Injection molded rotor and motor

Abstract

The utility model belongs to motor technical field, concretely relates to a kind of injection molding rotor and motor.The injection molding rotor of the utility model includes: rotor core and the injection molding layer of at least the part outer surface of covering rotor core;The rotor core includes: the multiple sector parts of circumferential array, first magnetic steel is arranged between adjacent sector part and extends radially;And, second magnetic steel is arranged on the upper end surface and lower end surface of the sector part;Wherein first positioning hole is arranged on the end surface of the sector part;Second positioning hole coaxial with first positioning hole is arranged on the second magnetic steel;Several third positioning holes coaxial with first positioning hole are arranged on the injection molding layer;Third positioning hole, second positioning hole and first positioning hole constitute balance hole;Balance filler is arranged in several balance holes.The injection molding rotor of the utility model is easy to form, does not need additional end cap;And, each positioning hole can also be used as balance hole after rotor injection molding, need not to be additionally arranged, save process and material.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to an injection-molded rotor and motor. Background Technology

[0002] Radial flux motors typically include permanent magnets positioned within a rotor core, often referred to as an internal permanent magnet rotor. The rotor is formed by multiple laminations and circumferentially spaced poles. Slots are formed between adjacent poles, and magnets are inserted into these slots. Additionally, in some motors, auxiliary magnets can be placed on both end faces of the rotor core to increase the average flux density around the rotor circumference, thereby improving motor efficiency.

[0003] Patent CN117639330A discloses a radial spoke rotor with an axial auxiliary magnet, which includes the auxiliary magnet as described above. However, during assembly, this type of rotor requires two end caps, a magnet retaining plate, and fasteners to fix the auxiliary magnet to the rotor pole pieces. This assembly method is complex and has low production efficiency. Furthermore, the balance slots of this type of rotor are located on the magnet retaining plate, requiring additional balance holes in the end caps besides the fixing holes for the fasteners to be made during rotor balancing. Utility Model Content

[0004] The purpose of this invention is to provide an injection-molded rotor and motor to solve the above-mentioned technical problems.

[0005] This application provides an injection-molded rotor, comprising: a rotor core, and an injection-molded layer covering at least a portion of the outer surface of the rotor core; The rotor core includes: a plurality of sector-shaped portions arranged in a circumferential array, with radially extending first magnets disposed between adjacent sector-shaped portions; and second magnets disposed on both the upper and lower end faces of the sector-shaped portions; wherein... A first positioning hole is provided on the end face of the sector-shaped part; The second magnet is provided with a second positioning hole that is coaxial with the first positioning hole; The injection-molded layer is provided with a plurality of third positioning holes coaxial with the first positioning hole; The third positioning hole, together with the second positioning hole and the first positioning hole, forms a balance hole; A certain number of the balance holes are provided with balance packing.

[0006] In one embodiment of this application, the diameter of the second positioning hole is not less than the diameter of the first positioning hole.

[0007] In one embodiment of this application, the diameter of the third positioning hole is not less than the diameter of the second positioning hole.

[0008] In one embodiment of this application, the rotor core further includes two magnet connecting frames, which are respectively used to connect a ring of second magnets located on the upper or lower end face of the sector portion.

[0009] In one embodiment of this application, the magnetic steel connecting frame includes: a first connecting ring, and a clamp assembly arranged in a circumferential array on the connecting ring; The clamp assembly is used to fix the corresponding second magnet.

[0010] In one embodiment of this application, the clamp assembly includes: The longitudinal clamping bar has its two ends tightly clamped to the upper and lower end faces of the second magnet, respectively; The first transverse clamping bar has its two ends tightly clamped to the left and right end faces of the second magnet, respectively.

[0011] In one embodiment of this application, the magnetic steel connecting frame further includes: a second connecting ring, connected to each longitudinal clamping strip; and The second connecting ring is also provided with several second transverse clamping strips, the two ends of which are respectively clamped to the left and right end faces of the second magnet.

[0012] In one embodiment of this application, the magnetic steel connecting frame is provided with a fifth positioning hole that corresponds one-to-one with the second positioning hole.

[0013] Accordingly, this application provides an electric motor including the injection-molded rotor as described above.

[0014] The beneficial effects of this utility model are: Unlike existing technologies, this application provides an injection-molded rotor, comprising: a rotor core, and an injection-molded layer covering at least a portion of the outer surface of the rotor core; the rotor core includes: a plurality of fan-shaped portions arranged in a circumferential array, with a radially extending first magnet disposed between adjacent fan-shaped portions; and a second magnet disposed on both the upper and lower end faces of the fan-shaped portions; wherein a first positioning hole is disposed on the end face of the fan-shaped portion; a second positioning hole coaxial with the first positioning hole is disposed on the second magnet; a plurality of third positioning holes coaxial with the first positioning holes are disposed on the injection-molded layer; the third positioning holes, the second positioning holes, and the first positioning holes constitute balance holes; and balance filler is disposed in the plurality of balance holes. The injection-molded rotor of this invention is easy to mold, requiring no additional end caps; furthermore, each positioning hole can also serve as a balance hole after the rotor is injection-molded, eliminating the need for additional configuration and saving processes and materials.

[0015] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0016] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a perspective view of an injection-molded rotor according to a preferred embodiment of the present invention; Figure 2 This is a schematic diagram of the rotor core assembly according to a preferred embodiment of the present invention; Figure 3 This is a partial cross-sectional view of the rotor core of a preferred embodiment of the present invention; Figure 4 This is a schematic diagram of a rotor core according to a preferred embodiment of the present invention; Figure 5 This is a schematic diagram of a preferred embodiment of the magnetic steel connecting frame of this utility model.

[0019] In the picture: Rotor core 1, sector 11, first positioning hole 111, first magnet 12, second magnet 13, second positioning hole 131, magnet connecting frame 14, first connecting ring 141, clamp assembly 142, longitudinal clamp strip 1421, first transverse clamp strip 1422, second connecting ring 143, second transverse clamp strip 1431, fifth positioning hole 144, injection molding layer 2, third positioning hole 21, balance hole 211. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] This application provides an injection-molded rotor and a motor, which are described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0022] See Figure 1 , Figure 2 and Figure 3 In one embodiment, the injection-molded rotor includes: a rotor core 1, and an injection-molded layer 2 covering at least a portion of the outer surface of the rotor core 1; the rotor core 1 includes: a plurality of fan-shaped portions 11 arranged in a circumferential array, with a radially extending first magnet 12 disposed between adjacent fan-shaped portions 11; and a second magnet 13 disposed on both the upper and lower end faces of the fan-shaped portions 11; wherein a first positioning hole 111 is disposed on the end face of the fan-shaped portion 11; a second positioning hole 131 coaxial with the first positioning hole 111 is disposed on the second magnet 13; a plurality of third positioning holes 21 coaxial with the first positioning hole 111 are disposed on the injection-molded layer 2; the third positioning holes 21, the second positioning holes 131, and the first positioning holes 111 constitute a balance hole 211; and balance filler is disposed in the plurality of balance holes 211.

[0023] In this embodiment, the first positioning hole 111 and the second positioning hole 131 can be positioning holes for the insertion of positioning fixtures or mold positioning pins during injection molding; the third positioning hole 21 can be a process hole after injection molding when the positioning fixtures or mold positioning pins are removed. In some embodiments, the second positioning hole 131 can be a through hole; the first positioning hole 111 can be a through hole, or it can be a blind hole provided on both the upper and lower end faces of the fan-shaped portion 11. In some embodiments, some or all of the balance holes 211 can be provided with balance packing for adjusting the rotor rotation balance; of course, it is also possible that no balance packing is provided in any of the balance holes 211, and the rotor is balanced.

[0024] Optionally, the diameter of the second positioning hole 131 is not less than the diameter of the first positioning hole 111.

[0025] Optionally, the diameter of the third positioning hole 21 is not less than the diameter of the second positioning hole 131.

[0026] See Figure 4 In one embodiment, to facilitate the assembly and fixation of the second magnet 13, the rotor core 1 further includes two magnet connecting frames 14, which are used to connect a ring of second magnets 13 located on the upper or lower end face of the sector portion 11, respectively.

[0027] See Figure 5Optionally, the magnet connecting frame 14 includes: a first connecting ring 141, and a clamp assembly 142 arranged in a circumferential array on the connecting ring; the clamp assembly 142 is used to fix the corresponding second magnet 13.

[0028] Specifically, the clamp assembly 142 includes: a longitudinal clamp strip 1421, the two ends of which are respectively clamped to the upper and lower end faces of the second magnet 13; and a first transverse clamp strip 1422, the two ends of which are respectively clamped to the left and right end faces of the second magnet 13.

[0029] Of course, in some embodiments, there can be multiple longitudinal clamping strips 1421 and first transverse clamping strips 1422.

[0030] Optionally, the magnet connecting frame 14 further includes: a second connecting ring 143 connected to each longitudinal clamping strip 1421; and a plurality of second transverse clamping strips 1431 are also provided on the second connecting ring 143, the two ends of which are respectively clamped to the left and right end faces of the second magnet 13.

[0031] See Figure 3 and Figure 5 Optionally, the magnetic steel connecting frame 14 is provided with a fifth positioning hole 144 that corresponds one-to-one with the second positioning hole 131.

[0032] Accordingly, one embodiment of this application provides an electric motor that includes the injection-molded rotor as described above.

[0033] It should be noted that all the devices (parts whose specific structures are not specified) selected in this application are general standard parts or parts known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0034] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. An injection-molded rotor, characterized in that, include: Rotor core (1), and injection molding layer (2) covering at least part of the outer surface of rotor core (1); The rotor core (1) includes: a plurality of sector-shaped portions (11) arranged in a circumferential array, with a first magnet (12) extending radially between adjacent sector-shaped portions (11); and a second magnet (13) provided on both the upper and lower end faces of each sector-shaped portion (11); wherein A first positioning hole (111) is provided on the end face of the fan-shaped part (11). The second magnet (13) is provided with a second positioning hole (131) coaxial with the first positioning hole (111). The injection molding layer (2) is provided with a plurality of third positioning holes (21) coaxial with the first positioning hole (111). The third positioning hole (21), together with the second positioning hole (131) and the first positioning hole (111), forms a balance hole (211). A certain number of the balance holes (211) are provided with balance packing.

2. The injection-molded rotor according to claim 1, characterized in that, The diameter of the second positioning hole (131) is not less than the diameter of the first positioning hole (111).

3. The injection-molded rotor according to claim 1, characterized in that, The diameter of the third positioning hole (21) is not less than the diameter of the second positioning hole (131).

4. The injection-molded rotor according to claim 1, characterized in that, The rotor core (1) also includes two magnet connecting frames (14), which are used to connect a ring of second magnets (13) located on the upper or lower end face of the sector (11).

5. The injection-molded rotor according to claim 4, characterized in that, The magnetic steel connecting frame (14) includes: a first connecting ring (141) and a clamp assembly (142) arranged in a circumferential array on the connecting ring. The clamp assembly (142) is used to fix the corresponding second magnet (13).

6. The injection-molded rotor according to claim 5, characterized in that, The clamp assembly (142) includes: The longitudinal clamping bar (1421) has its two ends tightly clamped to the upper and lower end faces of the second magnet (13); The first transverse clamping bar (1422) has its two ends tightly clamped to the left and right end faces of the second magnet (13).

7. The injection-molded rotor according to claim 6, characterized in that, The magnetic steel connecting frame (14) further includes: a second connecting ring (143) connected to each longitudinal clamping strip (1421); and The second connecting ring (143) is also provided with several second transverse clamping strips (1431), the two ends of which are respectively clamped to the left and right end faces of the second magnet (13).

8. The injection-molded rotor according to claim 4, characterized in that, The magnetic steel connecting frame (14) is provided with a fifth positioning hole (144) that corresponds one-to-one with the second positioning hole (131).

9. An electric motor, characterized in that, Including the injection-molded rotor as described in any one of claims 1-8.

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