Surface-mounted structure rotor and motor

Abstract

The utility model provides a kind of surface mount structure rotor and motor, it is related to motor field, in view of the problem that surface mount rotor is not improper in the process of magnetic steel sticking and leads to poor gluing effect of limiting tooth structure, by the length of limiting tooth along the axial direction of rotor iron core is designed to be less than the axial length of the magnetic steel contained by corresponding positioning groove, provide avoidance space for gluing path, realize the effective positioning of magnetic steel, avoid the process complex problem caused by using additional tooling, when gluing, glue head can be operated in the area outside the axial length of limiting tooth, avoid the collision of glue head and limiting tooth, so that glue head and rotor iron core can be kept appropriate distance from each other, ensure that glue can be smoothly attached on rotor iron core;The recess relative to the outer circumferential profile of rotor iron core is set as glue storage groove at the groove bottom of positioning groove, to provide storage space for glue.

Description

Technical Field

[0001] This utility model relates to the field of motors, specifically to a surface-mount rotor and motor. Background Technology

[0002] Permanent magnet motors are commonly used as power sources in household appliances due to their high power density. The rotor structure of permanent magnet motors is divided into embedded rotors and surface-mounted rotors. Compared to embedded rotors, surface-mounted rotors have less magnetic leakage, higher magnetic energy utilization, and more flexible structural design, making them suitable for miniaturized equipment. Surface-mounted rotors require an adhesive application process to bond the magnets to the outer circumference of the rotor core. The adhesive application method affects the rotor's structural design. To better ensure uniform magnet distribution, limiting teeth matching the installation position and number of magnets are pre-machined on the rotor core.

[0003] When installing magnets on the rotor core, if the height of the limiting teeth is too low, their positioning function will be poor. If the limiting teeth are too high, during the rotary layering adhesive application process, to avoid collision between the adhesive applicator and the limiting teeth, the distance between the adhesive applicator and the rotor core application position will be too large, making it difficult for the adhesive to adhere to the rotor core. Furthermore, since the outer circumference of the magnet installation position on the rotor core has the same diameter as the inner circumference of the magnet, during the shaping process after magnet installation, a large amount of adhesive will be squeezed out from the contact area between the rotor core and the magnet, resulting in a smaller effective adhesive thickness and limited bonding strength. Although existing technologies can use additional indexing fixtures to assist in the positioning during magnet bonding, this adds extra steps and requires additional tooling, making the operation more complex. Alternatively, the gluing method can be changed to dotting or vertical 1-shaped gluing, but the gluing method is not flexible and the gluing efficiency is not high. Using an eccentric inner circle of the magnet or a diameter slightly smaller than the outer diameter of the rotor core leaves a gap for glue storage at the bonding position. However, during the rotor shaping process, the radial force on the magnet cannot be effectively transmitted to the rotor core. Excessive radial force can easily cause cracks in the magnet, leading to rotor scrap. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a surface-mount rotor and motor. By designing the length of the limiting teeth along the axial direction of the rotor core to be less than the axial length of the magnet accommodated in the corresponding positioning slot, a clearance space is provided for the adhesive application path, achieving effective positioning of the magnet and avoiding the complexity of the process caused by using additional tooling. During adhesive application, the adhesive application head can operate in an area outside the axial length of the limiting teeth, avoiding collision between the adhesive application head and the limiting teeth. This ensures that the adhesive application head and the rotor core bonding position maintain a suitable distance, guaranteeing that the adhesive can adhere smoothly to the rotor core.

[0005] The primary objective of this invention is to provide a surface-mount rotor, which employs the following solution:

[0006] It includes a rotor core and magnets. Multiple limiting teeth are distributed at intervals along the outer circumference of the rotor core. The limiting teeth protrude from the outer circumference of the rotor core. A positioning groove for constraining the magnet is formed between adjacent limiting teeth along the circumference of the rotor core. The length of the limiting teeth along the axial direction of the rotor core is less than the axial length of the magnet accommodated by the corresponding positioning groove, so as to avoid the glue application path. The magnet is an arc-shaped plate. The diameter of the inner arc surface of the magnet is equal to the diameter of the outer circumference of the rotor core. The bottom of the positioning groove has a recess relative to the outer circumference of the rotor core as a glue storage groove.

[0007] Furthermore, the magnets are divided into multiple groups along the rotor core axis, each group including multiple magnets spaced upwards around the rotor core ring, and the limiting teeth are located between adjacent magnets on the rotor core ring.

[0008] Furthermore, the limiting teeth are also divided into multiple groups along the rotor core axis. Each group includes multiple teeth that are spaced upward around the rotor core ring. Each group of limiting teeth corresponds to each group of magnets, and the limiting teeth of adjacent groups are spaced upward along the axis.

[0009] Furthermore, the number of limiting teeth in each group is equal to the number of positioning grooves they form, and equal to the number of magnets in each group.

[0010] Furthermore, the spacing between adjacent sets of limiting teeth along the rotor core axis is greater than the maximum diameter of the glue-applying needle.

[0011] Furthermore, after the magnets are installed in the positioning slots, the corresponding outer arc surfaces of all the magnets are located on the same cylindrical surface.

[0012] Furthermore, the thickness of the magnet in the radial direction is greater than the depth of the positioning groove in the radial direction, so that the outer arc surface of the magnet is located outside the positioning groove.

[0013] Furthermore, the bottom of the glue storage tank is a first arc surface, and the diameter corresponding to the first arc surface is larger than the diameter of the outer circumference of the rotor core.

[0014] Furthermore, the positioning groove has two segments of first arc surface distributed within it, each segment of the first arc surface forming a glue storage groove. The junction of the two segments of the first arc surface within the same positioning groove forms a protrusion relative to the glue storage groove, and the protrusion is coplanar with the outer circumferential surface of the rotor core.

[0015] The second objective of this invention is to provide an electric motor that utilizes a surface-mount rotor as described in the first objective.

[0016] Compared with the prior art, the advantages and positive effects of this utility model are:

[0017] To address the issue of poor adhesive application caused by improper limiting tooth structure during magnet bonding in surface-mount rotors, this paper proposes a new method. By designing the length of the limiting teeth along the rotor core axis to be less than the axial length of the magnet accommodated in the corresponding positioning slot, a clearance space is provided for the adhesive application path, achieving effective magnet positioning and avoiding the complexity of the process caused by using additional tooling. During adhesive application, the applicator head can operate in an area outside the axial length of the limiting teeth, avoiding collisions between the applicator head and the limiting teeth. This ensures that the applicator head and the rotor core bonding position maintain a suitable distance, guaranteeing that the adhesive can adhere smoothly to the rotor core. A recessed groove, corresponding to the outer circumference of the rotor core, is provided at the bottom of the positioning groove to store the adhesive. When the magnet is installed in the positioning groove, some of the adhesive that would otherwise be squeezed out during the shaping process can flow into the adhesive storage groove, reducing the amount of adhesive squeezed out at the contact point between the rotor core and the magnet. This increases the effective adhesive thickness and improves the bonding strength. At the same time, the diameter of the inner arc surface of the magnet is equal to the diameter of the outer circumference of the rotor core. During the shaping process, the radial force on the magnet can be effectively transmitted to the rotor core, avoiding cracks in the magnet due to excessive radial force. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0019] Figure 1 This is a schematic diagram showing the distribution of limiting teeth on the rotor core in one or more embodiments of the present invention.

[0020] Figure 2 This is a schematic diagram showing the positioning slots distributed on the rotor core in one or more embodiments of the present invention.

[0021] Figure 3 This is a schematic diagram of a storage slot provided on a positioning slot in one or more embodiments of the present invention.

[0022] Figure 4 This is a schematic diagram of magnets mounted on the rotor core in one or more embodiments of the present invention.

[0023] Among them, 1. limiting teeth; 2. rotor core; 3. positioning groove; 4. bottom of positioning groove; 5. groove wall; 6. glue storage groove; 7. outer circumferential surface of rotor core; 8. magnet. Detailed Implementation

[0024] Example 1

[0025] In a typical embodiment of this utility model, such as Figures 1-4 As shown, a surface-mounted rotor structure is presented.

[0026] In the existing surface-mount rotor process, the bonding of magnets 8 presents several problems: improper design of the height of the limiting teeth 1 leads to difficulties in applying adhesive; excessive extrusion of adhesive on the bonding surface between magnets 8 and rotor core 2 results in insufficient bonding strength; and existing improvement solutions suffer from complex processes, low adhesive application efficiency, and susceptibility to cracking of magnets 8. Excessive height of the limiting teeth 1 results in an excessively large gap between the adhesive applicator and rotor core 2, making adhesive adhesion difficult; excessive height results in poor positioning. The inner diameter of magnets 8 is equal to the outer diameter of rotor core 7, causing excessive adhesive extrusion during shaping, resulting in a small effective bonding thickness and limited strength. Adding additional indexing fixtures complicates operations; changing the adhesive application method is inflexible and inefficient; and eccentricity or a slightly smaller diameter of the inner diameter of magnets 8 makes them prone to cracking under radial forces.

[0027] Based on this, this embodiment provides a surface-mount structure rotor. By designing the length of the limiting tooth 1 along the axial direction of the rotor core 2 to be less than the axial length of the magnet 8 accommodated by the corresponding positioning groove 3, a clearance space is provided for the adhesive application path, thus achieving effective positioning of the magnet 8 and avoiding the process complexity caused by using additional tooling.

[0028] The surface-mount rotor consists of a rotor core 2 and magnets 8. Multiple locating teeth 1 are spaced circumferentially along the outer circumferential surface 7 of the rotor core. The locating teeth 1 protrude from the outer circumferential surface 7, and adjacent locating teeth 1 form positioning grooves 3 that constrain the magnets 8. The length of the locating teeth 1 along the axial direction of the rotor core 2 is less than the axial length of the magnet 8 accommodated in the corresponding positioning groove 3. The bottom 4 of the positioning groove has a recess relative to the outer circumferential contour of the rotor core 2, serving as a glue storage groove 6. The magnet 8 is an arc-shaped plate, and the diameter of its inner arc surface is equal to the diameter of the outer circumferential surface 7 of the rotor core.

[0029] In this embodiment, the problem of adhesive application caused by the height of the limiting tooth 1 is solved by designing the length of the limiting tooth 1 along the axial direction of the rotor core 2 to be less than the axial length of the magnet 8 accommodated by the corresponding positioning groove 3, thus providing clearance space for the adhesive application path.

[0030] When applying adhesive, the adhesive applicator can operate in an area outside the axial length of the limiting tooth 1, avoiding collision between the adhesive applicator and the limiting tooth 1. This ensures that the adhesive applicator and the rotor core 2 are properly positioned, guaranteeing that the adhesive can adhere smoothly to the rotor core 2.

[0031] It also solves the problem of adhesive extrusion at the bonding surface. A recessed area 6, corresponding to the outer circumference of the rotor core 2, is set at the bottom 4 of the positioning groove to provide storage space for the adhesive. When the magnet 8 is installed into the positioning groove 3, during the shaping process, some of the adhesive that would otherwise be squeezed out can flow into the adhesive storage 6, reducing the amount of adhesive squeezed out at the bonding position between the rotor core 2 and the magnet 8, thereby increasing the effective adhesive thickness and improving the bonding strength.

[0032] Through the rational design of the limiting teeth 1 and the positioning groove 3, the magnet 8 is effectively positioned, avoiding the process complexity caused by using additional tooling. By resolving the collision issue between the glue applicator and the limiting teeth 1, the glue application method can be selected more flexibly, improving glue application efficiency. The diameter of the inner arc surface of the magnet 8 is equal to the diameter of the outer circumference surface 7 of the rotor core. During the forming process, the radial force on the magnet 8 can be effectively transmitted to the rotor core 2, preventing cracks in the magnet 8 due to excessive radial force.

[0033] A suitable distance is maintained between the glue applicator and the rotor core 2, allowing the glue to adhere smoothly to the rotor core 2, thus improving the reliability and stability of the glue application. The glue storage tank 6 reduces the amount of glue extruded, increases the effective bonding thickness, and thereby improves the bonding strength between the magnet 8 and the rotor core 2, making the rotor structure more robust. No additional indexing fixtures are needed, simplifying the production process. The glue application method is also more flexible and efficient, shortening production time and improving production efficiency. It avoids cracking of the magnet 8 due to excessive radial force, reducing the rotor scrap rate and improving product quality and reliability.

[0034] The design of the limiting tooth 1 and the positioning groove 3 enables the precise positioning of the magnet 8. At the same time, the combination of the glue storage groove 6 optimizes the overall structural design of the rotor, making it more suitable for the application requirements of miniaturized equipment.

[0035] like Figure 1 , Figure 2 As shown, the magnets 8 are divided into multiple groups along the axial direction of the rotor core 2. Each group contains multiple magnets 8 spaced apart in a ring-like arrangement upwards, with limiting teeth 1 located between adjacent magnets 8. The limiting teeth 1 are also divided into multiple groups along the axial direction of the rotor core 2. Each group includes multiple limiting teeth 1 spaced apart in a ring-like arrangement around the rotor core 2. Each group of limiting teeth 1 corresponds to each group of magnets 8, and the limiting teeth 1 of adjacent groups are spaced apart in the axial direction. The number of limiting teeth 1 in each group is equal to the number of positioning grooves 3 formed by it, and equal to the number of magnets 8 in each group. The limiting teeth 1 and magnets 8 are grouped synchronously, with the number in each group matching the number of corresponding groups of magnets 8, and the limiting teeth 1 of adjacent groups are spaced apart in the axial direction.

[0036] Traditional integral positioning teeth 1 are prone to collision with the applicator head during axial movement. The grouped layout, with its axially spaced positioning teeth 1, provides axial movement space for the applicator head. Each group of positioning teeth 1 corresponds one-to-one with a magnet 8, avoiding circumferential misalignment when installing multiple groups of magnets 8 and improving positioning accuracy.

[0037] When applying adhesive, the adhesive head can move along the axial direction in the interval area between adjacent groups of limiting teeth 1 to avoid being blocked by the limiting teeth 1; each group of limiting teeth 1 only constrains the corresponding group of magnets 8, and the precise installation of multiple groups of magnets 8 can be achieved through group positioning and axial misalignment.

[0038] like Figure 1 As shown, in this embodiment, two sets of limiting teeth 1 are set as an example. The number of limiting teeth 1 is n, where n is the number of rotor poles. The height of the limiting teeth 1 is greater than 0.5mm. Each limiting tooth 1 is divided into 4 segments. The length of the upper segment is L1, the length of the lower segment is L1, L0 is the length of the non-coupling segment between the magnet 8 and the iron core, and the space in the middle segment is the glue application channel. Assuming that two glue application needles are used for glue application, the width of the glue application channel L2 is the maximum diameter of the glue application needle D*2+L3+5mm, L3 is the distance between the glue application needles, and the height of the magnet 8 is L. Overall, L=2*L1+D*2+L3+5mm.

[0039] The number of limiting teeth 1 in each group equals the number of positioning grooves 3 in each group, which in turn equals the number of magnets 8 in each group. The one-to-one correspondence between positioning grooves 3 and magnets 8 ensures that each magnet 8 is constrained by an independent positioning groove 3, preventing relative displacement of the magnets 8 in the circumferential direction. This matching quantity ensures that the positioning grooves 3 are evenly distributed in the circumferential direction, allowing the adhesive to evenly fill each positioning groove 3 during application, avoiding localized adhesive shortages.

[0040] The axial spacing between adjacent sets of limiting teeth 1 is greater than the maximum diameter of the dispensing needle. This prevents mechanical interference between the dispensing needle and the limiting teeth 1 during axial movement, ensuring that the dispensing head can move smoothly between the positioning slots 3 of different sets of magnets 8. It supports high-speed reciprocating motion of automated dispensing equipment, improving dispensing efficiency. For example, multiple sets of magnets 8 can be dispensed in one go without frequent adjustment of the dispensing needle position.

[0041] In this embodiment, as Figure 2 As shown, the outer circumferential surface 7 of the rotor core forms n circular arcs as positioning grooves 3, where n is the number of poles of the rotor.

[0042] like Figure 4 As shown, the outer arc surfaces of all magnets 8 are located on the same cylindrical surface, and the radial thickness of magnets 8 is greater than the depth of the positioning groove 3, causing the outer arc surfaces to protrude from the positioning groove 3. The coplanar design ensures that the centrifugal force is evenly distributed when the rotor rotates, avoiding vibration and noise caused by inconsistent protrusion heights of magnets 8.

[0043] The bottom of the glue storage tank 6 is a first arc surface. The diameter of the first arc surface is larger than the diameter of the outer circumferential surface 7 of the rotor core. Two sections of the first arc surface are distributed in the positioning groove 3, and a protrusion coplanar with the outer circumferential surface of the core is formed at the junction.

[0044] Specifically, such as Figure 3 As shown, the bottom of the positioning groove 3, along the outer circumference of the rotor core 7, is successively marked with the starting point, the vertex, and the ending point. All three points are on the outer circumference of the rotor core 7. The arc between the starting point and the vertex, and the arc between the vertex and the ending point, respectively form the first arc surface. The first arc surface is not concentric with the outer circumference of the rotor core 7, and the diameter corresponding to the first arc surface is larger than the diameter of the outer circumference of the rotor core 7, thus forming the required glue storage groove 6.Figure 3 As shown, the maximum distance between the first arc surface and the outer circumferential surface 7 of the rotor core is 0.1mm≤h1≤0.15mm, which ensures that the glue can be retained.

[0045] The increased diameter of the arc surface increases the volume of the glue storage tank 6, allowing it to hold more glue and preventing excessive glue extrusion during shaping. The two arc surfaces form symmetrical glue storage cavities, ensuring that the glue flows evenly into the glue storage tanks 6 on both sides during extrusion. The junction protrusion is coplanar with the outer circumference of the iron core, supporting the inner surface of the magnet 8 after its installation. This concentrates the pressure on the bonding surface at the protrusion, preventing the magnet 8 from deforming due to excessive local pressure.

[0046] Example 2

[0047] In another typical embodiment of this utility model, such as Figures 1-4 As shown, a type of motor is presented.

[0048] In this embodiment, the motor is mainly composed of a stator, a surface-mount rotor, an end cover, a shaft, and other components. The surface-mount rotor is the same as that in Embodiment 1. The surface-mount rotor adopts the same layout of limiting teeth 1, adhesive storage groove 6, and protruding magnet 8 as in Embodiment 1.

[0049] The motor in this embodiment can be applied to small household appliances, such as vacuum cleaners and blenders, whose high power density and low noise characteristics are suitable for home use; it can also be applied to medical devices, such as surgical instruments driven by servo motors.

[0050] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A surface-mount rotor, characterized in that, It includes a rotor core and magnets. Multiple limiting teeth are distributed at intervals along the outer circumference of the rotor core. The limiting teeth protrude from the outer circumference of the rotor core. A positioning groove for constraining the magnet is formed between adjacent limiting teeth along the circumference of the rotor core. The length of the limiting teeth along the axial direction of the rotor core is less than the axial length of the magnet accommodated by the corresponding positioning groove, so as to avoid the glue application path. The magnet is an arc-shaped plate. The diameter of the inner arc surface of the magnet is equal to the diameter of the outer circumference of the rotor core. The bottom of the positioning groove has a recess relative to the outer circumference of the rotor core as a glue storage groove.

2. The surface-mount rotor as described in claim 1, characterized in that, The magnets are divided into multiple groups along the rotor core axis, and each group includes multiple magnets that are spaced apart and distributed upward around the rotor core ring. The limiting teeth are located between adjacent magnets on the rotor core ring.

3. The surface-mount rotor as described in claim 2, characterized in that, The limiting teeth are also divided into multiple groups along the rotor core axis. Each group includes multiple teeth that are spaced upwards around the rotor core ring. Each group of limiting teeth corresponds to each group of magnets, and the limiting teeth of adjacent groups are spaced upwards along the axis.

4. The surface-mount rotor as described in claim 3, characterized in that, The number of limiting teeth in each group is equal to the number of positioning grooves they form, and equal to the number of magnets in each group.

5. The surface-mount rotor as described in claim 3 or 4, characterized in that, The spacing between adjacent sets of limiting teeth along the rotor core axis is greater than the maximum diameter of the glue-applying needle.

6. The surface-mount rotor as described in claim 3 or 4, characterized in that, After the magnets are installed in the positioning slots, the corresponding outer arc surfaces of all the magnets are located on the same cylindrical surface.

7. The surface-mount rotor as described in claim 1, 2, 3, or 4, characterized in that, The thickness of the magnet in the radial direction is greater than the depth of the positioning groove in the radial direction, so that the outer arc surface of the magnet is located outside the positioning groove.

8. The surface-mount rotor as described in claim 1, characterized in that, The bottom of the glue storage tank is a first arc surface, and the diameter of the first arc surface is larger than the diameter of the outer circumference of the rotor core.

9. The surface-mount rotor as described in claim 8, characterized in that, The positioning groove has two segments of first arc surface, each segment of which forms a glue storage groove. The junction of the two segments of first arc surface in the same positioning groove forms a protrusion relative to the glue storage groove, and the protrusion is coplanar with the outer circumferential surface of the rotor core.

10. An electric motor, characterized in that, The rotor with a surface-mount structure as described in any one of claims 1-9 is used.

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