A motor structure

Abstract

The present invention provides a motor structure, which includes a motor housing. A heat dissipation shell is fixedly arranged between the motor housing and the stator. A plurality of air ducts are arranged inside the heat dissipation shell. The inner side of the air duct has an air guide channel communicating the first cavity and the second cavity. Silencers are fixedly arranged on the inner side walls of the front end cover and the rear end cover. The heat dissipation shell strengthens the heat dissipation capacity of the stator and the rotor through the heat-conducting oil inside it. An air guide channel and heat dissipation fins are arranged inside the heat dissipation shell, which can increase the air circulation area on both sides of the stator and the rotor, so as to achieve a better heat exchange effect. The noise reduction patches on the heat dissipation fins and the silencers on the inner side walls of the end covers not only have a good noise reduction effect, but also play a heat conduction role to a certain extent. The air guide holes with different cross-sectional areas can play a good blocking role on the sound wave transmission path and do not affect the discharge of air flow at the same time.

Description

Technical Field

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

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

[0003] During the use of a treadmill motor, there are mainly problems of heat generation and noise. Currently, the heat dissipation of the motor mainly relies on the cooling fan installed at the end of the motor shaft to extract the hot air inside the motor for heat dissipation. Since the air flow speed inside the motor housing is limited, the heat dissipation effect of this method is not good. As the temperature of the motor rises, the components inside the motor expand and contract due to heat, generating greater friction and vibration, and thus generating greater noise. And the noise control of the treadmill motor is crucial for 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, including:

[0005] A motor housing, inside which a stator is fixedly arranged, a rotatable rotor is arranged inside the stator, and a rotating shaft is fixed at the axial center position of the rotor;

[0006] A front end cover is arranged at the front end of the motor housing, and a first ventilation hole is opened on the front end cover;

[0007] A rear end cover is arranged at the rear end of the motor housing, and a second ventilation hole is opened on the rear end cover;

[0008] The front end of the rotating shaft passes through the front end cover and is connected to a driving wheel;

[0009] Wherein, a first cavity is arranged between the stator and the front end cover, a second cavity is arranged between the stator and the rear end cover, a cooling fan is arranged on the rotating shaft corresponding to the first cavity, and a heat dissipation shell is arranged between the circumferential side of the stator and the motor housing. When the motor operates, the heat generated by the rotor and the stator is conducted to the heat dissipation shell;

[0010] 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;

[0011] When the rotor rotates, it drives the cooling fan to rotate, allowing external air to enter the second cavity, pass through the air guide channel into the first cavity, and then be discharged through the first ventilation holes.

[0012] Preferably, the heat dissipation shell includes a rectangular shell and an annular shell located inside the rectangular shell. Four groups of the air guide pipes are respectively arranged at the inner sides of the four corners of the rectangular shell. There is a closed heat conduction cavity between the air guide pipes and the rectangular shell and the annular shell, and a heat conduction medium is provided inside the heat conduction cavity;

[0013] Heat dissipation fins are respectively provided at the front end and the rear end of the heat dissipation shell. 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.

[0014] Preferably, the number of the heat dissipation fins at the front end and the rear end of the heat dissipation shell are respectively multiple, and the heat dissipation fins at each end are respectively arranged at intervals around the stator. There is a heat dissipation channel between any two adjacent heat dissipation fins.

[0015] Preferably, a part of the heat dissipation fins extends into the interior of the heat conduction cavity, and the length of the part of the heat dissipation fins located inside the heat conduction cavity is less 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. A plurality of the heat dissipation fins located inside the heat conduction cavity are symmetrically distributed around the axis of the rotating shaft.

[0016] Preferably, a noise reduction patch is attached to the surface wall of the heat dissipation fins, and a groove structure is provided on the surface of the noise reduction patch.

[0017] Preferably, the heat dissipation fins include a solid or hollow fin structure.

[0018] Preferably, silencers are respectively fixedly provided on the inner side walls of the front end cover and the rear end cover. The silencer includes three sound absorption rings. The axes of the three sound absorption rings are parallel to the axis of the rotating shaft, and the three sound absorption rings are stacked coaxially;

[0019] A sound absorption patch is provided on the contact side, or both sides, of the sound absorption ring;

[0020] An air guide hole is axially provided on the sound absorption ring, and the diameter of the air guide hole on the inner sound absorption ring is larger than the diameter of the air guide hole on the outer sound absorption ring.

[0021] Preferably, a connecting member is installed between any two adjacent sound-absorbing rings. The connecting member includes a temperature-sensitive shape memory metal sheet, and both ends of the connecting member are respectively connected to the adjacent two sound-absorbing rings. The connecting member is configured to adjust the relative deflection angle between the two sound-absorbing rings at a set temperature.

[0022] Preferably, the relative positions between the two sound-absorbing rings connected by the connecting member include a first position and a second position. When the two sound-absorbing rings are in the first position, the air guide holes on the two sound-absorbing rings are misaligned in the circumferential direction. When the two sound-absorbing rings are in the second position, the air guide holes on the two sound-absorbing rings coincide or are coaxially distributed in the axial direction and correspond to the first air vent or the second air vent. The connecting member is configured to adjust the relative position between the sound-absorbing rings from the first position to the second position when the temperature in the motor housing rises to the set temperature.

[0023] Preferably, an installation seat is provided inside one side of the driving wheel facing the front end cover. A baffle is slidably installed on the installation seat. A guiding sliding arm is fixedly provided on the baffle, and the installation seat is provided with a sliding track for the guiding sliding arm to slide.

[0024] The movement path of the baffle along the guiding sliding arm includes a third position and a fourth position. When the baffle is in the third position, the baffle covers the outside of the first air vent. When the baffle is in the fourth position, the baffle covers the inner surface of the driving wheel. There is a gap of more than 10 mm between the driving wheel and the front end cover. When the driving wheel rotates, the baffle moves from the third position to the fourth position. When the driving wheel stops, the baffle moves from the fourth position to the third position.

[0025] Compared with the prior art, the advantages of the present invention are as follows:

[0026] In the present invention, a heat dissipation shell is installed corresponding to the stator inside the motor housing. The heat dissipation shell enhances the heat dissipation capacity of the stator through the heat-conducting oil inside it. At the same time, a gas guide channel is arranged inside 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 on both sides of the stator and the rotor, further increasing the contact area between the air and the stator, the heat dissipation shell, and the motor housing, so as to achieve a better heat exchange effect.

[0027] In the present invention, noise reduction patches are arranged on the heat dissipation fins, and silencers are fixedly provided on the inner side walls of the front end cover and the rear end cover, which not only have a good noise reduction effect but also play a heat conduction effect to a certain extent. The air guide holes with different cross-sectional areas can play a good blocking role in the sound wave transmission path and do not affect the discharge of air flow at the same time. Description of the Drawings

[0028] The accompanying drawings are not intended to be drawn to scale. In the accompanying drawings, each identical or nearly identical component shown in each figure may be denoted by the same reference numeral. For the sake of clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the present invention will be described by way of example and with reference to the accompanying drawings, wherein:

[0029] Figure 1 is a perspective structural view of a motor structure shown in an embodiment of the present invention;

[0030] Figure 2 is an internal structural view of a motor structure shown in an embodiment of the present invention;

[0031] Figure 3 is an internal structural view of a diagonal corner of a motor structure shown in an embodiment of the present invention;

[0032] Figure 4 is Figure 2 a sectional structural view taken along the A-A direction in;

[0033] Figure 5 is Figure 2 a sectional structural view taken along the B-B direction in;

[0034] Figure 6 is Figure 2 a sectional structural view taken along the C-C direction in;

[0035] Figure 7 is a structural view of a heat dissipation fin shown in an embodiment of the present invention;

[0036] Figure 8 is a structural view of a silencer shown in an embodiment of the present invention;

[0037] Figure 9 is a disassembled structural view of a silencer shown in an embodiment of the present invention;

[0038] Figure 10 is a side view structural view of a silencer shown in an embodiment of the present invention;

[0039] 10. Motor housing; 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 end cover; 500. First ventilation hole; 60. Rear end cover; 600. Second ventilation hole; 70. Bearing; 80. Silencer; 81. First silencing ring; 810. First air guide hole; 82. Second silencing ring; 820. Second air guide hole; 83. Third silencing ring; 830. Third air guide hole; 84. Noise reduction patch; 85. Connecting piece; 90. Driving wheel; 91. Mounting seat; 92. Baffle; 921. Guide sliding arm. Detailed implementation manners

[0040] To better understand the technical content of the present invention, specific embodiments are hereby given and described in conjunction with the accompanying drawings as follows.

[0041] The heat dissipation performance of the motor is crucial for 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 design of the air flow passage inside the motor is crucial for the heat dissipation and noise control of the motor. Through a reasonable ventilation structure and air flow passage design, it can ensure that the motor maintains a low temperature and noise level while operating efficiently. For a treadmill motor, the low noise of the motor is particularly important for the user experience. Therefore, the present invention proposes a motor structure aiming to improve the heat dissipation ability 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 end cover 50, a rear end cover 60, etc.

[0042] As Figure 1 and Figure 2 shown, the stator 30 is fixedly arranged inside the motor housing 10, and the rotor 20 is rotatably installed inside the stator 30. The rotating shaft 21 is fixedly arranged at the axial center position of the rotor 20. The front end cover 50 is fixedly installed at the front end of the motor housing 10 by installing screws at the four corners, and the rear end cover 60 is fixedly installed at the rear end of the motor housing 10 by installing screws at the four corners. Two bearings 70 are respectively installed at the connection positions of the rotating shaft 21 with the front end cover 50 and the rear end cover 60. The driving wheel 90 is fixedly installed at the front end of the rotating shaft 21 and can drive the belt on the treadmill to rotate. Among them, the motor can adopt a brushed motor or a brushless motor. When a brushed motor is adopted, a carbon brush and a commutator cooperating with the carbon brush are installed on the rotating shaft 21. When a brushless motor is adopted, a magnetic ring 23 and a magnetoelectric sensor 24 cooperating with the magnetic ring 23 are installed on the rotating shaft 21. Multiple magnetic poles of the magnetic ring 23 are induced with the magnetoelectric sensor 24 (Hall sensor) to test the rotation speed and efficiency of the motor, and the operation of the motor can be controlled according to the signal provided by the magnetic ring 23.

[0043] Furthermore, a first ventilation hole 500 is formed in the front end cover 50, and a second ventilation hole 600 is formed in the rear end cover 60. Inside the motor housing 10, a first cavity 101 is arranged along the axial direction of the rotating shaft 21 corresponding to the front side of the stator 30, and a second cavity 102 is arranged 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 of the rotating shaft 21 corresponding to the second cavity 102 to enhance the air supply capacity.

[0044] In some embodiments, a plurality of first ventilation holes 500 are arranged on the front end cover 50 in a centrosymmetric distribution centered on the rotating shaft 21. Correspondingly, a plurality of second ventilation holes 600 are arranged on the rear end cover 60 in a centrosymmetric distribution centered on the rotating shaft 21. The cooling fan 22 installed in the first cavity 101 on the rotating shaft 21 is used to conduct the heat generated during the operation of the rotor 20 and the stator 30 out of the motor housing 10 from the first cavity 101, and then suck the external cold air into the second cavity 102. The cold air entering the second cavity 102 enters the first cavity 101 after passing through the rotor 20 and the stator 30, so that heat exchange is formed between the cold air and the rotor 20 and the stator 30, and the rotor 20 and the stator 30 are cooled. Moreover, 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 air guiding directions of the two cooling fans 22 are the same, which can accelerate the flow rate of the air flow.

[0045] In this way, the front end cover 50 is provided with the first ventilation hole 500, and the rear end cover 60 is provided with the second ventilation hole 600, so that the external air can pass through the inside of the motor housing 10, promoting heat exchange between the external cold air and the rotor 20 and the stator 30 inside the motor housing 10 and improving the heat dissipation efficiency.

[0046] Furthermore, a heat dissipation shell 40 is fixedly arranged between the stator 30 and the motor housing 10. Inside the heat dissipation shell 40, a plurality of air guide pipes 41 are arranged, and an air guide channel 410 communicating the first cavity 101 and the second cavity 102 is formed inside the air guide pipe 41.

[0047] In some embodiments, the air guide channels 410 are distributed in a centrosymmetric manner around the axis of the rotating shaft 21. Taking the example that the cooling fan 22 guides the air in the second cavity 102 into the first cavity 101 during operation, the arrangement of the plurality of air guide channels 410 can accelerate the flow of the air in the second cavity 102 into the first cavity 101, and the air guide channels 410 are distributed in a centrosymmetric manner, so that the air can flow evenly, making the cooling effects of all regions of the stator 30 approximately the same.

[0048] In a specific embodiment, such asFigure 4 , Figure 5 and Figure 6 As shown in Figure 4 , Figure 5 , and Figure 6 , the cross-section of the motor housing 10 adopts a rectangular structure, and there is a certain space between the four corners thereof and the outer side of the stator 30. Four groups of air ducts 41 are provided, respectively, inside the four corners of the motor housing 10.

[0049] As Figure 2 , Figure 3 and Figure 7 As shown in Figure 2 , Figure 3 , and Figure 7 , the heat dissipation housing 40 includes a rectangular housing and an annular housing located inside the rectangular housing. Four groups of air ducts 41 are respectively provided inside the four corners of the rectangular housing. There is a closed heat conduction cavity 400 between the air ducts 41 and the rectangular housing and the annular housing. A heat conduction medium is provided inside the heat conduction cavity 400, and the heat conduction medium can adopt heat conduction oil. Heat dissipation fins 42 are respectively provided at the front end and the rear end of the heat dissipation housing 40. The heat dissipation fins 42 at the front end of the heat dissipation housing 40 extend into the first cavity 101, and the heat dissipation fins 42 at the rear end of the heat dissipation housing 40 extend into the second cavity 102. The number of heat dissipation fins 42 at the front end and the rear end of the heat dissipation housing 40 are respectively multiple, and the heat dissipation fins 42 at each end are respectively arranged at intervals around the stator 30. There is a heat dissipation channel 420 between any two adjacent heat dissipation fins 42.

[0050] The heat conduction oil inside the heat dissipation housing 40 can contact and dissipate heat from the outer shell of the stator 30, absorb the heat generated when the stator 30 works into the heat conduction oil. When the air flow passes through the air duct 41, heat exchange is carried out between the heat conduction oil and the air, realizing the cooling of the stator 30 and the heat conduction oil. In this way, the heat dissipation ability of the motor for the stator 30 can be enhanced. At the same time, multiple groups of heat dissipation fins 42 are provided. When the air flowing through 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 housing 40, and the motor housing 10 is further increased, thereby achieving a better heat exchange effect.

[0051] As Figure 4 , Figure 5 and Figure 6 As shown in Figure 4 , Figure 5 , and Figure 6 , further, in order to enhance the heat dissipation ability, part of the heat dissipation fins 42 extends into the interior of the heat conduction cavity 400, and the length of the heat dissipation fins 42 located inside 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 heat conduction medium to flow in the circumferential direction of the stator 30. The multiple heat dissipation fins 42 located inside the heat conduction cavity 400 are symmetrically distributed around the axis of the rotating shaft 21.

[0052] In this way, the heat-conducting oil in the heat-conducting cavity 400 can contact and exchange heat with the part of the heat-dissipating fins 42 extending into the heat-dissipating housing 40. The heat is transferred to the heat-dissipating fins 42 extending into the first cavity 101 and the second cavity 102, and then exchanges heat with the air, thereby promoting the cooling of the heat-conducting oil and further improving the cooling effect on the stator 30.

[0053] Furthermore, in order to reduce the noise generated during the flow of the air flow and the noise 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-dissipating fins 42. The thickness of the noise reduction patch 421 gradually increases in the direction from the air guide channel 410 to the front end cover 50 or the rear end cover 60, and guides the air flow in the air guide channel 410 to the front end cover 50 and finally discharges it from the first ventilation hole 500.

[0054] In some embodiments, the noise reduction patch 421 is made of a sound-insulating sponge or sound-insulating foam made of porous foaming materials such as polyurethane, environmentally friendly polyester fiber, and foam rubber. When preparing the porous foaming materials, heat-conducting fillers such as graphite, carbon black, and metal powder can also be added to form a heat-conducting network, thereby improving the heat-conducting performance of the noise reduction patch 421, so that the noise reduction patch 421 not only has a good noise reduction effect but also plays a heat-conducting role to a certain extent.

[0055] In a specific embodiment, the surface of the noise reduction patch 421 is provided with a groove structure, which can increase the contact area with the air and play a blocking effect on the transmission of sound waves, so that the sound waves attenuate on the transmission path.

[0056] Further, the heat-dissipating fins 42 include a solid or hollow fin structure. The heat-dissipating fins 42 can be made of aluminum alloy material. When the heat-dissipating fins 42 are of a hollow fin structure, a "U"-shaped circuit for the heat-conducting medium to flow through is provided inside the heat-dissipating fins 42. The heat-dissipating fins 42 with the "U"-shaped circuit can be formed by bending a copper pipe or an aluminum alloy pipe into a "U"-shaped structure, and then covering a sheet material on the outside of the "U"-shaped copper pipe or aluminum alloy pipe to form the heat-dissipating fins 42. The "U"-shaped circuit can provide a flow path for the heat-conducting oil in the heat-conducting cavity 400, increasing the heat exchange area of the heat-conducting oil and achieving a better heat exchange effect.

[0057] In order to reduce the noise during the operation of the motor, silencers 80 are fixedly provided on the inner side walls of the front end cover 50 and the rear end cover 60. The silencers 80 include more than one sound absorption ring distributed along the axial direction. Air guide holes are provided on the sound absorption ring corresponding to the first ventilation hole 500 or the second ventilation hole 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. Sound absorption patches 84 are fixedly provided on the surface of the sound absorption ring.

[0058] In some embodiments, the sound-absorbing patch 84 can be made of sound-insulating sponge or sound-insulating foam made of porous foaming materials such as polyurethane, environmentally friendly polyester fiber, and foam rubber. When preparing the porous foaming materials, heat-conducting fillers such as graphite, carbon black, and metal powder can be added to form a heat-conducting network, thereby improving the heat-conducting performance of the sound-absorbing patch 84. The sound-absorbing patch 84 not only has a good noise reduction effect but also plays a heat-conducting role to a certain extent. The vent holes with different cross-sectional areas can play a good blocking role on the sound wave transmission path while not affecting the discharge of air flow.

[0059] Thus, mufflers 80 are provided on the inner sides of the front end cover 50 and the rear end cover 60. When the gas and sound waves flow or are transmitted towards the vent holes, they will pass through multiple sound-absorbing patches 84 in advance. Relying on its own porous structure, the sound-absorbing patch 84 can block the transmission of sound waves, attenuate the sound waves on the transmission path, and achieve the purpose of reducing noise. Moreover, the heat dissipation fan 22, the rotor 20, and the stator 30 that generate noise are all built inside the motor housing 10. Thus, under the action of the muffler 80, the noise transmitted outside the motor will be further reduced, so that the sound generated by the motor during operation will not affect the user experience.

[0060] Furthermore, the muffler 80 includes three sound-absorbing rings. The axes of the three sound-absorbing rings are parallel to the axis of the rotating shaft 21, and the three sound-absorbing rings are coaxially stacked. The contact side or both sides of the sound-absorbing rings are provided with sound-absorbing patches 84. Vent holes are axially formed on the sound-absorbing rings, and the diameter of the vent holes on the inner sound-absorbing ring is larger than the diameter of the vent holes on the outer sound-absorbing ring.

[0061] As Figure 2 、 Figure 3 、 Figure 6 、 Figure 8 、 Figure 9 and Figure 10 shown, the muffler 80 includes three sound-absorbing rings. The three sound-absorbing rings include a first sound-absorbing ring 81, a second sound-absorbing ring 82, and a third sound-absorbing ring 83 that are distributed from the inside to the outside along the axial direction. First vent holes 810, second vent holes 820, and third vent holes 830 are respectively formed on the first sound-absorbing ring 81, the second sound-absorbing ring 82, and the third sound-absorbing ring 83. The sound-absorbing patches 84 are fixedly provided on one side or both sides of the first sound-absorbing ring 81, the second sound-absorbing ring 82, and the third sound-absorbing ring 83. The diameter of the first vent holes 810 is successively larger than the diameter of the second vent holes 820 and the diameter of the third vent holes 830.

[0062] Thus, when the airflow inside the motor housing 10 flows outward, it will successively pass through the first sound-absorbing ring 81, the second sound-absorbing ring 82, and the third sound-absorbing ring 83, and be discharged from the gradually decreasing first air guide hole 810, second air guide hole 820, and third air guide hole 830. The sound waves therein will also successively pass through the first sound-absorbing ring 81, the second sound-absorbing ring 82, the third sound-absorbing ring 83, and the sound-absorbing patch 84, causing the sound to be attenuated in multiple stages and achieving the effect of noise reduction.

[0063] Furthermore, a connecting member 85 is installed between any two adjacent sound-absorbing rings. The connecting member 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. The two ends of the connecting member 85 are respectively connected to the adjacent two sound-absorbing rings. The connecting member 85 is configured to adjust the relative deflection angle between the two sound-absorbing rings at a set temperature.

[0064] In a specific embodiment, one end of the temperature-sensitive memory metal sheet is connected to the front sound-absorbing ring, and the other end is connected to the rear sound-absorbing ring. 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 sound-absorbing rings to deflect.

[0065] Specifically, the relative positions between the two sound-absorbing rings connected by the connecting member 85 include a first position and a second position. When the two sound-absorbing rings are in the first position, the air guide holes on the two sound-absorbing rings are misaligned in the circumferential direction. When the two sound-absorbing rings are in the second position, the air guide holes on the two sound-absorbing rings coincide or are coaxially distributed in the axial direction and both correspond to the first ventilation hole 500 or the second ventilation hole 600. The connecting member 85 is configured to adjust the relative position between the sound-absorbing rings from the first position to the second position when the temperature inside the motor housing 10 rises to 50°C - 60°C of the set temperature.

[0066] Thus, when the temperature inside the motor is relatively low, the air guide holes on the sound-absorbing rings are misaligned in the circumferential direction, further blocking the transmission path of the sound waves. 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, achieving a better noise reduction effect at this time. When the temperature inside the motor is relatively high, it is necessary to cool the motor in time. The sound-absorbing rings deflect relative to each other until the air guide holes coincide or are coaxially distributed in the axial direction. In this way, the airflow can be discharged or enter the motor housing 10 more smoothly, accelerating the heat exchange between the air and the motor.

[0067] Since there will be accumulations of impurities such as dust and hair in the usage environment of the treadmill, and the driving wheel 90 side of the motor is usually on the outside, it is easy for the above impurities to enter the motor through the ventilation holes, affecting the internal heat dissipation.

[0068] Such as Figure 2 and Figure 3As shown in the figure, in order to prevent impurities from entering the interior of the motor through the first ventilation hole 500, an installation seat 91 is provided inside one side of the driving wheel 90 facing the front end cover 50. A baffle 92 is slidably mounted on the installation seat 91. A guiding slide arm 921 is fixedly provided on the baffle 92, and the installation seat 91 is provided with a slideway for the guiding slide arm 921 to slide.

[0069] Among them, more than six symmetrically distributed baffles 92 are arranged centered on the axial direction of the rotating shaft 21. The included angle between the baffle 92 and the guiding slide arm 921 is set to 45°. And a spring or elastic sheet for pushing the baffle 92 outwards is installed in the slideway. On the side of the baffle 92 facing the front end cover 50, a sound insulation sponge or sound insulation foam made of porous foaming materials such as polyurethane, environmentally friendly polyester fiber, and foam rubber is provided to further reduce the noise of the sound waves discharged from the first ventilation hole 500. 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 towards the side away from the rotating shaft 21, so that the guiding slide arm 921 of the baffle 92 slides along the slideway, making the baffle 92 away from the first ventilation hole 500 and opening the air flow passage.

[0070] In a specific embodiment, the moving path of the baffle 92 along the guiding 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 ventilation hole 500. When the baffle 92 is in the fourth position, the baffle 92 covers the inner surface of the driving wheel 90. There is a gap of more than 10 mm 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. When the driving wheel 90 stops, the baffle 92 moves from the fourth position to the third position.

[0071] In this way, when the motor is working, by the rotation of the driving wheel 90, the baffle 92 is opened, exposing the first ventilation hole 500, without hindering the normal flow of air. Since the air flows outwards at this time, impurities will not enter the motor. When the treadmill is shut down, the driving wheel 90 stops rotating. At this time, the baffle 92 covers the surface of the first ventilation hole 500, preventing external impurities from entering the interior of the motor and playing a protective role.

[0072] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains can 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 subject to what is defined by 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), enters the first cavity (101), and is then discharged through the first vent hole (500); The front end and the rear end of the heat dissipation shell (40) are respectively provided with heat dissipation fins (42), and a heat dissipation channel (420) is provided between any two adjacent 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). A noise reduction patch (421) is attached to the surface wall of the heat dissipation fin (42), and the thickness of the noise reduction patch (421) gradually increases from the air guide channel (410) to the front end cover (50) or the rear end cover (60). The front end cover (50) is provided with a heat dissipation patch (421). 0) and the inner side walls of the rear end cover (60), respectively, a silencer (80) is fixedly provided, the silencer (80) comprising three silencer rings, silencer patches (84) are provided on both sides of the silencer rings, air guide holes are provided on the silencer rings, a connecting piece (85) is installed between any two adjacent silencer rings, the connecting piece (85) comprises a temperature-sensitive memory metal sheet, the connecting piece (85) is configured to adjust the relative deflection angle between the two silencer rings at a set temperature, when the temperature inside the motor outer shell (10) rises to the set temperature, the positions of the air guide holes on the silencer rings are deflected from the circumferentially offset distribution to the axially overlapping distribution.

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 ducts (41) and the rectangular shell and the annular shell, and a heat conduction medium is provided inside the heat conduction cavity (400).

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).

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: The surface of the noise reduction patch (421) is provided with a groove structure.

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: 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 the diameter of the air guide hole on the inner silencer ring is greater than the diameter of the air guide hole on the outer silencer ring.

8. A motor structure according to claim 7, characterized in that: Both ends of the connecting member (85) are respectively connected to two adjacent silencer rings.

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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