Servo motor with axial flow heat dissipation

Abstract

The utility model discloses an axial flow heat radiation servo motor, comprising a casing provided with a cover, the cover is provided with a plurality of air holes, and the casing is rotatably connected with a rotating shaft; the stator assembly is in a circular ring shape and is connected into the machine shell. The rotor assembly is connected to the rotating shaft, the stator assembly surrounds the rotor assembly, and an annular air gap is formed between the rotor assembly and the stator assembly; and the cooling fan comprises an end seat and a plurality of fan blades, the end seat is in a circular ring shape, the end seat is connected to the end part of the rotor assembly, all the fan blades are distributed along the circumferential surface of the end seat, the fan blades are overlapped with the air gaps, the fan blades are overlapped with the air holes, the fan blades are bent towards the extension direction of the rotating shaft, and the fan blades are in central symmetry about the rotating surface of the end seat. The heat dissipation device is compact and reliable in structure, heat dissipation cost can be effectively saved, pertinence of fan blade operation heat dissipation is high, the energy utilization rate is high, heat dissipation efficiency is high, operation stability is high, and stable heat dissipation under the bi-directional rotation working condition can be guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of servo motors, and in particular to a servo motor with axial flow cooling. Background Technology

[0002] An electric motor is a device that converts electrical energy into mechanical energy. A servo motor can convert voltage signals into torque and speed, and can control the running speed and position. Servo motors are widely used in industrial automation, robots, CNC machine tools and other fields.

[0003] Servo motors often need to operate under conditions of high power density and long-term operation. Under such conditions, servo motors often generate a lot of heat, which can cause the servo motor temperature to become too high, affecting its performance and service life, and resulting in insufficient stability of rotational force output. In order to reduce heat accumulation, related technologies usually add heat dissipation equipment to the outside of the servo motor. However, this method of heat dissipation is costly, takes up a lot of space, and has a poor cooling effect on internal structures that are prone to heat accumulation. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an axial flow cooling servo motor, which has high heat dissipation efficiency, a compact and reliable structure, small footprint, low cooling cost, and stable and reliable operation.

[0005] A servo motor with axial flow cooling according to an embodiment of the present invention includes:

[0006] The casing is equipped with a cover, which has several ventilation holes that connect the external environment with the internal space of the casing. The casing is rotatably connected to a pivot.

[0007] The stator assembly is annular and connected inside the housing;

[0008] The rotor assembly is connected to the rotating shaft, and the stator assembly surrounds the rotor assembly, with an annular air gap formed between the rotor assembly and the stator assembly.

[0009] The cooling fan includes an end base and several fan blades. The end base is circular and connected to the end of the rotor assembly. All the fan blades are distributed along the circumferential surface of the end base. The projection of the fan blades in the extension direction of the rotating shaft overlaps with the air gap. The projection of the fan blades in the extension direction of the rotating shaft overlaps with the vent holes. The fan blades are bent along the circumferential surface of the end base in the extension direction of the rotating shaft. The fan blades are symmetrical about the rotational surface of the end base.

[0010] In this embodiment, there are two cooling fans, which are respectively connected to the opposite ends of the rotor assembly.

[0011] In this embodiment, the stator assembly includes a stator frame and a stator core. The stator frame is connected to the stator core and the housing respectively. The stator core is used to wind coils and surrounds the inner wall of the housing.

[0012] In this embodiment, the rotor assembly includes a rotor core and a magnet. The rotor core is connected to the rotating shaft, and the magnet is connected to the outside of the rotor core, with the magnet facing the stator core.

[0013] In this embodiment, the rotor core is provided with several through holes extending along the extension direction of the rotating shaft.

[0014] In this embodiment, the end seat is provided with a lightweight groove.

[0015] In this embodiment, both ends of the rotating shaft are connected to the housing via bearings.

[0016] In this embodiment, an encoder is provided between the rotating shaft and the cover.

[0017] In this embodiment, the outer surface of the casing is provided with several heat dissipation fins.

[0018] The embodiments of this utility model have at least the following beneficial effects:

[0019] By axially arranging the cooling fan at the end of the rotor assembly, space utilization is effectively improved, resulting in a compact and reliable structure that effectively controls the size of the servo motor. This facilitates application, and when the rotor assembly rotates relative to the stator assembly, the cooling fan rotates with it, creating excellent heat dissipation and cooling effects. This, in turn, improves the servo motor's performance and lifespan. The stator and rotor assemblies output rotational force through electromagnetic induction, simultaneously driving the cooling fan to rotate and dissipate heat. This effectively saves on the investment and operating costs of external cooling equipment and conserves space. Furthermore, the overlapping of the fan blades and air gap along the extension direction of the shaft allows the airflow generated by the fan blades during operation to flow directly through the air gap, simultaneously... The internal stator assembly and its components achieve heat dissipation and cooling, providing comprehensive and reliable heat dissipation to the heat source. This prevents localized overheating, and the fan blades offer highly targeted heat dissipation with high energy utilization. The smooth airflow reduces wind resistance loss, resulting in high heat exchange efficiency and heat dissipation. This effectively reduces heat accumulation in the servo motor, significantly improving performance and enhancing stability and reliability. The relative placement of the vents and fan blades further improves heat exchange efficiency with the external environment, thereby enhancing overall heat dissipation performance. The fan blades are axially curved and symmetrical about the rotational plane of the end seat, ensuring the axial airflow trajectory and stable heat dissipation under bidirectional rotation conditions, providing flexible cooling performance. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 A three-dimensional structural diagram of the servo motor for axial flow heat dissipation according to an embodiment of this utility model;

[0022] Figure 2 A partial cross-sectional view of the servo motor with axial cooling according to an embodiment of the present invention;

[0023] Figure 3 This is a front view schematic diagram of the axial flow cooling servo motor according to an embodiment of the present utility model.

[0024] Figure 4 For along Figure 3 A schematic diagram of the cross-sectional structure of line A-A';

[0025] Figure 5 This is an exploded view of the servo motor for axial flow cooling according to an embodiment of the present invention.

[0026] Figure label:

[0027] Housing 100, cover 110, vent 111, shaft 120, bearing 121, encoder 130, heat dissipation fins 140;

[0028] Stator assembly 200, stator frame 210, stator core 220;

[0029] Rotor assembly 300, air gap 301, rotor core 310, through hole 311, magnet 320;

[0030] Cooling fan 400, end base 410, lightweight groove 411, fan blade 420. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, left, right, front, and back, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] In the description of this utility model, if the wire sleeve or bracket is mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0034] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0035] Servo motors can convert voltage signals into torque and speed, enabling control of running speed and position. Servo motors are widely used in industrial automation, robotics, CNC machine tools and other fields.

[0036] Servo motors often operate under conditions of high power density and long-term operation. Under these conditions, servo motors tend to generate a large amount of heat, leading to excessively high temperatures that affect performance and lifespan, as well as insufficient stability of rotational force output. To reduce heat accumulation, related technologies typically add independent fans or cooling devices to the outside of the servo motor. However, this method is costly and occupies a large amount of additional space. The airflow from the independent fan is difficult to enter the interior of the servo motor, and its cooling effect on internal structures that easily accumulate heat is poor. In particular, the internal structure containing the windings is the main source of heat generation, and the cooling methods in related technologies cannot effectively cool this part of the internal structure. As a result, the performance of the servo motor cannot be guaranteed, and its operational stability and reliability are insufficient.

[0037] The following is for reference only. Figure 1 To be continued Figure 5 The axial flow cooling servo motor described in this utility model embodiment has high heat dissipation efficiency, compact and reliable structure, small space occupation, low heat dissipation cost, and stable and reliable operation.

[0038] Reference Figures 1 to 5 An axial flow cooling servo motor according to an embodiment of the present invention includes:

[0039] The housing 100 is provided with a cover 110, which is connected to one end of the housing 100. The cover 110 is provided with several ventilation holes 111 that connect the external environment and the internal space of the housing 100. The housing 100 is rotatably connected to a rotating shaft 120.

[0040] The stator assembly 200 is annular and connected to the housing 100, forming an annular surrounding structure;

[0041] The rotor assembly 300 is connected to the rotating shaft 120, and the rotating shaft 120 passes through the axis of the rotor assembly 300 so that the rotor assembly 300 can rotate relative to the housing 100. The stator assembly 200 surrounds the rotor assembly 300, and an annular air gap 301 extending along the extension direction of the rotating shaft 120 is formed between the rotor assembly 300 and the stator assembly 200.

[0042] The cooling fan 400 includes an end base 410 and a plurality of fan blades 420. The end base 410 is annular and is connected to the end of the rotor assembly 300. Preferably, the end base 410 is also connected to the rotating shaft 120 to improve the stability of the rotation of the end base 410. All the fan blades 420 are evenly distributed along the circumferential surface of the end base 410. The projection of the fan blades 420 in the extending direction of the rotating shaft 120 overlaps with the air gap 301. That is, along the extending direction of the rotating shaft 120, the projection of the fan blades 420 and the projection of the air gap 301 partially overlap. The airflow generated when the fan blades 420 rotate can effectively pass through the air gap 301, thereby achieving reliable cooling of both the stator assembly 200 and the rotor assembly 300. The projection of the fan blade 420 in the extension direction of the 0 overlaps with the vent 111, that is, the projection of the fan blade 420 on the cover 110 partially overlaps with the vent 111, which can effectively improve the efficiency of heat exchange with the external environment. The fan blade 420 bends along the circumferential surface of the end seat 410 toward the extension direction of the rotating shaft 120. The fan blade 420 is symmetrical about the rotation surface of the end seat 410. The rotation surface of the end seat 410 is perpendicular to the rotating shaft 120 and passes through the center of the end seat 410. The fan blade 420 can achieve airflow drive in both forward and reverse directions along the extension direction of the rotating shaft 120. When the servo motor achieves forward and reverse rotation, the cooling fan 400 can cool down the rotor assembly 300 and the stator assembly 200, which can effectively improve the working efficiency of the servo motor.

[0043] By axially arranging the cooling fan 400 at the end of the rotor assembly 300, space utilization can be effectively improved, resulting in a compact and reliable structure. This effectively controls the size of the servo motor and facilitates its application. When the rotor assembly 300 rotates relative to the stator assembly 200, the cooling fan 400 can rotate with the rotor assembly 300, thus achieving a good heat dissipation and cooling effect, thereby improving the working performance and service life of the servo motor. The stator assembly 200 and the rotor assembly 300 output rotational force through electromagnetic induction, driving the cooling fan 400 to rotate and dissipate heat. This effectively saves the investment and operating costs of external heat dissipation equipment and saves space. In addition, by forming an overlap between the fan blades 420 and the air gap 301 in the extension direction of the rotating shaft 120, the airflow generated by the fan blades 420 during operation can directly flow through the air gap 301, simultaneously dissipating heat and cooling the internal stator assembly 200 and the stator assembly 200.

[0044] Compared to existing technologies that use external cooling devices, the fan blades 420 inside the housing 100 of this servo motor can directly and effectively dissipate heat from the internal structure. Compared to some technologies that only cool the rotor, this servo motor can utilize the air gap 301 for heat dissipation. Regardless of whether the windings are located in the stator assembly 200 or the rotor assembly 300, it can achieve a comprehensive and reliable heat dissipation effect on the heat source, avoiding excessively high local temperatures. The fan blades 420 have strong targeted heat dissipation, high energy utilization, and smooth airflow, which can reduce wind resistance loss and achieve high heat exchange efficiency. This effectively reduces the heat accumulation of the servo motor, significantly improves its performance, and enhances its stability and reliability. Furthermore, the relative arrangement of the vent 111 and the fan blades 420 improves the efficiency of heat exchange with the external environment, thereby further improving the overall heat dissipation performance. Through precisely guided airflow, the operating temperature of the stator assembly 200 and the rotor assembly 300 can be effectively reduced, thereby reducing thermal decay and improving the stability of the motor output. The fan blade 420 is bent along the axial direction and is symmetrical about the rotation surface of the end seat 410, which can ensure the trajectory of airflow along the axial direction. Moreover, it can achieve reliable heat dissipation regardless of whether the servo motor rotates forward or backward, that is, it can ensure stable heat dissipation under bidirectional rotation conditions and the heat dissipation effect is flexible.

[0045] It is understood that there are two cooling fans 400, which are symmetrically connected to the opposite ends of the rotor assembly 300, and both cooling fans 400 are fixedly connected to the rotating shaft 120.

[0046] The two cooling fans 400 can be configured to airflow in opposite or unidirectional directions according to application requirements to achieve heat dissipation. By dissipating heat from different locations with two cooling fans 400, the heat dissipation performance of this servo motor can be effectively improved, the uniformity of heat dissipation can be effectively improved, heat can be effectively prevented from accumulating in local areas of the servo motor, and the working performance can be effectively improved.

[0047] It is understood that the stator assembly 200 includes a stator frame 210 and a stator core 220. The stator frame 210 connects the stator core 220 and the housing 100 respectively to achieve a rigid fixed connection between the stator core 220 and the housing 100. The stator core 220 is used to wind coils, also known as windings. The coils can be further insulated to form electrical isolation between them and the stator core 220. The coils are used to connect to the power supply and form a corresponding electromagnetic field. The stator core 220 surrounds the inner wall of the housing 100 to form an annular columnar structure. The stator core 220 coaxially surrounds the inner peripheral wall of the housing 100 and forms a uniform air gap 301 between it and the rotor assembly 300.

[0048] By placing the coil in the stator core 220, and fixing the stator core 220 to the housing 100 via a stator bracket, the load on the rotor assembly 300 can be effectively reduced, thereby reducing the operating burden of the servo motor, resulting in high energy utilization and significant savings in operating costs. Furthermore, it reduces the moment of inertia of the rotor assembly 300, which is a rotating component, effectively reducing energy loss during start-up, shutdown, or speed changes, and improving dynamic response performance. Preferably, the stator core 220 can be made of multiple high-permeability silicon steel sheets stacked together, which can reduce losses such as eddy currents.

[0049] It is understood that the rotor assembly 300 includes a rotor core 310 and a magnet 320. The rotor core 310 is fixedly connected to the shaft 120 by an interference fit or keyway structure. The magnet 320 is connected to the outside of the rotor core 310. The magnet 320 can be made of high-performance rare earth permanent magnet material, such as neodymium iron boron. The circumferential profile of the rotor core 310 is the profile of the circumferential surface of a cylinder. The magnet 320 is uniformly embedded on the outer circumferential surface of the rotor core 310 by adhesive bonding or slot structure, so that an accurate and reliable air gap 301 is maintained between the magnet 320 and the inner surface of the stator core 220. The magnet 320 faces the stator core 220, which can effectively improve the magnetic induction effect between the rotor assembly 300 and the stator assembly 200, thereby effectively improving the operation effect of the servo motor.

[0050] Preferably, the rotor core 310 is made of high permeability silicon steel sheets, which can effectively reduce unnecessary eddy current losses. The high-performance material of the permanent magnet can effectively ensure a strong and stable magnetic field strength, which can effectively improve the overall operating energy efficiency.

[0051] It should be noted that multiple sets of magnets 320 are provided, and each set of magnets 320 is arranged around the circumferential surface of the rotor core 310. That is, each set of magnets 320 is evenly distributed in a circular trajectory around the axis of the rotating shaft 120. With the axis of the rotating shaft 120 as the center, each set of magnets 320 is arranged and wound at a preset starting angle, and the starting angle of each pair of adjacent sets of magnets 320 is different. By staggering the magnetic poles, the changes in the magnetic field are effectively counteracted, thereby reducing local saturation and eddy current losses in the rotor core 310, and effectively improving the stability of the output rotational force of this servo motor.

[0052] It is understandable that the rotor core 310 is provided with several through holes 311 extending along the extension direction of the rotating shaft 120, that is, the axis of the through holes 311 is parallel to the rotating shaft 120, and each through hole 311 is evenly distributed along the circumference of the rotor core 310. The total cross-sectional area of ​​the through holes 311 accounts for 20% to 35% of the cross-sectional area of ​​the rotor core 310, thereby achieving a reduction in rotor weight while ensuring structural strength.

[0053] The through-hole 311 not only enables a lightweight design for the rotor core 310, effectively reducing the operating load of the servo motor and further improving energy utilization; it also reduces the rotational inertia of the servo motor, effectively improving its response speed and ensuring accurate and reliable control. Furthermore, the through-hole 311 provides more space for airflow, improving the smoothness of the airflow path, effectively enhancing heat dissipation efficiency, and ultimately improving the performance of the servo motor.

[0054] Understandably, the end seat 410 is provided with a lightweight groove 411, which can effectively reduce the weight of the cooling fan 400, thereby reducing the load on the rotor assembly 300. This not only effectively extends the service life of the rotor assembly 300, but also reduces the energy consumption during operation, resulting in high energy utilization and saving operating costs.

[0055] Specifically, the lightweight groove 411 is located on the side of the end seat 410 away from the rotor assembly 300. When the rotor core 310 is provided with several through holes 311, the end seat 410 is also provided with several clearance grooves corresponding to each through hole 311, which are used to provide a reliable passage for airflow.

[0056] It is understood that both ends of the rotating shaft 120 are connected to the housing 100 through bearings 121. That is, there are two bearings 121 inside the housing 100, and the two bearings 121 are respectively connected to the two ends of the rotating shaft 120. The rotating shaft 120 and the housing 100 are connected through the bearings 121, which can effectively improve the stability of the rotation of the rotating shaft 120, thereby improving the reliability of the rotor assembly 300 when rotating relative to the stator assembly 200, and improving the overall stability of the servo motor operation.

[0057] Specifically, one end of the rotating shaft 120 is connected to the housing 100 via a bearing 121, and the other end of the bearing 120 is connected to the cover 110 via another bearing 121, which can effectively improve the overall structural strength and balance.

[0058] It is understandable that an encoder 130 is provided between the rotating shaft 120 and the cover 110. The encoder disk of the encoder 130 is located on the cover 110, and the probe of the encoder 130 is connected to the rotating shaft 120. The encoder 130 detects the rotational position of the rotor assembly 300, which can effectively improve the control accuracy of the servo motor.

[0059] Preferably, the encoder 130 is a high-precision photoelectric encoder 130, with an optical code disk connected to the inside of the housing 100. The surface of the code disk is provided with a precise grating scale, and the reading head is rigidly connected to the end of the rotating shaft 120, which can monitor the angular displacement and rotation speed signals of the rotating shaft 120 in real time.

[0060] Understandably, the outer surface of the housing 100 is provided with several heat dissipation fins 140, which are evenly distributed circumferentially on the circumferential surface of the housing 100. The heat dissipation fins 140 increase the contact area between the housing 100 and the external environment, thereby effectively improving the heat dissipation performance of the servo motor and reducing heat accumulation. Combined with the internal cooling fan 400, the servo motor can be cooled from both internal and external areas, effectively improving its operating performance and ensuring stable and reliable output.

[0061] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A shaft flow cooling servo motor, characterized in that, The application relates to a fan, which comprises a casing (100) provided with a cover (110) provided with a plurality of air holes (111) for communicating with the outside environment and the inner space of the casing (100), and a rotating shaft (120) rotatably connected to the casing (100); a stator assembly (200) in the form of a ring and connected to the casing (100); a rotor assembly (300) connected to the rotating shaft (120), the stator assembly (200) being arranged around the rotor assembly (300), and a circular air gap (301) being formed between the rotor assembly (300) and the stator assembly (200); and a cooling fan (400) comprising an end seat (410) in the form of a ring and a plurality of fan blades (420), the end seat (410) being connected to the end of the rotor assembly (300), all the fan blades (420) being distributed along the circumferential surface of the end seat (410), the projection of the fan blades (420) on the extension direction of the rotating shaft (120) overlapping the air gap (301), the projection of the fan blades (420) on the extension direction of the rotating shaft (120) overlapping the air holes (111), and the fan blades (420) being curved along the circumferential surface of the end seat (410) towards the extension direction of the rotating shaft (120) and being symmetric about the center of the rotating surface of the end seat (410). The cooling fan (400) is provided with two, and the two cooling fans (400) are respectively connected to the opposite ends of the rotor assembly (300). The stator assembly (200) comprises a stator wire frame (210) and a stator core (220), the stator wire frame (210) being connected to the stator core (220) and the casing (100) respectively, the stator core (220) being used for winding a coil, and the stator core (220) being arranged around the inner wall of the casing (100). The rotor assembly (300) comprises a rotor core (310) and a magnet (320), the rotor core (310) being connected to the rotating shaft (120), and the magnet (320) being connected to the outside of the rotor core (310) and facing the stator core (220). The rotor core (310) is provided with a plurality of through holes (311) penetrating along the extension direction of the rotating shaft (120).

2. The axial-flow heat-dissipating servo motor according to claim 1, wherein, The end seat (410) is provided with a light recess (411).

3. The axial-flow heat-dissipating servo motor according to claim 1, wherein The opposite ends of the rotating shaft (120) are connected to the casing (100) through bearings (121).

4. The axial-flow, liquid-cooled servo motor of claim 3 wherein: An encoder (130) is arranged between the rotating shaft (120) and the cover (110).

5. The axial cooling servo motor according to claim 4, wherein, The casing (100) is externally provided with a plurality of cooling fins (140).

6. A shaft-flow cooled servo motor according to any one of claims 3 to 5, wherein ​ 7. The axial cooling servo motor according to claim 1, wherein ​ 8. The axial heat-dissipating servo motor according to claim 1, wherein, ​ 9. The axial cooling servo motor according to claim 1, wherein, ​

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