Rotor assembly and electric machine
By using an integrated rotor assembly design, including injection molding of the impeller body and magnetic ring inserts, the problems of breakage and detachment during impeller assembly are solved, achieving stable assembly and simplified production, and reducing electromagnetic noise risks and production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANHUI AOCHUANGDA TECHNOLOGY CO LTD
- Filing Date
- 2025-07-18
- Publication Date
- 2026-05-29
AI Technical Summary
In the existing assembly process of impeller and motor shaft, the impeller is prone to breakage due to excessive assembly force or detachment due to insufficient assembly force. Furthermore, the magnetic tile pasting process is difficult to guarantee uniformity and stability, resulting in large imbalance, electromagnetic noise, and a high risk of magnetic tile detachment.
The rotor assembly adopts a one-piece molding design, including the impeller body and the magnetic ring. The magnetic ring is injection molded with the assembly end insert, eliminating the need for magnetic tile pasting. Synchronous rotation is achieved through anti-rotation protrusions and groove structures, preventing the impeller from detaching and the magnetic tile from falling off.
The problem of impeller breakage and detachment has been solved, assembly stability has been improved, imbalance has been reduced, electromagnetic noise risk has been reduced, production process has been simplified, and costs have been reduced.
Smart Images
Figure CN224305551U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of electric motors, and in particular to a rotor assembly and an electric motor. Background Technology
[0002] The existing impeller and motor are assembled together by press-fitting the motor shaft with the impeller mounting hole through interference fit or by screw connection, and then dynamic balancing is performed.
[0003] Because the impeller is a plastic part, and its central mounting hole is injection molded, dimensional accuracy and concentricity are difficult to control. It is also greatly affected by thermal expansion and contraction and is prone to deformation. Therefore, it is difficult to guarantee the force that the motor shaft presses into the impeller. If it is too large, it will easily break; if it is too small, the pushing force cannot be guaranteed, and it will easily fall off during operation.
[0004] After the impeller and motor rotor are assembled, it is difficult to ensure the balance, and it is necessary to adjust the balance by adding weight; moreover, there are many process parameters in the assembly process (such as pressing force, pressing displacement, imbalance, runout, vibration), which makes control difficult, results in more defective products, and increases production costs.
[0005] Furthermore, the pressing process requires drilling holes in the motor base to expose the motor shaft so that the tooling can support the motor shaft from below during the pressing process. Drilling holes in the base makes it difficult to arrange the PCB board, and holes also need to be drilled in the middle. It is difficult to meet the waterproof, dustproof and moisture-proof process of the PCB board, and conformal coating must be applied, which increases the cost.
[0006] The production process has added a motor rotor magnet bonding and assembly line, impeller and rotor pressing equipment, and multiple balancing machines. The magnets are bonded to the machine casing piece by piece, and it is difficult to ensure the uniformity of the circumferential indexing, resulting in uneven magnetic pole distribution and electromagnetic noise.
[0007] It is difficult to ensure the balance of the motor rotor, and the balance needs to be corrected by cutting the housing. The vibration generated during the cutting process may cause cracks in the magnets, which may lead to their falling off during use; the cut surface is also prone to corrosion during use.
[0008] The magnetic tile bonding process involves heating and curing epoxy adhesive. Since the magnetic tile is ceramic, its thermal expansion and contraction are inconsistent with the steel plate of the casing, which poses a risk of cracking after cooling. It is also difficult to guarantee the amount of adhesive applied during the bonding process. If too little adhesive is applied, the tile will not bond well and will easily fall off. If too much adhesive is applied, it will cause the tile to run during the curing process, increasing the imbalance value.
[0009] The motor shaft is connected to the impeller by screws. Pickling during the screw manufacturing process may cause hydrogen embrittlement and fracture of the screws. Utility Model Content
[0010] The purpose of this utility model is to provide a rotor assembly and a motor to alleviate the technical problems of impeller damage caused by excessive force during the assembly process of the motor shaft and impeller, and impeller easy detachment due to insufficient force.
[0011] This utility model provides a rotor assembly, including an integrally formed rotor assembly body. The rotor assembly body includes an impeller body and an assembly end. A magnetic ring is sleeved on the outer side of the assembly end, and the magnetic ring is injection molded into the assembly end.
[0012] In an optional embodiment, multiple anti-rotation protrusions are provided at both ends of the magnetic ring along its axial direction, and the multiple anti-rotation protrusions are evenly arranged along the circumference of the magnetic ring.
[0013] In an optional embodiment, the anti-rotation protrusions at one end of the magnetic ring are staggered with the anti-rotation protrusions at the other end of the magnetic ring.
[0014] In an optional embodiment, a mounting groove is provided on the periphery of the assembly end, and an anti-rotation groove matching the anti-rotation protrusion is provided in the mounting groove.
[0015] In an optional embodiment, the impeller body includes a hub, the mounting end is disposed on the hub, and a plurality of blades are disposed on the hub.
[0016] In an optional embodiment, a first base ring is also included, wherein one end of the blade is connected to the hub and the other end is connected to the first base ring;
[0017] The blade extends axially along the magnetic ring or extends radially along the magnetic ring.
[0018] In an optional embodiment, the assembly end has an assembly chamber for assembling the motor shaft.
[0019] In an optional embodiment, the assembly end has a bearing chamber embedded therein, and the bearing chamber and the assembly end are injection molded inserts.
[0020] In an optional embodiment, a plurality of raised ribs are provided on the outer periphery of the bearing housing, and the plurality of raised ribs are evenly distributed along the periphery of the bearing housing.
[0021] This utility model provides a rotor assembly, which is integrally formed, with a magnetic ring injection-molded into the assembly end. This eliminates the need to assemble the motor shaft and impeller, thus avoiding the problems of impeller breakage due to excessive force during assembly, and impeller easy detachment from the motor shaft due to insufficient force. Furthermore, the use of a magnetic ring injection-molded into the assembly end eliminates the need for magnetic tile pasting, and also solves the problem of magnetic tiles easily falling off.
[0022] This utility model provides an electric motor, including the rotor assembly described in any of the foregoing embodiments.
[0023] Compared with the prior art, the motor provided by this utility model has the rotor assembly provided by this utility model, and thus has all the beneficial effects of the rotor assembly provided by this utility model. Attached Figure Description
[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0025] Figure 1 This is a schematic diagram of the rotor assembly provided in an embodiment of the present utility model;
[0026] Figure 2 for Figure 1 A schematic diagram of the longitudinal section of the rotor assembly shown;
[0027] Figure 3 for Figure 1 The diagram shows the structural schematic of the main body of the rotor assembly.
[0028] Figure 4 for Figure 1 A schematic diagram of the magnetic ring structure of the rotor assembly shown;
[0029] Figure 5 for Figure 1 A schematic diagram of the bearing housing of the rotor assembly shown;
[0030] Figure 6 This is another structural schematic diagram of the rotor assembly provided in an embodiment of the present utility model.
[0031] Icons: 100-Hub; 200-Blade; 300-First base ring; 400-Assembly end; 500-Magnetic ring; 501-Anti-rotation protrusion; 600-Bearing chamber; 601-Rib; 700-Assembly chamber; 800-Mounting groove; 900-Anti-rotation groove; 110-Rotor assembly body; 120-Impeller body. Detailed Implementation
[0032] The terms “first,” “second,” “third,” etc., are used only for distinguishing descriptions and do not indicate a sequence number, nor should they be interpreted as indicating or implying relative importance.
[0033] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0034] In the description of this application, it should be noted that the terms "inner", "outer", "left", "right", "upper", "lower", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and 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. Therefore, they should not be construed as limitations on this application.
[0035] In the description of this application, unless otherwise expressly specified and limited, the terms “set up,” “install,” “connect,” and “link” shall be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; as a mechanical connection or an electrical connection; as a direct connection or an indirect connection through an intermediate medium; or as a connection within two components.
[0036] The technical solution of this application will now be clearly and completely described with reference to the accompanying drawings.
[0037] Example
[0038] Reference Figures 1-6 This utility model provides a rotor assembly, including an integrally formed rotor assembly body 110. The rotor assembly body 110 includes an impeller body 120 and an assembly end 400. A magnetic ring 500 is sleeved on the outer side of the assembly end 400, and the magnetic ring 500 is injection molded into the assembly end 400.
[0039] In some embodiments, the rotor assembly body 110 and the magnetic ring 500 are injection molded in the same mold, and the magnetic ring 500 is attached to the assembly end 400.
[0040] The magnetic ring 500 is directly embedded into the assembly end 400. Compared with the existing technology, it eliminates the need for a magnetic tile pasting assembly line and also solves the problem that it is difficult to ensure the uniformity of the circumferential indexing when magnetic tiles are pasted onto the housing piece by piece, resulting in uneven magnetic pole distribution and electromagnetic noise.
[0041] Since the magnetic ring 500 is directly embedded into the assembly end 400, no adhesive is required. This avoids the risk of the magnetic tile cracking after cooling due to the inconsistent thermal expansion and contraction between the ceramic and steel components of the housing caused by the epoxy adhesive being heated during the bonding process. It is also difficult to guarantee the amount of adhesive applied for bonding the magnetic tile. If too little adhesive is applied, the tile will not adhere well and may fall off. If too much adhesive is applied, it may cause the tile to run during the curing process, resulting in an increased imbalance.
[0042] The rotor assembly is integrally formed, and the assembly end 400 of the rotor assembly is injection molded with a magnetic ring 500. This eliminates the need to assemble the motor shaft and the impeller, thus avoiding the problem of impeller breakage due to excessive force during assembly, and impeller easy detachment from the motor shaft due to insufficient force. Furthermore, the use of magnetic ring 500 and assembly end 400 injection molded inserts eliminates the process of pasting magnetic tiles, which also solves the problem of magnetic tiles easily falling off.
[0043] Reference Figure 4 In an optional embodiment, the magnetic ring 500 has multiple anti-rotation protrusions 501 at both ends of its axial direction, and the multiple anti-rotation protrusions 501 are evenly arranged along the circumference of the magnetic ring 500.
[0044] In an optional embodiment, the anti-rotation protrusion 501 at one end of the magnetic ring 500 is staggered with the anti-rotation protrusion 501 at the other end of the magnetic ring 500.
[0045] Reference Figure 3 In an optional embodiment, the mounting end 400 is provided with a mounting groove 800 on its periphery, and an anti-rotation groove 900 matching the anti-rotation protrusion 501 is provided in the mounting groove 800.
[0046] In some embodiments, since the magnetic ring 500 needs to drive the impeller body 120 to rotate, the magnetic ring 500 needs to rotate synchronously with the impeller body 120. An anti-rotation protrusion 501 is provided on the magnetic ring 500. The anti-rotation protrusion 501 is fitted into the anti-rotation groove 900 of the mounting groove 800. In this way, when the magnetic ring 500 rotates, it can drive the mounting end 400 to rotate, thereby driving the impeller body 120 to rotate.
[0047] In order to enable the magnetic ring 500 to apply force to the assembly end 400 more evenly, the anti-rotation protrusions 501 on the magnetic ring 500 are evenly arranged, and the anti-rotation protrusions 501 at both ends of the circumferential direction of the magnetic ring 500 are staggered.
[0048] Reference Figure 1 and Figure 6 In an optional embodiment, the impeller body 120 includes a hub 100, the mounting end 400 is disposed on the hub 100, and a plurality of blades 200 are disposed on the hub 100.
[0049] In an optional embodiment, a first base ring 300 is also included, wherein one end of the blade 200 is connected to the hub 100 and the other end is connected to the first base ring 300.
[0050] In an optional embodiment, the blade 200 extends axially along the magnetic ring 500 or extends radially along the magnetic ring 500.
[0051] In some embodiments, the impeller body 120 has an assembly end 400 on its hub 100. The magnetic ring 500 drives the assembly end 400 to rotate, which in turn drives the hub 100 to rotate, and the hub 100 drives the blades 200 to rotate.
[0052] A blade 200 is provided on the hub 100. The blade 200 can extend radially or circumferentially along the magnetic ring 500. One end of the blade 200 is connected to the hub 100, and the other end is connected to the first base ring 300. The first base ring 300 helps to prevent the multiple blades 200 from deforming during rotation, improves the rotational stability of the impeller body 120, and improves the strength of the impeller body 120.
[0053] Reference Figure 6 In an optional embodiment, the assembly end 400 has an assembly chamber 700 for assembling the motor shaft.
[0054] In an optional embodiment, the assembly end 400 is embedded with a bearing chamber 600, and the bearing chamber 600 and the assembly end 400 are injection molded inserts.
[0055] Reference Figure 5 In an optional embodiment, a plurality of raised ribs 601 are provided on the outer periphery of the bearing chamber 600, and the plurality of raised ribs 601 are evenly arranged along the periphery of the bearing chamber 600.
[0056] The assembly end 400 is used to connect with the motor shaft. An assembly chamber 700 is provided inside the assembly end 400, and a bearing is provided inside the assembly chamber 700, and the bearing is sleeved on the motor shaft.
[0057] To improve the strength of the assembly end 400, a bearing chamber 600 is embedded in the assembly end 400. To enable the bearing chamber 600 to rotate synchronously with the assembly end 400, a plurality of ribs 601 are provided on the outer side of the assembly chamber 700, and the plurality of ribs 601 are evenly arranged along the periphery of the bearing chamber 600. The ribs 601 are inserted into the assembly end 400, and the magnetic ring 500 drives the assembly end 400 to rotate, which in turn drives the bearing chamber 600 to rotate.
[0058] To prevent the bearing housing 600 from detaching from the assembly end 400, an annular retaining plate is provided at one end of the bearing housing 600, which is embedded into the assembly end 400. After the bearing housing 600 is connected to the motor shaft, repeated insertion and removal of the motor shaft will not detach the bearing housing 600 from the assembly end 400, effectively increasing the firmness of the connection between the bearing housing 600 and the assembly end 400.
[0059] This utility model provides a rotor assembly, which is integrally formed. The assembly end 400 of the rotor assembly is injection molded with a magnetic ring 500. This eliminates the need to assemble the motor shaft and impeller, thus avoiding the problems of impeller breakage due to excessive force during assembly, and impeller easy detachment from the motor shaft due to insufficient force. Furthermore, the use of magnetic ring 500 and assembly end 400 injection molded with a magnetic ring eliminates the need for magnetic tile pasting, and also solves the problem of magnetic tiles easily falling off.
[0060] This utility model provides an electric motor, including the rotor assembly described in any of the foregoing embodiments.
[0061] Compared with the prior art, the motor provided by this utility model has the rotor assembly provided by this utility model, and thus has all the beneficial effects of the rotor assembly provided by this utility model.
[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A rotor assembly, characterized in that, The rotor assembly body (110) is integrally formed. The rotor assembly body (110) includes an impeller body (120) and an assembly end (400). A magnetic ring (500) is sleeved on the outside of the assembly end (400), and the magnetic ring (500) is injection molded into the assembly end (400).
2. The rotor assembly according to claim 1, characterized in that, The magnetic ring (500) has multiple anti-rotation protrusions (501) at both ends of its axial direction, and the multiple anti-rotation protrusions (501) are evenly arranged along the circumference of the magnetic ring (500).
3. The rotor assembly according to claim 2, characterized in that, The anti-rotation protrusion (501) at one end of the magnetic ring (500) is staggered with the anti-rotation protrusion (501) at the other end of the magnetic ring (500).
4. The rotor assembly according to claim 2, characterized in that, The mounting end (400) is provided with a mounting groove (800) on its periphery, and an anti-rotation groove (900) matching the anti-rotation protrusion (501) is provided in the mounting groove (800).
5. The rotor assembly according to claim 1, characterized in that, The impeller body (120) includes a hub (100), the mounting end (400) is disposed on the hub (100), and a plurality of blades (200) are disposed on the hub (100).
6. The rotor assembly according to claim 5, characterized in that, It also includes a first base ring (300), one end of the blade (200) is connected to the hub (100), and the other end is connected to the first base ring (300); The blade (200) extends axially along the magnetic ring (500) or the blade (200) extends radially along the magnetic ring (500).
7. The rotor assembly according to claim 1, characterized in that, The assembly end (400) has an assembly chamber (700) for assembling the motor shaft.
8. The rotor assembly according to claim 7, characterized in that, The assembly end (400) is embedded with a bearing chamber (600), and the bearing chamber (600) and the assembly end (400) are injection molded inserts.
9. The rotor assembly according to claim 8, characterized in that, Multiple ribs (601) are provided on the outer periphery of the bearing chamber (600), and the multiple ribs (601) are evenly arranged along the periphery of the bearing chamber (600).
10. An electric motor, characterized in that, Includes the rotor assembly as described in any one of claims 1-9.