Rotor of an electrically excited synchronous machine
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- ROBERT BOSCH GMBH
- Filing Date
- 2024-07-30
- Publication Date
- 2026-06-24
Smart Images
Figure EP2024071528_20022025_PF_FP_ABST
Abstract
Description
[0001] Description
[0002] title
[0003] Rotor of an electrically excited synchronous machine
[0004] State of the art
[0005] The invention is based on a rotor of an electrically excited synchronous machine according to the preamble of the main claim.
[0006] A rotor of an electrically excited synchronous machine is already known from DE102021129951 A1. This rotor comprises a rotor body rotatable about a rotor axis, in particular a rotor core, which has a plurality of salient poles arranged along a circumferential direction of the rotor, each having a pole shaft. The pole shafts of the salient poles are each enclosed by an individual coil of an excitation winding. A star disk is provided on each of the two end faces of the rotor body, each of which has an annular portion, a plurality of toothed portions projecting from the annular portion in the radial direction relative to the rotor axis, and winding receptacles formed on the toothed portions for each receiving a winding head of the respective individual coil. The annular portion and the toothed portions of the respective star disk are designed as a one-piece central component.The winding holders are connected to each other in one piece and are therefore designed as a coherent star-shaped part that is designed separately from the central component.
[0007] At high rotor speeds, the winding receptacles of the respective star disks are subjected to high centrifugal forces due to the mass of the wound individual coils. Depending on the maximum speed and the mass of the individual coil, this can lead to mechanical overload of the central component, which could cause cracks or breakage in the central component.
[0008] Advantages of the invention
[0009] The rotor of an electrically excited synchronous machine according to the invention, with the characterizing features of the main claim, has the advantage that the speed stability of the respective star disk is increased by mechanically decoupling the winding receptacles from the central component. This reduces the mechanical load on the central component of the star disk.
[0010] This is achieved according to the invention in that each winding receptacle is attached as a separate part to a tooth section of the central component, in particular by injection molding or plugging.
[0011] The measures listed in the subclaims enable advantageous further developments and improvements of the rotor of an electrically excited synchronous machine specified in the main claim.
[0012] It is particularly advantageous if each winding receptacle engages the associated toothed section of the central component on at least two sides, in particular three sides, in an undercut manner, forming a profile groove that, in particular, has an omega-shaped or T-shaped groove cross-section. In this way, the toothed section forms a radially aligned linear guide, so that the respective winding receptacle can be radially displaced along the toothed section when subjected to centrifugal force. The load of the winding receptacle and the individual coil provided thereon thus does not act on the central component, thereby relieving the central component of mechanical stress.
[0013] It is further advantageous if the tooth sections of the central component each have a tooth cross-section that corresponds to the groove cross-section of the associated profile groove. In this way, the tooth section forms a radially aligned linear guide, allowing the respective winding holder to be radially displaced on the tooth section under centrifugal force.
[0014] It is very advantageous if the toothed sections of the central component are each designed to allow radial displacement of the respective winding holder along the toothed section under centrifugal force, guided by the profile groove. In this way, the toothed sections each form a radially aligned linear guide, allowing the respective winding holder to be radially displaced along the toothed section under centrifugal force.
[0015] It is also advantageous if the respective winding holder is mounted or secured to the respective tooth section with a preload or bracing. This ensures that the winding holder can only be moved radially after the preload on the tooth section has been overcome and guided by the profile groove. The preloaded fastening of the winding holder to the tooth section is achieved automatically by molding the winding holder onto the tooth section.
[0016] It is also advantageous if the tooth cross-section of the tooth sections tapers in a linear guide section from a tooth front facing away from the rotor body to a tooth back facing the rotor body. In this way, undercuts are formed on the narrow sides of the respective tooth section to form the profile groove, so that the respective winding receptacle has only one degree of freedom during the radial displacement guided by the profile groove. The narrow sides of the respective tooth section each extend from a tooth front facing away from the rotor body to a tooth back facing the rotor body.
[0017] It is further advantageous if the tooth sections each have three narrow sides, of which at least the two opposite narrow sides, in particular all three narrow sides, form an undercut in the respective linear guide section. In this way, the tooth sections form the radially aligned linear guide. The undercuts on the narrow sides create a positive connection acting in the axial direction.
[0018] It is also advantageous if the linear guide sections of the toothed sections each have a constant or decreasing maximum tooth width in the radial direction away from the ring section. This enables or facilitates the radial displacement of the winding holders guided by the profile groove.
[0019] It is also advantageous if the winding receptacles of each star disk are enclosed by a winding head sleeve, particularly made of fiber composite material, to support centrifugal force. In this way, the winding receptacles are mechanically supported on the respective winding head sleeve. Furthermore, winding receptacles that have been shifted radially outward are elastically returned to their original position when the load is mechanically relieved by the winding head sleeve. It is also advantageous if the central component and / or the respective winding receptacle are made of plastic. This ensures a low weight of the star disk.
[0020] The invention further relates to an electrically excited synchronous machine with a rotor according to the invention.
[0021] drawing
[0022] An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description.
[0023] They show:
[0024] Fig.1 shows a rotor of an electrically excited synchronous machine with star disks according to the invention in section,
[0025] Fig.2 a section along the line ll-ll in Fig.1 ,
[0026] Fig.3 a star disk according to the invention according to Fig.1,
[0027] Fig.4 a section through the star disc along the line IV-IV in Fig.3,
[0028] Fig.5 a central component of the star disk according to the invention according to Fig.3,
[0029] Fig.6 a view from below of a tooth section of the central component according to Fig.5 and
[0030] Fig.7 a view from below of a profile groove of one of the winding receptacles of the star disk according to Fig.3.
[0031] Description of the embodiment
[0032] Fig.1 shows a section through a rotor of an electrically excited synchronous machine with star disks according to the invention.
[0033] The rotor 1 according to the invention is a rotor of an electrically excited synchronous machine 2 and comprises a rotor body 4, in particular a rotor laminated core, which is rotatable about a rotor axis 3.
[0034] Fig. 2 shows a section of the rotor along the line II-II in Fig. 1. The rotor body 4 has a plurality of salient poles 5 arranged along a circumferential direction of the rotor 1, each having a pole shaft 5.1, each of which is enclosed by an individual coil 6 of an excitation winding 7. According to Fig. 1, a star disk 10 is provided on each of the two end faces of the rotor body 4.
[0035] Fig.3 shows a star disk according to the invention according to Fig.1.
[0036] The star disk 10 according to the invention has a ring section 11, a plurality of tooth sections 12 projecting from the ring section 11 in the radial direction with respect to the rotor axis 3, and winding receptacles 13 formed on the tooth sections 12 for receiving a winding head of the respective individual coil 6. The winding receptacle 13 has, for example, a base body 13.1 fastened to the respective tooth section 12, which has at least one receiving shoulder 13.2 radially on the inside and radially on the outside for forming a winding space for receiving the winding head of the respective individual coil 6.
[0037] The ring section 11 and the tooth sections 12 of the respective star disk 10 form a one-piece central component 14, which is shown as an individual part in Fig.5.
[0038] According to the invention, each winding receptacle 13 is attached as a separate part to a toothed section 12 of the central component 14, in particular by injection molding or plugging.
[0039] Fig.4 shows a section through the star disc along the line IV-IV in Fig.3.
[0040] Each winding receptacle 13 engages around the associated tooth section 12 of the central component 14 on two sides, undercutting it to form a profile groove 17. The profile groove 17 has, in particular, an omega-shaped or T-shaped groove cross-section. The tooth sections 12 of the central component 14 each have a tooth cross-section that corresponds to the groove cross-section of the associated profile groove 17. Fig. 7 shows a bottom view of the profile groove 17 of one of the winding receptacles 13 of the star disk 10 according to Fig. 3.
[0041] The profile groove 17 has a radial longitudinal extent which, according to Fig. 3, is shorter, for example, than the radial longitudinal extent of the winding receptacle 13. The respective winding receptacle 13 therefore projects in the radial direction beyond the respective tooth section 12. The tooth sections 12 of the central component 14 are each designed to allow a radial displacement of the respective winding receptacle 13 on the tooth section 12 under centrifugal force, guided by the profile groove 17. The respective winding receptacle 13 is mounted or fastened on the respective tooth section 12, for example with a preload, wherein the winding receptacle 13 can only be displaced in the radial direction on the tooth section 12 after the preload has been overcome.
[0042] The tooth cross section of the tooth sections 12 tapers in a linear guide section 12L from a tooth front side 12f facing away from the rotor body 4 to a tooth rear side 12b facing the rotor body 4.
[0043] Fig.5 shows a central component of the star disk according to the invention according to Fig.3.
[0044] The linear guide sections 12L of the tooth sections 12 can each have a constant or decreasing maximum tooth width B in the radial direction facing away from the ring section 11.
[0045] Fig.6 shows a view from below of a tooth section of the central component according to Fig.5.
[0046] According to Fig.4 and Fig.6, the tooth sections 12 each have three narrow sides 12s, of which at least the two opposite narrow sides 12s, in particular all three narrow sides 12s, form an undercut in the respective linear guide section 12L. The undercut is formed, for example, by a chamfer-shaped recess extending on the tooth rear side 12b along the respective edge of the respective tooth section 12, for example, along a U-shaped extension. Accordingly, the undercut of the profile groove 17 according to Fig.7 can also extend in a U-shape.
[0047] The winding receptacles 13 of each star disk 10 are arranged according to Fig.1
[0048] Centrifugal support of the winding receptacles 13 is enclosed by a winding head sleeve 18, which is made, for example, of fiber composite material. The central component 14 can be made, for example, of plastic. The respective winding receptacle 13 is designed to be electrically insulating and is made, for example, of plastic.
Claims
Claims 1. Rotor of an electrically excited synchronous machine (2) with a rotor body (4) which is rotatable about a rotor axis (3), in particular a rotor laminated core, which has a plurality of salient poles (5) arranged along a circumferential direction of the rotor (1), each having a pole shaft (5.1), wherein the pole shafts (5.1) the salient poles (5) are each enclosed by an individual coil (6) of a field winding (7), wherein a star disk (10) is provided on each of the two end faces of the rotor body (4), each star disk having an annular portion (11), a plurality of toothed portions (12) projecting from the annular portion (11) in the radial direction with respect to the rotor axis (3), and winding receptacles (13) formed on the toothed portions (12) for receiving a respective winding head of the respective individual coil (6), wherein the annular portion (11) and the toothed portions (12) of the respective star disk (10) form a one-piece central component (14), wherein the winding receptacles (13) form at least one separate part relative to the central component (14), characterized in that each winding receptacle (13) is fastened, in particular injection-molded or plugged-on, as a separate part to a toothed portion (12) of the central component (14).
2. Rotor according to claim 1, characterized in that each winding receptacle (13) engages around the associated tooth section (12) of the central component (14) on at least two sides in an undercut manner to form a profile groove (17) which in particular has an omega-shaped or T-shaped groove cross-section.
3. Rotor according to claim 2, characterized in that the tooth sections (12) of the central component (14) each have a tooth cross-section which is designed to correspond to the groove cross-section of the associated profile groove (17).
4. Rotor according to one of claims 2 or 3, characterized in that the tooth sections (12) of the central component (14) are each designed to allow a radial displacement of the respective winding holder (13) on the tooth section (12) under centrifugal force load, guided by the profile groove (17).
5. Rotor according to one of the preceding claims, characterized in that the respective winding holder (13) is provided with a pre-tension on the respective Tooth section (12) is mounted or fastened, wherein the winding holder (13) is displaceable in the radial direction on the tooth section (12) after overcoming the pretension.
6. Rotor according to one of claims 3 to 5, characterized in that the tooth cross section of the tooth sections (12) tapers in a linear guide section (12L) from a tooth front side (12f) facing away from the rotor body (4) to a tooth rear side (12b) facing the rotor body (4) 7. Rotor according to claim 6, characterized in that the tooth sections (12) each have three narrow sides (12s), of which at least the two opposite narrow sides (12s), in particular all three narrow sides, form an undercut in the respective linear guide section (12L).
8. Rotor according to claim 7, characterized in that the linear guide sections (12L) of the tooth sections (12) each have a constant or decreasing maximum tooth width (B) in the radial direction facing away from the ring section (11).
9. Rotor according to one of the preceding claims, characterized in that the winding receptacles (13) of each star disk are enclosed by a winding head sleeve (18), in particular made of fiber composite material, for centrifugal force support.
10. Rotor according to one of the preceding claims, characterized in that the central component (14) and / or the respective winding holder (13) is made of plastic. 11 . Electrically excited synchronous machine (2) with a rotor (1) according to one of the preceding claims.