Rotor assembly and motor using same

Abstract

The invention discloses a rotor assembly and a motor using the rotor assembly, and the rotor assembly comprises a rotor injection molding body which is internally provided with a hollow cavity penetrating through the two axial ends of the rotor injection molding body; an output shaft is integrally formed at one axial side end of the rotor injection molding body through injection molding; a shaft hole used for being connected with a rotor supporting shaft in a matched mode is formed between the output shaft and the hollow cavity in a penetrating mode. A magnet ring injection-molded on the outer peripheral side of the rotor injection-molded body; the fixing plug is suitable for being inserted into the hollow cavity from the end, away from the output shaft, of the rotor injection molding body. A through hole which is coaxially communicated and matched with the shaft hole is formed in the fixing plug; wherein the hollow cavity and / or the fixed plug are at least provided with a section of suspension interval which is not completely contacted with the outer wall surface of the rotor support shaft.

Description

Technical Field

[0001] The present invention relates to the technical field of servo motors, and in particular to a rotor assembly and a motor using the rotor assembly. Background Art

[0002] The commonly used stepper motor has a housing and a rotor. The housing accommodates the rotor and supports the rotor to rotate through the rotor shaft. The housing includes a first housing (bottom of the housing) that supports one end of the rotor shaft and a second housing (cover plate) that is assembled axially to the first housing and supports the other end of the rotor shaft. One end of the rotor shaft is interference fit with the first housing, but the other end of the rotor shaft is clearance fit with the second housing, and the rotor is generally an integrated injection molding structure. The defects of this integrated injection molding structure rotor are: poor control of the center hole diameter consistency, because the rotor injection hole diameter is long, and the wall thickness is uneven, the material is less on the top and more on the bottom, which will lead to inconsistent shrinkage rates on the top and bottom, and the shape and size of the holes are different. Therefore, during the high-speed operation of the rotor on the rotor shaft, due to the centrifugal force of the rotor, the rotor shaft will be driven to swing (the second housing is clearance fit), the rotor hole shape is irregular after injection molding, and lacks lubrication, the rotor hole, the rotor shaft and the cover plate hole are prone to collision with each other, and the noise is large when rotating at high speed.

[0003] Announcement No. CN203368170U discloses a split rotor, which includes a split gear and a permanent magnet rotor. The split gear includes a gear part and a cylindrical support part, the gear part is arranged on the upper surface of the support part, the gear part and the support part are coaxial, and a circular protrusion is arranged on the lower surface of the support part, and at least three grooves are arranged on the circular protrusion, and the grooves are evenly distributed on the circular protrusion. A gear center hole is arranged at the center of the split gear; the permanent magnet rotor is annular, and a positioning platform is arranged inside the permanent magnet rotor, and a positioning protrusion is arranged on the positioning platform, the number of positioning protrusions is equal to the number of grooves, and the positioning protrusion and the groove are clamped; a rotor center hole is arranged at the center of the permanent magnet rotor. Although the split rotor under this structure adopts a split structure, which can make the rotor hole size consistency high during injection molding, the contact length between the overall structure and the rotor shaft remains unchanged, and the consistency of the rotor hole size is limited when the two parts are injected separately, so the noise reduction ability of the rotor is also limited when the high-speed operation is carried out.

[0004] In addition, the rotor assembly is installed in the motor through the rotor shaft. During assembly, the two ends of the rotor shaft are connected to the motor casing and cover plate by clip-on connection. The rotor shaft has poor stability, and the cover plate is easily displaced when riveted after being connected to the casing, causing the rotor shaft to tilt, which will cause loud noise when the motor runs at high speed. Summary of the invention

[0005] The first object of the present invention is to provide a rotor assembly to solve the technical problem of reducing the operating noise of the rotor assembly.

[0006] A second object of the present invention is to provide a motor to solve the technical problem of reducing the operating noise of the rotor assembly of the motor.

[0007] The rotor assembly of the present invention is achieved as follows:

[0008] A rotor assembly, comprising:

[0009] The rotor injection molding body has a hollow cavity formed inside thereof which passes through both axial ends thereof; an output shaft is integrally injection-molded at one axial side end of the rotor injection molding body; an axial hole for matching the rotor support shaft is formed between the output shaft and the hollow cavity;

[0010] A magnetic ring is injection molded on the outer peripheral side of the rotor injection molded body;

[0011] A fixing plug is adapted to be inserted into the hollow cavity from the end of the rotor injection molding away from the output shaft; and a through hole is formed in the fixing plug and is coaxially connected with the shaft hole; wherein

[0012] At least one suspended section which is not in complete contact with the outer wall surface of the rotor support shaft is formed in the hollow cavity and / or the fixing plug.

[0013] In an optional embodiment of the present invention, the suspended space is suitable for being filled with lubricant to wrap the outer wall surface of the rotor support shaft.

[0014] In an optional embodiment of the present invention, the fixing plug is interference fit with the hollow cavity.

[0015] In an optional embodiment of the present invention, the depth to which the fixing plug is inserted into the hollow cavity is less than the depth of the hollow cavity; and

[0016] The suspended area is formed between the hollow cavity and the fixing plug.

[0017] In an optional embodiment of the present invention, the fixing plug is inserted into the hollow cavity to a depth equal to the depth of the hollow cavity, so that the fixing plug fills the hollow cavity in the axial direction; and

[0018] The suspended area is formed in the fixing plug.

[0019] In an optional embodiment of the present invention, the through hole is a circular hole for clearance fit with the rotor support shaft.

[0020] In an optional embodiment of the present invention, the through hole includes a regular polygonal hole and a circular hole that are connected to each other, and the circular hole is located at the side end of the regular polygonal hole facing away from the output shaft of the rotor injection molding body; wherein

[0021] The circular hole is suitable for clearance fit with the rotating shaft support shaft; and

[0022] The inscribed circle of the regular polygonal hole is coaxial with the circular hole, and the inner diameter of the inscribed circle of the regular polygonal hole is not less than the inner diameter of the circular hole.

[0023] In an optional embodiment of the present invention, the shaft hole is a circular hole for clearance fit with the rotor support shaft; or

[0024] The shaft hole is a regular polygonal hole, and the inscribed circle of the regular polygonal hole is in clearance fit with the rotor support shaft.

[0025] In an optional embodiment of the present invention, the edges of the two axial ends of the magnetic ring are respectively formed with raised annular ribs, and an L-shaped step surface is formed between each of the annular ribs and the axial end of the magnetic ring; and

[0026] At least one recessed groove is formed on the axial end of each magnetic ring.

[0027] The motor of the present invention is realized as follows:

[0028] A motor comprises: the rotor assembly, a rotor support shaft matched with the rotor assembly, and a casing arranged outside the rotor assembly.

[0029] By adopting the above technical scheme, the present invention has the following beneficial effects: in the rotor assembly of the present invention and the motor using the rotor assembly, the split assembly structure of the rotor injection molding and the fixing plug enables at least a suspended section that is not completely in contact with the outer wall of the rotor support shaft to be formed in the hollow cavity and / or the fixing plug. Under the design of this suspended section, the contact length between the rotor injection molding and the rotor support shaft is reduced, thereby reducing the noise generated by the friction between the rotor assembly and the rotor support shaft when running at high speed.

[0030] Furthermore, by filling lubricant in the suspended interval to wrap the outer wall surface of the rotor support shaft, the lubrication fit between the rotor support shaft and the rotor injection molding can be further ensured, thereby further optimizing the noise reduction effect.

[0031] In addition, for the rotor injection molded body, a hollow cavity is directly formed during the injection molding process, which can reduce the injection molding cost of the rotor injection molded body on the one hand, and directly shorten the contact area between the rotor injection molded body and the rotor support shaft on the other hand, thereby reducing the difficulty of injection molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of the exploded structure of the rotor assembly of the present invention;

[0033] Figure 2 It is a schematic diagram of the matching structure of the rotor injection molded body and the magnetic ring of the rotor assembly of the present invention;

[0034] Figure 3is a schematic diagram of a fixing plug of a rotor assembly of the present invention in an optional implementation;

[0035] Figure 4 is a schematic diagram of a hollow cavity of a rotor assembly of the present invention in an optional implementation;

[0036] Figure 5 It is a schematic diagram of the matching structure of the hollow cavity and the fixing plug of the rotor assembly of the present invention in an optional implementation;

[0037] Figure 6 It is a structural schematic diagram of a magnetic ring of a rotor assembly of the present invention;

[0038] Figure 7 is a schematic diagram of the matching structure of the hollow cavity and the fixing plug of the rotor assembly of the present invention in another optional implementation;

[0039] Figure 8 It is a schematic diagram of the matching structure between the rotor support shaft and the regular polygonal hole of the rotor assembly of the present invention in an optional implementation;

[0040] Fig. 9 is a schematic cross-sectional structural diagram of the motor of the present invention;

[0041] Fig.10 It is a schematic structural diagram of the rotor support shaft of the motor of the present invention;

[0042] Fig.11 It is a structural schematic diagram of a cover plate of a motor of the present invention;

[0043] Fig.12 It is a schematic structural diagram of the slot of the housing of the motor of the present invention;

[0044] Fig.13 It is a schematic structural diagram of the ribs of the cover plate of the motor of the present invention.

[0045] In the figure: rotor injection molding 1, hollow cavity 11, step hole 12, output shaft 2, shaft hole 21, fixing plug 3, through hole 31, suspended section K, magnetic ring 5, annular rib 51, step surface 52, sink groove 53, regular polygonal hole 6, storage space 61, circular hole 62, shell 71, cover plate 72, rotor support shaft 8, chamfer 81. DETAILED DESCRIPTION

[0046] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0047] Embodiment 1:

[0048] See also Figures 1 to 6As shown, this embodiment provides a rotor assembly, including: an injection-molded rotor injection body 1 and a fixing plug 3 for matching with the rotor injection body 1 .

[0049] Next, let’s talk about the rotor injection molding 1:

[0050] An output shaft 2 is integrally molded at one axial side end of the rotor injection molding 1, and the output shaft 2 can be integrally molded or additionally equipped with a gear to facilitate transmission of the output power to, for example but not limited to, a gear transmission assembly. This embodiment does not make an absolute limitation to this.

[0051] Considering that the rotor injection molding body 1 needs to form a rotational fit with the rotor support shaft 8 during operation, an axial hole 21 for matching the rotor support shaft 8 is formed in the rotor injection molding body 1 and the output shaft 2. The axial hole 21 in this embodiment is different from the axial hole 21 in the rotor injection molding body 1 in the conventional technology in that:

[0052] The rotor injection molding body 1 is not a complete solid body structure, but a hollow cavity 11 is formed by injection molding inside the rotor injection molding body 1, and this hollow cavity 11 extends to the shaft side end of the rotor injection molding body 1 away from the output shaft 2, and taking the hollow cavity 11 with a circular cross section as an example, the inner diameter of the hollow cavity 11 in one implementation is much larger than the outer diameter of the rotor support shaft 8, so that when the rotor support shaft 8 is matched with the shaft hole 21, the hollow cavity 11 is not in contact with the outer wall surface of the rotor support shaft 8. Of course, here it is also possible that a part of the hollow cavity 11 is completely out of contact with the outer wall surface of the rotor support shaft 8 to facilitate the installation of the fixing plug 3, while the other part is in an incomplete contact with the outer wall surface of the rotor support shaft 8.

[0053] Based on the above structure, it should be noted that, in an optional implementation, a transition chamfer M is used to connect the hollow cavity 11 and the axial hole 21 of the output shaft 2. Such a design can prevent stress concentration and avoid the mold core from breaking due to injection pressure. The transition chamfer connection makes it smoother for the rotor support shaft 8 to be installed into the hollow cavity 11.

[0054] Next, the fixing plug 3 is used to be inserted into the hollow cavity 11 from the end of the rotor injection molding 1 away from the output shaft 2; and a through hole 31 is formed in the fixing plug 3 to be coaxially connected with the shaft hole 21. In order to improve the firmness of the fixing plug 3 and the hollow cavity 11, the fixing plug 3 in this embodiment is interference-fitted with the hollow cavity 11. Here, in order to facilitate the fixing plug 3 and the hollow cavity 11 to form a firm interference fit structure, the inner wall of the hollow cavity 11 is a smooth wall.

[0055] Furthermore, in conjunction with the attached drawings, an optional situation is given as an example. A stepped hole 12 for receiving the fixing plug 3 is formed at one end of the hollow cavity 11 away from the output shaft 2 of the rotor injection molding body 1; still taking the stepped hole 12 and the hollow cavity 11 with a circular cross section as an example, the inner diameter of the stepped hole 12 is larger than the inner diameter of the hollow cavity 11, and the corresponding fixing plug 3 is roughly in the shape of an inverted T. This structure can not only meet the interference fit between the fixing plug 3 and the hollow cavity 11, but also limit the depth of the fixing plug 3 inserted into the hollow cavity 11. It should be noted that in the case where the stepped hole 12 is designed here, the fixing plug 3 and the hollow cavity 11 can be an interference fit, while the stepped hole 12 and the fixing plug 3 can be a clearance fit; it can also be an interference fit between the fixing plug 3 and the hollow cavity 11 and the stepped hole 12. Of course, the step hole 12 may not be involved here, and the corresponding fixing plug 3 does not need to be designed as an inverted T-shaped structure, but can be designed to have the same structure at both axial ends. In this way, there is no need to distinguish the installation angle when the fixing plug 3 is installed into the hollow cavity 11, and any end of the fixing plug 3 inserted into the hollow cavity 11 meets the assembly requirements of this embodiment.

[0056] On the basis of the above structure, for the matching structure formed after the matching of the rotor assembly in which the fixing plug 3 and the hollow cavity 11 are matched, at least a suspended section K that is not completely in contact with the outer wall of the rotor support shaft 8 is formed in the hollow cavity 11 and / or the fixing plug 3. There are three specific situations here. The first kind of suspended section K only exists in the hollow cavity 11; the second kind of suspended section K only exists in the fixing plug 3; the third kind of suspended section K is formed between the hollow cavity 11 and the fixing plug 3. For the suspended section K here, it can be completely out of contact with the outer wall of the rotor support shaft 8, or it can be partially in contact, that is, as long as there is no covering contact with the outer wall of the rotor support shaft 8, the use requirements of this embodiment are met. In the preferred case, the suspended section K is completely out of contact with the outer wall of the rotor support shaft 8. The attached figure of this embodiment is only an example of the case where the suspended section K is completely out of contact with the outer wall of the rotor support shaft 8.

[0057] Next, the above three situations are described in detail. First, the first type of suspended interval K only exists in the hollow cavity 11, and its formation process is as follows:

[0058] The depth of the fixing plug 3 inserted into the hollow cavity 11 is less than the depth of the hollow cavity 11, that is, from the axial dimension of the hollow cavity 11, the fixing plug 3 will not fill the axial space of the hollow cavity 11, but there is an axial non-matching area between the hollow cavity 11 and the fixing plug 3, and the non-matching area also forms a suspended interval K.

[0059] The second type of suspended interval K exists only in the fixing plug 3, and its formation process is as follows:

[0060] The depth of the fixing plug 3 inserted into the hollow cavity 11 is equal to the depth of the hollow cavity 11, so that the fixing plug 3 fills the hollow cavity 11 in the axial direction. In this case, the fixing plug 3 is formed with the above-mentioned suspended section K which is connected to the through hole 31, and the diameter of the suspended section K is much larger than the diameter of the through hole 31, so that when the rotor support shaft 8 is plugged and matched with the through hole 31, the suspended section K does not directly contact the outer wall of the rotor support shaft 8.

[0061] The second type forms a suspended area K between the hollow cavity 11 and the fixing plug 3, and the formation process is as follows:

[0062] The depth of the fixing plug 3 inserted into the hollow cavity 11 is less than the depth of the hollow cavity 11, that is, from the axial dimension of the hollow cavity 11, the fixing plug 3 will not fill the axial space of the hollow cavity 11, but there is an axial non-matching area between the hollow cavity 11 and the fixing plug 3, and the non-matching area also forms a suspended interval K.

[0063] Based on the above structure, furthermore, the fixing plug 3 is formed with the above-mentioned suspended interval K which is connected with the through hole 31, and the diameter of the suspended interval K is much larger than the diameter of the through hole 31; under such a structure, it means that a part of the suspended interval K is located in the hollow cavity 11, and the other part is located in the fixing plug 3.

[0064] The above three situations all meet the use requirements of this embodiment, and this embodiment does not make an absolute limitation on this. Under the design of this suspended interval K, the contact length between the rotor injection molded body 1 and the rotor support shaft 8 is reduced, and the suspended area K is filled with lubricating grease, and the two cooperate to reduce the noise generated by the friction between the rotor assembly and the rotor support shaft 8 when the rotor assembly is running at high speed.

[0065] On the basis of the above structure, further speaking, the suspended interval K designed in this embodiment is suitable for filling lubricant to wrap the outer wall surface of the rotor support shaft 8. The lubricant can be lubricating oil. The presence of lubricating oil here can further ensure the lubrication and fit between the rotor support shaft 8 and the rotor injection molding body 1, thereby further optimizing the noise reduction effect. That is to say, in this embodiment, by installing the fixing plug 3 in the hollow cavity 11 in the rotor injection molding body 1, on the one hand, a rotation support for the rotor support shaft 8 is formed together, and on the other hand, a suspended interval K for accommodating lubricant is formed between the fixing plug 3 and the hollow cavity 11, so that the lubricant can maintain its effective contact and fit with the rotor support shaft 8.

[0066] In addition, it is necessary to explain that, for the rotor assembly of this embodiment, the axial hole 21 in the output shaft 2 and the through hole 31 in the fixing plug 3 can both be traditional circular holes 62 that form a clearance fit with the outer diameter of the rotor support shaft 8.

[0067] Furthermore, the rotor assembly of the present embodiment further comprises a magnetic ring 5 disposed on the outer peripheral side of the rotor injection molding body 1, and the magnetic ring 5 is integrally injection molded with the rotor injection molding body 1, so that the magnetic ring 5 is firmly matched with the outer wall of the rotor injection molding body 1. In order to improve the firmness of the combined structure formed by the magnetic ring 5 and the rotor injection molding body 1, the edges of the two axial ends of the magnetic ring 5 in the present embodiment are respectively formed with raised annular ribs 51, and an L-shaped step surface 52 is formed between each annular rib 51 and the axial end of the magnetic ring 5; and at least one sinking groove 53 is formed on the axial end of each magnetic ring 5, and a boss 13 for matching with at least one sinking groove 53 is injection molded on the corresponding rotor injection molding body 1.

[0068] Specifically, the protrusion height t1 of the annular rib 51 relative to the axial end of the magnetic ring 5 is ≥ 0.3 mm to prevent incomplete injection molding, and t1 is smaller than the depth t2 of the recess 53 .

[0069] The present embodiment can prevent the rotor injection molded body 1 from slipping due to the tangential force during operation by designing the annular rib 51; the magnetic ring 5 does not need to be oriented when placed in the mold during injection molding, which is convenient for processing and has good product quality. The design of the sink 53 allows the two ends of the rotor injection molded body 1 to be hooked in the sink 53 after injection molding, preventing the rotor injection molded body 1 from falling off from the magnetic ring 5 after long-term operation of the permanent magnet rotor.

[0070] Embodiment 2:

[0071] See also Figures 1 to 8 As shown, based on the rotor assembly of Example 1, the rotor assembly provided in this embodiment is further designed as follows in order to further reduce the contact area between the rotor assembly and the rotor support shaft 8:

[0072] First is the shaft hole 21 of the output shaft 2:

[0073] The shaft hole 21 of this embodiment includes at least one section of regular polygonal hole 6, that is, the entire shaft hole 21 may be a regular polygonal hole 6, or a circular hole 62 and a regular polygonal hole 6 that are connected and connected, and the inscribed circle of the regular polygonal hole 6 is coaxial with the circular hole 62. The inner diameter of the inscribed circle of the regular polygonal hole 6 here is not less than the inner diameter of the circular hole 62. Under this structure, the regular polygonal hole 6 and the outer wall surface of the rotor support shaft 8 form a non-fully surrounded contact fit, so the contact area between the shaft hole 21 and the rotor support shaft 8 can be reduced. When the inner diameter of the inscribed circle of the regular polygonal hole 6 is greater than the inner diameter of the circular hole 62, the effective contact length between the shaft hole 21 and the rotor support shaft 8 can be reduced. Since the shrinkage rate of the entire hole is inconsistent due to the injection molding conditions during the injection molding of the shaft hole 21, this will cause the entire hole to be irregular, and reducing the length of the shaft hole 21 can reduce the problem of the irregularity of the entire hole caused by the inconsistent shrinkage rate, thereby reducing the noise problem when the shaft hole 21 and the rotor support shaft 8 are matched.

[0074] It should be noted that, in combination with the actual use orientation of the rotor assembly, if the output shaft 2 is above the rotor injection molding 1, the shaft hole 21 adopts an integrated regular polygon hole 6 or a combination of the regular polygon hole 6 and the circular hole 62 to meet the use requirements, and for the integrated regular polygon hole 6, although there is no full contact fit between the outer wall of the rotor support shaft 8 and the inner wall of the regular polygon hole 6, considering the direction of the gravity of the lubricant, it is difficult for the lubricant to overflow from the gap between the outer wall of the rotor support shaft 8 and the inner wall of the regular polygon hole 6. If the output shaft 2 is below the rotor injection molding 1, the shaft hole 21 preferably adopts a combination of the regular polygon hole 6 and the circular hole 62 to meet the use requirements, and considering the prevention of the lubricant from overflowing outward along the outer wall of the rotor support shaft 8 and the inner wall of the shaft hole 21, the circular hole 62 is located below the regular polygon hole 6.

[0075] It is necessary to explain that when the shaft hole 21 is an integrated regular polygon hole 6, the inner diameter of the inscribed circle of the regular polygon hole 6 forms a clearance fit with the outer wall of the rotor support shaft 8, that is, the regular polygon hole 6 forms a rotation support for the rotor support shaft 8, such as the midpoints of the six sides of the regular hexagonal hole are in contact with the outer wall surface of the rotor support shaft 8. When the shaft hole 21 is a circular hole 62 connected to the regular polygon hole 6, the circular hole 62 can be used to form the rotation support for the rotor support shaft 8, and the inscribed circle of the regular polygon hole 6 can be in contact with the rotor support shaft 8 or not, and there is no absolute limitation on this.

[0076] Next is the through hole 31 in the fixing plug 3:

[0077] The through hole 31 of this embodiment includes at least one section of regular polygonal hole 6, that is, the entire through hole 31 may be a regular polygonal hole 6, or a circular hole 62 and a regular polygonal hole 6 that are connected through each other, and the inscribed circle of the regular polygonal hole 6 is coaxial with the circular hole 62. The inner diameter of the inscribed circle of the regular polygonal hole 6 here is not less than the inner diameter of the circular hole 62. Under this structure, the regular polygonal hole 6 forms a non-fully enclosed contact fit with the outer wall surface of the rotor support shaft 8, so the contact area between the through hole 31 and the rotor support shaft 8 can be reduced.

[0078] It should be noted that, in combination with the actual use orientation of the rotor assembly, if the output shaft 2 is below the rotor injection molding 1, the through hole 31 adopts an integrated regular polygon hole 6 or a combination of the regular polygon hole 6 and the circular hole 62 to meet the use requirements, and for the integrated regular polygon hole 6, although there is no full contact fit between the outer wall of the rotor support shaft 8 and the inner wall of the regular polygon hole 6, considering the direction of the gravity of the lubricant, it is difficult for the lubricant to overflow from the gap between the outer wall of the rotor support shaft 8 and the inner wall of the regular polygon hole 6. If the output shaft 2 is above the rotor injection molding 1, the through hole 31 preferably adopts a combination of the regular polygon hole 6 and the circular hole 62 to meet the use requirements, and considering the prevention of the lubricant from overflowing outward along the outer wall of the rotor support shaft 8 and the inner wall of the through hole 31, the circular hole 62 is located below the regular polygon hole 6.

[0079] It is necessary to explain that when the through hole 31 is an integrated regular polygon hole 6, the inner diameter of the inscribed circle of the regular polygon hole 6 forms a clearance fit with the outer wall of the rotor support shaft 8, that is, the regular polygon hole 6 forms a rotation support for the rotor support shaft 8, such as the midpoints of the six sides of the regular hexagonal hole are in contact with the outer wall surface of the rotor support shaft 8. When the through hole 31 is a circular hole 62 connected to the regular polygon hole 6, the circular hole 62 can be used to form the rotation support for the rotor support shaft 8, and the inscribed circle of the regular polygon hole 6 can be in contact with the rotor support shaft 8 or not, and there is no absolute limitation on this.

[0080] It should be noted that in the present embodiment, the shaft hole 21 may include at least one regular polygonal hole 6 and the through hole 31 may be integrated with the circular hole 62; or the through hole 31 may include at least one regular polygonal hole 6 and the shaft hole 21 may be integrated with the circular hole 62. These situations also meet the use requirements of the present embodiment.

[0081] In summary, for the rotor assembly of the present embodiment, the regular polygonal hole 6 formed in the shaft hole 21 and / or the through hole 31 can, on the one hand, reduce the contact area with the rotor support shaft 8, and on the other hand, form a lubricant storage space 61 at the fitting gap between the regular polygonal hole 6 and the rotor support shaft 8, so that the lubricant can achieve a lubrication effect on the rotational fit formed between the rotor support shaft 8 and the rotor assembly, thereby further reducing the operating noise.

[0082] Embodiment 3:

[0083] See also Figure 1 and Fig.13As shown, based on the rotor assembly of Example 1 or Example 2, this embodiment provides a motor, including: the rotor assembly of Example 1 or Example 2, a rotor support shaft 8 matched with the rotor assembly, and a casing arranged on the outside of the rotor assembly.

[0084] The housing used in this embodiment includes a shell 71 for accommodating the rotor assembly and a cover plate 72 for covering the shell 71 , wherein one end of the rotor support shaft 8 is matched with the shell 71 , and the other end is matched with the cover plate 72 .

[0085] More specifically, the diameter of the rotor support shaft 8 used in this embodiment is d3, and the head of the rotor support shaft 8 that matches the cover plate 72 is provided with a chamfer 81, the diameter of the chamfer 81 is d4, and the length of the chamfer 81 is L3; the diameter of the hole on the cover plate 72 that matches the rotor support shaft 8 is D3, and the hole depth is L4; then d3 is less than D3, d4 is greater than or equal to D3, and L3 is less than L4. Under this design, when the cover plate 72 and the rotor support shaft 8 are assembled, the assembly is simple, because d3 is less than D3, the cover plate 72 is easy to enter the hole; d4 is greater than or equal to D3, and L3 is less than L4, which can achieve an interference fit between the rotor support shaft 8 and the cover plate 72, prevent the rotor support shaft 8 from shaking when the rotor assembly is running, and further achieve the purpose of noise reduction.

[0086] In addition, in an optional implementation, three grooves 73 are provided on the shell 71, one of which has a width of D1, and the other two grooves 73 are arranged opposite to each other and have a width of D2; the corresponding cover plate 72 is designed with three ribs 74 corresponding to the three grooves 73 on the shell 71, one of which has a width of d1, and the other two ribs 74 are arranged opposite to each other and have a width of d2, and the ribs 74 and the corresponding grooves 73 are transitionally matched.

[0087] The three ribs 74 on the cover plate 72 cooperate with the three grooves 73 on the shell 71, so that the position of the cover plate 72 and the shell 71 is fixed, and the displacement of the cover plate 72 during riveting causes the rotor support shaft 8 on the cover plate 72 to tilt; under normal circumstances, the rotor assembly is restricted by the cover plate 72 and the shell 71. When the rotor support shaft 8 is assembled and the cover plate 72 is riveted, the cover plate 72 is displaced during riveting and causes the rotor support seat connected thereto to tilt, which causes the rotor assembly to have a stuck point with the rotor support shaft 8 during rotation, generating noise; and the groove-rib matching structure can keep the cover plate 72 fixed to the shell 71 during riveting, thereby preventing the displacement of the cover plate 72 from causing the rotor support shaft 8 to tilt, effectively improving the stability of the rotor assembly on the rotor support shaft 8 and achieving noise reduction.

[0088] The motor of this embodiment can be applied to high-end equipment and can reduce the noise of the high-end equipment to which the motor is applied.

[0089] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0090] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0091] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0092] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0093] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0094] In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A rotor assembly, characterized in that: include: The rotor injection molding body has a hollow cavity formed inside thereof which passes through both axial ends thereof; an output shaft is integrally injection-molded at one axial side end of the rotor injection molding body; an axial hole for matching the rotor support shaft is formed between the output shaft and the hollow cavity; A magnetic ring is injection molded on the outer peripheral side of the rotor injection molded body; A fixing plug is adapted to be inserted into the hollow cavity from the end of the rotor injection molding away from the output shaft; and a through hole is formed in the fixing plug and is coaxially connected with the shaft hole; wherein At least one suspended section which is not in complete contact with the outer wall surface of the rotor support shaft is formed in the hollow cavity and / or the fixing plug.

2. The rotor assembly according to claim 1, characterized in that The suspended space is suitable for being filled with lubricant to cover the outer wall surface of the rotor support shaft.

3. The rotor assembly according to claim 1, characterized in that: The fixing plug is interference fit with the hollow cavity.

4. The rotor assembly according to claim 1, characterized in that: The depth to which the fixing plug is inserted into the hollow cavity is less than the depth of the hollow cavity; and The suspended area is formed between the hollow cavity and the fixing plug.

5. The rotor assembly according to claim 1, characterized in that: The fixing plug is inserted into the hollow cavity to a depth equal to the depth of the hollow cavity, so that the fixing plug fills the hollow cavity in the axial direction; and The suspended area is formed in the fixing plug.

6. The rotor assembly according to claim 4 or 5, characterized in that: The through hole is a circular hole used for clearance matching with the rotor support shaft.

7. The rotor assembly according to claim 4 or 5, characterized in that: The through hole comprises a regular polygonal hole and a circular hole which are connected to each other, and the circular hole is located at the side end of the regular polygonal hole facing away from the output shaft of the rotor injection molding body; wherein The circular hole is suitable for clearance fit with the rotating shaft support shaft; and The inscribed circle of the regular polygonal hole is coaxial with the circular hole, and the inner diameter of the inscribed circle of the regular polygonal hole is not less than the inner diameter of the circular hole.

8. The rotor assembly according to claim 4 or 5, characterized in that: The shaft hole is a circular hole for clearance fit with the rotor support shaft; or The shaft hole is a regular polygonal hole, and the inscribed circle of the regular polygonal hole is in clearance fit with the rotor support shaft.

9. The rotor assembly according to claim 1, characterized in that: The edges of the two axial ends of the magnetic ring are respectively formed with raised annular ribs, and an L-shaped step surface is formed between each of the annular ribs and the axial end of the magnetic ring; and At least one recessed groove is formed on the axial end of each magnetic ring.

10. A motor, characterized in that: include: A rotor assembly as claimed in any one of claims 1 to 9, a rotor support shaft matched with the rotor assembly, and a casing arranged outside the rotor assembly.

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