Motor and electric fan

Abstract

The utility model discloses a motor and an electric fan, the motor comprises a stator, a control circuit board, an outer rotor and a bearing, the stator comprises a main shaft and a stator iron core, the main shaft comprises a connecting section and a fixing section, and the stator iron core is connected to the periphery of the fixing section; the outer rotor sleeves the periphery of the main shaft and is arranged around the stator iron core; and the bearing is arranged between the connecting section of the main shaft and the outer rotor and is connected with the periphery of the connecting section and the inner wall of the outer rotor, so that the outer rotor rotates relative to the stator. According to the technical scheme, the connection structure of the stator and the outer rotor of the motor is improved, the overall structure of the outer rotor is simplified, and the assembly convenience and practicability of the motor are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor equipment, in particular to a motor and an electric fan. Background Art

[0002] In the related art, an outer rotor motor usually requires bearings to be provided at both ends of the stator main shaft to connect with the outer rotor, so that when the motor rotates the outer rotor relative to the stator under the action of electromagnetic induction, the bearings can be used to ensure the smooth rotation of the outer rotor on the stator main shaft.

[0003] However, the method of setting bearings at both ends of the stator main shaft requires that the outer rotor is respectively connected to the two ends of the stator main shaft by using a front cover and a rear cover that are connected to each other to connect the two bearings. During assembly, it is necessary to adjust the coaxiality of the front cover and the rear cover, and simultaneously install the front cover and the rear cover of the outer rotor, which makes the assembly of the motor more complicated and reduces the assembly convenience and practicality of the motor. Utility Model Content

[0004] The main purpose of the utility model is to provide a motor and an electric fan, aiming to improve the connection structure between the stator and the outer rotor of the motor, simplify the overall structure of the outer rotor, and improve the assembly convenience and practicality of the motor.

[0005] To achieve the above-mentioned purpose, the motor proposed in the utility model includes a stator, a control circuit board, an outer rotor and a bearing, the stator includes a main shaft and a stator core, the main shaft includes a connecting section and a fixed section, the stator core is connected to the outer periphery of the fixed section; the outer rotor is sleeved on the outer periphery of the main shaft and arranged around the stator core; the bearing is arranged between the connecting section of the main shaft and the outer rotor, and connects the outer periphery of the connecting section and the inner wall of the outer rotor, so that the outer rotor rotates relative to the stator.

[0006] Optionally, a wiring through hole is provided in the spindle, and the motor further comprises a control circuit board, the control circuit board is connected to the fixed section of the spindle, and a connecting cable of the control circuit board is passed through the wiring through hole.

[0007] Optionally, an escape opening is provided on the end surface of the fixed section, the escape opening is connected to the wiring through hole, and a connecting cable of the control circuit board is passed through the escape opening and is inserted into the wiring through hole.

[0008] Optionally, the number of the bearing is one, and the bearing is arranged close to the stator core. Alternatively, the bearing includes at least two bearing units, and the at least two bearing units are arranged in sequence and spaced apart along the extension direction of the main shaft, and are respectively connected to the outer wall of the connecting section and the inner wall of the outer rotor.

[0009] Optionally, the outer rotor is provided with a magnetic ring, which is fixedly mounted on the inner wall of the outer rotor and arranged around the stator core. The stator core and the magnetic ring are arranged alternately, and a portion of the structure of the stator core close to the connecting section does not overlap with a projection of the magnetic ring on the main shaft, and a portion of the structure of the magnetic ring away from the connecting section does not overlap with the projection of the stator core on the main shaft.

[0010] Optionally, a first limiting structure is provided on the outer periphery of the connecting section, and a second limiting structure is provided on the inner wall of the outer rotor, wherein the first limiting structure is used to abut and limit the inner ring of the bearing, and the second limiting structure is used to abut and limit the outer ring of the bearing.

[0011] Optionally, the first limiting structure includes a first protrusion and a stop cover, the first protrusion is arranged on the outer periphery of the connecting section; the stop cover is connected to the end surface of the connecting section facing away from the fixed section, at least part of the structure of the stop cover is exposed on the outer peripheral surface of the connecting section, and is arranged at a relative interval with the first protrusion, and the first protrusion and the stop cover are respectively used to abut against opposite sides of the inner ring of the bearing.

[0012] Optionally, the blocking cover includes a cover body and an elastic gasket, the cover body is connected to the end surface of the connecting section, and at least part of the structure is exposed on the outer peripheral surface of the connecting section, the elastic gasket is sleeved on the outer periphery of the connecting section and abuts against the side of the cover body facing the first protrusion, and the elastic gasket abuts against the side wall of the bearing inner ring facing away from the first protrusion. And / or, a wiring through hole is provided in the spindle, the wiring through hole is used for the cable to pass through, and the blocking cover is provided with an avoidance hole, which is connected to the wiring through hole.

[0013] Optionally, the second limiting structure includes a second protrusion, the second protrusion is arranged on the inner wall of the outer rotor, and the second protrusion is used to abut against the side wall of the bearing outer ring.

[0014] Optionally, the second limiting structure also includes a retaining ring, which is connected to the end face of the outer rotor, at least part of the structure of the retaining ring is exposed on the inner wall surface of the outer rotor and is arranged opposite to the second protrusion, and the retaining ring is used to abut the side wall of the bearing outer ring facing away from the second protrusion.

[0015] Optionally, a mounting structure is provided on the outer periphery of the outer rotor, a projection of the mounting structure on the main shaft is located at the connecting section, and the mounting structure is used to connect and install the fan blades.

[0016] The utility model also provides an electric fan, which comprises a motor and fan blades. The motor is the motor described above. The fan blades are connected to the outer rotor of the motor, and the motor drives the fan blades to rotate.

[0017] The technical solution of the utility model is to arrange a bearing at the connecting section of the stator main shaft to connect with the outer rotor, so that the stator iron core is connected and fixed on the fixed section of the main shaft. The length of the connecting section can be arranged to be greater than or equal to the length of the fixed section, so that the bearing is located at the center of gravity of the motor as much as possible, and then the bearing at the connecting section can be used to support the rotation of the outer rotor, so that the bearing is arranged at one end of the main shaft to stably support the connection of the outer rotor, reduce the connection structure between the outer rotor and the fixed section, and then reduce the installation process of the coaxiality adjustment of the outer rotor, realize more convenient production and assembly of the motor, and effectively improve the assembly convenience and practicality of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 This is a structural schematic diagram of an embodiment of the electric fan of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of an embodiment of a motor of the utility model;

[0021] Figure 3 for Figure 2 A schematic structural diagram of a stator in an electric motor according to an embodiment of the present invention;

[0022] Figure 4 for Figure 2 A longitudinal sectional view of an embodiment of a motor;

[0023] Figure 5 for Figure 2 A longitudinal sectional view of another embodiment of a motor;

[0024] Figure 6 A longitudinal sectional view of another embodiment of the motor of the utility model;

[0025] Figure 7 for Figure 6 A cross-sectional exploded view of an embodiment of a motor;

[0026] Figure 8 for Figure 6 A longitudinal sectional view of another embodiment of a motor.

[0027] Description of Figure Numbers:

[0028]

[0029]

[0030] The realization of the purpose, functional features and advantages of the utility model 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 utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

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

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In addition, in the present utility model, descriptions such as "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 defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or 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 utility model.

[0035] In the related art, an outer rotor motor usually needs to be provided with bearings at both ends of the stator main shaft to connect with the outer rotor, so that when the motor rotates the outer rotor relative to the stator under the action of electromagnetic induction, the bearings can be used to ensure the smooth rotation of the outer rotor on the stator main shaft. However, the method of providing bearings at both ends of the stator main shaft requires that the outer rotor be connected to the two ends of the stator main shaft by using a front cover and a rear cover that are connected to each other, and the coaxiality of the front cover and the rear cover need to be adjusted during assembly, and the front cover and the rear cover of the outer rotor need to be installed synchronously, which makes the assembly of the motor more complicated and reduces the assembly convenience and practicality of the motor. In view of the above problems, the utility model proposes a motor 100.

[0036] Reference Figures 1 to 8 In the embodiment of the utility model, the motor 100 includes a stator 10, a control circuit board, an outer rotor 50 and a bearing. The stator 10 includes a main shaft 11 and a stator core 13. The main shaft 11 includes a connecting section 111 and a fixed section 113. The stator core 13 is connected to the outer periphery of the fixed section 113; the outer rotor 50 is sleeved on the outer periphery of the main shaft 11 and is arranged around the stator core 13; the bearing is arranged between the connecting section 111 of the main shaft 11 and the outer rotor 50, and is connected and fixed to the outer periphery of the connecting section 111 and the inner wall of the outer rotor 50, so that the outer rotor 50 rotates relative to the stator 10.

[0037] It can be understood that the motor 100 can be used in equipment such as electric fans 1000, hair dryers, and heat dissipation devices. The motor 100 can be composed of a stator 10 and an outer rotor 50. By connecting and fixing one end of the stator 10 to the housing of the device, and making the outer rotor 50 and the fan blades 200 or other rotating parts, a magnetic field can be generated after the stator core 13 of the stator 10 is energized, and electromagnetic cooperation with magnetic parts such as permanent magnets in the outer rotor 50 can be achieved to realize the rotation of the outer rotor 50 relative to the stator 10, so that the motor 100 can drive the fan blades 200 or other rotating parts to rotate, thereby achieving functions such as blowing or heat dissipation.

[0038] In the present application, by making the main shaft 11 of the stator 10 include two shaft sections, the connecting section 111 and the fixed section 113, the stator core 13 can be sleeved and installed on the fixed section 113. The stator core 13 can be made of a coil or a magnetic material, so that the stator core 13 can generate a certain magnetic field after power is applied or the stator core 13 itself has a certain magnetism. Taking the structure in which the electronic core is a coil as an example, the outer rotor 50 is sleeved on the outer periphery of the main shaft 11, so that the outer rotor 50 can be arranged around the stator core 13. At this time, permanent magnets and other magnetic parts can be arranged in the part of the outer rotor 50 around the stator core 13. The magnetic field generated by powering on the stator core 13 can act on the outer rotor 50, thereby causing the outer rotor 50 to rotate relative to the stator 10. Among them, a certain gap can be maintained between the outer rotor 50 and the stator core 13 and the fixed section 113, so that the fixed section 113 is only inserted in The stator 10 is inserted into the outer rotor 50 but is not connected to the outer rotor 50. At this time, a bearing is arranged between the outer rotor 50 and the connecting section 111, and the inner ring of the bearing is sleeved and fixed on the outer periphery of the connecting section 111, so that the outer ring of the bearing is fixedly arranged on the inner wall of the outer rotor 50. The rotational connection characteristic of the bearing can ensure the rotational connection between the stator 10 and the outer rotor 50, so that the outer rotor 50 can stably rotate relative to the stator 10 on the outer periphery of the stator 10 when affected by the magnetic field of the stator 10, thereby realizing the stable operation of the motor 100.

[0039] Therefore, the main shaft 11 can make the length of the connecting section 111 greater than or equal to the length of the fixed section 113. At this time, by arranging a bearing between the connecting section 111 and the outer rotor 50, the inner ring of the bearing is sleeved and fixed on the outer periphery of the connecting section 111, and the outer ring of the bearing is fixed on the inner ring of the outer rotor 50. Under the effect of the design of the connecting section 111 and the fixed end of the main shaft 11, the center of gravity of the overall structure can be shifted to the connecting section 111. The motor 100 can be provided with a bearing only on the connecting section 111 of the main shaft 11, and the rotation connection between the outer rotor 50 and the stator 10 can be stably achieved, thereby ensuring The bearing provides stable rotation support for the outer rotor 50, thereby realizing the single-side bearing support installation mode of the motor 100, reducing the setting of the connection support structure between the fixed section 113 of the main shaft 11 and the outer rotor 50, so that the outer rotor 50 can be set up with an integral annular structure or sleeve structure, which is conducive to better reducing the coaxiality adjustment process of the outer rotor 50 of the front cover and rear cover combination structure during the production and assembly process, and facilitating the direct routing of the conductive cable of the stator core 13 from the end of the fixed section 113 of the main shaft 11, effectively improving the assembly convenience and assembly efficiency of the motor 100. Among them, the bearing can be set close to the junction of the connecting section 111 and the fixed section 113, and the stator core 13 is set close to the junction of the fixed section 113 and the connecting section 111, so that the overall center of gravity of the motor 100 can overlap with the position of the bearing as much as possible, ensuring the stable support of the bearing for the rotation of the outer rotor 50, and further improving the overall structural stability and reliability of the motor 100.

[0040] The technical solution of the utility model is to arrange a bearing at the connecting section 111 of the main shaft 11 of the stator 10 to connect with the outer rotor 50, so that the stator core 13 is connected and fixed on the fixed section 113 of the main shaft 11. The length of the connecting section 111 can be set to be greater than or equal to the length of the fixed section 113, so that the bearing is located at the center of gravity of the motor 100 as much as possible, and then the bearing at the connecting section 111 can be used to support the rotation of the outer rotor 50, so that the outer rotor 50 can be stably supported and connected by arranging a bearing at one end of the main shaft 11, thereby reducing the connection structure between the outer rotor 50 and the fixed section 113, and then reducing the installation process of adjusting the coaxiality of the outer rotor 50, so that the motor 100 can be produced and assembled more conveniently, and the assembly convenience and practicality of the motor 100 are effectively improved.

[0041] Reference Figure 3 , Figure 4 and Figure 6 In one embodiment of the utility model, a wiring through hole 115 is provided in the spindle 11, and the motor 100 also includes a control circuit board 30, which is connected to the fixed section 113 of the spindle 11, and the connecting cable 31 of the control circuit board 30 is passed through the wiring through hole 115.

[0042] In the related art, the motor 100 can also be integrated with the control circuit board 30 on the main shaft 11. The control circuit board 30 can integrate the drive module, control module and over-current protection module of the motor 100, etc., which can play a certain role in ensuring the normal and stable operation of the motor 100, so as to make the overall structure of the motor 100 more compact and realize the miniaturized design of the motor 100. Usually, a wiring through hole 115 is set in the main shaft 11, and the connecting cable 31 of the control circuit board 30 is passed through the wiring through hole 115 for wiring, which can effectively reduce the interference between the connecting cable 31 of the control circuit board 30 and the outer rotor 50, and ensure the stable operation of the electric fan 1000.

[0043] Among them, a wire hole connected to the wiring through hole 115 can be opened on the part of the structure corresponding to the installation of the control circuit board 30 in the fixed section 113 of the main shaft 11, so that the connecting cable 31 of the control circuit board 30 can pass through the wire hole and enter the wiring through hole 115 for routing.

[0044] By providing a bearing on the connecting section 111 to connect the outer rotor 50 with the support, the assembly method of the connection structure between the outer rotor 50 and the fixed section 113 of the main shaft 11 can be greatly reduced, which is conducive to allowing the connection cable 31 of the control circuit board 30 connected to the fixed section 113 to bypass the end face of the fixed section 113 and penetrate into the wiring through hole 115 of the main shaft 11 for wiring, effectively avoiding interference between the connection cable 31 of the control circuit board 30 and the bearing. Compared with the method of opening a wire hole on the main shaft 11 for threading and routing, the convenience of assembly and routing of the motor 100 can be better improved, the difficulty of assembly of the motor 100 is further reduced, and the assembly convenience and practicality of the motor 100 are further improved.

[0045] Reference Figures 2 to 4 In one embodiment of the utility model, a avoidance opening 1131 is provided on the end surface of the fixed section 113 , and the avoidance opening 1131 is connected to the wiring through hole 115 , and the connecting cable 31 of the control circuit board is passed through the avoidance opening 1131 and is inserted into the wiring through hole 115 .

[0046] In this embodiment, the motor 100 can be assembled with the inner wall of the housing of the electric fan 1000, hair dryer and other equipment by using the end face of the fixed section 113. At this time, the mounting bolts on the equipment housing can be threadedly connected with the threaded holes on the end face of the fixed section 113 to achieve the installation and fixation of the motor 100 in the electric fan 1000 and other equipment. Therefore, by setting the avoidance opening 1131 on the end face of the fixed end, the size of the avoidance opening 1131 can be made larger than the size setting of the connection cable 31 of the control circuit board, and then when the connection cable 31 of the control circuit board bypasses the end face of the fixed section 113 and penetrates the wiring through hole 115, the connection cable 31 can be accommodated in the avoidance opening 1131 to avoid the installation connection between the motor 100 and the equipment, and avoid the connection cable 31 bypassing the end face of the fixed section 113 and protruding on the end face of the fixed section 113, so that the motor 100 can make the end face of the fixed section 113 flatly fit with the equipment housing. In addition, passing the connecting cable 31 through the avoidance opening 1131 in the wiring channel is also beneficial for utilizing the avoidance opening 1131 to realize regular routing of the connecting cable 31 on the periphery of the main shaft 11, thereby facilitating the maintenance and repair of the motor 100, better improving the overall aesthetics of the motor 100, and further improving the practicality and reliability of the motor 100.

[0047] Reference Figure 4 In one embodiment of the utility model, the number of the bearing is one, and the bearing is arranged close to the stator core 13. Alternatively, the bearing includes at least two bearing units 70, which are arranged in sequence along the extension direction of the main shaft 11 and are respectively connected to the outer wall of the connecting section 111 and the inner wall of the outer rotor 50.

[0048] It is understandable that the motor 100 can be provided with one or more bearing units 70 between the connecting section 111 and the outer rotor 50, so that during the production process, a suitable number of bearing units 70 can be selected to support and fix the outer rotor 50 according to the working conditions of the equipment where the motor 100 is installed, thereby ensuring stable and reliable operation of the motor 100.

[0049] In some embodiments, the motor 100 may adopt a structural setting of only one bearing. In this case, the installation position of the bearing on the connecting section 111 of the main shaft 11 may be set as close as possible to the intersection of the connecting section 111 and the fixed section 113, so that the bearing can be installed as close to the center of gravity of the main shaft 11 as possible, thereby better ensuring the connection stability and reliability between the stator 10 and the outer rotor 50.

[0050] In other embodiments, the motor 100 may also adopt the configuration of at least two bearing units 70 to better improve the connection stability and reliability between the stator 10 and the outer rotor 50, and ensure the stable operation of the outer rotor 50. At this time, at least two bearing units 70 may be arranged in sequence along the extension direction of the connecting section 111 on the connecting section 111, and the inner ring of each bearing unit 70 is sleeved and fixed on the outer periphery of the connecting section 111, and the outer ring of each bearing unit 70 is connected and fixed on the inner wall of the outer rotor 50. Under the action of at least two bearing units 70, the contact area between the bearing connecting the stator 10 connecting section 111 and the outer rotor 50 can be better improved, so that the bearing can play a better supporting role on the outer rotor 50, and the jitter of the outer rotor 50 when rotating is better reduced, and the structural stability and reliability of the motor 100 are further improved.

[0051] Reference Figure 5 and Figure 8 In one embodiment of the utility model, the outer rotor 50 is provided with a magnetic ring 57, which is fixedly mounted on the inner wall of the outer rotor 50 and arranged around the stator core 13. The stator core 13 and the magnetic ring 57 are arranged alternately, and the partial structure of the stator core 13 close to the connecting section 111 does not overlap with the projection of the magnetic ring 57 on the main shaft 11, and the partial structure of the magnetic ring 57 far from the connecting section 111 does not overlap with the projection of the stator core 13 on the main shaft 11.

[0052] In this embodiment, during the operation of the motor 100, the rotation of the fan blades connected to the outer rotor 50 causes the outer rotor 50 to be subjected to a force from the connecting section 111 of the main shaft 11 to the fixed section 113 on the fan blades by the wind. At this time, by stator core 13 and magnetic ring 57 of the outer rotor 50 being arranged alternately, a part of the structure of the stator core 13 close to the connecting section 111 on the main shaft 11 can be exposed outside the encirclement of the magnetic ring 57, and a part of the structure of the magnetic ring 57 away from the connecting section 111 of the main shaft 11 can be separated from the stator core. 13, so that the magnetic ring 57 is partially fitted and sleeved with the stator core 13 and part of the structure of the magnetic ring 57 is offset outward, and then the stator core 13 can use the offset between the stator core 13 and the magnetic ring 57 to make the stator core 13 exert a certain force on the magnetic ring 57 from the fixed section 113 of the main shaft 11 to the connecting section 111, so that the load force on the outer rotor 50 during the rotation process can be well offset, preventing the outer rotor 50 from separating from the stator 10, ensuring the stable operation of the motor 100, and further improving the overall structural stability and reliability of the motor 100.

[0053] Reference Figures 4 to 8In one embodiment of the utility model, a first limiting structure is provided on the outer periphery of the connecting section 111, and a second limiting structure is provided on the inner wall of the outer rotor 50. The first limiting structure is used to abut against and limit the inner ring of the bearing, and the second limiting structure is used to abut against and limit the outer ring of the bearing.

[0054] It is understandable that the bearing can be provided with a rotating structure such as a ball between the inner ring and the outer ring, so that the bearing can respectively connect the main shaft 11 and the outer rotor 50 by using the inner ring and the outer ring, so that the outer rotor 50 can stably rotate on the main shaft 11 under the rotation support of the rotating structure. Among them, the inner ring size of the rotating shaft can be set corresponding to the diameter size of the connecting section 111 of the main shaft 11, so that the bearing can be sleeved on the connecting section 111 by using the inner ring, and have an interference fit with the outer periphery of the connecting section 111, so that the inner ring can be installed and fixed on the connecting section 111. The outer ring size of the rotating shaft can be set corresponding to the inner hole diameter of the outer rotor 50, so that the outer rotor 50 can be sleeved on the outer periphery of the bearing outer ring, and the inner wall of the outer rotor 50 can have an interference fit with the outer ring of the bearing, so that the outer ring of the bearing can be installed and fixed in the inner hole of the outer rotor 50. In addition, the interference fit between the bearing and the connecting section 111 of the main shaft 11 and the outer rotor 50 can be used to install and fix the bearing, thereby ensuring the stable operation of the motor 100.

[0055] In this embodiment, a first limiting structure is provided on the outer periphery of the connecting section 111, and a second limiting structure is provided on the inner wall of the outer rotor 50. The first limiting structure and the second limiting structure may be structures such as blocking bosses, clips or snaps. The first limiting structure may be used to abut against the inner ring of the fixed bearing on the outer periphery of the connecting section 111 to block and limit the relative movement of the inner ring of the bearing on the connecting section 111 along the central axis of the main shaft 11, thereby realizing the limiting and fixing effect of the first limiting structure on the bearing. At the same time, the second limiting structure may be used to abut against the outer ring of the fixed bearing on the inner wall of the outer rotor 50 to block and limit the relative movement of the outer ring of the bearing in the outer rotor 50 along the central axis of the main shaft 11, thereby realizing the limiting and fixing effect of the second limiting structure on the bearing. Therefore, by setting the first limiting structure and the second limiting structure, the bearing can be firmly fixed between the main shaft 11 and the outer rotor 50, preventing the bearing from moving relative to the main shaft 11 or the outer rotor 50 during the operation of the motor 100, thereby ensuring the stable operation of the motor 100 and further improving the structural stability and reliability of the motor 100.

[0056] Among them, when the bearing is provided with multiple bearing units 70 to increase the supporting stability of the bearing on the outer rotor 50, the first limiting structure and the second limiting structure can respectively abut and limit each bearing unit 70, and the partial structures of the first limiting structure and the second limiting structure can also be used to be arranged between adjacent bearing units 70, so that the first limiting structure and the second limiting structure can play a certain role in separating the bearing units 70, ensuring the spaced arrangement of the multiple bearing units 70 on the outer periphery of the connecting section 111, ensuring the stable supporting effect of the bearing on the outer rotor 50, and further improving the structural stability and reliability of the motor 100.

[0057] Reference Figures 4 to 8 In one embodiment of the utility model, the first limiting structure includes a first protrusion 1111 and a blocking cover 1113, the first protrusion 1111 is arranged on the outer periphery of the connecting section 111; the blocking cover 1113 is connected to the end surface of the connecting section 111 facing away from the fixed section 113, at least part of the structure of the blocking cover 1113 is exposed on the outer peripheral surface of the connecting section 111, and is arranged relatively spaced from the first protrusion 1111, and the first protrusion 1111 and the blocking cover 1113 are respectively used to abut against the opposite sides of the inner ring of the bearing.

[0058] In this embodiment, the first limiting structure may include a first protrusion 1111 protrudingly arranged on the outer periphery of the connecting section 111 and a blocking cover 1113 detachably connected to the end face of the connecting section 111. The first protrusion 1111 may be a protrusion structure formed by integral casting with the main shaft 11, or may be a convex block structure bonded or screwed to the outer periphery of the connecting section 111, and the blocking cover 1113 may be fixedly connected to the end face of the connecting section 111 by bolts or buckles. The diameter of the blocking cover 1113 may be set larger than the diameter of the end face of the connecting section 111. After the blocking cover 1113 is installed on the end face of the connecting section 111, a part of the structure of the blocking cover 1113 may be exposed on the outer periphery of the connecting section 111, and the blocking cover 1113 may be fixedly connected to the end face of the connecting section 111 by bolts or buckles. The portion of the structure of the cover 1113 exposed on the outer periphery of the connecting section 111 is spaced apart from the first protrusion 1111, so that the bearing can be arranged between the stop cover 1113 and the first protrusion 1111. Furthermore, during the operation of the motor 100, if the bearing has a tendency to move relative to the main shaft 11, the first protrusion 1111 can be used to abut against one side of the bearing to prevent the bearing from moving toward the first protrusion 1111, and the stop cover 1113 can be used to abut against the other side of the bearing to prevent the bearing from moving toward the stop cover 1113, thereby realizing the limiting and fixing effect of the first limiting structure on the bearing, preventing the bearing from separating from the main shaft 11 during the operation of the motor 100, and ensuring the stability and reliability of the connection between the main shaft 11 and the bearing.

[0059] Among them, by making the baffle cover 1113 detachably connected to the end face of the connecting section 111, during the assembly process, the baffle cover 1113 can be first detached from the connecting section 111, and then the bearing can be sleeved onto the connecting section 111 from the end face of the connecting section 111, so that the inner ring of the bearing and the outer periphery of the connecting section 111 are interference fit to achieve the connection and fixation of the bearing and the connecting section 111, and then the baffle cover 1113 is connected and fixed to the end face of the connecting section 111, so that the baffle cover 1113 and the first protrusion 1111 are respectively located on opposite sides of the inner ring of the bearing to limit and fix the bearing, thereby realizing convenient assembly of the bearing and the main shaft 11, and further improving the assembly convenience and structural reliability of the motor 100.

[0060] In addition, when the bearing includes at least two bearing units 70, the first limiting structure may further include a separation ring, which can be used to be sleeved between adjacent bearing units 70 to achieve the spaced arrangement of multiple bearing units 70. The separation ring can be disassembled and sleeved on the connecting section 111 of the main shaft 11, so that during the assembly process, the bearing unit 70 and the separation ring can be sequentially sleeved and installed on the connecting section 111. At this time, the first protrusion 1111 and the baffle cover 1113 can respectively abut against two opposite side walls of the two opposite bearing units 70, thereby ensuring that the first protrusion 1111 and the baffle cover 1113 limit and fix the overall bearing, thereby further improving the connection stability and reliability between the main shaft 11 and the bearing.

[0061] Reference Figure 4 The blocking cover 1113 includes a cover body and an elastic washer 1115, wherein the cover body is connected to the end surface of the connecting section 111, and at least a part of the structure is exposed on the outer peripheral surface of the connecting section 111, and the elastic washer 1115 is sleeved on the outer periphery of the connecting section 111 and abuts against the side of the cover body facing the first protrusion 1111, and the elastic washer 1115 abuts against the side wall of the bearing inner ring facing away from the first protrusion 1111. And / or, the blocking cover 1113 is provided with an avoidance hole, and the avoidance hole is communicated with the wiring through hole 115.

[0062] In this embodiment, the blocking cover 1113 may include a cover body and an elastic washer 1115. By arranging the elastic washer 1115 on the side of the cover body opposite to the first protrusion 1111, the elastic washer 1115 can be used to abut against the side wall of the bearing inner ring facing away from the first protrusion 1111 during the assembly process, and then the elasticity of the elastic washer 1115 can be used to apply a certain preload force to the bearing, so that the first limiting structure can better abut against the limiting fixed bearing, thereby further improving the connection stability and reliability of the bearing and the main shaft 11.

[0063] In addition, by setting an avoidance hole on the blocking cover 1113 and connecting the avoidance hole with the wiring through hole 115, when the control panel of the motor 100 is set on the side close to the connecting section 111 of the main shaft 11, the connecting cable 31 of the control circuit board 30 can stably pass through the wiring through hole 115 and the avoidance hole to be connected to the control panel, thereby realizing convenient and reliable wiring of the motor 100, reducing interference between the wiring of the motor 100 and other components, and further improving the structural stability and reliability of the motor 100.

[0064] Reference Figures 4 to 8 In one embodiment of the present invention, the second limiting structure includes a second protrusion 51, and the second protrusion 51 is provided on the inner wall of the outer rotor 50, and the second protrusion 51 is used to abut against the side wall of the bearing outer ring.

[0065] In this embodiment, the second limiting structure may include a second protrusion 51, which may be a boss structure integrally cast on the inner wall of the outer rotor 50, or may be a circular ring structure bonded or screwed to the inner wall of the outer rotor 50, so that after the outer ring of the bearing and the inner wall of the outer rotor 50 are interference fit to achieve the connection and fixation of the bearing and the outer rotor 50, the second protrusion 51 can be located on the side of the outer ring of the bearing facing away from the end face of the outer rotor 50, and then the second protrusion 51 can be used to abut against one side of the outer ring of the bearing to block the bearing from moving toward the second protrusion 51, thereby achieving the limiting fixation of the bearing on the outer rotor 50 by the second limiting structure, preventing the bearing from moving relative to the outer rotor 50 during the operation of the motor 100, which may cause the bearing to detach from the outer rotor 50 with a certain probability, further improving the connection stability and reliability between the bearing and the outer rotor 50, and ensuring the stable operation of the motor 100.

[0066] Among them, when the bearing includes two bearing units 70, the second protrusion 51 can also be located between the two bearing units 70, so that the opposite sides of the second protrusion 51 can respectively abut the relative side walls of the two adjacent bearing units 70, which is conducive to using the second protrusion 51 to limit and fix the two adjacent bearing units 70 at the same time. The second protrusion 51 can also be used to separate the two adjacent bearing units 70 to achieve the spaced arrangement of the bearing units 70, thereby ensuring the stable supporting effect of the bearing on the outer rotor 50, and further improving the connection stability and reliability of the bearing and the outer rotor 50.

[0067] Reference Figures 6 to 8 In one embodiment of the utility model, the second limiting structure also includes a retaining ring 53, which is connected to the end face of the outer rotor 50, at least part of the structure of the retaining ring 53 is exposed on the inner wall surface of the outer rotor 50, and is arranged opposite to the second protrusion 51, and the retaining ring 53 is used to abut the side wall of the bearing outer ring facing away from the second protrusion 51.

[0068] In this embodiment, the second limiting structure also includes a retaining ring 53, which can be detachably connected to the end face of the outer rotor 50 by fasteners such as bolts or clips. The inner diameter of the retaining ring 53 can be smaller than the inner hole diameter of the outer rotor 50, and the outer diameter of the retaining ring 53 can be larger than the inner hole diameter of the outer rotor 50. After the retaining ring 53 is installed on the end face of the outer rotor 50, part of the structure of the retaining ring 53 can be exposed on the inner wall surface of the outer rotor 50 and spaced apart from the second protrusion 51. Therefore, when the bearing is installed on the outer rotor 50, the retaining ring 53 can be removed from the outer rotor 50 first, and then the bearing can be inserted into the inner hole of the outer rotor 50, so that the outer ring of the bearing and the inner wall of the outer rotor 50 are interference fit and fixed, and then the retaining ring 53 is installed and fixed on the end face of the outer rotor 50, so that the retaining ring 53 and the second protrusion 51 are respectively located on opposite sides of the outer ring of the bearing, thereby realizing the limiting and fixing effect of the second limiting structure on the outer ring of the bearing, effectively preventing the bearing and the outer rotor 50 from moving relative to each other, and further improving the overall structural stability and reliability of the motor 100.

[0069] Reference Figure 2 , Figure 4 and Figure 6 In one embodiment of the utility model, a mounting structure 55 is provided on the outer periphery of the outer rotor 50 , and the projection of the mounting structure 55 on the main shaft 11 is located at the connecting section 111 . The mounting structure 55 is used to connect and install the fan blades 200 .

[0070] In this embodiment, the motor 100 can sleeve and install the blades 200 on the outer periphery of the outer rotor 50, so that the outer rotor 50 drives the blades 200 to rotate, ensuring the stable operation of the electric fan 1000, the hair dryer and other equipment. Among them, the mounting structure 55 can be a buckle structure that is engaged with the blades 200, or can be an external thread that cooperates with the internal thread of the blades 200, so as to realize convenient assembly between the blades 200 and the motor 100. By making the projection of the mounting structure 55 on the main shaft 11 located on the connecting section 111, the installation nodes of the blades 200 and the motor 100 can be located in the same vertical plane as the bearing, so that the bearing can better support the rotation of the outer rotor 50, realize the stable and reliable operation of the motor 100, and further improve the structural stability and reliability of the motor 100.

[0071] The utility model also proposes an electric fan 1000, which includes a motor 100 and fan blades 200. The specific structure of the motor 100 refers to the above-mentioned embodiment. Since the electric fan 1000 adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0072] The above description is only a preferred 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 inventive 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. A motor, characterized in that: include: A stator, the stator comprising a main shaft and a stator core, the main shaft comprising a connecting section and a fixed section, the stator core being connected to the outer periphery of the fixed section; An outer rotor, which is sleeved on the outer circumference of the main shaft and arranged around the stator core; A bearing is provided between the connecting section of the main shaft and the outer rotor, and connects the outer periphery of the connecting section and the inner wall of the outer rotor so that the outer rotor rotates relative to the stator.

2. The motor according to claim 1, characterized in that A wiring through hole is provided in the spindle, and the motor further comprises a control circuit board, which is connected to the fixed section of the spindle, and a connecting cable of the control circuit board is passed through the wiring through hole.

3. The motor according to claim 2, characterized in that The end surface of the fixed section is provided with an escape opening, the escape opening is connected to the wiring through hole, and the connecting cable of the control circuit board is passed through the escape opening and is inserted into the wiring through hole.

4. The motor according to claim 1, characterized in that The number of the bearing is one, and the bearing is arranged close to the stator core; Alternatively, the bearing comprises at least two bearing units, and the at least two bearing units are sequentially arranged at intervals along the extension direction of the main shaft and are respectively connected to the outer wall of the connecting section and the inner wall of the outer rotor.

5. The motor according to any one of claims 1 to 4, characterized in that: The outer rotor is provided with a magnetic ring, which is fixedly mounted on the inner wall of the outer rotor and arranged around the stator core; The stator core and the magnetic ring are arranged alternately, the partial structure of the stator core close to the connecting section does not overlap with the projection of the magnetic ring on the main axis, and the partial structure of the magnetic ring away from the connecting section does not overlap with the projection of the stator core on the main axis.

6. The motor according to any one of claims 1 to 4, characterized in that: A first limiting structure is provided on the outer periphery of the connecting section, and a second limiting structure is provided on the inner wall of the outer rotor. The first limiting structure is used to abut against and limit the inner ring of the bearing, and the second limiting structure is used to abut against and limit the outer ring of the bearing.

7. The motor according to claim 6, characterized in that The first limiting structure comprises: a first protrusion, wherein the first protrusion is arranged on the outer periphery of the connecting section; A stop cover is connected to the end face of the connecting section facing away from the fixed section, at least part of the structure of the stop cover is exposed on the outer peripheral surface of the connecting section, and is arranged relatively spaced from the first protrusion, and the first protrusion and the stop cover are respectively used to abut against opposite sides of the bearing inner ring.

8. The motor according to claim 7, characterized in that The blocking cover comprises a cover body and an elastic washer, wherein the cover body is connected to the end surface of the connecting section, and at least a part of the structure is exposed on the outer peripheral surface of the connecting section, the elastic washer is sleeved on the outer periphery of the connecting section and abuts against a side of the cover body facing the first protrusion, and the elastic washer abuts against a side wall of the bearing inner ring facing away from the first protrusion; And / or, a wiring through hole is provided in the main shaft, the wiring through hole is used for passing the cable, and the blocking cover is provided with an avoidance hole, and the avoidance hole is communicated with the wiring through hole.

9. The motor according to claim 7, characterized in that The second limiting structure includes a second protrusion, which is arranged on the inner wall of the outer rotor, and the second protrusion is used to abut against the side wall of the bearing outer ring.

10. The motor according to claim 9, characterized in that The second limiting structure also includes a retaining ring, which is connected to the end face of the outer rotor, at least part of the structure of the retaining ring is exposed on the inner wall surface of the outer rotor and is arranged opposite to the second protrusion, and the retaining ring is used to abut the side wall of the bearing outer ring facing away from the second protrusion.

11. The motor according to any one of claims 1 to 4, characterized in that A mounting structure is provided on the outer periphery of the outer rotor, the projection of the mounting structure on the main shaft is located at the connecting section, and the mounting structure is used for connecting and mounting the fan blades.

12. An electric fan, characterized in that: The electric fan comprises a motor and fan blades, the motor is the motor described in any one of claims 1 to 11, the fan blades are connected to the outer rotor of the motor, and the motor drives the fan blades to rotate.

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