External rotor motor

Abstract

The invention discloses an external rotor motor, and relates to the technical field of motors, the external rotor motor comprises a motor housing, a motor shaft and at least two stator and rotor structures, the motor housing is provided with an inner cavity and a mounting hole communicated with the inner cavity; the motor shaft is arranged in the inner cavity in a penetrating manner and is rotationally connected to the mounting hole; the two stator and rotor structures are mounted in the inner cavity; the two stator and rotor structures are arranged at intervals along the radial direction of the motor shell; and each stator-rotor structure is used for driving the motor shaft to rotate in the inner cavity when being electrified. According to the technical scheme provided by the invention, the motor power density and the torque density of the outer rotor motor can be improved by arranging a plurality of groups of stator and rotor structures in a limited space.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an outer rotor motor. Background Art

[0002] The rotor of an outrunner motor is located on the outside of the motor, while the stator is located on the inside. Outrunner motors generally have a larger rotational inertia, which allows them to produce larger torques at low speeds, making them suitable for applications that require high torque and constant speed. Outrunner motors generally have better heat dissipation performance and are relatively easy to repair because the location of the rotor and stator makes it easier to repair and replace parts.

[0003] With the continuous development of motor technology, in order to meet the needs of specific external rotor motor applications, traditional motor structures often use the method of increasing the motor diameter and axial size to improve the power density and torque density of the motor.

[0004] However, this method has obvious shortcomings in flat envelope motors with a large number of pole pairs (pole pairs ≥ 4). Due to the limitation of axial space size, the motor diameter is limited, resulting in the inability to effectively improve the motor power density and torque density, making it difficult to meet the product requirements for small size, high power density, and high torque density. Summary of the invention

[0005] The main purpose of the present invention is to provide an outer rotor motor, aiming to improve the motor power density and torque density of the outer rotor motor by arranging multiple sets of stator and rotor structures in a limited space.

[0006] In order to achieve the above object, the present invention provides an outer rotor motor, wherein the outer rotor motor comprises:

[0007] A motor housing, wherein the motor housing is provided with an inner cavity and a mounting hole communicating with the inner cavity;

[0008] a motor shaft, the motor shaft passing through the inner cavity and rotatably connected to the mounting hole; and

[0009] At least two stator-rotor structures are installed in the inner cavity; and the two stator-rotor structures are arranged at intervals along the radial direction of the motor housing; each stator-rotor structure is used to drive the motor shaft to rotate in the inner cavity when power is supplied.

[0010] In one embodiment, each of the stator-rotor structures includes at least one rotor and at least one stator, the stator and the rotor are both arranged circumferentially around the motor shaft, the rotor is connected to the inner cavity wall, and the stator is connected to the motor shaft.

[0011] In one embodiment, the outer rotor motor also includes a connecting frame and a fixing frame, the connecting frame is connected to the motor shaft and to the two stators; the fixing frame is connected to the inner cavity wall and to one of the rotors, the other rotor is connected to the inner cavity side wall, and each rotor is arranged adjacent to a stator.

[0012] In one embodiment, the connecting frame comprises:

[0013] A connecting tube, wherein the connecting tube is sleeved on the outer wall of the motor shaft;

[0014] A connecting plate, the connecting plate being connected to the outer wall of the connecting tube, the connecting plate extending in the radial direction of the motor housing; and

[0015] At least one mounting tube, each of which is connected to one side of the connecting plate and spaced apart from the connecting tube; one of the stators is connected to the outer wall of the connecting tube, and the other stator is connected to the inner wall of the mounting tube.

[0016] In one embodiment, the installation tube and the connecting tube are combined to form an installation position, the fixing frame extends into the installation position, and is spaced apart from the connecting tube and the installation tube.

[0017] In one embodiment, the fixing frame includes at least one fixing cylinder, one end of which is connected to the bottom wall of the inner cavity and is spaced apart from the connecting frame; a rotor is arranged on a fixing cylinder and is arranged opposite to a stator.

[0018] In one embodiment, the connecting frame is an insulating connecting frame;

[0019] And / or, the fixing frame is a conductive fixing frame.

[0020] In one embodiment, the outer rotor motor further includes a first bearing and a second bearing, the first bearing is mounted at the mounting hole, the second bearing is mounted on the bottom wall of the inner cavity, and both ends of the motor shaft are respectively connected to the first bearing and the second bearing.

[0021] In one embodiment, the motor housing comprises:

[0022] A shell, wherein the shell is provided with the inner cavity, the mounting hole and two countersunk holes, the two countersunk holes are connected to the inner cavity and are located at two ends of the shell, and the mounting hole is connected to the inner cavity through one of the countersunk holes; and

[0023] At least one end cover is installed at the installation hole, and the end cover is provided with a through hole; the motor shaft is rotatably connected to the installation hole and the two countersunk holes, and passes through the through hole.

[0024] The outer rotor motor of the technical solution of the present invention comprises a motor housing, a motor shaft and at least two stator-rotor structures, the motor housing is provided with an inner cavity and a mounting hole connected to the inner cavity; the motor shaft is passed through the inner cavity and is rotatably connected to the mounting hole; two stator-rotor structures are installed in the inner cavity; and the two stator-rotor structures are arranged at intervals along the radial direction of the motor housing; each stator-rotor structure is used to drive the motor shaft to rotate in the inner cavity when power is turned on. By adopting at least two stator-rotor structures and arranging them at intervals along the radial direction of the motor housing, each stator-rotor structure can effectively drive the motor shaft to rotate in the inner cavity. This layout method helps the two stator-rotor structures to output rotational torque simultaneously in the limited space of the inner cavity, thereby improving the motor power density and torque density of the outer rotor motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 A schematic structural diagram of an outer rotor motor provided by the present invention having two stator and rotor structures;

[0027] Figure 2 A schematic structural diagram of an outer rotor motor provided by the present invention having three stator and rotor structures.

[0028] Description of Figure Numbers:

[0029] 10. Motor housing; 10a. Inner cavity; 10b. Mounting hole; 10c. Countersunk hole; 11. Housing; 12. End cover; 20. Motor shaft; 30. Stator-rotor structure; 31. Rotor; 32. Stator; 40. Connecting frame; 41. Connecting cylinder; 42. Connecting plate; 43. Mounting cylinder; 40a. Mounting position; 50. Fixing frame; 60. First bearing; 70. Second bearing.

[0030] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] The invention provides an outer rotor motor.

[0035] See also Figure 1 and Figure 2 In one embodiment of the present invention, the outer rotor motor includes a motor housing 10, a motor shaft 20 and at least two stator-rotor structures 30. The motor housing 10 is provided with an inner cavity 10a and a mounting hole 10b connected to the inner cavity 10a; the motor shaft 20 is passed through the inner cavity 10a and is rotatably connected to the mounting hole 10b; the two stator-rotor structures 30 are installed in the inner cavity 10a; and the two stator-rotor structures 30 are arranged at intervals along the radial direction of the motor housing 10; each stator-rotor structure 30 is used to drive the motor shaft 20 to rotate in the inner cavity 10a when power is supplied.

[0036] The motor housing 10 is made of high-strength material, has good mechanical strength and insulation performance, and ensures that the motor can run stably in harsh environments. The motor shaft 20 is made of high-quality stainless steel, has high strength and wear resistance, and ensures the stability and reliability of the motor when running at high speed.

[0037] The two stator and rotor structures 30 are arranged at intervals along the radial direction of the motor housing 10. The stator and rotor structures 30 are respectively installed in the inner cavity 10a and connected to the motor shaft 20. When the power is turned on, the current passes through the stator and rotor structures 30, so that the stator and rotor structures 30 generate a magnetic field, and the magnetic field interacts with the rotor 31 part in the stator and rotor structures 30 to generate a torque, and the torque causes the motor shaft 20 to rotate in the inner cavity 10a. The rotation of the motor shaft 20 drives the external load to realize the operation of the motor.

[0038] The present invention adopts at least two stator-rotor structures 30 and arranges them at intervals along the radial direction of the motor housing 10. Each stator-rotor structure 30 can effectively drive the motor shaft 20 to rotate in the inner cavity 10a. This layout helps the two stator-rotor structures 30 to output rotational torque simultaneously in the limited space of the inner cavity 10a, thereby improving the overall output torque of the motor, increasing the output power and efficiency of the motor, and meeting the requirements of high-efficiency operation.

[0039] Secondly, the stator and rotor structures 30 are arranged at intervals along the radial direction of the motor housing 10, which helps to reduce the size and weight of the motor. This design not only improves the compactness of the motor, facilitates installation and maintenance, but also helps to reduce the use of materials and reduce production costs.

[0040] The number of stator and rotor structures 30 of the present invention can be set according to actual needs. The stator and rotor structures 30 include two but are not limited to two; and each stator and rotor structure 30 is arranged around the output shaft and the side wall of the inner cavity 10a. The diameter of the stator and rotor structure 30 close to the output shaft is the smallest, and the diameter of the stator and rotor structure 30 close to the side wall of the inner cavity 10a is the largest.

[0041] The motor housing 10 includes a shell, a front cover and a rear cover. The shell has an inner cavity 10a and two mounting holes 10b. The two mounting holes 10b are connected to the inner cavity 10a and are located on two opposite sides of the shell. The front cover and the rear cover are respectively detachably connected to the two mounting holes 10b. The front cover is provided with a through hole, and one end of the output shaft used for connecting to an external load extends from the through hole of the front cover, so that the output shaft can be connected to the external load, thereby driving the load to rotate.

[0042] In one embodiment, see Figure 1 and Figure 2 Each stator-rotor structure 30 includes at least one rotor 31 and at least one stator 32 . The stator 32 and the rotor 31 are both arranged circumferentially around the motor shaft 20 . The rotor 31 is connected to the wall of the inner cavity 10 a , and the stator 32 is connected to the motor shaft 20 .

[0043] The rotor 31 is made of high-strength material with good electrical conductivity and magnetic conductivity, ensuring high efficiency and stability during motor operation. The rotor 31 is cylindrical and arranged around the output shaft; the rotor 31 is used to interact with the magnetic poles in the stator 32 to generate a rotational torque. The stator 32 is made of a material with good electrical conductivity and is provided with a plurality of windings inside. These windings are distributed according to a specific rule to generate a magnetic field corresponding to the rotor 31. The stator 32 is connected to the motor shaft 20 to ensure the stability of the stator 32 during motor operation. The rotor 31 is connected to the wall of the inner cavity 10a to ensure the stability of the rotor 31 during motor operation.

[0044] When the outer rotor motor is started, current is input into the winding of the stator 32, generating an alternating magnetic field. The alternating magnetic field interacts with the rotor 31 to generate a rotational torque. Since the rotor 31 is fixedly connected to the wall of the inner cavity 10a, the stator 32 rotates relative to the rotor 31 under the action of the rotational torque, thereby driving the motor to work.

[0045] The connection between the rotor 31 and the wall of the inner cavity 10a enables the rotor 31 to be firmly fixed in the inner cavity 10a, thereby improving the stability of the rotor 31. This not only helps to improve the operating efficiency of the motor, but also helps to protect the structure of the inner cavity 10a and prevent damage to the inner cavity 10a caused by vibration of the rotor 31.

[0046] Each stator-rotor structure 30 of the present invention, due to its unique circumferential arrangement around the motor shaft 20, makes the electromagnetic field distribution between the rotor 31 and the stator 32 more uniform during the operation of the motor, thereby effectively reducing the electromagnetic interference during the operation of the motor and improving the operating performance of the motor; and the cylindrical design of the rotor 31 and the stator 32 can further save the required installation space, thereby allowing a larger number of stator-rotor structures 30 to be arranged in the inner cavity 10a.

[0047] In one embodiment, see Figure 1 and Figure 2 The outer rotor motor also includes a connecting frame 40 and a fixing frame 50. The connecting frame 40 is connected to the motor shaft 20 and to the two stators 32. The fixing frame 50 is connected to the wall of the inner cavity 10a and to one of the rotors 31. The other rotor 31 is connected to the side wall of the inner cavity 10a, and each rotor 31 is arranged adjacent to a stator 32.

[0048] The connecting frame 40 is tightly connected to the motor shaft 20, and its main function is to connect the motor shaft 20 to the two stators 32. The design of the connecting frame 40 adopts high-strength materials to ensure the stability and reliability of the connection. The connecting frame 40 is provided with two connecting holes for connecting with the stator 32. The fixing frame 50 is connected to the wall of the inner cavity 10a, and its main function is to fix the rotor 31. The fixing frame 50 is provided with fixing holes for connecting with the rotor 31. The design of the fixing frame 50 makes the internal structure of the motor more compact and improves the stability of the rotor 31 in the motor.

[0049] The connection between the connecting frame 40 and the two stators 32 makes the coordination between the stators 32 more efficient, and improves the overall output performance of the motor. The close connection between the connecting frame 40 and the motor shaft 20 ensures the stability and reliability of the motor during operation. This structural design effectively overcomes the problems of unstable connection between the stators 32 in the prior art, which is prone to vibration and noise, and provides a strong guarantee for the efficient and stable operation of the motor.

[0050] Secondly, the connection between the fixing frame 50 and the cavity wall of the inner cavity 10a, and the connection with a rotor 31, provide strong support for the overall structure of the motor. This design not only enhances the mechanical strength of the motor, but also helps to maintain the relative position stability of the components inside the motor, avoiding performance degradation caused by vibration or displacement. In addition, the connection between another rotor 31 and the side wall of the inner cavity 10a, and the adjacent arrangement of each rotor 31 and a stator 32, so that the two rotors 31 can form a fixed connection relationship with the cavity side wall of the inner cavity 10a, so that the two rotors 31 are not easily displaced during the movement of the stator 32, and only a relatively small fixing frame 50 is designed to cooperate with a rotor 31 and the cavity wall of the inner cavity 10a to fix the two rotors 31, saving a part of the installation space.

[0051] In one embodiment, see Figure 1 and Figure 2 The connecting frame 40 includes a connecting tube 41, a connecting plate 42 and at least one mounting tube 43. The connecting tube 41 is sleeved on the outer wall of the motor shaft 20; the connecting plate 42 is connected to the outer wall of the connecting tube 41, and the connecting plate 42 is extended along the radial direction of the motor housing 10; the mounting tube 43 is connected to one side of the connecting plate 42 and is spaced apart from the connecting tube 41; one of the stators 32 is connected to the outer wall of the connecting tube 41, and the other stator 32 is connected to the inner wall of the mounting tube 43.

[0052] The connecting tube 41 is a cylindrical structure, and its outer part is sleeved on the outer wall of the motor shaft 20, and is fixed by fasteners to ensure a tight fit between the connecting tube 41 and the motor shaft 20. The connecting plate 42 is connected to the outer wall of the connecting tube 41, and the connecting plate 42 is extended along the radial direction of the motor housing 10. The connecting plate 42 is made of high-strength metal material to ensure the stability and durability of the connecting frame 40.

[0053] This embodiment includes two mounting cylinders 43, which are respectively located on one side of the connecting plate 42. The two mounting cylinders 43 are arranged at intervals along the radial direction of the motor housing 10 to maintain the balance and stability of the structure. The outer diameter of the connecting cylinder 41 matches the outer diameter of the motor shaft 20, and a fixing groove is provided inside to fix the motor shaft 20. The structural design of the connecting cylinder 41 enables it to withstand the vibration and torque generated when the motor is running. The connecting plate 42 is connected to the outer wall of the connecting cylinder 41 by welding or bolting. The connecting plate 42 is extended along the radial direction of the motor housing 10 so that a stable support is formed between the connecting frame 40 and the motor housing 10. Both mounting cylinders 43 are connected to one side of the connecting plate 42 by welding or bolting. The mounting cylinders 43 are arranged at intervals along the radial direction of the motor housing 10 so that the stator 32 can be evenly distributed inside the motor.

[0054] The connecting plate 42 is connected to the outer wall of the connecting tube 41, and the connecting plate 42 is extended along the radial direction of the motor housing 10. This layout not only makes the structure of the connecting frame 40 more compact, but also helps to achieve uniform force between the motor housing 10 and the connecting frame 40, thereby avoiding local stress concentration and improving the service life of the connecting frame 40.

[0055] The two stators 32 are respectively connected to the two mounting tubes 43 , so that the two stators 32 can form a fixed interval when moving, thereby preventing the two stators 32 from colliding when moving, thereby improving the movement stability of the stator-rotor structure 30 .

[0056] In one embodiment, see Figure 1 and Figure 2 The mounting tube 43 and the connecting tube 41 are combined to form a mounting position 40 a , and the fixing frame 50 extends into the mounting position 40 a and is spaced apart from the connecting tube 41 and the mounting tube 43 .

[0057] The mounting position 40a formed by the mounting tube 43 and the connecting tube 41 provides a fixed position for the fixing frame 50. The fixing frame 50 extends into the mounting position 40a, and its shape and size match the internal space of the mounting tube 43. The connecting tube 41 is connected to the end of the mounting tube 43 through the connecting plate 42. This structural design cleverly utilizes the spatial layout and effectively solves the problem of unstable and loose connections between components in the prior art. The space between the mounting tube 43 and the connecting tube 41 is utilized to achieve a reasonable layout of the fixing frame 50, which not only saves space, but also improves the compactness and aesthetics of the overall structure.

[0058] In one embodiment, see Figure 1 and Figure 2 The fixing frame 50 includes at least one fixing cylinder, one end of which is connected to the bottom wall of the inner cavity 10a and is spaced apart from the connecting frame 40; a rotor 31 is arranged on a fixing cylinder and is arranged opposite to a stator 32.

[0059] In this embodiment, a fixing cylinder is provided to be connected to the bottom wall of the inner cavity 10a, so that the fixing cylinder is connected to one of the rotors 31; and the other rotor 31 is connected to the side wall of the inner cavity 10a. In this way, the two rotors 31 can be fixed and a certain installation space can be saved, making the outer rotor motor structure more compact.

[0060] The size of the fixing tube can be set according to the size of the inner cavity 10 a , the stator 32 and the rotor 31 .

[0061] In one embodiment, see Figure 1 and Figure 2 The connecting frame 40 is an insulating connecting frame 40 ; the fixing frame 50 is a conductive fixing frame 50 .

[0062] Since the connecting frame 40 is made of insulating material, the multiple stators 32 fixed on the connecting frame 40 will not be electrically affected by each other during operation, which can effectively prevent current leakage and short circuit, and greatly reduce the risk of electrical accidents.

[0063] The use of the conductive fixing frame 50 ensures the stable transmission of current and avoids the problem of increased resistance and heating caused by poor contact, which not only improves the conductive efficiency of the entire system, but also helps to reduce energy consumption and improve energy utilization.

[0064] In one embodiment, see Figure 1 and Figure 2 The outer rotor motor also includes a first bearing 60 and a second bearing 70. The first bearing 60 is installed at the mounting hole 10b, and the second bearing 70 is installed on the bottom wall of the inner cavity 10a. The two ends of the motor shaft 20 are connected to the first bearing 60 and the second bearing 70 respectively.

[0065] The first bearing 60 is installed at the mounting hole 10b of the motor. The mounting hole 10b is located in the housing portion of the motor and is used to fix the first bearing 60. The structural design of the first bearing 60 enables it to withstand the radial and axial loads of the motor shaft 20 during rotation. During the installation process, technicians need to ensure the fit between the first bearing 60 and the mounting hole 10b to ensure the stability and rotation efficiency of the bearing. The second bearing 70 is installed on the bottom wall of the inner cavity 10a. The bottom wall of the inner cavity 10a is a structural part inside the motor, used to support and fix the second bearing 70. The design of the second bearing 70 enables it to withstand the axial load generated by the motor shaft 20 during rotation while maintaining the concentricity of the motor shaft 20.

[0066] When the motor is working, the magnetic field generated by the stator 32 acts on the rotor 31, so that the stator 32 starts to rotate relative to the rotor 31. The rotation of the stator 32 drives the motor shaft 20 to rotate, and the motor shaft 20 is supported by the first bearing 60 and the second bearing 70 to achieve stable rotation.

[0067] The stator 32 generates a magnetic field and starts to rotate relative to the rotor 31 under the action of magnetic force. The rotation of the stator 32 drives the motor shaft 20 to rotate. The motor shaft 20 is supported by the first bearing 60 and the second bearing 70 to achieve stable rotational motion. The rotation of the motor shaft 20 drives the motor to output torque, thereby achieving the operation of the motor.

[0068] Since the first bearing 60 and the second bearing 70 are respectively located at the two ends of the motor shaft 20, the axial and radial runout during the operation of the motor can be effectively reduced, making the motor run more smoothly, reducing mechanical wear caused by vibration, and extending the service life of the motor.

[0069] Annular grooves are respectively provided on the circumferential side walls of the output shaft adjacent to both ends. The first bearing 60 and the second bearing 70 are respectively clamped in the two annular grooves, so that the output shaft fits more closely with the first bearing 60 and the second bearing 70.

[0070] In one embodiment, the motor housing 10 includes a shell 11 and at least one end cover 12. The shell 11 is provided with an inner cavity 10a, a mounting hole 10b and two countersunk holes 10c. The two countersunk holes 10c are connected to the inner cavity 10a and are located at two ends of the shell 11. The mounting hole 10b is connected to the inner cavity 10a through one of the countersunk holes 10c. The end cover 12 is installed at the mounting hole 10b, and the end cover 12 is provided with a through hole. The motor shaft 20 is rotatably connected to the mounting hole 10b and the two countersunk holes 10c, and passes through the through hole.

[0071] In this embodiment, the shell 11 is made of high-strength aluminum alloy material and has good mechanical strength and corrosion resistance. The inner cavity 10a is located inside the shell 11 and is used to install the motor shaft 20 and related components. The mounting holes 10b are evenly distributed on the outer wall of the shell 11. In this embodiment, four mounting holes 10b are provided. The countersunk holes 10c are located at both ends of the shell 11 and are connected to the inner cavity 10a. In this embodiment, two countersunk holes 10c are provided. The end cover 12 is installed at the mounting hole 10b, and the shape of the end cover 12 matches the mounting hole 10b of the shell 11. The end cover 12 is provided with a perforation. In this embodiment, the diameter of the perforation is larger than the diameter of the motor shaft 20 to ensure that the motor shaft 20 can pass through smoothly. The material selection of the end cover 12 is the same as that of the shell 11 to ensure the overall mechanical strength and corrosion resistance.

[0072] The motor shaft 20 is rotatably connected to the mounting hole 10b and the two countersunk holes 10c, and passes through the perforation of the end cover 12. The material of the motor shaft 20 is stainless steel, which has high strength and wear resistance. The motor shaft 20 is connected to the housing 11 through the mounting hole 10b and the countersunk holes 10c, ensuring the stability and reliability of the motor shaft 20. When the motor is working, the motor shaft 20 rotates in the inner cavity 10a of the housing 11, and through the perforation of the end cover 12, the motor shaft 20 is connected to the external connection component to realize the driving function of the motor.

[0073] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An outer rotor motor, characterized in that: The outer rotor motor comprises: A motor housing, wherein the motor housing is provided with an inner cavity and a mounting hole communicating with the inner cavity; a motor shaft, the motor shaft passing through the inner cavity and rotatably connected to the mounting hole; and At least two stator-rotor structures are installed in the inner cavity; and the two stator-rotor structures are arranged at intervals along the radial direction of the motor housing; each stator-rotor structure is used to drive the motor shaft to rotate in the inner cavity when power is supplied.

2. The outer rotor motor according to claim 1, characterized in that: Each of the stator-rotor structures includes at least one rotor and at least one stator. The stator and the rotor are both arranged around the circumference of the motor shaft. The rotor is connected to the wall of the inner cavity, and the stator is connected to the motor shaft.

3. The outer rotor motor according to claim 2, characterized in that: The outer rotor motor also includes a connecting frame and a fixing frame, the connecting frame is connected to the motor shaft and to the two stators; the fixing frame is connected to the inner cavity wall and to one of the rotors, the other rotor is connected to the inner cavity side wall, and each rotor is arranged adjacent to a stator.

4. The outer rotor motor according to claim 3, characterized in that: The connecting frame comprises: A connecting tube, wherein the connecting tube is sleeved on the outer wall of the motor shaft; A connecting plate, the connecting plate being connected to the outer wall of the connecting tube, the connecting plate extending in the radial direction of the motor housing; and At least one mounting tube is connected to one side of the connecting plate and is spaced apart from the connecting tube; one of the stators is connected to the outer wall of the connecting tube, and the other stator is connected to the inner wall of the mounting tube.

5. The outer rotor motor according to claim 4, characterized in that: The installation tube and the connecting tube are combined to form an installation position, and the fixing frame extends into the installation position and is spaced apart from the connecting tube and the installation tube.

6. The outer rotor motor according to claim 3, characterized in that: The fixing frame includes at least one fixing cylinder, one end of which is connected to the bottom wall of the inner cavity and is spaced apart from the connecting frame; a rotor is arranged on a fixing cylinder and is arranged opposite to a stator.

7. The outer rotor motor according to claim 3, characterized in that: The connecting frame is an insulating connecting frame; And / or, the fixing frame is a conductive fixing frame.

8. The outer rotor motor according to any one of claims 1 to 7, characterized in that: The outer rotor motor also includes a first bearing and a second bearing, the first bearing is installed at the mounting hole, the second bearing is installed on the bottom wall of the inner cavity, and both ends of the motor shaft are connected to the first bearing and the second bearing respectively.

9. The outer rotor motor according to claim 8, characterized in that: The motor housing comprises: A shell, wherein the shell is provided with the inner cavity, the mounting hole and two countersunk holes, the two countersunk holes are connected to the inner cavity and are located at two ends of the shell, and the mounting hole is connected to the inner cavity through one of the countersunk holes; and At least one end cover is installed at the installation hole, and the end cover is provided with a through hole; the motor shaft is rotatably connected to the installation hole and the two countersunk holes, and passes through the through hole.

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