Treadmill inner rotating brushless motor

Abstract

The application relates to an inner-rotation brushless motor for a treadmill, and particularly relates to the technical field of motors for treadmills. A driving shaft is arranged through the center of a motor shell, the driving shaft is connected with the motor shell through a ball bearing, both sides of the middle part of the driving shaft are provided with rotor iron cores, the middle parts of the two groups of rotor iron cores are provided with permanent magnets, the inner wall of the motor shell is connected with a stator assembly, the back of the stator assembly is provided with a tunnel magnetic resistance element, the outer wall of one side of the rotor iron core is fixedly connected with a multi-pole magnetic coding ring, one side of the tunnel magnetic resistance element is provided with a micro-electro-mechanical inertial measurement unit, the micro-electro-mechanical inertial measurement unit comprises an accelerometer and a gyroscope. The application generates space magnetic field variation through the multi-pole magnetic coding ring fixed to the rotor side, the circumferentially-arranged tunnel magnetic resistance element array captures magnetic field signals in real time, the detection error caused by mechanical vibration is eliminated through Kalman filtering algorithm and magnetic position signal fusion.

Description

Technical Field

[0001] This application relates to the field of motor technology for treadmills, and in particular to internal rotary brushless motors for treadmills. Background Technology

[0002] Treadmill motors need to handle different exercise modes, such as walking, running, and interval running. These modes require the motor to operate at different speeds and loads. To ensure a smooth transition between these modes and prevent unexpected shutdowns or insufficient power, precise speed and position feedback is required for the treadmill motor to improve control accuracy.

[0003] In the prior art, for information related to motors used in treadmills, please refer to Chinese Patent Publication No. CN117595581A, which discloses a segmented internal rotary brushless motor, including a housing, segmented coil frames, coils, segmented magnetic cores, and a rotor. Heat-conducting pipes are provided inside the housing and between adjacent segmented coil frames. Insertion holes are provided at one end of the housing, corresponding to the positions of the multiple heat-conducting pipes. One end of each heat-conducting pipe passes through the interior of its corresponding insertion hole and extends to the exterior of the housing. A common mounting ring is fixed to one end of each heat-conducting pipe. Multiple evenly distributed mounting plates are fixed to the side wall of the mounting ring, and bolts are threaded onto the mounting plates to the end of the housing. This segmented internal rotary brushless motor, with multiple heat-conducting pipes inside the motor housing, can conduct heat from inside the housing outwards, rapidly reducing the internal temperature of the housing and preventing damage due to overheating, thus extending the motor's lifespan.

[0004] In the process of developing this application, the inventors discovered the following problems with the prior art:

[0005] In existing technologies, encoders and Hall sensors are used to sample the rotation state of the motor, which has been successfully applied in treadmills. However, traditional encoders have wear and maintenance issues due to their contact design with the motor shaft, and Hall sensors are prone to inaccurate sampling due to insufficient resolution. This can lead to inaccurate motor rotation control, unstable start-stop, and thus affect the operation of the running belt, resulting in poor foot feel for the user and limiting their use in treadmill applications. Summary of the Invention

[0006] The purpose of this application is to provide an internal rotation brushless motor for treadmills.

[0007] Firstly, the internal rotary brushless motor for treadmills provided in this application adopts the following technical solution:

[0008] A brushless motor for treadmills includes a motor housing with a drive shaft running through its center. The drive shaft is connected to the motor housing via ball bearings. Rotor cores are located on both sides of the middle of the drive shaft, and permanent magnets are located in the middle of the two sets of rotor cores. A stator assembly is connected to the inner wall of the motor housing, and a tunneling magnetoresistive element is located on the back of the stator assembly. A multi-pole magnetic encoder ring is fixedly connected to one side of the outer wall of the rotor core. Multiple sets of tunneling magnetoresistive elements are arranged at equal intervals and matched with the multi-pole magnetic encoder rings. A microelectromechanical inertial measurement unit (MEMS) is located on one side of each tunneling magnetoresistive element, and the MEMS includes an accelerometer and a gyroscope.

[0009] By adopting the above technical solution, when the drive shaft drives the rotor core to rotate, the multi-pole magnetic encoder ring fixed on the rotor side generates a change in the spatial magnetic field. The circumferentially arranged tunnel magnetoresistive element array captures the magnetic field signal in real time. The rotor angular position is analyzed by the change in magnetoresistive resistance. Simultaneously, the microelectromechanical inertial measurement unit detects the three-dimensional vibration and angular velocity of the motor. The Kalman filter algorithm is used to fuse with the magnetic position signal to eliminate the detection error caused by mechanical vibration. This process continuously outputs high-precision position data to the receiving control module to achieve sensorless FOC control. Essentially, it constructs a closed-loop sensing system with high static precision and high dynamic reliability. It solves the limitations of the pure magnetic encoding scheme in extreme dynamic scenarios and provides a near-ideal position feedback signal for high-dynamic servo systems.

[0010] The stator assembly includes a stator support ring, a limiting slot, stator teeth, and a stator winding. The inner wall of the stator support ring is provided with limiting slots, and stator teeth are embedded inside the multiple sets of limiting slots. The outer wall of the stator teeth is wound with stator windings.

[0011] By adopting the above technical solution, the current input to the stator winding generates a rotating magnetic field. The magnetic field penetrates the stator teeth and drives the permanent magnet on the rotor core to rotate. The stator support ring carries the limiting slot, which precisely constrains the circumferential position of the stator teeth and ensures that the air gap between each stator tooth and the rotor core remains constant.

[0012] A heat dissipation cover is fixedly connected to the end of the motor housing. Both inner walls of the heat dissipation cover are movably connected to a linkage shaft via bearings. A fan blade is fixedly connected to the outer wall of the middle part of the linkage shaft. One end of the drive shaft passes through the motor housing and extends into the interior of the heat dissipation cover. The drive shaft and the heat dissipation cover are connected by bearings.

[0013] By adopting the above technical solution, the heat dissipation cover plays a heat dissipation role. The rotating extension end of the drive shaft drives the active gear to rotate synchronously. The active gear meshes with the driven gears on both sides to distribute the power to two sets of linkage shafts. The linkage shafts drive the blades to rotate at high speed. The blades form an axial centrifugal airflow in the heat dissipation cover. The airflow penetrates the air duct holes of the motor housing and blows directly onto the surface of the stator winding. At the same time, it discharges heat along the gap of the rotor core, thereby playing a heat dissipation role. The two sets of blades are symmetrically arranged to form a tornado-like convection at the tail of the motor. The heat dissipation surface area coverage reaches 95%. The power is completely taken from the motor shaft, with zero additional power consumption.

[0014] The drive shaft is located inside the heat dissipation cover and has a drive gear fixedly connected to one side of its outer wall. Both sets of linkage shafts have driven gears fixedly connected to one side of their outer walls. The drive gear meshes with the two sets of driven gears.

[0015] By adopting the above technical solution, the driving gear and the driven gear play a linkage driving role. The driving gear is driven to rotate through the drive shaft, and the rotation of the driving gear drives the driven gears on both sides to rotate synchronously.

[0016] The inner wall of the motor housing is surrounded by heat exchange copper tubes. A cold water box is fixedly connected to one side of the top of the motor housing. A passive cooling chamber and an active cooling chamber are provided on one side of the inside of the cold water box. Both ends of the heat exchange copper tubes are connected to a diversion pipe through a three-way valve. There are two sets of diversion pipes, and the two sets of diversion pipes are respectively connected to the passive cooling chamber and the active cooling chamber.

[0017] By adopting the above technical solution, the coolant flows through the heat exchange copper tube, which absorbs the heat of the motor to achieve the heat dissipation of the motor. At the same time, the coolant inside the heat exchange copper tube can switch between the passive cooling chamber and the active cooling chamber during the circulation process through the switching of the three-way valve and the diverter pipe.

[0018] The heat exchange copper tube, the passive cooling chamber, and the active cooling chamber are all filled with coolant. The passive cooling chamber is filled with a temperature phase change module, and a pressure sensor is installed on the inner wall of the passive cooling chamber.

[0019] By adopting the above technical solution, when the motor temperature is low, the three-way valve controls the heat exchange copper tube to connect with the passive cooling chamber. During the internal coolant circulation process, the coolant after heat exchange flows through the temperature phase change module. The temperature phase change module expands when heated, thereby absorbing heat from the flowing coolant, thus achieving the cooling of the coolant. The temperature phase change module is a paraffin microcapsule, which completes basic heat dissipation with zero energy consumption.

[0020] A semiconductor cooler is installed on one side of the inner wall of the active cooling chamber. The cooling end of the semiconductor cooler is in close contact with the active cooling chamber, while the heat dissipation end is located outside the active cooling chamber. A temperature sensor is embedded inside the heat exchange copper tube.

[0021] By adopting the above technical solution, as the motor temperature gradually increases, the phase change module filled inside the passive cooling chamber expands to its final enlarged volume when flowing through it. This enlarges the volume and compresses the inner wall of the passive cooling chamber, affecting the water flow and increasing the internal pressure. When the pressure sensor detects that the pressure has reached the set value, the receiving control module controls the three-way valve to switch the passage and simultaneously controls the semiconductor cooler to start, connecting the heat exchange copper tube to the active cooling chamber. The semiconductor cooler continuously cools the coolant inside the heat exchange copper tube, forming a reinforced cooling closed loop. The physical properties of the phase change material are converted into control signals, replacing electronic sensors and water pumps. This achieves zero-perception heat dissipation while breaking through the heat dissipation limit. At the same time, the multi-level gradient heat dissipation cooling method achieves precise heat dissipation and energy saving.

[0022] One side of the heat exchange copper tube extends through the interior of the heat dissipation cover, and the linkage shaft on one side extends through the middle of the heat exchange copper tube. The linkage shaft and the heat exchange copper tube are connected by a sealed bearing, and a sealing ring is provided at the connection between the linkage shaft and the heat exchange copper tube.

[0023] By adopting the above technical solution, the linkage shaft passes through the heat exchange copper tube, allowing it to rotate inside the heat exchange copper tube. At the same time, by setting a sealing ring, leakage of coolant inside the heat exchange copper tube can be prevented.

[0024] The linkage shaft is located inside the heat exchange copper tube and is fixedly connected to a first bevel gear on one side of the outer wall. A fixing frame is provided on one side of the inner wall of the heat exchange copper tube. A connecting rod is connected to the middle of the fixing frame through a bearing. A second bevel gear is fixedly connected to one end of the connecting rod. The first bevel gear and the second bevel gear mesh with each other. Spiral impellers are arranged at equal intervals on the middle outer wall of the connecting rod.

[0025] By adopting the above technical solution, the drive shaft rotates, which drives the drive gear to rotate. The drive gear drives the linkage shaft to rotate at high speed. The first bevel gear at the end of the linkage shaft meshes with the second bevel gear, thereby converting the axial rotation into radial rotation, which in turn drives the connecting rod to rotate. The rotation of the connecting rod drives the spiral impeller to spin and cut at high speed in the heat exchange copper tube. The spiral impeller applies centrifugal thrust to the coolant, generating a high-pressure flow. The coolant forms turbulence in the heat exchange copper tube, thereby driving the coolant to circulate in the heat exchange copper tube. By using the surplus kinetic energy of the motor to drive the pump, it achieves energy-saving effect compared to an independent water pump, while also saving installation space for an independent water pump.

[0026] The inner wall of the motor housing is surrounded by sound insulation pads, and an air duct hole is provided between the motor housing and the heat dissipation cover. A receiving control module is provided on one outer wall of the motor housing.

[0027] By adopting the above technical solution, the sound insulation pad plays a sound insulation role, and the electromagnetic noise and rotor wind noise are gradually eliminated by the sound insulation pad impacting the inner wall of the motor housing. The receiving and control module starts to receive and process signals and perform control functions, and the air duct hole plays an auxiliary heat dissipation role.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. When the drive shaft drives the rotor core to rotate, the multi-pole magnetic encoder ring fixed on the side of the rotor generates a change in the spatial magnetic field. The circumferentially arranged tunnel magnetoresistive element array captures the magnetic field signal in real time. The rotor angular position is analyzed by the change in magnetoresistive resistance. Simultaneously, the microelectromechanical inertial measurement unit detects the three-dimensional vibration and angular velocity of the motor. The Kalman filter algorithm is used to fuse with the magnetic position signal to eliminate the detection error caused by mechanical vibration. This process continuously outputs high-precision position data to the receiving control module to achieve seamless FOC control.

[0030] 2. By continuously cooling the coolant inside the heat exchange copper tube through a semiconductor cooler, a reinforced cooling closed loop is formed. The physical properties of the phase change material are converted into control signals, replacing electronic sensors and water pumps. While breaking through the heat dissipation limit, zero-perceptible heat dissipation is achieved. At the same time, through a multi-level gradient heat dissipation and cooling method, precise heat dissipation and energy saving are achieved. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of an embodiment of this application;

[0032] Figure 2 This is a rear-view stereoscopic structural diagram of an embodiment of this application;

[0033] Figure 3 This is a schematic cross-sectional view of an embodiment of this application;

[0034] Figure 4 This is a schematic diagram of the internal structure of the heat dissipation back cover according to an embodiment of this application;

[0035] Figure 5 This is a schematic diagram of the connection structure between the connecting rod and the helical impeller in an embodiment of this application;

[0036] Figure 6 This is a schematic diagram of the internal connection structure of the cold water box according to an embodiment of this application;

[0037] Figure 7 This is a front view structural diagram of an embodiment of this application;

[0038] Figure 8 This is a top view of an embodiment of the present application.

[0039] Explanation of reference numerals in the attached drawings: 1. Motor housing; 2. Drive shaft; 3. Rotor core; 4. Permanent magnet; 5. Stator assembly; 6. Stator support ring; 7. Limiting slot; 8. Stator teeth; 9. Stator winding; 10. Tunnel reluctance element; 11. Multi-pole magnetic encoder ring; 12. Microelectromechanical inertial measurement unit; 13. Heat sink cover; 14. Linkage shaft; 141. Fan blades; 15. Drive gear; 16. Driven gear; 17. Heat exchanger. 18. Copper pipe; 19. Cold water box; 20. Passive cooling chamber; 21. Active cooling chamber; 22. Diverter pipe; 23. Temperature phase change module; 24. Pressure sensor; 25. Semiconductor cooler; 26. Temperature sensor; 27. Sealing ring; 28. First bevel gear; 29. ​​Fixing bracket; 30. Connecting rod; 31. Second bevel gear; 32. Spiral impeller; 33. Sound insulation pad; 34. Air duct hole; 35. Receiving control module. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1 - Appendix Figure 8 This application will be described in further detail below.

[0041] Example: A brushless internal rotation motor for a treadmill includes a motor housing 1. A drive shaft 2 is installed through the center of the motor housing 1 and connected to the motor housing 1 via ball bearings. Rotor cores 3 are installed on both sides of the middle of the drive shaft 2. Permanent magnets 4 are installed in the middle of the two sets of rotor cores 3. A stator assembly 5 is connected to the inner wall of the motor housing 1. A tunnel magnetoresistive element 10 is installed on the back of the stator assembly 5. A multi-pole magnetic coding ring 11 is fixedly connected to one side of the outer wall of the rotor core 3. Multiple sets of tunnel magnetoresistive elements 10 are arranged at equal intervals and matched with the multi-pole magnetic coding rings 11. A microelectromechanical inertial measurement unit 12 is installed on one side of the tunnel magnetoresistive element 10. The microelectromechanical inertial measurement unit 12 includes an accelerometer and a gyroscope. When the drive shaft 2 drives the rotor core 3 to rotate, the multi-pole magnetic encoder ring 11 fixed on the rotor side generates a change in the spatial magnetic field. The circumferentially arranged tunnel magnetoresistive element array 10 captures the magnetic field signal in real time. The rotor angular position is analyzed by the change in magnetoresistive resistance. Simultaneously, the microelectromechanical inertial measurement unit 12 detects the three-dimensional vibration and angular velocity of the motor. The Kalman filter algorithm is used to fuse with the magnetic position signal to eliminate the detection error caused by mechanical vibration. This process continuously outputs high-precision position data to the receiving control module 33 to realize sensorless FOC control. In essence, it builds a closed-loop sensing system with high static precision and high dynamic reliability. It solves the limitations of the pure magnetic encoding scheme in extreme dynamic scenarios and provides a near-ideal position feedback signal for high dynamic servo systems.

[0042] The stator assembly 5 includes a stator support ring 6, a limiting slot 7, stator teeth 8, and a stator winding 9. The inner wall of the stator support ring 6 is provided with limiting slots 7, and stator teeth 8 are embedded inside the multiple sets of limiting slots 7. The outer wall of the stator teeth 8 is wound with stator windings 9. When current is input into the stator windings 9, a rotating magnetic field is generated. The magnetic field penetrates the stator teeth 8 and drives the permanent magnet 4 on the rotor core 3 to rotate. The stator support ring 6 carries the limiting slots 7 and precisely constrains the circumferential position of the stator teeth 8 to ensure that the air gap between each stator tooth 8 and the rotor core 3 remains constant.

[0043] A heat dissipation cover 13 is fixedly connected to the end of the motor housing 1. Both sides of the inner wall of the heat dissipation cover 13 are movably connected to the linkage shaft 14 through bearings. The middle outer wall of the linkage shaft 14 is fixedly connected to the fan blade 141. One end of the drive shaft 2 extends through the motor housing 1 to the inside of the heat dissipation cover 13, and the drive shaft 2 and the heat dissipation cover 13 are connected through bearings. The heat dissipation cover 13 plays a role in heat dissipation. The rotating extension end of the drive shaft 2 drives the drive gear 15 to rotate synchronously. The drive gear 15 meshes with the driven gears 16 on both sides to distribute the power to the two sets of linkage shafts 14. The linkage shaft 14 drives the fan blade 141 to rotate at high speed. The fan blade 141 forms an axial centrifugal airflow in the heat dissipation cover 13. The airflow penetrates the air duct hole 32 of the motor housing 1 and blows directly onto the surface of the stator winding 9. At the same time, it discharges heat along the gap of the rotor core 3, thereby playing a role in heat dissipation. The two sets of fan blades 141 are symmetrically arranged to form a tornado-like convection at the tail of the motor. The heat dissipation surface area coverage reaches 95%. The power is completely taken from the motor shaft, with zero additional power consumption.

[0044] The drive shaft 2 is located inside the heat dissipation cover 13 and is fixedly connected to one side of the outer wall of the drive shaft 2. The driven gears 16 are fixedly connected to one side of the outer wall of the two sets of linkage shafts 14. The drive gear 15 meshes with the two sets of driven gears 16. The drive gear 15 and the driven gears 16 play a linkage driving role. The drive shaft 2 drives the drive gear 15 to rotate, and the rotation of the drive gear 15 drives the driven gears 16 on both sides to rotate synchronously.

[0045] A heat exchange copper tube 17 is connected around the inner wall of the motor housing 1. A cold water box 18 is fixedly connected to the top side of the motor housing 1. A passive cooling chamber 19 and an active cooling chamber 20 are provided on one side of the cold water box 18. Both ends of the heat exchange copper tube 17 are connected to a diversion pipe 21 through a three-way valve. There are two sets of diversion pipes 21. The two sets of diversion pipes 21 are connected to the passive cooling chamber 19 and the active cooling chamber 20 respectively. The coolant flows through the heat exchange copper tube 17 and absorbs the heat of the motor through the heat exchange copper tube 17 to achieve the heat dissipation of the motor. At the same time, the coolant inside the heat exchange copper tube 17 can switch between the passive cooling chamber 19 and the active cooling chamber 20 during the circulation process through the switching of the three-way valve and the diversion pipe 21.

[0046] The heat exchange copper tube 17, the passive cooling chamber 19, and the active cooling chamber 20 are all filled with coolant. The passive cooling chamber 19 is filled with a temperature phase change module 22, and a pressure sensor 23 is installed on the inner wall of the passive cooling chamber 19. When the motor temperature is low, the three-way valve controls the heat exchange copper tube 17 to connect with the passive cooling chamber 19. During the internal coolant circulation, the cooled coolant flows through the temperature phase change module 22. The temperature phase change module 22 expands when heated, thereby absorbing heat from the flowing coolant and thus cooling the coolant. The temperature phase change module 22 is a paraffin microcapsule, which completes basic heat dissipation with zero energy consumption.

[0047] A semiconductor cooler 24 is installed on one side of the inner wall of the active cooling chamber 20. The cooling end of the semiconductor cooler 24 is in close contact with the active cooling chamber 20, while the heat dissipation end is located outside the active cooling chamber 20. A temperature sensor 25 is embedded inside the heat exchange copper tube 17. When the motor temperature gradually increases, the phase change module 22 filled inside the passive cooling chamber 19 expands to its final enlarged volume, which will squeeze the inner wall of the passive cooling chamber 19, thereby affecting the water flow and increasing the internal pressure. When the pressure sensor 23 detects that the pressure has reached the set value, the receiving control module 33 controls the three-way valve to switch the passage and simultaneously controls the semiconductor cooler 24 to start, so that the heat exchange copper tube 17 is connected to the active cooling chamber 20. The semiconductor cooler 24 continuously cools the coolant inside the heat exchange copper tube 17, forming a strengthened cooling closed loop. The physical characteristics of the phase change material are converted into control signals, replacing electronic sensors and water pumps. While breaking through the heat dissipation limit, zero-sensory heat dissipation is achieved. At the same time, through the multi-level gradient heat dissipation cooling method, precise heat dissipation and energy saving are achieved.

[0048] One side of the heat exchange copper tube 17 extends through the interior of the heat dissipation back cover 13, and the other side of the linkage shaft 14 extends through the middle of the heat exchange copper tube 17. The linkage shaft 14 is connected to the heat exchange copper tube 17 through a sealed bearing, and a sealing ring 26 is provided at the connection between the linkage shaft 14 and the heat exchange copper tube 17. The linkage shaft 14 extends through the heat exchange copper tube 17 so that it can rotate inside the heat exchange copper tube 17. At the same time, the sealing ring 26 can prevent the coolant inside the heat exchange copper tube 17 from leaking.

[0049] A first bevel gear 27 is fixedly connected to the outer wall of one side of the linkage shaft 14 inside the heat exchange copper tube 17. A fixing bracket 271 is provided on the inner wall of one side of the heat exchange copper tube 17. A connecting rod 28 is connected to the middle of the fixing bracket 271 through a bearing. A second bevel gear 29 is fixedly connected to one end of the connecting rod 28. The first bevel gear 27 and the second bevel gear 29 mesh with each other. Spiral impellers 30 are arranged at equal intervals on the outer wall of the middle of the connecting rod 28. The rotation of the drive shaft 2 drives the drive gear 15 to rotate, which in turn drives the linkage shaft 14 to rotate. The high-speed rotation of the linkage shaft 14 causes the first bevel gear 27 at the end of the linkage shaft 14 to mesh with the second bevel gear 29, thereby converting the axial rotation into radial rotation. This drives the connecting rod 28 to rotate, and the rotation of the connecting rod 28 drives the spiral impeller 30 to spin at high speed within the heat exchange copper tube 17. The spiral impeller 30 applies centrifugal thrust to the coolant, generating a high-pressure flow. The coolant forms turbulence within the heat exchange copper tube 17, thus promoting the circulation of the coolant within the heat exchange copper tube 17. By utilizing the surplus kinetic energy of the motor, it achieves energy-saving effects compared to an independent water pump, while also saving installation space for an independent water pump.

[0050] The inner wall of the motor housing 1 is surrounded by a sound insulation pad 31. A duct hole 32 is provided between the motor housing 1 and the heat dissipation cover 13. A receiving control module 33 is provided on one side of the outer wall of the motor housing 1. The sound insulation pad 31 plays a role in sound insulation. Electromagnetic noise and rotor wind noise are eliminated by impacting the sound insulation pad 31 on the inner wall of the motor housing 1. The receiving control module 33 starts to receive and process signals and perform control functions. The duct hole 32 plays a role in auxiliary heat dissipation.

[0051] The implementation principle of this application embodiment is as follows: First, current is input into the stator winding 9 to generate a rotating magnetic field. The magnetic field penetrates the stator teeth 8 and drives the permanent magnet 4 on the rotor core 3 to rotate. When the drive shaft 2 drives the rotor core 3 to rotate, the multi-pole magnetic encoder ring 11 fixed on the rotor side generates a change in the spatial magnetic field. The circumferentially arranged tunnel magnetoresistive element array 10 captures the magnetic field signal in real time. The rotor angular position is analyzed by the change in magnetoresistive resistance. Simultaneously, the microelectromechanical inertial measurement unit 12 detects the three-dimensional vibration and angular velocity of the motor. The Kalman filter algorithm is used to fuse with the magnetic position signal to eliminate the detection error caused by mechanical vibration. This process continuously outputs high-precision position data to the receiving control module 33 to realize sensorless FOC control. The rotating extension end of the drive shaft 2 drives the drive gear. The 15 rotating synchronously, with the driving gear 15 meshing with the driven gears 16 on both sides, distributes power to the two sets of linkage shafts 14. The linkage shafts 14 drive the fan blades 141 to rotate at high speed. The fan blades 141 form an axial centrifugal airflow within the heat dissipation cover 13. The airflow penetrates the air duct holes 32 of the motor housing 1 and directly blows onto the surface of the stator winding 9, while simultaneously dissipating heat along the gaps in the rotor core 3, thus achieving heat dissipation. The two sets of fan blades 141 are symmetrically arranged, forming a tornado-like convection at the tail of the motor, with a heat dissipation surface area coverage of 95%. The power is entirely derived from the motor shaft, with zero additional power consumption. The coolant flows through the heat exchange copper tubes 17, absorbing heat from the motor to achieve heat dissipation. At the same time, the coolant inside the heat exchange copper tubes 17 can circulate during the process. The flow switches between the passive cooling chamber 19 and the active cooling chamber 20 via the three-way valve and the diverter pipe 21. The drive shaft 2 rotates, driving the drive gear 15 to rotate. The drive gear 15 drives the linkage shaft 14 to rotate at high speed. The first bevel gear 27 at the end of the linkage shaft 14 meshes with the second bevel gear 29, thus converting the axial rotation into radial rotation, which in turn drives the connecting rod 28 to rotate. The rotation of the connecting rod 28 drives the spiral impeller 30 to rotate at high speed in the heat exchange copper tube 17. The spiral impeller 30 applies centrifugal thrust to the coolant, generating a high-pressure flow. The coolant forms turbulence in the heat exchange copper tube 17, thus driving the coolant to circulate in the heat exchange copper tube 17. When the motor temperature is low, the three-way valve controls the connection between the heat exchange copper tube 17 and the passive cooling chamber 19. When the internal coolant temperature is low, the three-way valve controls the connection between the heat exchange copper tube 17 and the passive cooling chamber 19. During the circulation process, the cooled liquid after heat exchange flows through the temperature phase change module 22. The temperature phase change module 22 expands when heated, thereby absorbing heat from the flowing cool liquid and achieving cooling. The temperature phase change module 22 is a paraffin microcapsule, which completes basic heat dissipation with zero energy consumption. As the motor temperature gradually increases, when the coolant flows through the passive cooling chamber 19, the temperature phase change module 22 inside expands to its final enlarged volume, which compresses the inner wall of the passive cooling chamber 19, thus affecting the flow of water and increasing its internal pressure. When the pressure sensor 23 detects that the pressure has reached the set value, the receiving control module 33 controls the three-way valve to switch the passage and simultaneously controls the semiconductor cooler 24 to start, connecting the heat exchange copper tube 17 to the active cooling chamber 20.The semiconductor cooler 24 continuously cools the coolant inside the heat exchange copper tube 17, forming a reinforced cooling closed loop. This transforms the physical properties of the phase change material into control signals, replacing electronic sensors and water pumps. While breaking through heat dissipation limits, it achieves zero-perceptible heat dissipation. Furthermore, through a multi-stage gradient cooling method, it achieves precise heat dissipation and energy savings.

[0052] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A brushless internal rotation motor for a treadmill, comprising a motor housing (1), characterized in that: A drive shaft (2) is provided through the center of the motor housing (1). The drive shaft (2) is connected to the motor housing (1) by a ball bearing. Rotor cores (3) are provided on both sides of the middle of the drive shaft (2). Permanent magnets (4) are provided in the middle of the two sets of rotor cores (3). A stator assembly (5) is connected to the inner wall of the motor housing (1). A tunnel magnetoresistive element (10) is provided on the back of the stator assembly (5). A multi-pole magnetic coding ring (11) is fixedly connected to one side of the outer wall of the rotor core (3). Multiple sets of tunnel magnetoresistive elements (10) are provided and are arranged at equal intervals. The tunnel magnetoresistive elements (10) are matched with the multi-pole magnetic coding ring (11). A microelectromechanical inertial measurement unit (12) is provided on one side of the tunnel magnetoresistive element (10). The microelectromechanical inertial measurement unit (12) includes an accelerometer and a gyroscope. The end of the motor housing (1) is fixedly connected to a heat dissipation cover (13). The inner walls of both sides of the heat dissipation cover (13) are movably connected to a linkage shaft (14) through bearings. The outer wall of the middle part of the linkage shaft (14) is fixedly connected to a fan blade (141). One end of the drive shaft (2) passes through the motor housing (1) and extends into the interior of the heat dissipation cover (13). The drive shaft (2) and the heat dissipation cover (13) are connected by bearings. The drive shaft (2) is fixedly connected to a drive gear (15) on one side of the outer wall inside the heat dissipation cover (13), and the two sets of linkage shafts (14) are fixedly connected to driven gears (16) on one side of the outer wall. The drive gear (15) meshes with the two sets of driven gears (16). The inner wall of the motor housing (1) is surrounded by a heat exchange copper tube (17). A cold water box (18) is fixedly connected to one side of the top of the motor housing (1). A passive cooling chamber (19) and an active cooling chamber (20) are provided on one side of the inside of the cold water box (18). Both ends of the heat exchange copper tube (17) are connected to a diversion pipe (21) through a three-way valve. There are two sets of diversion pipes (21). The two sets of diversion pipes (21) are connected to the passive cooling chamber (19) and the active cooling chamber (20) respectively.

2. The internal rotary brushless motor for a treadmill according to claim 1, characterized in that: The stator assembly (5) includes a stator support ring (6), a limiting slot (7), stator teeth (8) and a stator winding (9). The inner wall of the stator support ring (6) is provided with limiting slots (7), and stator teeth (8) are embedded in the interior of multiple sets of limiting slots (7). The outer wall of the stator teeth (8) is wound with stator windings (9).

3. The internal brushless motor for a treadmill according to claim 1, characterized in that: The heat exchange copper tube (17), the passive cooling chamber (19) and the active cooling chamber (20) are all equipped with coolant. The passive cooling chamber (19) is filled with a temperature phase change module (22), and a pressure sensor (23) is installed on the inner wall of the passive cooling chamber (19).

4. The internal brushless motor for a treadmill according to claim 3, characterized in that: A semiconductor cooler (24) is provided on one side of the inner wall of the active cooling chamber (20). The cooling end of the semiconductor cooler (24) is in close contact with the active cooling chamber (20), and the heat dissipation end is located outside the active cooling chamber (20). A temperature sensor (25) is embedded inside the heat exchange copper tube (17).

5. The internal rotary brushless motor for a treadmill according to claim 4, characterized in that: One side of the heat exchange copper tube (17) extends through the interior of the heat dissipation cover (13), and the linkage shaft (14) on one side extends through the middle of the heat exchange copper tube (17). The linkage shaft (14) and the heat exchange copper tube (17) are connected by a sealed bearing, and a sealing ring (26) is provided at the connection between the linkage shaft (14) and the heat exchange copper tube (17).

6. The internal rotary brushless motor for a treadmill according to claim 5, characterized in that: The linkage shaft (14) is located inside the heat exchange copper tube (17) and a first bevel gear (27) is fixedly connected to one side of the outer wall. A fixing frame (271) is provided on one side of the inner wall of the heat exchange copper tube (17). A connecting rod (28) is connected to the middle of the fixing frame (271) through a bearing. A second bevel gear (29) is fixedly connected to one end of the connecting rod (28). The first bevel gear (27) meshes with the second bevel gear (29). Spiral impellers (30) are arranged at equal intervals on the middle outer wall of the connecting rod (28).

7. The internal brushless motor for a treadmill according to claim 5, characterized in that: The inner wall of the motor housing (1) is surrounded by a sound insulation pad (31), and a duct hole (32) is provided between the motor housing (1) and the heat dissipation cover (13). A receiving control module (33) is provided on one side of the outer wall of the motor housing (1).

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