Rotor structure, motor and household appliance
By setting a spacer in the rotor structure of the surface-mounted permanent magnet motor, some welding wires are eliminated, and the problem of easy cracking in the plastic wrap of the rotor is solved and the overall strength is improved.
Patent Information
- Application Number
- CN202422048744.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-22
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-22
AI Technical Summary
During the rotor plastic wrapping process of the surface-mounted permanent magnet motor, cracks are prone to occur at the cover of the end of the rotor core, resulting in a decrease in overall strength.
A rotor structure is designed in which the rotor core has a plurality of through holes formed at its axial side end, a plastic seal covers the side end of the rotor core, and a spacer is provided between two adjacent through holes of the rotor core to eliminate some of the welded wires.
By eliminating some welding wires and installing spacers, the possibility of the plastic seal cracking under temperature impact load is reduced, and the overall strength of the rotor structure is improved.
Smart Images
Figure CN223039739U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motor rotors, and particularly relates to a rotor structure, a motor and a household appliance. Background Art
[0002] In the production process of the rotor of a surface-mounted permanent magnet motor, while the magnetic tile is coated and constrained on the circumferential side of the rotor core through rotor plastic coating, the end part of the rotor core also needs to be coated. However, under the temperature shock load, the rotor plastic coating is prone to cracking at the position between two adjacent through holes adjacent to the end part of the rotor core, which reduces the overall strength of the rotor. Summary of the Utility Model
[0003] The main purpose of the utility model is to propose a rotor structure, a motor and a household appliance, aiming to improve the situation that the rotor plastic coating is prone to cracking at the position between two adjacent through holes at the end part of the rotor core.
[0004] To achieve the above purpose, the rotor structure proposed by the utility model includes:
[0005] A rotor core part, having a side end in its axial direction, and a plurality of through holes are formed in the side end; and,
[0006] A plastic sealing body, at least covering the side end of the rotor core part, and an empty space part is penetrated through the plastic sealing body along the axial direction of the rotor core part, and the empty space part is arranged corresponding to the position between two adjacent through holes of the rotor core part.
[0007] In some embodiments, the plurality of through holes are arranged along the circumferential direction of the rotor core part;
[0008] The empty space part extends along the radial direction of the rotor core part.
[0009] In some embodiments, the plurality of empty space parts include a first empty space part, and the outer end of the first empty space part is spaced from the peripheral edge of the plastic sealing body to form a spaced area, and the plastic sealing body is provided with a rib protruding axially along the rotor core part corresponding to the spaced area.
[0010] In some embodiments, the rib is arranged in a strip shape, and the extending direction of the rib is consistent with the extending direction of the corresponding first empty space part.
[0011] In some embodiments, on the axial direction of the rotor core part, a ring-shaped protrusion is formed on the peripheral edge of the plastic sealing body departing from the side end of the rotor core part, wherein:
[0012] The inner end of the rib extends to be adjacent to the outer end of the first empty space part; and / or,
[0013] The outer end of the rib body extends to be connected to the inner wall of the annular protrusion.
[0014] In some embodiments, the plurality of spacers include a second spacer, and along the axial direction of the rotor core, the plastic package body is further provided with a first through hole, and the first through hole is arranged adjacent to the periphery of the plastic package body;
[0015] The outer end of the second spacer extends to communicate with the first through hole.
[0016] In some embodiments, in the axial direction of the rotor core, an annular protrusion is formed on the side end of the periphery of the plastic package body away from the rotor core;
[0017] The first through hole is disposed adjacent to the inner wall of the annular protrusion.
[0018] In some embodiments, a plug hole is further formed at the side end of the rotor core, the plug hole is used for plugging a balancing pin, and the plug hole is aligned and connected to the first through hole;
[0019] Wherein, the aperture of the first through hole is larger than the aperture of the insertion hole.
[0020] In some embodiments, the plurality of spacers include a first spacer, the outer end of the first spacer is arranged at a distance from the periphery of the plastic package body to form a spacer area, and the plastic package body is provided with a rib protruding in the axial direction of the rotor core corresponding to the spacer area;
[0021] A plurality of the first space portions and a plurality of the second space portions are provided respectively, and the plurality of the first space portions and the plurality of the second space portions are alternately provided along the circumferential direction of the rotor core.
[0022] In some embodiments, the plastic package body is formed with a second through hole in the middle of the side end of the rotor core;
[0023] The inner end of the spacer extends to communicate with the second through hole.
[0024] In some embodiments, in the axial direction of the rotor core, an annular protrusion is formed on the side end of the periphery of the plastic package body away from the rotor core;
[0025] The rotor structure further includes a magnet portion that is disposed on a circumferential side of the rotor core, and an end portion of the magnet portion in an axial direction of the rotor core is embedded in the annular protrusion.
[0026] In some embodiments, a side end of the magnet portion facing away from the rotor core is exposed from the plastic packaging body.
[0027] The present utility model also provides a motor, which includes the rotor structure as described in any one of the above.
[0028] The present utility model also provides a household appliance, which includes the above-mentioned motor.
[0029] In the technical solution of the present utility model, weld lines are likely to occur at the position of the plastic-sealed body corresponding to the position between two adjacent through holes on the rotor core. By forming a space portion at this position, at least part of the weld lines can be eliminated. Under the temperature shock load, the existence of the space portion reduces the degree of cracking of the plastic-sealed body at this position and improves the situation where cracks extend along the weld lines, ensuring the wrapping strength of the plastic-sealed body around the rotor core, that is, ensuring the overall strength of the rotor structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.
[0031] Figure 1 FIG. 1 is a schematic structural diagram of an embodiment of the rotor structure provided by the present utility model;
[0032] Figure 2 FIG. Figure 1 2 is a front view structural diagram of the rotor structure in FIG. 1;
[0033] Figure 3 FIG. Figure 2 3 is a schematic structural diagram of the cross-section A-A in FIG. 2.
[0034] DESCRIPTION OF THE REFERENCE NUMERALS IN THE DRAWINGS:
[0035] 100, rotor structure;
[0036] 1, rotor core; 11, through hole; 12, jack; 2, plastic-sealed body; 21, space portion; 211, first space portion; 212, second space portion; 22, first through hole; 23, second through hole; 24, annular protrusion; 25, rib; 3, magnet portion
[0037] The realization of the purpose, functional features and advantages of the present utility model will be further described in conjunction with the embodiments and with reference to the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0039] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0040] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, 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 quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.
[0041] During the production process of the rotor of a surface-mounted permanent magnet motor, while the magnetic tile is covered and constrained on the circumferential side of the rotor core through rotor plastic coating, it is also necessary to coat the end of the rotor core. During the process of coating the end of the rotor core, the plastic coating fluid will first be injected into multiple through-holes at the end of the rotor core (the through-holes usually exist as weight-reducing holes of the rotor core) to coat the inner wall of the through-holes, and then the plastic coating fluid overflows to the end face of the rotor core to coat the end of the rotor core. However, the plastic coating fluid overflowing from two adjacent through-holes will converge between the two through-holes, thus forming a weld line. The plastic strength of the rotor plastic coating at the weld line is only 40% to 95% of the plastic strength at other positions. Under the temperature shock load, the rotor plastic coating needs to withstand large temperature differences. Therefore, the rotor plastic coating is prone to cracking at the position of the weld line, which reduces the overall strength of the rotor.
[0042] Generally, there are three solutions to the problem of weld lines in the related art. One is to reduce the viscosity of the overmolding fluid so that the flow fronts of the overmolding fluid are more easily combined. The second is to increase the pressure when the flow fronts of the overmolding fluid are combined to promote their combination. The third is to improve the design of the injection mold and the product to reduce the convergence of the overmolding fluid. However, the above solutions are more difficult to implement in the production process of the rotor of a surface-mounted permanent magnet motor and require additional costs.
[0043] Analyzing the above problems, in the usage scenario of a surface-mounted permanent magnet motor, the rotor overmolding needs to withstand temperature shock loads, and the thermal expansion and contraction characteristics of its material itself will be amplified at the weld line, resulting in cracking. The cracks usually extend along the weld line, thus affecting the overall strength of the rotor. Therefore, it can be considered to eliminate the weld line by separating the two overmolding fluids between two through holes.
[0044] In view of this, the present utility model proposes a rotor structure, a motor, and a household appliance. It can be understood that as long as there are multiple through holes at the end of the rotor core and the side end of the rotor core is coated with an overmolding fluid, the above-mentioned problem of weld lines usually occurs. The rotor structure provided by the present utility model includes any rotor formed by the above overmolding process. Among them, the specific types of this rotor structure include but are not limited to SPM rotors or IPM rotors.
[0045] The proposed rotor structure aims to improve the situation where cracking easily occurs at the position between two adjacent through holes at the end of the rotor core corresponding to the rotor overmolding. Among them, Figure 1 is a schematic structural diagram of an embodiment of the rotor structure provided by the present utility model; Figure 2 is Figure 1 the front view structural diagram of the rotor structure in Figure 3 is Figure 2 the structural diagram of section A-A in
[0046] Please refer to Figures 1 to 3 , in an embodiment of the present utility model, the rotor structure 100 includes a rotor core 1 and a plastic encapsulation body 2. The rotor core 1 has a side end in its axial direction, and a plurality of through holes 11 are formed at the side end. The plastic encapsulation body 2 is at least disposed to cover the side end of the rotor core 1. Along the axial direction of the rotor core 1, an empty space portion 21 is provided through the plastic encapsulation body 2, and the empty space portion 21 is disposed corresponding to the position between two adjacent through holes 11 of the rotor core 1.
[0047] It should be noted that the material of the "rotor core 1" can have various situations, as long as the rotor core 1 has sufficient strength and magnetic permeability properties. For example, the rotor core 1 can include a rotor iron core; the axial direction of the rotor core 1 usually has two opposite side ends, and the through hole 11 can generally be understood as a hole that penetrates the two side ends and is used for weight reduction. To maintain the balance of the rotor core 1, multiple through holes 11 are usually evenly distributed on the rotor core 1. For example, two are symmetrically arranged with respect to the center of the rotor core 1, or two symmetric through holes 11 form a symmetric group, and multiple symmetric groups are arranged in the circumferential direction of the rotor core 1; the embodiment of the present utility model can make improvements only for one of the side ends, or can also make improvements for both side ends at the same time. It can be understood that as long as improvements are made for the side ends, it can be considered that contributions have been made to the situation that "cracking is likely to occur at the position between two adjacent through holes 11 at the end of the rotor iron core corresponding to the rotor plastic coating".
[0048] The function of the "plastic encapsulation body 2" is to encapsulate the rotor core 1, and its material usually uses thermosetting plastics, which usually have the properties of excellent performance, good molding processability, fast curing speed, and easy demolding. Thermosetting plastics cure in the hot state and do not deform or damage when used at high temperatures. There are mainly unsaturated polyester resin types and epoxy resin types. Stabilizers, lubricants, demolding agents, coloring agents, curing and curing accelerators, anti-aging agents, antistatic agents, anti-flame agents, etc. are usually added during use. The plastic encapsulation body 2 can be arranged to only encapsulate the side ends of the rotor core 1, or can also include the circumferential side of the rotor core 1 while encapsulating the side ends of the rotor core 1. This embodiment does not limit this.
[0049] The "spacing part 21" generally refers to a structure formed on the plastic encapsulation body 2 and penetrating through to the side end of the rotor core 1. It can be understood that the spacing part 21 is a hole formed on the plastic encapsulation body 2 and axially penetrating through to the rotor core 1. The spacing part 21 and the side end of the rotor core 1 enclose a groove; there are limitations on the setting position of the spacing part 21 in this embodiment. It is located between two adjacent through holes 11, that is, the position where weld lines are likely to be generated. By artificially forming the spacing part 21, the weld lines can be at least partially eliminated. The spacing part 21 can be formed during the process of forming the plastic encapsulation body 2. For example, a plug is set at the corresponding position and taken out after forming, or it can also be formed by machining after the plastic encapsulation body 2 is formed. The number of settings of the spacing part 21 is related to the number of settings of the through holes 11. For example, in Figure 1 and Figure 2 , if eight through holes 11 are evenly distributed, then eight spacing parts 21 are also evenly formed. Of course, the spacing part 21 can also be formed only four or two, or even only one.
[0050] In the technical solution of the present utility model, weld lines are likely to occur at the position of the plastic package body 2 corresponding to the position between two adjacent through holes 11 on the rotor core 1. By forming a space portion 21 at this position, at least part of the weld lines can be eliminated. Under temperature shock loads, the presence of the space portion 21 reduces the degree of cracking of the plastic package body 2 at this position and improves the situation where cracks extend along the weld lines, ensuring the wrapping strength of the plastic package body 2 for the rotor core 1, that is, ensuring the overall strength of the rotor structure 100.
[0051] Please refer to Figure 2 , in some embodiments, a plurality of through holes 11 are arranged circumferentially along the rotor core 1; the space portion 21 is arranged to extend radially along the rotor core 1. "A plurality of through holes 11 are arranged circumferentially along the rotor core 1" means that the central distances of the plurality of through holes 11 from the center of the side end of the rotor core 1 are the same, and the plurality of through holes 11 are usually arranged at equal intervals. At this time, if there are weld lines on the plastic package body 2, then the weld lines will generally extend radially towards the rotor core 1. It can be understood that the radial directions of the plurality of weld lines are inconsistent, and they generally extend towards the center of the side end of the rotor core 1.
[0052] According to the above technical solution, by arranging a plurality of through holes 11 circumferentially along the rotor core 1, the extension path of the weld lines can be generally controlled to extend radially towards the rotor core 1. Then, by arranging the space portion 21 to extend radially along the rotor core 1, the weld lines can be completely eliminated, and the cracking situation of the plastic package body 2 can be basically improved.
[0053] According to the above embodiments, the space portion 21 extends integrally in the radial direction of the rotor core 1. Under temperature shock loads, stress concentration may occur at both ends of the space portion 21 along its own length direction, and cracks are also likely to occur. In view of this, please refer to Figure 1 and Figure 2 , in some embodiments, a plurality of space portions 21 include a first space portion 211. The outer end of the first space portion 211 is spaced from the periphery of the plastic package body 2 to form a spaced area. The plastic package body 2 is correspondingly convex with a rib 25 along the axial direction of the rotor core 1 in the spaced area.
[0054] It should be noted that the periphery of the plastic package body 2 is formed corresponding to the periphery of the rotor core 1, and it usually abuts against the peripheral side wall of the rotor core 1; the number of the first space portions 211 has various situations. For example, one of the plurality of space portions 21 is set as the first space portion 211, two of them are set as the first space portion 211, or even all the space portions 21 are set as the first space portion 211; based on the fact that the space portion 21 extends radially along the rotor core 1, it can be understood that the spaced area is formed between one end of the space portion 21 away from the center of the side end of the rotor core 1 and the periphery of the plastic package body 2.
[0055] According to the above technical solution, since the rib 25 is provided on the extending path of the first spacer 211 towards the periphery of the plastic package 2, the strength of the plastic package 2 at this position is enhanced, which can block the extension of the crack generated in the spacer 211 under the temperature shock load, ensuring that the wrapping strength of the plastic package 2 around the rotor core 1 is at a relatively high level.
[0056] The above embodiments do not limit the shape of the rib 25. In some embodiments, the shape of the rib 25 can be convex dot-shaped, while in other embodiments, the rib 25 is arranged in a long strip shape, and the extending direction of the rib 25 is the same as that of the corresponding first spacer 211. It can be understood that the extending direction of the rib 25 is the same as that of the corresponding first spacer 211, that is, the same as the extending direction where cracks may occur, which has a better strengthening effect on the surface of the plastic package 2.
[0057] Please refer to Figure 1 and Figure 3 In other embodiments, in the axial direction of the rotor core 1, a ring-shaped protrusion 24 is formed at the side end of the periphery of the plastic package 2 facing away from the rotor core 1, where: the inner end of the rib 25 extends to be adjacent to the outer end of the first spacer 211; and / or, the outer end of the rib 25 extends to be connected to the inner wall of the ring-shaped protrusion 24.
[0058] It should be noted that the outer end of the first spacer 211 refers to the end close to the periphery of the plastic package 2. Similarly, the inner end of the first spacer 211 refers to the end close to the center of the side end of the rotor core 1; the outer end of the rib 25 refers to the end close to the periphery of the plastic package 2. Similarly, the inner end of the rib 25 refers to the end close to the center of the side end of the rotor core 1.
[0059] The above two parallel technical features, "the inner end of the rib 25 extends to be adjacent to the outer end of the first spacer 211" and "the outer end of the rib 25 extends to be connected to the inner wall of the ring-shaped protrusion 24", can be set simultaneously or alternatively. Obviously, setting them simultaneously has a better effect. The presence of the ring-shaped protrusion 24 will undoubtedly enhance the strength of the periphery of the plastic package 2, block the cracks that may occur at the outer end of the first spacer 211, and prevent the extension of the cracks. The inner end of the rib 25 extends to be adjacent to the outer end of the first spacer 211, which can resist the stress concentration that may exist at the outer end of the first spacer 211 under the temperature shock load and prevent the generation of cracks. The outer end of the rib 25 extends to be connected to the inner wall of the ring-shaped protrusion 24, which can make full use of the space between the outer end of the first spacer 211 and the inner wall of the ring-shaped protrusion 24 to make the rib 25 large enough to provide a better strengthening effect.
[0060] Please refer to Figure 1 and Figure 2, in some embodiments, the plurality of spaced portions 21 include a second spaced portion 212. Along the axial direction of the rotor core 1, a first through hole 22 is further provided through the potting body 2, and the first through hole 22 is arranged adjacent to the periphery of the potting body 2; the outer end of the second spaced portion 212 extends to communicate with the first through hole 22.
[0061] It should be noted that the "outer end of the second spaced portion 212" refers to the end close to the periphery of the potting body 2. Since the second spaced portion 212 is arranged to extend along the radial direction of the rotor core 1, it usually has a certain length dimension and width dimension; the first through hole 22 is a hole that axially penetrates through the side end of the potting body 2 to the rotor core 1. The outer end of the second spaced portion 212 extends to communicate with the first through hole 22. It should be understood that the first through hole 22 is located between the outer end of the second spaced portion 212 and the periphery of the potting body 2, and the aperture of the first through hole 22 is larger than the width of the second spaced portion 212. The first through hole 22 is usually a hole with a smooth inner wall surface, such as a round hole or an oval hole; the periphery of the potting body 2 usually has a certain thickness in the radial direction of the rotor core 1. Therefore, the first through hole 22 usually has a certain distance from the peripheral side of the potting body 2.
[0062] According to the above technical solution, due to the existence of the first through hole 22, and at the same time the outer end of the second spaced portion 212 penetrates to the first through hole 22, under the temperature shock load, the first through hole 22 can eliminate the stress concentration existing at the outer end of the second spaced portion 212 and prevent the generation of cracks.
[0063] Furthermore, in some embodiments, on the axial direction of the rotor core 1, a ring-shaped protrusion 24 is formed on the side end of the potting body 2 that deviates from the rotor core 1; the first through hole 22 is arranged adjacent to the inner wall of the ring-shaped protrusion 24.
[0064] According to the above technical solution, the existence of the ring-shaped protrusion 24 will undoubtedly strengthen the strength of the periphery of the potting body 2. The first through hole 22 is arranged adjacent to the inner wall of the ring-shaped protrusion 24, making full use of the space between the outer end of the second spaced portion 212 and the inner wall of the ring-shaped protrusion 24, so as to set the aperture of the first through hole 22 large enough to provide a good effect of eliminating the stress concentration at the outer end of the second spaced portion 212.
[0065] Please refer to Figure 1 and Figure 2 , in some other embodiments, a jack 12 is further formed at the side end of the rotor core 1 for inserting a balance pin, and the jack 12 is in alignment and communication with the first through hole 22; wherein, the aperture of the first through hole 22 is larger than the aperture of the jack 12.
[0066] It should be noted that if there is an unbalance in the rotor structure 100, when it rotates, this unbalance will generate a centrifugal force, which gradually increases with the increase of the rotational speed, and is transmitted to the machine through the bearings, causing vibration of the entire machine, generating noise, accelerating the wear of the bearings, reducing the service life of the machine, and even causing the machine control to fail and serious accidents to occur.
[0067] According to the above technical solution, the jack 12 can provide a plugging position for the balance pin during the dynamic balance test of the rotor structure 100, which is beneficial to the progress of the test. Moreover, the position of the jack 12 provided on the rotor core 1 is aligned with the first through hole 22, so that the first through hole 22 not only has the function of eliminating stress concentration, but also has the function of making way for the jack 12.
[0068] Please continue to refer to Figure 1 and Figure 2 , in some other embodiments, the plurality of spaced portions 21 include a first spaced portion 211. The outer end of the first spaced portion 211 is spaced from the periphery of the plastic package 2 to form a spaced area. The plastic package 2 is correspondingly provided with a rib 25 protruding axially along the rotor core 1 in the spaced area; a plurality of first spaced portions 211 and a plurality of second spaced portions 212 are respectively provided, and along the circumferential direction of the rotor core 1, the plurality of first spaced portions 211 and the plurality of second spaced portions 212 are alternately arranged.
[0069] It should be noted that the setting quantity and setting position of the combination of the first spaced portion 211 and the rib 25, and the combination of the second spaced portion 212 and the first through hole 22 will affect the dynamic balance of the rotor structure 100; "the plurality of first spaced portions 211 and the plurality of second spaced portions 212 are alternately arranged" means that a second spaced portion 212 is provided between two adjacent first spaced portions 211, and a first spaced portion 211 is provided between two adjacent second spaced portions 212.
[0070] According to the above technical solution, the combination of the first spaced portion 211 and the rib 25, and the combination of the second spaced portion 212 and the first through hole 22 are provided in plurality along the circumferential direction of the rotor core 1, which can evenly distribute the plurality of ribs 25 and the plurality of first through holes 22 to ensure the dynamic balance of the rotor structure 100.
[0071] Please continue to refer to Figure 2 , in some embodiments, the plastic package 2 is correspondingly formed with a second through hole 23 penetrating through the middle of the side end of the rotor core 1; the inner end of the spaced portion 21 extends to communicate with the second through hole 23.
[0072] It should be noted that a rotating shaft is usually provided in the middle of the side end of the rotor core 1, or a shaft hole for inserting the rotating shaft is provided. The second through hole 23 is arranged corresponding to the middle of the side end of the rotor core 1; the space portion 21 extends along the radial direction of the rotor core 1, and the inner end of the space portion 21 can be understood as the end facing the middle of the side end of the rotor core 1; generally speaking, the aperture of the second through hole 23 is usually larger than the width dimension of the space portion 21.
[0073] According to the above technical solution, the second through hole 23 can provide a clearance for the rotating shaft, so that the plastic sealing body 2 can cover the rotor core 1 as much as possible to ensure sufficient covering strength; and the inner end of the space portion 21 extends to communicate with the second through hole 23, and the stress concentration at the inner end of the space portion 21 can be eliminated through the larger second through hole 23.
[0074] In some embodiments, in the axial direction of the rotor core 1, a ring-shaped protrusion 24 is formed on the side of the peripheral edge of the plastic sealing body 2 away from the side end of the rotor core 1; the rotor structure 100 further includes a magnet portion 3, the magnet portion 3 is arranged on the peripheral side of the rotor core 1, and the end of the magnet portion 3 along the axial direction of the rotor core 1 is embedded in the ring-shaped protrusion 24.
[0075] It should be noted that the magnet portion 3 refers to a component with magnetism. For example, the magnet portion 3 includes magnetic tiles arranged on the peripheral side of the rotor core 1. The number of the magnet portions 3 is not limited in this embodiment; the magnet portion 3 is usually composed of samarium cobalt and medium iron and boron because they have a high magnetic permeability.
[0076] A ring-shaped protrusion 24 is formed on the side of the peripheral edge of the plastic sealing body 2 away from the side end of the rotor core 1, and the end of the magnet portion 3 along the axial direction of the rotor core 1 is embedded in the ring-shaped protrusion 24. It can be understood that the axial dimension of the magnet portion 3 along the rotor core 1 is larger than the circumferential dimension of the rotor core 1 itself. Therefore, the rotor structure 100 can obtain a larger magnetic flux to improve the power of the motor.
[0077] Furthermore, in some embodiments, the side end of the magnet portion 3 away from the rotor core 1 is exposed outside the plastic sealing body 2.
[0078] It can be understood that if the magnet portion 3 is installed inside the rotor structure 100, then the rotor structure 100 belongs to an IPM (Interior Permanent Magnet) rotor, that is, a rotor structure with a permanent magnet installed inside. And in this embodiment, the side end of the magnet portion 3 away from the rotor core 1 is exposed outside the plastic sealing body 2, and the rotor structure 100 belongs to an SPM (Surface-mounted Permanent Magnet) rotor, that is, a rotor structure with a permanent magnet installed outside.
[0079] The present utility model further provides a motor, which includes a rotor structure 100. The specific structure of the rotor structure 100 refers to the above-mentioned embodiments. Since this motor adopts all the technical solutions of 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 elaborated herein one by one. Among them, since the rotor structure 100 is an inner rotor, this motor generally further includes an outer stator adapted to the inner rotor. The specific structure of the outer stator is not limited in this embodiment.
[0080] The present utility model further provides a household appliance, which includes a motor. The specific structure of the motor refers to the above-mentioned embodiments. Since this household appliance adopts all the technical solutions of 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 elaborated herein one by one. Among them, the household appliance includes, but is not limited to, air conditioners, refrigerators, water purifiers, etc.
[0081] The above is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present utility model.
Claims
1. A rotor structure, characterized in that: include: a rotor core having a side end in an axial direction thereof, wherein a plurality of through holes are formed on the side end; and The plastic sealing body is arranged to at least cover the side end of the rotor core. Along the axial direction of the rotor core, a spacer is penetrated through the plastic sealing body. The spacer is arranged corresponding to between two adjacent through holes of the rotor core.
2. The rotor structure according to claim 1, characterized in that: The plurality of through holes are arranged along the circumferential direction of the rotor core; The space portion is extended in a radial direction of the rotor core.
3. The rotor structure according to claim 2, characterized in that: The plurality of spacers include a first spacer, the outer end of which is spaced apart from the periphery of the plastic-encapsulated body to form a spacer area, and the plastic-encapsulated body is provided with ribs protruding in the axial direction of the rotor core corresponding to the spacer area.
4. The rotor structure according to claim 3, characterized in that: The ribs are arranged in a long strip shape, and the extending direction of the ribs is consistent with the extending direction of the corresponding first spacer.
5. The rotor structure according to claim 3, characterized in that: In the axial direction of the rotor core, an annular protrusion is formed on the side end of the periphery of the plastic package body away from the rotor core, wherein: The inner end of the rib body extends to the outer end adjacent to the first spacer; and / or, The outer end of the rib body extends to be connected to the inner wall of the annular protrusion.
6. The rotor structure according to claim 2, characterized in that: The plurality of spacers include a second spacer, and along the axial direction of the rotor core, the plastic sealing body is further provided with a first through hole, and the first through hole is arranged adjacent to the periphery of the plastic sealing body; The outer end of the second spacer extends to communicate with the first through hole.
7. The rotor structure according to claim 6, characterized in that: In the axial direction of the rotor core, an annular protrusion is formed on the side end of the periphery of the plastic sealing body away from the rotor core; The first through hole is disposed adjacent to the inner wall of the annular protrusion.
8. The rotor structure according to claim 6, characterized in that: The side end of the rotor core is also formed with an insertion hole, the insertion hole is used for the balancing pin to be inserted, and the insertion hole is aligned and connected to the first through hole; Wherein, the aperture of the first through hole is larger than the aperture of the insertion hole.
9. The rotor structure according to claim 6, characterized in that: The plurality of spacers include a first spacer, the outer end of which is spaced from the periphery of the plastic-sealed body to form a spacer area, and the plastic-sealed body is provided with a rib protruding in the axial direction of the rotor core corresponding to the spacer area; A plurality of the first space portions and a plurality of the second space portions are provided respectively, and the plurality of the first space portions and the plurality of the second space portions are alternately provided along the circumferential direction of the rotor core.
10. The rotor structure according to claim 2, characterized in that: The plastic sealing body is formed with a second through hole at the middle of the side end of the rotor core; The inner end of the spacer extends to communicate with the second through hole.
11. The rotor structure according to claim 1, characterized in that: In the axial direction of the rotor core, an annular protrusion is formed on the side end of the periphery of the plastic sealing body away from the rotor core; The rotor structure further includes a magnet portion that is disposed on a circumferential side of the rotor core, and an end portion of the magnet portion in an axial direction of the rotor core is embedded in the annular protrusion.
12. The rotor structure according to claim 11, characterized in that: The side end of the magnet part away from the rotor core part is exposed from the plastic packaging body.
13. A motor, characterized in that: Comprising a rotor structure as claimed in any one of claims 1 to 12.
14. A household appliance, characterized in that: Comprising the motor as claimed in claim 13.