Optimized connection device as contact bridge between electric machine and power electronics

Abstract

The invention relates to a connection device for electrically connecting power electronics to a stator and a separately excited rotor of an electric machine, comprising a first connection region, a second connection region, at least two stator conductors and at least two rotor conductors, the stator conductor and the rotor conductor extend between the first connection region and the second connection region, a first connection contact is arranged in the first connection region, a second connection contact is arranged in the second connection region, and the stator conductor and the rotor conductor are electrically connected with the power electronics. A second coupling contact is provided in the second coupling region, and wherein the first coupling region is rigidly designed and is connected to the second coupling region. The invention also relates to an electric machine arrangement and a vehicle.

Description

Technical Field

[0001] The invention relates to a connection device having a first connection area and a second connection area, wherein the first connection area is provided for electrically connecting to a power electronics device, wherein the second connection area is provided for electrically connecting to a separately excited rotor and a stator of an electric machine. In addition, the invention relates to an electric machine device and a vehicle having an electric machine device. Background Art

[0002] For the electric drive of electric vehicles, electric machines in the form of separately excited synchronous machines (FSM) are usually used. These electric machines must be controlled by pulse-controlled inverters (PWR) according to control commands or driver wishes. Therefore, such actuation of the electric machine requires two electrical conductors for connecting the rotor and, in the case of a three-phase electric machine, three electrical conductors for connecting the stator.

[0003] In order to be able to comply with the circulating currents in the stator and with the limit values ​​for the required electromagnetic compatibility, a ferrite core is also provided which surrounds the three electrical lines for connecting the stator to the pulse-controlled inverter.

[0004] These electrical conductors and the ferrite core are usually designed as separate components.

[0005] In a separately excited synchronous machine, the rotor winding must be supplied with current in two phases (+ and -) by the PWR. This connection (contact) is implemented with the own connection between the PWR and the slip ring module (contact with the rotor).

[0006] The three components in the FSM, namely the contact bridge, the ferrite core and the rotor current contacts, are individual components that must be installed separately.

[0007] DE 10 2018 103 788 A1 discloses a stator which can electrically contact a plurality of stator windings simultaneously via connecting elements.

[0008] US2022 / 0077734 A1 describes an electric motor, in which the electrical connection is made via a plug connector. US2004 / 0155540 A1 also describes an electric motor that can be electrically connected via a plug connector. Summary of the invention

[0009] The object of the present invention is to provide a connecting device for an electric machine, by means of which the assembly can be simplified.

[0010] This object is achieved according to the invention by a connecting device having the features of claim 1 and an electric machine having the features of claim 9. Advantageous embodiments and developments are described in the dependent claims.

[0011] The connecting device according to the invention is provided for forming an electrically conductive connection between an electric machine and a power electronics device for operating the electric machine. In addition to the electrical connection, a mechanical connection between the power electronics device and the electric machine can also be established. In this case, the connecting device can be designed as a contact bridge between the electric machine and the power electronics device.

[0012] The connection device has a first connection area and a second connection area. The first connection area is provided for electrically connecting to a power electronic device. The second connection area is provided for electrically connecting or electrically connecting to an electric machine, in particular a stator and a separately excited rotor of the electric machine.

[0013] Furthermore, the connection device has at least two stator conductors and at least two rotor conductors. The stator conductors and the rotor conductors extend between a first connection part region and a second connection part region, with a first connection contact in the first connection part region and a second connection contact in the second connection part region. The first connection part region is rigidly constructed and connected to the second connection part region. According to this design, the first connection part region and the second connection part region can form a rigid unit.

[0014] According to another aspect of the invention, an electric machine arrangement is provided. The electric machine arrangement has at least one electric machine and at least one power electronic device. In addition, at least one connection device according to the invention is provided. The power electronic device is connected to a first connection portion area of ​​the connection device. The electric machine is electrically connected to a second connection portion area. As a result, the connection device can form an electrical bridge and a mechanical bridge between the electric machine and the power electronic device.

[0015] The power electronics can be designed in the form of an inverter, in particular in the form of a pulse-controlled inverter. The electric machine can be, for example, a separately excited synchronous machine in which the rotor and the stator are supplied with electrical energy separately.

[0016] According to one aspect of the present invention, a vehicle is provided, which has at least one motor device according to the present invention. Here, the motor can be configured as a power motor. Here, a power battery can be provided to supply electrical energy to the motor. The power electronics device is used as a control device for the motor, for example, to clock the stator of the motor at a predetermined frequency.

[0017] By designing the connecting device, the stator conductors, rotor conductors and ferrite cores, which are usually designed as separate components, can be assembled into one component. This measure can reduce the installation space required for realizing the HV (high voltage) connection between the power electronics and the stator winding. In addition, the logistics and assembly costs for the connecting device can be reduced.

[0018] In one embodiment, the first terminal region is oriented in a manner rotated by 90° relative to the second terminal region. As a result, the assembly direction for the electrical contacting of the connecting contacts can also be rotated by 90° to simplify the connection of the connecting device to power electronics and electric machines.

[0019] According to another embodiment, the first connecting contact can be electrically contacted in the height direction and the second connecting contact can be electrically contacted in the length direction. This measure allows the connecting contacts in the second connection part area to be fixed laterally and the connecting contacts in the first connection part area to be fixed from above. Thus, the power electronics device can be placed on the connecting device, for example, in the form of a module. The connecting device can extend laterally to the motor and be electrically connected to the motor.

[0020] The height direction can be, for example, the height direction of a vehicle in which the connecting device can be applied. Here, the length direction can be consistent with the driving direction of the vehicle or at least parallel to the driving direction.

[0021] According to another embodiment, the connection device has at least one ferrite core. As a result, the ferrite core can be integrated into the connection device for implementing measures regarding electromagnetic compatibility. The ferrite core can be designed in one piece or in multiple pieces.

[0022] According to another embodiment, the ferrite core is annular in shape, wherein at least the stator conductors are guided through the ferrite core. As a result, electromagnetic interference effects caused by high-frequency energy transmission through the stator winding can be optimally attenuated.

[0023] According to another embodiment, the first and / or second connecting contacts are designed in the form of cable end sections and / or contact plates and / or screw connections and / or plug connections. This measure enables particularly flexible electrical contacting of the connecting contacts in the area of ​​the motor and the power electronics.

[0024] According to another embodiment, the connecting device has a housing, which is provided for receiving and fixing the stator wire and / or the rotor wire and / or the ferrite core. In this case, the housing can be at least partially hollow in order to receive the stator wire and / or the rotor wire and / or the ferrite core. In an alternative or additional design, the housing can be at least partially formed by potting the stator wire and / or the rotor wire and / or the ferrite core.

[0025] According to another embodiment, the housing is designed in an "L" or "I" shape, wherein the first connection area and the second connection area are spaced apart from one another by a ferrite core. By this measure, the housing can predetermine the arrangement of the connection areas and form them mechanically rigidly. As a result, the connection device can be designed to be particularly stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention is further described by schematically illustrating the embodiments in the accompanying drawings and with reference to the accompanying drawings. The drawings show:

[0027] Figure 1 A connecting device according to an embodiment of the present invention is shown.

[0028] Figure 2 An electric machine device according to one embodiment of the present invention is shown.

[0029] List of reference numerals:

[0030] 1 Motor device

[0031] 10 Connection device

[0032] 11 First connection area

[0033] 12 Second connection area

[0034] 13 Housing

[0035] 14 Stator wire

[0036] 15 Rotor wire

[0037] 16 Ferrite core

[0038] 17 Fixing holes

[0039] 20 Motor

[0040] 21 Stator

[0041] 24 Second connection contact of stator conductor

[0042] 25 Second connecting contact of rotor conductor

[0043] 30 Power Electronics Devices

[0044] 34 First connection contact of stator conductor

[0045] 35 The first connecting contact of the rotor conductor

[0046] H Height direction

[0047] L Length direction DETAILED DESCRIPTION

[0048] Figure 1 1 shows a connection device 10 according to an exemplary embodiment of the present invention. The connection device 10 is provided for forming an electrically conductive connection between an electric machine 20 and a power electronics device 30 for controlling the electric machine 20 (see Figure 2 ).

[0049] In addition to the electrical connection, the connection device 10 also establishes a mechanical connection between the power electronics 30 and the electric machine 20 . The connection device 10 acts as a contact bridge between the electric machine 20 and the power electronics 30 .

[0050] The connecting device 10 has a first connection area 11 and a second connection area 12. The first connection area 11 is provided for electrically connecting to the power electronics 30. The second connection area 12 is provided for electrically connecting to the electric machine 20. For this purpose, a housing 13 is provided, which serves as a mechanically rigid support and the connection areas 11, 12 are formed in the form of two platforms spaced apart from each other. The housing 13 is designed in an "L" shape in the illustrated embodiment.

[0051] Furthermore, the connecting device 10 has, by way of example, three stator conductors 14 and two rotor conductors 15. The stator conductors 14 and the rotor conductors 15 extend between a first connection region 11 having first connecting contacts 34, 35 and a second connection region 12 having second connecting contacts 24, 25.

[0052] The first connection region 11 is spaced apart from the second connection region 12 by a ferrite core 16. The stator conductor 14 is passed through the annular ferrite core 16. The ferrite core 16 also forms a rotation point at which the connection regions 11, 12 are oriented differently from one another. Here, the first connection region 11 is oriented in the height direction H. The second connection region 12 is oriented in the length direction L in a manner rotated by 90°.

[0053] The connection device 10 further comprises a plurality of fixing holes 17 , which are provided for screwing the connection device 10 to other components or structural components.

[0054] exist Figure 2 1 shows an electric machine device 1 according to an embodiment of the present invention. The electric machine device 1 has, for example, an electric machine 20 and a power electronics device 30. The power electronics device 30 is designed, for example, in the form of a pulse-controlled inverter. In the embodiment shown, the electric machine 20 is designed as a separately excited synchronous machine.

[0055] In addition, Figure 22 schematically shows a portion of a stator 21 of an electric machine 20 in the form of a sectional view. The stator 21 is supplied with electrical energy via stator wires 14. The rotor (not shown) is supplied with electrical energy via rotor wires 15. The corresponding electrical energy supply is provided by power electronics 30, which are mounted in the form of a module on the connecting device 10, in particular on the first connection area 11. Due to the "L" shape of the housing 13, the second connection area 12 can extend laterally beside the electric machine 20 and make electrical contact there. Therefore, the connecting device 10 can form an electrical bridge and a mechanical bridge between the electric machine 20 and the power electronics 30.

Claims

1. A connection device (10) for electrically connecting a power electronic device (30) to a stator (21) and a separately excited rotor of an electric machine (20), the connection device comprising a first connection region (11), a second connection region (12), at least two stator conductors (14) and at least two rotor conductors (15), wherein: The first connection region (11) is provided for electrically connecting to a power electronic device (30), wherein the second connection region (12) is provided for electrically connecting to a stator (21) and a separately excited rotor of an electric machine (20), wherein stator conductors (14) and rotor conductors (15) extend between the first connection region (11) and the second connection region (12), wherein the first connection region (11) has first connection contacts (34, 35) and the second connection region (12) has second connection contacts (24, 25), wherein the first connection region (11) is rigidly constructed and connected to the second connection region (12).

2. The connection device according to claim 1, characterized in that: The first coupling region (11) is oriented in a manner rotated by 90° relative to the second coupling region (12).

3. The connection device according to claim 1 or 2, characterized in that: The first connecting contacts (34, 35) can make electrical contact along the height direction (H), while the second connecting contacts (24, 25) can make electrical contact along the length direction (L).

4. The connection device according to any one of claims 1 to 3, characterized in that: The connecting device (10) has at least one ferrite core (16).

5. The connection device according to claim 4, characterized in that: The ferrite core (16) is designed in an annular shape, wherein at least the stator conductor (14) passes through the ferrite core (16).

6. The connection device according to any one of claims 1 to 5, characterized in that: The first connecting contact (34, 35) and / or the second connecting contact (24, 25) are designed in the form of a cable end section and / or a contact plate and / or a screw connection and / or a plug connection.

7. The connection device according to any one of claims 1 to 6, characterized in that: The connecting device (10) has a housing (13) which is provided for receiving and fixing a stator conductor (14) and / or a rotor conductor (15) and / or a ferrite core (16).

8. The connection device according to claim 7, characterized in that: The housing (13) is constructed in an "L" shape or an "I" shape, wherein a first connection portion region (11) and a second connection portion region (12) are spaced apart from each other by a ferrite core (16).

9. An electric machine arrangement (1) having at least one electric machine (20) and at least one power electronics device (30) and at least one connecting device (10) according to any one of the preceding claims, wherein: The power electronic device (30) is electrically connected to a first connection region (11) of the connection device (10), and the electric machine (20) is electrically connected to a second connection region (12) of the connection device (10).

10. A vehicle having at least one electric machine arrangement (1) according to claim 9.

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