Rotor structure and motor

Abstract

The utility model relates to a rotor structure and a motor, and the technical scheme comprises an iron core which is provided with an embedding hole; the magnet is arranged in the embedding hole; the output shaft is mounted in the iron core; the end cover is mounted on the output shaft and is positioned at one end of the iron core; the fan blade is mounted on the output shaft and is positioned at the other end of the iron core; the pressing piece is integrally formed on the fan blade; and the pressing piece abuts against the magnet, so that the effect of improving the yield is achieved.

Description

Technical Field

[0001] The present application relates to the field of tool technology, and in particular to a rotor structure and a motor. Background Art

[0002] With the development of the power tool industry, DC power tools, due to their greater portability, have gradually replaced AC power tools as the preferred choice for many operators. This has also promoted the development of permanent magnet DC motors. Permanent magnet DC motors, as the name suggests, are motors with magnetic elements fixed within them. Therefore, securing the magnets within the motor is a key issue for permanent magnet DC motors.

[0003] Traditionally, magnets are typically mounted and fixed using two methods. One method is gluing, which involves pouring glue into the rotor's magnet mounting slots. Once the glue solidifies, it secures the magnets. However, this process is time-consuming and has stringent requirements for materials and the operating environment. Each step has a strict operating window and requires a high level of operator experience. This makes the process complex and costly. Furthermore, the glue can easily fail at high temperatures, causing defects. Therefore, another method is often used: end fixtures. This typically involves using plastic or metal parts to press the magnets against the rotor ends to secure them.

[0004] However, in order to make the magnets have better magnetic properties, the magnets are slightly protruded from the surface of the rotor and then pressed with fan blades. At this time, using fan blades to fix the magnets can easily cause damage to the magnets, resulting in a lower yield rate, so this needs to be improved. Utility Model Content

[0005] Based on this, it is necessary to provide a rotor structure and a motor to address the problem of low yield of motor magnets.

[0006] In order to solve the above technical problems, this application is implemented as follows:

[0007] In one embodiment, a rotor structure is provided, comprising:

[0008] An iron core is provided with an embedding hole;

[0009] a magnet, disposed in the embedding hole;

[0010] an output shaft, mounted in the iron core;

[0011] an end cover, mounted on the output shaft and located at one end of the iron core;

[0012] a fan blade, mounted on the output shaft and located at the other end of the iron core;

[0013] A pressing piece is integrally formed on the fan blade; the pressing piece abuts against the magnet.

[0014] Optionally, at least one end of the magnet protrudes from the end surface of the iron core.

[0015] Optionally, the pressing member is an elastic member. When the pressing member is subjected to force, the pressing member can be deformed and has a tendency to reset, so that the force of the deformation of the pressing member is smaller than the force that breaks the magnet.

[0016] Optionally, the fan blade includes a main body, a central part, and a supporting ridge connecting the main body and the central part, and the elastic member is located on the supporting ridge, and the elastic member is radial.

[0017] Optionally, the elastic member is inclined from the central portion toward the main body portion, and the height of the elastic member increases gradually from the central portion toward the main body portion.

[0018] Optionally, the inclination angle of the elastic member is (0,5°].

[0019] Optionally, the width of the elastic member is [0.2 mm, 0.8 mm], and the height of the elastic member is [0.2 mm, 2 mm].

[0020] Optionally, the fan blade is made of one of PA6, PA66, PP, ABS or AS.

[0021] Optionally, the main body protrudes from the end surface of the central portion, and the elastic member protrudes from the central portion.

[0022] Based on the same inventive concept, in another embodiment, a motor is provided, comprising:

[0023] stator;

[0024] a coil, disposed on the stator;

[0025] And, the rotor structure as described in any of the above embodiments, the rotor structure is arranged in the stator.

[0026] In the embodiment of the present application, the magnet in the iron core is compressed by a compression member provided on the fan blade, thereby compressing and fixing the magnet. While fixing the magnet, the probability of magnetic pole damage is reduced, thereby improving the yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic cross-sectional view of a rotor structure in one embodiment of the present application;

[0028] Figure 2Schematic diagram of the overall structure of a fan blade in one embodiment of the present application;

[0029] Figure 3 is a schematic cross-sectional view of a fan blade structure in one embodiment of the present application;

[0030] Figure 4 FIG. 1 is a schematic diagram of a motor structure in an embodiment of the present application.

[0031] Description of the drawings: 1. Iron core; 2. Magnet; 3. Output shaft; 4. End cover; 5. Fan blade; 51. Main body; 52. Center; 53. Support rib; 6. Pressing member; 7. Stator; 8. Coil; DETAILED DESCRIPTION

[0032] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0035] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0036] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0038] See Figure 1 FIG1 shows a cross-sectional schematic diagram of a rotor structure in an embodiment of the present application. An embodiment of the present application provides a rotor structure comprising an iron core 1, a magnet 2, an output shaft 3, an end cover 4, a fan blade 5, and a pressing member 6, wherein the iron core 1 can be formed by stacking multiple silicon steel sheets, and the output shaft 3 can be installed at the center of the iron core 1. The iron core 1 can be provided with an embedding hole 11, and a plurality of embedding holes 11 can be provided, which are evenly distributed along the circumference of the output shaft 3. The shape of the embedding hole 11 is adapted to the magnet 2, and the magnet 2 can be installed in the embedding hole 11.

[0039] See Figure 1 and Figure 2FIG2 shows a schematic diagram of the fan blade structure in an embodiment of the present application. The end cover 4 can be press-fitted onto the output shaft 3 by means of an interference fit and located at one end of the iron core 1. The end face of the magnet 2 is in contact with the surface of the end cover 4. The fan blade 5 can be press-fitted onto the end of the output shaft 3 away from the end cover 4 by means of an interference fit. The fan blade 5, the iron core 1, and the end cover 4 rotate synchronously relative to the output shaft 3. The pressing member 6 can be integrally formed on the fan blade 5 and located on the surface of the fan blade 5 facing the iron core 1. When the fan blade 5 is installed, the pressing member 6 can abut against the magnet 2, thereby fixing the position of the magnet 2.

[0040] In other preferred embodiments, the length of the magnet 2 can be longer than the length of the iron core 1, so that after the magnet 2 is installed in the embedding hole 11, at least one end of the magnet 2 will protrude from the surface of the iron core 1. In this case, the pressing member 6 can protrude from the surface of the fan blade 5, or it can be flush with the surface of the fan blade 5, or even slightly lower than the surface of the fan blade 5, as long as it can abut against the magnet 2.

[0041] In other preferred embodiments, the pressing member 6 is an elastic member, that is, the pressing member 6 is elastic. When a force is applied to the pressing member 6, the pressing member 6 can deform and has a tendency to return to its original position. In addition, the force applied to the pressing member 6 to cause the pressing member 6 to deform is smaller than the force applied to the magnet 2 to break it, thereby protecting the integrity of the magnet 2.

[0042] In another preferred embodiment, the blade 5 includes a main body 51, a central portion 52, and supporting ribs 53. The central portion 52 may be cylindrical, the main body 51 may be cylindrical and concentric with the central portion 52, and the supporting ribs 53 connect the main body 51 and the central portion 52. The main body 51, the central portion 52, and the supporting ribs 53 may be integrally formed. The elastic member is located on the supporting ribs 53. Specifically, the elastic member may extend radially from the central portion 52 toward the main body 51, thereby increasing the probability of pressing against the magnet 2.

[0043] See Figure 2 and Figure 3 FIG3 shows a cross-sectional view of a fan blade structure in one embodiment of the present application. In other preferred embodiments, the elastic member is inclined from the center portion 52 toward the main portion 51. This inclination reduces the contact area between the elastic member and the magnet 2 when the fan blade 5 is press-fitted, thereby facilitating the extrusion and deformation of the elastic member. In particular, the elastic member increases in height from the center portion 52 toward the main portion 51, thereby ensuring that the edges of the fan blade 5 are flush after installation. Preferably, the inclination angle of the elastic member is (0.5°). In the embodiment of the present application, the inclination angle of the elastic member is 2°, and may also be 3° or 2.5°.

[0044] In other preferred embodiments, the width of the elastic member is [0.2mm, 0.8mm], and the height of the elastic member is [0.2mm, 1mm]. In the embodiment of the present application, the width of the elastic member is 0.3mm, and can also be 0.4mm, 0.5mm, or 0.6mm; the height of the elastic member is 0.3mm, 0.4mm, 0.5mm, or even 0.6mm, 0.8mm, 1.0mm, or 1.2mm, as long as it is convenient for the deformation of the elastic member and has elasticity.

[0045] In other preferred embodiments, the material of the fan blade 5 is one of PA6, PA66, PP, ABS or AS, wherein PA6 is polyamide 6, PA66 is polyamide 66, PP is polypropylene, ABS is a terpolymer of three monomers: acrylonitrile (A), butadiene (B), and styrene (S), and AS is a styrene-acrylonitrile copolymer; thereby, the elastic member has both strength and elasticity.

[0046] In other preferred embodiments, the main body 51 protrudes from the end surface of the central portion 52, that is, the dimension of the main body 51 in the length direction of the output shaft 3 is greater than the dimension of the central portion 52 in the length direction of the output shaft 3. The elastic member protrudes from the central portion 52, thereby facilitating contact with the magnet 2.

[0047] Combine Figure 4 As shown, Figure 4 shows a schematic diagram of the motor structure in an embodiment of the present application. In some embodiments, based on the same inventive concept, the present application also discloses a motor, including a stator 7, a coil 8 and a rotor structure as disclosed in any of the above embodiments, wherein the wire is wound around the stator 7 to form the coil 8, and the rotor structure is arranged at the center of the stator 7 and can rotate freely.

[0048] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A rotor structure, characterized in that: include: An iron core is provided with an embedding hole; a magnet, disposed in the embedding hole; an output shaft, mounted in the iron core; an end cover, mounted on the output shaft and located at one end of the iron core; a fan blade, mounted on the output shaft and located at the other end of the iron core; A pressing piece is integrally formed on the fan blade; the pressing piece abuts against the magnet.

2. The rotor structure according to claim 1, characterized in that: At least one end of the magnet protrudes from the end surface of the iron core.

3. The rotor structure according to claim 1, characterized in that: The pressing member is an elastic member. When the pressing member is subjected to force, the pressing member can be deformed and has a tendency to reset, so that the force of the deformation of the pressing member is smaller than the force that breaks the magnet.

4. The rotor structure according to claim 3, characterized in that: The fan blade includes a main body, a central part, and a supporting edge connecting the main body and the central part. The elastic member is located on the supporting edge and is radially shaped.

5. The rotor structure according to claim 4, characterized in that: The elastic member is inclined from the central portion toward the main body portion, and the height of the elastic member increases gradually from the central portion toward the main body portion.

6. The rotor structure according to claim 5, characterized in that: The inclination angle of the elastic member is (0,5°].

7. The rotor structure according to claim 3, characterized in that: The width of the elastic member is [0.2 mm, 0.8 mm], and the height of the elastic member is [0.2 mm, 2 mm].

8. The rotor structure according to claim 1, characterized in that: The material of the fan blade is one of PA6, PA66, PP, ABS or AS.

9. The rotor structure according to claim 4, characterized in that: The main body protrudes from the end surface of the central portion, and the elastic member protrudes from the central portion.

10. A motor, characterized in that: include: stator; a coil, disposed on the stator; And, the rotor structure according to any one of claims 1 to 9, wherein the rotor structure is arranged in the stator.

Images