Inner rotor brushless motor easy to assemble

Abstract

The utility model discloses an inner rotor brushless motor easy to assemble. The inner rotor brushless motor comprises a housing assembly, a stator assembly, a rotor assembly, a circuit board and a positioning assembly. The stator assembly is installed in the shell assembly and is in clearance fit with the shell assembly. The rotor assembly is located in the stator assembly and rotationally connected with the shell assembly, and the two ends of the rotor assembly penetrate through the shell assembly. The circuit board is mounted at one end of the stator assembly and sleeves the rotor assembly; the positioning assembly comprises a first asymmetric positioning mechanism arranged between the stator assembly and the shell assembly and a second asymmetric positioning mechanism arranged between the stator assembly and the circuit board, so that the circuit board, the stator assembly and the shell assembly form a unique connection relation. According to the utility model, errors in the assembly process can be prevented, accurate installation is realized, the assembly efficiency is improved, the shell assembly and the stator assembly are in clearance fit, the first positioning mechanism is utilized to ensure firm connection, and compared with hot jacket connection, the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to an inner rotor brushless motor which is easy to assemble. Background Art

[0002] The inner rotor brushless motor is a DC motor with a simple structure that requires a driver. Compared with traditional brushed motors, this motor has the advantages of high efficiency, low noise, long life and more precise control. It is usually used in aerospace, robotics, automobiles, medical equipment and other fields. In the future, as brushless motors continue to improve and perfect, they will be used in more fields.

[0003] At present, the assembly process of the stator and the housing in the inner rotor motor is complicated and the production cost is high. For example, the existing regular circuit board 4 and the stator assembly 2 are fixed with the first screw 14 (see below). Figure 1-Figure 3 ), it is too cumbersome to fix, and the circuit board needs to be adjusted to a specific position. Because a regular circuit board has a centrally symmetrical and / or axially symmetrical ring-like structure, it can still be installed after rotating a certain angle, but the different installation positions are not only inconvenient for welding the connecting wires, but also affect the installation of the end cover. At the same time, the position of the stator installed in the casing also needs to be positioned. It is easy to make mistakes during manual assembly, resulting in rework, and the assembly efficiency of the whole machine is low. Utility Model Content

[0004] In order to solve the technical problems of the inner rotor motor in the prior art, such as the complex assembly process of the stator and the housing, high production cost, and easy misassembly of the circuit board resulting in rework, the utility model provides an inner rotor brushless motor that is easy to assemble to solve the above problems.

[0005] The utility model adopts the following technical solution to solve the technical problem: an inner rotor brushless motor which is easy to assemble, comprising a housing assembly, a stator assembly, a rotor assembly, a circuit board and a positioning assembly; the stator assembly is installed in the housing assembly and is clearance-matched with the housing assembly; the rotor assembly is located in the stator assembly, is rotationally connected with the housing assembly and has two ends passing through the housing assembly; the circuit board is installed at one end of the stator assembly and is sleeved on the outside of the rotor assembly; the positioning assembly comprises a first asymmetric positioning mechanism arranged between the stator assembly and the housing assembly and a second asymmetric positioning mechanism arranged between the stator assembly and the circuit board, so that the circuit board, the stator assembly and the housing assembly form a unique connection relationship.

[0006] Furthermore, the first asymmetric positioning mechanism includes:

[0007] Two or more positioning ribs are fixed on the inner wall of the shell component, and the positioning ribs are arranged in a non-centrally symmetrical and non-circular array with respect to the shell component; positioning grooves are opened on the outer wall of the stator component and correspond to the positioning ribs.

[0008] Furthermore, the shell assembly includes a rear end cover, a casing and a front end cover, the rear end cover and the front end cover are fixed by screws, and the positioning ribs extend axially to both ends of the casing, and both ends of the positioning ribs are chamfered.

[0009] Furthermore, the inner wall of the casing has a first guide groove corresponding to the screws one by one, and a convex column is formed on the corresponding outer wall of the first guide groove. The outer wall of the stator assembly has a second guide groove opposite to the first guide groove, and the first guide groove and the second guide groove form a slot hole for the screw to pass through.

[0010] Furthermore, the outer wall of the housing is provided with heat dissipation ribs.

[0011] Furthermore, the second asymmetric mechanism includes:

[0012] Two or more rivet posts are fixed at one end of the stator assembly, and the rivet posts are arranged in a non-centrally symmetrical and non-circular array with respect to the stator assembly; riveting holes are opened on the circuit board and correspondingly matched with the rivet posts.

[0013] Furthermore, the rivet holes and the rivet studs are connected by hot riveting.

[0014] Furthermore, the rivet column includes a riveting portion and a limiting portion, the end of the limiting portion forms a limiting surface abutting against the circuit board, and the riveting portion is a buckle that is inserted into the riveting hole.

[0015] Furthermore, the rotor assembly includes a rotor core and magnetic tiles. A plurality of axially penetrating mounting grooves are provided inside the rotor core. The plurality of mounting grooves are evenly distributed along the circumferential direction, and the magnetic tiles are installed in the mounting grooves.

[0016] Furthermore, the casing is formed by extrusion of aluminum profiles.

[0017] The beneficial effects of the utility model are:

[0018] (1) The utility model uses the first asymmetric positioning mechanism and the second asymmetric positioning mechanism to form a unique connection relationship between the circuit board, the stator assembly and the housing assembly, so as to prevent errors during assembly, achieve precise installation, and improve assembly efficiency. At the same time, the housing assembly and the stator assembly are clearance-matched, and the first positioning mechanism is used to ensure that the two are firmly connected. Compared with the shrink-fit connection, the production cost is reduced.

[0019] (2) The utility model provides at least two positioning ribs on the inner wall of the casing to ensure the connection stability between the casing and the stator assembly. The two ends of the positioning ribs are chamfered to facilitate quick assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1 It is a schematic diagram of the circuit board and the stator assembly being fixed by screws in the prior art;

[0022] Figure 2 yes Figure 1 The enlarged image at a in the middle;

[0023] Figure 3 It is an exploded diagram of the assembly structure of the circuit board and the stator assembly in the prior art;

[0024] Figure 4 It is an exploded view of a specific implementation of the inner rotor brushless motor that is easy to assemble according to the utility model;

[0025] Figure 5 It is a top view of the casing of the utility model;

[0026] Figure 6 It is an axial cross-sectional view of the casing of the utility model;

[0027] Figure 7 It is a top view of the stator assembly in the utility model;

[0028] Figure 8 It is a schematic diagram of the assembly of the stator assembly and the housing in the utility model;

[0029] Fig. 9 It is a top view of the circuit board in the utility model;

[0030] Fig.10 This is a schematic diagram of the riveting structure of the circuit board and the stator assembly in the utility model;

[0031] Fig.11 It is a three-dimensional diagram of the casing of the utility model;

[0032] Fig.12 It is a schematic diagram of a specific implementation of the rivet stud in the utility model;

[0033] Fig.13 It is a structural schematic diagram of the rotor assembly in the utility model;

[0034] Fig.14 It is a front view of a surface mounted rotor assembly in the prior art.

[0035] In the figure, 1, shell assembly, 101, rear end cover, 102, casing, 103, front end cover, 2, stator assembly, 3, rotor assembly, 301, rotor core, 302, magnetic tile, 4, circuit board, 5, positioning rib, 501, chamfer, 6, screw, 7, heat dissipation rib, 8, rivet column, 801, riveting part, 802, limiting part, 803, limiting surface, 804, buckle, 9, riveting hole, 10, first guide groove, 11, boss, 12, second guide groove, 13, mounting groove, 14, first screw, 15, positioning groove. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] Embodiment 1

[0038] like Figure 4-Figure 10 As shown, an inner rotor brushless motor that is easy to assemble includes a housing assembly 1, a stator assembly 2, a rotor assembly 3, a circuit board 4 and a positioning assembly; the stator assembly 2 is installed in the housing assembly 1; the rotor assembly 3 is located in the stator assembly 2, is rotatably connected to the housing assembly 1 and has both ends passing through the housing assembly 1; the circuit board 4 is installed at one end of the stator assembly 2 and is sleeved on the outside of the rotor assembly 3; the positioning assembly includes a first asymmetric positioning mechanism arranged between the stator assembly 2 and the housing assembly 1 and a second asymmetric positioning mechanism arranged between the stator assembly 2 and the circuit board 4, so that the circuit board 4, the stator assembly 2 and the housing assembly 1 form a unique connection relationship.

[0039] The utility model can uniquely determine the assembly relationship of the circuit board 4, the stator assembly 2 and the housing assembly 1 through two asymmetric positioning mechanisms, and will not cause wrong assembly, thereby avoiding rework. The assembly of the stator assembly 2 and the housing assembly 1 is improved from the traditional shrink fit interference fit to a clearance fit, and no special shrink fit equipment is required. At the same time, the first asymmetric positioning mechanism is used to compensate for the matching strength of the two, so the installation difficulty and production cost are reduced, and the assembly efficiency of the whole machine is greatly improved.

[0040] The shell assembly 1 generally includes a rear end cover 101, a housing 102 and a front end cover 103. The rear end cover 101 and the front end cover 103 are fixed by screws 6. Both the front end cover 103 and the rear end cover 101 are provided with mounting holes for connecting the screws 6. The housing 102 is clamped between the front end cover 103 and the rear end cover 101.

[0041] The first asymmetric positioning mechanism comprises:

[0042] like Figure 5-Figure 8As shown, two or more positioning ribs 5 are fixed on the inner wall of the housing assembly 1, and the positioning ribs 5 are arranged in a non-central symmetric and non-circular array with respect to the housing assembly 1; the positioning grooves 15 are provided on the outer wall of the stator assembly 2 and are matched with the positioning ribs 5. The positioning ribs 5 can be an odd number or an even number. When the positioning ribs 5 are an odd number, each positioning rib 5 is arranged in a non-circular array with respect to the housing assembly 1. At this time, the positional relationship between the housing assembly 1 and the stator assembly 2 can be uniquely determined, and the number of positioning ribs 5 is three or more, so that the housing assembly 1 and the stator assembly 2 are more firmly connected under the premise of convenient installation. When the positioning ribs 5 are an even number, each positioning rib 5 is arranged in a non-central symmetric manner with respect to the housing assembly 1, and the non-central symmetric arrangement includes both a non-circular array and a non-axisymmetric arrangement. At this time, the positional relationship between the housing assembly 1 and the stator assembly 2 can be uniquely determined. Since the housing 102 and the stator assembly 2 are clearance-matched, two or more positioning ribs 5 can be provided to make the connection between the two more secure and prevent the housing 102 and the stator assembly 2 from sliding relative to each other. In this embodiment, two positioning ribs 5 are provided, and the positioning ribs 5 protrude from the inner surface of the housing 102 .

[0043] like Figure 6 As shown, the positioning rib 5 preferably extends to both ends of the housing 102 along the axial direction of the housing 102, and the positioning groove 15 can be located only at the end of the stator assembly 2, which can play a guiding and positioning role. During installation, the positioning groove 15 at one end is inserted into the positioning rib 5, and then the stator assembly 2 is completely installed into the housing 102 along the positioning rib 5. It is preferred to process chamfers 501 at both ends of the positioning rib 5, so that the stator assembly 2 has a good guiding and stabilizing effect when assembling, which is convenient for rapid assembly.

[0044] The housing 102 is made of a material with good thermal conductivity. In a preferred embodiment of the present invention, the housing 102 is formed by extrusion of an aluminum profile. Compared with the traditional housing 102 made of iron material, it has good heat dissipation, light weight and does not require surface anti-rust treatment.

[0045] To improve the heat dissipation effect, the outer wall of the housing 102 is provided with heat dissipation ribs 7 (such as Fig.11 As shown). This increases the contact area between the housing 102 and the external environment, further enhancing the heat dissipation performance of the motor, so that the motor can maintain a good performance state for a long time.

[0046] The second asymmetric mechanism comprises:

[0047] like Fig. 9 and Fig.10As shown, two or more rivet posts 8 are fixed at one end of the stator assembly 2 and arranged in a non-center-symmetric and non-circular array with respect to the stator assembly 2; riveting holes 9 are opened on the circuit board 4 and correspondingly cooperate with the rivet posts 8. Similar to the arrangement principle of the first asymmetric mechanism, the number of rivet posts 8 is also divided into an even number and an odd number. When the non-center-symmetric arrangement corresponds to an even number of rivet posts 8, the above arrangement can ensure that the relative angle between the Hall element installed on the circuit board 4 and the pole teeth of the stator core is installed correctly.

[0048] The rivet hole 9 and the rivet column 8 can be connected by hot riveting, that is, the rivet column 8 is heated by hot air to soften the connection part, and then pressure is applied to connect the circuit board 4 and the rivet column 8 together. Compared with the traditional fixing with the first screw 14, this connection method is simple to operate, firmly installed, and can withstand greater external force.

[0049] The rivet holes 9 and the rivet posts 8 can also be interlocked, such as Fig.12 As shown, the rivet column 8 includes a riveting portion 801 and a limiting portion 802. The end of the limiting portion 802 forms a limiting surface 803 that abuts against the circuit board 4. The riveting portion 801 is a buckle 804 that is inserted into the riveting hole 9. The buckle 804 is engaged in the riveting hole 9 to achieve the connection between the two. After the buckle 804 is connected, hot riveting can also be used for further fixing.

[0050] The inner rotor brushless motor of this embodiment can be applied to the field of servo motor drive and control integrated system.

[0051] Embodiment 2

[0052] Based on the first embodiment, Figure 5 and Figure 8 As shown, the inner wall of the housing 102 has a first guide groove 10 corresponding to the screw 6, and a boss 11 is formed on the outer wall corresponding to the first guide groove 10. The outer wall of the stator assembly 2 has a second guide groove 12 directly opposite to the first guide groove 10. The first guide groove 10 and the second guide groove 12 form a slot for the screw 6 to pass through. In a conventional motor, the hole on the housing 102 for the screw 6 to pass through is located inside the wall of the housing 102, and is not connected to the inner surface and the outer surface of the housing 102. Therefore, the thickness of the conventional housing 102 is inconsistent in the circumferential direction, and uniform strength cannot be guaranteed.

[0053] In this embodiment, the first guide groove 10 is processed from the inner wall of the casing 102, and the material at the first guide groove 10 is extruded to the outside of the casing 102 to form a boss 11, so that the thickness of the casing 102 in the circumferential direction remains consistent, and the inner surface of the casing 102 has no protruding structure and is still a circular surface. The cross-section of the first guide groove 10 forms more than a semicircle, and most of the structure of the screw 6 is located in the first guide groove 10, and only a small part is located in the second guide groove 12. The screw 6 between the first guide groove 10 and the second guide groove 12 can also strengthen the connection strength between the casing 102 and the stator assembly 2.

[0054] The inner rotor brushless motor of this embodiment can be applied to the field of servo motor drive and control integrated system.

[0055] Embodiment 3

[0056] Based on the above embodiments, the rotor assembly 3 in this embodiment includes a rotor core 301 and a magnetic tile 302 . The rotor core 301 is provided with a plurality of axially penetrating mounting grooves 13 . The plurality of mounting grooves 13 are evenly distributed along the circumferential direction, and the magnetic tile 302 is installed in the mounting grooves 13 .

[0057] like Fig.13 As shown, four mounting slots 13 penetrating the rotor core 301 are evenly distributed around the inside of the rotor core 301 , and the magnetic tiles 302 are divided into N poles and S poles, which are symmetrically distributed in pairs.

[0058] Conventional surface mounted rotor assembly 3, such as Fig.14 As shown, four evenly distributed notches are processed on the outer surface of the rotor core 301 , and the N poles and S poles of the magnetic tiles 302 are symmetrically distributed on the outer surface of the rotor core 301 .

[0059] In an inner rotor motor, when the motor speed is high, a large centrifugal force will be generated, which makes it easy for the magnetic tiles 302 of the surface-mounted rotor structure to fall off, causing damage to the motor. Therefore, we adopt an embedded rotor structure. When the centrifugal force is very large, the magnetic tiles 302 can be firmly embedded in the rotor core 301, thereby avoiding the occurrence of the magnetic tiles 302 falling off and ensuring the structural stability of the rotor assembly 3.

[0060] The inner rotor brushless motor of this embodiment can be applied to the field of servo motor drive and control integrated system.

[0061] In the description of the present invention, it is necessary to understand that the terms "inside", "outside", "axial", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0062] Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0063] In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments.

[0064] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An inner rotor brushless motor that is easy to assemble, characterized in that: include: Housing assembly (1); The stator assembly (2) is installed in the housing assembly (1) and is clearance-matched with the housing assembly (1); A rotor assembly (3) is located inside the stator assembly (2), is rotatably connected to the housing assembly (1), and has two ends that penetrate the housing assembly (1); A circuit board (4) is mounted on one end of the stator assembly (2) and sleeved on the outside of the rotor assembly (3); The positioning assembly comprises a first asymmetric positioning mechanism arranged between the stator assembly (2) and the housing assembly (1) and a second asymmetric positioning mechanism arranged between the stator assembly (2) and the circuit board (4), so that the circuit board (4), the stator assembly (2) and the housing assembly (1) form a unique connection relationship.

2. The easily assembled inner rotor brushless motor according to claim 1, characterized in that: The first asymmetric positioning mechanism comprises: Two or more positioning ribs (5) are fixed to the inner wall of the shell component (1), and the positioning ribs (5) are arranged in a non-centrosymmetric and non-circular array with respect to the shell component (1); The positioning groove (15) is formed on the outer wall of the stator assembly (2) and corresponds to the positioning rib (5).

3. The easily assembled inner rotor brushless motor according to claim 2, characterized in that: The housing assembly (1) comprises a rear end cover (101), a housing (102) and a front end cover (103); the rear end cover (101) and the front end cover (103) are fixed by screws (6); the positioning rib (5) extends axially to both ends of the housing (102); both ends of the positioning rib (5) are processed with chamfers (501).

4. The easily assembled inner rotor brushless motor according to claim 3, characterized in that: The inner wall of the housing (102) has a first guide groove (10) corresponding to the screw (6) one by one, and a convex column (11) is formed on the outer wall corresponding to the first guide groove (10). The outer wall of the stator assembly (2) has a second guide groove (12) directly opposite to the first guide groove (10), and the first guide groove (10) and the second guide groove (12) form a slot hole for the screw (6) to pass through.

5. The easily assembled inner rotor brushless motor according to claim 3, characterized in that: The outer wall of the casing (102) is provided with heat dissipation ribs (7).

6. The easily assembled inner rotor brushless motor according to any one of claims 1 to 5, characterized in that: The second asymmetric positioning mechanism comprises: Two or more rivet posts (8) are fixed to one end of the stator assembly (2), and the rivet posts (8) are arranged in a non-centrally symmetrical and non-circular array with respect to the stator assembly (2); The riveting holes (9) are formed on the circuit board (4) and correspond to the rivet posts (8).

7. The easily assembled inner rotor brushless motor according to claim 6, characterized in that: The rivet hole (9) and the rivet column (8) are connected by hot riveting.

8. The easily assembled inner rotor brushless motor according to claim 6, characterized in that: The rivet column (8) comprises a riveting portion (801) and a limiting portion (802), the end of the limiting portion (802) forms a limiting surface (803) abutting against the circuit board (4), and the riveting portion (801) is a buckle (804) that is snapped into the riveting hole (9).

9. The easily assembled inner rotor brushless motor according to claim 1, characterized in that: The rotor assembly (3) comprises a rotor core (301) and a magnetic tile (302); a plurality of axially penetrating mounting grooves (13) are provided inside the rotor core (301); the plurality of mounting grooves (13) are evenly distributed along the circumferential direction; and the magnetic tile (302) is mounted in the mounting grooves (13).

10. The easily assembled inner rotor brushless motor according to claim 3, characterized in that: The housing (102) is formed by extrusion of aluminum profiles.

Images