Rotor assembly and motor having it

Abstract

This invention provides a rotor assembly and a motor having the same. The rotor core of the rotor assembly is formed by circumferentially splicing multiple core blocks. Each core block has a channel, and each connector is inserted into the channel, having a first part and a second part located outside the two ends of each channel. The rotor support consists of an outer ring, a magnetic shielding ring, and the rotor core, nested sequentially from the inside out. The magnetic shielding ring has a third and a fourth part located outside the two ends of the rotor core, and the outer ring has a fifth and a sixth part located outside the two ends of the rotor core. First fasteners connect the first part to the third and fifth parts, and second fasteners connect the second part to the fourth and sixth parts. According to this invention, the core blocks can be fixed to form the rotor core without drilling threaded holes in them, thus simplifying the rotor manufacturing process and improving production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to a rotor assembly and a motor having the same. Background Technology

[0002] Currently, the rotor structure of a typical tangential permanent magnet direct drive motor mainly includes a rotor support, a magnetic shielding ring, and a rotor core. The rotor core of this structure is usually formed by splicing multiple core blocks circumferentially. To fix these core blocks, threaded holes are typically drilled at corresponding positions on each core block, magnetic shielding ring, and rotor support. Multiple bolts are then used to connect the three parts together, thereby securing the core blocks and stabilizing the rotor structure. However, this process is relatively complex and has low production efficiency. Utility Model Content

[0003] Therefore, this utility model provides a rotor assembly that can solve the technical problems of complex manufacturing processes and low production efficiency of existing permanent magnet direct drive motor rotor structures.

[0004] To address the aforementioned problems, this utility model provides a rotor assembly, including a rotor core, a magnetic shielding ring, a rotor support, multiple connectors, multiple first fasteners, and multiple second fasteners. The rotor core comprises multiple core blocks, which are circumferentially joined to form the rotor core. Each core block has a channel constructed within it, and each channel penetrates the core block along the axial direction of the rotor core. Each connector is inserted into each channel, and each connector has a first portion and a second portion located outside the two ends of each channel. The rotor support includes an outer ring, and the outer ring, magnetic shielding ring, and rotor core are nested sequentially from the inside out. The magnetic shielding ring has a third and a fourth portion located outside the two ends of the rotor core, and the outer ring has a fifth and a sixth portion located outside the two ends of the rotor core. Each first fastener connects the first portion to the third and fifth portions, and each second fastener connects the second portion to the fourth and sixth portions.

[0005] In some embodiments, a first retaining ring is provided at the first end of the rotor core, the first retaining ring is fitted around the third part, and each first fastener connects the first part to the first retaining ring, the third part, and the fifth part respectively, and the first retaining ring abuts against each core block from the first end of the rotor core.

[0006] In some embodiments, each of the first portions is provided with a first threaded hole, and a plurality of first positioning structures are formed on the first retaining ring body. The first positioning structures are distributed circumferentially around the first retaining ring body. A plurality of second threaded holes are formed on the first retaining ring body. Each second threaded hole is located in the region of each of the first positioning structures. A first positioning fit structure is formed on the third portion. The first positioning fit structure is distributed circumferentially around the third portion. A plurality of third threaded holes are formed on the third portion. Each third threaded hole is located in the region of each of the first positioning fit structures. A plurality of fourth threaded holes are formed on the fifth portion. The fourth threaded holes are distributed circumferentially around the fifth portion. Each first positioning structure is positioned and fitted with each of the first positioning fit structures. Each first fastener is threadedly connected to each of the first threaded holes, each of the second threaded holes, each of the third threaded holes, and each of the fourth threaded holes.

[0007] In some embodiments, a second retaining ring is provided at the second end of the rotor core. The second retaining ring is fitted around the fourth part. Each of the second fasteners connects the second part to the second retaining ring, the fourth part, and the sixth part, respectively. The second retaining ring abuts against each core block from the second end of the rotor core.

[0008] In some embodiments, each of the second portions is provided with a fifth threaded hole, the second retaining ring body is provided with a plurality of second positioning structures, each of the second positioning structures being distributed circumferentially around the second retaining ring body, the second retaining ring body is provided with a plurality of sixth threaded holes, each of the sixth threaded holes being located in the region of each of the second positioning structures, the fourth portion is provided with a second positioning mating structure, each of the second positioning mating structures being distributed circumferentially around the fourth portion, the fourth portion is provided with a plurality of seventh threaded holes, each of the seventh threaded holes being located in the region of each of the second positioning mating structures, the sixth portion is provided with a plurality of eighth threaded holes, each of the eighth threaded holes being distributed circumferentially around the sixth portion, each of the second positioning structures being positioned and mated with each of the second positioning mating structures, and each of the second fasteners being threadedly connected in each of the fifth threaded holes, each of the sixth threaded holes, each of the seventh threaded holes, and each of the eighth threaded holes.

[0009] In some embodiments, each of the first fasteners is threaded with a first nut, and each of the first nuts is in close contact with the inner peripheral wall of the fifth part.

[0010] In some embodiments, each of the second fasteners is threaded with a second nut, and each of the second nuts is in close contact with the inner peripheral wall of the sixth part.

[0011] In some embodiments, each of the iron core blocks is engaged with the magnetic shielding ring.

[0012] In some embodiments, the magnetic shielding ring is engaged with the outer ring of the bracket.

[0013] This utility model also provides an electric motor, including the aforementioned rotor assembly.

[0014] The rotor assembly and the motor having the same provided by this utility model have the following beneficial effects:

[0015] By constructing channels extending axially along the rotor core within each core block, and inserting connectors into each channel, each connector having a first and a second portion located outside the two ends of the channel, the magnetic shielding ring has a third and a fourth portion located outside the two ends of the rotor core, and the outer ring of the support has a fifth and a sixth portion located outside the two ends of the rotor core, each first fastener connects the first, third, and fifth portions, and each second fastener connects the second, fourth, and sixth portions, thereby fixing the core blocks into a single unit to form the rotor core. Compared to existing technologies, this method eliminates the need for threaded holes in the core blocks to fix them into the rotor core, thus simplifying the rotor manufacturing process and improving production efficiency. Attached Figure Description

[0016] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the rotor assembly according to an embodiment of the present invention;

[0018] Figure 2 This is an exploded view of the rotor assembly according to an embodiment of the present invention;

[0019] Figure 3 This is an exploded view of the rotor assembly according to an embodiment of the present invention;

[0020] Figure 4 This is an exploded view of the rotor assembly of this utility model embodiment after removing the first retaining ring body, each of the first fasteners, the second retaining ring body, and each of the second fasteners.

[0021] Figure 5 This is a schematic diagram of the core block of the rotor core of the rotor assembly according to an embodiment of the present utility model.

[0022] Figure 6 This is a schematic diagram of the structure of the connecting member of the rotor assembly according to an embodiment of the present utility model;

[0023] Figure 7 This is a schematic diagram of the rotor support structure of the rotor assembly according to an embodiment of the present utility model;

[0024] Figure 8 This is a schematic diagram of the structure of the magnetic shielding ring of the rotor assembly in an embodiment of the present invention.

[0025] The reference numerals in the attached figures are as follows:

[0026] 1. Rotor core; 2. Magnetic shielding ring; 3. Rotor support; 31. Outer ring of support; 32. Inner ring of support; 33. Support connecting key; 4. Connector; 5. First fastener; 6. Second fastener; 7. Channel; 8. First retaining ring; 9. First positioning structure; 10. Second retaining ring; 11. Second positioning structure; 12. First nut; 13. Second nut; 14. Rotating shaft; 15. Permanent magnet; 16. First protrusion; 17. First groove; 18. Second protrusion; 19. Second groove; 20. Permanent magnet slot. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0028] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0029] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0030] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0031] See also Figures 1 to 8 As shown, according to an embodiment of the present invention, a rotor assembly is provided, including a rotor core 1, a magnetic shielding ring 2, a rotor support 3, multiple connectors 4, multiple first fasteners 5, and multiple second fasteners 6. The rotor core 1 includes multiple core blocks, which are spliced ​​together circumferentially to form the rotor core 1. Each core block has a channel 7 constructed therein, and each channel 7 passes through the core block along the axial direction of the rotor core 1. Each connector 4 is inserted into each channel 7, and each connector 4 has a portion located outside the two ends of each channel 7. The first part and the second part are the rotor support 3, which includes an outer ring body 31. The outer ring body 31, the magnetic shielding ring 2, and the rotor core 1 are nested from the inside to the outside. The magnetic shielding ring 2 has a third part and a fourth part outside the two ends of the rotor core 1. The outer ring body 31 has a fifth part and a sixth part outside the two ends of the rotor core 1. Each first fastener 5 connects the first part to the third part and the fifth part, and each second fastener 6 connects the second part to the fourth part and the sixth part.

[0032] In this technical solution, channels 7 extending axially along the rotor core 1 are constructed within each core block. Connectors 4 are inserted into each channel 7, and each connector 4 has a first part and a second part located outside the two ends of each channel 7. The magnetic shielding ring 2 has a third and a fourth part located outside the two ends of the rotor core 1, and the outer ring 31 of the support has a fifth and a sixth part located outside the two ends of the rotor core 1. First fasteners 5 connect the first part to the third and fifth parts, and second fasteners 6 connect the second part to the fourth and sixth parts, thereby fixing the core blocks into a single unit to form the rotor core 1. Compared to existing technologies, this method eliminates the need for threaded holes in the core blocks to fix them into the rotor core 1, thus simplifying the rotor manufacturing process and improving production efficiency.

[0033] It should be noted that the rotor support 3 also includes an inner ring body 32 and multiple support connecting keys 33. The first end of each support connecting key 33 is connected to the outer ring body 31 of the support, and the second end of each support connecting key 33 is connected to the inner ring body 32 of the support. The support connecting keys 33 are distributed in a spoke-like manner between the outer ring body 31 and the inner ring body 32 of the support. The inner ring body 32 of the support is fitted onto the rotating shaft 14.

[0034] See also Figures 1 to 3 As shown, a first retaining ring 8 is provided at the first end of the rotor core 1. The first retaining ring 8 is fitted around the third part. Each first fastener 5 connects the first part to the first retaining ring 8, the third part, and the fifth part respectively. The first retaining ring 8 abuts against each core block from the first end of the rotor core 1.

[0035] In this embodiment, the first retaining ring 8 provides a thicker layer, making the connection between each connecting piece 4 and the magnetic shielding ring 2 and rotor support 3 more secure with each first fastener 5. Furthermore, the first retaining ring 8 also enhances the structural strength of the rotor assembly. Moreover, after the first retaining ring 8 is locked by each first fastener 5, its contact with each core block from the first end of the rotor core 1 provides axial positioning for each core block.

[0036] See also Figures 1 to 3As shown, each first part is provided with a first threaded hole, and a plurality of first positioning structures 9 are formed on the first retaining ring body 8. The first positioning structures 9 are distributed at intervals along the circumference of the first retaining ring body 8. A plurality of second threaded holes are formed on the first retaining ring body 8. Each second threaded hole is located in the area where each first positioning structure 9 is located. A first positioning fit structure is formed on the third part. The first positioning fit structure is distributed at intervals along the circumference of the third part. A plurality of third threaded holes are formed on the third part. Each third threaded hole is located in the area where each first positioning fit structure is located. A plurality of fourth threaded holes are formed on the fifth part. The fourth threaded holes are distributed at intervals along the circumference of the fifth part. Each first positioning structure 9 is positioned and fitted with each first positioning fit structure. Each first fastener 5 is threadedly connected in each of the first threaded holes, each of the second threaded holes, each of the third threaded holes and each of the fourth threaded holes.

[0037] In this technical solution, by positioning each second threaded hole within the area of ​​each first positioning structure 9 and each third threaded hole within the area of ​​each first positioning and mating structure, accurate alignment of each second threaded hole with each third threaded hole can be achieved when the first retaining ring 8 is fitted onto the third part of the magnetic shielding ring 2 and each first positioning structure 9 is positioned and mated with each first positioning and mating structure. This makes the alignment and installation of the first retaining ring 8 and the magnetic shielding ring 2 faster and more convenient, thereby improving assembly efficiency.

[0038] See also Figures 1 to 3 As shown, a second retaining ring 10 is provided at the second end of the rotor core 1. The second retaining ring 10 is fitted around the fourth part. Each second fastener 6 connects the second part to the second retaining ring 10, the fourth part, and the sixth part respectively. The second retaining ring 10 abuts against each core block from the second end of the rotor core 1.

[0039] In this embodiment, the second retaining ring 10 provides shimmy support, making the connection between the connecting member 4 and the magnetic shielding ring 2 and rotor support 3 more secure with the second fasteners 6. The second retaining ring 10 also enhances the structural strength of the rotor assembly. Furthermore, after the second retaining ring 10 is locked by the second fasteners 6, it abuts against each core block from the second end of the rotor core 1, thus providing axial restraint to each core block. It is understood that when the first retaining ring 8 and the second retaining ring 10 are present simultaneously, they clamp each core block from both axial sides of the rotor core 1, thereby making the rotor core 1 formed by the splicing of the core blocks more securely fixed.

[0040] See also Figures 1 to 3As shown, each of the second parts is provided with a fifth threaded hole, and the second retaining ring 10 is provided with a plurality of second positioning structures 11, which are distributed at intervals along the circumference of the second retaining ring 10. The second retaining ring 10 is provided with a plurality of sixth threaded holes, which are located in the area of ​​each of the second positioning structures 11. The fourth part is provided with a second positioning fit structure, which are distributed at intervals along the circumference of the fourth part. The fourth part is provided with a plurality of seventh threaded holes, which are located in the area of ​​each of the second positioning fit structures. The sixth part is provided with a plurality of eighth threaded holes, which are distributed at intervals along the circumference of the sixth part. Each second positioning structure 11 is positioned and fitted with each of the second positioning fit structures. Each second fastener 6 is threadedly connected to each of the fifth threaded holes, the sixth threaded holes, the seventh threaded holes and the eighth threaded holes.

[0041] In this technical solution, by positioning each sixth threaded hole within the area of ​​each second positioning structure 11 and each seventh threaded hole within the area of ​​each second positioning and mating structure, accurate alignment of the sixth and seventh threaded holes can be achieved when the second retaining ring 10 is fitted onto the fourth part of the magnetic shielding ring 2 and each second positioning structure 11 is in positional engagement with each second positioning and mating structure. This makes the alignment and installation of the second retaining ring 10 and the magnetic shielding ring 2 faster and more convenient, thereby improving assembly efficiency.

[0042] See also Figures 1 to 3 As shown, each of the first fasteners 5 is threaded with a first nut 12, and each first nut 12 is tightly attached to the inner circumferential wall of the fifth part. This can prevent the first fasteners 5 from loosening, thereby ensuring the locking effect of each first fastener 5.

[0043] See also Figures 1 to 3 As shown, each of the second fasteners 6 is threaded with a second nut 13, and each second nut 13 is tightly attached to the inner circumferential wall of the sixth part. This can prevent the second fasteners 6 from loosening, thereby ensuring the locking effect of each second fastener 6.

[0044] See also Figure 4 , Figure 5 and Figure 8 As shown, each iron core block is engaged with the magnetic shielding ring 2.

[0045] In this embodiment, each iron core block is engaged with the magnetic shielding ring 2, thus forming a circumferential fixation between the iron core block and the magnetic shielding ring 2. Specifically, each iron core block may have a first protrusion 16 on the side facing the magnetic shielding ring 2, and multiple first grooves 17 may be formed on the outer peripheral wall of the magnetic shielding ring 2. The first grooves 17 are distributed circumferentially around the magnetic shielding ring 2, and each first protrusion 16 engages with each first groove 17 to achieve engagement between each iron core block and the magnetic shielding ring 2. It should be noted that permanent magnet slots 20 are constructed on both sides where the iron core blocks are spliced. After the iron core blocks are spliced ​​to form the rotor iron core 1, the two permanent magnet slots 20 between two adjacent iron core blocks form a complete permanent magnet slot. Each permanent magnet slot extends radially along the rotor iron core 1, and a permanent magnet 15 is inserted into each permanent magnet slot. It should also be noted that the first positioning structure 9 can be a protrusion formed on the inner peripheral wall of the first stop ring body 8, and the first positioning mating structure can be a first groove 17 formed on the outer peripheral wall of the magnetic shielding ring body 2; the second positioning structure 11 can be a protrusion formed on the inner peripheral wall of the second stop ring body 10, and the second positioning mating structure can be a first groove 17 formed on the outer peripheral wall of the magnetic shielding ring body 2.

[0046] See also Figure 4 , Figure 7 and Figure 8 As shown, the magnetic shielding ring 2 is engaged with the outer ring 31 of the bracket.

[0047] In this technical solution, the magnetic shielding ring 2 and the outer ring 31 of the support are engaged to form a circumferential fixation between the magnetic shielding ring 2 and the rotor support 3. Specifically, multiple second protrusions 18 are formed on the outer peripheral wall of the outer ring 31 of the support, and the second protrusions 18 are distributed at intervals along the circumference of the outer ring 31 of the support; multiple second grooves 19 are formed on the inner peripheral wall of the magnetic shielding ring 2, and the second grooves 19 are distributed at intervals along the circumference of the magnetic shielding ring 2. Each second protrusion 18 is engaged in the second groove 19 to achieve the engagement between the magnetic shielding ring 2 and the outer ring 31 of the support.

[0048] This utility model also provides an electric motor, including the aforementioned rotor assembly.

[0049] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0050] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above are only preferred embodiments of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A rotor assembly, characterized in that, The rotor core (1) includes a rotor core (1), a magnetic shielding ring (2), a rotor support (3), multiple connectors (4), multiple first fasteners (5), and multiple second fasteners (6). The rotor core (1) includes multiple core blocks, which are spliced ​​together circumferentially to form the rotor core (1). Each core block has a channel (7) constructed inside it. Each channel (7) passes through the core block along the axial direction of the rotor core (1). Each connector (4) is inserted into each channel (7), and each connector (4) has a first part and a second part located outside the two ends of each channel (7). The rotor support (3) includes an outer ring body (31), the outer ring body (31), the magnetic shielding ring body (2), and the rotor core (1) are nested from the inside out. The magnetic shielding ring body (2) has a third part and a fourth part outside the two ends of the rotor core (1). The outer ring body (31) has a fifth part and a sixth part outside the two ends of the rotor core (1). Each first fastener (5) connects each first part to the third part and the fifth part, and each second fastener (6) connects each second part to the fourth part and the sixth part.

2. The rotor assembly according to claim 1, characterized in that, The first end of the rotor core (1) is provided with a first retaining ring (8), which is fitted around the third part. Each first fastener (5) connects the first part to the first retaining ring (8), the third part, and the fifth part respectively. The first retaining ring (8) abuts against each core block from the first end of the rotor core (1).

3. The rotor assembly according to claim 2, characterized in that, Each of the first portions is provided with a first threaded hole. The first retaining ring body (8) is provided with a plurality of first positioning structures (9). Each of the first positioning structures (9) is distributed circumferentially around the first retaining ring body (8). The first retaining ring body (8) is provided with a plurality of second threaded holes. Each of the second threaded holes is located in the area of ​​each of the first positioning structures (9). The third portion is provided with a first positioning fit structure. Each of the first positioning fit structures is distributed circumferentially around the third portion. The third portion is provided with a plurality of third threaded holes. Each of the third threaded holes is located in the area of ​​each of the first positioning fit structures. The fifth portion is provided with a plurality of fourth threaded holes. Each of the fourth threaded holes is distributed circumferentially around the fifth portion. Each of the first positioning structures (9) is positioned and fitted with each of the first positioning fit structures. Each of the first fasteners (5) is threadedly connected to each of the first threaded holes, each of the second threaded holes, each of the third threaded holes and each of the fourth threaded holes.

4. The rotor assembly according to claim 1, characterized in that, The second end of the rotor core (1) is provided with a second retaining ring (10), which is fitted around the fourth part. Each of the second fasteners (6) connects the second part to the second retaining ring (10), the fourth part, and the sixth part respectively. The second retaining ring (10) abuts against each core block from the second end of the rotor core (1).

5. The rotor assembly according to claim 4, characterized in that, Each of the second portions is provided with a fifth threaded hole. The second retaining ring body (10) is provided with a plurality of second positioning structures (11). Each of the second positioning structures (11) is distributed circumferentially around the second retaining ring body (10). The second retaining ring body (10) is provided with a plurality of sixth threaded holes. Each of the sixth threaded holes is located in the area of ​​each of the second positioning structures (11). The fourth portion is provided with a second positioning fit structure. Each of the second positioning fit structures is distributed circumferentially around the fourth portion. The fourth portion is provided with a plurality of seventh threaded holes. Each of the seventh threaded holes is located in the area of ​​each of the second positioning fit structures. The sixth portion is provided with a plurality of eighth threaded holes. Each of the eighth threaded holes is distributed circumferentially around the sixth portion. Each of the second positioning structures (11) is positioned and fitted with each of the second positioning fit structures. Each of the second fasteners (6) is threadedly connected to each of the fifth threaded holes, each of the sixth threaded holes, each of the seventh threaded holes and each of the eighth threaded holes.

6. The rotor assembly according to claim 1, characterized in that, Each of the first fasteners (5) is threaded with a first nut (12), and each of the first nuts (12) is in close contact with the inner peripheral wall of the fifth part.

7. The rotor assembly according to claim 1, characterized in that, Each of the second fasteners (6) is threaded with a second nut (13), and each of the second nuts (13) is in close contact with the inner peripheral wall of the sixth part.

8. The rotor assembly according to claim 1, characterized in that, Each of the iron core blocks is engaged with the magnetic shielding ring (2).

9. The rotor assembly according to claim 1, characterized in that, The magnetic shielding ring (2) is engaged with the outer ring (31) of the bracket.

10. An electric motor, characterized in that, Includes the rotor assembly as described in any one of claims 1 to 9.

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