Outer rotor motor structure with circuit board arranged outside support, stator and rotor

Abstract

The utility model relates to an outer rotor motor structure with a circuit board arranged outside a support, a stator and a rotor. The technical problem that an existing outer rotor motor control panel is difficult to assemble and disassemble is solved. Comprising an inner stator and an outer rotor rotationally arranged on the circumferential outer side of the inner stator in a sleeving mode, one end of the outer rotor is closed, the other end of the outer rotor is open, a rotating shaft rotationally penetrates through the center of the inner stator, and one end of the rotating shaft is connected with the closed end of the outer rotor while the other end of the rotating shaft penetrates out of the open end of the outer rotor to form an output end. A support body fixedly connected with the inner stator through a support fixing structure is arranged on the outer side of the open end of the outer rotor, a circuit board body is arranged on one side of the support body through a circuit board mounting structure, and the output end of the rotating shaft sequentially penetrates through the support body and the circuit board body and extends to the side, away from the outer rotor, of the support body. The advantages are that the support mounting plate can conveniently mount the circuit board body towards one side far away from the outer rotor through the circuit board mounting structure, and the circuit board body can be conveniently mounted, dismounted and maintained.

Description

Technical Field

[0001] This utility model belongs to the technical field of external rotor motor equipment, specifically relating to an external rotor motor structure in which the circuit board is placed on the outside of the support, stator and rotor. Background Technology

[0002] In modern industry and daily life, external rotor motors are widely used in drones, ventilation equipment, power tools, and many other fields due to their advantages such as compact structure, high torque, and good heat dissipation. Currently, most external rotor motors employ a design that places the control board inside the motor. This design, to a certain extent, ensures the compactness and integration of the overall motor structure, reduces external environmental interference to the control board, and improves system stability. However, because the control board is installed inside the motor in a relatively confined space, the installation and disassembly process is extremely complex. Installation requires multiple steps of disassembly, which is cumbersome, consuming significant time and labor costs, and demanding a high level of technical skill from the operators. Furthermore, when the control board malfunctions, the built-in design greatly increases the difficulty of detection and replacement, leading to prolonged equipment downtime, impacting production efficiency and normal equipment operation, and causing significant inconvenience to users. At the same time, the frequent and complex disassembly and assembly process also reduces the motor's lifespan and increases equipment maintenance costs. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by providing an external rotor motor structure in which the circuit board is placed on the outside of the support, stator, and rotor.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An external rotor motor structure with a circuit board placed outside a support, stator, and rotor includes an inner stator and an external rotor rotatably sleeved around the inner stator. One end of the external rotor is closed, and the other end is open. A rotating shaft is rotatably inserted through the center of the inner stator. One end of the rotating shaft is connected to the closed end of the external rotor, and the other end of the rotating shaft extends through the open end of the external rotor to form an output end. A support body is provided outside the open end of the external rotor and is fixedly connected to the inner stator via a support fixing structure. A circuit board body is mounted on the side of the support body away from the external rotor via a circuit board mounting structure. The output end of the rotating shaft passes through the support body and the circuit board body sequentially and extends to the side of the support body away from the external rotor. The support fixing structure facilitates the fixed installation of one end of the support body inside the inner stator, improving the connection stability between the support body and the inner stator. The circuit board mounting structure facilitates the fixed connection between the circuit board body and the support body, improving the loading and unloading efficiency of the circuit board body and ensuring the installation stability of the circuit board body.

[0005] In the aforementioned external rotor motor structure where the circuit board is placed outside the support, stator, and rotor, the external rotor is cylindrical and the inner stator, external rotor, and shaft are coaxially arranged. This improves structural compactness, ensures uniform magnetic circuit, increases motor output efficiency, reduces motor loss and heat generation, extends motor lifespan, and facilitates the installation and maintenance of the external rotor, inner stator, and shaft.

[0006] In the aforementioned external rotor motor structure where the circuit board is placed outside the support, stator, and rotor, one end of the inner stator does not extend beyond the open end of the outer rotor, and one end of the rotating shaft is connected to the center of the closed end of the outer rotor. This ensures uniform magnetic field distribution, improves motor efficiency, and makes the inner stator and outer rotor more compact, reducing the overall space occupied by the motor and facilitating its installation.

[0007] In the aforementioned external rotor motor structure where the circuit board is placed outside the support, stator, and rotor, the support body includes a support cylinder. The rotating shaft passes through the support cylinder via a rotatable mounting structure. One end of the support cylinder is fixedly connected to the inner stator via the aforementioned support fixing structure. The other end of the support cylinder extends to the outside of the open end of the outer rotor, and the support cylinder has several support mounting plates extending radially outward along its circumferential outer side. The rotatable mounting structure facilitates the rotating shaft's rotation within the support cylinder, and the support cylinder facilitates its fixed mounting to the inner circumferential inner side of the inner stator via the support fixing structure, ensuring the connection stability between the support body and the inner stator. The circuit board is easily fixed onto the support body via the support mounting plates, improving the circuit board's installation efficiency.

[0008] In the aforementioned external rotor motor structure in which the circuit board is placed outside the bracket, stator, and rotor, the bracket cylinder has an annular portion that is integrally connected to the bracket cylinder at one end of the open end of the external rotor. The bracket mounting plates are three in number and are uniformly circumferentially formed on the outside of the annular portion. The annular portion facilitates the installation and positioning of the bracket mounting plates and limits the circuit board. One side of the circuit board, which is sleeved on the bracket cylinder, abuts against the annular portion.

[0009] In the aforementioned external rotor motor structure where the circuit board is placed on the outside of the bracket, stator, and rotor, the bracket fixing structure includes a stator mounting hole located at the center of the inner stator. One end of the bracket cylinder is inserted into the stator mounting hole. The outer circumferential side of the bracket cylinder has at least one protruding rib extending axially along the bracket cylinder and abutting against the inner wall of the stator mounting hole. An installation limiting component is provided between the bracket cylinder and the inner stator. The stator mounting hole facilitates the positioning and insertion of the bracket cylinder, improving the installation efficiency of the bracket cylinder. The protruding rib allows the bracket cylinder to abut against the inner circumferential side of the inner stator, improving the insertion stability. The installation limiting component limits the inner stator, preventing it from extending beyond the open end and ensuring motor operating efficiency.

[0010] In the aforementioned external rotor motor structure where the circuit board is placed on the outside of the support, stator, and rotor, the installation limiting component includes several limiting protrusions arranged on the circumferential outer side of the support cylinder. One end of each limiting protrusion extends to one side of the annular portion, and the other end abuts against one end face of the inner stator. The limiting protrusions can limit the inner stator, effectively preventing the inner stator from exceeding the open end. Furthermore, the protrusion and the adjacent limiting protrusion are an integral structure, which can improve the structural strength and ensure the limiting connection effect.

[0011] In the aforementioned external rotor motor structure where the circuit board is placed on the outside of the bracket, stator, and rotor, the circuit board mounting structure includes a circuit board hole located at the center of the circuit board body. One end of the bracket cylinder is inserted into the circuit board hole. The bracket mounting plate has mounting portions on the side away from the external rotor that abut against one side of the circuit board body. Each mounting portion has a circuit board mounting hole penetrating the bracket mounting plate. The circuit board body has circuit board positioning holes corresponding to the circuit board mounting holes. The circuit board positioning holes are connected to the circuit board mounting holes by circuit board mounting bolts. The circuit board holes facilitate the circuit board body to be fitted onto the bracket cylinder, improving the positioning and installation efficiency of the circuit board body. Furthermore, the mounting portions, circuit board mounting bolts, and circuit board positioning holes enhance the connection stability between the circuit board body and the bracket mounting plate.

[0012] In the aforementioned external rotor motor structure in which the circuit board is placed on the outside of the support, stator and rotor, the rotating mounting structure includes bearings respectively disposed on the inner circumferential side of both ends of the support cylinder. Both ends of the rotating shaft are rotatably connected to the bearings. The bearings enable the rotating shaft to rotate stably within the support cylinder and effectively reduce friction and improve the rotating shaft's rotation efficiency.

[0013] In the aforementioned external rotor motor structure where the circuit board is placed on the outside of the support, stator, and rotor, the circuit board has a Hall sensor module corresponding to the external rotor. The Hall sensor module can receive the operating information of the external rotor, making it convenient for users to observe and control the working status of the external rotor.

[0014] Compared with existing technologies, the advantages of this utility model are:

[0015] 1. The bracket fixing structure and installation limiting components facilitate the fixed connection between the inner stator and the bracket body.

[0016] 2. The bracket mounting plate, through the circuit board mounting structure, allows the circuit board to be installed facing away from the outer rotor, which facilitates the installation, disassembly, and maintenance of the circuit board.

[0017] 3. The rotating mounting structure can support the shaft and ensure its rotation efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a structural schematic diagram from another perspective of this utility model.

[0020] Figure 3 This is a structural cross-sectional view of the present invention.

[0021] Figure 4 This is a schematic diagram of the structure of the installation limiting component in this utility model.

[0022] Figure 5 This is a schematic diagram of the circuit board body in this utility model.

[0023] In the diagram: Inner stator 1, Outer rotor 2, Closed end 21, Open end 22, Rotating shaft 3, Output end 31, Bracket fixing structure 4, Stator mounting hole 41, Rib 42, Bracket body 5, Circuit board body 51, Bracket cylinder 52, Annular part 521, Bracket mounting plate 53, Circuit board mounting structure 6, Circuit board hole 61, Mounting part 62, Circuit board mounting hole 63, Circuit board positioning hole 64, Rotary mounting structure 7, Bearing 71, Mounting limit assembly 8, Limiting protrusion 81. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1 , Figure 2 , Figure 3As shown, this invention relates to an external rotor motor structure with the circuit board positioned outside the support, stator, and rotor. It includes an inner stator 1 and an outer rotor 2 rotatably sleeved around the inner stator 1. One end of the outer rotor 2 is closed, and the other end is open. A rotating shaft 3 is rotatably inserted through the center of the inner stator 1. One end of the rotating shaft 3 is connected to the closed end 21 of the outer rotor 2, and the other end of the rotating shaft 3 extends through the open end 22 of the outer rotor 2 to form an output end 31. The rotating shaft 3, fixedly connected to the closed end 21, enables the outer rotor 2 to drive the rotating shaft 3 to rotate synchronously during rotation. A support fixing structure 4 is provided on the outer side of the open end 22 of the outer rotor 2, which is connected to the inner stator. A fixedly connected bracket body 5 has a circuit board body 51 on the side of the bracket body 5 away from the outer rotor 2 via a circuit board mounting structure 6. The output end 31 of the rotating shaft 3 passes through the bracket body 5 and the circuit board body 51 in sequence and extends to the side of the bracket body 5 away from the outer rotor 2. The bracket fixing structure 4 makes it easy to fix one end of the bracket body 5 inside the inner stator 1, which can improve the connection stability between the bracket body 5 and the inner stator 1. The circuit board mounting structure 6 makes it easy to fix the circuit board body 51 to the bracket body 5, which can improve the loading and unloading efficiency of the circuit board body 51 and ensure the installation stability of the circuit board body 51.

[0026] Specifically, the outer rotor 2 is cylindrical and the inner stator 1, outer rotor 2 and shaft 3 are coaxially arranged, which can improve the structural compactness, ensure the uniformity of the magnetic circuit, improve the motor output efficiency, reduce motor loss and heat generation, improve the service life of the motor, and facilitate the installation and maintenance of the outer rotor 2, inner stator 1 and shaft 3.

[0027] The inner stator 1 has one end that does not extend beyond the open end 22 of the outer rotor 2, and the shaft 3 has one end that is connected to the center of the closed end 21 of the outer rotor 2. This ensures a uniform magnetic field distribution, improves the motor's working efficiency, and makes the inner stator 1 and outer rotor 2 more compact, reducing the overall space occupied by the motor and facilitating its installation.

[0028] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the support body 5 includes a support cylinder 52. The rotating shaft 3 passes through the support cylinder 52 via a rotating mounting structure 7. One end of the support cylinder 52 is fixedly connected to the inner stator 1 via the aforementioned support fixing structure 4. The other end of the support cylinder 52 extends to the outside of the open end 22 of the outer rotor 2. The support cylinder 52 has several support mounting plates 53 extending radially outward along the outer side of the circumference. The rotating mounting structure 7 facilitates the rotating shaft 3 to be rotatably mounted inside the support cylinder 52. The support cylinder 52 facilitates its fixed mounting to the inner side of the inner stator 1 via the support fixing structure 4, ensuring the connection stability between the support body 5 and the inner stator 1. The circuit board 51 can be easily fixed on the support body 5 via the support mounting plates 53, improving the installation efficiency of the circuit board 51.

[0029] Furthermore, the bracket cylinder 52 has an annular portion 521 that is integrally formed with the bracket cylinder 52 at one end outside the open end 22 of the outer rotor 2. The bracket mounting plates 53 are three in number and are uniformly formed on the outside of the annular portion 521. The annular portion 521 facilitates the installation and positioning of the bracket mounting plates 53 and limits the circuit board 51. One side of the circuit board 51, which is sleeved on the bracket cylinder 52, abuts against the annular portion 521.

[0030] The bracket fixing structure 4 includes a stator mounting hole 41 located at the center of the inner stator 1. One end of the bracket cylinder 52 is inserted into the stator mounting hole 41. The bracket cylinder 52 has at least one rib 42 extending axially along the outer side of the circumference and abutting against the inner wall of the stator mounting hole 41. An installation limiting component 8 is provided between the bracket cylinder 52 and the inner stator 1. The stator mounting hole 41 facilitates the positioning and insertion of the bracket cylinder 52, improving the installation efficiency of the bracket cylinder 52. The rib 42 allows the bracket cylinder 52 to abut against the inner stator 1 circumferentially, improving the insertion stability. The installation limiting component 8 limits the inner stator 1, preventing it from exceeding the open end 22 and ensuring the motor's operating efficiency.

[0031] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the installation limiting component 8 includes several limiting protrusions 81 arranged on the outer side of the bracket cylinder 52. One end of each limiting protrusion 81 extends to one side of the annular portion 521 and the other end abuts against one end face of the inner stator 1. The limiting protrusions 81 can limit the inner stator 1, effectively preventing the inner stator 1 from exceeding the open end 22. The rib 42 and the adjacent limiting protrusions 81 are an integral structure, which can improve the structural strength and ensure the limiting connection effect.

[0032] The circuit board mounting structure 6 includes a circuit board hole 61 located at the center of the circuit board body 51. One end of the bracket cylinder 52 is inserted into the circuit board hole 61. The bracket mounting plate 53 has mounting portions 62 on the side away from the outer rotor 2 that abut against one side of the circuit board body 51. The mounting portions 62 are provided with circuit board mounting holes 63 that penetrate the bracket mounting plate 53. The circuit board body 51 is provided with circuit board positioning holes 64 that correspond one-to-one with the circuit board mounting holes 63. The circuit board positioning holes 64 are connected to the circuit board mounting holes 63 by circuit board mounting bolts. The circuit board hole 61 facilitates the circuit board body 51 to be fitted onto the bracket cylinder 52, improving the positioning and installation efficiency of the circuit board body 51. The mounting portions 62, circuit board mounting holes 63, and circuit board positioning holes 64 improve the connection stability between the circuit board body 51 and the bracket mounting plate 53.

[0033] Specifically, the rotating mounting structure 7 includes bearings 71 respectively disposed on the inner circumferential sides of both ends of the support cylinder 52. Both ends of the rotating shaft 3 are rotatably connected to the bearings 71. The bearings 71 enable the rotating shaft 3 to be stably rotated inside the support cylinder 52, and can effectively reduce friction and improve the rotation efficiency of the rotating shaft 3.

[0034] Combination Figure 1 , Figure 2 As shown, the circuit board 51 has a Hall sensor module corresponding to the outer rotor 2. The Hall sensor module can receive the operating information of the outer rotor 2, which makes it convenient for users to observe and control the working status of the outer rotor 2.

[0035] The principle of this embodiment is as follows: the bracket fixing structure 4 enables the bracket cylinder 52 to connect and support the inner stator 1, and the bracket cylinder 52 can limit the inner stator 1 through the installation limiting component 8, ensuring the connection stability between the bracket cylinder 52 and the inner stator 1. The bracket mounting plate 53 can be installed and connected to the circuit board body 51 through the circuit board mounting structure 6, which can fix the circuit board body 51 on the side away from the open end 22, which can facilitate the installation and disassembly of the circuit board body 51 and facilitate the maintenance of the circuit board body 51.

[0036] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0037] Although this document frequently uses terms such as inner stator 1, outer rotor 2, closed end 21, open end 22, rotating shaft 3, output end 31, bracket fixing structure 4, stator mounting hole 41, rib 42, bracket body 5, circuit board body 51, bracket cylinder 52, annular part 521, bracket mounting plate 53, circuit board mounting structure 6, circuit board hole 61, mounting part 62, circuit board mounting hole 63, circuit board positioning hole 64, rotating mounting structure 7, bearing 71, mounting limit assembly 8, and limit protrusion 81, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A circuit board placed outside a support, stator, and rotor of an external rotor motor structure, comprising an inner stator (1) and an outer rotor (2) rotatably sleeved on the circumferential outer side of the inner stator (1), wherein one end of the outer rotor (2) is closed and the other end is open, a rotating shaft (3) is rotatably inserted through the center of the inner stator (1), one end of the rotating shaft (3) is connected to the closed end (21) of the outer rotor (2), and the other end of the rotating shaft (3) extends through the open end (22) of the outer rotor (2) to form an output end (31), characterized in that, The outer rotor (2) has a bracket body (5) on the outside of the open end (22) that is fixedly connected to the inner stator (1) by a bracket fixing structure (4). The bracket body (5) away from the outer rotor (2) has a circuit board body (51) on the side of the bracket body (5) away from the outer rotor (2) by a circuit board mounting structure (6). The output end (31) of the rotating shaft (3) passes through the bracket body (5) and the circuit board body (51) in sequence and extends to the side of the bracket body (5) away from the outer rotor (2).

2. The external rotor motor structure with the circuit board placed outside the support, stator, and rotor according to claim 1, characterized in that, The outer rotor (2) is cylindrical and the inner stator (1), the outer rotor (2) and the shaft (3) are coaxially arranged.

3. The external rotor motor structure according to claim 1, wherein the circuit board is placed outside the support, stator, and rotor, is characterized in that, One end of the inner stator (1) does not extend beyond the open end (22) of the outer rotor (2), and one end of the rotating shaft (3) is connected to the center of the closed end (21) of the outer rotor (2).

4. The external rotor motor structure with the circuit board placed outside the support, stator, and rotor according to claim 1, 2, or 3, characterized in that, The support body (5) includes a support cylinder (52), the rotating shaft (3) passes through the support cylinder (52) through the rotating mounting structure (7), one end of the support cylinder (52) is fixedly connected to the inner stator (1) through the support fixing structure (4), and the other end of the support cylinder (52) extends to the outside of the open end (22) of the outer rotor (2), and the support cylinder (52) has a plurality of support mounting plates (53) extending radially outward along the outer side of the support cylinder (52).

5. The external rotor motor structure according to claim 4, wherein the circuit board is placed outside the support, stator, and rotor, is characterized in that, The bracket cylinder (52) has an annular portion (521) that is integrally formed with the bracket cylinder (52) at one end outside the open end (22) of the outer rotor (2). The bracket mounting plates (53) are three in number and are uniformly formed in the circumference and integrally formed on the outside of the annular portion (521).

6. The external rotor motor structure according to claim 5, wherein the circuit board is placed outside the support, stator, and rotor, is characterized in that, The bracket fixing structure (4) includes a stator mounting hole (41) located at the center of the inner stator (1). One end of the bracket cylinder (52) is inserted into the stator mounting hole (41). The bracket cylinder (52) has at least one rib (42) extending axially along the outer side of the bracket cylinder (52) and abutting against the inner wall of the stator mounting hole (41). An installation limiting component (8) is provided between the bracket cylinder (52) and the inner stator (1).

7. The external rotor motor structure according to claim 5, wherein the circuit board is placed outside the support, stator, and rotor, is characterized in that, The installation limiting component (8) includes several limiting protrusions (81) arranged on the outer side of the bracket cylinder (52). One end of each limiting protrusion (81) extends to one side of the annular portion (521) and the other end abuts against one end face of the inner stator (1).

8. The external rotor motor structure according to claim 4, wherein the circuit board is placed outside the support, stator, and rotor, is characterized in that, The circuit board mounting structure (6) includes a circuit board hole (61) located at the center of the circuit board body (51). One end of the bracket cylinder (52) is inserted into the circuit board hole (61). The bracket mounting plate (53) has mounting portions (62) on the side away from the outer rotor (2) that abut against one side of the circuit board body (51). The mounting portions (62) are respectively provided with circuit board mounting holes (63) that penetrate the bracket mounting plate (53). The circuit board body (51) is provided with circuit board positioning holes (64) that correspond one-to-one with the circuit board mounting holes (63). The circuit board positioning holes (64) are connected to the circuit board mounting holes (63) by circuit board mounting bolts.

9. The external rotor motor structure with the circuit board placed outside the bracket, stator, and rotor according to claim 4, characterized in that, The rotating mounting structure (7) includes bearings (71) respectively disposed on the inner side of both ends of the support cylinder (52), and the two ends of the rotating shaft (3) are rotatably connected to the bearings (71).

10. The external rotor motor structure according to claim 1, wherein the circuit board is placed outside the support, stator, and rotor, is characterized in that, The circuit board (51) has a Hall sensor module corresponding to the outer rotor (2).

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