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 first injection molding hole is communicated with the shaft hole. 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.

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, 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 an inner iron core of a rotor, a rotor assembly, a motor and a household appliance.

[0004] The inner iron core of the rotor according to an embodiment of the utility model is characterized by comprising: the inner iron core of the rotor has a shaft hole and a first injection hole, and the first injection hole communicates with the shaft hole.

[0005] The inner iron core of the rotor 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 inner iron core of the rotor and the rotating shaft, and can also use the first injection hole to position the inner iron core of the rotor.

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

[0007] In some embodiments, the first injection hole is provided on the inner circumferential edge of the inner iron core of the rotor and is spaced apart from the outer circumferential edge of the inner iron core of the rotor.

[0008] In some embodiments, the first injection hole is provided between the inner circumferential edge and the outer circumferential edge of the inner iron core of the rotor, and the inner iron core of the rotor is provided with a channel communicating the first injection hole and the shaft hole.

[0009] In some embodiments, the inner iron core of the rotor includes at least two connecting portions and at least two convex portions, the at least two connecting portions and the at least two convex portions are distributed alternately around the shaft hole, and the convex portions protrude from the outer peripheral surface of the connecting portions.

[0010] In some embodiments, the first injection hole is provided on the convex portion.

[0011] In some embodiments, the first injection hole is configured to be circular, elliptical, polygonal, strip-shaped or irregular; or, the first injection hole is configured to be a dovetail tooth-shaped structure that becomes narrower or wider radially outward along the inner iron core of the rotor.

[0012] In some embodiments, a groove is provided on the outer circumferential edge of the inner iron core of the rotor.

[0013] In some embodiments, the groove and the first injection hole are distributed offset around the shaft hole; and / or, the groove includes at least two distributed around the shaft hole; and / or, the groove is configured to be circular, elliptical, polygonal, strip-shaped or irregular in shape.

[0014] In some embodiments, the inner core of the rotor is further provided with a second injection hole, which is arranged between the outer peripheral edges of the inner core of the rotor and is spaced apart from the outer peripheral edges of the inner core of the rotor.

[0015] In some embodiments, the second injection hole and the first injection hole are distributed offset around the shaft hole; and / or, the second injection hole includes at least two distributed around the shaft hole.

[0016] In some embodiments, the dimension L1 of the first injection hole along the radial direction of the inner core of the rotor and the outer diameter dimension D2 of the inner core of the rotor satisfy: 0.05 ≤ L1 / D2 ≤ 0.4;

[0017] and / or, the dimension L1 of the first injection hole along the radial direction of the inner core of the rotor and the inner diameter dimension D3 of the inner core of the rotor satisfy 0.1 ≤ L1 / D3 ≤ 1.5;

[0018] and / or, the dimension L1 of the first injection hole along the radial direction of the inner core of the rotor and the distance L4 between the inner and outer peripheral edges of the inner core of the rotor satisfy 0.1 ≤ L1 / L4 ≤ 0.8;

[0019] and / or, the first injection hole and the outer peripheral edge of the inner core of the rotor have a distance L5 along the radial direction of the inner core of the rotor, and the dimension L1 of the first injection hole along the radial direction of the inner core of the rotor and the distance L5 satisfy: 0.5 ≤ L1 / L5 ≤ 5;

[0020] and / or, the width dimension W1 of the first injection hole and the outer diameter dimension D2 of the inner core of the rotor satisfy: 0.05 ≤ W1 / D2 ≤ 0.45.

[0021] In some embodiments, the inner core of the rotor has at least two of the first injection holes distributed around the shaft hole; or, the number n of the first injection holes satisfies 2 ≤ n ≤ 20.

[0022] The rotor assembly according to the embodiment of the present invention includes: the aforementioned inner core of the rotor; a magnetic member, the magnetic member surrounding the inner core of the rotor.

[0023] In some embodiments, the rotor assembly further includes: a rotor outer iron core that surrounds the rotor inner iron core, with the magnetic member disposed on the rotor outer iron core; an injection molded part that integrally injection-molds the rotor inner iron core, the rotor outer iron core, and the magnetic member, and the injection molded part passes through the first injection hole.

[0024] In some embodiments, the rotor outer iron core is spaced apart from the rotor inner iron core; alternatively, the rotor outer iron core is provided with a third injection hole;

[0025] And / or, the outer diameter dimension of the rotor outer iron core is D6, and the dimension L1 of the first injection hole along the radial direction of the rotor inner iron core satisfies: 0.005 ≤ L1 / D6 ≤ 0.25.

[0026] In some embodiments, the rotor outer iron core includes a plurality of sub-outer iron cores distributed around the rotor inner iron core, the magnetic member includes a plurality of magnetic tiles, and the magnetic tiles are disposed between adjacent sub-outer iron cores; the rotor outer iron core is arranged around the rotor inner iron core, the magnetic member includes a plurality of magnetic tiles, and the plurality of magnetic tiles are attached to the outer peripheral surface of the rotor outer iron core.

[0027] In some embodiments, the magnetic member is injection molded on the rotor inner iron core and forms a magnetic ring surrounding the rotor inner iron core, and the magnetic member passes through the first injection hole.

[0028] The motor according to an embodiment of the present invention includes the aforementioned rotor inner iron core; or, includes the aforementioned rotor assembly.

[0029] The household appliance according to an embodiment of the present invention includes the aforementioned rotor inner iron core; or, includes the aforementioned rotor assembly; or, includes the aforementioned motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of a rotor inner iron core according to an embodiment of the present invention.

[0031] Figure 2 is a schematic diagram of a rotor inner iron core according to an embodiment of the present invention.

[0032] Figure 3 is a schematic diagram of a rotor inner iron core according to an embodiment of the present invention.

[0033] Figure 4 is a schematic diagram of a rotor inner iron core according to an embodiment of the present invention.

[0034] Figure 5 is a schematic diagram of a rotor inner iron core according to an embodiment of the present invention.

[0035] Figure 6It is a schematic diagram of the inner iron core of the rotor according to an embodiment of the present utility model.

[0036] Figure 7 It is a schematic diagram of the inner iron core of the rotor according to an embodiment of the present utility model.

[0037] Figure 8 It is a schematic diagram of the inner iron core of the rotor according to an embodiment of the present utility model.

[0038] Figure 9 It is a schematic diagram of the inner iron core of the rotor according to an embodiment of the present utility model.

[0039] Figure 10 It is a schematic diagram of the inner iron core of the rotor according to an embodiment of the present utility model.

[0040] Figure 11 It is a schematic diagram of the rotor assembly according to an embodiment of the present utility model.

[0041] Figure 12 It is a schematic diagram of the rotor assembly according to an embodiment of the present utility model.

[0042] Figure 13 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 utility model.

[0043] Figure 14 It is a schematic diagram of the rotor assembly according to an embodiment of the present utility model.

[0044] Figure 15 It is a schematic diagram of the rotor assembly according to an embodiment of the present utility model.

[0045] Figure 16 It is a schematic diagram of the rotor assembly according to an embodiment of the present utility model.

[0046] 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, third injection hole 1201. Detailed implementation manners

[0047] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals indicate 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 utility model, and should not be construed as a limitation of the present utility model.

[0048] As Figures 1 to 10, the present utility model provides a rotor inner iron core 11, which has a shaft hole 1101 and a first injection hole 1102. The rotor inner iron core 11 can be assembled with a magnetic member to form a rotor assembly, and the rotor assembly is configured 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 injection structure can pass through the first injection hole 1102 to achieve a stable connection between the injection structure and the rotor inner iron core 11, and can also improve the connection strength and stability between the rotor inner iron core 11 and the magnetic member. In addition, the first injection hole 1102 communicates with the shaft hole 1101, which can improve the connection strength and stability between the rotating shaft and the rotor inner iron core 11.

[0049] According to the rotor inner iron core 11 of the embodiment of the present utility model, the stable connection between the rotor inner iron core 11 and the rotating shaft can be achieved by using the shaft hole 1101, and the connection strength and stability of the rotor assembly can be improved by using the first injection hole 1102, thereby improving the service life of the rotor assembly, and improving the stability and structural strength of the rotor assembly. In addition, the back electromotive force distortion rate can be reduced, the torque fluctuation can be reduced, the noise can be improved, the magnetic leakage can be reduced, and the working efficiency and manufacturing efficiency of the motor can be improved.

[0050] Such as Figures 1 to 10 , in some embodiments, the first injection hole 1102 is provided on the inner peripheral edge of the rotor inner iron core 11 and is spaced apart from the outer peripheral edge of the rotor inner iron core 11. It can prevent the injection structure from slipping off the rotor inner iron core 11 during the high-speed rotation of the rotor assembly, and further improve the connection strength and stability of the rotor assembly.

[0051] Of course, the first injection hole 1102 can also be provided between the inner peripheral edge and the outer peripheral edge of the rotor inner iron core 11, and a channel is provided in the rotor inner iron core 11 to communicate the first injection hole 1102 and the shaft hole 1101.

[0052] Such as Figure 10 , in some embodiments, the rotor inner iron core 11 includes at least two connecting portions 111 and at least two convex portions 112. The at least two connecting portions 111 and the at least two convex portions 112 are alternately distributed around the shaft hole 1101, and the convex portions protrude from the outer peripheral surface of the connecting portions. Thereby, the structural strength of the cooperation between the rotor inner iron core 11 and the injection structure can be further improved. Optionally, the first injection hole 1102 is provided on the convex portion. It can improve the structural strength of the rotor inner iron core 11.

[0053] 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. As Figures 1 to 4 shown, the first injection hole 1102 is set to be square and communicates with the shaft hole 1101, and the first injection hole 1102 is set to be a rectangle extending along the radial direction of the inner iron core 11 of the rotor; as Figure 5 shown, the first injection hole 1102 is set to be a circular hole, the peripheral edge of the first injection hole 1102 is set to be semi-circular arc-shaped, and the central angle of the first injection hole 1102 is set within the range of 0 to 360°. For example, the central angle of the first injection hole 1102 can be set to be greater than 90° and less than 270°, etc.

[0054] In addition, the first injection hole 1102 can also be configured to be a dovetail tooth-shaped structure that becomes narrower or wider from wide to narrow or from narrow to wide along the radial direction of the inner iron core 11 of the rotor, which can realize the radial positioning of the injection structure and the inner iron core 11 of the rotor, and effectively improve the connection strength and stability between the injection structure and the inner iron core 11 of the rotor. As Figures 6 to 8 shown, the first injection hole 1102 is set to be a dovetail tooth-shaped structure that becomes wider from narrow to wide radially outward.

[0055] As Figure 2 , in some embodiments, the dimension L1 of the first injection hole 1102 along the radial direction of the inner iron core 11 of the rotor and the outer diameter dimension D2 of the inner iron core 11 of the rotor satisfy: 0.05 ≤ L1 / D2 ≤ 0.4. For example, L1 / D2 can be set to 0.05, 0.1, 0.25, 0.38 or 0.4, etc.;

[0056] In some embodiments, the dimension L1 of the first injection hole 1102 along the radial direction of the inner iron core 11 of the rotor and the inner diameter dimension D3 of the inner iron core 11 of the rotor satisfy 0.1 ≤ L1 / D3 ≤ 1.5; for example, L1 / D3 can be set to 0.1, 0.15, 0.5, 0.8, 1, 1.2 or 1.5, etc.

[0057] In some embodiments, the dimension L1 of the first injection hole 1102 along the radial direction of the inner iron core 11 of the rotor and the inner and outer peripheral spacing dimension L4 of the inner iron core 11 of the rotor satisfy 0.1 ≤ L1 / L4 ≤ 0.8; for example, L1 / L4 can be set to 0.1, 0.25, 0.34, 0.6, 0.75, 0.78 or 0.8, etc.

[0058] In some embodiments, there is a spacing L5 in the radial direction of the inner core 11 of the rotor between the first injection hole 1102 and the outer periphery of the inner core 11 of the rotor. The dimension L1 of the first injection hole 1102 in the radial direction of the inner core 11 of the rotor and the spacing L5 satisfy: 0.5 ≤ L1 / L5 ≤ 5. For example, L1 / L5 can be set to 0.5, 1.5, 2.5, 3, 3.8, 4.5, 5, etc.

[0059] In some embodiments, the width dimension W1 of the first injection hole 1102 and the outer diameter dimension D2 of the inner core 11 of the rotor satisfy: 0.05 ≤ W1 / D2 ≤ 0.45. For example, W1 / D2 can be set to 0.01, 0.05, 0.1, 0.15, 0.25, 0.34, 0.45, etc.

[0060] Through the foregoing settings, the radial dimension of the first injection hole 1102 can be restricted, avoiding the influence on the structural strength of the inner core 11 of the rotor caused by an over-large radial dimension of the first injection hole 1102, and also avoiding an over-small radial dimension of the first injection hole 1102, which may cause the injection medium to be difficult to enter the first injection hole 1102. Thus, the structural strength and stability of the inner core 11 of the rotor can be effectively improved. In addition, the structural strength of the inner core 11 of the rotor can also be improved, as well as the connection structural strength between the inner core 11 of the rotor and the injection structure. In addition, the structural strength and stability of the rotor assembly can be improved, the magnetic leakage can be reduced, and the performance of the rotor assembly or the motor having the inner core 11 of the rotor can be improved.

[0061] In some embodiments, the inner core 11 of the rotor has at least two first injection holes 1102. After the injection molding of the rotor assembly is completed, injection media are respectively disposed in the plurality of first injection holes 1102, thereby avoiding the displacement of the inner core 11 of the rotor caused by the manufacturing error of a single first injection hole 1102, effectively improving the stability and connection strength of the inner core 11 of the rotor, and maintaining the relative position between the inner core 11 of the rotor and the magnetic member, and optimizing the structural stability of the rotor assembly.

[0062] In addition, the foregoing at least two first injection holes 1102 are distributed around the shaft hole 1101, which can further improve the stability and structural strength of the inner core 11 of the rotor. In addition, the foregoing first injection holes 1102 can also be arranged in the radial direction of the shaft hole 1101.

[0063] In some embodiments, the number n of the first injection holes 1102 satisfies 2 ≤ n ≤ 20. This can conveniently utilize the first injection molding to improve the structural strength and stability of the rotor assembly, and can maintain the relative positions of the inner iron core 11 and the magnetic components within the rotor. Additionally, it can 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 utility model can be set to 2, 3, 4, 5, 8, 10, 12, 20, etc. Preferably, the number of the first injection holes 1102 can be set between 4 and 12.

[0064] In addition, at least two first injection holes 1102 are evenly spaced around the shaft hole 1101. For example, as Figure 1 and Figure 2 shown, four square first injection holes 1102 are evenly spaced along the circumferential direction of the inner iron core 11 of the rotor; as Figure 3 shown, six square first injection holes 1102 are evenly spaced along the circumferential direction of the inner iron core 11 of the rotor; as Figure 4 shown, eight square first injection holes 1102 are evenly spaced along the circumferential direction of the inner iron core 11 of the rotor; as Figure 5 shown, four circular first injection holes 1102 are evenly spaced along the circumferential direction of the inner iron core 11 of the rotor; as Figure 6 shown, four dovetail-tooth-shaped first injection holes 1102 are evenly spaced along the circumferential direction of the inner iron core 11 of the rotor; as Figure 7 shown, six dovetail-tooth-shaped first injection holes 1102 are evenly spaced along the circumferential direction of the inner iron core 11 of the rotor; as Figure 8 shown, eight dovetail-tooth-shaped first injection holes 1102 are evenly spaced along the circumferential direction of the inner iron core 11 of the rotor. Of course, the above embodiments are merely some examples of the present utility model and are not limitations on the protection scope of the present utility model. Through the above settings, the inner iron core 11 of the rotor in the present utility model can not only avoid the problem of relative position offset between the inner rotor and the outer rotor of the iron core caused by the processing error of the first injection hole 1102, improve the relative position between the inner rotor 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 having the inner iron core 11 of the rotor.

[0065] In some embodiments, the shaft hole 1101 penetrates through the inner rotor iron core 11 along the axial direction; and / or, the first injection hole 1102 penetrates through the inner rotor iron core 11 along the axial direction. Thereby, the connection strength and stability between the rotating shaft 15 and the inner rotor iron core 11, as well as between the inner rotor iron core 11 and the magnetic member, are improved. Of course, the shaft hole 1101 in the present utility model can also be set not to penetrate through the inner rotor iron core 11, that is to say, one end of the shaft hole 1101 is provided on one end face of the inner rotor iron core 11, and the other end of the shaft hole 1101 is spaced apart from the end face of the other end of the inner rotor iron core 11. Additionally, the first injection hole 1102 can also be set not to penetrate through the inner rotor iron core 11.

[0066] As Figure 9 , in some embodiments, the inner rotor iron core 11 of the present utility model further has a groove 1103, the groove 1103 is provided on the outer periphery of the inner rotor iron core 11, and the inner peripheral edge of the groove 1103 is connected to the outer peripheral edge of the inner rotor iron core 11. By providing the groove 1103 and utilizing the cooperation of the first injection hole 1102 and the groove 1103, the stability and connection structure strength of the inner rotor iron core 11 can be further improved, thereby further improving the structural strength and service life of the rotor assembly.

[0067] Among them, the groove 1103 and the first injection hole 1102 can be distributed in a staggered manner around the shaft hole 1101. In this way, it can be avoided that the local width of the inner rotor iron core 11 is too small and affects the structural strength of the inner rotor iron core 11, and moreover, the structural strength and stability of the inner rotor iron core 11 after assembly can be further improved.

[0068] In addition, the groove 1103 can also be set to include at least two distributed around the shaft hole 1101. Optionally, the groove 1103 can be configured as circular, elliptical, polygonal, strip-shaped or irregular. Injection media are respectively disposed in the plurality of grooves 1103, thereby avoiding the displacement of the inner rotor iron core 11 caused by the manufacturing error of a single groove 1103, effectively improving the stability and connection strength of the inner rotor iron core 11, and maintaining the relative position between the inner rotor iron core 11 and the magnetic member, and optimizing the structural stability of the rotor assembly.

[0069] In addition, the foregoing at least two grooves 1103 are distributed around the shaft hole 1101, which can further improve the stability and structural strength of the inner rotor iron core 11. In addition, the foregoing groove 1103 can also be set to be arranged along the radial direction of the shaft hole 1101.

[0070] In some embodiments, the inner iron core 11 of the rotor is further provided with a second injection hole, which is arranged between the outer peripheral edge and the inner peripheral edge of the inner iron core 11 of the rotor and is spaced apart from the outer peripheral edge of the inner iron core 11 of the rotor. This can prevent the injection structure from slipping off 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.

[0071] In some embodiments, the second injection hole and the first injection hole 1102 are distributed in a staggered manner around the shaft hole 1101. In this way, it is possible to prevent the local width of the inner iron core 11 of the rotor from being too small and affecting the structural strength of the inner iron core 11 of the rotor. Moreover, it can further improve the structural strength and stability of the inner iron core 11 of the rotor after assembly.

[0072] The second injection hole includes at least two distributed around the shaft hole 1101. Injection media are respectively disposed in the plurality of second injection holes, so as to prevent the displacement of the inner iron core 11 of the rotor caused by the manufacturing error of a single second injection hole, effectively improve the stability and connection strength of the inner iron core 11 of the rotor, and maintain the relative position between the inner iron core 11 of the rotor and the magnetic member, optimizing the structural stability of the rotor assembly.

[0073] As Figures 11 to 16 , the present utility model further 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 in the present utility model may include but is not limited to the following embodiments.

[0075] Embodiment 1

[0076] As Figures 11 to 14 , the rotor assembly 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 disposed on the outer iron core 12 of the rotor; the rotor assembly further includes: an injection molded part 13, and the injection molded part 13 integrally injection-molds the inner iron core 11 of the rotor, the outer iron core 12 of the rotor, 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 position between the inner iron core 11 of the rotor and the outer iron core 12 of the rotor, improving the structural stability of the rotor assembly 10.

[0077] 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 efficiency of the motor, 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.

[0078] In addition, asFigure 12 The outer rotor iron core 12 is provided with a third injection hole 1201. The inner rotor iron core 11 and the outer rotor iron core 12 can be injection-molded into one body. The injection-molded parts respectively pass through the first injection hole 1102 and the third injection hole 1201, which can maintain the connection structure strength between the inner rotor iron core 11 and the outer rotor iron core 12. In addition, it can also maintain the relative positions of the inner rotor iron core 11 and the outer rotor iron core 12, optimizing the structural stability of the rotor assembly 10.

[0079] Combined with Figure 2 、 Figure 12 and Figure 13 ,the outer diameter dimension of the outer rotor iron core 12 is D6, and the dimension L1 of the first injection hole 1102 along the radial direction of the inner rotor iron core 11 and D6 satisfy: 0.005 ≤ L1 / D6 ≤ 0.25. For example, L1 / D6 can be set to 0.005, 0.01, 0.08, 0.085, 0.15, 0.2 or 0.25, etc. Through the above setting form, the structural strength of the inner rotor iron core 11 can be improved, as well as the connection structure strength between the inner rotor iron core 11 and the injection-molded parts. In addition, it can also improve the structural strength and stability of the rotor assembly 10, reduce magnetic leakage, and improve the performance of the rotor assembly or motor with this inner rotor iron core 11.

[0080] Combined with Figures 11 to 16 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, the 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.

[0081] The injection-molded part 13 injection-molds and connects the inner rotor iron core 11 and the magnetic part 14 into one body, and the injection-molded part passes through the first injection hole 1102. It can use the shaft hole 1101 to realize the assembly of the inner rotor iron core 11 and the rotating shaft 15, and use the first injection hole 1102 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, it can reduce magnetic leakage, improve the working efficiency and manufacturing efficiency of the motor. The inner rotor iron core 11 and the outer rotor iron core 12 are separated, playing an insulating role, reducing the shaft voltage, and improving the motor life. In addition, it reduces magnetic leakage, improves the motor efficiency, and improves the manufacturing efficiency.

[0082] Optionally, the inner edge of the outer rotor iron core is provided with a notch to improve the stability and connection strength of the cooperation between the injection-molded part and the outer rotor iron core.

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

[0084] Example 1, such as Figure 11 and 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 member. Specifically, the magnetic member can include a plurality of magnetic tiles, and the magnetic tiles are arranged between adjacent sub-outer iron cores.

[0085] Example 2, such as Figure 14 , the outer rotor iron core 12 is arranged around the inner rotor iron core 11, and 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. Among them, the outer rotor iron core 12 can be an integral structure or can be provided with a plurality of sub-outer iron cores.

[0086] Embodiment 2

[0087] Such as Figure 15 , the magnetic member 14 is injection-molded on the inner rotor iron core 11. And the magnetic member 14 constructs a magnetic ring around the inner rotor iron core 11, and the injection structure in the foregoing embodiment is the magnetic member 14. Combining the foregoing embodiments, the inner rotor iron core 11 is provided with a first injection hole, and the magnetic member 14 can be passed through the first injection hole.

[0088] The present utility model also provides a motor, including the foregoing inner rotor iron core or rotor assembly. The present utility model also provides a household appliance, including the foregoing inner rotor iron core, rotor assembly or motor.

[0089] 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 indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0090] In the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. 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.

[0091] In the present utility model, unless otherwise clearly defined and 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 indirectly in 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 horizontal height of the first feature is higher than that of 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 horizontal height of the first feature is less than that of the second feature.

[0092] In the description of this specification, the descriptions with reference to the terms "an embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean 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 are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0093] 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 the first injection hole (1102) communicates with the shaft hole (1101).

2. The inner iron core (11) of the rotor according to claim 1, characterized in that, The first injection hole (1102) is provided on the inner peripheral edge of the inner iron core (11) of the rotor and is spaced apart from the outer peripheral edge of the inner iron core (11) of the rotor.

3. 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 peripheral edge and the outer peripheral edge of the inner iron core (11) of the rotor, and the inner iron core of the rotor is provided with a channel communicating the first injection hole (1102) and the shaft hole (1101).

4. The inner iron core (11) of the rotor according to any one of claims 1 to 3, characterized in that The inner iron core (11) of the rotor includes at least two connecting portions and at least two convex portions, the at least two connecting portions and the at least two convex portions are alternately distributed around the shaft hole (1101), and the convex portions protrude from the outer peripheral surface of the connecting portions.

5. The inner iron core (11) of the rotor according to claim 4, characterized in that, The first injection hole (1102) is provided on the convex portion.

6. The inner iron core (11) of the rotor according to any one of claims 1 to 3, characterized in that The first injection hole (1102) is configured to be circular, elliptical, polygonal or strip-shaped; or, the first injection hole (1102) is configured to be a dovetail tooth-shaped structure that becomes narrower or wider from wide to narrow radially outward along the inner iron core (11) of the rotor.

7. The inner iron core (11) of the rotor according to any one of claims 1-3, characterized in that, A groove (1103) is provided on the outer peripheral edge of the inner iron core (11) of the rotor.

8. The inner iron core (11) of the rotor according to claim 7, characterized in that, The groove (1103) and the first injection hole (1102) are misaligned around the shaft hole (1101); and / or, the groove (1103) includes at least two distributed around the shaft hole (1101); and / or, the groove (1103) is configured to be circular, elliptical, polygonal or strip-shaped.

9. The inner iron core (11) of the rotor according to any one of claims 1-3, characterized in that, The inner iron core (11) of the rotor is further provided with a second injection hole, and the second injection hole is provided between the outer peripheral edge and the outer peripheral edge of the inner iron core (11) of the rotor and is spaced apart from the outer peripheral edge and the outer peripheral edge of the inner iron core (11) of the rotor.

10. The inner iron core (11) of the rotor according to claim 9, characterized in that, The second injection hole and the first injection hole (1102) are misaligned around the shaft hole (1101); and / or, the second injection hole includes at least two distributed around the shaft hole (1101).

11. The inner iron core (11) of the rotor according to any one of claims 1-3, characterized in that, The dimension L1 of the first injection hole (1102) along the radial direction of the inner iron core (11) of the rotor and the outer circle diameter dimension D2 of the inner iron core (11) of the rotor satisfy: 0.05 ≤ L1 / D2 ≤ 0.4; and / or, the dimension L1 of the first injection hole (1102) along the radial direction of the inner iron core (11) of the rotor and the inner circle diameter dimension D3 of the inner iron core (11) of the rotor satisfy 0.1 ≤ L1 / D3 ≤ 1.5; and / or, the dimension L1 of the first injection hole (1102) along the radial direction of the inner iron core (11) of the rotor and the inner and outer peripheral spacing dimension L4 of the inner iron core (11) of the rotor satisfy 0.1 ≤ L1 / L4 ≤ 0.8; and / or, the first injection hole (1102) and the outer peripheral edge of the inner iron core (11) of the rotor have a radial spacing L5 along the radial direction of the inner iron core (11) of the rotor, and the dimension L1 of the first injection hole (1102) along the radial direction of the inner iron core (11) of the rotor and the spacing L5 satisfy: 0.5 ≤ L1 / L5 ≤ 5; And / or, the width dimension W1 of the first injection hole (1102) and the outer diameter dimension D2 of the inner iron core (11) of the rotor satisfy: 0.05 ≤ W1 / D2 ≤ 0.

45.

12. The inner iron core (11) of the rotor according to any one of claims 1-3, 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.

13. A rotor assembly, characterized in that, Comprising: The inner iron core (11) of the rotor according to any one of claims 1-12; A magnetic member (14), the magnetic member (14) surrounding the inner iron core (11) of the rotor.

14. The rotor assembly according to claim 13, characterized in that, The rotor assembly further comprises: An outer iron core (12) of the rotor, the outer iron core (12) of the rotor surrounding the inner iron core (11) of the rotor, and the magnetic member (14) is disposed on the outer iron core (12) of the rotor; An injection molded part, the injection molded part integrally injection molding and connecting the inner iron core (11) of the rotor, the outer iron core (12) of the rotor and the magnetic member (14), and the injection molded part penetrates through the first injection hole (1102).

15. The rotor assembly according to claim 14, characterized in that, The outer iron core (12) of the rotor is spaced apart from the inner iron core (11) of the rotor; And / or, the outer iron core (12) of the rotor is provided with a third injection hole (1201); And / or, the inner edge of the outer iron core (12) of the rotor is provided with a notch; And / or, the outer diameter dimension of the outer iron core (12) of the rotor is D6, and the dimension L1 of the first injection hole (1102) along the radial direction of the inner iron core (11) of the rotor and the D6 satisfy: 0.005 ≤ L1 / D6 ≤ 0.

25.

16. The rotor assembly according to claim 14, wherein The outer iron core (12) of the rotor includes a plurality of sub-outer iron cores distributed around the inner iron core (11) of the rotor, 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 iron core (12) of the rotor is arranged around the inner iron core (11) of the rotor, 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 iron core (12) of the rotor.

17. The rotor assembly according to claim 13, characterized in that, The magnetic member (14) is injection molded on the inner iron core (11) of the rotor and constructs a magnetic ring surrounding the inner iron core of the rotor, and the magnetic member (14) penetrates through the first injection hole (1102).

18. A motor, characterized in that, Comprising the inner iron core (11) of the rotor according to any one of claims 1-12; or, comprising the rotor assembly according to any one of claims 13-17.

19. A household appliance, characterized in that, Comprising the inner iron core (11) of the rotor according to any one of claims 1-12; or, comprising the rotor assembly according to any one of claims 13-17; or, comprising the motor according to claim 18.

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