Rotor punching sheet, rotor outer iron core, rotor iron core, motor and household electrical appliance

Abstract

The utility model discloses a rotor punching sheet, a rotor outer iron core, a rotor iron core, a motor and a household electrical appliance, the rotor punching sheet comprises a punching sheet main body and a bridge part connected with the punching sheet main body, the punching sheet main body is provided with a first side surface and a second side surface opposite to each other along the circumferential direction of the rotor iron core, and the bridge part extends along the circumferential direction and extends out of the first side surface. And the size of the bridge part extending out of the second side surface is 0 or less than that of the bridge part extending out of the first side surface. According to the rotor punching sheet provided by the embodiment of the utility model, the rotor iron core constructed by the rotor punching sheet can reduce the material consumption of the rotor iron core, reduce the cost, reduce the magnetic flux leakage and improve the efficiency of a motor.

Description

Technical Field

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

[0002] Existing motors generally use radial rotors or surface-mounted rotors. The surface-mounted rotor is to paste a plurality of permanent magnets on the outer peripheral surface of a cylindrical rotor iron core in sequence along the circumferential direction, while the radial rotor is to embed a plurality of permanent magnets in the empty slots of the rotor iron core along the circumferential direction. Compared with the surface-mounted rotor motor, the radial rotor has the advantages of reliable rotor structure and strong overload capacity, and has attracted more and more attention in the industry. However, due to the structural characteristics of the punching sheet, the radial rotor is more likely to have magnetic leakage, which has an adverse effect on the performance of the motor. Summary of the Utility Model

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

[0004] The rotor punching sheet according to an embodiment of the utility model is used for a rotor iron core, and includes a punching sheet main body and a bridge part connecting the punching sheet main body. The punching sheet main body has opposite first and second side surfaces along the circumferential direction of the rotor iron core. The bridge part extends along the circumferential direction and protrudes from the first side surface, and the size of the bridge part protruding from the second side surface is 0 or less than the size of the part of the bridge part protruding from the first side surface.

[0005] The rotor punching sheet according to an embodiment of the utility model can reduce the material consumption of the rotor iron core, lower the cost, and at the same time reduce magnetic leakage and improve the efficiency of the motor when constructing the rotor iron core.

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

[0007] In some embodiments, the punching sheet main body has opposite inner and outer ends along the radial direction of the rotor iron core, and the bridge part is connected to the inner end.

[0008] In some embodiments, the part of the bridge part protruding from the first side surface includes a first surface, a second surface and an end surface. The first surface and the second surface are opposite along the radial direction of the rotor iron core, and the end surface connects the first surface and the second surface. Among them, the first surface and the second surface are parallel to each other, and the end surface is perpendicular to the first surface and the second surface; and / or, the end surface is set as a convex arc surface; and / or, the first surface and the first side surface are used together for positioning the magnetic tile, and the first surface and the first side surface are perpendicular.

[0009] In some embodiments, the portion of the bridge portion extending out of the first side surface is straight strip-shaped, arc-shaped strip-shaped or fishhook-shaped.

[0010] In some embodiments, the width dimension of the portion of the bridge portion extending out of the first side surface along the circumferential direction is w1, the maximum width dimension of the punching sheet body along the circumferential direction is w2, and the minimum width dimension of the punching sheet body along the circumferential direction is w3, where 0.01 ≤ w1 / w2 ≤ 0.2; and / or, 0.2 ≤ w1 / w3 ≤ 3;

[0011] and / or, the height dimension of the portion of the bridge portion extending out of the first side surface along the radial direction of the rotor core is h1, and the height dimension of the rotor punching sheet along the radial direction is h2, where 0.01 ≤ h1 / h2 ≤ 0.2.

[0012] In some embodiments, the punching sheet body is provided with injection holes.

[0013] The outer rotor core according to an embodiment of the present invention includes a plurality of the aforementioned rotor punching sheets, and the plurality of rotor punching sheets are stacked along the axis direction of the outer rotor core.

[0014] In some embodiments, the plurality of rotor punching sheets include a first punching sheet and a second punching sheet, and the orientations of the first side surfaces of the first punching sheet and the second punching sheet are opposite.

[0015] In some embodiments, the second punching sheet is provided between at least two of the first punching sheets, and a groove portion is formed between the portions of the bridge portions of the at least two first punching sheets extending out of the first side surface; or, the plurality of rotor punching sheets include a first punching sheet group and a second punching sheet group, the first punching sheet group and the second punching sheet group are arranged in an interleaved manner, the first punching sheet group includes at least one first punching sheet, and the second punching sheet group includes at least one second punching sheet; or, the first punching sheet and the second punching sheet have the same shape and size, or, the first punching sheet and the second punching sheet are provided in symmetric shapes.

[0016] The rotor core according to an embodiment of the present invention includes a plurality of the aforementioned outer rotor cores, and the plurality of outer rotor cores surround the axis of the rotor core, and a placement groove is formed between adjacent rotor cores.

[0017] In some embodiments, the width dimension of the placement groove along the circumferential direction of the rotor core is w4, and the width dimension of the portion of the bridge portion extending out of the first side surface is w1, where 0.05 ≤ w1 / w4 ≤ 0.5;

[0018] And / or, the rotor core further includes an inner rotor core, which is disposed inside the plurality of outer rotor cores. The inner rotor core has a shaft hole and is spaced apart from the outer rotor cores.

[0019] The motor according to an embodiment of the present invention includes the aforementioned outer rotor core; or includes the aforementioned rotor core.

[0020] The household appliance according to an embodiment of the present invention includes the aforementioned outer rotor core; or includes the aforementioned rotor core; or includes the aforementioned motor. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of a rotor punching sheet according to an embodiment of the present invention.

[0022] Figure 2 It is a schematic diagram of a rotor punching sheet according to an embodiment of the present invention.

[0023] Figure 3 It is Figure 2 A partial enlarged schematic diagram of area A in the middle circle.

[0024] Figure 4 It is a schematic diagram of a rotor punching sheet according to an embodiment of the present invention.

[0025] Figure 5 It is Figure 4 A partial enlarged schematic diagram of area B in the middle circle.

[0026] Figure 6 It is a schematic diagram of a rotor punching sheet according to an embodiment of the present invention.

[0027] Figure 7 It is Figure 6 A partial enlarged schematic diagram of area C in the middle circle.

[0028] Figure 8 It is a schematic diagram of the cooperation of adjacent outer rotor cores in a rotor core according to an embodiment of the present invention.

[0029] Figure 9 It is a schematic diagram of an outer rotor core according to an embodiment of the present invention.

[0030] Figure 10 It is a schematic diagram of an outer rotor core according to an embodiment of the present invention.

[0031] Figure 11 It is a schematic diagram of an outer rotor core according to an embodiment of the present invention.

[0032] Figure 12 It is a schematic diagram of an outer rotor core according to an embodiment of the present invention.

[0033] Figure 13 It is a schematic diagram of the rotor core of an embodiment of the present utility model.

[0034] Figure 14 It is a schematic diagram of the rotor core of an embodiment of the present utility model.

[0035] Reference numerals: rotor punching sheet 10, punching sheet main body 11, first side surface 1101, second side surface 1102, injection hole 1103, first positioning portion 111, second positioning portion 112, bridge portion 12, first surface 1201, second surface 1202, end surface 1203, rotor outer core 100, first punching sheet 110, second punching sheet 120, rotor core 1000, placement groove 1001. Detailed implementation manners

[0036] The embodiments of the present utility model will be described in detail below. 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 utility model and should not be construed as limiting the present utility model.

[0037] As Figures 1 to 7 , the rotor punching sheet 10 according to an embodiment of the present utility model, which is used for the rotor core 1000, includes a punching sheet main body 11 and a bridge portion 12. The front part is connected to the punching sheet main body 11. The punching sheet main body 11 has opposite first side surface 1101 and second side surface 1102. The first side surface 1101 and the second side surface 1102 are opposite along the circumferential direction of the rotor core 1000. The bridge portion 12 extends along the circumferential direction, and the bridge portion 12 extends out of the first side surface 1101. Wherein, the dimension of the bridge portion 12 extending out of the second side surface 1102 is 0, for example, the bridge portion 12 does not extend out of the second side surface 1102; or, the dimension of the part of the bridge portion 12 extending out of the second side surface 1102 is smaller than the dimension of the part of the bridge portion 12 extending out of the first side surface 1101.

[0038] In the rotor core 1000, a plurality of rotor punching sheets 10 can be stacked to form the rotor outer core 100, and the rotor core 1000 can include a plurality of rotor outer cores 100 distributed around the axis of the rotor core 1000. Among them, the magnetic tiles are positioned between adjacent rotor outer cores 100. Wherein, the part of the bridge portion 12 extending out of the first side surface 1101 will provide positioning for the magnetic tiles, so that the magnetic tiles can be stably located between adjacent rotor cores 1000. And because the bridge portion 12 does not extend out of the second side surface 1102, or the dimension of the part of the bridge portion 12 extending out of the second side surface 1102 is smaller than the dimension of the part of the bridge portion 12 extending out of the first side surface 1101, the blocking of the bridge portion 12 on the magnetic tiles can be reduced, so as to reduce magnetic leakage.

[0039] According to the rotor punching sheet 10 of the embodiment of the present utility model, the rotor core 1000 constructed by the rotor punching sheet 10 can reduce the material consumption of the rotor core 1000, reduce the cost, and at the same time can reduce the magnetic leakage and improve the efficiency of the motor.

[0040] As Figures 1 to 7 , according to some embodiments of the present utility model, the punching sheet main body 11 has opposite inner ends and outer ends in the radial direction of the rotor core 1000, and the bridge portion 12 is connected to the inner end. In addition, a first positioning portion 111 and a second positioning portion 112 are provided at the outer end of the punching sheet main body 11. The first positioning portion 111 can protrude from the first side surface 1101 of the punching sheet main body 11, and the second positioning portion 112 can protrude from the second side surface 1102 of the punching sheet main body 11. The first positioning portion 111 can cooperate with the bridge portion 12 to position the magnetic tile; the second positioning portion 112 can cooperate with the bridge portion 12 of other rotor punching sheets 10 to position the magnetic tile, so that the magnetic tile can be positioned by stacking a plurality of rotor punching sheets 10. In addition, by arranging the bridge portion 12 at the inner end of the punching sheet main body 11 and the first positioning portion 111 and the second positioning portion 112 at the outer end of the punching sheet main body 11, the rotor core 1000 can have a larger space to place the magnetic tile, so that the volume of the magnetic tile can be increased to improve the motor efficiency.

[0041] In addition, the first side surface 1101 and the second side surface 1102 are in a fan shape that gradually expands outward from the inner end to the outer end.

[0042] Of course, the front portion can also be connected between the inner end and the outer end of the punching sheet main body 11.

[0043] As Figure 1 and Figure 2 , according to some embodiments of the present utility model, the portion of the bridge portion 12 protruding from the first side surface 1101 includes a first surface 1201, a second surface 1202 and an end surface 1203. The first surface 1201 and the second surface 1202 are opposite to each other in the radial direction of the rotor core 1000, and the end surface 1203 connects the first surface 1201 and the second surface 1202.

[0044] In some examples, such as Figure 3 and Figure 4 , the first surface 1201 and the second surface 1202 are parallel to each other, and the end surface 1203 is perpendicular to the first surface 1201 and the second surface 1202. The bridge portion 12 is arranged in a rectangular shape to facilitate the positioning of the magnetic tile and improve the positioning effect of the magnetic tile. Wherein the end surface 1203 can be connected to the first surface 1201 and the second surface 1202 at a right angle, and the end surface 1203 can also be arc-transitioned, rounded or chamfered with the first surface 1201 and the second surface 1202.

[0045] In other examples, such as Figure 4, the end face 1203 is set as a convex arc surface. The end face 1203 can be set as a circular arc. Preferably, the end face 1203 and the first surface 1201 and the second surface 1202 are set as arc transitions or tangencies.

[0046] In some other examples, the first surface 1201 and the first side surface 1101 cooperate to position the magnetic tile, and the first surface 1201 and the first side surface 1101 are perpendicular. The cooperation stability between the magnetic tile and the rotor punching sheet 10 can be increased, thereby improving the positioning effect on the magnetic tile and thus improving the efficiency of the motor.

[0047] Such as Figures 1 to 3 , in some examples, the part of the bridge 12 extending out of the first side surface 1101 is set as a straight strip. Among them, this part can be set perpendicular to the first side surface 1101, or have an included angle with the first side surface 1101 at a predetermined angle. For example, an included angle between 30° and 120° is set between this part and the first side surface 1101.

[0048] In addition, such as Figure 4 and Figure 5 , this part can also be set as an arc strip. Specifically, this part can be set as an arc centered on the axis of the rotor core 1000; a non-arc extending around the axis of the rotor core 1000; an arc with a circle offset from the axis of the rotor core 1000, etc.

[0049] Such as Figure 6 and Figure 7 , this part can also be set as a fishhook shape. That is to say, in the extending direction away from the punching sheet main body 11, this part first inclines towards the axis of the rotor core 1000 and then inclines towards the direction away from the rotor core 1000, so as to set this part as a fishhook shape with the opening facing away from the axis of the rotor core 1000. In addition, the multiple rotor punching sheets 10 in the rotor core 1000 can have the same shape or different shapes, especially the shape of the bridge 12 can be different; in addition, the multiple rotor punching sheets 10 laminated in the outer rotor core 100 can have the same shape or different shapes, especially the shape of the bridge 12 can be different.

[0050] Of course, the above description of the shape of this part is not a limitation on the protection scope of the present utility model. This part can also be set as an arc protruding towards the axis of the rotor core 1000, etc.

[0051] Such as Figures 2 to 6, in some embodiments, the circumferential width dimension of the bridge portion 12 extending out of the first side surface 1101 is w1, the maximum circumferential width dimension of the punching sheet body 11 is w2, and the minimum circumferential width dimension of the punching sheet body 11 is w3, where 0.01 ≤ w1 / w2 ≤ 0.2; and / or, 0.2 ≤ w1 / w3 ≤ 3. Optionally, w1 / w2 can be set to 0.01, 0.09, 0.1, 0.15, 0.2, etc., and w1 / w3 can be set to 0.2, 0.3, 1.5, 2.5, 3, etc. Through the above settings, the bridge portion 12 can have a certain structural strength, improving the structural strength and stability of the rotor punching sheet 10, thereby enabling effective positioning of the magnetic tile, and extending the structural strength and service life of the rotor core 1000, etc., and improving the motor efficiency.

[0052] As Figure 2 and Figure 3 , in some embodiments, the height dimension of the portion of the bridge portion 12 extending out of the first side surface 1101 in the radial direction of the rotor core 1000 is h1, and the height dimension of the rotor punching sheet 10 in the radial direction is h2, where 0.01 ≤ h1 / h2 ≤ 0.2. Optionally, h1 / h2 can be set to 0.01, 0.09, 0.1, 0.15, 0.2, etc. Through the above settings, the structural strength of the bridge portion 12 can be further increased.

[0053] As Figure 2 、 Figure 4 and Figure 6 , in some embodiments, the punching sheet body 11 is provided with injection holes 1103. The rotor core 1000 may include a rotor outer core 100 and an injection molded part. The rotor outer core 100 may be formed by laminating a plurality of rotor punching sheets 10. The injection holes 1103 of the plurality of rotor punching sheets 10 are opposite to each other, and the injection molded part can pass through the injection holes 1103, thereby realizing the positioning of the laminated plurality of rotor punching sheets 10, and being able to avoid the displacement of the rotor outer core 100, etc., improving the structural strength and stability of the rotor core 1000. In addition, the punching sheet body 11 is further provided with positioning holes 1104 and riveting points 1105.

[0054] As Figures 9 to 12 , the rotor outer core 100 according to the embodiment of the present invention is characterized in that it includes a plurality of the aforementioned rotor punching sheets 10, and the plurality of rotor punching sheets 10 are laminated along the axial direction of the rotor outer core 100. By laminating a plurality of the aforementioned rotor punching sheets 10 to form the rotor outer core 100, it is convenient to position the magnetic tile using the rotor outer core 100, reduce the rotor material consumption, lower the cost, and at the same time reduce magnetic leakage and improve the motor efficiency.

[0055] As Figures 9 to 12, in some embodiments, the multiple rotor punching sheets 10 include a first punching sheet 110 and a second punching sheet 120, and the orientations of the first side 1101 of the first punching sheet 110 and the first side 1101 of the second punching sheet 120 are opposite. The multiple rotor cores 1000 can be arranged around the axis of the rotor core 1000, and a structure for positioning the magnetic tiles is constructed between the multiple rotor cores 1000. By providing the first punching sheet 110 and the second punching sheet 120, the bridge portions 12 can be provided on both sides of the outer rotor core 100 along the circumferential direction of the rotor core 1000, thereby realizing the positioning of the magnetic tiles.

[0056] As Figures 9 to 12 , in some examples, a second punching sheet 120 is provided between at least two first punching sheets 110, and a groove portion is constructed between the portions of the bridge portions 12 of the at least two first punching sheets 110 that extend out of the first side 1101. The magnetic tiles can be positioned by using the portions of the bridge portions 12 that extend out of the first side 1101, and the groove portion can be used to reduce the material consumption, reduce the cost, and reduce the magnetic leakage to improve the motor efficiency.

[0057] In some examples, the multiple rotor punching sheets 10 include a first punching sheet group and a second punching sheet group, and the first punching sheet group and the second punching sheet group are arranged alternately. The first punching sheet group includes at least one first punching sheet 110, and the second punching sheet 120 includes at least one second punching sheet 120. Among them, different first punching sheet groups can have the same number of first punching sheets 110; or, at least two first punching sheet groups can have different numbers of first punching sheets 110; or, different second punching sheet groups can have the same number of second punching sheets 120; or, at least two second punching sheet groups can have different numbers of second punching sheets 120; or, the number of first punching sheets 110 in the first punching sheet group is the same as the number of second punching sheets 120 in the second punching sheet group; or the number of first punching sheets 110 in at least one first punching sheet group is different from the number of second punching sheets 120 in at least one second punching sheet group. Among them, the number of first punching sheets 110 in the first punching sheet group can be greater than or equal to 1 and less than or equal to 20. For example, the number of first punching sheets 110 in the first punching sheet group is set to 1, three, etc. The number of second punching sheets 120 in the second punching sheet group can be greater than or equal to 1 and less than or equal to 20. For example, the number of second punching sheets 120 in the second punching sheet group is set to 1, three, etc.

[0058] In some examples, the first punching sheet 110 and the second punching sheet 120 have the same shape and size. The rotor punching sheets 10 can be manufactured by the same process, and the rotor punching sheets 10 can be flipped to construct the first punching sheet 110 and the second punching sheet 120, or in other words, the second punching sheet 120 has the same shape and size as the first punching sheet 110 after being flipped, thereby simplifying the manufacture of the outer rotor core 100. In addition, the first punching sheet 110 and the second punching sheet 120 can also be set to be symmetrically shaped.

[0059] AsFigure 13 and Figure 14 According to an embodiment of the present utility model, the rotor core 1000 includes a plurality of the aforementioned rotor outer cores 100. The plurality of rotor outer cores 100 surround the axis of the rotor core 1000, and a placement groove 1001 is formed between adjacent rotor cores 1000. The rotor core 1000 of the present utility model can be formed by stacking a plurality of rotor punching sheets 10. The rotor core 1000 is arranged circumferentially and uniformly to form a plurality of placement grooves 1001 for placing magnets, thereby fixing the permanent magnets. This reduces the amount of rotor material used, lowers costs, and at the same time reduces magnetic leakage and improves the efficiency of the motor.

[0060] such as Figure 8 In some embodiments, the width dimension of the placement groove 1001 along the circumferential direction of the rotor core 1000 is w4, and the width dimension of the portion of the bridge portion 12 extending out of the first side surface 1101 is w1, where 0.05 ≤ w1 / w4 ≤ 0.5. For example, w1 / w4 can be set to 0.05, 0.1, 0.25, 0.45, 0.5, etc. Through this setting, the structural strength of the rotor core 1000 can be improved.

[0061] In some embodiments, the rotor core 1000 further includes a rotor inner core. The rotor inner core is disposed inside the plurality of rotor outer cores 100. The rotor inner core has a shaft hole, and the rotor inner core is separated from the rotor outer cores 100. By providing the rotor inner core to connect the rotating shaft and separating the rotor outer cores 100 from the rotor inner core, insulation between the rotor outer cores 100 and the rotating shaft can be achieved, the stability of the rotor core 1000 can be improved, and magnetic leakage can be reduced.

[0062] The present utility model also provides a motor, which includes the aforementioned rotor outer core 100; or includes the aforementioned rotor core 1000. The present utility model also provides a household appliance, which includes the aforementioned rotor outer core 100; or includes the aforementioned rotor core 1000; or includes the aforementioned motor.

[0063] In the description of the present utility model, it should be understood that 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. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are 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 thus should not be construed as a limitation of the present utility model.

[0064] 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, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0065] In the present utility model, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "connected to", "fixed" and the like shall be construed 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.

[0066] 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", "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.

[0067] 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 may 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.

[0068] 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 punching sheet (10) for a rotor core (1000), characterized in that: The invention comprises a punching sheet body (11) and a bridge portion (12) connecting the punching sheet body (11), wherein the punching sheet body (11) has a first side surface (1101) and a second side surface (1102) opposite to each other along the circumference of a rotor core (1000), and the bridge portion (12) extends along the circumference and protrudes from the first side surface (1101), and the size of the bridge portion (12) protruding from the second side surface (1102) is 0 or smaller than the size of the bridge portion (12) protruding from the first side surface (1101).

2. The rotor punching (10) according to claim 1, characterized in that: The punching sheet body (11) has an inner end and an outer end opposite to each other in the radial direction of the rotor core (1000), and the bridge portion (12) is connected to the inner end.

3. The rotor punching sheet (10) according to claim 1, characterized in that: The portion of the bridge portion (12) extending out of the first side surface (1101) includes a first surface (1201), a second surface (1202) and an end surface (1203), wherein the first surface (1201) and the second surface (1202) are opposite to each other along the radial direction of the rotor core (1000), and the end surface (1203) connects the first surface (1201) and the second surface (1202). Wherein, the first surface (1201) and the second surface (1202) are parallel to each other, and the end surface (1203) is perpendicular to the first surface (1201) and the second surface (1202); and / or, the end surface (1203) is set to be an outwardly convex arc surface; and / or, the first surface (1201) and the first side surface (1101) are used together to position the magnetic tile, and the first surface (1201) and the first side surface (1101) are perpendicular.

4. The rotor punching (10) according to claim 1, characterized in that: The portion of the bridge portion (12) extending out of the first side surface (1101) is configured in a straight strip shape, an arc-shaped strip shape, or a fishhook shape.

5. The rotor punching (10) according to claim 1, characterized in that: The width dimension of the bridge portion (12) extending out of the first side surface (1101) along the circumferential direction is w1, the maximum width dimension of the punch body (11) along the circumferential direction is w2, and the minimum width dimension of the punch body (11) along the circumferential direction is w3, wherein 0.01≤w1 / w2≤0.2; and / or 0.2≤w1 / w3≤3; And / or, the height dimension of the portion of the bridge portion (12) extending out of the first side surface (1101) along the radial direction of the rotor core (1000) is h1, and the height dimension of the rotor punching sheet (10) along the radial direction is h2, wherein 0.01≤h1 / h2≤0.

2.

6. The rotor punching (10) according to claim 1, characterized in that The punch body (11) is provided with an injection hole (1103).

7. A rotor outer core (100), characterized in that: The invention comprises a plurality of rotor punching sheets (10) according to any one of claims 1 to 6, wherein the plurality of rotor punching sheets (10) are stacked along the axial direction of the rotor outer core (100).

8. The rotor outer core (100) according to claim 7, characterized in that: The plurality of rotor punching sheets (10) include a first punching sheet (110) and a second punching sheet (120), wherein the orientation of the first side surface (1101) of the first punching sheet (110) is opposite to the orientation of the first side surface (1101) of the second punching sheet (120).

9. The rotor outer core (100) according to claim 8, characterized in that: The second punch (120) is provided between at least two of the first punches (110), and a groove is constructed between the parts of the bridge parts (12) of the at least two first punches (110) extending out of the first side surface (1101); or, the plurality of rotor punches (10) include a first punch group and a second punch group, the first punch group and the second punch group are arranged alternately, the first punch group includes at least one first punch (110), and the second punch (120) includes at least one second punch (120); or, the first punch (110) and the second punch (120) have the same shape and size, or, the first punch (110) and the second punch (120) are set to be symmetrical to each other.

10. A rotor core (1000), characterized in that: It comprises a plurality of rotor outer cores (100) according to any one of claims 7 to 9, wherein the plurality of rotor outer cores (100) surround the axis of the rotor core (1000), and placement grooves (1001) are constructed between adjacent rotor cores (1000).

11. The rotor core (1000) according to claim 10, characterized in that: The width dimension of the placement groove (1001) along the circumferential direction of the rotor core (1000) is w4, and the width dimension of the portion of the bridge portion (12) extending out of the first side surface (1101) is w1, wherein 0.05≤w1 / w4≤0.5; And / or, the rotor core (1000) further comprises a rotor inner core, the rotor inner core is arranged on the inner side of the plurality of rotor outer cores (100), the rotor inner core has an axial hole, and the rotor inner core is separated from the rotor outer core (100).

12. A motor, characterized in that: The invention comprises the rotor outer core (100) according to any one of claims 7 to 9; or comprises the rotor core (1000) according to claim 10 or 11.

13. A household appliance, characterized in that: It comprises the rotor outer core (100) according to any one of claims 7 to 9; or, comprises the rotor core (1000) according to claim 10 or 11; or, comprises the motor according to claim 12.

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