Outer rotor assembly, motor and household appliance

Abstract

The utility model discloses an external rotor assembly, a motor and a household electrical appliance, and relates to the technical field of motors, the external rotor assembly comprises a housing, a magnetic ring, a magnetic yoke and a magnetic attraction portion, the housing comprises an annular side portion; the magnet ring and the magnet yoke are arranged on the inner side of the annular side part, the magnet ring and the magnet yoke are both annularly arranged, and the magnet yoke is arranged on the periphery of the magnet ring in a sleeving mode; the magnetic attraction part is arranged on the shell, and the magnetic attraction part is connected with the magnetic ring in a magnetic attraction manner; when the magnetic ring is unstable in size and cannot be tightly matched with the magnetic yoke to realize torque transmission, the magnetic ring can be magnetically attracted and fixed through the magnetic attraction part, the magnetic ring is prevented from being separated from the magnetic yoke, then torque transmission can be realized, and the problems that an existing magnetic ring is unstable in size and cannot be tightly matched with the magnetic yoke to realize torque transmission are solved. And power cannot be effectively transmitted to fan blades.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to an outer rotor assembly, a motor and a household appliance. Background Art

[0002] In the home appliance and automotive industries, miniaturization, weight reduction, and noise reduction of motors have long been key research and development areas. Currently, most external rotor motors utilize tile-shaped sintered ferrite magnets, magnetic strips made of soft composite materials, and ring-shaped magnets pressed with nylon adhesive. During the assembly process of these motors, glue is often used to secure the magnets to the outer rotor's yoke. Plastic magnetic rings, made with a polyamide (PA) substrate as a binder, are susceptible to moisture absorption due to their material properties, influenced by ambient humidity. This can affect the dimensional stability of the magnetic rings. Furthermore, when the device operates under high temperature conditions, the absorbed moisture within the magnetic rings evaporates, causing volume shrinkage, which can lead to loosening between the magnetic rings and motor components. If this occurs, the magnetic rings will no longer effectively transmit power to the fan blades, ultimately causing the fan to fail. Utility Model Content

[0003] The main purpose of the utility model is to provide an outer rotor assembly, a motor and a household appliance, aiming to solve the problem that the existing magnetic ring is unstable in size and cannot effectively transmit power to the fan blades.

[0004] To achieve the above objectives, the outer rotor assembly proposed in the present invention includes:

[0005] a housing including an annular side portion;

[0006] A magnetic ring and a magnetic yoke are arranged on the inner side of the annular side portion, the magnetic ring and the magnetic yoke are both arranged in an annular shape, and the magnetic yoke is sleeved on the outer periphery of the magnetic ring; and

[0007] The magnetic attraction portion is provided on the shell, and the magnetic attraction portion is magnetically connected to the magnetic ring.

[0008] In one embodiment, a support portion is convexly provided on the inner side of the annular side portion;

[0009] The magnetic attraction portion is installed on one side of the support portion, and the magnetic yoke and the magnetic ring are installed on a side of the magnetic attraction portion away from the support portion.

[0010] In one embodiment, the magnetic attraction portion is arranged in a ring shape; and / or the support portion is arranged in a ring shape.

[0011] In one embodiment, the inner diameter of the magnetic attraction portion is set to be smaller than or equal to the inner diameter of the magnetic ring.

[0012] In one embodiment, one of the outer side surface of the magnetic attraction portion and the inner side surface of the annular side portion is provided with a first positioning groove, and the other is provided with a first positioning protrusion that cooperates with the first positioning groove.

[0013] In one embodiment, the magnetic ring and the magnetic yoke are interference fit; and / or,

[0014] The magnetic ring is bonded to the magnetic yoke.

[0015] In one embodiment, the magnetic ring includes an annular body and a convex portion protruding from an outer side surface of the annular body, and the convex portion is interference-fitted with the magnetic yoke.

[0016] In one embodiment, the convex portion extends along the axial direction of the annular body, and a guiding slope is provided at one end of the convex portion close to the magnetic attraction portion.

[0017] In one embodiment, the gap between the outer side surface of the annular body and the inner side surface of the yoke is set to be less than or equal to 0.25 mm; and / or,

[0018] The interference between the protrusion and the yoke is set to be less than or equal to 0.25 mm.

[0019] In one embodiment, one of the outer side surface of the yoke and the inner side surface of the annular side portion is provided with a second positioning groove, and the other is provided with a second positioning protrusion that cooperates with the second positioning groove.

[0020] The utility model further provides a motor, comprising an outer rotor assembly, wherein the outer rotor assembly comprises:

[0021] a housing including an annular side portion;

[0022] A magnetic ring and a magnetic yoke are arranged on the inner side of the annular side portion, the magnetic ring and the magnetic yoke are both arranged in an annular shape, and the magnetic yoke is sleeved on the outer periphery of the magnetic ring; and

[0023] The magnetic attraction portion is provided on the shell, and the magnetic attraction portion is magnetically connected to the magnetic ring.

[0024] The present invention further provides a household appliance, comprising a motor, the motor comprising an outer rotor assembly, the outer rotor assembly comprising:

[0025] a housing including an annular side portion;

[0026] A magnetic ring and a magnetic yoke are arranged on the inner side of the annular side portion, the magnetic ring and the magnetic yoke are both arranged in an annular shape, and the magnetic yoke is sleeved on the outer periphery of the magnetic ring; and

[0027] The magnetic attraction portion is provided on the shell, and the magnetic attraction portion is magnetically connected to the magnetic ring.

[0028] In the technical solution of the present invention, the magnetic yoke is sleeved on the periphery of the magnetic ring, the annular side portion of the shell is sleeved on the periphery of the magnetic yoke, and the magnetic attraction portion is provided on the shell to magnetically attract the magnetic ring so that the magnetic ring can be magnetically fixed to the shell. When the size of the magnetic ring is unstable and cannot form a tight fit with the magnetic yoke to achieve torque transmission, the magnetic ring can be magnetically fixed by the magnetic attraction portion to prevent the magnetic ring from separating from the magnetic yoke, thereby achieving torque transmission, thereby solving the problem that the existing magnetic ring is unstable in size and cannot effectively transmit power to the fan blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0030] Figure 1 This is a structural schematic diagram of an embodiment of an outer rotor assembly provided by the utility model;

[0031] Figure 2 for Figure 1 Schematic diagram of the structure of the middle magnetic yoke;

[0032] Figure 3 for Figure 1 Schematic diagram of the structure of the middle magnetic attraction part;

[0033] Figure 4 for Figure 1 Schematic diagram of the structure of the central magnetic ring.

[0034] Description of Figure Numbers:

[0035] 100. Outer rotor assembly; 1. Housing; 11. Annular side; 12. Support portion; 2. Magnetic ring; 21. Annular body; 22. Protrusion; 221. Guide slope; 3. Magnetic yoke; 3a. Second positioning groove; 4. Magnetic attraction portion; 4a. First positioning groove.

[0036] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0038] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] In the home appliance and automotive industries, miniaturization, weight reduction, and noise reduction of motors have long been key research and development areas. Currently, most external rotor motors utilize tile-shaped sintered ferrite magnets, magnetic strips made of soft composite materials, and ring-shaped magnets pressed with nylon adhesive. During the assembly process of these motors, glue is often used to secure the magnets to the outer rotor's yoke. Plastic magnetic rings, made with a polyamide (PA) substrate as a binder, are susceptible to moisture absorption due to their material properties, influenced by ambient humidity. This can affect the dimensional stability of the magnetic rings. Furthermore, when the device operates under high temperature conditions, the absorbed moisture within the magnetic rings evaporates, causing volume shrinkage, which can lead to loosening between the magnetic rings and motor components. If this occurs, the magnetic rings will no longer effectively transmit power to the fan blades, ultimately causing the fan to fail.

[0041] The utility model provides an outer rotor assembly to solve the problem that the existing magnetic ring has unstable dimensions and cannot effectively transmit power to fan blades.

[0042] See also Figure 1 In one embodiment of the present invention, the outer rotor assembly 100 includes a shell 1, a magnetic ring 2, a magnetic yoke 3 and a magnetic attraction portion 4, the shell 1 includes an annular side portion 11; the magnetic ring 2 and the magnetic yoke 3 are arranged on the inner side of the annular side portion 11, the magnetic ring 2 and the magnetic yoke 3 are both arranged in an annular shape, and the magnetic yoke 3 is sleeved on the outer periphery of the magnetic ring 2; the magnetic attraction portion 4 is provided in the shell 1, and the magnetic attraction portion 4 is magnetically connected to the magnetic ring 2.

[0043] It should be noted that the outer rotor assembly 100 is used in a motor. The motor generally includes a wind wheel, a yoke 3, a magnetic ring 2 and a coil. The yoke 3 is made of a magnetic conductive material (such as silicon steel sheet). Its main function is to provide a closed magnetic circuit to ensure that the magnetic field can be transmitted efficiently. The magnetic ring 2 is made of a permanent magnetic material (such as neodymium iron boron, ferrite, etc.) and is responsible for generating a fixed magnetic field. The magnetic ring 2 is installed on the inner side of the yoke 3. The wind wheel is fixedly connected to the yoke 3. When rotating, airflow can be generated to help the heat inside the motor dissipate faster. The wind wheel, magnetic ring 2 and yoke 3 together form the rotor part of the motor.

[0044] The coil, mounted inside the yoke 3 and wound with conductive wire, generates a changing magnetic field when current flows through it. The coil forms the stator portion of the motor. Changing the direction of the current changes the direction of the coil's magnetic field, which interacts with the magnetic field of the magnetic ring 2 to generate a driving torque, causing the rotor to rotate.

[0045] The magnetic yoke 3 is sleeved inside the annular side portion 11 and connected to the annular side portion 11. The magnetic ring 2 is sleeved inside the magnetic yoke 3. Glue is provided between the magnetic ring 2 and the magnetic yoke 3 to fix the two. When the size of the magnetic ring 2 changes due to environmental factors, there is a possibility that there is a gap between the magnetic ring 2 and the magnetic yoke 3. If the gap is too large and the glue no longer plays a bonding role, the magnetic ring 2 and the magnetic yoke 3 cannot form a whole. When the magnetic ring 2 rotates relative to the coil, the magnetic ring 2 cannot transmit torque to the magnetic yoke 3 and the wind wheel, causing the fan function to fail.

[0046] The magnetic attraction part 4 is arranged on the shell 1. The magnetic attraction part 4 refers to a component used to generate and utilize a magnetic field for adsorption, fixation or other functions. The magnetic attraction part 4 magnetically attracts the magnetic ring 2. When the bonding force between the magnetic ring 2 and the magnetic yoke 3 fails, the magnetic attraction part 4 can magnetically fix the magnetic ring 2 and can utilize the magnetic attraction force to make the magnetic ring 2 stationary relative to the magnetic yoke 3. When the magnetic ring 2 acts with the coil to generate a driving force, the magnetic ring 2 can transmit torque to the wind wheel, driving the entire outer rotor assembly 100 to rotate.

[0047] In the technical solution of the present invention, the magnetic yoke 3 is sleeved on the periphery of the magnetic ring 2, the annular side portion 11 of the shell 1 is sleeved on the periphery of the magnetic yoke 3, and the magnetic attraction portion 4 is provided on the shell 1 to magnetically attract the magnetic ring 2 so that the magnetic ring 2 can be magnetically fixed to the shell 1. When the size of the magnetic ring 2 is unstable and cannot form a tight fit with the magnetic yoke 3 to achieve torque transmission, the magnetic ring 2 can be magnetically fixed by the magnetic attraction portion 4 to prevent the magnetic ring 2 from separating from the magnetic yoke 3, thereby achieving torque transmission, thereby solving the problem that the existing magnetic ring 2 is unstable in size and cannot effectively transmit power to the fan blades.

[0048] It should also be noted that, because PA-based adhesives have good mechanical strength, wear resistance, chemical corrosion resistance, fluidity, and plasticity, the magnetic ring 2 is configured as a PA-based adhesive plastic ferrite material. PA-based adhesive plastic ferrite material refers to a composite material prepared by using polyamide (PA, nylon) as a binder, mixing ferrite magnetic powder and other additives, and then preparing it through injection molding or compression molding. However, due to its material properties, the plastic magnetic ring 2 is easily affected by the humidity of the surrounding environment and absorbs water, which affects the dimensional stability of the magnetic ring 2. In order to prevent the water absorbed by the magnetic ring 2 from evaporating and causing volume shrinkage when working under high temperature conditions, which may cause loosening between the magnetic ring 2 and the motor components, the magnetic ring 2 can be pretreated in this application. The specific pretreatment method is to place the magnetic ring 2 in a high-temperature oven and set an appropriate temperature (usually 100°C to 150°C) and time (ranging from a few hours to dozens of hours). The specific parameters are determined according to the actual material properties and application requirements. Specifically, in one embodiment, the device may be placed in a high temperature environment of 110° C. for about 48 hours.

[0049] By placing the magnetic ring 2 in a high temperature environment for a period of time, the evaporation of water can be accelerated, so that the moisture content inside the magnetic ring 2 reaches a low and stable level. In this way, even if different temperature and humidity environments are encountered during subsequent use, the dimensional change of the magnetic ring 2 will be greatly reduced.

[0050] During the injection or compression molding process, internal stress accumulates within the magnetic ring 2. This internal stress gradually releases at high temperatures, causing the material's molecular chains to relax and stabilize. After high-temperature treatment, the molecular chain structure within the magnetic ring 2 becomes more stable, reducing dimensional changes and deformation caused by internal stress, thereby improving dimensional stability.

[0051] For details, please refer to Figure 1 In this embodiment, a support portion 12 is convexly provided on the inner side of the annular side portion 11; the magnetic portion 4 is installed on one side of the support portion 12, and the yoke 3 and the magnetic ring 2 are installed on the side of the magnetic portion 4 away from the support portion 12.

[0052] It is understood that the support portion 12 is a portion protruding from the inner side of the annular side portion 11 and is used to support and fix other components. The support portion 12 provides a stable platform for installing the magnetic attraction portion 4.

[0053] The magnetic portion 4 is mounted on one side of the support portion 12 , and the magnetic ring 2 is mounted on the other side of the magnetic portion 4 , and together with the magnetic yoke 3 , is mounted on the side of the magnetic portion 4 away from the support portion 12 .

[0054] In this way, the magnetic ring 2, the magnetic yoke 3 and the magnetic attraction part 4 are in direct contact, and a magnetic connection is formed. When the magnetic ring 2 rotates relative to the coil, in addition to the magnetic attraction between the magnetic ring 2 and the magnetic attraction part 4, there is also friction between the magnetic ring 2 and the magnetic attraction part 4, so that the magnetic ring 2 can drive the entire outer rotor assembly 100 to rotate through the magnetic attraction part 4, thereby realizing the rotation or other functions of the motor.

[0055] Specifically, see Figure 1 and Figure 3 In this embodiment, the magnetic portion 4 is arranged in a ring shape; and / or the support portion 12 is arranged in a ring shape. The magnetic portion 4 is arranged in a ring shape, that is, the shape of the magnetic portion 4 is a complete ring or a nearly ring-shaped structure. The annular magnetic portion 4 can provide a more uniform and continuous magnetic field distribution, which is suitable for occasions where an omnidirectional magnetic field effect is required. The annular design allows the magnetic portion 4 to better adapt to compact spaces, save space, and can also be more easily installed on the inner side of the annular side portion 11 to ensure good fit with the support portion 12.

[0056] The annular support portion 12 is configured as an annular shape, which can provide more uniform support and reduce deformation or loosening caused by insufficient local support. The annular design allows the support portion 12 to better disperse stress and improve the stability of the overall structure.

[0057] By designing both the magnetic attraction portion 4 and the support portion 12 into an annular shape, optimal magnetic field distribution and structural stability can be achieved. The combination of the annular magnetic attraction portion 4 and the annular support portion 12 can ensure the uniformity of the magnetic field and the stability of the components, making it suitable for high-performance and high-reliability applications.

[0058] Specifically, see Figure 1In this embodiment, the inner diameter of the magnetic portion 4 is set to be less than or equal to the inner diameter of the magnetic ring 2. The relationship between the inner diameters of the magnetic portion 4 and the magnetic ring 2 helps to ensure a uniform distribution of the magnetic field. If the inner diameter of the magnetic portion 4 is larger than the inner diameter of the magnetic ring 2, it may cause uneven distribution of the magnetic field and affect the performance of the motor. The inner diameter of the magnetic portion 4 is less than or equal to the inner diameter of the magnetic ring 2, which can ensure that the path of the magnetic lines of force between the magnetic portion 4 and the magnetic ring 2 is smoother, reducing the leakage and loss of the magnetic lines of force.

[0059] Further, see Figure 3 In this embodiment, one of the outer side surface of the magnetic attraction portion 4 and the inner side surface of the annular side portion 11 is provided with a first positioning groove 4a, and the other is provided with a first positioning protrusion (not shown) that cooperates with the first positioning groove 4a.

[0060] Because a first positioning structure is provided between the outer surface of the magnetic attraction part 4 and the inner surface of the annular side part 11, that is, the first positioning groove 4a and the first positioning protrusion cooperate with each other, when the magnetic attraction part 4 tends to rotate relative to the annular side part 11 during the process of the magnetic ring 2 transmitting torque, the first positioning groove 4a and the first positioning protrusion can limit the relative rotation of the magnetic attraction part 4 relative to the annular side part 11.

[0061] It should be noted that the housing 1 is typically manufactured using injection molding. This involves placing the assembled yoke 3 and magnetic ring 2 into a custom mold, heating thermoplastic (or other suitable material) to a molten state, and injecting it into the mold cavity under high pressure. Under pressure, the plastic fills all voids within the mold, including the portion surrounding the yoke 3, forming a complete outer rotor assembly 100. The injected plastic solidifies after a period of cooling, forming a solid outer shell, which serves as the rotor and is tightly integrated with the yoke 3 to form a single unit.

[0062] Therefore, the first positioning groove 4 a is provided on the outer side surface of the magnetic attraction portion 4 . During the injection molding process, plastic flows into the first positioning groove 4 a and forms the first positioning protrusion after cooling and solidification.

[0063] Furthermore, in order to ensure a stable and secure connection between the magnetic ring 2 and the magnetic yoke 3, in this embodiment, the magnetic ring 2 and the magnetic yoke 3 are interference fit; and / or the magnetic ring 2 and the magnetic yoke 3 are bonded.

[0064] By providing interference fit between the magnetic ring 2 and the magnetic yoke 3 , the magnetic yoke 3 and the magnetic ring 2 are slightly deformed during assembly, thereby maximizing the contact area between the two and forming a very tight mechanical connection, thereby increasing the force between them.

[0065] The adhesive provides high bonding force, thereby increasing the bonding strength between the magnetic ring 2 and the magnetic yoke 3 and preventing them from loosening or falling off during operation.

[0066] Specifically, see Figure 1 and Figure 4 In this embodiment, the magnetic ring 2 includes an annular body 21 and a protrusion 22 protruding from the outer side of the annular body 21 , and the protrusion 22 is interference fit with the magnetic yoke 3 .

[0067] This arrangement creates an interference fit between the protrusion 22 and the yoke 3, concentrating the applied force on the protrusion 22 rather than distributing it uniformly across the entire contact surface. This concentrated force distribution improves local connection strength and reduces material deformation caused by a large-area interference fit. The protrusion 22 disperses stress, reducing local stress concentration caused by a large-area interference fit, thereby improving overall connection strength and reliability.

[0068] The design of the protrusion 22 can reduce the material usage of the magnetic ring 2 and the magnetic yoke 3 while ensuring the connection strength, thereby reducing the manufacturing cost, reducing the weight of the entire motor, and improving its portability and energy efficiency.

[0069] Furthermore, in order to facilitate the assembly of the magnetic ring 2 to the magnetic yoke 3, please refer to Figure 4 In this embodiment, the protrusion 22 extends along the axial direction of the annular body 21 , and a guiding inclined surface 221 is provided at one end of the protrusion 22 close to the magnetic attraction portion 4 .

[0070] The protrusion 22 includes a guide section and a holding section arranged in sequence in a direction away from the magnetic attraction portion 4. The guide section is provided with the guide slope 221, which is inclined outward in a direction approaching the holding section. In this way, the guide slope 221 smoothly guides the magnetic ring 2 into the inner hole of the magnetic yoke 3, reducing resistance and friction during assembly, making it easier to align and insert the magnetic ring 2. This reduces assembly difficulty, improves assembly accuracy, reduces assembly damage, and improves assembly efficiency.

[0071] It should also be noted that glue is provided in a narrow gap between the outer side surface of the annular body 21 and the inner side surface of the magnetic yoke 3 to strengthen the fastening between the magnetic ring 2 and the magnetic yoke 3 .

[0072] Specifically, in some embodiments, the gap between the outer side surface of the annular body 21 and the inner side surface of the yoke 3 is set to be less than or equal to 0.25 mm; and / or the interference between the protrusion 22 and the yoke 3 is set to be less than or equal to 0.25 mm.

[0073] If the interference fit between the protrusion 22 and the yoke 3 is set too large, it will increase the resistance during assembly, making it difficult for the magnetic ring 2 to be smoothly inserted into the inner hole of the yoke 3, increasing the difficulty of assembly. It may also cause the magnetic ring 2 or the yoke 3 to deform during assembly, affecting its geometric shape and dimensional accuracy. If the yield strength of the material is exceeded, the magnetic ring 2 or the yoke 3 may crack or even break, affecting its service life and reliability. Excessive local stress will be generated at the contact surface of the magnetic ring 2 and the yoke 3, leading to stress concentration and increasing the risk of fatigue failure.

[0074] Furthermore, in order to ensure the stability between the yoke 3 and the housing 1 in the circumferential direction, please refer to Figure 2 In this embodiment, one of the outer side surface of the yoke 3 and the inner side surface of the annular side portion 11 is provided with a second positioning groove 3a, and the other is provided with a second positioning protrusion (not shown) that cooperates with the second positioning groove 3a.

[0075] In this way, the second positioning groove 3a and the second positioning protrusion cooperate with each other. When the yoke 3 tends to rotate relative to the annular side portion 11 during the process of the magnetic ring 2 transmitting torque, the second positioning groove 3a and the second positioning protrusion can limit the relative rotation of the yoke 3 relative to the annular side portion 11.

[0076] Of course, the second positioning protrusion may be formed in the same manner as the first positioning protrusion.

[0077] The present invention also proposes a motor, which includes a stator assembly and an outer rotor assembly 100. The specific structure of the outer rotor assembly 100 refers to the above embodiment. Since this motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0078] The present utility model also provides a household appliance, which includes a compression cylinder and a motor. The specific structure of the motor refers to the above-mentioned embodiment. Since the household appliance adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0079] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An outer rotor assembly, characterized in that: include: a housing including an annular side portion; A magnetic ring and a magnetic yoke are arranged on the inner side of the annular side portion, the magnetic ring and the magnetic yoke are both arranged in an annular shape, and the magnetic yoke is sleeved on the outer periphery of the magnetic ring; and The magnetic attraction portion is provided on the shell, and the magnetic attraction portion is magnetically connected to the magnetic ring.

2. The outer rotor assembly according to claim 1, wherein: A supporting portion is convexly provided on the inner side of the annular side portion; The magnetic attraction portion is installed on one side of the support portion, and the magnetic yoke and the magnetic ring are installed on a side of the magnetic attraction portion away from the support portion.

3. The outer rotor assembly according to claim 2, wherein: The magnetic attraction portion is arranged in a ring shape; and / or the support portion is arranged in a ring shape.

4. The outer rotor assembly according to claim 3, wherein: The inner diameter of the magnetic attraction portion is set to be smaller than or equal to the inner diameter of the magnetic ring.

5. The outer rotor assembly according to claim 3, wherein: One of the outer side surface of the magnetic attraction portion and the inner side surface of the annular side portion is provided with a first positioning groove, and the other is provided with a first positioning protrusion that cooperates with the first positioning groove.

6. The outer rotor assembly according to claim 1, wherein: There is interference fit between the magnetic ring and the magnetic yoke; and / or, The magnetic ring is bonded to the magnetic yoke.

7. The outer rotor assembly according to claim 6, wherein: The magnetic ring includes an annular body and a convex portion convexly provided on the outer side surface of the annular body, and the convex portion is interference-fitted with the magnetic yoke.

8. The outer rotor assembly according to claim 7, wherein: The convex portion extends along the axial direction of the annular body, and a guiding inclined surface is provided at one end of the convex portion close to the magnetic attraction portion.

9. The outer rotor assembly according to claim 7, wherein: The gap between the outer side surface of the annular body and the inner side surface of the yoke is set to be less than or equal to 0.25 mm; and / or, The interference between the protrusion and the yoke is set to be less than or equal to 0.25 mm.

10. The outer rotor assembly according to claim 1, wherein: One of the outer side surface of the yoke and the inner side surface of the annular side portion is provided with a second positioning groove, and the other is provided with a second positioning protrusion that cooperates with the second positioning groove.

11. A motor, characterized in that: Comprising the outer rotor assembly according to any one of claims 1 to 10.

12. A household appliance, characterized in that: Comprising the motor as claimed in claim 11.

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