Annular motor and mill

Abstract

The utility model discloses an annular motor and a mill. The annular motor comprises a stator assembly (2), a rotor assembly (3) surrounded by the stator assembly (2), and a first shield (71) located on one side of the stator assembly (2) and the rotor assembly (3). Wherein a first labyrinth seal structure is formed between the first shield (71) and the rotor assembly (3).

Description

Technical Field

[0001] The present disclosure relates to a ring motor and a grinding mill. 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, there are ring-shaped motors that can directly drive the mill barrel. However, existing ring-shaped motor rotors have several drawbacks. For example, the rotors are large, the magnets have strong magnetic force, and the attraction between the magnets and the stator during installation is also very strong, making installation very difficult and potentially posing a safety hazard. For another example, ring-shaped motors are often used in dusty environments, which places high demands on the seal between the stator and rotor. Furthermore, the rotors suffer from problems such as irrational structural design, inconvenient connection to the mill barrel, and low structural strength. Utility Model Content

[0004] In view of the above problems, according to a first aspect of the present disclosure, a ring-shaped motor is proposed. The ring-shaped motor may have one or more of the following features.

[0005] According to one embodiment, a ring-shaped motor includes: a stator assembly; a rotor assembly surrounded by the stator assembly; and a first shield located on one side of the stator assembly and the rotor assembly, wherein a first labyrinth seal structure is formed between the first shield and the rotor assembly.

[0006] According to one embodiment, the rotor assembly comprises a rotor mounting portion for holding the punching sheets, wherein a first axial end portion of the rotor mounting portion has a sealing structure portion for forming a first labyrinth sealing structure.

[0007] According to one embodiment, the sealing structure is one or more annular grooves open in the axial direction, and the first shield has one or more annular protrusions extending into the one or more grooves.

[0008] According to one embodiment, the sealing structure is two annular grooves open in the axial direction, and the first shield has two annular protrusions extending into the two annular grooves.

[0009] According to one embodiment, the sealing structure is an annular groove opened in the radial direction, and the distal end of the first shield extends into the annular groove.

[0010] According to one embodiment, the ring-shaped motor further comprises a fan configured to form a cooling airflow inside the ring-shaped motor, wherein the cooling airflow can leave the ring-shaped motor via the first labyrinth sealing structure.

[0011] According to one embodiment, the ring motor further comprises a housing surrounding the stator assembly, the first shield being fixed to the housing.

[0012] According to one embodiment, at least one support member supported between the first shield and the housing is further included.

[0013] According to one embodiment, the ring motor further comprises a second shield located on the other side of the stator assembly and the rotor assembly, wherein a second labyrinth sealing structure is formed between the second shield and the rotor assembly, and the second labyrinth sealing structure is the same as the first labyrinth sealing structure.

[0014] According to a second aspect of the present disclosure, a grinding mill is provided, comprising the ring motor described in any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 1 shows an overall view of a rotor assembly according to an exemplary embodiment of the present disclosure;

[0017] Figure 2 Shown Figure 1 A partial view of the rotor assembly;

[0018] Figure 3 Shown Figure 1 A sectional view of the rotor assembly taken along a plane perpendicular to the axial direction;

[0019] Figure 4 Shown Figure 1 A partial view of the rotor assembly as viewed from the inside;

[0020] Figure 5 Shown Figure 1 A partial enlarged view of the rotor assembly;

[0021] Figure 6 Shown Figure 1A partial enlarged view of the rotor assembly, wherein the mounting ribs are hidden;

[0022] Figure 7A Shown from another perspective Figure 1 A partial enlarged view of the rotor assembly;

[0023] Figure 7B The structure near the positioning step of the rotor assembly is shown;

[0024] Figure 8 Shown Figure 1 a partial portion of a rotor assembly;

[0025] Figure 9 Shown from another perspective Figure 1 a partial portion of a rotor assembly;

[0026] Figure 10 A cross-sectional view of a ring motor and a first embodiment of a labyrinth seal structure are shown;

[0027] Figure 11 A second embodiment of a labyrinth seal structure is shown;

[0028] Figure 12 shows an overall view of the ring motor;

[0029] Figure 13 Shown Figure 9 Magnified view of the circled portion;

[0030] Figure 14 A partial view of a ring motor is shown, in particular showing the support.

[0031] Reference Signs List

[0032] 1 housing

[0033] 2 stator assembly

[0034] 3 rotor assembly

[0035] 4 cooling channels

[0036] 9 fan

[0037] 10 rotor mounting part

[0038] 11 Installation strip groove

[0039] 12 First installation part

[0040] 13 Second installation part

[0041] 14 Middle mounting part

[0042] 15 first reinforcement rib

[0043] 16 Second reinforcement rib

[0044] 17 first axial end

[0045] 18 second axial end

[0046] 20 Install the ribs

[0047] 21 First rib part

[0048] 22 Second rib part

[0049] 23 middle rib part

[0050] 30 film processing units

[0051] 31 punching strip groove

[0052] 32 magnetic tile installation slots

[0053] 33 fixed plate

[0054] 34 bolts

[0055] 35 nut

[0056] 36 fasteners

[0057] 37 mounting holes

[0058] 40 magnetic tiles

[0059] 71 First Shield

[0060] 72 Second Shield

[0061] 73 support parts

[0062] 74 annular groove

[0063] 100 radial inner wall

[0064] 101 positioning steps

[0065] 102 sidewall

[0066] 103 radial outer wall

[0067] 104 inner cavity

[0068] 105 exhaust holes

[0069] 111 first groove end

[0070] 112 second groove end

[0071] 121 first mounting flange

[0072] 122 Installing the avoidance channel

[0073] 123 flange mounting hole

[0074] 124 Second mounting flange

[0075] 141 axial through hole

[0076] g gap DETAILED DESCRIPTION

[0077] In order to make the purpose, technical solution and advantages of the technical solution of the present disclosure clearer, the technical solution of the embodiment of the present disclosure will be clearly and completely described below in conjunction with the drawings of the specific embodiments of the present disclosure. 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 disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0078] 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 disclosure belongs. The words "first", "second" and similar terms used in the patent application specification and claims of the present disclosure 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.

[0079] The rotor assembly and its specific structure, the annular motor with the rotor assembly, and the grinding mill with the annular motor proposed in the present disclosure are described in detail below by describing exemplary embodiments in conjunction with the accompanying drawings. Figure 1 shows an overall view of a rotor assembly according to an exemplary embodiment of the present disclosure; Figure 2 Shown Figure 1 A partial view of the rotor assembly; Figure 3 Shown Figure 1 A sectional view of the rotor assembly taken along a plane perpendicular to the axial direction; Figure 4 Shown Figure 1 A partial view of the rotor assembly as viewed from the inside; Figure 5 Shown Figure 1 A partial enlarged view of the rotor assembly; Figure 6 Shown Figure 1A partial enlarged view of the rotor assembly, wherein the mounting ribs are hidden; Figure 7A Shown from another perspective Figure 1 A partial enlarged view of the rotor assembly; Figure 7B The structure near the positioning step of the rotor assembly is shown; Figure 8 Shown Figure 1 a partial portion of a rotor assembly; Figure 9 Shown from another perspective Figure 1 a partial portion of a rotor assembly; Figure 10 A cross-sectional view of a ring motor and a first embodiment of a labyrinth seal structure are shown; Figure 11 A second embodiment of a labyrinth seal structure is shown; Figure 12 shows an overall view of the ring motor; Figure 13 Shown Figure 9 A magnified view of the circled portion of Figure 14 A partial view of a ring motor is shown, in particular showing the support.

[0080] As shown in the figures, the rotor assembly 1 of the present disclosure generally includes a rotor mounting portion 10 , a punching sheet mounted on the rotor mounting portion 10 , and a plurality of magnet tiles 40 held by the punching sheet.

[0081] The following first introduces the rotor mounting portion 10 and its related features.

[0082] The rotor mounting portion 10 is generally annular and can constitute the basic mounting structure of the rotor assembly. The punching sheets and the magnetic tiles 40 are directly or indirectly held by the rotor mounting portion 10.

[0083] The rotor mounting portion 10 includes a first mounting portion 12, a second mounting portion 13 and an intermediate mounting portion 14 connecting the first mounting portion 12 and the second mounting portion 13. Figure 7AAs shown, the rotor mounting portion 10 has a T-shaped cross-section. The outer surfaces of the first mounting portion 12 and the second mounting portion 13 are flush, forming the annular outer surface of the rotor mounting portion 10. The intermediate mounting portion 14 extends perpendicular to the first and second mounting portions 12, 13, resulting in a T-shaped cross-section of the rotor mounting portion 10. Preferably, as in the embodiment shown in the accompanying drawings, the first and second mounting portions 12, 13 are located on either side of the intermediate mounting portion 14, and the outer surfaces of the first, second, and intermediate mounting portions 12, 13, and 14 are flush, collectively forming the annular outer surface of the rotor mounting portion 10. Alternatively, in an embodiment not shown, the first and second mounting portions 12, 13 are directly joined together, with the intermediate mounting portion 14 extending perpendicular to the first and second mounting portions 12, 13. Furthermore, in a preferred embodiment, the first, second, and intermediate mounting portions 12, 13, and 14 can be manufactured separately and secured together using known methods. However, in an alternative embodiment, any two or even three of the first mounting portion 12 , the second mounting portion 13 , and the intermediate mounting portion 14 may be manufactured integrally.

[0084] In a preferred embodiment, the rotor mounting portion 10 is assembled from multiple separate sub-sections, each of which is arc-shaped. All sub-sections are assembled to form a complete annular rotor mounting portion 10. Each sub-section has its own first mounting portion 12, second mounting portion 13, and intermediate mounting portion 14. In other words, the first mounting portion 12, the second mounting portion 13, and the intermediate mounting portion 14 can each comprise multiple corresponding mounting portion sub-sections. In alternative embodiments, the rotor mounting portion 10 is a one-piece structure.

[0085] In a mill having a ring motor according to the present disclosure, the rotor assembly is mounted to the mill cylinder. More specifically, the mill cylinder is fixedly connected to the intermediate mounting portion 14 of the rotor mounting portion 10. For this purpose, for example, Figure 4 As shown, the intermediate mounting portion 14 of the present disclosure is provided with a plurality of axial through holes 141 spaced apart from each other in the circumferential direction. Fasteners such as bolts can pass through the axial through holes 141 to securely connect the mill cylinder to the intermediate mounting portion 14 of the rotor mounting portion 10 .

[0086] According to a preferred embodiment of the present disclosure, the first mounting portion 12 and the second mounting portion 13 of the rotor mounting portion 10 are configured to have different thicknesses. In the embodiment shown in the accompanying drawings, the mill barrel is connected to the first mounting portion 12 of the rotor mounting portion 10. To this end, the thickness of the first mounting portion 12 is preferably greater than that of the second mounting portion 13. By setting the thickness of the first mounting portion 12 greater than that of the second mounting portion 13, greater structural strength is provided on the side connected to the mill barrel, improving the reliability of the connection. At the same time, the smaller thickness of the second mounting portion 13 reduces the overall mass of the rotor, thereby reducing the weight of the entire motor.

[0087] Preferably Figure 4 、 8 As shown in Figures 9 and 10, the rotor mounting portion 10 further includes a first reinforcing rib 15 and a second reinforcing rib 16. The first reinforcing rib 15 is fixed to the first mounting portion 12 and the intermediate mounting portion 14. The second reinforcing rib 16 is fixed to the second mounting portion 13 and the intermediate mounting portion 14. The placement of these two reinforcing ribs in these locations further enhances the rigidity and bending strength of the rotor mounting portion 10, effectively resisting deformation that may occur under high speed or load conditions, thereby ensuring the durability of the rotor.

[0088] Preferably, the ribs on the thicker side of the rotor mounting portion 10 are shorter, while the ribs on the thinner side are taller. That is, the thickness of the first mounting portion 12 is greater than the thickness of the second mounting portion 13, and the height of the first reinforcing rib 15 is less than the height of the second reinforcing rib 16. This ensures the structural strength of the T-shaped rotor mounting portion 10 while reserving space for the mill barrel connection flange. This reduces the weight of the rotor mounting portion 10 and eases installation difficulty.

[0089] As mentioned above, the rotor mounting portion 10 preferably includes a plurality of sub-parts, each sub-part is arc-shaped, and all sub-parts are spliced together to form a complete annular rotor mounting portion 10. Preferably, adjacent sub-parts are mounted together via mounting flanges. Figure 9. Specifically, the mounting flanges include a first pair of mounting flanges 121 fixed to the first mounting portion 12 and the intermediate mounting portion 14, and a second pair of mounting flanges 124 fixed to the second mounting portion 13 and the intermediate mounting portion 14. Here, the first pair of mounting flanges 121 includes a pair of plate-like flange structures located on the first mounting portions 12 of adjacent subsections and abutting against each other and fixed together. The pair of plate-like flange structures are provided with flange mounting holes 123 aligned with each other, so that bolts or other fasteners can pass through the mounting through holes to secure the pair of mounting flanges together. Similarly, the second pair of mounting flanges 124 refers to a pair of plate-like flange structures located on the second mounting portions 13 of adjacent subsections and abutting against each other and fixed together. The pair of plate-like flange structures are provided with flange mounting holes 123 aligned with each other, so that bolts or other fasteners can pass through the mounting through holes to secure the pair of mounting flanges together.

[0090] Best as Figure 4 As shown, to facilitate the secure connection between the mounting flanges, preferably, a mounting clearance groove 122 perpendicular to the first pair of mounting flanges 121 is provided on the inner surface (i.e., the radially inward-facing surface) of the first mounting portion 12, near the first pair of mounting flanges 121. The provision of the mounting clearance groove 122 provides additional space for convenient secure connection between adjacent mounting flanges without substantially reducing the structural strength of the rotor mounting portion 10. Preferably, the number of the mounting clearance grooves 122 is the same as the number of flange mounting holes 123 in the first pair of mounting flanges 121, thereby providing space for the installation of each fastener intended to pass through the flange mounting hole 123. Preferably, the mounting clearance groove 122 is aligned with the flange mounting hole 123, extending, for example, perpendicularly to the mounting flange.

[0091] Next, we will introduce the punching sheets, magnetic tiles and their related structural features.

[0092] As mentioned above, the rotor assembly further includes a punching sheet mounted to the rotor mounting portion 10 and a plurality of magnetic tiles 40 held by the punching sheet.

[0093] The punching sheet is composed of a plurality of punching sheet units 30. When viewed from a cross section perpendicular to the axial direction, each punching sheet unit 30 is an arc segment, and all the punching sheet units 30 form a complete annular punching sheet.

[0094] Each punching unit 30 is preferably formed by stacking several individual punching sheets in the axial direction.

[0095] The outer surface of each punching unit 30 is provided with one or more magnetic tile mounting grooves 32. In the embodiment shown in the drawings, each punching unit 30 is provided with four magnetic tile mounting grooves 32. The present disclosure does not exclude other numbers of magnetic tile mounting grooves 32, such as one, two, three, five, etc.

[0096] The rotor assembly also includes a plurality of magnet tiles 40, also known as magnets. These tiles 40 are arranged in groups, referred to herein as tile groups. Each tile group is mounted in a tile mounting slot 32. Each tile group may include a plurality of tiles 40 stacked axially. The tile groups are spaced apart circumferentially.

[0097] Preferably, if Figure 3 As shown, the magnetic shoe mounting groove 32 is a dovetail groove, in which the magnetic shoe 40 is disposed. The shape of the dovetail groove can provide a retaining force to prevent the magnetic shoe 40 from leaving the punching unit 30 in a radially outward direction.

[0098] Preferably, if Figure 5 As shown in FIG13 , each sheet unit 30 has two fixing plates 33 located at the two axial ends of the sheet unit 30 for retaining the magnetic tile assembly. As shown in the figure, a bolt 34 can be passed through the rotor sheet unit 30 and the fixing plates 33, and a nut 35 is provided on the bolt 34. By tightening the nut 35, the fixing plate 33 is fixed to the end of the rotor sheet unit 30, thereby using the fixing plate 33 to fix the magnetic tile 40 in the magnetic tile mounting groove 32. The bolts 34 and nuts 35 can be replaced by other fasteners, and the present disclosure does not exclude other methods for fixing the two fixing plates 33.

[0099] In the present disclosure, the punching unit 30 is connected to the rotor mounting portion 10 via the mounting ribs 20. Figure 3 and Figure 6 As shown, the rotor mounting portion 10 is provided with a plurality of mounting portion strip grooves 11 extending axially and spaced apart from each other in the circumferential direction. At the same time, the inner surface of each punching unit 30 is provided with a punching strip groove 31. When the punching unit 30, the mounting rib 20 and the rotor mounting portion 10 are assembled together, the first rib portion 21 of each mounting rib 20 is accommodated in the mounting portion strip groove 11, and the second rib portion 22 is accommodated in the punching strip groove 31. The mounting portion strip groove 11 and the punching strip groove 31 both have a limiting portion that limits the radial movement of the mounting rib 20, so that the mounting rib 20 can prevent the punching unit 30 from leaving the rotor mounting portion 10 in the radial outward direction. By providing the mounting rib 20, the pre-assembly of the punching unit 30 and the rotor mounting portion 10 can be achieved in a simple manner.

[0100] In an embodiment not shown, the mounting rib 20 and the punching unit 30 may not be provided with the second rib portion and the punching strip groove 31 , but may be fixed relative to each other by other known means.

[0101] Preferably, in addition to the first rib portion 21 and the second rib portion 22, the mounting rib 20 further includes an intermediate rib portion 23 connecting the first rib portion 21 and the second rib portion 22. The width of the first rib portion 21 and the width of the second rib portion 22 are both greater than the width of the intermediate rib portion 23, so that the mounting rib 20 roughly forms an I-shape. For example, in the embodiment shown in the accompanying drawings, the width of the first rib portion 21 can be the same as the width of the second rib portion 22, and both are greater than the width of the intermediate rib portion 23. In this disclosure, the length direction of the rib portion is the direction of its longest dimension, which is parallel to the axial direction after installation. The height direction of the rib portion is the extension direction from the first rib portion to the second rib portion, which is a radial direction after installation. The width direction of the rib portion is a direction perpendicular to its height direction and length direction, and the width of the rib portion is the dimension measured along its width direction.

[0102] In the preferred embodiment shown in the drawings, each punching unit 30 is mounted to the rotor mounting portion 10 via two mounting ribs 20, which allows for efficient mounting via a simple structure. In alternative embodiments, each punching unit 30 may utilize other numbers of mounting ribs 20.

[0103] According to the solution of the present disclosure, it is preferred that Figure 13 As shown, the rotor assembly further includes a plurality of fasteners 36 that securely connect the punching unit 30, the mounting ribs 20, and the rotor mounting portion 10. The fasteners 36 extend generally in the radial direction. Figure 4 As shown, the punching unit 30 is provided with a plurality of mounting holes 37 to allow fasteners 36 to pass through. By simultaneously passing fasteners through the punching unit 30, the mounting rib 20, and the rotor mounting portion 10, effective fastening of all three can be achieved in a simple manner with fewer parts. Alternatively, the fasteners can be passed only through the mounting rib 20 and the rotor mounting portion 10.

[0104] Preferably, the mounting ribs 20 are located between adjacent magnet tile groups. For example, in the embodiment shown in the accompanying drawings, each lamination unit 30 is provided with four magnet tile mounting slots 32 to hold four magnet tile groups, and each lamination unit 30 is mounted to the rotor mounting portion 10 via two mounting ribs 20. Both mounting ribs 20 are located between two adjacent magnet tile groups. In this way, the fasteners 36 do not pass through the magnet tile 40, but directly secure the lamination unit 30, the mounting ribs 20, and the rotor mounting portion 10 together.

[0105] Adjacent punching units 30 are preferably engaged with each other by mating protrusions and recesses, which may have complementary shapes to facilitate consistent positioning of the various punching units 30. Figure 6 As indicated by the arrow A in the figure, the concave portion can be in the shape of a dovetail groove and the convex portion has a shape complementary thereto. In other embodiments not shown, the convex portion and the concave portion can have other shapes, such as rectangular, polygonal, irregular, etc.

[0106] Preferably, if Figure 7B As shown, the rotor mounting portion 10 is provided with a positioning step 101 abutting against one of the fixing plates 33 to prevent the fixing plate 33 from moving away from the punching unit 30 in the axial direction.

[0107] As described in the background technology section, the rotor of a ring motor is large, and the magnetic force of the magnets is extremely strong. During installation, the attraction between the magnets and the stator is also extremely strong, making installation very difficult and potentially posing a safety hazard. To address this issue, the present disclosure provides a method in which the punching unit 30, on which the magnetic tiles 40 are mounted, slides to its mounting position on the rotor mounting portion 10 via the sliding movement of the mounting ribs 20, enabling convenient and efficient sliding assembly and overcoming this technical problem. The following focuses on the structural features and assembly methods related to sliding assembly.

[0108] Specifically, the present disclosure utilizes a plurality of mounting ribs 20 as one of the mounting members for mounting the sheet units 30 on the rotor mounting portion 10, such that the mounting ribs 20 are fixedly connected to the sheet units 30. Simultaneously, the relevant structure is configured such that, during assembly of the rotor assembly, the plurality of sheet units 30 can be moved to their mounting positions on the rotor mounting portion 10 by means of the sliding of the mounting ribs 20 in the strip-shaped grooves 11 of the mounting portion. A specific implementation method for achieving the fixed connection between the mounting ribs 20 and the sheet units 30 may be that the second rib portion 22 is accommodated in and fixed relative to the strip-shaped grooves 31 of the sheet. However, in embodiments not shown, the mounting ribs 20 and the sheet units 30 may be fixed in other ways.

[0109] In a preferred embodiment of the present disclosure, the first rib portion 21 of the mounting rib 20 after final assembly is accommodated in the mounting portion strip groove 11 , and the second rib portion 22 is accommodated in the punching sheet strip groove 31 .

[0110] Preferably, the present disclosure enables the first groove end portion 111 of the mounting portion strip groove 11 to be open in the axial direction, such as Figure 6 As shown, the mounting rib 20 is allowed to be inserted into the mounting portion strip groove 11 along the axial direction. Thus, the mounting rib 20 can be pre-fixed to the rotor mounting portion 10 by being inserted into the mounting portion strip groove 11 from the first groove end 111.

[0111] As shown in FIG7 , the second groove end 112 of the mounting portion strip groove 11 is preferably not open in the axial direction. The second groove end 112, which is closed in the axial direction, can be used to provide a stop for the mounting rib 20. However, the present disclosure does not exclude the possibility that the second groove end 112 of the mounting portion strip groove 11 can also be open in the axial direction.

[0112] As mentioned above, the rotor mounting portion 10 may be provided with a positioning step 101 that abuts against one of the fixing pieces 33. Preferably, the structure is designed so that there is a gap g between the fixing piece 33 abutting against the positioning step 101 and the rotor mounting portion 10. The positioning step 101 and the gap g are Figure 7B By setting the gap, it is possible to avoid friction between the fixing plate of the sheet unit 30 and the rotor mounting portion 10 when the rotor sheet unit 30 is inserted, thereby preventing the rotor mounting portion 10 or the rotor sheet unit 30 from being damaged due to friction.

[0113] The assembly steps of the ring motor involved in the present disclosure may mainly include: the first step, assembling the rotor assembly and the stator assembly to which the punching unit 30 has not yet been installed, so that the stator assembly surrounds the rotor assembly. The second step, fixing the mounting rib 20 to the punching unit 30. This step may include the sub-step of fixing the magnetic tile 40 to the punching unit 30, which step can be performed before or after fixing the mounting rib 20 to the punching unit 30. The third step, inserting the mounting rib 20 fixed to the punching unit 30 into the mounting portion strip groove 11 of the rotor mounting portion 10, at which time the punching unit 30 retains one or more magnetic tile groups, and allowing the mounting rib 20 to slide in the mounting portion strip groove 11 until the punching unit 30 reaches its installation position on the rotor mounting portion 10. The installation position may be the position where the fixing plate 33 abuts the positioning step 101. In the fourth step, after the punching unit 30 reaches its installation position on the rotor mounting portion 10 , the punching unit 30 , the mounting ribs 20 and the rotor mounting portion 10 are fixedly connected by a plurality of fasteners 36 .

[0114] Preferably, the axial dimension of the mounting rib 20 is greater than the axial dimension of the punching unit 30, and one end of the mounting rib 20 extends out of the punching unit 30. In this way, the end of the mounting rib 20 extending out of the punching unit 30 can serve as the insertion end. In this way, when the magnet is first inserted, it is still relatively far away from the stator assembly. Although the magnetic attraction force exerted on the punching unit 30 increases as the punching unit 30 approaches the stator assembly in the axial direction, it will not be attracted toward the stator assembly because it has already been engaged with the mounting rib 20. In this way, by having one end of the mounting rib 20 extend out of the punching unit 30, the punching unit 30 and the mounting rib 20 can be engaged before the attraction between the magnet and the stator assembly increases, and then the punching unit 30 can be pushed along the mounting rib 20, thereby avoiding installation difficulties or even safety hazards caused by excessive attraction between the magnet and the stator.

[0115] The overall structure of the ring motor proposed in the present disclosure will be introduced below. According to the preferred embodiment of the present disclosure, the ring motor generally 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 100, and the housing 1 defines an inner cavity 104 inside it. The inner cavity 104 may be an annular channel. Preferably, the housing 1 may include at least two sub-housings spliced together in the circumferential direction. In a preferred embodiment, 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 100 on the side opposite to the inner cavity 104. The rotor assembly 3 is mounted on the radial inner side of the stator assembly 2.

[0116] 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, thereby providing structural support with greater strength and stability 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 a 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 to the housing through the radial outer wall and then dissipated to the external environment, further improving the heat dissipation of the stator assembly. Therefore, the present ring-shaped motor is particularly suitable for mechanical equipment such as grinding mills that experience heavy workloads and harsh operating conditions.

[0117] The housing 1 may include a cooling channel 4 disposed on the radial inner wall 100 within the inner cavity 104, extending circumferentially and radially opposite the stator assembly 2. Any suitable coolant, such as water or oil, may flow through the cooling channel 4. Because the cooling channel 4 is located adjacent to and directly opposite the stator assembly 2, heat from the stator assembly 2 is directly transferred to the coolant within the cooling channel 4 via the radial inner wall 100, thereby achieving optimal cooling of the stator assembly 2. Furthermore, the cooling channel 4 may be formed in any suitable manner. According to a simple preferred embodiment, the cooling channel may be formed by welding C-shaped steel to the radial inner wall 100.

[0118] The housing 1 further includes a radial outer wall 103 and two side walls 102 connected to the radial outer wall 103 and the radial inner wall 100 . The radial outer wall 103 , the radial inner wall 100 and the two side walls 102 define the inner cavity 104 .

[0119] The ring-shaped motor may include a shield disposed on the sides of the stator assembly 2 and the rotor assembly 3 to cover the stator assembly 2 and the rotor assembly 3 of the ring-shaped motor. The shield may include a first shield 71 disposed on one side of the stator assembly 2 and the rotor assembly 3 and a second shield 72 disposed on the other side of the stator assembly 2 and the rotor assembly 3. The first shield 71 and the second shield 72 may both be fixed to the housing 1, in particular, the sidewall 102 of the housing 1. It should be understood that when the housing is composed of multiple sub-housing segments, the first shield 71 and the second shield 72 may also be provided in a segmented form for each sub-housing; alternatively, a single annular shield may be provided for all sub-housings.

[0120] Preferably, it further comprises at least one support member 73 supported between the shield and the housing 1. Preferably, there are several support members 73 between the first shield 71 and the housing 1 and between the second shield 72 and the housing 1. Figure 14 As shown, the support member 73 may include a plate-shaped portion mounted to the housing 1, a plate-shaped portion mounted to the shield, and an intermediate extension connecting the two plate-shaped portions. The support member can prevent the first shield 71 and the second shield 72 from excessively deforming toward the housing, stator assembly, and rotor assembly due to accidental collisions, etc.

[0121] Preferably, the annular motor further comprises a fan 9 for cooling the annular motor, and the fan 9 can form a cooling airflow inside the annular motor, in particular, blow cooling air into the inner cavity 104. Figure 12 As shown, the fan 9 may be arranged on the radial outer wall 103 of the housing 1 .

[0122] In the preferred embodiment shown in the drawings, the radial inner wall 100 includes exhaust holes 105, preferably, exhaust holes 105 are provided on both axial sides of the radial inner wall 100, such as Figure 10By providing the exhaust holes 105 , the air blown into the inner cavity 104 from the external environment by the fan 9 is exhausted from the exhaust holes 105 , so that the inner cavity 104 always maintains a positive pressure, which not only facilitates the discharge of heat from the inner cavity 104 but also more effectively prevents pollutants from entering the inner cavity 104 .

[0123] In order to improve the sealing performance between the rotor and the stator while preventing impurities such as dust from entering between the stator and the rotor, thereby increasing the service life of the annular permanent magnet motor, the present invention designs a special labyrinth sealing structure that works in conjunction with a fan. The cooling airflow caused by the fan can leave the annular motor from the inside of the annular motor through the labyrinth sealing structure.

[0124] The labyrinth seal structure of the present disclosure is formed by the cooperation of corresponding structures on the rotor assembly and the shroud. The structure forming the labyrinth seal on the rotor assembly (referred to as the sealing structure portion) is specifically located on the rotor mounting portion 10 of the rotor assembly.

[0125] The rotor mounting portion 10 has two axial ends: a first axial end 17 and a second axial end 18. In this disclosure, the labyrinth seal structure between the first shroud 71 and the rotor assembly 3 (particularly the first axial end 17 of the rotor mounting portion 10) is referred to as a first labyrinth seal structure, and the labyrinth seal structure between the second shroud 72 and the rotor assembly 3 (particularly the second axial end 18 of the rotor mounting portion 10) is referred to as a second labyrinth seal structure. Figure 10 and Figure 11 As shown, the first labyrinth seal structure and the second labyrinth seal structure are identical.

[0126] The sealing structure forming the labyrinth seal on the rotor assembly may specifically be one or more annular grooves. Correspondingly, the first shield 71 and / or the second shield 72 may be provided with one or more annular protrusions that at least partially extend into the annular grooves to form the labyrinth seal.

[0127] in, Figure 10 A first embodiment of a labyrinth seal structure is shown. Figure 11 A second embodiment of a labyrinth seal structure is shown. The difference between the two lies in, but is not limited to, the orientation and number of the annular grooves. A detailed description of the two embodiments will be provided below.

[0128] In a first embodiment of the labyrinth seal structure, the sealing structure portion on the rotor mounting portion is one or more annular grooves. Figure 10Specifically, there are two annular grooves, separated by an annular protrusion, and open axially. Correspondingly, the first shield 71 has one or more annular protrusions, specifically two annular protrusions shown in the figure, extending into the one or more grooves. These two annular protrusions also extend axially and at least partially enter corresponding annular grooves on the rotor mounting portion. This design, with a simple structure, effectively improves the sealing performance between the rotor and stator while preventing dust and other impurities from entering the space between the rotor and stator.

[0129] In a second embodiment of the labyrinth seal structure, the sealing structure portion on the rotor mounting portion is one or more annular grooves. Figure 11 Specifically, it is an annular groove 74. The annular groove is open in the radial direction. Correspondingly, the first shield 71 has one or more annular protrusions extending into the one or more grooves, and the end of the first shield 71 extends into the annular groove to form a labyrinth seal. In an embodiment not shown, the sealing structure on the rotor mounting portion is two or more radially open annular grooves, and the end of the first shield 71 extends into one of the annular grooves. In addition, the first shield 71 also has a corresponding number of protrusions extending from its body to cooperate with other annular grooves to form a labyrinth seal. The labyrinth seal structure design of this second embodiment has a simple structure, and the edge of the first shield itself can be used as part of the labyrinth seal structure, saving processing time.

[0130] The coordinated use of the blower and the labyrinth sealing structure in the present disclosure not only provides a good cooling effect, but also ensures good sealing and dustproof performance.

[0131] The exemplary implementation schemes proposed in the present disclosure are described in detail above with reference to preferred embodiments. However, it will be understood by those skilled in the art that, without departing from the concept of the present disclosure, various modifications and variations can be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present disclosure can be combined in various ways without exceeding the scope of protection of the present disclosure.

Claims

1. A ring motor, characterized in that: include: stator assembly (2); a rotor assembly (3) surrounded by the stator assembly (2); a first shield (71) located on one side of the stator assembly (2) and the rotor assembly (3); A first labyrinth seal structure is formed between the first shield (71) and the rotor assembly (3).

2. The ring motor according to claim 1, wherein: The rotor assembly (3) comprises a rotor mounting portion (10) for holding a punching sheet, wherein a first axial end portion (17) of the rotor mounting portion (10) has a sealing structure portion for forming a first labyrinth sealing structure.

3. The ring motor according to claim 2, wherein: The sealing structure is one or more annular grooves open in the axial direction, and the first shield (71) has one or more annular protrusions extending into the one or more grooves.

4. The ring motor according to claim 3, wherein: The sealing structure is two annular grooves that are open in the axial direction, and the first shield (71) has two annular protrusions that extend into the two annular grooves.

5. The ring motor according to claim 2, wherein: The sealing structure is an annular groove that is open in the radial direction, and the end of the first shield (71) extends into the annular groove.

6. The ring motor according to claim 1, wherein: The ring-shaped motor further includes a fan configured to form a cooling airflow inside the ring-shaped motor, wherein the cooling airflow can leave the ring-shaped motor via the first labyrinth seal structure.

7. The ring motor according to claim 6, characterized in that The ring motor further comprises a housing (1) surrounding the stator assembly (2), and the first shield (71) is fixed to the housing (1).

8. The ring motor according to claim 7, characterized in that It also includes at least one support member (73) supported between the first shield (71) and the housing (1).

9. The ring motor according to claim 6, wherein: The ring-shaped motor further comprises a second shield (72) located on the other side of the stator assembly (2) and the rotor assembly (3), wherein a second labyrinth seal structure is formed between the second shield and the rotor assembly (3), and the second labyrinth seal structure is the same as the first labyrinth seal structure.

10. A grinding mill, characterized in that: The invention comprises a ring motor according to any one of claims 1 to 9.

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