Rotor assembly, motor and household appliance

Abstract

The utility model discloses a rotor assembly, a motor and a household electrical appliance, the rotor assembly comprises a plastic magnetic filling part, a yoke part and a plurality of magnetic shoes, and the plurality of magnetic shoes are circumferentially arranged around the rotation axis of the rotor assembly; the plastic magnetic filling part is at least filled between the outer side walls of two adjacent magnetic shoes, and the plurality of magnetic shoes are fixedly connected through the plastic magnetic filling part and form an annular structure; the yoke part is arranged on the outer sides of the plurality of magnetic shoes and the plastic magnetic filling part, and the yoke part is in contact with the outer side walls of the magnetic shoes and / or the plastic magnetic filling part. According to the utility model, the plastic magnetic filling part has a certain magnetic property, so that two adjacent magnetic shoes can be connected into a whole to serve as a magnetic source. The plastic magnetic filling part can provide a part of magnetic flux path, homogenize the magnetic field distribution of the yoke part and reduce the magnetic saturation degree of the yoke part; in addition, magnetic performance loss caused by air between the outer side walls of two adjacent magnetic shoes can be compensated, magnetic leakage at gaps of the magnetic shoes can be reduced, magnetic lines of force of the magnetic shoes are gathered on the side where the air gaps of the motor are located, and the power density of the motor is improved.

Description

Technical Field

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

[0002] With the miniaturization and lightweighting of permanent magnet motors, stronger magnetic properties are required from the magnets. Among related technologies, surface-mounted permanent magnet motors with external rotors suffer from problems such as high leakage flux, low power density, and easy rotor yoke saturation. Improving motor performance often requires increasing the outer diameter of the motor and the thickness of the magnets, which is detrimental to the miniaturization and lightweighting of permanent magnet motors. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a rotor assembly that can improve the power density of a motor.

[0004] In a first aspect, embodiments of this application provide a rotor assembly, including a plurality of magnetic tiles arranged circumferentially around the rotation axis of the rotor assembly; a plastic magnetic filling portion, which fills at least between the outer sidewalls of two adjacent magnetic tiles, wherein the plurality of magnetic tiles are fixedly connected through the plastic magnetic filling portion to form an annular structure; and a yoke portion disposed on the outside of the plurality of magnetic tiles and the plastic magnetic filling portion, wherein the yoke portion contacts the outer sidewall of the magnetic tiles and / or the plastic magnetic filling portion.

[0005] The rotor assembly according to the first aspect of this utility model has at least the following beneficial effects: the plastic magnetic filling part has certain magnetic properties, and the plastic magnetic filling part connects two adjacent magnetic tiles to form an integral magnetic source. The plastic magnetic filling part can serve as a partial magnetic flux path for two adjacent magnetic tiles, thereby homogenizing the magnetic field distribution of the yoke on the outer side of the magnetic tile and reducing the magnetic saturation of the yoke; it can also compensate for the magnetic properties lost due to the air gap between the outer walls of two adjacent magnetic tiles; at the same time, it can reduce the magnetic leakage phenomenon at the gap between two adjacent magnetic tiles, so that the magnetic lines of force of the magnetic tile are concentrated on the side near the air gap of the motor, increasing the air gap magnetic flux density, thereby increasing the power density of the motor.

[0006] According to the first aspect, in one possible implementation, the plastic magnetic filling portion includes a plurality of plastic magnets, which are filled one-to-one between two adjacent magnetic tiles; or, the plastic magnetic filling portion is annular and covers the outer sidewall of the plurality of magnetic tiles.

[0007] According to the first aspect, in one possible implementation, the outer wall of the plastic magnetic filling part is configured as a cylindrical surface or a multi-segment arc surface centered on the rotation axis; the radius of the outer wall of the plastic magnetic filling part is R1; the maximum distance between the outer wall of the magnetic tile and the rotation axis is D1, wherein R1≥D1.

[0008] According to the first aspect, in one possible implementation, the inner wall of the plastic magnetic filling portion includes a plurality of concave surfaces; each of the concave surfaces is in contact with at least a portion of the outer wall of the corresponding magnetic tile.

[0009] According to the first aspect, in one possible implementation, two adjacent magnetic tiles are spaced apart; the inner wall of the plastic magnetic filling portion further includes a toothed portion protruding toward the rotation axis, the toothed portion filling the gap between two adjacent magnetic tiles.

[0010] According to the first aspect, in one possible implementation, the minimum distance between the inner wall of the plastic magnetic filling portion and the rotation axis is D2, and the distance between the circumferential end of the magnetic tile and the rotation axis is D3, wherein D2≥D3.

[0011] According to the first aspect, in one possible implementation, the magnetic pole angle corresponding to the magnetic tile is α, the outer wall of the magnetic tile is an outer arc surface, and the center of the outer arc surface is a first point, the distance between the first point and the rotation axis is H, and the radius of the outer arc surface is R2; in the direction perpendicular to the radial central axis of the magnetic tile, the width of the magnetic tile is L.

[0012] The inner wall of the magnetic tile is an inner arc surface, and the inner arc surface is centered on the rotation axis, with a radius of R3.

[0013] Among them, 2R3sin(α / 2)<L<2(H+R2)sin(α / 2).

[0014] According to the first aspect, in one possible implementation, at least one end of the magnetic tile protrudes from the plastic magnetic filling portion along the direction of the rotation axis.

[0015] According to the first aspect, in one possible implementation, the yoke is a rotor yoke, which is tangent to the outer wall of the magnetic tile and fits against the outer wall of the plastic magnetic filling portion; or,

[0016] There is a gap between the rotor yoke and the outer wall of the magnetic tile, the plastic magnetic filling part covers the outer wall of the plurality of magnetic tiles, and the outer wall of the plastic magnetic filling part is in contact with the rotor yoke.

[0017] According to the first aspect, in one possible implementation, the plastic magnetic filling portion and the yoke portion are connected as an integral plastic magnetic component.

[0018] Secondly, embodiments of this application also provide an electric motor, the electric motor including a stator assembly and a rotor assembly as described in the first aspect, the stator assembly being disposed within the rotor assembly.

[0019] The motor according to the present invention has at least the following beneficial effects: by filling the outer side wall of the adjacent magnetic tiles with plastic magnetic filling part, the magnetic lines of force of the magnetic tiles are further concentrated on the side near the air gap of the motor, thereby increasing the power density of the motor without increasing the outer diameter of the motor; thus, while achieving the same motor performance, the size of the motor can be made smaller, which is conducive to the miniaturization and lightweight development of the motor.

[0020] Thirdly, embodiments of this application also provide a household appliance, the household appliance including the motor described in the second aspect.

[0021] The household appliance according to the present utility model has at least the following beneficial effects: by filling the outer wall of the adjacent magnetic tile with a plastic magnetic filling part, the magnetic lines of force of the magnetic tile are further concentrated on the side near the air gap of the motor, thereby increasing the power density of the motor without increasing the outer diameter of the motor; thus, while achieving the same motor performance, the size of the motor can be made smaller, which is conducive to the miniaturization and lightweight development of the motor and makes full use of the internal installation space of the household appliance.

[0022] 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

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a schematic diagram of the rotor assembly in one embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the rotor assembly in another embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the magnetic tile in an embodiment of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the plastic magnetic filling part in an embodiment of this utility model;

[0028] Figure 5 This is a schematic diagram of the rotor assembly in another embodiment of the present invention;

[0029] Figure 6 This is a comparison diagram of the back electromotive force of the motor in this embodiment and the motor with a traditional magnetic tile structure.

[0030] Figure label:

[0031] 100. Rotor assembly; 110. Magnet tile; 111. Outer arc surface; 112. Inner arc surface; 120. Plastic magnet filling part; 121. Plastic magnet body; 122. Toothed part; 130. Yoke part;

[0032] O1, axis of rotation; O2, first point. Detailed Implementation

[0033] 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.

[0034] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0035] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0036] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0037] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. 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.

[0038] In a first aspect, this application provides a rotor assembly. For example... Figure 1As shown, in some embodiments, the rotor assembly 100 includes a plastic magnetic filling portion 120, a yoke portion 130, and a plurality of magnetic tiles 110. The plurality of magnetic tiles 110 are arranged circumferentially around the rotation axis O1 of the rotor assembly 100, that is, the plurality of magnetic tiles 110 are arranged circumferentially around the rotation axis O1. The plurality of magnetic tiles 110 form alternating magnetic poles along the circumferential direction of the rotor assembly 100, thereby forming a magnetic field that interacts with the stator assembly. The plastic magnetic filling portion 120 fills at least between the outer sidewalls of two adjacent magnetic tiles 110. The plurality of magnetic tiles 110 are fixedly connected by the plastic magnetic filling portion 120 to form a ring structure. The plastic magnetic filling portion 120 fixes the plurality of magnetic tiles 110 into an integral structure through its own adhesiveness or the mechanical strength after curing, thereby reducing the relative movement between the magnetic tiles 110 and improving the overall rigidity and stability of the rotor assembly 100. The yoke 130 is located on the outside of the annular structure formed by the magnetic tile 110 and the plastic magnetic filling part 120, and contacts the outer wall of the magnetic tile 110 or the plastic magnetic filling part 120, or contacts both the outer wall of the magnetic tile 110 and the plastic magnetic filling part 120.

[0039] In this embodiment, the plastic magnetic filling portion 120 has certain magnetic properties. The plastic magnetic filling portion 120 connects two adjacent magnetic tiles 110 to form a whole and serves as a magnetic source. The yoke portion 130 is the main magnetic flux path between two adjacent magnetic tiles 110. The plastic magnetic filling portion 120 can serve as a partial magnetic flux path between two adjacent magnetic tiles 110, thereby homogenizing the magnetic field distribution of the yoke portion 130 located outside the magnetic tile 110, reducing the magnetic saturation of the yoke portion 130, and compensating for the magnetic properties lost due to the air gap between the outer walls of two adjacent magnetic tiles 110. At the same time, it can also reduce the magnetic leakage phenomenon at the gap between two adjacent magnetic tiles 110, so that the magnetic lines of force of the magnetic tile 110 are concentrated on the side near the air gap of the motor, increasing the air gap magnetic density and thus improving the power density of the motor.

[0040] When the rotor assembly 100 in this embodiment is applied to a motor, the magnetic lines of force of the magnetic tiles 110 are further concentrated on the side near the air gap of the motor by filling the outer side wall of the adjacent magnetic tiles 110 with plastic magnetic filling part 120, thereby increasing the power density of the motor without increasing the outer diameter of the motor. Therefore, the size of the motor can be reduced while achieving the same motor performance, which is conducive to the miniaturization and lightweight development of motors.

[0041] It should be noted that the axial and circumferential directions in this application are based on the rotor assembly 100, that is, the axial direction and the circumferential direction of the rotor assembly 100.

[0042] The plastic magnetic filling part 120 can be formed by pressing plastic magnetic material with magnetic tiles 110 arranged according to a preset pattern as inserts. Specifically, multiple magnetic tiles 110 are precisely positioned and fixed by a mold to arrange them according to a preset pattern. Then, plastic magnetic material is filled into the gaps between adjacent magnetic tiles 110. This process uses compression molding technology to encapsulate multiple magnetic tiles 110 into a complete structure.

[0043] Compared to the traditional method of inserting magnet tiles 110 one by one into their respective positions during motor assembly, this application uses a plastic magnetic filling part 120 to encapsulate multiple magnet tiles 110 into a single unit. The magnet tiles 110 are fixed and arranged during the pressing process, which simplifies the motor assembly method, shortens the motor assembly cycle time, and improves production efficiency. Furthermore, by eliminating the step of inserting magnet tiles 110, the corresponding equipment and manpower investment can be reduced.

[0044] The magnetic plastic material can be PA6 composite functional material, PA12 composite functional material, or other magnetic conductive materials. This application does not limit this.

[0045] When arranging the magnetic tiles 110, the mold typically has a limiting structure that engages with the gap between adjacent magnetic tiles 110 to prevent circumferential displacement. Therefore, the rotor assembly 100 typically has gaps between its multiple magnetic tiles 110. These gaps provide the necessary space for the limiting structure during manufacturing to ensure the positional accuracy of the magnetic tiles 110. Understandably, with advancements in assembly processes, other positioning methods can be employed to bring the circumferential ends of adjacent magnetic tiles 110 into contact; this embodiment does not limit this approach.

[0046] In some embodiments, such as Figure 1 and Figure 2 As shown, the yoke 130 can be a rotor yoke, located outside the magnet 110, with the plastic magnetic filling portion 120 filling the space between the magnet 110 and the rotor yoke. The rotor yoke serves as a magnetic flux path for the magnet 110, ensuring effective magnetic flux concentration in the motor's air gap. The plastic magnetic filling portion 120 can connect two adjacent magnets 110 into a single unit, acting as a magnetic source; it can also serve as a partial magnetic flux path for two adjacent magnets 110, thereby reducing the magnetic saturation of the rotor yoke. Using magnets 110 of the same specifications, the radial thickness of the rotor yoke can be reduced, saving material and lowering the motor's material costs.

[0047] The rotor yoke is typically made of a magnetically conductive metal, but other magnetically conductive materials can also be used. In this embodiment, only the rotor yoke and the plastic magnetic filling part 120 are defined as independent structures, and the material of the rotor yoke is not limited.

[0048] In the first example of the above embodiment, the rotor yoke is tangent to the outer wall of the magnetic tile 110, and the rotor yoke is in contact with the outer wall of the plastic magnetic filling part 120. The shape of the inner wall of the rotor yoke is not the same as the shape of the outer wall of the magnetic tile 110. The outer wall of the magnetic tile 110 is in tangential contact with the inner wall of the rotor yoke, providing a continuous, low-resistance path for magnetic flux. The remaining part of the outer wall of the magnetic tile 110 has a gap with the inner wall of the rotor yoke. The plastic magnetic filling part 120 fills the gap, that is, the space between the outer wall of the magnetic tile 110 and the inner wall of the rotor yoke is filled by the plastic magnetic filling part 120 to form another magnetic flux path, reducing the air gap in the magnetic flux path outside the magnetic tile 110 and improving the magnetic flux transmission efficiency.

[0049] In practical applications, plastic magnetic filling portions 120 are first pressed between adjacent magnetic tiles 110. Multiple magnetic tiles 110 are then connected via these plastic magnetic filling portions 120 to form a ring structure. The rotor yoke is fitted over this ring structure, providing additional structural support for the rotor assembly 100. By installing the rotor yoke on the outside of the ring structure, the entire rotor assembly 100 can be limited and reinforced. This helps prevent vibration and loosening problems that may occur with the plastic magnetic filling portions 120 and magnetic tiles 110 during motor operation. The presence of the rotor yoke improves the stability of the rotor assembly 100, ensuring the reliability of the motor under high speed or long-term operation.

[0050] In the first example above, such as Figure 1 , Figure 3 and Figure 4 As shown, the plastic magnet filling part 120 may include a plurality of plastic magnets 121, which are filled one-to-one between two adjacent magnetic tiles 110. This ensures that the gap between the magnetic tiles 110 is fully utilized, compensates for the magnetic performance lost due to the air gap between the outer walls of two adjacent magnetic tiles 110, and also reduces magnetic leakage at the gap between two adjacent magnetic tiles 110. This causes the magnetic lines of force of the magnetic tiles 110 to concentrate on the side near the air gap of the motor, increasing the air gap magnetic density and thus improving the power density of the motor.

[0051] In order to achieve the fit between the outer wall of the plastic magnetic filling part 120 and the inner wall of the rotor yoke, the outer wall of the plastic magnetic filling part 120 is configured as a multi-segment arc surface with the rotation axis O1 as the center; the radius of the outer wall of the plastic magnetic filling part 120 is equal to the radius of the inner wall of the rotor yoke; this design theoretically allows the plastic magnetic filling part 120 to form a continuous and seamless contact with the rotor yoke in the radial direction, thereby optimizing the magnetic flux path and enhancing structural stability.

[0052] Furthermore, the radius of the outer wall of the plastic magnetic filling part 120 is R1, and the maximum distance between the outer wall of the magnetic tile 110 and the rotation axis O1 is D1, R1=D1. At this time, the size of the rotor yoke is the minimum value allowed by the current magnetic tile 110 specification, which is beneficial to reduce the overall size and weight of the motor while maintaining efficient magnetic flux transmission.

[0053] In the second example of the above embodiment, there is a gap between the rotor yoke and the outer wall of the magnetic tile 110. The plastic magnetic filling portion 120 covers the outer wall of the plurality of magnetic tiles 110, and the outer wall of the plastic magnetic filling portion 120 is in contact with the inner wall of the rotor yoke. In this case, the outer wall of the plastic magnetic filling portion 120 is continuous, and the plastic magnetic filling portion 120 is pressed into contact with the outer wall of the magnetic tile 110. Similar to the first example, the second example can also reduce the air gap in the magnetic flux path outside the magnetic tile 110, thereby improving the magnetic flux transmission efficiency.

[0054] In the second example, such as Figure 1 , Figure 3 and Figure 4 As shown, the plastic magnetic filling portion 120 is annular and covers the outer walls of multiple magnetic tiles 110. This design ensures that the magnetic tiles 110 are completely enclosed, reducing magnetic leakage at the gaps between adjacent magnetic tiles 110 and enhancing structural stability. The outer wall of the plastic magnetic filling portion 120 is configured as a cylindrical surface centered on the rotation axis O1. The radius of the outer wall of the plastic magnetic filling portion 120 is equal to the radius of the inner wall of the rotor yoke, allowing the plastic magnetic filling portion 120 to form a continuous and seamless contact with the rotor yoke in the radial direction, thereby optimizing the magnetic flux path and enhancing structural stability.

[0055] Furthermore, the radius of the outer wall of the plastic magnetic filling part 120 is R1, and the maximum distance between the outer wall of the magnetic tile 110 and the rotation axis O1 is D1, where R1 > D1. For a single magnetic tile 110, the plastic magnetic filling part 120 can cover the entire outer wall of the magnetic tile 110, and the plastic magnetic filling part 120 has a certain thickness along the radial direction of the rotor assembly 100. Through the covering effect of the plastic magnetic filling part 120, multiple magnetic tiles 110 are completely encapsulated into one piece, preventing the magnetic tiles 110 from radially falling off due to centrifugal force during motor operation.

[0056] In other embodiments, such as Figure 5As shown, the yoke 130 and the plastic magnetic filling part 120 can be an integral plastic magnetic component, that is, the plastic magnetic component formed by compression molding includes the yoke 130 and the plastic magnetic filling part 120. By increasing the radial dimension of the plastic magnetic filling part 120, a yoke 130 with a certain thickness is formed on the outside of the magnetic tile 110, realizing the function of the rotor yoke. The plastic magnetic component directly serves as a structural support and provides a magnetic flux path. By omitting the rotor yoke, the structure of the rotor assembly 100 is simplified, the internal space layout of the motor is optimized, and the motor design can be made more compact.

[0057] In some embodiments, such as Figure 1 , Figure 3 and Figure 4 As shown, the minimum distance between the inner wall of the plastic magnetic filling part 120 and the rotation axis O1 is D2, and the distance between the circumferential end of the magnetic tile 110 and the rotation axis O1 is D3, where D2 ≥ D3. Since the outer wall of the magnetic tile 110 is an arc surface, under normal circumstances, the position of the plastic magnetic filling part 120 corresponding to the position between two adjacent magnetic tiles 110 is the minimum distance between the inner wall of the plastic magnetic filling part 120 and the rotation axis O1. By comparing the relationship between D2 and D3, the positional relationship between the plastic magnetic filling part 120 and the magnetic tile 110 can be determined.

[0058] The surface of the magnetic tile 110 includes an inner wall, an outer wall, and two transition sections connecting the two ends of the inner wall and the two ends of the outer wall. There is typically a gap between the transition sections of two adjacent magnetic tiles 110. In this embodiment, the distance between the circumferential end of the magnetic tile 110 and the rotation axis O1 refers to the distance between the circumferential end of the inner wall of the magnetic tile 110 and the rotation axis O1. For two adjacent magnetic tiles 110, the left end of one magnetic tile 110 is adjacent to the right end of the other magnetic tile 110, thus the distances between the two circumferential ends of the inner wall of the magnetic tile 110 and the rotation axis O1 should be equal.

[0059] The distance between the two ends of the outer side wall of the magnetic tile 110 along the circumferential direction and the rotation axis O1 is D4.

[0060] In the first example of the above embodiment, when D2≥D4, the inner sidewall of the plastic magnetic filling part 120 includes multiple concave surfaces; each concave surface is in contact with at least a portion of the outer sidewall of the corresponding magnetic tile 110. That is, the plastic magnetic filling part 120 can completely cover the outer sidewall of the magnetic tile 110, or it can cover a portion of the outer sidewall of the magnetic tile 110. This can compensate for the loss of magnetic properties due to air gaps between the outer sidewalls of two adjacent magnetic tiles 110, and also reduce magnetic leakage at the gaps between two adjacent magnetic tiles 110. This allows the magnetic lines of force of the magnetic tile to concentrate on the side near the air gap of the motor, increasing the air gap magnetic flux density and thus improving the power density of the motor.

[0061] In this case, D2 < D1, thereby ensuring that the plastic magnetic filling part 120 is at least in contact with a portion of the outer wall of the magnetic tile 110, providing the necessary magnetic flux path and structural support.

[0062] In the second example of the above embodiment, when D3≤D2<D4, the inner wall of the plastic magnetic filling part 120 is divided into two parts. One part consists of multiple concave surfaces, each of which completely fits the outer wall of the corresponding magnetic tile 110. The other part consists of toothed portions 122 protruding towards the rotation axis O1, which fill the gap between two adjacent magnetic tiles 110. That is, the plastic magnetic filling part 120 fills the gap between two adjacent magnetic tiles 110 to the maximum extent; the design of the toothed portions 122 can maintain the gap between adjacent magnetic tiles 110 and prevent the magnetic tiles 110 from loosening due to vibration or external force.

[0063] Understandably, the plastic magnetic filling part 120 is formed by pressing. Depending on the different depths at which the limiting structure in the mold is inserted into the gap between two adjacent magnetic tiles 110, the plastic magnetic filling part 120 and the magnetic tile 110 can have the above-mentioned different assembly situations.

[0064] When the ends of two adjacent magnetic tiles 110 in the circumferential direction are in contact, D2≥D4, the inner wall of the plastic magnetic filling part 120 includes a plurality of concave surfaces; each concave surface is in contact with at least a portion of the outer wall of the corresponding magnetic tile 110.

[0065] From another perspective, in some embodiments, such as Figure 1 , Figure 3 and Figure 4 As shown, the plastic magnetic filling part 120 may include a plurality of plastic magnetic bodies 121. The plurality of plastic magnetic bodies 121 are independent of each other. Each plastic magnetic body 121 includes an outer side wall and two inner side walls. The outer side wall of the plastic magnetic body 121 is an arc surface. The outer side wall of the plastic magnetic body 121 is centered on the rotation axis O1 and connects the center line of the outer side walls of two adjacent magnetic tiles 110. The inner side wall on the left side of the plastic magnetic body 121 is attached to the right half of the outer side wall of the left magnetic tile 110, and the inner side wall on the right side of the plastic magnetic body 121 is attached to the left half of the outer side wall of the right magnetic tile 110.

[0066] The plastic magnet 121 has a toothed portion 122 protruding away from the outer side wall, the toothed portion 122 filling the gap between two adjacent magnetic tiles 110.

[0067] In some embodiments, such as Figure 1 , Figure 3 and Figure 4As shown, the magnetic pole angle corresponding to the magnetic tile 110 is α. The outer wall of the magnetic tile 110 is an outer arc surface 111, and the center of the outer arc surface 111 is the first point O2. The distance between the first point O2 and the rotation axis O1 is H, and the radius of the outer arc surface 111 is R2. In the direction perpendicular to the radial central axis of the magnetic tile 110, the width of the magnetic tile is L. The inner wall of the magnetic tile 110 is an inner arc surface 112, and the inner arc surface 112 is centered on the rotation axis O1, and the radius of the inner arc surface 112 is R3. That is, the outer wall and the inner wall of the magnetic tile 110 are not concentric arc surfaces.

[0068] Among these, 2R3sin(α / 2)<L<2(H+R2)sin(α / 2) ensures that the magnetic tile 110 has sufficient width to provide greater magnetic properties. H<R3 means that the center of the outer arc surface 111 is located on the side of the inner arc surface 112 facing the rotation axis O1, and is positioned between the inner arc surface 112 and the rotation axis O1, controlling the degree of protrusion of the outer arc surface 111. Furthermore, 0.34≤R2 / H≤0.42 ensures that the magnetic tile 110 has better magnetic properties.

[0069] Each magnetic tile 110 corresponds to a magnetic pole, and the edge of the central angle corresponding to the range of the magnetic pole is the edge of the magnetic pole angle corresponding to the magnetic tile 110. Taking an example of N magnetic tiles 110 uniformly distributed circumferentially, the maximum angle of a magnetic pole is α. max α max = 360 / 2P, where P is the number of pole pairs of the motor, and α≤α max The sides of the magnetic pole angle corresponding to magnetic tile 110 refer to the two sides of a central angle with the radial axis of magnetic tile 110 as the center and the rotation axis O1 as the axis of rotation, and an angle of α. When α = α max When the ends of two adjacent magnetic tiles 110 are in contact, the edge of the magnetic pole angle corresponding to the magnetic tile 110 refers to the line connecting the contact point of the magnetic tile 110 with the two magnetic tiles 110 on both sides and the rotation axis O1.

[0070] That is, the magnetic tile 110 can be a reverse-faced magnetic tile, and the outer arc surface 111 of the reverse-faced magnetic tile 110 can be used to enhance the magnetic flux gathering effect of the air gap of the motor and improve the motor performance.

[0071] In some embodiments, such as Figure 2 and Figure 5 As shown, the magnetic tile 110 protrudes from at least one end of the plastic magnetic filling portion 120 along the axial direction. The portion of the magnetic tile 110 at least covered by the plastic magnetic filling portion 120 is the effective portion, capable of forming a magnetic field and rotating under the action of the stator assembly. The magnetic tile 110 may protrude from only one end of the plastic magnetic filling portion 120 along the axial direction, or it may protrude from both ends of the plastic magnetic filling portion 120. The fit, positioning, and installation with the external structure can be achieved by the shape of the magnetic tile 110 itself or the spacing between adjacent magnetic tiles 110.

[0072] In some embodiments, the rotor assembly 100 further includes a covering (not shown) that encapsulates the magnet 110, the plastic magnet filling portion 120, and any possible rotor yoke using thermosetting plastic PBT, thereby improving the overall structural strength of the rotor assembly 100 and ensuring the safety of the rotor during high-speed heavy-load operation.

[0073] In some embodiments, the rotor assembly 100 further includes a rotor housing and a shaft. The rotor housing is typically a cylindrical structure and is mounted to the inner wall surface of the rotor housing via a cover, thereby forming a surface-mount rotor assembly 100. The shaft is connected to the rotor housing and is used to connect to an external load to achieve energy conversion and transfer. The rotor housing and shaft are conventional configurations in the art and will not be described in detail in this application.

[0074] Secondly, this application also provides an electric motor. In some embodiments, the motor includes a stator assembly and a rotor assembly 100 as described in the first aspect, with the stator assembly disposed within the rotor assembly 100. The stator assembly includes a stator core and windings. When an energizing current flows through the windings, a rotating magnetic field is generated around the stator core. This rotating magnetic field interacts with the magnetic field generated by the magnets 110 in the rotor assembly 100, thereby generating a torsional torque. This torsional torque causes the rotor assembly 100 to begin rotating, thereby driving the load of the motor.

[0075] By filling the outer sidewalls of adjacent magnetic tiles 110 with plastic magnetic filler 120, the magnetic lines of force of the magnetic tiles 110 are further concentrated on the side near the air gap of the motor, thereby increasing the power density of the motor without increasing the outer diameter of the motor. Thus, while achieving the same motor performance, the size of the motor can be made smaller, which is conducive to the miniaturization and lightweight development of the motor.

[0076] like Figure 6 As shown, Figure 6 A comparison diagram of the back electromotive force (EMF) of the motor provided by this invention and that of a motor with a conventional 110 magnetic tile structure is shown. The motor provided by this invention has a 14.3% higher no-load back EMF than the motor with a conventional 110 magnetic tile structure, which can improve the motor's power density and reduce its cost.

[0077] The motor may also include conventional components such as end caps, heat sinks, and seals, which will not be described in detail in this application.

[0078] Thirdly, this application also provides a household appliance. In some embodiments, the household appliance includes a motor according to the second aspect. By filling the outer walls of adjacent magnetic tiles 110 with plastic magnetic filler portions 120, the magnetic lines of force of the magnetic tiles 110 are further concentrated on the side near the air gap of the motor, thereby increasing the power density of the motor without increasing the outer diameter of the motor; thus, while achieving the same motor performance, the size of the motor can be made smaller, which is conducive to the miniaturization and lightweight development of the motor, and makes full use of the internal installation space of the household appliance.

[0079] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A rotor assembly characterized by, The rotor assembly comprises: a plurality of magnetic tiles arranged circumferentially around an axis of rotation of the rotor assembly; a plastic magnetic filler part at least filled between the outer sidewalls of two adjacent magnetic tiles, the plurality of magnetic tiles being fixedly connected by the plastic magnetic filler part and forming a ring structure; a yoke part provided on the outside of the plurality of magnetic tiles and the plastic magnetic filler part, and the yoke part being in contact with the outer sidewalls of the magnetic tiles and / or the plastic magnetic filler part.

2. The rotor assembly of claim 1, wherein The plastic magnetic filler part comprises a plurality of plastic magnets, each of which is filled between two adjacent magnetic tiles; or The plastic magnetic filler part is annular, and the plastic magnetic filler part covers the outer sidewalls of the plurality of magnetic tiles.

3. The rotor assembly of claim 2, wherein, The outer sidewall of the plastic magnetic filler part is configured as a cylindrical surface or a multi-segment arc surface with the axis of rotation as the center; the radius of the outer sidewall of the plastic magnetic filler part is R1; The maximum distance between the outer sidewall of the magnetic tile and the axis of rotation is D1, wherein R1≥D1.

4. The rotor assembly of claim 1, wherein The inner sidewall of the plastic magnetic filler part comprises a plurality of concave surfaces; each of the concave surfaces is in contact with at least part of the outer sidewall of the corresponding magnetic tile.

5. The rotor assembly of claim 4, wherein Two adjacent magnetic tiles are arranged with a spacing therebetween; The inner sidewall of the plastic magnetic filler part further comprises a tooth-shaped part protruding towards the axis of rotation, and the tooth-shaped part is filled in the spacing between two adjacent magnetic tiles.

6. The rotor assembly of claim 1, wherein The minimum distance between the inner sidewall of the plastic magnetic filler part and the axis of rotation is D2, and the distance between the circumferential end of the magnetic tile and the axis of rotation is D3, wherein D2≥D3.

7. The rotor assembly of any one of claims 1 to 6, wherein, The corresponding magnetic pole angle of the magnetic tile is α, the outer sidewall of the magnetic tile is an outer arc surface, and the center of the outer arc surface is a first point, the distance between the first point and the axis of rotation is H, and the radius of the outer arc surface is R2; in the direction perpendicular to the radial central axis of the magnetic tile, the width of the magnetic tile is L; The inner sidewall of the magnetic tile is an inner arc surface, and the inner arc surface has the axis of rotation as the center, and the radius of the inner arc surface is R3; Wherein, 2R3sin(α / 2)<L<2(H+R2)sin(α / 2).

8. The rotor assembly of any one of claims 1 to 6, wherein, One end of the magnetic tile protrudes from the plastic magnetic filler part at least in the direction of the axis of rotation.

9. The rotor assembly of claim 1, wherein The yoke part is a rotor yoke, the rotor yoke is tangent to the outer sidewall of the magnetic tile, and the rotor yoke is in contact with the outer sidewall of the plastic magnetic filler part; or There is a spacing between the rotor yoke and the outer sidewall of the magnetic tile, the plastic magnetic filler part covers the outer sidewall of the plurality of magnetic tiles, and the outer sidewall of the plastic magnetic filler part is in contact with the rotor yoke.

10. The rotor assembly of claim 1, wherein The plastic magnetic filler part and the yoke part are connected as an integrated plastic magnetic part.

11. An electric machine characterized by The rotor assembly comprises: The rotor assembly of any one of claims 1 to 10; A stator assembly is provided in the rotor assembly.

12. A domestic appliance characterized in that, The motor comprises the rotor assembly of claim 11.

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