Stator punching sheet and stator core

Abstract

The utility model discloses a stator punching sheet, which comprises a magnet yoke, stator teeth and a tooth boot, the magnet yoke and the stator teeth are integrally formed, the tooth boot is detachable and is provided with a connecting bulge and a boot part, the width of the boot part is greater than that of the stator teeth, one end of the stator teeth far away from the magnet yoke is provided with a connecting groove, and the connecting groove and the connecting bulge are complementary in shape. The connection protrusion has, in a radially inward direction, a first positioning portion protruding in a circumferential direction, a second positioning portion recessed in the circumferential direction, and a linear transition portion connected to the shoe portion, a circumferential width of the linear transition portion gradually widening in the radially inward direction. The utility model discloses a stator core.

Description

Technical Field

[0001] The utility model relates to a stator punching sheet and a stator iron core composed of the stator punching sheet. Background Art

[0002] When in use, a mill requires an electric motor to drive the mill barrel. A traditional mill drive system consists of a drive motor, a reduction gear, a pinion shaft, and a large gear. During operation, the drive motor drives the reduction gear, which in turn drives the pinion shaft, which in turn drives the large gear, which in turn drives the mill barrel to rotate and achieve grinding. This drive system involves numerous transmission links, each of which consumes energy, machinery, lubrication, and space. This results in low energy utilization and transmission efficiency for the entire drive system, significantly increasing energy, machinery, and lubrication consumption.

[0003] As an improvement plan, there is a ring motor that can directly drive the mill cylinder to rotate. However, the structure of the stator core of the existing ring motor and the stator punching sheets used to constitute the stator core are not ideal. It has problems such as the stator punching sheets being difficult to assemble, the structural strength of the detachable tooth boots being low, and being easily damaged or broken during the assembly process. Utility Model Content

[0004] In response to the above problems, according to the first aspect of the present utility model, a stator punching sheet is proposed, which includes a yoke, stator teeth and tooth boots; the yoke and the stator teeth are integrally formed, the tooth boots are detachable and have connecting protrusions and boots, the width of the boots is greater than the width of the stator teeth; the stator teeth have connecting grooves at the end away from the yoke; the connecting grooves and the connecting protrusions are complementary in shape; the connecting protrusions have a first positioning portion, a second positioning portion and a straight transition portion in the radially inward direction; the first positioning portion protrudes in the circumferential direction, the second positioning portion is recessed in the circumferential direction, the circumferential width of the straight transition portion gradually widens in the radially inward direction, and the straight transition portion is connected to the boots.

[0005] In an embodiment of the present invention, the first positioning portion and the second positioning portion have smooth contours.

[0006] In an embodiment of the present invention, the contours of the first positioning portion and the contours of the second positioning portion are in an "S"-shaped transition.

[0007] In an embodiment of the present invention, the contours of the first positioning portion, the second positioning portion, and the straight transition portion are bilaterally symmetrical along the radial direction.

[0008] In an embodiment of the present invention, the circumferential width of the straight transition portion is greater than the circumferential width of the second positioning portion.

[0009] In an embodiment of the present invention, a plurality of riveting points are provided on the tooth shoe.

[0010] In an embodiment of the present invention, the first riveting point is arranged on a center line of the connecting protrusion.

[0011] In an embodiment of the present invention, the first riveting point is arranged at the center of the second positioning portion.

[0012] In an embodiment of the present invention, the second rivet points and the third rivet points are symmetrically arranged in a circumferential direction of the shoe.

[0013] According to a second aspect of the present invention, a stator core is provided. The stator core is formed by stacking the stator punching sheets according to the above embodiments of the present invention.

[0014] The present invention further relates to a ring-shaped permanent magnet motor, which may have one or more features of the above-mentioned embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention. The drawings are only used to illustrate some embodiments of the present invention, and are not intended to limit all embodiments of the present invention to these drawings.

[0016] Figure 1 2 is a diagram of a ring motor according to an embodiment of the present invention.

[0017] Figure 2 FIG. 1 is a view of one of the sub-housings in an embodiment in which the housing is configured to be composed of four sub-housings.

[0018] Figure 3 for Figure 2 A partial enlarged view of the sub-housing shown,

[0019] Figure 4 Schematic diagram of the stator core installation structure according to an embodiment of the present invention.

[0020] Figure 5 Schematic diagram of a stator punching sheet according to an embodiment of the present utility model.

[0021] Figure 6 Schematic diagram of the integrally formed yoke and stator teeth of the stator punching sheet according to an embodiment of the present invention.

[0022] Figure 7is a schematic diagram of a detachable tooth shoe of a stator punching sheet according to an embodiment of the utility model, and

[0023] Figure 8 Schematic diagram of a grinding mill according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the specific embodiments of the present invention. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar terms used in the specification and claims of the present utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0026] The present invention will be described in detail below by describing exemplary embodiments.

[0027] The utility model provides a stator punching sheet and a stator core composed of the stator punching sheet. The stator core is a component of a ring-shaped motor, and the ring-shaped motor can be used to manufacture a grinding machine.

[0028] See attached Figure 1-3 , Figure 1 2 is a diagram of a ring motor according to an embodiment of the present invention. Figure 2 FIG. 1 is a view of one of the sub-housings in an embodiment in which the housing is configured to be composed of four sub-housings. Figure 3 for Figure 2 A partial enlarged view of the sub-housing shown.

[0029] As shown in the figure, the ring-shaped motor according to the embodiment of the present invention includes: a housing 1, a stator assembly 2 and a rotor assembly 3. The housing 1 is constructed in an annular shape and has a radial inner wall 10, and the housing 1 defines an inner cavity 14 therein. Preferably, the housing 1 may include at least two sub-housings spliced together in the circumferential direction. In the embodiment shown in the drawings, the housing 1 is formed by four sub-housings, and each sub-housing has a substantially identical structure. The stator assembly 2 is mounted on the radial inner wall 10 on the side opposite to the inner cavity 14. The rotor assembly 3 is mounted on the radial inner side of the stator assembly 2. The rotor assembly 3 has a mounting portion to fix the driven component on the radial inner side of the rotor assembly 3.

[0030] Unlike prior art structures that use a simple frame or a single annular plate to mount the stator assembly, the present invention utilizes an annular housing with an inner cavity to mount the stator assembly, providing stronger and more stable structural support for the stator assembly and, ultimately, the entire ring-shaped motor. Furthermore, compared to prior art structures in which the stator assembly is enclosed within the housing, since the stator assembly is mounted on the radial outer wall opposite the inner cavity of the housing, heat from the stator assembly can be directly transferred through the radial outer wall to the housing and then dissipated to the external environment, further improving the stator assembly's heat dissipation. Therefore, the present ring-shaped motor is particularly suitable for mechanical equipment such as grinding mills that experience heavy workloads and harsh operating conditions.

[0031] Preferably, see Figure 3 and Figure 4 The stator assembly 2 further includes a stator core 21, which is secured to the radial inner wall 10 by a securing member extending through the radial inner wall 10. It should be understood that the securing member may be any suitable device or apparatus, as long as it can secure the stator assembly to the radial outer wall on the side opposite the inner cavity. The stator core 21 may be integrally formed from a suitable magnetic material, or may be formed by stacking stator laminations, as described below.

[0032] Figure 5A schematic diagram of a stator punching sheet 50 according to an embodiment of the present invention is shown. The stator punching sheet 50 includes a yoke 51, stator teeth 52 and tooth shoes 53. The yoke 51 and the stator teeth 52 are integrally formed. The tooth shoes 53 are detachable relative to the integrally formed yoke 51 and stator teeth 52. A plurality of stator punching sheets 50 are stacked to form the stator core 21. Before the stator winding is arranged on the stator core 21, the tooth shoes 53 (or the stacked tooth shoes 53) are not assembled to the integrally formed (stacked) yoke 51 and the stator teeth 52, so the gap between the stator teeth 52 is large, and the stator winding can be conveniently arranged between the stator teeth 52 in the radial direction. After the stator winding is arranged, the tooth shoes 53 are assembled to the integrally formed (stacked) yoke 51 and the stator teeth 52. On the one hand, the tooth shoes 53 can fix the winding in the stator slots between the stator teeth 52 , and on the other hand, the tooth shoes 53 can reduce the stator slot gap, thereby reducing magnetic leakage.

[0033] The stator tooth 52 has a connecting slot 61 at one end away from the yoke 51. Figure 6 The tooth shoe 53 has a connecting protrusion 62 at the first end facing the stator tooth 52. Figure 7 . The profile of the connecting groove 61 and the profile of the connecting protrusion 62 are identical or complementary to each other. The stator tooth 52 can be assembled using its connecting protrusion 62, in particular, inserted into the connecting groove 61 of the stator tooth 52 in the axial direction, and the connecting protrusion 62 and the connecting groove 61 can fit together tightly without any gap.

[0034] Figure 7 FIG. 5 shows a schematic diagram of a detachable tooth shoe 53 of a stator sheet 50 according to an embodiment of the present invention. Figure 7 As shown, the tooth shoe 53 has a connecting protrusion 62 and a shoe portion 63 . The width of the shoe portion 63 is greater than the width of the connecting protrusion 62 and greater than the width of the stator tooth 52 .

[0035] The connecting protrusion 62 has a first positioning portion 71, a second positioning portion 72, and a straight transition portion 73 in the radially inward direction of the stator core 21. The first positioning portion 71 protrudes in the circumferential direction of the stator core 21, the second positioning portion 72 is recessed in the circumferential direction, and the circumferential width of the straight transition portion 73 gradually widens in the radially inward direction. The straight transition portion 73 is connected to the shoe 63.

[0036] The dual-positioning structure of the first and second positioning portions 71, 72 increases the contact area between the connecting grooves 61 and the connecting protrusions 62, thereby strengthening the connection between the stator teeth 52 and the tooth shoes 53. The linear transition portion 73 is widest at the end closest to the shoe 63, which improves the connection strength between the connecting protrusions 62 and the shoe 63 and avoids the risk of disconnection due to stress.

[0037] In the embodiment of the present invention, the contours of the first positioning portion 71 and the second positioning portion 72 can be, for example, smooth, and in particular, arc-shaped. Preferably, the contours of the first positioning portion and the second positioning portion can be, for example, S-shaped transitions.

[0038] In the embodiment of the present invention, the contours of the first positioning portion 71, the second positioning portion 72 and the straight transition portion 73 may be bilaterally symmetrical along the radial direction. Figure 5 and Figure 7 As shown in .

[0039] In the embodiment according to the present invention, the width of the straight transition portion 63 along the circumferential direction, that is, the circumferential width, may be greater than the circumferential width of the second positioning portion 72 .

[0040] In an embodiment of the present invention, multiple rivet points may be provided on the tooth shoe 53. A first rivet point 81, a second rivet point 82, and a third rivet point 83 may be used to secure multiple stator laminations 50 together in a stacked manner. Preferably, the first rivet point 81 may be provided on the centerline of the connecting protrusion 82. Further preferably, the first rivet point 81 may be provided at the center of the second positioning portion 72. In an embodiment of the present invention, the second rivet points 82 and the third rivet points 83 are symmetrically arranged in the circumferential direction of the shoe 63.

[0041] Placing the first rivet point 81 on the narrower second positioning portion 72 reduces the impact of the concavity of the second positioning portion 72 on the structural strength, thereby ensuring the structural strength of the second positioning portion 72. The second and third rivet points 82, 83 are located at both ends of the narrower boot portion 63, thereby ensuring the structural strength of the boot portion 63. The first, second, and third rivet points 81, 82, 83 collectively reduce the structural strength of the toothed boot 53.

[0042] The present invention also relates to a stator core 21, which is formed by stacking stator punching sheets 50 according to the embodiment of the present invention. Figure 2 、 3 and as shown in 4.

[0043] The utility model also provides a grinding machine, see Figure 8 The cylinder 8 is fixedly mounted on the radial inner side of the rotor assembly 3. For example, the cylinder 8 can be mounted on the middle mounting portion 33 of the mounting portion by bolts. Although not shown, it should be understood that the cylinder 8 of the mill can be supported at its axial ends by structures consisting of necessary bearings, brackets, etc., so that the cylinder 8 and the rotor assembly 3 can rotate stably together.

[0044] The exemplary implementation of the ring motor proposed in the present invention is described in detail above with reference to the preferred embodiments. However, it can be understood by those skilled in the art that, without departing from the concept of the present invention, various variations and modifications can be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present invention can be combined in various ways without exceeding the scope of protection of the present invention.

Claims

1. A stator punching sheet, characterized in that: The stator punching sheet includes a yoke, a stator tooth and a tooth shoe. The yoke and the stator tooth are integrally formed. The tooth shoe is detachable and has a connecting protrusion and a shoe portion. The width of the shoe portion is greater than the width of the stator tooth. The stator tooth has a connecting groove at one end away from the yoke. The connecting groove and the connecting protrusion are complementary in shape, The connecting protrusion has a first positioning portion, a second positioning portion and a straight transition portion in the radially inward direction. The first positioning portion protrudes in the circumferential direction, the second positioning portion is recessed in the circumferential direction, the circumferential width of the straight transition portion gradually widens in the radially inward direction, and The straight transition portion is connected to the shoe portion.

2. The stator sheet according to claim 1, characterized in that: The first positioning portion and the second positioning portion have smooth contours.

3. The stator sheet according to claim 1, characterized in that: The profile of the first positioning portion and the profile of the second positioning portion are in an "S"-shaped transition.

4. The stator sheet according to claim 1, characterized in that: The first positioning portion, the second positioning portion and the straight transition portion have profiles that are bilaterally symmetrical along a radial direction.

5. The stator punching sheet according to claim 1, characterized in that: The circumferential width of the straight transition portion is greater than the circumferential width of the second positioning portion.

6. The stator punching sheet according to claim 1, characterized in that: A plurality of riveting points are arranged on the tooth shoe.

7. The stator sheet according to claim 1, characterized in that: The first rivet point is arranged on the center line of the connecting protrusion.

8. The stator punching sheet according to claim 1, characterized in that: The first rivet point is disposed at the center of the second positioning portion.

9. The stator punching sheet according to claim 1, characterized in that: The second rivet points and the third rivet points are symmetrically arranged in a circumferential direction of the shoe.

10. A stator core, characterized in that: The stator core is formed by stacking stator laminations according to any one of claims 1 to 9.

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