Synchronous Machine

Abstract

The invention relates to a synchronous machine (1) comprising a stator group (2) with a housing (3) and a stator (4), and a rotor group (5) with a shaft (6) and a rotor (7). The rotor group (5) is mounted on the stator (4) so ​​as to be rotatable about an axis of rotation (RA). The synchronous machine (1) also comprises an end shield (8) for the housing (3) and a bearing (10) for the shaft (6). The synchronous machine (1) further comprises an energy transmitter (12) with a magnetic core (13). According to the invention, the magnetic core (13) is arranged radially between the end shield (8) and the bearing (10) and is part of the end shield (8).

Description

[Technical field]

[0001] The invention relates to an induction-fed synchronous machine according to the preamble of claim 1 . [Background technology]

[0002] An inductively excited synchronous machine typically has a stator and a rotor rotatably arranged within the stator. Energy is transferred to the rotating rotor windings by an energy transmitter. The energy transmitter has a stator-side primary coil and a rotor-side secondary coil, which electromagnetically interact with each other. Also, a stator-side inverter and a rotor-side rectifier are provided. The energy transmitter is located outside the housing of the synchronous machine, which disadvantageously requires additional installation space. Summary of the Invention [Problem to be solved by the invention]

[0003] SUMMARY OF THE DISCLOSURE It is therefore an object of the present invention to provide an improved or at least alternative embodiment of a synchronous machine of the general type which overcomes the abovementioned drawbacks. [Means for solving the problem]

[0004] According to the invention, this object is achieved by the subject matter of independent claim 1. Advantageous embodiments are the subject matter of the dependent claims.

[0005] The inductively excited synchronous machine comprises a stator group with a housing and a stator arranged in the housing. The synchronous machine also comprises a rotor group with a shaft and a rotor non-rotatably connected to the shaft. The rotor group is arranged rotatably about an axis of rotation in the stator of the stator group. The synchronous machine further comprises a bearing shield and a bearing fixed to the bearing shield, the bearing shield axially closing the housing of the stator group and the bearing rotatably supporting the shaft of the rotor group. The synchronous machine further comprises an energy transmitter with a hollow cylindrical magnetic core. According to the invention, the magnetic core is arranged radially between the bearing shield and the bearing and forms part of the bearing shield.

[0006] With respect to the present invention, the terms "axial" and "radial" always relate to the axis of rotation.

[0007] The magnetic core is arranged between the bearing shield and the bearing and can be fixed in a substantially connected and / or non-positively connected and / or positively connected manner to the bearing shield and / or the bearing. The magnetic core can support the mechanical loads occurring in the synchronous machine. By arranging the magnetic core between the bearing shield and the bearing, the installation space required for the energy transmitter can be reduced and the synchronous machine can be made smaller in the axial direction. Furthermore, the cost of the synchronous machine can be reduced.

[0008] The energy transmitter of the synchronous machine may have further components in addition to the magnetic core. Thus, the energy transmitter may have a primary coil, a secondary coil, a rectifier and an inverter. The individual components of the energy transmitter are divided into a primary or stator side, i.e. fixed elements, and a secondary or rotor side, i.e. rotating elements. The magnetic core, the primary coil and the inverter are the primary or stator side, i.e. fixed elements. The secondary coil and the rectifier are the secondary or rotor side, i.e. rotating elements. The primary coil and the secondary coil may interact electromagnetically with each other. The magnetic core may include or surround at least a portion of the primary coil, which may amplify the electromagnetic interaction between the primary coil and the secondary coil. The magnetic core is advantageously made of a ferrite-based material.

[0009] In a further development of the synchronous machine, the energy transmitter can have a reinforcing element. The reinforcing element can be located outside the magnetic core and can at least partially contain or surround the magnetic core. The reinforcing element can be rigidly connected to the magnetic core in a substantially connected manner and / or in a positively connected manner and / or in a non-positively connected manner. The reinforcing element can protect the magnetic core from mechanical loads and thus can extend the service life of the magnetic core. The reinforcing element can be made of steel, for example.

[0010] Advantageously, the reinforcing element can have at least one hollow cylindrical part. The at least one hollow cylindrical part of the reinforcing element can be arranged to be located against the magnetic core and facing the bearing or the bearing shield. Furthermore, the reinforcing element can be configured in a C-shape and arranged on the magnetic core. The reinforcing element can then envelop the magnetic core with two side surfaces surrounding the axis of rotation and coaxial with each other, and with the axial side of the magnetic core arranged crosswise with respect to the axis of rotation. In this way, the magnetic core can be particularly effectively reinforced and protected against mechanical loads.

[0011] The bearing may have an inner ring arranged non-rotatably on the shaft, an outer ring and at least two rolling elements arranged between the outer ring and the inner ring. The outer ring of the bearing may be in direct contact with the magnetic core or said reinforcing element. The bearing may rigidly connect the magnetic core or the reinforcing element to the outer ring in a substantially connected manner and / or in a positively connected manner and / or in a non-positively connected manner.

[0012] In a further development of the synchronous machine, the energy transmitter can have a secondary coil surrounding the axis of rotation and a disk supporting the secondary coil. The disk can be arranged transversely to the axis of rotation and can be non-rotatably connected to the shaft of the rotor group. The secondary coil can be arranged so as to be capable of inductively interacting with a primary coil that is at least partially surrounded by the magnetic core. The secondary coil can in particular be a coil arranged flat on the disk. The secondary coil can in particular be arranged axially adjacent to the primary coil that is arranged on the magnetic core.

[0013] Furthermore, the core can protrude from the bearing on one side of the bearing, and the disk can protrude radially into the core in the region where the core protrudes axially from the bearing, so that a secondary coil arranged on the disk can be arranged, in particular axially adjacent to a primary coil at least partially surrounded by the core.

[0014] Further important features and advantages of the invention emerge from the dependent claims, the drawing and the description relating to the drawings.

[0015] It is to be understood that the features mentioned above and described below can not only be used in the respective combinations described, but can also be used in other combinations or by themselves without departing from the scope of the invention.

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred exemplary embodiments of the present invention are illustrated in the drawings and described in more detail below, where like reference numbers refer to identical or similar or functionally identical elements.

[0017] Each figure is a schematic diagram. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a cross-sectional view of a synchronous machine according to the present invention. [Diagram 2] FIG. 2 is a plan view of the synchronous machine according to the present invention. [Diagram 3] FIG. 3 shows a cross-section of a region of a bearing shield of a synchronous machine according to the invention. [Figure 4] FIG. 4 shows a cross-section of a region of a bearing shield of a synchronous machine according to the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] 1 is a cross-sectional view of an inductively excited synchronous machine 1 according to the present invention. The synchronous machine 1 has a stator group 2 with a housing 3 and a stator 4, which is supported non-rotatably within the housing 3. The synchronous machine 1 further has a rotor group 5 with a shaft 6 and a rotor 7, which is non-rotatably connected to the shaft 6. The rotor group 4 is arranged to be rotatable about a rotation axis RA within the stator group 2. The rotor 7 is arranged radially adjacent to the stator 4 and spaced apart from the stator 4, so that the rotor 7 and the stator 4 can electromagnetically interact with each other.

[0020] The synchronous machine 1 further includes a bearing shield 8 and a second bearing shield 9 that cross the rotation axis RA at an axial end of the synchronous machine 1 and close the housing 3 of the stator group 2. The synchronous machine 1 also includes a bearing 10 and a second bearing 11 that rotatably support the shaft 6 of the rotor group 5 at an axial end of the synchronous machine 1. The second bearing 11 is fixed to the second bearing shield 9. Fixing the bearing 10 to the bearing shield 8 will be described in detail below.

[0021] Furthermore, the synchronous machine 1 has an energy transmitter 12. The energy transmitter 12 has a primary coil (not shown here) and a magnetic core 13 on the primary side. It should be understood that the energy transmitter 12 may have other primary side components as well. The magnetic core 13 is hollow cylindrical and encases or surrounds at least a portion of the primary coil. The magnetic core 13 may be made of a ferritic material. The magnetic core 13 is radially disposed between the bearing 10 and the bearing shield 8 and is rigidly connected thereto. The magnetic core 13 therefore forms part of the bearing shield 8 (is part of the bearing shield 8) or is integrated into the bearing shield 8.

[0022] Advantageously, the energy transmitter 12 is arranged in a space-saving manner within the synchronous machine 1. The synchronous machine 1 can thus be designed more compactly in the axial direction, and the costs of the synchronous machine 1 can be reduced.

[0023] 2 is a plan view of the synchronous machine 1 according to the invention. In this figure, it can be particularly seen that the magnetic core 13 is arranged between the bearing 10 and the bearing shield 8 and is in direct contact with them. The magnetic core 13 can be connected to the bearing 10 and the bearing shield 8 in a substantially connected manner and / or in a positively connected manner and / or in a non-positively connected manner.

[0024] Fig. 3 is a cross-sectional view of the region of the bearing shield 8 of a synchronous machine 1 according to the invention. According to Fig. 3, the energy transmitter 12 comprises a secondary disk 14 and a secondary coil (not shown) arranged on the disk 14. However, it should be understood that the energy transmitter 12 may also comprise other secondary components. The magnetic core 13 projects axially outward from the bearing 10, and the disk 14 projects radially into the magnetic core 13. The secondary coil can therefore be arranged on the disk 14 in the magnetic core 13, axially adjacent to the primary coil. The primary coil and the secondary coil together form a transformer.

[0025] Figure 4 shows a cross-sectional view of the region of the bearing shield 8 of a synchronous machine 1 according to the invention. In this figure, in contrast to figure 3, the energy transmitter 12 has a reinforcing element 15, which can advantageously be made of steel. The reinforcing element 15 is C-shaped and surrounds the magnetic core 13 with two mutually concentric side faces and with an axial face arranged crosswise relative to the axis of rotation RA. In this way, the reinforcing element 15 reinforces the magnetic core 13 of softer ferrite material so that the magnetic core 13 can better withstand mechanical loads.

Claims

1. An induction-excited synchronous machine (1), The synchronous machine (1) has a housing (3) and a stator group (2) including a stator (4) arranged in the housing (3), The synchronous machine has a rotor group (5) including a shaft (6) and a rotor (7) non-rotatably connected to the shaft (6), The rotor group (5) is rotatably disposed within the stator (4) of the stator group (2) about a rotation axis (RA), The synchronous machine (1) has a bearing shield (8) and a bearing (10) fixed to the bearing shield (8), The bearing shield (8) axially closes the housing (3) of the stator group (2), and the bearings (10) rotatably support the shaft (6) of the rotor group (5), The synchronous machine (1) comprises an energy transmitter (12) having a hollow cylindrical magnetic core (13), Features: The magnetic core (13) is disposed radially between the bearing shield (8) and the bearing (10) and forms part of the bearing shield (8). This is called a synchronous machine.

2. 2. The synchronous machine according to claim 1, A synchronous machine, characterized in that the magnetic core (13) is made of a ferrite material.

3. 2. The synchronous machine according to claim 1, The energy transmitter (12) comprises a reinforcing element (15), the reinforcing element (15) being located outside the magnetic core (13) and at least partially surrounding and reinforcing the magnetic core (13).

4. 4. The synchronous machine according to claim 3, A synchronous machine, characterized in that the reinforcing element (15) is made of steel.

5. 4. The synchronous machine according to claim 3, said reinforcing element (15) having at least one hollow cylindrical portion; and A synchronous machine, characterized in that at least one hollow cylindrical part is arranged opposite said magnetic core (13) and faces said bearing (10) or bearing shield (8).

6. 4. The synchronous machine according to claim 3, The reinforcing element (15) is configured in a C-shape and is placed on the magnetic core (13). A synchronous machine, characterized in that the reinforcing element (15) surrounds the magnetic core (13) with two side surfaces that surround the rotation axis (RA) and are concentric with each other, and with an axial surface that is arranged so as to intersect with the rotation axis (RA).

7. 2. The synchronous machine according to claim 1, The bearing (10) has an inner ring non-rotatably arranged on the shaft (6), an outer ring, and at least two rolling elements arranged between the outer ring and the inner ring.

8. 8. The synchronous machine according to claim 7, A synchronous machine, characterized in that the outer ring of the bearing (10) is in direct contact with the magnetic core (13) or in contact with a reinforcing element (15) that is arranged outside the magnetic core (13) and at least partially surrounds and reinforces the magnetic core (13).

9. 2. The synchronous machine according to claim 1, The energy transmitter (12) has a secondary coil surrounding the rotation axis (RA) and a disk (14) supporting the secondary coil, The disk (14) is disposed transversely to the rotation axis (RA) and is non-rotatably connected to the shaft (6) of the rotor group (5). A synchronous machine, characterized in that the secondary coil is arranged so as to be capable of inductively interacting with a primary coil that is at least partially surrounded by the magnetic core (13).

10. 10. The synchronous machine according to claim 7 or 9, said magnetic core (13) protruding axially from the bearing (10) on one side thereof; and A synchronous machine, characterized in that a disk (14) projects radially into said core (13) in the region where said core (13) projects axially beyond said bearing (10).

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