Motor structure

Abstract

A motor structure provided by the present invention comprises a motor outer shell, a heat dissipation shell is fixedly arranged between the motor outer shell and a stator, the heat dissipation shell is internally provided with a plurality of groups of air guide pipes, and the inner sides of the air guide pipes are provided with air guide channels communicating with a first cavity and a second cavity. Silencers are fixedly arranged on the inner side wall of the front end cover and the inner side wall of the rear end cover, the heat dissipation capacity of the heat dissipation shell on the stator and the rotor is enhanced through heat conduction oil in the heat dissipation shell, air guide channels and heat dissipation fins are arranged in the heat dissipation shell, the air circulation area of spaces on the two sides of the stator and the rotor can be increased, and therefore the good heat exchange effect is achieved. Noise reduction pasters on the heat dissipation fins and silencers on the inner side walls of the end covers not only have a good noise reduction effect, but also have a heat conduction effect to a certain extent, and the air guide holes with different sectional areas can play a good blocking role in a transmission path of sound waves and do not affect discharge of airflow at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of treadmill motors, and in particular to a motor structure. Background Art

[0002] A treadmill is a home or commercial fitness equipment that simulates the outdoor running experience and allows users to perform aerobic exercise in a fixed space. As the core component of a treadmill, the motor is of great importance. It is responsible for driving the running belt and providing a continuous and stable exercise platform for runners. The performance of the motor is directly related to the operating efficiency, noise control, speed adjustment and durability of the treadmill. Therefore, a high-quality motor is the key to ensure the smooth operation of the treadmill and meet the diverse exercise needs of users.

[0003] During the use of treadmill motors, the main problems are heat and noise. Currently, the heat dissipation of the motor mainly relies on the cooling fan installed on the motor shaft end to extract the hot air inside the motor for heat dissipation. Since the air circulation speed in the motor casing is limited, the heat dissipation effect of this method is not good. As the temperature of the motor rises, the internal components of the motor expand and contract, resulting in greater friction and vibration, and then greater noise. Treadmill motor noise control is crucial to improving the user experience. A low-noise motor can create a more focused and comfortable exercise environment for users. Summary of the invention

[0004] The present invention provides a motor structure, comprising: A motor housing, wherein a stator is fixedly disposed inside the motor housing, a rotatable rotor is disposed inside the stator, and a rotating shaft is fixed at the axial center position of the rotor; A front end cover is disposed at the front end of the motor housing, and a first vent hole is opened on the front end cover; A rear end cover is provided at the rear end of the motor housing, and a second vent hole is opened on the rear end cover; The front end of the rotating shaft passes through the front end cover and is connected to a driving wheel; A first cavity is provided between the stator and the front end cover, a second cavity is provided between the stator and the rear end cover, a heat dissipation fan is provided on the rotating shaft corresponding to the first cavity, a heat dissipation shell is provided between the peripheral side of the stator and the motor outer shell, and when the motor is running, the heat generated by the rotor and the stator is conducted to the heat dissipation shell; A plurality of groups of air guide pipes are arranged inside the heat dissipation shell, and the air guide pipes have air guide channels connecting the first cavity and the second cavity; When the rotor rotates, it drives the heat dissipation fan to rotate, so that external air enters the second cavity, passes through the air guide channel into the first cavity, and is then discharged through the first vent hole.

[0005] Preferably, the heat dissipation shell includes a rectangular shell and an annular shell located inside the rectangular shell, the four groups of air ducts are respectively arranged inside the four corners of the rectangular shell, and a closed heat conduction cavity is provided between the air duct and the rectangular shell and the annular shell, and a heat conduction medium is provided inside the heat conduction cavity; The front end and the rear end of the heat dissipation shell are respectively provided with heat dissipation fins. The heat dissipation fins at the front end of the heat dissipation shell extend into the first cavity, and the heat dissipation fins at the rear end of the heat dissipation shell extend into the second cavity.

[0006] Preferably, the heat dissipation fins at the front end and the rear end of the heat dissipation shell are respectively provided in plurality, and the heat dissipation fins at each end are respectively arranged at intervals around the stator, and a heat dissipation channel is provided between any two adjacent heat dissipation fins.

[0007] Preferably, the heat dissipation fin portion extends into the interior of the heat conduction cavity, and the length of the heat dissipation fin portion located in the heat conduction cavity is smaller than the length of the heat conduction cavity, so that the heat conduction cavity has a continuous channel for the heat conduction medium to flow in the circumferential direction of the stator, and the multiple heat dissipation fins located in the heat conduction cavity are distributed symmetrically around the axis of the rotating shaft.

[0008] Preferably, a noise reduction patch is attached to the surface wall of the heat dissipation fin, and a groove structure is provided on the surface of the noise reduction patch.

[0009] Preferably, the heat dissipating fins include solid or hollow fin structures.

[0010] Preferably, silencers are fixedly provided on the inner side walls of the front cover and the rear cover respectively, and the silencers include three silencer rings, the axes of the three silencer rings are parallel to the axis of the rotating shaft, and the three silencer rings are coaxially stacked; The contact side or both sides of the silencer ring are provided with silencer patches; The silencer ring is provided with air guide holes along the axial direction, and the diameter of the air guide holes on the inner silencer ring is larger than the diameter of the air guide holes on the outer silencer ring.

[0011] Preferably, a connecting piece is installed between any two adjacent silencer rings, the connecting piece includes a temperature-sensitive memory metal sheet, and both ends of the connecting piece are respectively connected to the two adjacent silencer rings, and the connecting piece is configured to adjust the relative deflection angle between the two silencer rings at a set temperature.

[0012] Preferably, the relative position between the two silencer rings connected by the connecting member includes a first position and a second position, when the two silencer rings are in the first position, the air guide holes on the two silencer rings are staggered in the circumferential direction, and when the two silencer rings are in the second position, the air guide holes on the two silencer rings overlap or are coaxially distributed in the axial direction, and both correspond to the first air hole or the second air hole, and the connecting member is configured to adjust the relative position between the silencer rings from the first position to the second position when the temperature inside the motor housing rises to a set temperature.

[0013] Preferably, a mounting seat is provided inside a side of the driving wheel facing the front end cover, a baffle is slidably mounted on the mounting seat, a guide slide arm is fixedly mounted on the baffle, and the mounting seat is provided with a slideway for the guide slide arm to slide; The baffle plate includes a third position and a fourth position along the movable path of the guide slide arm, and when the baffle plate is in the third position, the baffle plate covers the outside of the first vent hole, and when the baffle plate is in the fourth position, the baffle plate covers the inner surface of the driving wheel, and a gap of more than 10 mm is provided between the driving wheel and the front end cover. When the driving wheel rotates, the baffle plate moves from the third position to the fourth position, and when the driving wheel stops, the baffle plate moves from the fourth position to the third position.

[0014] Compared with the prior art, the advantages of the present invention are: In the present invention, a heat dissipation shell is installed at a position corresponding to the stator in the motor housing. The heat dissipation shell enhances the heat dissipation capacity of the stator through the heat transfer oil inside the heat dissipation shell. At the same time, an air guide channel is arranged in the heat dissipation shell, and heat dissipation fins are arranged on both sides of the heat dissipation shell, which can increase the air circulation area of ​​the space on both sides of the stator and the rotor, and further increase the contact area between the air and the stator, the heat dissipation shell and the motor housing, thereby achieving a better heat exchange effect.

[0015] In the present invention, noise reduction patches are arranged on the heat dissipation fins, and silencers are fixedly provided on the inner walls of the front cover and the rear cover, which not only have a good noise reduction effect, but also have a heat conduction effect to a certain extent. The air guide holes with different cross-sectional areas can play a good barrier role in the transmission path of sound waves without affecting the discharge of airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For clarity, not every component is labeled in every figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, in which: Figure 1is a three-dimensional structural schematic diagram of a motor structure shown in an embodiment of the present invention; Figure 2 is a schematic diagram of the internal structure of a motor structure shown in an embodiment of the present invention; Figure 3 is a schematic diagram of the internal structure at a diagonal position of a motor structure shown in an embodiment of the present invention; Figure 4 yes Figure 2 Schematic diagram of the cross-sectional structure along the AA direction; Figure 5 yes Figure 2 Schematic diagram of the cross-sectional structure along the middle BB direction; Figure 6 yes Figure 2 Schematic diagram of the cross-sectional structure in the CC direction; Figure 7 is a schematic structural diagram of a heat dissipation fin shown in an embodiment of the present invention; Figure 8 is a schematic structural diagram of a muffler shown in an embodiment of the present invention; Fig. 9 is a schematic diagram of the disassembled structure of the muffler shown in an embodiment of the present invention; Fig.10 is a schematic diagram of the side structure of the muffler shown in an embodiment of the present invention; 10. Motor outer shell; 101. First cavity; 102. Second cavity; 20. Rotor; 21. Rotating shaft; 22. Cooling fan; 23. Magnetic ring; 24. Magnetoelectric sensor; 30. Stator; 40. Cooling shell; 400. Heat conduction cavity; 41. Air duct; 410. Air conduction channel; 42. Cooling fins; 420. Cooling channel; 421. Noise reduction patch; 50. Front cover; 500. First vent hole; 60. Rear cover; 600. Second vent hole; 70. Bearing; 80. Muffler; 81. First silencer ring; 810. First air conduction hole; 82. Second silencer ring; 820. Second air conduction hole; 83. Third silencer ring; 830. Third air conduction hole; 84. Muffler patch; 85. Connector; 90. Driving wheel; 91. Mounting seat; 92. Baffle; 921. Guide slide arm. DETAILED DESCRIPTION

[0017] In order to better understand the technical content of the present invention, specific embodiments are given and described as follows in conjunction with the accompanying drawings.

[0018] The heat dissipation performance of the motor is crucial to the operation of the motor. It can effectively prevent the motor from overheating, ensure the stable operation of the motor and extend its service life. The airflow path design inside the motor is crucial to the heat dissipation and noise control of the motor. Through a reasonable ventilation structure and airflow path design, it can be ensured that the motor maintains a low temperature and noise level while running efficiently. For treadmill motors, the low noise of the motor is particularly important for user experience. Therefore, the present invention proposes a motor structure to improve the heat dissipation capacity of the motor and reduce the noise of the motor. The motor mainly includes a motor housing 10, a rotor 20, a stator 30, a front cover 50 and a rear cover 60.

[0019] like Figure 1 and Figure 2 As shown, a stator 30 and a rotor 20 rotatably mounted on the inner side of the stator 30 are fixedly arranged inside the motor housing 10, a rotating shaft 21 is fixedly arranged at the axial position of the rotor 20, a front end cover 50 is fixedly mounted on the front end of the motor housing 10 by installing screws at four corners, a rear end cover 60 is fixedly mounted on the rear end of the motor housing 10 by installing screws at four corners, two bearings 70 are respectively mounted at the connection between the rotating shaft 21 and the front end cover 50 and the rear end cover 60, a driving wheel 90 is fixedly mounted on the front end of the rotating shaft 21, and can drive the belt on the treadmill to rotate, wherein the motor can be a brushed motor or a brushless motor, when a brushed motor is adopted, a brush and a commutator matched with the brush are installed on the rotating shaft 21, when a brushless motor is adopted, a magnetic ring 23 and a magnetoelectric sensor 24 matched with the magnetic ring 23 are installed on the rotating shaft 21, a plurality of magnetic poles of the magnetic ring 23 are inductively sensed with the magnetoelectric sensor 24 (Hall sensor), so as to test the speed and efficiency of the motor, and can control the operation of the motor according to the signal provided by the magnetic ring 23.

[0020] Furthermore, a first air vent 500 is provided on the front end cover 50, and a second air vent 600 is provided on the rear end cover 60. A first cavity 101 is provided inside the motor housing 10 along the axial direction of the rotating shaft 21 corresponding to the front side of the stator 30, and a second cavity 102 is provided corresponding to the rear side of the stator 30. A cooling fan 22 is fixedly installed on the outer wall of the rotating shaft 21 corresponding to the first cavity 101, so that the gas in the motor housing 10 flows unidirectionally under the action of the cooling fan 22. It can be understood that, if space permits, a cooling fan 22 can also be installed in the space on the rotating shaft 21 corresponding to the second cavity 102 to enhance the air supply capacity.

[0021] In some embodiments, a plurality of first air vents 500 are provided on the front end cover 50 in a centrally symmetrical distribution with the rotating shaft 21 as the center. Correspondingly, a plurality of second air vents 600 are provided on the rear end cover 60 in a centrally symmetrical distribution with the rotating shaft 21 as the center. The cooling fan 22 installed on the rotating shaft 21 corresponds to the first cavity 101, and is used to conduct the heat generated during the operation of the rotor 20 and the stator 30 from the first cavity 101 to the motor housing 10, and then suck the external cold air into the second cavity 102. The cold air entering the second cavity 102 passes through the rotor 20 and the stator 30 and then enters the first cavity 101, so that heat exchange is formed between the cold air and the rotor 20 and the stator 30, so as to cool the rotor 20 and the stator 30. When two cooling fans 22 are provided, the two cooling fans 22 are respectively in the first cavity 101 and the second cavity 102, and the wind guide directions of the two cooling fans 22 are consistent, which can accelerate the circulation speed of the airflow.

[0022] In this way, a first vent hole 500 is provided at the front cover 50, and a second vent hole 600 is provided at the rear cover 60, so that external air can pass through the motor housing 10 from the inside, promoting heat exchange between the external cold air and the rotor 20 and the stator 30 inside the motor housing 10, thereby improving the heat dissipation efficiency.

[0023] Furthermore, a heat dissipation shell 40 is fixedly provided between the stator 30 and the motor outer shell 10 , and a plurality of air guide pipes 41 are provided inside the heat dissipation shell 40 . The inner side of the air guide pipe 41 has an air guide channel 410 connecting the first cavity 101 and the second cavity 102 .

[0024] In some embodiments, the air guide channels 410 are centrally symmetrically distributed around the axis of the rotating shaft 21. Taking the example of the cooling fan 22 guiding the air in the second cavity 102 to the first cavity 101 during operation, the provision of multiple groups of air guide channels 410 can accelerate the flow of air in the second cavity 102 to the first cavity 101, and the air guide channels 410 are centrally symmetrically distributed, which can circulate evenly, so that the cooling effect of each area of ​​the stator 30 is approximately consistent.

[0025] In a specific embodiment, Figure 4 , Figure 5 and Figure 6 As shown, the cross section of the motor housing 10 is a rectangular structure, with a certain space between its four corners and the outside of the stator 30 , and four groups of air guide pipes 41 are arranged, respectively on the inside of the four corners of the motor housing 10 .

[0026] like Figure 2 , Figure 3 and Figure 7As shown, the heat dissipation shell 40 includes a rectangular shell and an annular shell located inside the rectangular shell, four groups of air ducts 41 are respectively arranged on the inner side of the four corners of the rectangular shell, a closed heat conduction cavity 400 is provided between the air duct 41 and the rectangular shell and the annular shell, a heat conduction medium is provided inside the heat conduction cavity 400, and the heat conduction medium can be heat conduction oil, and heat dissipation fins 42 are respectively provided at the front end and the rear end of the heat dissipation shell 40, the heat dissipation fins 42 at the front end of the heat dissipation shell 40 extend to the first cavity 101, and the heat dissipation fins 42 at the rear end of the heat dissipation shell 40 extend into the second cavity 102, the heat dissipation fins 42 at the front end and the rear end of the heat dissipation shell 40 are respectively provided in plurality, and the heat dissipation fins 42 at each end are respectively arranged at intervals around the stator 30, and a heat dissipation channel 420 is provided between any two adjacent heat dissipation fins 42.

[0027] The heat transfer oil in the heat dissipation shell 40 can contact the outer shell of the stator 30 to dissipate heat, and absorb the heat generated by the stator 30 when working into the heat transfer oil. When the airflow passes through the air guide pipe 41, the heat transfer oil and the air are exchanged to achieve the cooling of the stator 30 and the heat transfer oil. In this way, the heat dissipation capacity of the motor to the stator 30 can be enhanced. At the same time, a plurality of heat dissipation fins 42 are provided. When the air circulating in the first cavity 101 and the second cavity 102 passes through the heat dissipation fins 42, the contact area between the air and the stator 30, the heat dissipation shell 40 and the motor outer shell 10 is further increased, thereby achieving a better heat exchange effect.

[0028] like Figure 4 , Figure 5 and Figure 6 As shown, further, in order to enhance the heat dissipation capacity, part of the heat dissipation fins 42 extend into the interior of the heat conduction cavity 400, and the length of the heat dissipation fins 42 located in the heat conduction cavity 400 is less than the length of the heat conduction cavity 400, so that the heat conduction cavity 400 has a continuous channel for the circulation of the heat conduction medium in the circumferential direction of the stator 30, and the multiple heat dissipation fins 42 located in the heat conduction cavity 400 are centrally symmetrically distributed around the axis of the rotating shaft 21.

[0029] In this way, the heat transfer oil in the heat transfer cavity 400 can exchange heat with the part of the heat dissipation fins 42 extending into the heat dissipation shell 40, and the heat is transferred to the heat dissipation fins 42 extending into the first cavity 101 and the second cavity 102, and then exchange heat with the air, thereby promoting the cooling of the heat transfer oil and further improving the cooling effect on the stator 30.

[0030] Furthermore, in order to reduce the noise generated by the air flow during circulation and the noise generated during the operation of the rotor 20 and the stator 30, a noise reduction patch 421 is attached to the surface wall of the heat dissipation fin 42. The thickness of the noise reduction patch 421 gradually increases from the air guide channel 410 to the front cover 50 or the rear cover 60, and guides the air flow in the air guide channel 410 to the front cover 50, and finally discharges it from the first vent 500.

[0031] In some embodiments, the noise reduction patch 421 is made of sound insulation sponge or sound insulation foam made of porous foaming materials such as polyurethane, environmentally friendly polyester fiber, foam rubber, etc., and its porous foaming material may also be added with thermal conductive fillers such as graphite, carbon black, and metal powder during preparation to form a thermal conductive network, thereby improving the thermal conductivity of the noise reduction patch 421, so that the noise reduction patch 421 not only has a good noise reduction effect, but also has a thermal conductive effect to a certain extent.

[0032] In a specific embodiment, a groove structure is provided on the surface of the noise reduction patch 421, and the groove structure can increase the contact area with the air and have a barrier effect on the transmission of sound waves, so that the sound waves are attenuated on the transmission path.

[0033] Furthermore, the heat sink 42 includes a solid or hollow fin structure. The heat sink 42 can be made of aluminum alloy material, and when the heat sink 42 is a hollow fin structure, a "U"-shaped loop for the circulation of heat transfer medium is provided in the heat sink 42. The heat sink 42 with the "U"-shaped loop can be made of copper tubes or aluminum alloy tubes bent into a "U"-shaped loop, and then a sheet is wrapped around the outside of the "U"-shaped copper tube or aluminum alloy tube to form the heat sink 42. The "U"-shaped loop can provide a circulation path for the heat transfer oil in the heat transfer cavity 400, thereby increasing the heat exchange area of ​​the heat transfer oil and achieving a better heat exchange effect.

[0034] In order to reduce the noise when the motor is working, a silencer 80 is fixedly provided on the inner wall of the front cover 50 and the rear cover 60. The silencer 80 includes one or more silencer rings distributed along the axial direction. Air guide holes are provided on the silencer rings corresponding to the first air vent 500 or the second air vent 600. The cross-sectional areas of the air guide holes are the same or different. When the cross-sectional areas of the air guide holes are different, the cross-sectional areas of the air guide holes are distributed from small to large or from large to small. A silencer patch 84 is fixedly provided on the surface of the silencer ring.

[0035] In some embodiments, the sound-absorbing patch 84 may be made of sound-absorbing sponge or sound-absorbing foam made of porous foam materials such as polyurethane, environmentally friendly polyester fiber, foam rubber, etc., and its porous foam material may also be added with thermal conductive fillers such as graphite, carbon black, and metal powder during preparation to form a thermal conductive network, thereby improving the thermal conductivity of the sound-absorbing patch 84. The sound-absorbing patch 84 not only has a good noise reduction effect, but also has a heat conductive effect to a certain extent. The air guide holes with different cross-sectional areas can play a good barrier role in the transmission path of sound waves without affecting the discharge of airflow.

[0036] In this way, silencers 80 are set on the inner sides of the front cover 50 and the rear cover 60. When the gas and sound waves flow or transmit in the direction of the vent, they will pass through multiple silencer patches 84 in advance. The silencer patches 84 rely on their own porous structure to block the transmission of sound waves, so that the sound waves are attenuated on the transmission path, thereby achieving the purpose of reducing noise. The heat dissipation fan 22, rotor 20 and stator 30 that generate noise are all built into the motor housing 10. In this way, under the action of the silencer 80, the noise transmitted to the outside of the motor will be further reduced, so that the sound generated by the motor when working will not affect the user experience.

[0037] Furthermore, the silencer 80 includes three silencer rings, the axes of the three silencer rings are parallel to the axis of the rotating shaft 21, and the three silencer rings are coaxially stacked, and silencer patches 84 are provided on the contact side or both sides of the silencer rings. Air guide holes are opened in the axial direction on the silencer rings, and the diameter of the air guide holes on the inner silencer ring is larger than the diameter of the air guide holes on the outer silencer ring.

[0038] like Figure 2 , Figure 3 , Figure 6 , Figure 8 , Fig. 9 and Fig.10 As shown, the silencer 80 includes three silencer rings, which include a first silencer ring 81, a second silencer ring 82 and a third silencer ring 83 distributed from the inside to the outside along the axial direction. The first silencer ring 81, the second silencer ring 82 and the third silencer ring 83 are respectively provided with a first air guide hole 810, a second air guide hole 820 and a third air guide hole 830. The first silencer ring 81, the second silencer ring 82 and the third silencer ring 83 are fixed with a silencer patch 84 on one side or both sides of the first silencer ring 81, the second silencer ring 82 and the third silencer ring 83. The diameter of the first air guide hole 810 is larger than the diameter of the second air guide hole 820 and the diameter of the third air guide hole 830 respectively.

[0039] In this way, when the airflow inside the motor outer shell 10 flows outward, it will pass through the first silencer ring 81, the second silencer ring 82 and the third silencer ring 83 in sequence, and be discharged from the gradually decreasing first air guide hole 810, the second air guide hole 820 and the third air guide hole 830. The sound waves therein will also pass through the first silencer ring 81, the second silencer ring 82 and the third silencer ring 83 and the silencer patch 84 in sequence, so that the sound is attenuated at multiple levels, thereby achieving the effect of noise reduction.

[0040] Furthermore, a connector 85 is installed between any two adjacent silencer rings. The connector 85 can be a temperature-sensitive memory metal sheet made of a two-way copper-based shape memory alloy or an iron-based shape memory alloy, and the two ends of the connector 85 are respectively connected to the two adjacent silencer rings. The connector 85 is configured to adjust the relative deflection angle between the two silencer rings at a set temperature.

[0041] In a specific embodiment, one end of the temperature-sensitive memory metal sheet is connected to the front silencer ring, and the other end is connected to the rear silencer ring, and the temperature-sensitive memory metal sheet is bent at room temperature. When the temperature rises to 50°C~60°C, the bent temperature-sensitive memory metal sheet gradually straightens, causing the angle between the two silencer rings to deflect.

[0042] Specifically, the relative position between the two silencer rings connected by the connecting member 85 includes a first position and a second position. When the two silencer rings are in the first position, the air guide holes on the two silencer rings are staggered in the circumferential direction. When the two silencer rings are in the second position, the air guide holes on the two silencer rings overlap or are coaxially distributed in the axial direction, and both correspond to the first air hole 500 or the second air hole 600. The connecting member 85 is configured to adjust the relative position between the silencer rings from the first position to the second position when the temperature inside the motor outer casing 10 rises to a set temperature of 50°C~60°C.

[0043] In this way, when the temperature inside the motor is relatively low, the air guide holes on the silencer ring are staggered in the circumferential direction, so that the transmission path of the sound waves is further blocked. At this time, the airflow needs to flow back and forth between the staggered air guide holes, and the air circulation path is relatively long. At this time, a better noise reduction effect can be achieved. However, when the temperature inside the motor is relatively high, the motor needs to be cooled down in time, and the silencer rings are deflected to each other until the air guide holes overlap or are coaxially distributed in the axial direction. In this way, the airflow can be discharged or enter the motor outer casing 10 more smoothly, accelerating the heat exchange between the air and the motor.

[0044] Since dust, hair and other impurities may accumulate in the operating environment of the treadmill, and the driving wheel 90 of the motor is usually on the outside, it is easy for the above impurities to enter the motor through the vents, affecting the internal heat dissipation.

[0045] like Figure 2 and Figure 3 As shown, in order to prevent impurities from entering the interior of the motor through the first air vent 500, a mounting seat 91 is provided inside the side of the driving wheel 90 facing the front end cover 50, a baffle 92 is slidably mounted on the mounting seat 91, a guide slide arm 921 is fixedly provided on the baffle 92, and the mounting seat 91 is provided with a slideway for the guide slide arm 921 to slide.

[0046] Among them, more than six symmetrically distributed baffles 92 are arranged with the axial direction of the rotating shaft 21 as the center, the angle between the baffle 92 and the guide slide arm 921 is set to 45°, and a spring or spring plate is installed in the slide to push the baffle 92 outward, and a sound insulation sponge or sound insulation foam made of porous foaming materials such as polyurethane, environmentally friendly polyester fiber, foam rubber, etc. is arranged on the side of the baffle 92 facing the front end cover 50 to further reduce the noise of the sound waves discharged from the first air vent 500, and a counterweight is installed on the other side of the baffle 92. When the driving wheel 90 rotates, under the action of centrifugal force, the baffle 92 moves to the side away from the rotating shaft 21, so that the guide slide arm 921 of the baffle 92 slides along the slide, so that the baffle 92 is away from the first air vent 500, so that the air flow path is open.

[0047] In a specific embodiment, the moving path of the baffle 92 along the guide slide arm 921 includes a third position and a fourth position, and when the baffle 92 is in the third position, the baffle 92 covers the outside of the first vent hole 500, and when the baffle 92 is in the fourth position, the baffle 92 covers the inner surface of the driving wheel 90, and a gap of more than 10 mm is provided between the driving wheel 90 and the front end cover 50. When the driving wheel 90 rotates, the baffle 92 moves from the third position to the fourth position, and when the driving wheel 90 stops, the baffle 92 moves from the fourth position to the third position.

[0048] In this way, when the motor is working, the baffle 92 is opened by the rotation of the driving wheel 90, so that the first air vent 500 is exposed, and the normal flow of air is not hindered. Since the air flow flows outward at this time, impurities will not enter the motor. When the treadmill is turned off, the driving wheel 90 stops rotating. At this time, the baffle 92 covers the surface of the first air vent 500 to prevent external impurities from entering the interior of the motor, thereby playing a protective role.

[0049] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A motor structure, characterized in that: include: A motor outer shell (10), wherein a stator (30) is fixedly disposed inside the motor outer shell (10), a rotatable rotor (20) is disposed inside the stator (30), and a rotating shaft (21) is fixed at the axial center position of the rotor (20); A front end cover (50) is provided at the front end of the motor outer shell (10), and a first vent hole (500) is provided on the front end cover (50); A rear end cover (60) is provided at the rear end of the motor outer shell (10), and a second vent hole (600) is provided on the rear end cover (60); The front end of the rotating shaft (21) passes through the front end cover (50) and is connected to a driving wheel (90); A first cavity (101) is provided between the stator (30) and the front end cover (50), a second cavity (102) is provided between the stator (30) and the rear end cover (60), a heat dissipation fan (22) is provided on the rotating shaft (21) corresponding to the first cavity (101), a heat dissipation shell (40) is provided between the peripheral side of the stator (30) and the motor outer shell (10), and when the motor is running, heat generated by the rotor (20) and the stator (30) is conducted to the heat dissipation shell (40); A plurality of groups of air guide pipes (41) are provided inside the heat dissipation shell (40), and the air guide pipes (41) have an air guide channel (410) connecting the first cavity (101) and the second cavity (102); When the rotor (20) rotates, it drives the heat dissipation fan (22) to rotate, so that external air enters the second cavity (102), passes through the air guide channel (410) into the first cavity (101), and is then discharged through the first vent hole (500).

2. A motor structure according to claim 1, characterized in that: The heat dissipation shell (40) comprises a rectangular shell and an annular shell located inside the rectangular shell, the four groups of air ducts (41) are respectively arranged inside the four corners of the rectangular shell, a closed heat conduction cavity (400) is provided between the air duct (41) and the rectangular shell and the annular shell, and a heat conduction medium is provided inside the heat conduction cavity (400); The front end and the rear end of the heat dissipation shell (40) are respectively provided with heat dissipation fins (42); the heat dissipation fins (42) at the front end of the heat dissipation shell (40) extend into the first cavity (101), and the heat dissipation fins (42) at the rear end of the heat dissipation shell (40) extend into the second cavity (102).

3. A motor structure according to claim 2, characterized in that: The heat dissipation fins (42) at the front end and the rear end of the heat dissipation shell (40) are respectively provided in plurality, and the heat dissipation fins (42) at each end are respectively arranged at intervals around the stator (30), and a heat dissipation channel (420) is provided between any two adjacent heat dissipation fins (42).

4. A motor structure according to claim 2, characterized in that: The heat dissipation fin (42) partially extends into the interior of the heat conduction cavity (400), and the length of the portion of the heat dissipation fin (42) located in the heat conduction cavity (400) is smaller than the length of the heat conduction cavity (400), so that the heat conduction cavity (400) has a continuous channel for the heat conduction medium to flow in the circumferential direction of the stator (30), and the plurality of heat dissipation fins (42) located in the portion of the heat conduction cavity (400) are centrally symmetrically distributed around the axis of the rotating shaft (21).

5. The motor structure according to claim 2, characterized in that: A noise reduction patch (421) is attached to the surface wall of the heat dissipation fin (42), and a groove structure is provided on the surface of the noise reduction patch (421).

6. A motor structure according to claim 2, characterized in that: The heat dissipation fins (42) include a solid or hollow fin structure.

7. The motor structure according to claim 1, characterized in that: A silencer (80) is fixedly provided on the inner side walls of the front end cover (50) and the rear end cover (60), respectively, the silencer (80) comprising three silencer rings, the axes of the three silencer rings being parallel to the axis of the rotating shaft (21), and the three silencer rings being coaxially stacked; A sound-absorbing patch (84) is provided on the contact side or both sides of the sound-absorbing ring; The silencer ring is provided with air guide holes along the axial direction, and the diameter of the air guide holes on the inner silencer ring is larger than the diameter of the air guide holes on the outer silencer ring.

8. A motor structure according to claim 7, characterized in that: A connecting piece (85) is installed between any two adjacent silencer rings, the connecting piece (85) comprises a temperature-sensitive memory metal sheet, and both ends of the connecting piece (85) are respectively connected to the two adjacent silencer rings, and the connecting piece (85) is configured to adjust the relative deflection angle between the two silencer rings at a set temperature.

9. A motor structure according to claim 8, characterized in that: The relative position between the two silencer rings connected by the connecting member (85) includes a first position and a second position. When the two silencer rings are in the first position, the air guide holes on the two silencer rings are staggered in the circumferential direction. When the two silencer rings are in the second position, the air guide holes on the two silencer rings overlap or are coaxially distributed in the axial direction and both correspond to the first air hole (500) or the second air hole (600). The connecting member (85) is configured to adjust the relative position between the silencer rings from the first position to the second position when the temperature inside the motor outer casing (10) rises to a set temperature.

10. The motor structure according to claim 1, characterized in that: A mounting seat (91) is provided inside a side of the driving wheel (90) facing the front end cover (50), a baffle (92) is slidably mounted on the mounting seat (91), a guide slide arm (921) is fixedly mounted on the baffle plate (92), and the mounting seat (91) is provided with a slideway for the guide slide arm (921) to slide; The baffle (92) includes a third position and a fourth position along the movable path of the guide sliding arm (921), and when the baffle (92) is in the third position, the baffle (92) covers the outside of the first vent hole (500), and when the baffle (92) is in the fourth position, the baffle (92) covers the inner surface of the driving wheel (90), and a gap of more than 10 mm is provided between the driving wheel (90) and the front end cover (50), and when the driving wheel (90) rotates, the baffle (92) moves from the third position to the fourth position, and when the driving wheel (90) stops, the baffle (92) moves from the fourth position to the third position.

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