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 and a first injection molding hole, and the periphery of the rotor inner iron core is provided with a groove. According to the rotor inner iron core provided by the embodiment of the utility model, the connection between the rotor inner iron core and the rotating shaft can be realized by using the shaft hole to penetrate through the rotating shaft, and the positioning of the rotor inner iron core can be realized by using the first injection molding hole and the groove.

Description

Technical Field

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

[0002] In a traditional motor, the inner iron core is connected to the outer iron core, and the relative positions of the inner iron core and the outer iron core are fixed. However, shaft voltage will be generated, which will corrode the iron core and reduce the service life of the motor. When the inner iron core is separated from the outer iron core, the relative positions of the inner iron core and the outer iron core are likely to shift. Summary of the Utility Model

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

[0004] The rotor inner iron core according to an embodiment of the utility model includes: the rotor inner iron core has a shaft hole and a first injection hole, and a groove is provided along the outer periphery of the rotor inner iron core.

[0005] The rotor inner iron core according to an embodiment of the utility model can use the shaft hole to pass through the rotating shaft to realize the connection between the rotor inner iron core and the rotating shaft, and can also use the first injection hole and the groove to realize the positioning of the rotor inner iron core.

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

[0007] In some embodiments, the groove and the first injection hole are distributed in a staggered manner around the shaft hole.

[0008] In some embodiments, the outer periphery of the rotor inner iron core includes a plurality of connecting segments, the plurality of connecting segments are distributed around the shaft hole and are connected end to end to form a non-circular ring shape, and the groove is provided on the connecting segment or between adjacent connecting segments.

[0009] In some embodiments, the plurality of connecting segments include a plurality of first connecting segments, the first connecting segments are straight line segments, and the plurality of first connecting segments are connected end to end to form a polygon;

[0010] Or, the plurality of connecting segments include a plurality of first connecting segments and a plurality of second connecting segments, the first connecting segments and the second connecting segments are straight line segments, and the plurality of second connecting segments and the plurality of first connecting segments are distributed around the shaft hole in an alternating manner;

[0011] Or, the plurality of connecting segments further include a plurality of first connecting segments and a plurality of third connecting segments, the first connecting segments and the third connecting segments are straight line segments, and the plurality of third connecting segments and the plurality of first connecting segments are distributed around the shaft hole in an alternating manner.

[0012] In some embodiments, the groove is configured to be circular, oval, polygonal, elongated or irregular in shape; and / or, there are at least two grooves distributed around the shaft hole.

[0013] In some embodiments, the maximum depth of the groove is s1, and the distance D4 between the inner peripheral edge and the outer peripheral edge of the inner iron core of the rotor satisfies: 0.12 ≤ s1 / D4 ≤ 0.85.

[0014] In some embodiments, the first injection hole is provided between the inner peripheral edge and the outer peripheral edge of the inner iron core of the rotor and is spaced apart from the inner peripheral edge and the outer peripheral edge of the inner iron core of the rotor; and / or, the first injection hole is configured to be circular, oval, polygonal, elongated or irregular in shape.

[0015] In some embodiments, the inner iron core of the rotor has at least two of the first injection holes distributed around the shaft hole, and the number n of the first injection holes satisfies 2 ≤ n ≤ 20.

[0016] In some embodiments, in a cross-section perpendicular to the axis of the inner iron core of the rotor, the maximum dimension D1 of the first injection hole along the radial direction of the inner iron core of the rotor

[0017] wherein, the outer diameter D2 of the outer circle of the inner iron core of the rotor satisfies: 0.05 ≤ D1 / D2 ≤ 0.2; and / or, the inner diameter D3 of the inner circle of the shaft hole satisfies: 0.05 ≤ D1 / D3 ≤ 0.5; and / or, the distance D4 between the inner peripheral edge and the outer peripheral edge of the inner iron core of the rotor satisfies: 0.08 ≤ D1 / D4 ≤ 0.45; and / or, the distance D5 between the outer peripheral edge of the inner iron core of the rotor and the first injection hole satisfies: 0.2 ≤ D1 / D5 ≤ 8.

[0018] 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.

[0019] 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 disposed on the outer iron core of the rotor; an injection molded part, the injection molded part integrally injects and connects the inner iron core of the rotor, the outer iron core of the rotor and the magnetic member, and the injection molded part penetrates through the first injection hole.

[0020] In some embodiments, the outer iron core of the rotor is spaced apart from the inner iron core of the rotor; and / or, the outer iron core of the rotor is provided with a second injection hole; and / or, the inner edge of the outer iron core of the rotor is provided with a notch; and / or, in a cross-section perpendicular to the axis of the inner iron core of the rotor, the maximum dimension D1 of the first injection hole along the radial direction of the inner iron core of the rotor, the outer diameter D6 of the outer circle of the outer iron core of the rotor satisfies: 0.01 ≤ D1 / D6 ≤ 0.1.

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

[0022] In some embodiments, the magnetic members are injection-molded on the inner rotor iron core and pass through the first injection holes.

[0023] The motor according to an embodiment of the present invention includes the aforementioned inner rotor iron core; or includes the aforementioned rotor assembly.

[0024] The household appliance according to an embodiment of the present invention includes the aforementioned inner rotor iron core; or includes the aforementioned rotor assembly; or includes the aforementioned motor. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of the inner rotor iron core according to an embodiment of the present invention.

[0026] Figure 2 It is a schematic diagram of the inner rotor iron core according to an embodiment of the present invention.

[0027] Figure 3 It is a schematic diagram of the inner rotor iron core according to an embodiment of the present invention.

[0028] Figure 4 It is a schematic diagram of the inner rotor iron core according to an embodiment of the present invention.

[0029] Figure 5 It is a schematic diagram of the inner rotor iron core according to an embodiment of the present invention.

[0030] Figure 6 It is a schematic diagram of the inner rotor iron core according to an embodiment of the present invention.

[0031] Figure 7 It is a schematic diagram of the inner rotor iron core according to an embodiment of the present invention.

[0032] Figure 8 It is a schematic diagram of the inner rotor iron core according to an embodiment of the present invention.

[0033] Figure 9 It is a schematic diagram of the inner rotor iron core according to an embodiment of the present invention.

[0034] Figure 10 It is a schematic diagram of the inner rotor iron core according to an embodiment of the present invention.

[0035] Figure 11Schematic diagram of the inner iron core of the rotor according to an embodiment of the present utility model.

[0036] Figure 12 Schematic diagram of the rotor assembly according to an embodiment of the present utility model.

[0037] Figure 13 Schematic diagram of the cooperation between the inner iron core and the outer iron core of the rotor according to an embodiment of the present utility model.

[0038] Figure 14 Schematic diagram of the rotor assembly according to an embodiment of the present utility model.

[0039] Figure 15 Schematic diagram of the rotor assembly according to an embodiment of the present utility model.

[0040] Figure 16 Schematic diagram of the rotor assembly according to an embodiment of the present utility model.

[0041] Figure 17 Schematic diagram of the rotor assembly according to an embodiment of the present utility model.

[0042] Figure 18 Schematic diagram of the rotor assembly according to an embodiment of the present utility model.

[0043] Figure 19 Schematic diagram of the rotor assembly according to an embodiment of the present utility model.

[0044] Figure 20 Schematic diagram of the rotor assembly according to an embodiment of the present utility model.

[0045] Reference numerals: rotor assembly 10, inner iron core of the rotor 11, shaft hole 1101, first injection hole 1102, groove 1103, outer iron core of the rotor 12, second injection hole 1201, magnetic part 14, injection molded part 13. Detailed implementation manners

[0046] The embodiments of the present utility model 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 from beginning to end. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0047] As Figures 1 to 11, the present utility model provides a rotor inner iron core 11, which has a shaft hole 1101 and a first injection hole 1102, and a groove 1103 is provided along the outer periphery of the rotor inner iron core 11. The rotor inner iron core 11 can be connected to a magnetic member to form a rotor assembly 10, and the rotor assembly 10 is arranged to be driven by a stator assembly to rotate. Among them, a rotating shaft can pass through the shaft hole 1101 and be fixedly connected to the rotor inner iron core 11; the rotor assembly 10 can further include an injection molding structure, and the injection molding structure is connected to the rotor inner iron core 11. The injection molding structure can pass through the first injection hole 1102 and the groove 1103 to realize the stable connection between the injection molded part and the rotor inner iron core 11, and can also improve the connection strength and stability of the rotor assembly 10.

[0048] According to the rotor inner iron core 11 of the embodiment of the present utility model, the assembly of the rotor inner 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 10 can be improved by using the first injection hole 1102 and the groove 1103, so as to improve the structural strength, stability and service life of the rotor assembly. 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.

[0049] Such as Figures 1 to 11 , in some embodiments, the groove 1103 and the first injection hole 1102 are distributed in a staggered manner around the shaft hole 1101. In this way, it is possible to avoid the local width of the rotor inner iron core 11 being too small and affecting the structural strength of the rotor inner iron core 11, and moreover, the structural strength and stability of the rotor inner iron core 11 after assembly can be further improved.

[0050] In addition, the groove 1103 can also be set to include at least two distributed around the shaft hole 1101. In addition, the groove 1103 can be set to be circular, elliptical, polygonal, strip-shaped, irregular, semi-circular, polygonal or semi-elliptical, etc. Injection molded parts are respectively passed through the plurality of grooves 1103, so that the displacement of the rotor inner iron core 11 caused by the manufacturing error of a single groove 1103 can be avoided, the stability and connection strength of the rotor inner iron core 11 can be effectively improved, and the relative position between the rotor inner iron core 11 and the magnetic member can be maintained, and the structural stability of the rotor assembly can be optimized.

[0051] In addition, the aforementioned at least two grooves 1103 are distributed around the shaft hole 1101. The stability and structural strength of the rotor inner iron core 11 can be further improved. In addition, the aforementioned groove 1103 can also be arranged along the radial direction of the shaft hole 1101.

[0052] Such as Figures 2 to 4, in some embodiments, the outer peripheral edge of the inner iron core 11 of the rotor includes a plurality of connecting segments, and the plurality of connecting segments are distributed around the shaft hole 1101 and are connected end to end to form a non-circular ring shape. The shaft hole 1101 can be used to assemble the inner iron core 11 of the rotor with the rotating shaft 30, and the non-circular outer peripheral edge of the inner iron core 11 of the rotor can be used to improve the connection strength and stability of the rotor assembly, thereby improving the structural strength, stability and service life of the rotor assembly 100. In addition, magnetic leakage can be reduced, and the working efficiency and manufacturing efficiency of the motor can be improved.

[0053] For example Figure 2 , in some examples, the plurality of connecting segments include a plurality of first connecting segments 101, the first connecting segments 101 are straight line segments, and the plurality of first connecting segments 101 are connected end to end to form a polygon.

[0054] For example Figure 3 , in other examples, the plurality of connecting segments include a plurality of first connecting segments 101 and a plurality of second connecting segments 102, the first connecting segments 101 and the second connecting segments 102 are straight line segments, and the plurality of second connecting segments 102 and the plurality of first connecting segments 101 are distributed alternately around the shaft hole 1101.

[0055] For example Figure 4 , in some examples, the plurality of connecting segments further include a plurality of first connecting segments 101 and a plurality of third connecting segments 103, the first connecting segments 101 are straight line segments, the third connecting segments 103 are arc line segments, and the plurality of third connecting segments 103 and the plurality of first connecting segments 101 are distributed alternately around the shaft hole 1101.

[0056] In addition, for example Figures 2 to 4 , in some embodiments of the present invention, a groove 1103 can be provided between the aforementioned connecting segments or adjacent connecting segments.

[0057] For example Figure 1 , the maximum depth of the groove 1103 is s1, and the distance D4 between the inner peripheral edge and the outer peripheral edge of the inner iron core 11 of the rotor satisfies: 0.12 ≤ s1 / D4 ≤ 0.85. Among them, the ratio s1 / D4 can be set to 0.12, 0.36, 0.59, 0.6, 0.8 or 0.85, etc., which can limit the depth dimension of the groove 1103, avoid the depth dimension of the groove 1103 being too large and affecting the structural strength of the inner iron core 11 of the rotor, and can also avoid the depth dimension of the groove 1103 being too small, resulting in difficulty for the injection medium to enter the groove 1103. Thereby, the structural strength and stability of the inner iron core 11 of the rotor can be effectively improved.

[0058] For example Figures 1 to 11, in some embodiments, the first injection hole 1102 is provided between the inner peripheral edge and the outer peripheral edge of the inner iron core 11 of the rotor, and is spaced apart from the inner peripheral edge and the outer peripheral edge of the inner iron core 11 of the rotor. Compared with arranging the first injection hole 1102 on the inner peripheral edge and the outer peripheral edge of the inner iron core 11 of the rotor, the present utility model arranges the first injection hole 1102 between the inner peripheral edge and the outer peripheral edge of the inner iron core 11 of the rotor, which can avoid the slippage between the injection molded part and the inner iron core 11 of the rotor during the high-speed rotation of the rotor assembly, and further improve the connection strength and stability of the rotor assembly.

[0059] Of course, the first injection hole 1102 can also be arranged on the inner peripheral edge and the outer peripheral edge of the inner iron core 11 of the rotor.

[0060] Among them, the first injection hole 1102 is configured to be circular, which can facilitate the stable cooperation between the injection medium in the first injection hole 1102 and the inner iron core 11 of the rotor, and improve the structural strength and connection stability of the rotor assembly. In addition, the circular first injection hole 1102 can optimize the structural strength of the inner iron core 11 of the rotor and avoid the problem of local stress concentration in the inner iron core 11 of the rotor. In addition, the first injection in the present utility model can also be set to an oval shape, a polygon, a long strip shape or an irregular shape, etc.

[0061] Such as Figure 6 , in some embodiments, in the cross-section perpendicular to the axis of the inner iron core 11 of the rotor, the maximum dimension of the first injection hole 1102 along the radial direction of the inner iron core 11 of the rotor is D1,

[0062] Among them, the outer diameter D2 of the inner iron core 11 of the rotor satisfies: 0.05 ≤ D1 / D2 ≤ 0.2. For example, D1 / D2 can be set to 0.05, 0.1, 0.15, 0.18 or 0.2, etc.; and / or, the inner diameter D3 of the shaft hole 1101 satisfies: 0.05 ≤ D1 / D3 ≤ 0.5. For example, D1 / D3 can be set to 0.05, 0.1, 0.15, 0.18, 0.2, 0.35 or 0.5, etc. The radial dimension of the first injection hole 1102 can be limited to avoid the influence on the structural strength of the inner iron core 11 of the rotor due to the too large radial dimension of the first injection hole 1102, and it can also avoid the too small radial dimension of the first injection hole 1102, resulting in the difficulty of the injection medium entering the first injection hole 1102. Thus, the structural strength and stability of the inner iron core 11 of the rotor can be effectively improved.

[0063] Optionally, the distance D4 between the inner peripheral edge and the outer peripheral edge of the inner iron core 11 of the rotor may satisfy: 0.08 ≤ D1 / D4 ≤ 0.45. For example, D1 / D4 may be set to 0.08, 0.1, 0.15, 0.25, 0.35, 0.4, or 0.5, etc. Optionally, the distance D5 between the outer peripheral edge of the inner iron core 11 of the rotor and the first injection hole 1102 satisfies: 0.2 ≤ D1 / D5 ≤ 8. For example, D1 / D5 may be set to 0.2, 0.5, 1.25, 3.47, 5.58, 7.75, or 8, 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 can also be improved, the magnetic leakage can be reduced, and the performance of the rotor assembly or the motor with the inner iron core 11 of the rotor can be improved.

[0064] In some embodiments, the inner iron core 11 of the rotor has at least two first injection holes 1102. After the injection molding of the rotor assembly is completed, injection molding media are respectively disposed in the plurality of first injection holes 1102, so as to avoid the displacement of the inner iron core 11 of the rotor caused by the manufacturing error of a single first injection hole 1102, effectively improve the stability and connection strength of the inner iron core 11 of the rotor, and maintain the relative positions of the components of the rotor assembly, and optimize the structural stability of the rotor assembly.

[0065] In addition, the foregoing at least two first injection holes 1102 are distributed around the shaft hole 1101. The stability and structural strength of the inner iron core 11 of the rotor can be further improved. In addition, the foregoing first injection holes 1102 may also be arranged radially along the shaft hole 1101.

[0066] In some embodiments, the number n of the first injection holes 1102 satisfies 2 ≤ n ≤ 20. It is convenient to use the first injection to improve the structural strength and stability of the rotor assembly, and maintain the relative positions of the parts of the rotor assembly. In addition, it can also avoid the excessive number of the first injection holes 1102 from affecting the structural strength and stability of the inner iron core 11 of the rotor. Among them, the number of the first injection holes 1102 in the present invention can be set to 2, 3, 4, 5, 8, 10, 12, or 20, etc. Preferably, the number of the first injection holes 1102 can be set between 4 and 12.

[0067] In addition, at least two first injection holes 1102 are evenly spaced around the shaft hole 1101. For example, as Figure 5 shown, the inner iron core 11 of the rotor is provided with four circular first injection holes 1102 evenly spaced in the circumferential direction; as Figure 6 shown, the inner iron core 11 of the rotor is provided with six circular first injection holes 1102 evenly spaced in the circumferential direction; as Figure 7As shown, ten circular first injection holes 1102 are arranged at equal intervals along the circumferential direction of the inner iron core 11 of the rotor; as Figure 8 As shown, ten square first injection holes 1102 are arranged at equal intervals along the circumferential direction of the inner iron core 11 of the rotor; as Figure 9 As shown, ten hexagonal first injection holes 1102 are arranged at equal intervals along the circumferential direction of the inner iron core 11 of the rotor; as Figure 10 As shown, ten triangular first injection holes 1102 are arranged at equal intervals along the circumferential direction of the inner iron core 11 of the rotor; as Figure 11 As shown, four strip-shaped first injection holes 1102 are arranged at equal intervals along the circumferential direction of the inner iron core 11 of the rotor. Of course, the above embodiments are only some examples of the present invention and do not limit the protection scope of the present invention. Through the above settings, the inner iron core 11 of the rotor in the present invention can not only avoid the problem of relative position deviation between the inner rotor of the iron core and the outer rotor of the iron core due to the processing error of the first injection hole 1102, improve the relative position between the inner rotor of the iron core and the outer rotor of the iron core, but also maintain the position of the inner iron core 11 of the rotor by using the uniformly arranged first injection holes 1102, and improve the performance of the motor with the inner iron core 11 of the rotor.

[0068] In some embodiments, the shaft hole 1101 penetrates the inner iron core 11 of the rotor along the axial direction; and / or, the first injection hole 1102 penetrates the inner iron core 11 of the rotor along the axial direction. Thereby improving the connection strength and stability between the rotating shaft and the inner iron core 11 of the rotor, as well as the rotor assembly. Of course, the shaft hole 1101 in the present invention can also be set not to penetrate the inner iron core 11 of the rotor, that is, one end of the shaft hole 1101 is provided at one end face of the inner iron core 11 of the rotor, and the other end of the shaft hole 1101 is spaced apart from the end face of the other end of the inner iron core 11 of the rotor. In addition, the first injection hole 1102 can also be set not to penetrate the inner iron core 11 of the rotor.

[0069] As Figures 12 to 20 , the present invention 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.

[0070] The rotor assembly in the present invention may include but is not limited to the following embodiments.

[0071] Embodiment 1

[0072] As Figures 14 to 16, the rotor assembly further includes: a rotor outer iron core 12, the rotor outer iron core 12 surrounds the rotor inner iron core 11, and the magnetic member 14 is disposed on the rotor outer iron core 12; the rotor assembly further includes: an injection molded part 13, the injection molded part 13 integrally injects and connects the rotor inner iron core 11, the rotor outer iron core 12 and the magnetic member 14, and the injection molded part 13 passes through the first injection hole 1102. The injection molded part is used to realize the positioning between the rotor inner iron core 11 and the rotor outer iron core 12, and improve the structural stability of the rotor assembly 10.

[0073] Optionally, the rotor outer iron core 12 is spaced apart from the rotor inner iron core 11 to achieve insulation between the rotor inner iron core 11 and the rotor outer iron core 12, reduce the shaft voltage, and improve the motor life. Reduce magnetic leakage, improve motor efficiency, and improve manufacturing efficiency. Of course, the rotor outer iron core 12 and the rotor inner iron core 11 can also be connected.

[0074] In addition, as Figure 12 , the rotor outer iron core 12 is provided with a second injection hole 1201. The rotor inner iron core 11 and the rotor outer iron core 12 can be injection molded into one body, and the injection molded part passes through the first injection hole 1102 and the second injection hole 1201 respectively, which can maintain the connection structure strength between the rotor inner iron core 11 and the rotor outer iron core 12, and can also maintain the relative position of the rotor inner iron core 11 and the rotor outer iron core 12, and optimize the structural stability of the rotor assembly 10.

[0075] Combined with Figure 6 , Figure 12 and Figure 13 , the maximum dimension of the first injection hole 1102 along the radial direction of the rotor inner iron core 11 is D1, and the outer diameter of the rotor outer iron core 12 is D6, satisfying: 0.01 ≤ D1 / D6 ≤ 0.1. For example, D1 / D6 can be set to 0.01, 0.015, 0.035, 0.05, 0.08, 0.085 or 0.1, etc. Through the above setting form, the structural strength of the rotor inner iron core 11 can be improved, and the connection structure strength between the rotor inner iron core 11 and the injection molded part can be improved. In addition, the structural strength and stability of the rotor assembly 10 can be improved, magnetic leakage can be reduced, and the performance of the rotor assembly or the motor with the rotor inner iron core 11 can be improved.

[0076] Optionally, the inner edge of the rotor outer iron core is provided with a notch. To improve the stability and connection strength of the cooperation between the injection molded part and the rotor outer iron core.

[0077] During the manufacturing process of the rotor assembly 10, the rotating shaft 15 can be passed through the shaft hole 1101, and the inner rotor iron core 11 and the outer rotor iron core 12 can be 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 rotor iron core 12 and the inner rotor iron core 11 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 rotor iron core 11, and the outer rotor iron core 12.

[0078] The injection molded part 13 integrally injects and connects the inner rotor iron core 11 and the magnetic part 14, and the injection molded part passes through the first injection hole 1102. The shaft hole 1101 can be used to assemble the inner rotor iron core 11 and the rotating shaft 15, and the first injection hole 1102 can be used to improve the stability of the connection strength between the inner rotor iron core 11, the outer rotor iron core 12, and the rotating shaft 15, thereby improving 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. The inner rotor iron core 11 and the outer rotor iron core 12 are separated to achieve an insulating effect, reduce the shaft voltage, and increase the motor life. In addition, magnetic leakage is reduced, motor efficiency is improved, and manufacturing efficiency is increased.

[0079] Among them, the outer rotor iron core 12 can have different structures.

[0080] Example 1, such as Figure 12 The outer rotor iron core 12 can include a plurality of sub-outer iron cores distributed around the inner rotor iron core, and a groove is formed between adjacent sub-outer iron cores for positioning the magnetic part. Specifically, the magnetic part can include a plurality of magnetic tiles, and the magnetic tiles are arranged between adjacent sub-outer iron cores.

[0081] Example 2, such as Figures 14 to 16 , the outer rotor iron core 12 is arranged around the inner rotor iron core 11, and the magnetic part 14 includes a plurality of magnetic tiles, and the plurality of magnetic tiles are attached to the outer peripheral surface of the outer rotor iron core 12. Among them, the outer rotor iron core 12 can be an integral structure or can be set to include a plurality of sub-outer iron cores.

[0082] Embodiment 2

[0083] Such as Figures 17 to 19 , the magnetic part 14 is injection molded on the inner rotor iron core 11 and passes through the first injection hole 1102. The magnetic part 14 constructs a magnetic ring around the inner rotor iron core.

[0084] The present utility model also provides a motor, including the aforementioned inner rotor iron core 11 or rotor assembly. The present utility model also provides a household appliance, including the aforementioned inner rotor iron core 11, rotor assembly, or motor.

[0085] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0086] In the present utility model, unless otherwise clearly specified and defined, terms such as "installed", "connected", "connected to", "fixed" and the like shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, 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.

[0087] In the present utility model, unless otherwise clearly specified and defined, 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 be 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", "below" and "beneath" 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.

[0088] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 representations 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.

[0089] 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 iron core (11), characterized in that, Comprising: The inner iron core (11) of the rotor has a shaft hole (1101) and a first injection hole (1102), and a groove (1103) is provided along the outer periphery of the inner iron core (11) of the rotor.

2. The inner iron core (11) of the rotor according to claim 1, characterized in that, The groove (1103) and the first injection hole (1102) are distributed in a staggered manner around the shaft hole (1101).

3. The inner iron core (11) of the rotor according to claim 1, characterized in that, The outer periphery of the inner iron core (11) of the rotor includes a plurality of connecting segments, the plurality of connecting segments are distributed around the shaft hole (1101) and are connected end to end to form a non-circular ring shape, and the groove is provided on the connecting segment or between adjacent connecting segments.

4. The inner iron core (11) of the rotor according to claim 3, characterized in that, The plurality of connecting segments include a plurality of first connecting segments (101), the first connecting segments (101) are straight line segments, and the plurality of first connecting segments (101) are connected end to end to form a polygon; Or, the plurality of connecting segments include a plurality of first connecting segments (101) and a plurality of second connecting segments (102), the first connecting segments (101) and the second connecting segments (102) are straight line segments, and the plurality of second connecting segments (102) and the plurality of first connecting segments (101) are distributed in a staggered manner around the shaft hole (1101); Or, the plurality of connecting segments further include a plurality of first connecting segments (101) and a plurality of third connecting segments (103), the first connecting segments (101) and the third connecting segments (103) are straight line segments, and the plurality of third connecting segments (103) and the plurality of first connecting segments (101) are distributed in a staggered manner around the shaft hole (1101).

5. The inner iron core (11) of the rotor according to claim 1, characterized in that, The groove (1103) is configured to be circular, elliptical, polygonal or strip-shaped; and / or, the groove (1103) includes at least two distributed around the shaft hole (1101).

6. The inner iron core (11) of the rotor according to claim 1, characterized in that The maximum depth of the groove (1103) is s1, and the distance D4 between the inner periphery and the outer periphery of the inner iron core (11) of the rotor satisfies: 0.12 ≤ s1 / D4 ≤ 0.

85.

7. The inner iron core (11) of the rotor according to claim 1, characterized in that, The first injection hole (1102) is provided between the inner periphery and the outer periphery of the inner iron core (11) of the rotor and is spaced apart from the inner periphery and the outer periphery of the inner iron core (11); and / or, the first injection hole (1102) is configured to be circular, elliptical, polygonal or strip-shaped.

8. The inner iron core (11) of the rotor according to claim 1, characterized in that, The inner iron core (11) of the rotor has at least two of the first injection holes (1102) distributed around the shaft hole (1101); or, the number n of the first injection holes (1102) satisfies 2 ≤ n ≤ 20.

9. The inner iron core (11) of the rotor according to claim 1, wherein Among them, The outer diameter D2 of the inner iron core (11) of the rotor satisfies: 0.05 ≤ D1 / D2 ≤ 0.2; and / or, the inner diameter D3 of the shaft hole (1101) satisfies: 0.05 ≤ D1 / D3 ≤ 0.5; and / or, the distance D4 between the inner periphery and the outer periphery of the inner iron core (11) of the rotor satisfies: 0.08 ≤ D1 / D4 ≤ 0.45; and / or, the distance D5 between the outer periphery of the inner iron core (11) of the rotor and the first injection hole (1102) satisfies: 0.2 ≤ D1 / D5 ≤ 8.

10. A rotor assembly, characterized in that, Comprising: The inner rotor iron core (11) according to any one of claims 1-9; A magnetic member (14), the magnetic member (14) surrounding the inner rotor iron core (11).

11. The rotor assembly according to claim 10, characterized in that, The rotor assembly further includes: An outer rotor iron core (12), the outer rotor iron core (12) surrounding the inner rotor iron core (11), and the magnetic member (14) is disposed on the outer rotor iron core (12); An injection molded part, which integrally injection-molds the inner rotor iron core (11), the outer rotor iron core (12) and the magnetic member (14) together, and the injection molded part penetrates through the first injection hole (1102).

12. The rotor assembly according to claim 11, wherein, The outer rotor iron core (12) is spaced apart from the inner rotor iron core (11); And / or, the outer rotor iron core (12) is provided with a second injection hole (1201); And / or, the inner edge of the outer rotor iron core (12) is provided with a notch; And / or, in a cross-section perpendicular to the axis of the inner rotor iron core (11), the maximum dimension of the first injection hole (1102) along the radial direction of the inner rotor iron core (11) is D1, and the outer diameter D6 of the outer rotor iron core (12) satisfies: 0.01 ≤ D1 / D6 ≤ 0.

1.

13. The rotor assembly according to claim 11, characterized in that, The outer rotor iron core (12) includes a plurality of sub-outer iron cores distributed around the inner rotor iron core (11), the magnetic member (14) includes a plurality of magnetic tiles, and the magnetic tiles are disposed between adjacent sub-outer iron cores; or, the outer rotor iron core (12) is arranged around the inner rotor iron core (11), the magnetic member (14) includes a plurality of magnetic tiles, and the plurality of magnetic tiles are attached to the outer peripheral surface of the outer rotor iron core (12).

14. The rotor assembly according to claim 10, wherein, The magnetic member (14) is injection molded on the inner rotor iron core (11) and constructs a magnetic ring surrounding the inner rotor iron core, and the magnetic member (14) penetrates through the first injection hole (1102).

15. A motor, characterized in that, Including the inner rotor iron core (11) according to any one of claims 1-9; or, including the rotor assembly according to any one of claims 10-14.

16. A household appliance, characterized in that, Including the inner rotor iron core (11) according to any one of claims 1-9; or, including the rotor assembly according to claims 10-14; or, including the motor according to claim 15.

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