Rotor inner iron core, rotor assembly, motor and household appliance

Abstract

The utility model discloses a rotor inner iron core, a rotor assembly, a motor and a household electrical appliance, the rotor inner iron core is provided with a shaft hole, the periphery of the rotor inner iron core comprises a plurality of connecting sections, the connecting sections extend along the direction around the shaft hole, and the plurality of connecting sections are distributed around the shaft hole and are connected end to end to form a non-circular ring shape. According to the rotor inner iron core provided by the embodiment of the utility model, the shaft hole can be utilized to realize the assembly of the rotor inner iron core and the rotating shaft, and the non-circular peripheral edge of the rotor inner iron core can be utilized to improve the connection strength and stability of a rotor assembly, thereby improving the structural strength and stability of the rotor assembly and prolonging the service life of the rotor assembly, and in addition, the magnetic leakage can be reduced. And the working efficiency and the manufacturing efficiency of the motor are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and particularly relates to an inner iron core of a rotor, a rotor assembly, a motor and a household appliance. Background Art

[0002] In a traditional motor, a rotor iron core is connected to a magnetic part, and the relative position between the rotor iron core and the magnetic part needs to be fixed. However, during the operation of the motor, the magnetic part is subjected to a tangential force, which may cause the relative position between the magnetic part and the rotor iron core to shift, affecting the stability of the motor operation. Summary of the Utility Model

[0003] An object of the utility model is to provide an inner iron core of a rotor, a rotor assembly, a motor and a household appliance.

[0004] According to an embodiment of the inner iron core of the rotor of the utility model, the inner iron core of the rotor has a shaft hole, the outer peripheral edge of the inner iron core of the rotor includes a plurality of connecting segments, the connecting segments extend along a direction around the shaft hole, and the plurality of connecting segments are distributed around the shaft hole and are connected end to end to form a non-circular ring.

[0005] According to the inner iron core of the rotor of the embodiment of the utility model, the assembly of the inner iron core of the rotor and the rotating shaft can be realized by using the shaft hole, and the connection strength and stability of the rotor assembly can be improved by using the non-circular outer peripheral edge of the inner iron core of the rotor, so as to improve the structural strength, stability and service life of the rotor assembly. In addition, magnetic leakage can be reduced, and the working efficiency and manufacturing efficiency of the motor can be improved.

[0006] In addition, according to the inner iron core of the rotor of the above embodiment of the utility model, the following additional technical features may further be provided:

[0007] In some embodiments, the plurality of connecting segments include at least one first connecting segment, and the first connecting segment is a straight line segment.

[0008] In some embodiments, the first connecting segments include at least three that are connected end to end around the shaft hole; or, the plurality of connecting segments further include a second connecting segment, the first connecting segment and the second connecting segment are distributed around the shaft hole, and the second connecting segment is a straight line segment; or, the plurality of connecting segments further include a third connecting segment, the first connecting segment and the third connecting segment are distributed around the shaft hole, and the third connecting segment is located between adjacent first connecting segments, and the third connecting segment is an arc segment.

[0009] In some embodiments, the first connecting segment includes at least three regular polygons centered on the center of the shaft hole and constructed by connecting the head and tail around the shaft hole; alternatively, the first connecting segment includes at least two, the second connecting segment includes at least two, and the at least two second connecting segments and the at least two first connecting segments are distributed alternately around the shaft hole, and the straight lines where the at least two second connecting segments are located enclose a regular polygon centered on the center of the shaft hole; alternatively, the distance between the second connecting segment and the center of the shaft hole is not equal to the distance between the first connecting segment and the center of the shaft hole; alternatively, the first connecting segment includes at least two, the third connecting segment includes at least two, and the at least two third connecting segments and the at least two first connecting segments are distributed alternately around the shaft hole; alternatively, the third connecting segment is an arc segment, and the center of the third connecting segment coincides with or is offset from the center of the shaft hole; alternatively, the third connecting segment is an arc segment, and the two ends of the third connecting segment are respectively connected to the endpoints of the adjacent first connecting segment; alternatively, the first connecting segment includes at least two, the third connecting segment includes at least two, and the at least two third connecting segments and the at least two first connecting segments are distributed alternately around the shaft hole and connected end to end, the center of the arc segment is the center of the shaft hole, and the radius of the arc segment is the distance between the endpoint of the first connecting segment and the center of the shaft hole.

[0010] In some embodiments, the distance h1 between the first connecting segment and the edge of the shaft hole, the diameter dimension D1 of the shaft hole, and the length dimension w1 of the first connecting segment satisfy 0.1 ≤ w1 / (h1 + D1 / 2) ≤ 2.

[0011] In some embodiments, the plurality of connecting segments includes at least one fourth connecting segment, and the fourth connecting segment is an arc segment.

[0012] In some embodiments, the center of the fourth connecting segment coincides with or is offset from the center of the shaft hole; alternatively, the plurality of connecting segments further includes a fifth connecting segment, and the fifth connecting segment and the fourth connecting segment are distributed around the shaft hole, and the fifth connecting segment is a straight line segment; alternatively, the plurality of connecting segments further includes a sixth connecting segment, and the sixth connecting segment and the fourth connecting segment are distributed around the shaft hole, and the sixth connecting segment is an arc segment.

[0013] In some embodiments, the at least two fourth connecting segments are located on the same circumference centered on the center of the shaft hole; alternatively, the sixth connecting segment includes at least two, and the at least two sixth connecting segments and the at least two fourth connecting segments are distributed alternately around the shaft hole and connected end to end; alternatively, the sixth connecting segment is an arc segment, the fourth connecting segment is an arc segment, and the radii of the fifth connecting segment and the fourth connecting segment are different.

[0014] In some embodiments, the outer periphery of the inner iron core of the rotor is rotationally symmetric about the center of the shaft hole.

[0015] In some embodiments, the inner iron core of the rotor is provided with a first injection hole, and the first injection hole is arranged on the outer periphery, the inner periphery or between the outer periphery and the inner periphery of the inner iron core of the rotor.

[0016] In some embodiments, the minimum radial distance between the outer periphery of the inner iron core of the rotor and the edge of the shaft hole is h1 and the maximum distance is h2, and the diameter dimension of the shaft hole is D1, where 0.2 ≤ h1 / D1 ≤ 3; and / or, 0.1 ≤ h1 / (h1 + D1 / 2) ≤ 0.8; and / or, 0.1 ≤ h1 / (h2 + D1 / 2) ≤ 0.8; and / or, 0.1 ≤ h1 / h2 ≤ 0.9.

[0017] The rotor assembly according to an embodiment of the present invention includes: the aforementioned inner iron core of the rotor and a magnetic member, and the magnetic member surrounds the inner iron core of the rotor.

[0018] In some embodiments, the rotor assembly further includes: an outer iron core of the rotor, the outer iron core of the rotor surrounds the inner iron core of the rotor, and the magnetic member is arranged on the outer iron core of the rotor; an injection molded part, and the injection molded part injects and connects the inner iron core of the rotor, the outer iron core of the rotor and the magnetic member into one body.

[0019] In some embodiments, the outer iron core of the rotor is spaced apart from the inner iron core of the rotor; and / or, a notch is provided at the inner edge of the outer iron core of the rotor; and / or, the outer iron core of the rotor is provided with a second injection hole;

[0020] In some embodiments, the minimum radial distance between the outer periphery of the inner iron core of the rotor and the edge of the shaft hole is h1, and the outer diameter dimension of the outer iron core of the rotor is D3, satisfying 0.005 ≤ h1 / D3 ≤ 0.25.

[0021] In some embodiments, the outer iron core of the rotor includes a plurality of sub-outer iron cores distributed around the inner iron core of the rotor, the magnetic member includes a plurality of magnetic tiles, and the magnetic tiles are arranged between adjacent sub-outer iron cores; or, the outer iron core of the rotor is arranged around the inner iron core of the rotor, the magnetic member includes a plurality of magnetic tiles, and the plurality of magnetic tiles are attached to the outer peripheral surface of the outer iron core of the rotor.

[0022] In some embodiments, the plurality of connecting segments include at least two first connecting segments, the at least two first connecting segments are distributed around the shaft hole, and the number of the first connecting segments is the same as the number of the magnetic tiles; or, the at least two first connecting segments correspond to the at least two magnetic tiles respectively, and the first connecting segments and the corresponding magnetic tiles are opposite to each other in the radial direction of the rotor assembly.

[0023] In some embodiments, the magnetic member is injection-molded in the inner iron core of the rotor and constructs a magnetic ring surrounding the inner iron core of the rotor.

[0024] The motor according to an embodiment of the present invention is characterized by comprising the aforementioned inner iron core of the rotor; or, comprising the aforementioned rotor assembly.

[0025] The household appliance according to an embodiment of the present invention is characterized by comprising the aforementioned inner iron core of the rotor; or, comprising the aforementioned rotor assembly; or, comprising the aforementioned motor. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the inner iron core of the rotor according to an embodiment of the present invention.

[0027] Figure 2 It is a schematic diagram of the inner iron core of the rotor according to an embodiment of the present invention.

[0028] Figure 3 It is a schematic diagram of the inner iron core of the rotor according to an embodiment of the present invention.

[0029] Figure 4 It is a schematic diagram of the inner iron core of the rotor according to an embodiment of the present invention.

[0030] Figure 5 It is a schematic diagram of the inner iron core of the rotor according to an embodiment of the present invention.

[0031] Figure 6 It is a schematic diagram of the inner iron core of the rotor according to an embodiment of the present invention.

[0032] Figure 7 It is a schematic diagram of the inner iron core of the rotor according to an embodiment of the present invention.

[0033] Figure 8 It is a schematic diagram of the rotor assembly according to an embodiment of the present invention.

[0034] Figure 9 It is a schematic diagram of the cooperation between the inner iron core of the rotor and the outer iron core of the rotor according to an embodiment of the present invention.

[0035] Figure 10 It is a schematic diagram of the rotor assembly according to an embodiment of the present invention.

[0036] Figure 11 It is a schematic diagram of the rotor assembly according to an embodiment of the present invention.

[0037] Figure 12 It is a schematic diagram of the rotor assembly according to an embodiment of the present invention.

[0038] Reference numerals: Rotor assembly 10, inner rotor iron core 11, first connecting section 101, second connecting section 102, third connecting section 103, shaft hole 1101, outer rotor iron core 12. Detailed implementation mode

[0039] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0040] As Figures 1 to 6 , the present invention provides an inner rotor iron core 11. Among them, the inner rotor iron core 11 has a shaft hole 1101. The inner rotor iron core 11 can be connected with a magnetic member to form a rotor assembly 10, and the rotor assembly 10 is configured to be driven to rotate by a stator assembly. Among them, a rotating shaft can pass through the shaft hole 1101 and be fixedly connected to the inner rotor iron core 11.

[0041] The outer periphery of the inner rotor iron core 11 includes a plurality of connecting sections. The connecting sections extend along the direction around the shaft hole 1101. The plurality of connecting sections are distributed around the shaft hole 1101 and are connected end to end to form a non-circular ring shape. The rotor assembly 10 may further include an injection molding structure (the injection molding structure may be the following injection molded part or injection molded magnetic member). The injection molding structure is connected to the inner rotor iron core 11. Since the outer peripheral surface of the inner rotor iron core 11 is set to be non-circular, stable cooperation between the inner rotor iron core 11 and the injection molding structure can be achieved, and the inner rotor iron core 11 can be restricted from rotating circumferentially relative to the injection molding structure along the inner rotor iron core 11, thereby improving the connection strength and structural stability of the inner rotor iron core 11.

[0042] According to the inner rotor iron core 11 of the embodiment of the present invention, the assembly of the inner rotor iron core 11 and the rotating shaft can be realized by using the shaft hole 1101, and the connection strength and stability of the rotor assembly can be improved by using the non-circular outer periphery of the inner rotor iron core 11, thereby improving the structural strength, stability and service life of the rotor assembly 10. In addition, magnetic leakage can be reduced, the working efficiency and manufacturing efficiency of the motor can be improved, the back electromotive force distortion rate can be reduced, the torque fluctuation can be reduced, and the noise can be improved.

[0043] The plurality of connecting sections in the present invention may include, but are not limited to, the following implementation modes.

[0044] Embodiment 1

[0045] As Figures 1 to 3, the multiple connecting segments include at least one first connecting segment 101, and the first connecting segment 101 is a straight segment. By providing a straight segment, when the inner iron core 11 of the rotor has a tendency to rotate relative to the injection-molded structure, the rotation of the inner iron core 11 of the rotor can be restricted, and the relative position between the inner iron core 11 of the rotor and the magnetic member can be maintained, thereby maintaining the stability of the rotor assembly 10 and the motor. Optionally, the multiple connecting segments include at least two first connecting segments 101, and the at least two first connecting segments 101 can be arranged around the shaft hole 1101 to maintain the uniform stress on the inner iron core 11 of the rotor.

[0046] In addition, the multiple connecting segments construct a non-circular outer peripheral surface of the inner iron core 11 of the rotor, and the following examples may be included but are not limited to.

[0047] Example 1, such as Figures 1 to 3 , the first connecting segment 101 includes at least three, and the at least three first connecting segments 101 are connected end to end around the shaft hole 1101, and the multiple first connecting segments 101 are constructed into a polygon. By connecting at least three first connecting segments 101 into a polygon, it is possible to make each of the multiple first connecting segments 101 play a role in restricting the rotation of the inner iron core 11 of the rotor and improve the stability of the positioning of the inner iron core 11 of the rotor.

[0048] Optionally, the first connecting segment 101 includes at least three that are connected end to end around the shaft hole 1101 to construct a regular polygon centered on the center of the shaft hole 1101. Constructing the multiple first connecting segments 101 into a regular polygon can make the multiple first connecting segments 101 receive uniform stress, avoid stress concentration, and further improve the structural stability of the inner iron core 11 of the rotor.

[0049] Example 2, such as Figure 4 , the multiple connecting segments further include a second connecting segment 102, and the first connecting segment 101 and the second connecting segment 102 are arranged around the shaft hole 1101. Optionally, the first connecting segment 101 includes at least two, the second connecting segment 102 is located between adjacent first connecting segments 101, and the second connecting segment 102 is a straight segment.

[0050] Optionally, the first connecting segment 101 includes at least two, the second connecting segment 102 includes at least two, and the at least two second connecting segments 102 and the at least two first connecting segments 101 are arranged around the shaft hole 1101 in an alternating manner. Among them, the straight lines where the at least two second connecting segments 102 are located enclose a regular polygon centered on the center of the shaft hole 1101; and / or, the straight lines where the at least two first connecting segments 101 are located enclose a regular polygon centered on the center of the shaft hole 1101.

[0051] Optionally, the distance between the second connecting segment 102 and the center of the shaft hole 1101 is not equal to the distance between the first connecting segment 101 and the center of the shaft hole 1101. To further improve the structural strength of the connection between the inner iron core 11 of the rotor and the injection-molded structure and improve the stability of the rotor assembly 10.

[0052] Example 3, such as Figure 5 and Figure 6 , the plurality of connecting segments further includes a third connecting segment 103, and the first connecting segment 101 and the third connecting segment 103 are distributed around the shaft hole 1101. Optionally, the first connecting segment 101 includes at least two, the third connecting segment 103 is located between adjacent first connecting segments 101, and the third connecting segment 103 is an arc segment. Through the combination of the arc segment and the straight segment, the structural strength and stability of the fit between the inner iron core 11 of the rotor and the injection-molded structure are improved, and the smoothness of the inner iron core 11 of the rotor can be facilitated, avoiding problems such as stress concentration.

[0053] Optionally, the third connecting segment 103 includes at least two, the first connecting segment 101 includes at least two, and at least two third connecting segments 103 and at least two first connecting segments 101 are distributed alternately around the shaft hole 1101. Further improve the structural strength and stability of the rotor assembly 10.

[0054] Optionally, the third connecting segment 103 is an arc segment, and the center of the third connecting segment 103 coincides with or is offset from the center of the shaft hole 1101.

[0055] Optionally, the third connecting segment 103 is an arc segment, and the two ends of the third connecting segment 103 are respectively connected to the endpoints of adjacent first connecting segments 101;

[0056] Optionally, the first connecting segment 101 includes at least two, the third connecting segment 103 includes at least two, and at least two third connecting segments 103 and at least two first connecting segments 101 are distributed alternately around the shaft hole 1101 and are connected end to end. The center of the arc segment is the center of the shaft hole 1101, and the radius of the arc segment is the distance between the endpoint of the first connecting segment 101 and the center of the shaft hole 1101.

[0057] In other words, the inner side of the inner iron core 11 of the rotor is the shaft hole 1101, and the outer side is the tangent edge (i.e., the first connecting segment) formed by the tangency of a regular polygon and a circle. The inner iron core 11 of the rotor is evenly distributed with a plurality of tangent edges in the circumferential direction, and the tangent edges are the injection positions.

[0058] In some embodiments, the number N of the first connecting segments 101 satisfies 2 ≤ N ≤ 10. It can conveniently improve the structural strength and stability of the rotor assembly 10, and can maintain the relative positions of the inner iron core 11 of the rotor and the magnetic part. In addition, it can also avoid the excessive number of the first connecting segments 101 from affecting the structural strength and stability of the inner iron core 11 of the rotor. Among them, the number of the first connecting segments 101 in the present utility model can be set to 2, 3, 4, 5, 8, or 10, etc. Preferably, the number of the first connecting segments 101 can be set between 4 and 8.

[0059] In some embodiments, such as Figure 6, the distance between the first connecting section 101 and the edge of the shaft hole 1101 is h1, the length dimension of the first connecting section 101 is w1, and the diameter dimension of the shaft hole 1101 is D1, satisfying 0.1 ≤ w1 / (h1 + D1 / 2) ≤ 2. For example, w1 / (h1 + D1 / 2) can be set to 0.1, 0.2, 0.35, 1.68, 2, etc. It can avoid the first connecting section 101 being too short to affect the stability of the cooperation between the inner iron core 11 of the rotor and the injection molding structure, and can also avoid the minimum distance h1 being too small to affect the structural strength of the inner iron core 11 of the rotor, thereby effectively improving the structural strength of the inner iron core 11 of the rotor and the connection structural strength between the inner iron core 11 of the rotor and the injection molding structure.

[0060] Embodiment 2

[0061] The plurality of connecting sections includes at least one fourth connecting section, and the fourth connecting section is an arc section. By setting the arc section, it is convenient to construct the inner iron core 11 of the rotor into a relatively smooth outer peripheral surface, thereby reducing or avoiding the problem of stress concentration in the inner iron core 11 of the rotor. Optionally, the plurality of connecting sections includes at least two fourth connecting sections, and the at least two fourth connecting sections are distributed around the shaft hole 1101 to maintain the uniform stress of the inner iron core 11 of the rotor.

[0062] In addition, the plurality of connecting sections construct a non-circular outer peripheral surface of the inner iron core 11 of the rotor, which may include but is not limited to the following examples.

[0063] Example 1, the center of the fourth connecting section coincides with the center of the shaft hole 1101, and the center of the fourth connecting section can also be set to be offset from the center of the shaft hole 1101. This is convenient for the production and processing of the inner iron core 11 of the rotor and improves the processing efficiency.

[0064] Optionally, at least two fourth connecting sections are located on the same circumference with the center of the shaft hole 1101 as the center. Thereby further simplifying the structure of the inner iron core 11 of the rotor and facilitating the forming and processing of the inner iron core 11 of the rotor.

[0065] Example 2, the plurality of connecting sections further includes a fifth connecting section, and the fifth connecting section and the fourth connecting section are distributed around the shaft hole 1101. Optionally, the plurality of connecting sections includes at least two fourth connecting sections, and the fifth connecting section is located between adjacent fourth connecting sections, and the fifth connecting section is a straight line section. Through the combination of the arc section and the straight line section, the structural strength and stability of the cooperation between the inner iron core 11 of the rotor and the injection molding structure are improved, and it is convenient for the inner iron core 11 of the rotor to be smooth and avoid problems such as stress concentration.

[0066] Example 3, the plurality of connecting segments further includes a sixth connecting segment, and the sixth connecting segment and the fourth connecting segment are distributed around the shaft hole 1101. Optionally, the plurality of connecting segments includes at least two fourth connecting segments, and the sixth connecting segment is located between adjacent fourth connecting segments, and the sixth connecting segment is an arc segment. Through the combination of different arc segments, it is more capable of meeting the requirements of the cooperation stability between the inner iron core 11 of the rotor and the injection molding structure, and avoiding problems such as stress concentration in the inner iron core 11 of the rotor. Thereby improving the performance of the rotor assembly 10.

[0067] Optionally, the plurality of connecting segments includes at least two fourth connecting segments, the sixth connecting segment includes at least two, and at least two sixth connecting segments and at least two fourth connecting segments are distributed around the shaft hole 1101 in an alternating and end-to-end manner.

[0068] Optionally, the sixth connecting segment is an arc segment, the fourth connecting segment is an arc segment, and the radii of the fifth connecting segment and the fourth connecting segment are different.

[0069] Such as Figures 1 to 7 , in some embodiments, the outer periphery of the inner iron core 11 of the rotor is rotationally symmetric about the center of the shaft hole 1101. Thereby, it is convenient for the processing and manufacturing of the inner iron core 11 of the rotor. In addition, it can also improve the connection strength between the inner iron core 11 of the rotor and the injection molding structure, thereby further improving the structural strength and stability of the rotor assembly 10.

[0070] Such as Figure 7 As shown, the inner iron core 11 of the rotor is provided with a first injection hole 1102, and the first injection hole 1102 is provided on the outer periphery, inner periphery or between the outer periphery and the inner periphery of the inner iron core 11 of the rotor. By providing the first injection hole 1102, the assembly stability and connection strength of the inner iron core 11 of the rotor can be further improved. Among them, after the rotor assembly is manufactured, the injection molding structure penetrates through the first injection hole 1102.

[0071] In some embodiments, such as Figure 6 , the minimum distance between the outer periphery of the inner iron core 11 of the rotor and the edge of the shaft hole 1101 along the radial direction is h1 and the maximum distance is h2, and the diameter dimension of the shaft hole 1101 is D1.

[0072] Optionally, 0.1 ≤ h1 / (h1 + D1 / 2) ≤ 0.8. For example, h1 / (h1 + D1 / 2) can be set to 0.1, 0.2, 0.45, 0.75, 0.8, etc. Optionally, 0.2 ≤ h1 / D1 ≤ 3. For example, h1 / D1 can be set to 0.2, 1.23, 2.25, 2.8, 3, etc. Optionally, 0.1 ≤ h1 / (h2 + D1 / 2) ≤ 0.8; for example, h1 / (h2 + D1 / 2) can be set to 0.1, 0.2, 0.45, 0.75, 0.8, etc. Optionally, 0.1 ≤ h1 / h2 ≤ 0.9. For example, h1 / h2 can be set to 0.1, 0.2, 0.45, 0.75, 0.9, etc. Ensure the structural strength of the inner iron core 11 of the rotor and improve the stability of the cooperation between the inner iron core 11 of the rotor and the injection-molded structure, so as to effectively improve the structural strength and stability of the inner iron core 11 of the rotor.

[0073] As Figures 8 to 12 , the present utility model also provides a rotor assembly 10, including: the aforementioned inner iron core 11 of the rotor and a magnetic member 14, and the magnetic member 14 surrounds the inner iron core 11 of the rotor. Through the aforementioned inner iron core 11 of the rotor, the structural strength and stability of the assembly of the magnetic member 14 and the inner iron core 11 of the rotor can be improved.

[0074] The rotor assembly 10 in the present utility model may include but is not limited to the following embodiments.

[0075] Embodiment 1

[0076] As Figure 8 , the rotor assembly 10 further includes: an outer iron core 12 of the rotor, the outer iron core 12 of the rotor surrounds the inner iron core 11 of the rotor, and the magnetic member 14 is arranged on the outer iron core 12 of the rotor; the rotor assembly 10 further includes: an injection-molded part 13, and the injection-molded part 13 injects and connects the inner iron core 11 of the rotor, the outer iron core 12 of the rotor and the magnetic member 14 into one body. Use the injection-molded part to realize the positioning between the inner iron core 11 of the rotor and the outer iron core 12 of the rotor, improve the structural stability of the rotor assembly 10, and the injection-molded structure in the foregoing embodiment is the injection-molded part 13.

[0077] Combined with the foregoing embodiment, the inner iron core 11 of the rotor is provided with a first injection hole, and the injection-molded part can pass through the first injection hole.

[0078] Optionally, the outer iron core 12 of the rotor is spaced apart from the inner iron core 11 of the rotor to achieve insulation between the inner iron core 11 of the rotor and the outer iron core 12 of the rotor, reduce the shaft voltage, and improve the service life of the motor. Reduce magnetic leakage, improve the motor efficiency, and improve the manufacturing efficiency. Of course, the outer iron core 12 of the rotor and the inner iron core 11 of the rotor can also be connected.

[0079] As Figure 8, a second injection hole is further provided on the outer iron core of the rotor. This can improve the connection strength and stability between the inner iron core of the rotor and the magnetic component. Combining with the foregoing embodiments, the injection molded part can be passed through the second injection hole.

[0080] As Figure 6 and Figure 9 , in some embodiments, the minimum distance along the radial direction between the outer periphery of the inner iron core 11 of the rotor and the edge of the shaft hole 1101 is h1, and the outer diameter dimension of the outer iron core 12 of the rotor is D3, satisfying 0.005 ≤ h1 / D3 ≤ 0.25. For example, h1 / D3 can be set to 0.05, 0.01, 0.13, 0.15 or 0.25, etc. Through the above setting form, the structural strength of the inner iron core 11 of the rotor can be improved, and the connection structural strength between the inner iron core 11 of the rotor and the injection molded part can be improved. In addition, the structural strength and stability of the rotor assembly 10 can also be improved, the magnetic leakage can be reduced, and the performance of the rotor assembly 10 or the motor with the inner iron core 11 of the rotor can be improved.

[0081] Optionally, as Figure 10 , a notch is provided on the inner edge of the outer iron core of the rotor. This is to improve the stability and connection strength of the fit between the injection molded part and the outer iron core of the rotor. Combining with the foregoing embodiments, the injection molded part can be passed through the notch.

[0082] During the manufacturing process of the rotor assembly 10, the rotating shaft 15 can be passed through the shaft hole 1101, and the inner iron core 11 and the outer iron core 12 of the rotor are relatively positioned in the mold. Subsequently, an injection molding material is filled into the mold. The injection molding material will fill the space between the outer iron core 12 and the inner iron core 11 of the rotor and other positions. Among them, the injection molding material enters the first injection hole 1102, and the injection molding material cools to form an injection molded part, realizing the positioning and connection of the rotating shaft 15, the inner iron core 11 of the rotor, and the outer iron core 12 of the rotor.

[0083] Among them, the outer iron core 12 of the rotor can have different structures.

[0084] Example 1, as Figure 8 , the outer iron core 12 of the rotor can include a plurality of sub-outer iron cores distributed around the inner iron core of the rotor, and a groove is formed between adjacent sub-outer iron cores for positioning the magnetic component. Specifically, the magnetic component can include a plurality of magnetic tiles, and the magnetic tiles are arranged between adjacent sub-outer iron cores.

[0085] Example 2, as Figure 10 , the outer iron core 12 of the rotor is arranged around the inner iron core 11 of the rotor, and the magnetic component 14 includes a plurality of magnetic tiles, and the plurality of magnetic tiles are attached to the outer peripheral surface of the outer iron core 12 of the rotor. Among them, the outer iron core 12 of the rotor can be an integral structure or can be set to include a plurality of sub-outer iron cores.

[0086] As Figure 8, in some embodiments, the plurality of connecting segments include at least two first connecting segments 101, the at least two first connecting segments 101 are distributed around the shaft hole 1101, and the number of the first connecting segments 101 is the same as the number of the magnetic tiles; or, the at least two first connecting segments 101 respectively correspond to at least two magnetic tiles, and the first connecting segments 101 and the corresponding magnetic tiles are opposite to each other in the radial direction of the rotor assembly 10.

[0087] Embodiment Two

[0088] As Figure 11 , the magnetic member 14 is injection molded in the inner iron core 11 of the rotor. And the magnetic member 14 constructs a magnetic ring surrounding the inner iron core 11 of the rotor, and the injection molding structure in the foregoing embodiments is the magnetic member 14. Combining the foregoing embodiments, the inner iron core 11 of the rotor is provided with a first injection hole, and the magnetic member 14 can be passed through the first injection hole.

[0089] The present utility model also provides a motor, including the foregoing inner iron core of the rotor or the rotor assembly 10. The present utility model also provides a household appliance, including the foregoing inner iron core 11 of the rotor, the rotor assembly 10 or the motor.

[0090] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 should not be construed as a limitation to the present utility model.

[0091] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0092] In the present utility model, unless otherwise clearly defined or limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication between two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0093] In the present utility model, unless otherwise clearly defined or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0094] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0095] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present utility model.

Claims

1. A rotor inner core, characterized in that: The rotor inner core has an axial hole. The outer circumference of the rotor inner core includes a plurality of connecting segments, which extend in a direction around the axial hole. The plurality of connecting segments are distributed around the axial hole and connected end to end to form a non-circular ring.

2. The rotor inner core according to claim 1, characterized in that: The plurality of connecting segments include at least one first connecting segment, and the first connecting segment is a straight line segment.

3. The rotor inner core according to claim 2, characterized in that: The first connecting section includes at least three sections connected end to end around the shaft hole; Or, the plurality of connecting segments further include a second connecting segment, the first connecting segment and the second connecting segment are distributed around the axial hole, and the second connecting segment is a straight line segment; Alternatively, the plurality of connecting segments further include a third connecting segment, the first connecting segments and the third connecting segments are distributed around the axial hole, and the third connecting segment is located between adjacent first connecting segments, and the third connecting segment is an arc segment.

4. The rotor inner core according to claim 3, characterized in that: The first connecting section includes at least three regular polygons connected end to end around the shaft hole and centered at the center of the shaft hole; Or, the first connecting segments include at least two, the second connecting segments include at least two, the at least two second connecting segments and the at least two first connecting segments are staggered around the shaft hole, and the straight line where the at least two second connecting segments are located surrounds a regular polygon centered at the center of the shaft hole; Or, the distance between the second connecting section and the center of the shaft hole is not equal to the distance between the first connecting section and the center of the shaft hole; Or, the first connecting segments include at least two, the third connecting segments include at least two, and the at least two third connecting segments and the at least two first connecting segments are staggeredly distributed around the shaft hole; Or, the third connecting segment is an arc segment, and the center of the third connecting segment coincides with or is offset from the center of the shaft hole; Or, the third connecting segment is an arc segment, and two ends of the third connecting segment are respectively connected to end points of adjacent first connecting segments; Or, the first connecting segments include at least two, the third connecting segments include at least two, and the at least two third connecting segments and the at least two first connecting segments are staggered around the axial hole and connected end to end, the center of the arc segment is the center of the axial hole, and the radius of the arc segment is the distance between the endpoint of the first connecting segment and the center of the axial hole.

5. The rotor inner core according to claim 2, characterized in that: The number N of the first connecting segments satisfies 2≤N≤10; And / or, the distance h1 between the first connecting section and the edge of the axial hole, the diameter dimension D1 of the axial hole, and the length dimension w1 of the first connecting section satisfy: 0.1≤w1 / (h1+D1 / 2)≤2.

6. The rotor inner core according to claim 1, characterized in that: The plurality of connecting segments include at least one fourth connecting segment, and the fourth connecting segment is an arc segment.

7. The rotor inner core according to claim 6, characterized in that: The center of the fourth connecting section coincides with or is offset from the center of the axial hole; Or, the plurality of connecting segments further include a fifth connecting segment, the fifth connecting segment and the fourth connecting segment are distributed around the axial hole, and the fifth connecting segment is a straight line segment; Alternatively, the plurality of connecting segments further include a sixth connecting segment, the sixth connecting segment and the fourth connecting segment are distributed around the axial hole, and the sixth connecting segment is an arc segment.

8. The rotor inner core according to claim 7, characterized in that: The at least two fourth connecting sections are located on the same circumference with the center of the shaft hole as the center; Or, the sixth connecting segment includes at least two, and the at least two sixth connecting segments and the at least two fourth connecting segments are staggeredly distributed around the shaft hole and connected end to end; Alternatively, the sixth connecting segment is an arc segment, the fourth connecting segment is an arc segment, and the fifth connecting segment and the fourth connecting segment have different radii.

9. The rotor inner core according to any one of claims 1 to 8, characterized in that: The outer periphery of the rotor inner core is rotationally symmetric about the center of the axial hole; and / or the rotor inner core is provided with a first injection hole, which is provided at the outer periphery, the inner periphery or between the outer periphery and the inner periphery of the rotor inner core.

10. The rotor inner core (11) according to any one of claims 1 to 8, characterized in that: The minimum radial distance between the outer periphery of the rotor inner core and the edge of the shaft hole is h1 and the maximum radial distance is h2. The diameter of the shaft hole is D1. Among them, 0.2≤h1 / D1≤3; and / or, 0.1≤h1 / (h1+D1 / 2)≤0.8; and / or, 0.1≤h1 / (h2+D1 / 2)≤0.8; and / or, 0.1≤h1 / h2≤0.

9.

11. A rotor assembly, characterized in that: include: The rotor inner core (11) according to any one of claims 1 to 10; A magnetic member surrounds the rotor inner core.

12. The rotor assembly according to claim 11, characterized in that: The rotor assembly also includes: A rotor outer core, the rotor outer core surrounds the rotor inner core, and the magnetic member is arranged on the rotor outer core; The injection molded part is used to connect the rotor inner core, the rotor outer core and the magnetic part into one piece by injection molding.

13. The rotor assembly according to claim 12, characterized in that: The rotor outer core is spaced apart from the rotor inner core; And / or, a notch is provided on the inner edge of the rotor outer core; And / or, the rotor outer core is provided with a second injection hole; And / or, the minimum radial distance between the outer circumference of the rotor inner core and the edge of the shaft hole is h1, and the outer diameter of the rotor outer core is D3, satisfying 0.005≤h1 / D3≤0.

25.

14. The rotor assembly according to claim 12, characterized in that: The rotor outer core includes a plurality of sub-outer cores distributed around the rotor inner core, and the magnetic component includes a plurality of magnetic tiles, which are arranged between adjacent sub-outer cores; or, the rotor outer core is arranged around the rotor inner core, and the magnetic component includes a plurality of magnetic tiles, which are attached to the outer peripheral surface of the rotor outer core.

15. The rotor assembly according to claim 14, characterized in that: The multiple connecting segments include at least two first connecting segments, and the at least two first connecting segments are distributed around the axial hole, and the number of the first connecting segments is the same as the number of the magnetic tiles; or, the at least two first connecting segments correspond to the at least two magnetic tiles respectively, and the first connecting segments and the corresponding magnetic tiles are opposite to each other along the radial direction of the rotor assembly.

16. The rotor assembly according to claim 11, characterized in that: The magnetic component is injection molded on the rotor inner core and forms a magnetic ring surrounding the rotor inner core.

17. A motor, characterized in that: A rotor inner core (11) comprising any one of claims 1 to 10; or a rotor assembly comprising any one of claims 11 to 16.

18. A household appliance, characterized in that: It comprises the rotor inner core (11) according to any one of claims 1 to 10; or, it comprises the rotor assembly according to claims 11 to 16; or, it comprises the motor according to claim 17.

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