Rotor of an electrically excited synchronous machine

Abstract

Rotor of an electrically excited synchronous machine (2) with a rotor body (4) rotatable about a rotor axis (3), in particular a rotor lamination stack, which has several salient poles (5) arranged along a circumferential direction of the rotor (1), each of which has a pole shaft (5.1), wherein the pole shafts (5.1) the salient poles (5) are each enclosed by a single coil (6) of an excitation 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 a ring section (11), several tooth sections (12) projecting radially from the ring section (11) 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 single coil (6), wherein the ring section (11) and the tooth sections (12) of the respective star disk (10) form a one-piece central component (14), wherein the winding receptacles (13) form at least a separate part from the central component (14). characterized by the fact that Each winding receptacle (13) is attached as a separate part to a tooth section (12) of the central component (14), in particular by injection molding or plugging it in.

Description

State of the art

[0001] The invention is based on a rotor of an electrically excited synchronous machine according to the preamble of the main claim.

[0002] 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.

[0003] At high rotor speeds, the winding receptacles of the respective star disks experience 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. Advantages of the invention

[0004] 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.

[0005] 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.

[0006] 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.

[0007] 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.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] Furthermore, it is advantageous if the tooth cross section of the tooth sections tapers in a linear guide section from a tooth front side facing away from the rotor body to a tooth rear side facing the rotor body.

[0012] In this way, undercuts are formed on the narrow sides of each tooth section to form the profile groove, so that the respective winding holder has only one degree of freedom during the radial displacement guided by the profile groove. The narrow sides of each tooth section extend from a tooth front side facing away from the rotor body to a tooth rear side facing the rotor body.

[0013] 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.

[0014] 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.

[0015] 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 forces. This mechanically supports the winding receptacles on the respective winding head sleeve. Furthermore, winding receptacles that have been displaced radially outward are elastically returned to their original position when the winding head sleeve relieves the load.

[0016] Another advantage is that the central component and / or the respective winding holder are made of plastic. This ensures a low weight of the star disk.

[0017] The invention further relates to an electrically excited synchronous machine with a rotor according to the invention. drawing

[0018] An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description.

[0019] They show: Fig. 1 shows a section through a rotor of an electrically excited synchronous machine with star disks according to the invention, Fig. 2 a section along the line II-II in Fig. 1, Fig. 3 a star disk according to the invention Fig. 1, Fig. 4 a section through the star disc along the line IV-IV in Fig. 3, Fig. 5 a central component of the star disk according to the invention according to Fig. 3, Fig. 6 a view from below of a tooth section of the central component according to Fig. 5 and Fig. 7 a view from below of a profile groove of one of the winding holders of the star disc according to Fig. 3. Description of the embodiment

[0020] Fig. 1 shows a section through a rotor of an electrically excited synchronous machine with star disks according to the invention.

[0021] 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.

[0022] Fig. 2 shows a section of the rotor along the line II-II in Fig. 1.

[0023] 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, which is surrounded by a single coil 6 of an excitation winding 7. On the two end faces of the rotor body 4, Fig. 1 a star disk 10 is provided.

[0024] Fig. 3 shows a star disk according to the invention Fig. 1.

[0025] 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 inside and radially outside for forming a winding space for receiving the winding head of the respective individual coil 6.

[0026] The ring section 11 and the tooth sections 12 of the respective star disk 10 form a one-piece central component 14, which is supplied as a single part in Fig. 5 is shown.

[0027] 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.

[0028] Fig. 4 shows a section through the star disk along the line IV-IV in Fig. 3.

[0029] 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 view from below of the profile groove 17 of one of the winding receptacles 13 of the star disk 10 according to Fig. 3.

[0030] The profile groove 17 has a radial longitudinal extension, which Fig. 3 is, for example, shorter than the radial longitudinal extent of the winding holder 13. The respective winding holder 13 thus projects in the radial direction beyond the respective tooth section 12.

[0031] 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 be displaced in a guided radial direction on the tooth section 12, for example, only after the preload has been overcome.

[0032] 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.

[0033] Fig. 5 shows a central component of the star disk according to the invention Fig. 3.

[0034] 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.

[0035] Fig. 6 shows a view from below of a tooth section of the central component according to Fig. 5.

[0036] After 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 that extends 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 can be Fig. 7 also extend in a U-shape.

[0037] The winding holders 13 of each star disk 10 are Fig. 1 for centrifugal force support of the winding receptacles 13 is enclosed by a winding head sleeve 18, which is formed, for example, from fiber composite material.

[0038] The central component 14 can be made of plastic, for example. The respective winding holder 13 is electrically insulating and made of plastic, for example. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 102021129951 A1

[0002]

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 an excitation 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 section (11), a plurality of tooth sections (12) projecting from the annular 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), wherein the annular section (11) and the tooth sections (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 with respect to the central component (14), . characterized by that each winding receptacle (13) is attached as a separate part to a toothed section (12) of the central component (14), in particular injection-molded or plugged on. [2] Rotor according to claim 1, characterized bythat 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 by 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 by 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) guided by the profile groove (17) under centrifugal force load. [5] Rotor according to one of the preceding claims, characterized bythat the respective winding holder (13) is mounted or fastened with a preload on the respective tooth section (12), wherein the winding holder (13) is displaceable in the radial direction on the tooth section (12) after overcoming the preload. [6] Rotor according to one of claims 3 to 5, characterized by 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 by 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 bythat 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 by 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 by 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.

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