Inner rotor motor

Abstract

The invention discloses an inner rotor motor, and relates to the technical field of motors, the inner rotor motor comprises a motor housing, a motor shaft and at least two stator and rotor combined 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 combined structures are mounted in the inner cavity; the two stator and rotor combined structures are arranged at intervals along the radial direction of the motor shell; and each stator and rotor combined 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 inner 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 inner rotor motor. Background Art

[0002] Inner rotor motors are motors whose transmission parts are located inside the motor, while the outer shell remains static. This design makes inner rotor motors usually have a smaller rotating shaft inertia moment, which is conducive to miniaturization design and usually has better heat dissipation performance. Because the rotor is located inside the motor, inner rotor motors are usually more difficult to repair, especially the winding of the internal coil is relatively complicated.

[0003] With the continuous development of motor technology, in order to meet the needs of specific inner 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 inner rotor motor, aiming to improve the motor power density and torque density of the inner rotor motor by arranging multiple sets of stator and rotor structures in a limited space.

[0006] To achieve the above object, the present invention provides an inner rotor motor, the inner rotor motor comprising:

[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 combination structures are installed in the inner cavity; and the two stator-rotor combination structures are arranged at intervals along the radial direction of the motor housing; each stator-rotor combination 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 combination 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 motor shaft, and the stator is connected to the inner cavity wall.

[0011] In one embodiment, the inner rotor motor further includes a connecting frame and a fixing frame, the connecting frame is connected to the motor shaft and to the two rotors; the fixing frame is connected to the inner cavity wall and to one of the stators, the other stator 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 two mounting tubes are provided, both of which are connected to one side of the connecting plate, and the two mounting tubes are arranged at intervals along the radial direction of the motor housing; each of the rotors is connected to the outer wall of the mounting tube.

[0016] In one embodiment, a mounting position is formed between two adjacent mounting tubes and between one of the mounting tubes and the side wall of the inner cavity, and the fixing frame extends into the two mounting positions and is spaced apart from the connecting tube and the mounting tube.

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

[0018] In one embodiment, the fixing frame includes at least two fixing tubes, one end portion of the two fixing tubes is connected to the bottom wall of the inner cavity and is spaced apart from the connecting frame; each stator is arranged on the inner wall of a fixing tube and is arranged opposite to a rotor.

[0019] In one embodiment, the connecting frame is an insulating connecting frame;

[0020] And / or, the fixing frame is a conductive fixing frame.

[0021] In one embodiment, the inner 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.

[0022] The inner rotor motor of the technical solution of the present invention comprises a motor housing, a motor shaft and at least two stator-rotor combination 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 combination structures are installed in the inner cavity; and the two stator-rotor combination structures are arranged at intervals along the radial direction of the motor housing; each stator-rotor combination 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 combination structures and arranging them at intervals along the radial direction of the motor housing, each stator-rotor combination structure can effectively drive the motor shaft to rotate in the inner cavity. This layout method helps the two stator-rotor combination 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 inner rotor motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 A schematic structural diagram of an inner rotor motor provided by the present invention having two stator-rotor combination structures;

[0025] Figure 2 A structural schematic diagram of an inner rotor motor provided by the present invention having three stator-rotor combination structures.

[0026] Description of Figure Numbers:

[0027] 10. Motor housing; 10a. Inner cavity; 10b. Mounting hole; 20. Motor shaft; 30. Stator-rotor combination structure; 31. Rotor; 32. Stator; 40. Connecting frame; 41. Connecting cylinder; 42. Connecting plate; 43. Mounting cylinder; 40a. Mounting position; 50. Fixing frame; 51. Fixing cylinder; 60. First bearing; 70. Second bearing.

[0028] 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

[0029] 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.

[0030] 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.

[0031] 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.

[0032] The invention provides an inner rotor motor.

[0033] See also Figure 1 and Figure 2 In one embodiment of the present invention, the inner rotor motor includes a motor housing 10, a motor shaft 20 and at least two stator-rotor combination 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 combination structures 30 are installed in the inner cavity 10a; and the two stator-rotor combination structures 30 are arranged at intervals along the radial direction of the motor housing 10; each stator-rotor combination structure 30 is used to drive the motor shaft 20 to rotate in the inner cavity 10a when power is supplied.

[0034] 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.

[0035] Two stator-rotor combination structures 30 are arranged at intervals along the radial direction of the motor housing 10. The stator-rotor combination 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-rotor combination structure 30, so that the stator-rotor combination structure 30 generates a magnetic field, and the magnetic field interacts with the rotor 31 part in the stator-rotor combination structure 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.

[0036] The present invention adopts at least two stator-rotor combination structures 30 and arranges them at intervals along the radial direction of the motor housing 10. Each stator-rotor combination structure 30 can effectively drive the motor shaft 20 to rotate in the inner cavity 10a. This layout helps the two stator-rotor combination 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.

[0037] Secondly, the stator-rotor combination structure 30 is 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.

[0038] The number of stator-rotor combination structures 30 of the present invention can be set according to actual needs. The stator-rotor combination structures 30 include two but are not limited to two; and each stator-rotor combination structure 30 is arranged around the output shaft and the side wall of the inner cavity 10a. The diameter of the stator-rotor combination structure 30 close to the output shaft is the smallest, and the diameter of the stator-rotor combination structure 30 close to the side wall of the inner cavity 10a is the largest.

[0039] 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.

[0040] In one embodiment, see Figure 1 and Figure 2 Each stator-rotor combination structure 30 includes at least one rotor 31 and at least one stator 32. The stator 32 and the rotor 31 are both arranged around the circumference of the motor shaft 20. The rotor 31 is connected to the motor shaft 20, and the stator 32 is connected to the wall of the inner cavity 10a.

[0041] 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 has multiple windings arranged inside. These windings are distributed according to a specific rule to generate a magnetic field corresponding to the rotor 31. The outer circumference of the stator 32 is connected to the wall of the inner cavity 10a to ensure the stability of the stator 32 during motor operation.

[0042] When the motor starts, power is input to the winding of the stator 32 to generate an alternating magnetic field. The alternating magnetic field interacts with the rotor 31 to generate a rotational torque. Under the action of the rotational torque, the rotor 31 drives the motor shaft 20 to rotate, thereby driving the motor to work.

[0043] The connection between the stator 32 and the wall of the inner cavity 10a enables the stator 32 to be firmly fixed in the inner cavity 10a, thereby improving the stability of the stator 32. 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 the vibration of the stator 32.

[0044] Each stator-rotor combination 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 combination structures 30 to be arranged in the inner cavity 10a.

[0045] In one embodiment, see Figure 1 and Figure 2 The inner 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 rotors 31. The fixing frame 50 is connected to the wall of the inner cavity 10a and to one of the stators 32. The other stator 32 is connected to the side wall of the inner cavity 10a, and each rotor 31 is adjacent to a stator 32.

[0046] The connecting frame 40 is tightly connected to the motor shaft 20, and its main function is to connect the motor shaft 20 with the two rotors 31. 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 rotor 31. The fixing frame 50 is connected to the wall of the inner cavity 10a, and its main function is to fix the stator 32. The fixing frame 50 is provided with fixing holes for connecting with the stator 32. The design of the fixing frame 50 makes the internal structure of the motor more compact and improves the stability of the stator 32 in the motor.

[0047] The connection between the connecting frame 40 and the two rotors 31 makes the cooperation between the rotors 31 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 rotors 31 in the prior art, easy to generate vibration and noise, and provides a strong guarantee for the efficient and stable operation of the motor.

[0048] Secondly, the connection between the fixing frame 50 and the cavity wall of the inner cavity 10a, and the connection with the stator 32, 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 stator 32 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 stators 32 can form a fixed connection relationship with the side wall of the inner cavity 10a, so that the two stators 32 are not easily displaced during the movement of the rotor 31, and only a smaller fixing frame 50 is designed to cooperate with a stator 32 and the cavity wall of the inner cavity 10a to fix the two stators 32, saving a part of the installation space.

[0049] 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 two mounting tubes 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 two mounting tubes 43 are both connected to one side of the connecting plate 42, and the two mounting tubes 43 are arranged at intervals along the radial direction of the motor housing 10; each rotor 31 is connected to the outer wall of the mounting tube 43.

[0050] 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.

[0051] 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 rotor 31 can be evenly distributed inside the motor.

[0052] 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.

[0053] The two rotors 31 are respectively connected to the two mounting tubes 43 , so that the two rotors 31 can form a fixed interval when moving, thereby preventing the two rotors 31 from colliding when moving, thereby improving the movement stability of the stator-rotor combination structure 30 .

[0054] In one embodiment, see Figure 1 and Figure 2 A mounting position 40a is formed between two adjacent mounting tubes 43 and between one of the mounting tubes 43 and the side wall of the inner cavity 10a. The fixing frame 50 extends into the two mounting positions 40a and is spaced apart from the connecting tube 41 and the mounting tube 43.

[0055] The mounting position 40a formed between the two mounting cylinders 43 and the mounting position 40a formed between the mounting cylinder 43 and the side wall of the inner cavity 10a provide a fixed position for the fixing frame 50. The fixing frame 50 extends into the two mounting positions 40a, and its shape and size match the internal space of the mounting cylinder 43. The connecting cylinder 41 is connected to the ends of the two mounting cylinders 43 through the connecting plate 42.

[0056] The mounting position 40a formed by the two adjacent mounting tubes 43 and one of the mounting tubes 43 and the side wall of the inner cavity 10a is used to form a stable mounting of the fixing frame 50. 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 side wall of the inner cavity 10a 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.

[0057] In one embodiment, see Figure 1 and Figure 2 The fixed frame 50 includes at least one fixed cylinder 51, 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 stator 32 is arranged on the inner wall of a fixed cylinder 51 and is arranged opposite to a rotor 31.

[0058] In this embodiment, a fixing cylinder 51 is provided to be connected to the bottom wall of the inner cavity 10a, so that the fixing cylinder 51 is connected to one of the stators 32; and the other stator 32 is connected to the side wall of the inner cavity 10a. In this way, the two stators 32 can be fixed and a certain installation space can be saved, making the inner rotor motor structure more compact.

[0059] The size of the fixing tube 51 can be set according to the size of the inner cavity 10 a , the stator 32 , and the rotor 31 .

[0060] In one embodiment, see Figure 1 and Figure 2 The fixing frame 50 includes at least two fixing tubes 51 , one end portion of the two fixing tubes 51 is connected to the bottom wall of the inner cavity 10 a and is spaced apart from the connecting frame 40 ; each stator 32 is arranged on the inner wall of a fixing tube 51 and is arranged opposite to a rotor 31 .

[0061] In this embodiment, two fixed cylinders 51 are provided and connected to the bottom wall of the inner cavity 10a respectively. The two fixed cylinders 51 are arranged at intervals, and one of the fixed cylinders 51 is arranged at intervals from the connecting cylinder 41 of the connecting frame 40, and the other fixed cylinder 51 is arranged at intervals from the side wall of the inner cavity 10a; in this way, the two stators 32 are reinforced by fixed components, which improves the structural stability of the two stators 32 in the inner rotor motor, thereby making the inner rotor motor more stable when powered on.

[0062] 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 .

[0063] Since the connecting frame 40 is made of insulating material, the multiple rotors 31 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.

[0064] 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.

[0065] In one embodiment, see Figure 1 and Figure 2 The inner 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.

[0066] 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.

[0067] When the motor is working, the magnetic field generated by the stator 32 acts on the rotor 31, causing the rotor 31 to start rotating. The rotation of the rotor 31 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.

[0068] The stator 32 generates a magnetic field, and the rotor 31 starts to rotate under the action of the magnetic force. The rotation of the rotor 31 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 realizing the operation of the motor.

[0069] 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.

[0070] 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.

[0071] 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 inner rotor motor, characterized in that: The inner 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 combination structures are installed in the inner cavity; and the two stator-rotor combination structures are arranged at intervals along the radial direction of the motor housing; each stator-rotor combination structure is used to drive the motor shaft to rotate in the inner cavity when power is supplied.

2. The inner rotor motor according to claim 1, characterized in that: Each of the stator-rotor combination 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 motor shaft, and the stator is connected to the wall of the inner cavity.

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

4. The inner 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 two mounting tubes are provided, both of which are connected to one side of the connecting plate, and the two mounting tubes are arranged at intervals along the radial direction of the motor housing; each of the rotors is connected to the outer wall of the mounting tube.

5. The inner rotor motor according to claim 4, characterized in that: An installation position is formed between two adjacent installation tubes and between one of the installation tubes and the side wall of the inner cavity. The fixing frame extends into the two installation positions and is spaced apart from the connecting tube and the installation tube.

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

7. The inner rotor motor according to claim 3, characterized in that: The fixing frame includes at least two fixing tubes, one end of each of the two fixing tubes is connected to the bottom wall of the inner cavity and is spaced apart from the connecting frame; each of the stators is arranged on the inner wall of a fixing tube and is arranged opposite to a rotor.

8. The inner 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.

9. The inner rotor motor according to any one of claims 1 to 8, characterized in that: The inner 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.

Images