Rotor structure, electric machine and household appliance

Abstract

The utility model discloses a rotor structure, motor and household electrical appliances, rotor structure includes: rotor core, rotor core has a plurality of magnetic steel groove that interval along the circumferential direction of rotor core, magnetic steel, magnetic steel is a plurality, a plurality of magnetic steel is located in a plurality of magnetic steel groove respectively, injection molding part, and rotor core and magnetic steel are connected through injection molding part injection molding, and injection molding part has first injection molding part and second injection molding part respectively located rotor core axial two sides, and at least one of the surface of first injection molding part and second injection molding part away from each other has a plurality of balance groove that interval along the circumferential direction of rotor core, and balance groove is used for placing balance peg. According to the rotor structure of the utility model, it is convenient to correct the dynamic balance when directly assembling the balance peg into the balance groove, the dynamic balance of the rotor structure can be adjusted through the balance peg, and the balance peg is arranged in the balance groove, the assembly of the balance peg is facilitated, and the efficiency of dynamic balance correction can be improved.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and in particular to a rotor structure, motor and household appliance equipment. Background Technology

[0002] In related technologies, motors are core components of home appliances, and the requirements for their energy efficiency and performance are becoming increasingly stringent. As a result, brushless DC motors are increasingly used in home appliances. Currently, the dynamic balancing of the permanent magnet rotor of brushless DC motors mainly relies on manual application of balancing clay for correction, which is slow and unreliable. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a rotor structure that can improve the efficiency of dynamic balancing correction.

[0004] This utility model also proposes an electric motor, which includes the rotor structure described above.

[0005] This utility model also proposes a household appliance, which includes the aforementioned motor.

[0006] The rotor structure according to an embodiment of the present invention includes: a rotor core having a plurality of magnet slots spaced apart along the circumferential direction of the rotor core; a plurality of magnets respectively disposed in the plurality of magnet slots; and an injection molded part having the rotor core and the magnets injection molded together, the injection molded part having a first injection molded part and a second injection molded part located on opposite axial sides of the rotor core, at least one of the surfaces of the first injection molded part and the second injection molded part facing away from each other having a plurality of balance slots spaced apart along the circumferential direction of the rotor core, the balance slots being used to place balance pins.

[0007] According to the rotor structure of this utility model embodiment, the rotor core and magnet are connected by injection molding through injection molding parts, and the injection molding parts have a first injection molding part and a second injection molding part located on both sides of the rotor core axially. At least one of the surfaces of the first injection molding part and the second injection molding part facing away from each other has a plurality of balance grooves spaced apart along the circumferential direction of the rotor core. The balance grooves are used to place balance pins, which facilitates the direct assembly of balance pins into the balance grooves when correcting dynamic balance. The dynamic balance of the rotor structure can be adjusted by the balance pins, and placing the balance pins in the balance grooves facilitates the assembly of the balance pins and can improve the efficiency of dynamic balance correction.

[0008] According to some embodiments of the present invention, on the same side of the rotor core in the axial direction, a plurality of the balancing slots are evenly spaced along the circumferential direction of the rotor core.

[0009] According to some embodiments of the present invention, both the first injection molded part and the second injection molded part have the balance groove, and the balance groove on the first injection molded part and the balance groove on the second injection molded part are symmetrically arranged.

[0010] According to some embodiments of the present invention, the balance pin and the balance groove are interference-fitted.

[0011] According to some embodiments of the present invention, it further includes: a rotor shaft, which passes through the radial inner side of the rotor core, and the rotor shaft is injection molded to the rotor core and the magnet through the injection molded part.

[0012] According to some embodiments of the present invention, the rotor core includes a plurality of core units spaced apart along the circumferential direction of the rotor core, and the magnetic slot is formed between two adjacent core units.

[0013] In some embodiments of this utility model, the core unit is provided with a first limiting structure on at least one side of the two sides along the circumferential direction of the rotor core at the outer end along the radial direction of the rotor core; and / or, the core unit is provided with a second limiting structure on at least one side of the two sides along the circumferential direction of the rotor core at the inner end along the radial direction of the rotor core.

[0014] In some embodiments of this utility model, the core unit is provided with an injection groove that extends through the axial direction of the rotor core, and the injection molded part has a third injection molded part located in the injection groove.

[0015] The motor according to an embodiment of the present invention includes the rotor structure described above.

[0016] According to the embodiment of the present invention, the motor, by setting the above-described rotor structure, allows the rotor core and magnets to be connected by injection molding through injection molding parts. The injection molding parts have a first injection molding part and a second injection molding part located on both sides of the rotor core along the axial direction. At least one of the surfaces of the first injection molding part and the second injection molding part facing away from each other has a plurality of balance grooves spaced apart along the circumferential direction of the rotor core. The balance grooves are used to place balance pins, which facilitates the direct assembly of balance pins into the balance grooves during dynamic balancing. The dynamic balance of the rotor structure can be adjusted by the balance pins, and placing the balance pins in the balance grooves facilitates the assembly of the balance pins and can improve the efficiency of dynamic balancing correction.

[0017] The household appliance according to the present invention includes the motor described above.

[0018] According to the embodiments of the present invention, the household appliance is equipped with the above-mentioned motor, which includes the above-mentioned rotor, such that the rotor core and the magnet are connected by injection molding through injection molding. The injection molding has a first injection molding and a second injection molding respectively located on both sides of the rotor core axially. At least one of the surfaces of the first injection molding and the second injection molding facing away from each other has a plurality of balance grooves spaced apart along the circumferential direction of the rotor core. The balance grooves are used to place balance pins, which facilitates the direct assembly of the balance pins into the balance grooves when correcting the dynamic balance. The dynamic balance of the rotor structure can be adjusted by the balance pins, and placing the balance pins in the balance grooves facilitates the assembly of the balance pins and can improve the efficiency of dynamic balance correction.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a perspective view of the rotor structure according to an embodiment of the present utility model; Figure 2 This is a top view of the rotor structure according to an embodiment of the present utility model; Figure 3 This is a side view of the rotor structure according to an embodiment of the present utility model; Figure 4 This is an exploded view of the rotor structure according to an embodiment of the present utility model; Figure 5 This is a cross-sectional view of the rotor structure according to an embodiment of the present utility model; Figure 6 This is a top view of the rotor structure according to an embodiment of the present invention from another angle.

[0021] Figure label: 100. Rotor structure; 1. Rotor core; 11. Magnet slot; 12. Core unit; 121. First limiting structure; 122. Second limiting structure; 123. Injection molding tank; 2. Magnet; 3. Injection molded part; 31. First injection molded part; 32. Second injection molded part; 321. Balancing groove; 33. Third injection molded part; 34. Fourth injection molded part; 35. Fifth injection molded part; 4. Balancing pins; 5. Rotor shaft. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein 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 accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] In the description of this 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," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] The rotor structure 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0025] like Figure 1 and Figure 4 As shown, the rotor structure 100 according to an embodiment of the present utility model includes a rotor core 1, a magnet 2, and an injection molded part 3.

[0026] Specifically, the rotor core 1 has multiple magnet slots 11 spaced apart along the circumferential direction of the rotor core 1, and multiple magnets 2 are respectively disposed in the multiple magnet slots 11. (Reference) Figure 5 As shown, the magnet slot 11 is generally rectangular in shape in the cross-section perpendicular to the axial direction of the rotor core 1, and the magnet 2 is also generally rectangular in shape in the cross-section perpendicular to the axial direction of the rotor core 1. Furthermore, each corner of the magnet 2 is rounded in the cross-section perpendicular to the axial direction of the rotor core 1, as shown in the reference diagram. Figure 4As shown, the two surfaces of the magnet 2 facing each other along the axial direction of the rotor core 1 and the two surfaces of the magnet 2 facing each other along the circumferential direction of the rotor core 1 both have rounded corners.

[0027] The rotor core 1 and magnet 2 are connected by injection molding via injection molded part 3. During the fabrication of the rotor structure 100, magnet 2 is assembled into the magnet slot 11 of the rotor core 1. Then, the assembled rotor core 1 and magnet 2 are placed in the mold cavity, and injection molding material is injected into the cavity. After the injection molding material solidifies, injection molded part 3 is formed. Injection molded part 3 fills the gap between the rotor core 1 and magnet 2, as well as both sides of the rotor core 1 in the axial direction. This facilitates the fixed connection of the rotor core 1 and magnet 2 into a single unit. (Refer to...) Figure 6 .

[0028] like Figures 2-4 As shown, the injection molded part 3 has a first injection molded part 31 and a second injection molded part 32 located on both sides of the rotor core 1 in the axial direction. At least one of the surfaces of the first injection molded part 31 and the second injection molded part 32 facing away from each other has a plurality of balance grooves 321 spaced apart along the circumferential direction of the rotor core 1. The balance grooves 321 are used to place balance pins 4. It is understandable that the balancing groove 321 may be provided only on the surface of the first injection molded part 31 facing away from the second injection molded part 32, and there may be multiple balancing grooves 321, which are spaced apart along the circumferential direction of the rotor core 1. Alternatively, the balancing groove 321 may be provided only on the surface of the second injection molded part 32 facing away from the first injection molded part 31, and there may be multiple balancing grooves 321, which are spaced apart along the circumferential direction of the rotor core 1. Or, multiple balancing grooves 321 may be provided on both the surface of the first injection molded part 31 facing away from the second injection molded part 32 and the surface of the second injection molded part 32 facing away from the first injection molded part 31, which are spaced apart along the circumferential direction of the rotor core 1.

[0029] The balancing groove 321 is used to place the balancing pins 4. During dynamic balancing, the balancing pins 4 are directly assembled into the balancing groove 321 by detecting the imbalance. The dynamic balance of the rotor structure 100 can be adjusted using the balancing pins 4. The placement of the balancing pins 4 within the balancing groove 321 is convenient, quick, and efficient, improving the efficiency of dynamic balancing correction. Furthermore, the balancing grooves 321 are located on the injection-molded part 3 and are formed during the injection molding process, eliminating the need for separate processing, saving steps, and improving production efficiency. Since the injection-molded part 3 is made of plastic, a greater number of balancing grooves 321 can be placed on it, resulting in a smaller angle between the center of two adjacent balancing grooves 321 and the line connecting them to the axis of the rotor core 1. This increases the density of the balancing grooves 321, making it easier to adjust the dynamic balance of the rotor structure 100.

[0030] According to the rotor structure 100 of this utility model embodiment, the rotor core 1 and the magnet 2 are connected by injection molding through injection molding part 3. The injection molding part 3 has a first injection molding part 31 and a second injection molding part 32 located on both sides of the axial direction of the rotor core 1. At least one of the surfaces of the first injection molding part 31 and the second injection molding part 32 facing away from each other has a plurality of balance grooves 321 spaced apart along the circumferential direction of the rotor core 1. The balance grooves 321 are used to place balance pins 4, so that the balance pins 4 can be directly assembled into the balance grooves 321 when correcting the dynamic balance. The dynamic balance of the rotor structure 100 can be adjusted by the balance pins 4. And by placing the balance pins 4 in the balance grooves 321, it is convenient to assemble the balance pins 4, which can improve the efficiency of dynamic balance correction.

[0031] In some embodiments of this utility model, such as Figure 2 As shown, on the same side of the rotor core 1 in the axial direction, multiple balancing slots 321 are evenly spaced along the circumferential direction of the rotor core 1. It can be understood that the distance between any two adjacent balancing slots 321 along the circumferential direction of the rotor core 1 is the same. This facilitates the correction of the dynamic balance of the rotor structure 100 using the balancing pins 4.

[0032] In some embodiments of this utility model, such as Figure 6 As shown, both the first injection molded part 31 and the second injection molded part 32 have balancing grooves 321, which are symmetrically arranged. It can be understood that the number of balancing grooves 321 on the first injection molded part 31 and the second injection molded part 32 is the same, and the multiple balancing grooves 321 on the first injection molded part 31 and the multiple balancing grooves 321 on the second injection molded part 32 are respectively arranged opposite to each other along the axial direction of the rotor core 1. This facilitates the correction of the dynamic balance of the rotor structure 100 using the balancing pins 4.

[0033] In some embodiments of this utility model, such as Figure 6 As shown, the balance pin 4 and the balance groove 321 are interference-fitted. When assembling the balance pin 4, the balance pin 4 can be directly pressed into the balance groove 321, which facilitates the assembly of the balance pin 4 and improves the reliability of the connection between the balance pin 4 and the injection molded part 3, preventing the balance pin 4 from falling off during motor operation.

[0034] In some embodiments of this utility model, such as Figure 3 and Figure 6 As shown, the rotor structure 100 also includes a rotor shaft 5, which passes through the radial inner side of the rotor core 1. The rotor shaft 5 is injection molded to the rotor core 1 and the magnet 2. The injection molded part 3 is filled between the rotor shaft and the rotor core 1 and between the rotor shaft and the magnet 2, which simplifies the assembly process of the rotor shaft 5 and improves the connection reliability between the rotor shaft 5 and the rotor core 1.

[0035] In some embodiments of this utility model, such as Figure 4 and Figure 5 As shown, the rotor core 1 includes multiple core units 12 spaced apart along the circumferential direction of the rotor core 1, with magnetic slots 11 formed between adjacent core units 12. The multiple core units 12 are completely separated along the circumferential direction of the rotor core 1. During assembly, the multiple core units 12 and magnets 2 are alternately arranged along the circumferential direction of the rotor core 1. The multiple core units 12 and magnets 2 are injection molded into a single unit using an injection molding part 3. The magnets 2 and the rotor core 1 are connected by the non-magnetic plastic injection molding part 3, which reduces magnetic leakage, avoids short circuits in the magnetic field, allows the magnetic field to pass through the motor air gap as much as possible, fully utilizes the performance of the magnets 2, and improves the efficiency of the motor.

[0036] Each core unit 12 includes multiple lamination units stacked along the axial direction of the rotor core 1, and the lamination units of two adjacent core units 12 are not connected to each other.

[0037] In some embodiments of this utility model, such as Figure 4 and Figure 5 As shown, at least one side of the core unit 12 along the circumferential direction of the rotor core 1 has a first limiting structure 121 at its outer end along the radial direction of the rotor core 1. It can be understood that the first limiting structure 121 may be provided at one side of the core unit 12 along the circumferential direction of the rotor core 1 at its outer end along the radial direction of the rotor core 1, or the first limiting structure 121 may be provided at the outer ends of both sides of the core unit 12 along the circumferential direction of the rotor core 1 at its outer end along the radial direction of the rotor core 1. For example, in... Figure 4 and Figure 5 In the example shown, the core unit 12 is provided with a first limiting structure 121 at the outer ends of both sides of the rotor core 1 in the radial direction of the rotor core 1 along the circumferential direction.

[0038] Therefore, the magnet 2 located in the magnet slot 11 can be limited to prevent the magnet 2 from coming out in the radial direction of the rotor core 1, which can improve the strength of the rotor structure 100 after injection molding and increase the pull-out force of the rotor core 1.

[0039] In some embodiments of this utility model, such as Figure 4 and Figure 5 As shown, at least one side of the core unit 12 along the circumferential direction of the rotor core 1 has a second limiting structure 122 at its inner end along the radial direction of the rotor core 1. It can be understood that the second limiting structure 122 may be provided at one side of the core unit 12 along the circumferential direction of the rotor core 1 at its inner end along the radial direction of the rotor core 1, or the second limiting structure 122 may be provided at the inner ends of both sides of the core unit 12 along the circumferential direction of the rotor core 1 at its inner end along the radial direction of the rotor core 1. For example, in... Figure 4and Figure 5 In the example shown, the inner ends of the core unit 12 on both sides of the rotor core 1 in the radial direction of the rotor core 1 in the circumferential direction are provided with a second limiting structure 122.

[0040] Therefore, the magnet 2 located in the magnet slot 11 can be limited to prevent the magnet 2 from moving inward along the radial direction of the rotor core 1, which can improve the strength of the rotor structure 100 after injection molding.

[0041] In some embodiments of this utility model, such as Figure 4 and Figure 5 As shown, the core unit 12 is provided with an injection groove 123 that extends through the rotor core 1 along the axial direction, and the injection molded part 3 has a third injection molded part 33 located within the injection groove 123. This can improve the reliability of the connection between the injection molded part 3 and the core unit 12, and can better connect multiple core units 12 together.

[0042] Furthermore, such as Figure 4 and Figure 5 As shown, a fourth injection molded part 34 is also filled between the first limiting structures 121 of two adjacent iron core units 12 that are close to each other. A fifth injection molded part 35 is filled between the rotor shaft 5 and the rotor iron core 1, and between the rotor shaft 5 and the magnet 2.

[0043] In some embodiments of this utility model, such as Figure 2 As shown, the cross-section of the balancing groove 321 is circular. Of course, this utility model is not limited to this, and the cross-section of the balancing groove 321 can also be other polygons, etc.

[0044] The following describes a motor according to an embodiment of the present invention.

[0045] The motor according to an embodiment of the present invention includes the rotor structure 100 described above.

[0046] In addition, the motor also includes a stator structure, which is sleeved outside the rotor structure 100, and the rotor structure 100 is rotatable relative to the stator structure.

[0047] According to the embodiment of the present invention, the motor is provided with the rotor structure 100 described above, so that the rotor core 1 and the magnet 2 are connected by injection molding through injection molding part 3. The injection molding part 3 has a first injection molding part 31 and a second injection molding part 32 located on both sides of the axial direction of the rotor core 1. At least one of the surfaces of the first injection molding part 31 and the second injection molding part 32 facing away from each other has a plurality of balance grooves 321 spaced apart along the circumferential direction of the rotor core 1. The balance grooves 321 are used to place balance pins 4, so that the balance pins 4 can be directly assembled into the balance grooves 321 when correcting the dynamic balance. The dynamic balance of the rotor structure 100 can be adjusted by the balance pins 4. And by placing the balance pins 4 in the balance grooves 321, it is convenient to assemble the balance pins 4, which can improve the efficiency of dynamic balance correction.

[0048] The following describes a household appliance according to an embodiment of the present invention.

[0049] The household appliance according to the present invention includes the motor described above.

[0050] According to the embodiments of the present invention, the household appliance is equipped with the above-mentioned motor, which includes the above-mentioned rotor structure 100, such that the rotor core 1 and the magnet 2 are connected by injection molding through injection molding part 3. The injection molding part 3 has a first injection molding part 31 and a second injection molding part 32 located on both sides of the axial direction of the rotor core 1. At least one of the surfaces of the first injection molding part 31 and the second injection molding part 32 facing away from each other has a plurality of balance grooves 321 spaced apart along the circumferential direction of the rotor core 1. The balance grooves 321 are used to place balance pins 4, so that the balance pins 4 can be directly assembled into the balance grooves 321 when correcting the dynamic balance. The dynamic balance of the rotor structure 100 can be adjusted by the balance pins 4, and the balance pins 4 are placed in the balance grooves 321 to facilitate the assembly of the balance pins 4 and improve the efficiency of dynamic balance correction.

[0051] In some embodiments of this utility model, the household appliances can be various types of household appliances such as air conditioners, refrigerators, ovens, and blenders.

[0052] Other components and operations of the household appliances and motors according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0054] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A rotor structure, characterized in that, include: A rotor core having a plurality of magnetic slots spaced apart along the circumferential direction of the rotor core; The magnets are multiple, and the multiple magnets are respectively disposed in multiple magnet slots; The rotor core and the magnet are connected by injection molding through the injection molding part. The injection molding part has a first injection molding part and a second injection molding part located on both sides of the rotor core in the axial direction. At least one of the surfaces of the first injection molding part and the second injection molding part facing away from each other has a plurality of balance grooves spaced apart along the circumferential direction of the rotor core. The balance grooves are used to place balance pins.

2. The rotor structure according to claim 1, characterized in that, On the same side of the rotor core in the axial direction, a plurality of the balancing slots are evenly spaced along the circumferential direction of the rotor core.

3. The rotor structure according to claim 1, characterized in that, Both the first injection molded part and the second injection molded part have the balance groove, and the balance groove on the first injection molded part and the balance groove on the second injection molded part are symmetrically arranged.

4. The rotor structure according to claim 1, characterized in that, The balance pin is interference-fitted with the balance groove.

5. The rotor structure according to claim 1, characterized in that, Also includes: The rotor shaft passes through the radial inner side of the rotor core, and the rotor shaft is connected to the rotor core and the magnet by injection molding through the injection molded part.

6. The rotor structure according to any one of claims 1-5, characterized in that, The rotor core includes a plurality of core units spaced apart along the circumferential direction of the rotor core, and the magnetic slot is formed between two adjacent core units.

7. The rotor structure according to claim 6, characterized in that, The core unit is provided with a first limiting structure on at least one side of the two sides along the circumferential direction of the rotor core and at the outer end of the radial direction of the rotor core. And / or, the core unit has a second limiting structure on at least one side of the two sides along the circumferential direction of the rotor core at the inner end along the radial direction of the rotor core.

8. The rotor structure according to claim 6, characterized in that, The core unit is provided with an injection groove that extends through the axial direction of the rotor core, and the injection molded part has a third injection molded part located within the injection groove.

9. An electric motor, characterized in that, Includes the rotor structure according to any one of claims 1-8.

10. A household appliance, characterized in that, Includes the motor according to claim 9.

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