An outer rotor motor structure

Abstract

The application relates to an outer rotor motor structure which comprises a base, a shaft core assembly, a stator core assembly, a rotor magnetic ring and a shell; the shaft core assembly at least comprises an equal-diameter light shaft, an upper bearing, a lower bearing and a lower bearing support; the top end of the equal-diameter light shaft passes through the upper bearing chamber in the center of the inner fixed end of the shell; the upper bearing is located in the upper bearing chamber; the lower bearing support comprises a lower bearing chamber and a support fixed part, the lower bearing is located in the lower bearing chamber, the bottom end of the equal-diameter light shaft is connected with the shaft core connecting part in the center of the base through the lower bearing chamber; the support fixed part is fixedly connected with the free end of the shell; the stator core assembly is sleeved outside the equal-diameter light shaft between the upper bearing and the lower bearing, and the two ends of the stator core assembly are respectively abutted with the inner rings of the bearings through an axle sleeve. The application can effectively improve the stability of motor operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to an outer rotor electric machine structure. BACKGROUND

[0002] Electric machines are important devices in transmission systems and control systems. With the increasing demand for accurate position and angle control in modern applications, the application of control electric machines is also becoming more and more widespread. For example, in the application of laser radar systems in robots and cars, the laser pulses emitted by the laser emitter irradiate the reflecting mirror, and the electric machine drives the reflecting mirror to rotate to achieve accurate scanning. For another example, the galvanometer used in laser marking machines and laser engraving machines is also a control electric machine. A restoring torque is added to the rotor of the galvanometer through mechanical torsional springs or electronic methods, and the size is proportional to the angle of the rotor deviating from the balance position. When the coil is passed through a certain current and the rotor is deflected to a certain angle, the electromagnetic torque and the restoring torque are equal in size, and the rotor stops rotating. Therefore, the galvanometer is also called a swing electric machine. Sensors are installed on the electric machine to sense the deflection position or angle of the electric machine and convert it into an electrical signal to send to the control system. From the above application fields of control electric machines, it can be seen that the stability of the electric machine rotation is the key to achieving accurate position and angle control.

[0003] Most of the control electric machines in the above-mentioned various applications are outer rotor electric machines, i.e. the main shaft of the electric machine is fixed with the machine base, the internal core winding and the main shaft are the stator, and the shell and the permanent magnet are the rotor, which rotates with the shell. Most of the outer rotor electric machines used for position, angle, and speed control adopt stepped shafts, i.e. the electric machine shaft has multiple structures with different radii in the cross section, among which the small radius thin step is used to cooperate with the bearing, and the large radius thick step is used to cooperate with the shell, so as to realize the rotation of the shell while the electric machine shaft is fixed during the operation of the electric machine. For some electric machines with small volume and height, such as the scheme disclosed in the Chinese patent with the publication number CN 216343482U and the invention name "Integrated bearing of laser radar electric machine, laser radar electric machine, and laser radar", the electric machine shaft is a stepped shaft, and two parallel bearings are used at one end of the electric machine shaft. A rotor magnetic ring and a stator core are arranged between the bearings and the base. Therefore, for the structure of installing bearings at one end of the electric machine shaft, the overall weight of the electric machine (such as the weight of the permanent magnet as the rotor, the stator core, and the winding) is concentrated at one end, and the weight distribution is uneven. Such uneven weight distribution structure is prone to cause shaking problems during the operation of the electric machine. When the ratio of the height to the width of the electric machine increases, the stress on the bearings located at one end of the electric machine shaft will increase during the operation of the electric machine, which not only affects the service life of the bearings and the electric machine shaft, but also causes shaking during the rotation of the electric machine. In addition, when the stepped shaft is not machined to good concentricity, it will also cause shaking during the rotation of the electric machine. SUMMARY

[0004] In view of the technical problems existing in the prior art, the application provides an outer rotor motor structure to improve the stability of motor operation.

[0005] In order to solve the above technical problems, the application provides an outer rotor motor structure, which comprises a base, a shaft core assembly, a stator core assembly, a rotor magnetic ring and a shell; a shaft core connecting portion is arranged at the center of the base; an upper bearing chamber is arranged at the center of the inner part of the fixed end of the shell, and a rotor limiting block extending into the shell is arranged at the edge of the inner part of the fixed end of the shell; the other end of the shell is a free end; the shaft core assembly comprises an equal-diameter optical shaft, an upper bearing, a lower bearing and a lower bearing support; the top end of the equal-diameter optical shaft passes through the upper bearing chamber at the center of the inner part of the fixed end of the shell; the upper bearing is located in the upper bearing chamber, the outer ring of the upper bearing is connected with the inner wall of the upper bearing chamber, and the inner ring of the upper bearing is connected with the equal-diameter optical shaft; the lower bearing support comprises a lower bearing chamber and a support fixed portion, the lower bearing is located in the lower bearing chamber, the inner ring of the lower bearing is connected with the equal-diameter optical shaft, the outer ring of the lower bearing is connected with the inner wall of the lower bearing chamber, and the bottom end of the equal-diameter optical shaft is connected with the shaft core connecting portion at the center of the base through the lower bearing chamber; the support fixed portion is fixedly connected with the free end of the shell; the stator core assembly is sleeved outside the equal-diameter optical shaft between the upper bearing and the lower bearing, and the two ends of the stator core assembly are abutted with the inner rings of the bearings through the shaft sleeves; the rotor magnetic ring is sleeved outside the stator core assembly, one end of the rotor magnetic ring is limited by the rotor limiting block, and the other end of the rotor magnetic ring is limited by the support fixed portion.

[0006] Preferably, the stator core assembly comprises a core and a sleeve thereof; a plurality of first through grooves or first convex edges are arranged on the inner side wall of the core along the axial direction, and a plurality of second convex edges or second through grooves are arranged on the outer side wall of the sleeve along the axial direction; when the core is sleeved on the sleeve, the first through grooves or the first convex edges are matched with the second convex edges or the second through grooves; a plurality of third through grooves are arranged on the inner side wall of the sleeve along the axial direction, and the third through grooves are used for adding adhesive; when the sleeve is sleeved on the equal-diameter optical shaft, the plurality of third through grooves with the added adhesive are used for fixing the sleeve and the equal-diameter optical shaft together.

[0007] Preferably, the first through grooves or the first convex edges are transitionally matched with the second convex edges or the second through grooves, adhesive is added in the first through grooves or the second through grooves during installation, and the core and the sleeve are fixed together; the sleeve and the equal-diameter optical shaft are transitionally matched.

[0008] Preferably, the shaft sleeve comprises a first end and a second end, wherein the end face diameter of the shaft sleeve first end is greater than the end face diameter of the shaft sleeve second end, the end face width of the shaft sleeve second end is adapted to the width of the bearing inner ring; the end face of the shaft sleeve first end abuts against the core sleeve end face, and the end face of the shaft sleeve second end abuts against the bearing inner ring.

[0009] Preferably, the shaft core connecting portion is a mounting table raised above the base plane, and the mounting table is provided with a mounting hole in interference fit with the bottom end of the equal-diameter optical shaft.

[0010] Preferably, a plurality of adjusting grooves are provided on the mounting table along the circumferential direction of the mounting hole, for adjusting the interference fit between the bottom end of the equal-diameter optical shaft and the mounting hole.

[0011] Preferably, the height of the mounting hole in interference fit with the bottom end of the equal-diameter optical shaft is 3-8 mm.

[0012] Preferably, the outer surface of the base is treated by a light extinction process.

[0013] Preferably, the rotor limiting block is a convex ring or a convex block distributed at intervals along the edge circumference of the inner portion of the fixed end of the shell.

[0014] The equal-diameter optical shaft is used as support in the present application, thus eliminating the shaking problem caused by poor concentricity of the stepped shaft. The present application uses two bearings distributed at the upper and lower ends of the motor shaft, and sets the stator core between the two bearings, so that the overall weight is evenly distributed, thereby reducing the shaking problem caused by uneven weight distribution during rotation. When the motor is running, force points are formed at the bearings at the upper and lower ends of the motor shaft. Compared with the single-end bearing installation mode, the force arm formed between the two bearings is larger, so that the bearing is subjected to smaller force when subjected to the same centrifugal force. Therefore, the motor runs more smoothly, and the service life of the bearing is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Hereinafter, preferred embodiments of the present application will be further described in detail with reference to the accompanying drawings, in which:

[0016] Figures 1A-1B Fig. 1 is a schematic diagram of a motor structure according to an embodiment of the present application;

[0017] Figure 2 Fig. 2 is an exploded schematic diagram of a motor structure according to an embodiment of the present application;

[0018] Figure 3 Fig. 3 is an axial sectional view of a motor structure according to an embodiment of the present application;

[0019] Figures 4A-4Bare schematic diagrams of a base structure according to an embodiment of the present application, respectively;

[0020] Figure 5 is a schematic diagram of an axial cross-section of a housing according to an embodiment of the present application;

[0021] Figure 6 is a schematic diagram of a lower bearing support according to an embodiment of the present application;

[0022] Figure 7 is a schematic diagram of a core cross-section according to an embodiment of the present application; and

[0023] Figure 8 is a schematic diagram of a core sleeve cross-section according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0025] In the following detailed description, reference will be made to the accompanying drawings, which form a part of this description, illustrating certain embodiments of the present application. In the drawings, like numerals describe similar components throughout the several views of the drawings. Embodiments of the present application will be described in sufficient detail to enable those skilled in the art to make and use it, and is not intended to limit the scope of the application, as it is to be construed that modifications in form and detail can be made hereto by those skilled in the art without departing from the spirit, scope, and characteristics of this application. Embodiments of the present application can also be utilized in other embodiments or with structural, logical, and electrical changes.

[0026] Figures 1A-1B are schematic diagrams of a motor structure according to an embodiment of the present application, respectively, Figure 2 is an exploded schematic diagram of a motor structure according to an embodiment of the present application, Figure 3 is an axial cross-sectional perspective view of a motor structure according to an embodiment of the present application. The motor structure in the embodiment includes a base 1, a shaft core assembly 2, a stator core assembly 3, a rotor magnetic ring 4, and a housing 5. The base 1 is provided with a mounting table 11 protruding from a plane of the base body 10 at the center, which is a shaft core connecting portion. The shaft core assembly 2 includes at least a constant-diameter optical shaft 21, an upper bearing 22, a lower bearing 23, and a lower bearing support 24. The stator core assembly 3 includes a core 31 and a core sleeve 32. The stator core assembly 3, the rotor magnetic ring 4, and the housing 5 are sequentially sleeved from inside to outside with the shaft core assembly 2 as the center.

[0027] Referring to FIG. 2 and combining with Figure 3 、 Figure 4A and Figure 4B , Figure 4A and Figure 4B are respectively schematic diagrams of a base structure according to an embodiment of the present application. In the embodiment, a mounting table 11 is arranged in the center of the base 1 and protrudes from the plane of the base body 10, which is a shaft core connecting part. The mounting table 11 is provided with a mounting hole 12 that is in interference fit with the bottom end of the equal-diameter optical shaft 21, and a plurality of adjusting grooves 13 are arranged on the mounting table 11 along the circumferential direction of the mounting hole 12, which are used to adjust the interference fit between the bottom end of the equal-diameter optical shaft and the mounting hole. Among them, the height of the mounting table 11 is 3-8mm, and in an embodiment, based on the overall length of the equal-diameter optical shaft 21, the height of the mounting table 11 is 5mm.

[0028] Among them, when the motor is applied to a laser radar system, a plurality of reflecting lenses need to be mounted on the shell 5. In order to reduce the interference of the outer surface of the base on the reflecting lenses, the outer surface of the base 1 is treated by light extinction process, so as to reduce the interference of the base on the reflected light when the reflecting lenses are mounted on the motor shell.

[0029] Since the motor circuit board 6 needs to be fixed on the base 1, and the circuit board 6 needs to be connected with the stator core winding (not shown in FIG. 1), in order to facilitate the welding of the outgoing wires of the winding to the circuit board 6, a hole is arranged on the base 1, such as the lead hole 14 arranged beside the mounting table 11 in Figure 4A and Figure 4B , and a hole is also arranged on the corresponding position of the circuit board 6. The front surface of the circuit board 6 is welded with components, and the core winding connection points are arranged on the back surface of the circuit board 6. When the front surface of the circuit board 6 is fixed upward on the base 1 body, the core winding connection points are exposed downward to the lead hole 14. When welding, the outgoing wires of the winding pass through the hole on the circuit board 6 and the lead hole 14 on the base 1, and are welded on the back surface of the circuit board 6.

[0030] According to the application scene, mounting structures are arranged on the base 1, such as the two connecting structures 15, 16 shown in Figure 4A and Figure 4B , which are provided with mounting holes for connecting with other structures in the application scene. It should be noted that the shapes of the connecting structures 15, 16 and their positions in the base 1 are matched with the requirements of the application scene, and thus are not limited to the positions and shapes shown in the figures. Figure 4A Figure 4B

[0031] ​​The equal-diameter light shaft 21 is an equal-diameter cylinder, compared with the stepped shaft, the cylindricality and concentricity of the shaft are easier to be kept during machining, the machining difficulty is low, and thus the equal-diameter light shaft 21 is concentric in up and down directions and runs smoothly. In order to facilitate the connection with bearings, a base and the like, the transition position between the end face and the side face of the two ends of the equal-diameter light shaft 21 is a round corner structure, and in an embodiment, the two ends of the equal-diameter light shaft 21 are processed with a 0.2 inverted round corner.

[0032] In order to ensure that the equal-diameter light shaft 21 has sufficient strength, so as to prevent the subsequent shaking of the rotating part caused by the material problem of the shaft core of the motor and the like, the equal-diameter light shaft 21 is subjected to quenching and tempering treatment as a whole, so that the hardness is HRC 25-42, and preferably the hardness is HRC 30-36. Further, since the matching position of the shaft and the bearing is the main stress surface, the matching position of the equal-diameter light shaft 21 and the upper bearing 22 and the lower bearing 23 is subjected to high-frequency quenching treatment, so that the hardness is HRC 50-65, and preferably the hardness is HRC 55-62, which not only saves the cost, but also improves the strength of the shaft.

[0033] Referring to Figure 3 , the bearing Figure 5 , Figure 5 is a shell axial cross-sectional perspective view according to an embodiment of the present application. The shell 5 is a whole integrated structure, which is a two-segment hollow cylinder with different radii, the radius of the first cylinder 51 is smaller than that of the second cylinder 52, the top end of the first cylinder 51 is the fixed end of the whole shell body, the end of the first cylinder 51 is integrally connected with the second cylinder 52, the second cylinder 52 is adjacent to the base 1, and the second cylinder 52 is the free end of the whole shell body. In order to facilitate the installation of other components at the top end of the first cylinder 51 in some application occasions, the top end has a certain thickness in the embodiment to ensure the supporting strength of the top end. In an embodiment, the thickness of the top end is about 1-2 mm, and mounting holes, positioning holes and the like are reserved.

[0034] The first cylinder 51 has an upper bearing chamber 53 in the center of the top end. The upper bearing chamber 53 is a hollow cylinder protruding into the housing, with an inner diameter matching the outer diameter of the outer ring of the upper bearing 22, so that the outer ring of the upper bearing 22 fits snugly with the inner wall of the upper bearing chamber 53. Thus, when installing, the upper bearing 22 can be smoothly inserted into the upper bearing chamber 53, avoiding damage to the internal structure of the bearing caused by stress on the outer ring of the upper bearing 22. In order to avoid the phenomenon of the bearing running out of the outer ring after the motor has been running for a long time, when installing the upper bearing 22 into the upper bearing chamber 53, an adhesive is added between the surface of the outer ring of the upper bearing 22 and the inner wall of the upper bearing chamber 53 to fix the outer ring of the upper bearing 22 with the upper bearing chamber 53. In a better embodiment, in order to prevent the bottom angle of the upper bearing chamber 53 from being out of position during processing, causing stress on the outer ring of the bearing, a gasket 251, such as a red steel wire with a thickness of 0.25-0.3 mm, is added between the end surface of the upper bearing 22 and the bottom of the upper bearing chamber 53.

[0035] The edge of the top end of the first cylinder 51 has a rotor limiting block 54 protruding into the housing, as shown in Figure 3 , which is a protrusion for abutting against the upper end surface of the rotor magnetic ring 3. Of course, it can also be other structures, such as multiple protrusions arranged along the circumference at intervals.

[0036] As shown in Figure 3 , the rotor limiting block 54 is matched with Figure 6 , Figure 6Is according to an embodiment of the utility model lower bearing support's three-dimensional structure schematic diagram. The lower bearing support 24 includes lower bearing chamber 241 and support fixed part 242. The lower bearing chamber 241 includes circular side wall and bottom, bottom has the through hole with diameter greater than the diameter of the equal diameter optical axis 21, to make the equal diameter optical axis 21 can pass through the lower bearing chamber 241. The lower bearing 23 is located in the lower bearing chamber 241, lower bearing 23 inner ring with the equal diameter optical axis 21 cooperation, lower bearing 23 outer ring with lower bearing chamber 241 inner wall cooperation. Wherein, the equal diameter optical axis 21 with upper bearing 22 and lower bearing 23's inner ring are all transition fit, lower bearing 23 outer ring and lower bearing chamber 241 inner wall are transition fit, when installing lower bearing 23 into lower bearing chamber 241, between lower bearing 23 outer ring surface and lower bearing chamber 241 inner wall add adhesive to with lower bearing 23's outer ring and lower bearing chamber 241 are fixed. With upper bearing chamber 53 similar, to prevent the lower bearing chamber 241 bottom in processing, the bottom angle processing is not in place and appears bearing outer ring stress condition, between lower bearing 23 end face and lower bearing chamber 241 bottom increase gasket 252. The support fixed part 242 is circular ring structure, lower bearing chamber 241 circular side wall with the circular ring structure 242 between connection has multiple connecting rods 243, the circular ring structure and lower bearing chamber 241 are concentric structure. In an embodiment, the connecting rod 243 is connected between the circular side wall of the lower bearing chamber 241 and the circular ring structure 242 along the radial direction. In another embodiment, the connecting rod 243 has three, the included angle between them is 120 degrees, providing more stable support in a triangular support manner, and because there are only three, it will not interfere with the stator core winding. The outer diameter of the support fixed part 242 is adapted to the inner diameter of the motor housing 5. Furthermore, a groove 244 is formed on the outer side wall of the circular ring structure, and an adhesive is added into the groove 244 to fix the lower bearing support 24 and the first cylinder 51 end of the housing 5 together.

[0037] Referring again to Figure 3 , the upper end of the equal diameter optical axis 21 passes through the top end of the first cylinder 51 of the housing 5, and the inner ring of the upper bearing 22 cooperates with the upper bearing chamber 53 at the top end, thereby supporting the housing 5. The lower end of the equal diameter optical axis 21 passes through the lower bearing chamber 241 in the center of the lower bearing support 24 fixed together with the end of the first cylinder 51, and cooperates with the inner ring of the lower bearing 23 in the lower bearing chamber 241. The lower end is interference fit with the mounting hole 12 of the mounting table 11 in the center of the base 1, and has sufficient interference distance (the height of the mounting table 11), and the end of the first cylinder of the housing 5 is supported by the lower bearing support 24. Therefore, it can be seen that the housing is stressed at both ends, and compared with the prior art in which the housing is supported by one bearing, the structure provided by the utility model can make the housing 5 as a moving part more stable during rotation and not shake.

[0038] Referring toFigure 2 and Figure 3 , cooperate with Figure 7 and Figure 8 as shown, Figure 7 is a schematic diagram of the cross section of the iron core, Figure 8 is a schematic diagram of the cross section of the iron core sleeve. The stator core assembly 3 includes an iron core 31 and an iron core sleeve 32. The inside of the iron core sleeve 32 cooperates with the equal-diameter optical shaft 21, and the outside cooperates with the iron core 31. The inside sidewall of the iron core 31 is provided with a plurality of first through-slots or first protrusions along the axial direction, which are two first protrusions 311 in this embodiment. The outside sidewall of the iron core sleeve 32 is provided with corresponding second protrusions or second through-slots, which are two second through-slots 321 in this embodiment. When the iron core 31 is sleeved on the iron core sleeve 32, the first protrusions 311 cooperate with the second through-slots 321, so that they are positioned together. In order not to damage the iron core 31, the first protrusions 311 and the second through-slots 321 are transitionally fitted. In order to increase the connection firmness of the iron core 31 and the iron core sleeve 32, an adhesive is added to the second through-slots during installation to fix the iron core 31 and the iron core sleeve 32 together.

[0039] The iron core sleeve 32 is sleeved on the equal-diameter optical shaft 21, and in order not to damage the equal-diameter optical shaft 21, the iron core sleeve 32 is transitionally fitted with the equal-diameter optical shaft 21. In order to ensure the connection firmness of the iron core sleeve 32 and the equal-diameter optical shaft 21, the inside sidewall of the iron core sleeve 32 is provided with a plurality of third through-slots 322 along the axial direction. During installation, an adhesive is added to the plurality of third through-slots 322, and when it is sleeved on the equal-diameter optical shaft 21, baking is performed to firmly fix the iron core sleeve 32 and the equal-diameter optical shaft 21 together.

[0040] The two ends of the stator core assembly 3 respectively abut against the inner rings of the bearings through one shaft sleeve 261, 262, as shown in Figure 2 , Figure 3 The shaft sleeve 261, 262 includes a first end and a second end, wherein the end face diameter of the first end is greater than the end face diameter of the second end, and the end face width of the second end is adapted to the width of the inner ring of the bearing; the end face of the first end abuts against the end face of the iron core sleeve 32, and the end face of the second end abuts against the inner ring of the bearing. The bearings (including the lower bearing 22 and the lower bearing 23) in the application are located in the bearing chamber (including the upper bearing chamber and the lower bearing chamber), and one end is limited by the bottom of the bearing chamber. Since the inner ring of the bearing is transitionally fitted with the equal-diameter optical shaft 21, in order to prevent the inner ring of the bearing from moving in the axial direction, the other end of the bearing is limited by the shaft sleeve. This ensures that the upper and lower bearings can be stably located in their respective bearing chambers, and the bearings are not damaged.

[0041] The stator core of the application is arranged between two bearings, so that the overall weight is evenly distributed, thereby reducing the shaking problem caused by uneven weight distribution during rotation.

[0042] Referring to Figure 2 and Figure 3 The rotor magnetic ring 4 is arranged outside the stator core assembly 3, and the outer diameter of the rotor magnetic ring 4 has a matching tolerance with the inner diameter of the shell 5, so that the rotor magnetic ring 4 can be smoothly installed into the shell 5, and the upper end surface of the rotor magnetic ring 4 abuts against the rotor limiting block 54 at the top of the shell 5, and the lower end surface abuts against the bracket fixing part 242 of the lower bearing bracket 24, so that the rotor magnetic ring 4 and the shell 5 can remain relatively stationary and can rotate with the shell.

[0043] In combination with the foregoing figures, the base 1, the equal-diameter optical axis 21, the inner rings of the upper and lower bearings 22 and 23, and the stator core assembly 3 are stationary components of the motor, and the rotor magnetic ring 4, the shell 5, and the lower bearing bracket 24 are rotating components.

[0044] In order to control the motor, the base 1 is provided with a motor circuit board 6, and the circuit board 6 has a motor control circuit, for example, including a controller, a commutation circuit, etc. The circuit board 6 is also provided with an encoder, and a code disc 7 corresponding to the encoder is fixed in the second cylinder of the shell 5, and the code disc 7 has a reflection area. When the motor is running, the code disc 7 rotates with the shell 5, the encoder on the circuit board 6 senses the reflection area to generate an electrical signal to the controller on the circuit board 6, and the controller determines the rotation angle of the motor according to the sensing electrical signal.

[0045] In one embodiment, the stator core is wound with a three-phase winding, and the outgoing lines of the three-phase winding are connected to the commutation circuit on the circuit board. The winding on the stator core is sequentially energized according to the energizing sequence in the commutation table under the control of the controller, thereby generating an alternating electric field, which generates a torque under the action of the rotor magnetic ring 4, thereby driving the rotating components such as the rotor magnetic ring 4, the shell 5, and the lower bearing bracket 24 of the motor to rotate.

[0046] The equal-diameter light shaft is used as support, so that the shaking problem caused by poor concentricity of the stepped shaft is avoided; the rotating part has two stress points through the upper and lower bearings, so that the rotating part runs more smoothly when rotating; the motor housing provided by the application is a whole housing, which comprises an integrated two-section hollow cylindrical structure, the upper cylindrical radius is small, the lower cylindrical radius is large, the lower bearing and the support are matched to support the bottom of the housing for circular motion, and the whole housing ensures that the housing is concentric, runs smoothly, and the lower plane does not fluctuate; the bearing and the equal-diameter light shaft are matched, the bearing is not subjected to other stress conditions except the gravity of the rotating part and the centrifugal force outward during the operation of the motor, and based on the upper and lower distribution of the bearing, the force arm between the two bearings is large during the electric operation, so that the bearing is subjected to small stress, so it can be seen that the motor structure provided by the application can effectively improve the service life of the bearing.

[0047] The motor structure provided by the application can make the motor run smoothly and have a long service life, and when matched with different control modes, can be applied in different fields, for example, applied in the laser radar of unmanned aerial vehicles, unmanned cars and the like, or applied in the field of laser marking machines as a galvanometer motor, so that the application range is wide and the control precision is high.

[0048] The above examples are only used to illustrate the application, and are not limited to the application, and those skilled in the related art can make various changes and modifications without departing from the scope of the application, therefore, all equivalent technical solutions also belong to the scope of the application.

Claims

1. An outer rotor motor structure, comprising a base, a shaft core assembly, a stator core assembly, a rotor magnetic ring and a shell; wherein, a shaft core connecting portion is arranged at the center of the base; an upper bearing chamber is arranged at the center of the inner part of the fixed end of the shell; a rotor limiting block extending into the inner part of the shell is arranged at the edge of the inner part of the fixed end of the shell; the other end of the shell is a free end; the shaft core assembly comprises at least an equal-diameter optical shaft, an upper bearing, a lower bearing and a lower bearing support; the top end of the equal-diameter optical shaft passes through the upper bearing chamber at the center of the inner part of the fixed end of the shell; the upper bearing is arranged in the upper bearing chamber, the outer ring of the upper bearing is connected with the inner wall of the upper bearing chamber, and the inner ring of the upper bearing is connected with the equal-diameter optical shaft; the lower bearing support comprises a lower bearing chamber and a support fixed portion; the lower bearing is arranged in the lower bearing chamber, the inner ring of the lower bearing is connected with the equal-diameter optical shaft, the outer ring of the lower bearing is connected with the inner wall of the lower bearing chamber, and the bottom end of the equal-diameter optical shaft is connected with the shaft core connecting portion at the center of the base through the lower bearing chamber; the support fixed portion is fixedly connected with the free end of the shell; the stator core assembly is arranged outside the equal-diameter optical shaft between the upper bearing and the lower bearing, and the two ends of the stator core assembly are respectively abutted with the inner ring of the bearing through the shaft sleeve; the rotor magnetic ring is arranged outside the stator core assembly, one end of the rotor magnetic ring is limited by the rotor limiting block, and the other end of the rotor magnetic ring is limited by the support fixed portion; the surface of the outer ring of the upper bearing and the surface of the outer ring of the lower bearing are respectively fixedly connected with the inner wall of the upper bearing chamber and the inner wall of the lower bearing chamber; the stator core assembly is fixedly connected with the outside of the equal-diameter optical shaft; the base, the equal-diameter optical shaft, the inner ring of the upper bearing, the inner ring of the lower bearing and the stator core assembly are stationary parts, and the rotor magnetic ring, the shell and the lower bearing support are rotating parts.

2. The outer rotor motor structure according to claim 1, wherein the stator core assembly comprises a core and a sleeve thereof; a plurality of first through-slots or first convex ribs are arranged on the inner side wall of the core along the axial direction, and a plurality of second convex ribs or second through-slots are arranged on the outer side wall of the sleeve along the axial direction; when the core is arranged on the sleeve, the first through-slots or the first convex ribs are matched with the second convex ribs or the second through-slots; a plurality of third through-slots are arranged on the inner side wall of the sleeve along the axial direction, and an adhesive is added in the third through-slots; when the sleeve is arranged on the equal-diameter optical shaft, the third through-slots with the adhesive are used to fix the sleeve and the equal-diameter optical shaft together.

3. The outer rotor motor structure of claim 2, wherein the first through-slots or the first convex ribs are transitionally matched with the second convex ribs or the second through-slots; when the sleeve is installed, the adhesive is added in the first through-slots or the second through-slots to fix the core and the sleeve together; the sleeve is transitionally matched with the equal-diameter optical shaft.

4. The outer rotor motor structure of claim 2, wherein the shaft sleeve comprises a first end and a second end; the end face diameter of the first end of the shaft sleeve is greater than the end face diameter of the second end of the shaft sleeve; the end face width of the second end of the shaft sleeve is adapted to the width of the inner ring of the bearing; the end face of the first end of the shaft sleeve is abutted with the end face of the sleeve; and the end face of the second end of the shaft sleeve is abutted with the inner ring of the bearing.

5. The outer rotor motor structure of claim 1, wherein The shaft core connecting part is a mounting table higher than the base plane, and the mounting table is provided with a mounting hole in interference fit with the bottom end of the equal-diameter optical shaft.

6. The outer rotor motor structure of claim 5, wherein, A plurality of adjusting grooves are provided on the mounting table along the circumferential direction of the mounting hole to adjust the interference fit between the bottom end of the equal-diameter optical shaft and the mounting hole.

7. The outer rotor motor structure of claim 5, wherein The height of the mounting hole in interference fit with the bottom end of the equal-diameter optical shaft is 3-8 mm.

8. The outer rotor motor structure of claim 1, wherein, The outer surface of the base is treated by a light extinction process.

9. The outer rotor motor structure of claim 1, wherein, The rotor limiting block is a convex ring arranged along the edge circumference of the inner part of the fixed end of the shell or a convex block distributed at intervals.

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