Figure 5 .

[0048] Below the interfaces 10, 20, 30, the stator has the so-called star point connectors 41, 43 arranged in different planes. The coils formed by the connected pins thus have a star point.

[0049] The star point connector 41 connects the pins 41a, 41b, 41c. The star point connector 43 located above connects the pins 43a, 43b, 43c. The star point connectors extend in different planes, so the pins contacting them can also have different lengths.

[0050] In Figure 3 , an interface 10 is shown having a leg 10a of the stator outer region and a leg 10b of the stator inner region. The leg 10a of the stator outer region has an elbow 17a in the direction of the contact points 11, 12 for the pins. The leg 10b of the stator inner region has two elbows 17b in the direction of the contact points 13, 14 for the pins. Both legs 10a, 10b can also have deflections 10c, 10d in the direction of the contact faces.

[0051] In Figure 4 , an interface 20 is shown having a leg 20a of the stator outer region and a leg 20b of the stator inner region. The leg 20a of the stator outer region has an elbow 27a in the direction of the contact points 21, 22 for the pins. Before the contact points, the leg 20a of the stator outer region is bent with a bend 26a.

[0052] The leg 20b of the stator inner region has a twist 25 in the transverse and axial direction with respect to the stator, and in addition, the leg 20b of the stator inner region has an elbow 27b in the direction of the contact points 23, 24 for the pins. Before the contact points, the leg 20b of the stator inner region is bent with a bend 26b. Both legs 20a, 20b can also have deflections 20c, 20d in the direction of the contact faces 29.

[0053] In Figure 5 , an interface 20 is shown having a leg 20a of the stator outer region and a leg 20b of the stator inner region. The leg 20a of the stator outer region has an elbow 27a in the direction of the contact points 21, 22 for the pins. Before the contact points, the leg 20a of the stator outer region is bent with a bend 26a.

[0054] The leg 20b of the stator inner region has a twist 25 in the transverse and axial direction with respect to the stator, and in addition, the leg 20b of the stator inner region has an elbow 27b in the direction of the contact points 23, 24 for the pins. Before the contact points, the leg 20b of the stator inner region is bent with a bend 26b. Both legs 20a, 20b can also have deflections 20c, 20d in the direction of the contact faces 29.

[0055] Figure 6A plan view of the stator 1 without the interface is shown. The stator has a plurality of pins and four star point connectors 41, 43, 45, 47. Each star point connector is connected to three pins (reference numerals star point connector and a, b, c).

[0056] The pins differ in length, wherein the three pins connected by a star point connector have equal length. Each pin connected by a star point connector represents an end of a coil, thus the star point connectors form a star point of three connected coils. The star point connectors can likewise be connected to each other, thus multiple star points can be at the same potential.

[0057] Figure 7 is a schematic view of an exemplary embodiment of a vehicle 103, for example a hybrid vehicle or an electric vehicle, comprising an electric machine 100, in particular an electric motor, having an exemplary embodiment of a stator 1 for driving the vehicle 103.

Claims

1. A stator (1) for an electric motor (100), comprising: - a plurality of pins (11, 12, 13, 14, 21, 22, 23, 24, 31, 32, 33, 34) arranged on at least two concentric circles; and - an interface (10, 20, 30) having at least one contact surface (19, 29, 39) connected to two electrically conductive legs (10a, 10b, 20a, 20b, 30a, 30b) and supported by said legs, wherein said legs are connected to at least one pin on different concentric circles; wherein at least one leg (20b, 30b) has a torsion portion (25, 35) between the pin and the contact surface (29, 39); And wherein the two legs (10a, 20a, 30a, 10b, 20b, 30b) are each bent 90 degrees relative to the contact surface (19, 29, 39) so that the two legs are opposite to each other and the contact surface (19, 29, 39) is located between the two legs.

2. The stator (1) according to claim 1, wherein: The torsion portion (25, 35) is arranged axially and radially relative to the stator (1).

3. The stator (1) according to claim 1 or 2, wherein: At least one leg (10a, 10b, 20a, 20b, 30a, 30b) is connected to at least two pins at an end remote from the interface.

4. The stator (1) according to claim 3, wherein: The legs are bent at an angle (26, 36) of 80 to 100 degrees between the twist portion (25, 35) and the end remote from the interface.

5. The stator (1) according to claim 1 or 2, wherein: The interface has a groove for a contact pin or a contact screw at the contact surface (19, 29, 39).

6. The stator (1) according to claim 1 or 2, wherein: The two legs (10a, 20a, 30a, 10b, 20b, 30b) are not in direct contact, and the planes on which the two legs (10a, 20a, 30a, 10b, 20b, 30b) lie are not coplanar.

7. The stator (1) according to claim 1 or 2, wherein: The legs do not protrude into the interior (I) or exterior (A) of the stator (1).

8. The stator (1) according to claim 1 or 2, wherein: Conductors (41, 43) connect selected pins (41a, 41b, 41c, 43a, 43b, 43c) below the interface.

9. The stator (1) according to claim 4, wherein: The legs are bent at a right angle between the twist portion (25, 35) and the end remote from the interface.

10. A vehicle (103) having an electric machine (100) with a stator (1) according to any one of the preceding claims.

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