Rotor of electrically excited synchronous machine

Abstract

The invention relates to a rotor of an electrically excited synchronous electric machine (1), comprising a rotor shaft (8) that can be rotated about a rotor axis (7), a rotor body (9) coupled to the rotor shaft (8), in particular a rotor plate pack, and a secondary unit (10) of an energy transmission system, in particular of a rotary transmitter, connected to the rotor shaft (8) in a rotationally fixed manner, the invention relates to a secondary unit (10) for contactless transmission of electrical energy into an excitation winding (3) of a rotor (2) of an electric machine (1), the secondary unit (10) comprising a secondary winding carrier (11), a secondary winding (12) arranged on the secondary winding carrier (11), and a printed circuit board (13) extending in a radial direction with respect to a rotor axis (7), the circuit board has a rectifier circuit (14) for generating a DC voltage for the field winding (3). -a printed circuit board (13) of the secondary unit (10), in particular an electronic or electrical component (15) of the printed circuit board (13), can be cooled with a cooling fluid from the rotor shaft (8) and-a cooling fluid for cooling the printed circuit board (13) can be conducted in a radial direction onto a front face (13f) and / or a rear face (13b) of the printed circuit board (13).

Description

Technical Field

[0001] This invention relates to the rotor of an electrically excited synchronous motor of the type according to the independent claims. Background Technology

[0002] The rotor of an electrically excited synchronous motor is known from DE2653401 A1. This rotor has a rotor shaft rotatable about a rotor axis, a rotor body coupled to the rotor shaft, particularly an assembly of rotor plates, and a secondary unit, torsionally connected to the rotor shaft, having an energy transfer system, particularly a rotary transmitter. This secondary unit is used to transfer electrical energy contactlessly to the excitation windings of the motor's rotor. The secondary unit includes a secondary winding support, secondary windings arranged on the secondary winding support, and a circuit board extending radially about the rotor axis. This circuit board has a rectifier circuit for generating a DC voltage for the excitation windings. The rectifier circuit includes diodes and a rectifier mounting plate. A cooling jet of cooling fluid is sprayed onto the diodes and the rectifier mounting plate through fixed cooling openings in the housing. Cooling is not optimal because the diodes are not continuously cooled by the cooling jet, but only at the moment when the diodes pass by and are struck by the cooling jet.

[0003] Advantages of the present invention In contrast, the rotor of the electrically excited synchronous motor according to the invention, possessing the characteristic features of the independent claims, has the advantage of improved cooling of the rectifier circuitry. This is achieved by cooling the circuit boards of the secondary units, particularly the electrical or electronic structural elements of the circuit boards, especially semiconductor elements, printed wires, or solder joints for connecting structural elements, with cooling fluid from the rotor shaft. Furthermore, the cooling fluid used to cool the circuit boards can be guided radially to the front and / or back surfaces of the circuit boards. In this way, cooling fluid from the rotor shaft can be continuously guided to the cooling-related structural elements of the rectifier circuitry, particularly to the so-called hot spots of the rectifier circuitry.

[0004] Advantageous extensions and improvements to the rotor of the electrically excited synchronous motor described in the independent claim can be achieved through the measures listed in the dependent claims.

[0005] According to an advantageous embodiment, cooling fluid can be guided onto the circuit board via at least one delivery opening in at least one delivery path, originating from the shaft cooling channel of the rotor shaft. Sufficient cooling fluid is provided for cooling the circuit board through at least one delivery path.

[0006] Particularly advantageous is that the secondary winding support has a support passage for guiding the rotor shaft, wherein an annular slit-shaped distributor channel is formed between the distributor section of the support passage and the rotor shaft. This distributor channel, as part of the delivery path, is configured to distribute cooling fluid to a plurality of delivery openings arranged sequentially along the circumferential direction and is fluidly connected to the shaft cooling channel through at least one shaft opening. Thus, cooling fluid can be guided onto the circuit board through the multiple delivery openings, thereby enabling optimal cooling of multiple cooling-related structural components of the rectifier circuit. Furthermore, the aforementioned components of the delivery path can thus be formed in a simple and cost-effective manner.

[0007] Furthermore, it is advantageous that the corresponding delivery openings of the delivery path are radially positioned inside the structural elements of the circuit board, particularly within the circuit board itself. In this way, the cooling fluid can be guided radially along the circuit board and its cooling-related structural elements, originating from the delivery openings.

[0008] Advantageously, according to the first design, the cooling fluid can be guided in the radial direction along the front and / or back of the circuit board, either as a cooling film starting from the corresponding delivery opening or, in the case of channel guidance, along the front and / or back of the circuit board.

[0009] Advantageously, according to the first design, limiting walls extending radially and circumferentially are provided on the front and / or back of the circuit board to form cooling channels for cooling the circuit board, wherein the cooling channels are formed between the circuit board and the limiting walls. This forms a closed cooling channel for cooling the circuit board. The circuit board can have metallized through-holes for better cooling of the structural components of the circuit board.

[0010] Furthermore, advantageously, according to the second design, the cooling fluid can be guided radially as a spray or jet from the corresponding delivery opening onto the structural elements of the circuit board. In this way, the structural elements of the circuit board, especially the housing of the structural elements or the connecting surfaces of the structural elements relative to the circuit board, can be cooled directly.

[0011] Furthermore, it is advantageous that the circuit board is arranged in the circuit board receiving portion of the secondary winding support and / or particularly configured in a ring-shaped manner. The circuit board receiving portion of the secondary winding support can thus not only hold or fix the circuit board but also guide cooling fluid in sections.

[0012] Advantageously, the secondary unit has at least one outlet for discharging cooling fluid, which is particularly located on the inner periphery of the cylindrical section of the circuit board receiving portion, especially on the corner of the inner periphery, and / or on the front side of the circuit board. In this way, after cooling the circuit board, the cooling fluid can be directed towards the winding heads of the motor stator. Therefore, the cooling fluid used to cool the secondary unit can also be used to cool the motor stator.

[0013] Furthermore, it is advantageous that the secondary unit has a fluid connection upstream of the outlet and downstream of the delivery opening, which guides the cooling fluid from the back of the circuit board to the front of the circuit board. In this way, the cooling fluid guided to the back of the circuit board can be guided from the back of the circuit board to the front of the circuit board and from there, together with the cooling fluid on the front, is thrown off through the outlet located on the front.

[0014] Furthermore, the present invention relates to an electric motor having a rotor according to the invention and further comprising a static primary unit of an energy transmission system. Attached Figure Description

[0015] An embodiment of the present invention is shown simplified in the accompanying drawings and explained in detail in the following description.

[0016] in: Figure 1 An electric motor with an energy transmission system is shown, the energy transmission system comprising a primary unit and a secondary unit according to the present invention; Figure 2 It shows according to Figure 1 The view of the secondary cell, and Figure 3 It shows according to Figure 1 and Figure 2 Side view of the secondary unit. Detailed Implementation

[0017] Figure 1 An electric motor with an energy transmission system is shown, the energy transmission system comprising a primary unit and a secondary unit according to the invention.

[0018] Motor 1 is an electrically excited synchronous motor 1, which has a rotor 2 with excitation winding 3 and a stator 4 with stator winding 5.

[0019] The rotor 3 of the motor 1 includes a rotor shaft 8 rotatable around a rotor axis 7, a rotor body 9 coupled to the rotor shaft 8, and, in particular, a rotor plate assembly. Furthermore, a secondary unit 10 of the energy transfer system 6, which is torsionally connected to the rotor shaft 8, is provided on the rotor 3 for contactless transmission of electrical energy to the excitation winding 3 of the rotor 2 of the motor 1. The secondary unit 10 of the energy transfer system 6 works in conjunction with the static primary unit 30 of the energy transfer system 6. The energy transfer system 6 is also referred to as a rotary transmitter.

[0020] The secondary unit 10 includes a secondary winding support 11, a secondary winding 12 disposed on the secondary winding support 11, and a circuit board 13 extending radially about the rotor axis 7, the circuit board having a rectifier circuit 14 for generating a DC voltage for the excitation winding 3.

[0021] According to the present invention, the circuit board 13 of the secondary unit 10, in particular the electronic or electrical structural elements 15 of the circuit board 13, can be cooled by cooling fluid from the rotor shaft 8, and the cooling fluid for cooling the circuit board 13 can be guided radially to the front side 13f and / or the back side 13b of the circuit board 13.

[0022] The structural elements 15 of the circuit board 13 can be, for example, semiconductor elements, printed wires, solder joints for connecting structural elements, or so-called pinfins.

[0023] Cooling fluid can be guided to the circuit board 13 from the axial cooling channel 16 of the rotor shaft 8 through at least one conveying opening 18 of at least one conveying path 19.

[0024] Figure 2 It shows according to Figure 1 The view of the secondary cell.

[0025] The secondary winding support 11 has a support passage 20 for guiding the rotor shaft 8. An annular slit-shaped distributor channel 22 is formed between the distributor section 21 of the support passage 20 and the rotor shaft 8. This distributor channel, as part of the delivery path 19, is configured to transfer cooling fluid to at least one delivery opening 18 and is directly or indirectly fluidly connected to the shaft cooling channel 16 through at least one shaft opening 23. According to this embodiment, the distributor channel 22 is configured to distribute cooling fluid to a plurality of delivery openings 18 arranged sequentially along the circumferential direction. Figure 3 ).

[0026] The corresponding conveying openings 18 of the conveying path 19 are arranged radially inside the structural elements 15 of the circuit board 13, and especially radially inside the circuit board 13.

[0027] According to the first embodiment, the cooling fluid can be guided radially along the front side 13f and / or the back side 13b of the circuit board 13, either as a cooling film or under the guidance of a corresponding delivery opening 18. A limiting wall 25 extending radially and circumferentially can be provided on the front side 13f and / or the back side 13b of the circuit board 13 to form a cooling channel 26 for cooling the circuit board 13. The cooling channel 26 is then formed between the circuit board 13 and the limiting wall 25.

[0028] As an alternative, according to the second embodiment, the cooling fluid can be guided radially to the structural element 15 of the circuit board 13 as a spray or jet, starting from the corresponding delivery opening 18.

[0029] The circuit board 13 can be arranged, for example, in the circuit board receiving portion 27 of the secondary winding support 11.

[0030] The secondary unit 10 has at least one outlet 29 for discharging cooling fluid, which is particularly located on the inner periphery of the cylindrical section 27.1 of the circuit board receiving portion 27, and especially on the corner 28 of the inner periphery. The outlet 29 is, for example, constructed on the front side 13f of the circuit board 13.

[0031] The secondary unit 10 is capable of having a fluid connection 31 upstream of the outlet 29 and downstream of at least one delivery opening 18, the fluid connection being configured to guide cooling fluid from the back side 13b of the circuit board 13 to the front side 13f of the circuit board 13.

[0032] Figure 3 It shows according to Figure 1 and Figure 2 Side view of the secondary unit.

[0033] The circuit board 13 is configured in a ring-shaped manner and extends between the inner and outer peripheries of the circuit board in a circumferential direction surrounding the rotor axis 7 and in a radial direction.

Claims

1. A rotor of an electrically excited synchronous motor (1), the rotor having a rotor shaft (8) rotatable about a rotor axis (7), a rotor body (9) coupled to the rotor shaft (8), and a secondary unit (10) torsionally connected to the rotor shaft (8) and having an energy transmission system, particularly a rotary transmitter, the secondary unit for transmitting electrical energy contactlessly to the excitation winding (3) of the rotor (2) of the motor (1), wherein the secondary unit (10) comprises a secondary winding support (11), a secondary winding (12) arranged on the secondary winding support (11), and a circuit board (13) extending radially about the rotor axis (7), the circuit board having a rectifier circuit (14) for generating a DC voltage for the excitation winding (3), characterized in that, - The circuit board (13) of the secondary unit (10), and especially the electronic or electrical structural elements (15) of the circuit board (13), can be cooled by cooling fluid from the rotor shaft (8) and - Cooling fluid for cooling the circuit board (13) can be guided radially to the front (13f) and / or back (13b) of the circuit board (13).

2. The rotor according to claim 1, characterized in that, The cooling fluid can be guided to the circuit board (13) via at least one delivery opening (18) of at least one delivery path (19) starting from the shaft cooling channel (16) of the rotor shaft (8).

3. The rotor according to claim 2, characterized in that, The secondary winding support (11) has a support passage (20) for passing through the rotor shaft (8), wherein an annular slit-shaped distributor channel (22) is formed between the distributor section (21) of the support passage (20) and the rotor shaft (8), the distributor channel being configured as part of a delivery path (19) for distributing cooling fluid to a plurality of delivery openings (18) arranged sequentially along the circumferential direction and fluidly connected to the shaft cooling channel (16) through at least one shaft opening (23).

4. The rotor according to any one of claims 2 or 3, characterized in that, The corresponding conveying opening (18) of the conveying path (19) is radially disposed inside the structural element (15) of the circuit board (13), especially radially disposed inside the circuit board (13).

5. The rotor according to any one of claims 2 to 4, characterized in that, The cooling fluid can be guided in the radial direction along the front (13f) and / or back (13b) of the circuit board (13) as a cooling film, starting from the corresponding delivery opening (18) or in the case of channel guidance.

6. The rotor according to claim 5, characterized in that, A limiting wall (25) extending in the radial and circumferential directions is provided on the front side (13f) and / or on the back side (13b) of the circuit board (13) to form a cooling channel (26) for cooling the circuit board (13), wherein the cooling channel (26) is formed between the circuit board (13) and the limiting wall (25).

7. The rotor according to claims 2 to 4, characterized in that, The cooling fluid can be guided radially to the structural elements (15) of the circuit board (13) as a spray or beam, starting from the corresponding delivery opening (18).

8. The rotor according to any one of the preceding claims, characterized in that, The circuit board (13) is arranged in the circuit board receiving portion (27) of the secondary winding support (11) and / or is particularly configured in a ring-shaped manner.

9. The rotor according to any one of the preceding claims, characterized in that, The secondary unit (10) has at least one outlet (29) for discharging cooling fluid, which is provided in particular on the inner periphery of the cylindrical section (27.1) of the circuit board receiving portion (27), especially on the corner (28) of the inner periphery and / or on the front side (13f) of the circuit board (13).

10. The rotor according to claim 9, characterized in that, The secondary unit (10) has a fluid connection (31) upstream of the outlet (29) and downstream of the corresponding delivery opening (18), the fluid connection being configured to guide cooling fluid from the back (13b) of the circuit board (13) to the front (13f) of the circuit board (13).

11. An electric motor having a rotor (2) according to any one of the preceding claims and a static primary unit (30) having an energy transmission system (6).

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