Patent Publication Number: US-2022224175-A1

Title: Stator support and stator

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims priority to Chinese Patent Application No. 201910447712.0, titled “STATOR SUPPORT AND STATOR” and filed on May 27, 2019, which is hereby incorporated by reference in its entirety. 
     TECHNICAL FIELD 
     The present disclosure relates to a technical filed of electric motors, and particularly relates to a stator support and a stator. 
     BACKGROUND 
     As a single-machine power of a wind-power electric generator set becomes larger and larger, an outer diameter of an electric motor becomes larger and larger. If an outer diameter of a large-diameter electric motor exceeds a road transportation limiting value, for example, greater than 5 m, the transportation difficulty and the cost of the electric motor will be increased. 
     SUMMARY 
     The object of the present disclosure is to provide a stator support and a stator; the stator support can at least arrange a stator ring connected with a stator iron core of an electric motor in segments in a circumferential direction to facilitate transportation. 
     In one aspect, the stator support is provided by the present disclosure. The stator support is applied to a large-diameter electric motor. The stator support includes a stator shaft, being coaxially connectable to a fixing shaft of the electric motor; a supporting assembly, coaxially arranged at an outer circumference of the stator shaft; a stator ring, being connectable to a stator iron core of the electric motor, in which the stator ring includes two or more stator ring segments continuously distributed in a circumferential direction of its own, each of the stator ring segments is in a sector shape, and the two or more stator ring segments are coaxially arranged at an outer circumference of the supporting assembly. 
     In another aspect, the stator is provided by the present disclosure. The stator includes the stator support as described above; a stator iron core, detachably connected to an outer circumference of the stator ring of the stator support, and including two or more stator iron core segments distributed in the circumferential direction of its own; and a stator winding set, including two or more stator winding set segments distributed in a circumferential direction of its own, in which the stator winding set segments are arranged in the stator iron core segments. 
     In the stator support and the stator provided by the present disclosure, the stator ring connected with the stator iron core of the electric motor is divided into two or more stator ring segments in the circumferential direction, so that a maximum contour dimension of each of the stator ring segments can be controlled within the transportation limiting value, thereby solving the difficult transportation problem of the stator support of the large-diameter electric motor. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present disclosure can be better understood from the following description of the specific embodiments of the present disclosure in conjunction with the drawings; herein, by reading the following detailed description of the non-limiting embodiments with reference to the drawings, other features, objects, and advantages of the present disclosure will become more apparent, and the same or similar reference signs indicate the same or similar features. 
         FIG. 1  shows a structural schematic view of a stator support according to an embodiment of the present disclosure; 
         FIG. 2  shows a structural schematic view of a stator ring segment in the stator support shown in  FIG. 1 ; 
         FIG. 3  shows a structural schematic view of a base plate in the stator support shown in  FIG. 1 ; 
         FIG. 4  shows a structural schematic view of a stator shaft and a supporting assembly in the stator support shown in  FIG. 1 ; 
         FIG. 5  shows a structural schematic view of another stator ring segment in the stator support shown in  FIG. 1 ; 
         FIG. 6  shows a schematic longitudinal sectional view of the stator shaft and the supporting assembly shown in  FIG. 4 ; 
         FIG. 7  shows an exploded structural schematic view of a stator shaft and a supporting assembly in another stator support provided by an embodiment of the present disclosure; 
         FIG. 8  shows a structural schematic view of a stator according to an embodiment of the present disclosure. 
     
    
    
     In the drawings: 
       1 —stator shaft;  11 —cylinder-shaped body;  12 —fixing portion;  13 —inner flange;  2 —supporting assembly;  21 —connecting arm;  211 —first connecting portion;  212 —second connecting portion;  3 —stator ring;  31 —stator ring segment;  311 —connecting face;  312 —first extension portion;  313 —second extension portion;  314 —fixing groove; H 1 —first through hole; H 2 —second through hole;  4 —connecting assembly;  41 —base plate;  5 —pressing strip;  51 —mounting rail;  511 —first mounting rail;  512 —second mounting rail;  6 —fastening member;  7 —fixing member; 
       10 —stator support;  20 —stator iron core;  201 —stator iron core segment. 
     DETAILED DESCRIPTION 
     The features and exemplary embodiments of various aspects of the present disclosure will be described in detail below. Many specific details are disclosed in the following detailed description in order to fully understand the present disclosure. However, it is obvious to those skilled in the art that the present disclosure can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present disclosure by showing examples of the present disclosure. The present disclosure is by no means limited to any specific configurations and algorithms proposed below, but covers any modification, replacement and improvement of elements, member and algorithms without departing from the spirit of the present disclosure. In the drawings and the following description, well-known structures and technologies are not shown in order to avoid unnecessary obscurity of the present disclosure. 
     In order to better understand the present disclosure, a stator support and a stator provided by some embodiments of the present disclosure will be described in detail below in conjunction with  FIG. 1  to  FIG. 8 . 
     Referring to  FIG. 1 , the stator support  10  is provided by an embodiment of the present disclosure. The stator support  10  is applied to a large-diameter electric motor. The stator support  10  includes a stator shaft  1 , a supporting assembly  2  and a stator ring  3 . 
     The stator shaft  1  can be coaxially connected to a fixing shaft of the electric motor; the stator shaft  1  is generally formed by means of machining process after adopting a steel material for integral casting. 
     The supporting assembly  2  is coaxially arranged at an outer circumference of the stator shaft  1  to improve the bearing capacity of the stator shaft  1 . 
     The stator ring  3  can be connected to a stator iron core of the electric motor; the stator ring  3  includes two or more stator ring segments  31  continuously distributed in a circumferential direction of its own, each of the stator ring segments  31  is in a sector shape, and the two or more stator ring segments  31  are coaxially arranged at an outer circumference of the supporting assembly  2 . 
     The stator ring  3  is generally formed by means of machining process after adopting the steel material for integral casting or welding. After the stator ring  3  is manufactured in a processing site, it can be divided into two or more, such as  6 , stator ring segments  31  in the circumferential direction by means of laser cutting or the like, and a circumferential angle occupied by each of the stator ring segments  31  is 60°. 
     In order to ensure a vacuum pressure impregnation process requirement of a stator winding set arranged in the stator iron core, a maximum contour dimension of each of the stator ring segments  31 , that is, a dimension of a maximum chord length, needs to be smaller than a dimension of an inner diameter of a paint dipping tank in the factory. On the other hand, the dimension of the maximum chord length of each of the stator ring segments  31  is controlled within the transportation limiting value. For example, the dimension of the maximum chord length of each of the stator ring segments  31  is less than 4.5 m, which is convenient for transporting two or more stator ring segments  31  from the processing site to an assembling site. 
     In the stator support  10  provided by the embodiments of the present disclosure, at least the stator ring  3  connected with the stator iron core of the electric motor is divided into two or more stator ring segments  31  in the circumferential direction, so that the maximum contour dimension of each of the stator ring segments can be controlled within the transportation limiting value, thereby solving the difficult transportation problem of the stator support  10  of the large-diameter electric motor. 
     A specific structure of the stator support  10  will be described in further detail below with reference to the drawings. 
     Referring to  FIG. 1  to  FIG. 3  together, the stator support further includes a connecting assembly  4 , and two adjacent stator ring segments  31  are fixed to each other in the circumferential direction by the connecting assembly  4 . 
     Specifically, two ends of each of the stator ring segments  31  in the circumferential direction of its own respectively have two connecting faces  311 , and each of the connecting faces  311  is provided with a first through hole H 1  penetrating in an axial direction. The number of the first through holes H 1  may be two or more. 
     The connecting assembly  4  includes a base plate  41  and a fastening member (not shown in the drawings). The base plate  41  is attached to two adjacent connecting faces  311  of the two adjacent stator ring segments  31  on at least one side of in the axial direction, second through holes H 2  corresponding to positions of the first through holes H 1  of the two adjacent connecting faces  311  are formed on the base plate  41 , and the number of the second through holes H 2  may be four or more. The fastening member can pass through the second through holes H 2  and the first through holes H 1  to connect the base plate  41  with two adjacent stator ring segments  31 . 
     Optionally, two base plates  41  are respectively attached to the two adjacent connecting faces  311  corresponding to two sides in the axial direction of the two adjacent stator ring segments  31 , so as to improve the connecting strength of the two adjacent stator ring segments  31  in the circumferential direction. 
     In order to facilitate the assembly and disassembly of the stator support  10 , the stator shaft  1  and/or the stator ring segments  31  are detachably connected to the supporting assembly  2 . Herein, the supporting assembly  2  includes two or more connecting arms  21  radiatingly distributed on the outer circumference of the stator shaft  1 . 
     Referring to  FIG. 2  and  FIG. 4  together, the stator ring segments  31  are detachably connected to the supporting assembly  2 , and optionally, the number of the stator ring segments  31  and the number of connecting arms  21  are equal, for example, each of the numbers is  6 . Each of the stator ring segments  31  is provided with first extension portions  312 , the first extension portions  312  are respectively arranged at two ends of each of the stator ring segments  31  in the circumferential direction of its own; each of the connecting arms  21  is provided with a first connecting portion  211 , and two adjacent first extension portions  312  of two adjacent stator ring segments  31  are matched with the first connecting portion  211 , so that each two adjacent stator ring segments  31  are detachably connected to one of the connecting arms  21 . 
     In some embodiments, either of the first extension portions  312  and the first connecting portion  211  can be stacked with the other one; the fastening member can pass through the two adjacent first extension portions  312  and the first connecting portion  211  to detachably connect the two stator ring segments  31  to one of the connecting arms  21 . 
     In some embodiments, either of the first extension portions  312  and the first connecting portion  211  may form a first convex structure protruding toward the other one, and the other one may form a first concave structure matching with the first convex structure; two adjacent first convex structures are arranged to be inserted into the first concave structure, or the first convex structure is inserted into two adjacent first concave structures, so as to detachably connect the two stator ring segments  31  to one of the connecting arms  21 . 
     In order to improve the connecting strength between the first extension portions  312  and the first connecting portion  211 , two adjacent first extension portions  312  and the first connecting portion  211  may also be connected together by the fastening member. 
     Referring to  FIG. 5 , in some embodiments, the number of the stator ring segments  31  is less than the number of the connecting arms  21 , for example, the number of the stator ring segments  31  is  3  and the number of the connecting arms  21  is  6 . In addition to the first extension portions  312  arranged at the two ends of each of the stator ring segments  31  in the circumferential direction, each of the stator ring segments  31  may be further provided with a second extension portion  313  arranged to be spaced apart from the first extension portions  312 , and the second extension portion  313  is matched with the first connecting portion  211  of each of the connecting arms  21 . In order to improve the versatility of the connecting arms  21 , a dimension of the second extension portion  313  in the circumferential direction and a dimension of the second extension portion  313  in the radial direction are the same as a dimension of the two adjacent first extension portions  312  in the circumferential direction and a dimension of the two adjacent first extension portions  312  in the radial direction respectively, and a detachable connecting manner between the second extension portion  313  and one of the connecting arms  21  is similar to a detachable connecting manner between the first extension portions  312  and one of the connecting arms  21 , and will not be repeated here. 
     Referring to  FIG. 6 , an inner flange  13  is arranged at an end of the stator shaft  1  in the axial direction, a threaded hole is formed on an end face of the inner flange  13 , and a corresponding flange structure is generally arranged at an outer circumference of the fixing shaft, and the stator shaft  1  is coaxially connected with the fixing shaft through the inner flange  13 . 
     Referring to  FIG. 7 , in order to be able to transport the stator support  10  with a larger diameter, the stator shaft  1  is detachably connected with the supporting assembly  2 , the stator shaft  1  includes a cylinder-shaped body  11  and two or more fixing portions  12  arranged at an outer circumference of the cylinder-shaped body  11 , and the two or more connecting arms  21  are connected to the two or more fixing portions  12  in a one-to-one correspondence. 
     Since the supporting assembly  2  is detachably connected with the stator shaft  1 , various connecting arms  21  of the stator shaft  1  and the supporting assembly  2  can be transported separately, so that a maximum dimension of the stator shaft  1  and a maximum dimension of the connecting arm  21  can be controlled within the transportation limiting value, and a diameter dimension of the stator shaft  1  can also be made larger to meet the operation requirements. 
     Specifically, the connecting arms  21  respectively have second connecting portions  212  facing to the fixing portions  12 , and the fixing portions are respectively matched with the second connecting portions  212 , so that the stator shaft  1  is detachably connected to two or more connecting arms  21 . 
     In some embodiments, either of the fixing portion  12  and the second connecting portion  212  can be stacked with the other one, and the fastening member passes through the fixing portion  12  and the second connecting portion  212  to detachably connect the stator shaft  1  to the connecting arms  21 . 
     In some embodiments, either of the fixing portion  12  and the second connecting portion  212  may form a second convex structure protruding toward the other one, and the other one may form a second concave structure matching with the second convex structure; the second convex structure is arranged to be inserted into the second concave structure, so as to detachably connect the two stator ring segments  31  to one of the connecting arms  21 . 
     In order to improve the connecting strength between the fixing portion  12  and the second connecting portion  212 , the fixing portion  12  and the second connecting portion  212  may also be connected together by the fastening member. 
     In addition, as shown in  FIG. 2 , a fixing groove  314  recessed inward is formed at a side of the stator ring segment  31  away from the connecting arm  21  in the radial direction, and the stator ring segment  31  is connected to a stator iron core segment arranged in segments through the fixing groove  314 . The fixing groove  314  may be, for example, but not limited to, a dovetail groove. 
     Thus, in the stator support  10  provided by the embodiments of the present disclosure, the stator shaft  1  and/or the stator ring segments  31  are detachably connected to the connecting arms  21  of the supporting assembly  2 , the connecting arms  21 , the stator shaft  1  and the stator ring segments  31  of the stator support  10  can be designed in a modularity, so as to improve the processing accuracy of each of modular components, so that it is conducive to reducing costs. 
     Referring to  FIG. 8 , the stator is provided by the embodiments of the present disclosure. The stator includes any stator support  10  as described above, the stator iron core  20  and the stator winding set (not shown in the drawings). 
     The stator iron core  20  is detachably connected to an outer circumference of the stator ring  3  of the stator support  10 , and the stator iron core  20  includes two or more stator iron core segments  201  distributed in the circumferential direction of its own. The stator iron core segments  201  are generally made of laminated silicon steel sheets, and each of the stator iron core segments  201  is respectively and correspondingly arranged on the outer circumference of the stator ring segments  31 . 
     The stator winding set includes two or more stator winding set segments distributed in the circumferential direction of its own, and the stator winding set segments are arranged in the stator iron core segments  201 . 
     The stator provided by the embodiments of the present disclosure adopts the stator support  10  as describe above, which can improve the convenience of transporting the stator support  10  of the electric motor with a larger diameter. 
     Those skilled in the art should understand that the above-mentioned embodiments are all illustrative and not limited. Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Those skilled in the art should be able to understand and implement other modified embodiments of the disclosed embodiments on the basis of studying the drawings, description, and claims. In the claims, the term “including” does not exclude other means or steps; when an article is not modified with a quantitative word, it is intended to include one/kind or multiple/kind of articles, and can be used interchangeably with “one/kind or multiple/kind of articles; the terms “first” and “second” are used to denote names rather than to indicate any specific order. Any reference signs in the claims should not be understood as limiting the scope of protection. The functions of multiple parts appearing in the claims can be implemented by a single hardware or software module. The appearance of certain technical features in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.