Internal rotation brushless motor for treadmill

Abstract

The invention relates to an internal rotation brushless motor for a treadmill, in particular to the technical field of motors for treadmills, a driving shaft is arranged at the center of a motor shell in a penetrating mode, the driving shaft is connected with the motor shell through a ball bearing, and rotor iron cores are arranged on the two sides of the middle of the driving shaft; the middle parts of the two groups of rotor cores are provided with permanent magnets, the inner wall of the motor shell is connected with a stator assembly, the back part of the stator assembly is provided with a tunnel reluctance element, the outer wall of one side of each rotor core is fixedly connected with a multi-pole magnetic coding ring, one side of the tunnel reluctance element is provided with a micro-electro-mechanical inertial measurement unit, and the outer wall of the rotor core is fixedly connected with a motor shell. The multi-pole magnetic coding ring fixed on the rotor side generates space magnetic field change, the tunnel magnetic resistance element array arranged in the circumferential direction captures magnetic field signals in real time, the Kalman filtering algorithm is fused with magnetic position signals, and detection errors caused by mechanical vibration are eliminated.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of motors for treadmills, in particular to an inner-rotating brushless motor for a treadmill. BACKGROUND

[0002] The motor of a treadmill needs to cope with different exercise modes, such as walking, running, intermittent running, etc. These modes require the motor to operate at different speeds and loads. To ensure smooth transition of these modes and avoid unexpected shutdown or power shortage, precise speed and position feedback of the motor of the treadmill is needed to improve control accuracy.

[0003] In the prior art, a block type inner-rotating brushless motor is disclosed in Chinese Patent No. CN117595581A, which comprises a shell, a block type coil holder, a coil, a block type magnetic core and a rotor. Heat pipes are arranged between the two adjacent block type coil holders in the interior of the shell. Insert holes are formed in the end of the shell corresponding to the positions of the heat pipes. The ends of the heat pipes extend to the outside of the shell through the interiors of the corresponding insert holes, and the ends of the heat pipes are fixed with a mounting ring. The side wall of the mounting ring is fixed with a plurality of evenly distributed mounting pieces, and the mounting pieces are provided with bolts for screwing with the end of the shell. The block type inner-rotating brushless motor is provided with a plurality of heat pipes in the interior of the motor shell. The heat pipes can conduct the heat in the interior of the shell outward, so that the temperature in the interior of the shell is quickly reduced, avoiding damage to the interior of the shell due to high temperature, and prolonging the service life of the motor.

[0004] The inventors found the following problems in the prior art during the implementation of the application: In the prior art, an encoder and a Hall sensor are used to sample the rotating state of the motor, which has been maturely applied on treadmills. However, the traditional encoder has wear and maintenance problems due to the contact design with the motor shaft, and the Hall sensor has insufficient resolution accuracy, which can cause inaccurate sampling and lead to inaccurate motor rotation control, unstable start and stop, and thus affect the operation of the running belt, causing poor foot feeling of the user and limiting its use in the operation of the treadmill. SUMMARY

[0005] The purpose of the application is to provide an inner-rotating brushless motor for a treadmill.

[0006] In the first aspect, the inner-rotating brushless motor for a treadmill provided by the application adopts the following technical solution: The application discloses a treadmill inner rotation brushless motor, which comprises a motor shell, a driving shaft is arranged through the center of the motor shell, the driving shaft is connected with the motor shell through a ball bearing, a rotor iron core is arranged on the both sides of the middle part of the driving shaft, permanent magnets are arranged on the middle parts of the two rotor iron cores, a stator assembly is connected to the inner wall of the motor shell, a tunnel magnetoresistance element is arranged on the back of the stator assembly, a multi-pole magnetic coding ring is fixedly connected to the outer wall of one side of the rotor iron core, the tunnel magnetoresistance element is arranged in multiple groups and is equidistantly arranged, the tunnel magnetoresistance element is matched with the multi-pole magnetic coding ring, a micro-electro-mechanical inertial measurement unit is arranged on one side of the tunnel magnetoresistance element, and the micro-electro-mechanical inertial measurement unit comprises an accelerometer and a gyroscope.

[0007] When the driving shaft drives the rotor iron core to rotate, the multi-pole magnetic coding ring fixed to the rotor side generates a space magnetic field change, the circumferentially arranged tunnel magnetoresistance element array captures the magnetic field signal in real time, the rotor angle position is analyzed through the magnetic resistance change, simultaneously, the micro-electro-mechanical inertial measurement unit detects the three-dimensional vibration and angular velocity of the motor, the detection error caused by mechanical vibration is eliminated through Kalman filtering algorithm and magnetic position signal fusion, high-precision position data is continuously output to the receiving control module, the non-inductive FOC control is realized, and the essence is to construct a static high-precision and dynamic high-reliability closed-loop sensing system, which solves the limitation of the pure magnetic coding scheme in the extreme dynamic scene and provides an ideal position feedback signal for a high-dynamic servo system.

[0008] The stator assembly comprises a stator support ring, a limiting clamping groove, a stator tooth and a stator winding, the inner wall of the stator support ring is arranged with the limiting clamping grooves, the interiors of the limiting clamping grooves are embedded with the stator teeth, and the outer wall of the stator tooth is wound with the stator winding.

[0009] Through the above technical scheme, the current input stator winding generates a rotating magnetic field, the magnetic field penetrates the stator tooth, drives the permanent magnet on the rotor iron core to rotate, the stator support ring bears the limiting clamping groove, the circumferential position of the stator tooth is accurately constrained, and the air gap between each stator tooth and the rotor iron core is ensured to be constant.

[0010] The end of the motor shell is fixedly connected with a heat dissipation rear cover, the inner walls of the two sides of the heat dissipation rear cover are movably connected with linkage shafts through bearings, the outer wall of the middle part of the linkage shaft is fixedly connected with a leaf fan, one end of the driving shaft extends to the interior of the heat dissipation rear cover through the motor shell, and the driving shaft is connected with the heat dissipation rear cover through a bearing.

[0011] By adopting the technical scheme, the heat dissipation rear cover plays a heat dissipation role, the driving shaft drives the driving gear to rotate, the driving gear meshes with the two side driven gears to distribute power to the two groups of linkage shafts, the linkage shafts drive the leaf fans to rotate at high speed, the leaf fans form axial centrifugal airflow in the heat dissipation rear cover, the airflow penetrates the air duct holes of the motor shell to directly blow the surface of the stator winding, and the airflow discharges heat along the rotor core gap, thereby playing a heat dissipation role, the two groups of leaf fans are symmetrically arranged to form a tornado-like convection at the tail of the motor, the heat dissipation surface area coverage rate reaches 95%, and power is completely taken from the motor rotating shaft without additional power consumption.

[0012] The driving shaft is fixedly connected with a driving gear on one side of the inner wall of the heat dissipation rear cover, and the two groups of linkage shafts are fixedly connected with driven gears on one side of the outer wall.

[0013] By adopting the technical scheme, the driving gear and the driven gear play a linkage driving role, the driving shaft drives the driving gear to rotate, and the driving gear drives the two side driven gears to rotate synchronously.

[0014] The inner wall of the motor shell is connected with a heat exchange copper pipe, one side of the top of the motor shell is fixedly connected with a cold water box, one side of the inside of the cold water box is provided with a passive cooling chamber and an active cooling chamber, and the two ends of the heat exchange copper pipe are connected with shunt pipes through three-way valves, and the shunt pipes are provided in two groups.

[0015] By adopting the technical scheme, the cooling liquid flows through the heat exchange copper pipe, absorbs the heat of the motor through the heat exchange copper pipe, and realizes heat dissipation of the motor, and the cooling liquid in the heat exchange copper pipe can switch the flow in the passive cooling chamber and the active cooling chamber in the circulation process through the switching of the three-way valves and the shunt pipes.

[0016] The inside of the heat exchange copper pipe, the passive cooling chamber and the active cooling chamber are provided with cooling liquid, the inside of the passive cooling chamber is filled with a temperature phase change module, and the inner wall of the passive cooling chamber is provided with a pressure sensor.

[0017] By adopting the technical scheme, when the temperature of the motor is low, the three-way valve controls the heat exchange copper pipe to be communicated with the passive cooling chamber, and when the cooling liquid circulates, the cooled cooling liquid flows through the temperature phase change module, the temperature phase change module expands when heated to absorb heat of the flowing cooling liquid, thereby realizing cooling of the cooling liquid, the temperature phase change module is a paraffin microcapsule, and zero energy consumption is realized for basic heat dissipation.

[0018] The inner wall of the active cooling chamber is provided with a semiconductor refrigerator, the refrigeration end of the semiconductor refrigerator is in close contact with the active cooling chamber, and the heat dissipation end is arranged outside the active cooling chamber.

[0019] By adopting the above technical scheme, when the motor temperature gradually rises, the temperature phase change module filled in the passive cooling chamber expands to the final enlarged volume when flowing through the passive cooling chamber, thereby extruding the inner wall of the passive cooling chamber, affecting the water flow, and increasing the internal pressure. When the pressure detected by the pressure sensor reaches the set value, the three-way valve is switched by the receiving control module, and the semiconductor refrigerator is started, so that the heat exchange copper pipe is in communication with the active cooling chamber, the internal cooling liquid of the heat exchange copper pipe is continuously cooled by the semiconductor refrigerator, a strengthened cooling closed loop is formed, the physical properties of the phase change material are converted into a control signal, and the electronic sensor and the water pump are replaced. At the same time of breaking through the heat dissipation limit, zero perception heat dissipation is realized, and at the same time, the multi-stage gradient heat dissipation cooling mode plays the effects of precise heat dissipation and energy saving.

[0020] One side of the heat exchange copper pipe penetrates into the inside of the heat dissipation rear cover, and the linkage shaft penetrates into the middle part of the heat exchange copper pipe, and the linkage shaft and the heat exchange copper pipe are connected through a sealing bearing, and a sealing ring is arranged at the connection between the linkage shaft and the heat exchange copper pipe.

[0021] By adopting the above technical scheme, the linkage shaft penetrates into the heat exchange copper pipe, so that it can rotate in the heat exchange copper pipe, and the sealing ring can prevent the cooling liquid in the heat exchange copper pipe from leaking.

[0022] One side of the linkage shaft located in the inside of the heat exchange copper pipe is fixedly connected with a first bevel gear, one side of the inside of the heat exchange copper pipe is provided with a fixing frame, a connecting rod is connected to the middle part of the fixing frame through a bearing, one end of the connecting rod is fixedly connected with a second bevel gear, the first bevel gear is engaged with the second bevel gear, and a spiral impeller is arranged on the middle part of the outer wall of the connecting rod at equal intervals.

[0023] By adopting the above technical scheme, the driving shaft rotates to drive the driving gear to rotate, the driving gear drives the linkage shaft to rotate at high speed, the first bevel gear at the end of the linkage shaft engages the second bevel gear to convert the axial rotation into radial rotation, thereby driving the connecting rod to rotate, the connecting rod drives the spiral impeller to rotate and cut at high speed in the heat exchange copper pipe, the spiral impeller applies a centrifugal thrust to the cooling liquid to generate high-pressure flow, and the cooling liquid forms a turbulent flow in the heat exchange copper pipe to drive the cooling liquid to circulate in the heat exchange copper pipe. The independent water pump is driven by the motor surplus kinetic energy, and the energy saving effect is achieved, and the installation space of the independent water pump is saved.

[0024] The inner wall of the motor shell is provided with a sound insulation pad, the motor shell and the heat dissipation rear cover are provided with an air duct hole, and one side outer wall of the motor shell is provided with a receiving control module.

[0025] By adopting the above technical scheme, the sound insulation pad plays a sound insulation role, electromagnetic noise and rotor wind noise impact the sound insulation pad of the inner wall of the motor shell, so that the noise is gradually eliminated layer by layer, the receiving control module starts to receive and process signals and controls, and the air duct hole plays an auxiliary heat dissipation role.

[0026] In summary, the present application has at least one of the following beneficial technical effects: 1. When the driving shaft drives the rotor core to rotate, the multi-pole magnetic encoding ring fixed on the rotor side generates a spatial magnetic field change, the circumferentially arranged tunnel magnetoresistance element array captures the magnetic field signal in real time, and the rotor angle position is analyzed through the magnetoresistance change. Synchronously, the micro-electromechanical inertial measurement unit detects the three-dimensional vibration and angular velocity of the motor, fuses the magnetic position signal through the Kalman filtering algorithm, eliminates the detection error caused by mechanical vibration, continuously outputs high-precision position data to the receiving control module, and realizes the non-inductive FOC control; 2. The internal cooling liquid of the heat exchange copper pipe is continuously cooled by the semiconductor refrigerator, a strong cooling closed loop is formed, the physical properties of the phase change material are converted into a control signal, the electronic sensor and the water pump are replaced, the heat dissipation limit is broken through, zero perception heat dissipation is realized, and through the multi-stage gradient heat dissipation cooling mode, the effects of precise heat dissipation and energy saving are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a three-dimensional structure schematic diagram of the embodiment of the present application; Figure 2 It is a rear view three-dimensional structure schematic diagram of the embodiment of the present application; Figure 3 It is an overall cross-sectional structure schematic diagram of the embodiment of the present application; Figure 4 It is an internal structure schematic diagram of the heat dissipation rear cover of the embodiment of the present application; Figure 5 It is a connecting structure schematic diagram of the connecting rod and the spiral impeller of the embodiment of the present application; Figure 6 It is an internal connecting structure schematic diagram of the cold water box of the embodiment of the present application; Figure 7 It is a front view structure schematic diagram of the embodiment of the present application; Figure 8 It is a top view structure schematic diagram of the embodiment of the present application.

[0028] Explanation of reference signs: 1, motor housing; 2, drive shaft; 3, rotor core; 4, permanent magnet; 5, stator assembly; 6, stator support ring; 7, limiting clamping groove; 8, stator tooth; 9, stator winding; 10, tunnel magnetic reluctance element; 11, multi-pole magnetic encoding ring; 12, micro-electro-mechanical inertial measurement unit; 13, heat dissipation rear cover; 14, linkage shaft; 141, leaf fan; 15, driving gear; 16, driven gear; 17, heat exchange copper pipe; 18, cold water box; 19, passive cooling chamber; 20, active cooling chamber; 21, shunt pipe; 22, temperature phase change module; 23, pressure sensor; 24, semiconductor refrigerator; 25, temperature sensor; 26, sealing ring; 27, No. 1 bevel gear; 271, fixing frame; 28, connecting rod; 29, No. 2 bevel gear; 30, spiral impeller; 31, sound insulation gasket; 32, air duct hole; 33, receiving control module. DETAILED DESCRIPTION

[0029] The following will be described in detail below in combination with the accompanying drawings Figure 1 - the accompanying drawings Figure 8 Further detailed description will be made for the present application.

[0030] Embodiment: The inner rotating brushless motor for treadmill comprises a motor housing 1, a drive shaft 2 is arranged through the center of the motor housing 1, the drive shaft 2 and the motor housing 1 are connected through a ball bearing, the middle part of the drive shaft 2 is provided with a rotor core 3 on both sides, the middle part of the two groups of rotor cores 3 is provided with a permanent magnet 4, the inner wall of the motor housing 1 is connected with a stator assembly 5, the back of the stator assembly 5 is provided with a tunnel magnetic reluctance element 10, the outer wall of the rotor core 3 on one side is fixedly connected with a multi-pole magnetic encoding ring 11, the tunnel magnetic reluctance element 10 is provided with multiple groups and is arranged at equal intervals, and the tunnel magnetic reluctance element 10 is matched with the multi-pole magnetic encoding ring 11, the side of the tunnel magnetic reluctance element 10 is provided with a micro-electro-mechanical inertial measurement unit 12, the micro-electro-mechanical inertial measurement unit 12 comprises an accelerometer and a gyroscope, wherein, when the drive shaft 2 drives the rotor core 3 to rotate, the multi-pole magnetic encoding ring 11 fixed on the rotor side generates a space magnetic field change, the circumferentially arranged tunnel magnetic reluctance element 10 array captures the magnetic field signal in real time, the rotor angle position is analyzed through the magnetic resistance change, at the same time, the micro-electro-mechanical inertial measurement unit 12 detects the three-dimensional vibration and angular velocity of the motor, through the Kalman filtering algorithm and the magnetic position signal fusion, the detection error caused by mechanical vibration is eliminated, this process continuously outputs high-precision position data to the receiving control module 33, realizes the non-inductive FOC control, the essence is to build a static high-precision and dynamic high-reliability closed-loop sensing system, which solves the limitation of the pure magnetic encoding scheme in the extreme dynamic scene, and provides an ideal position feedback signal for the high dynamic servo system.

[0031] The stator assembly 5 comprises a stator support ring 6, a limiting slot 7, a stator tooth 8 and a stator winding 9, the inner wall of the stator support ring 6 is arranged with the limiting slot 7, the inside of the plurality of limiting slots 7 is embedded with the stator tooth 8, and the outer wall of the stator tooth 8 is wound with the stator winding 9, wherein the current input stator winding 9 generates a rotating magnetic field, the magnetic field penetrates the stator tooth 8, drives the permanent magnet 4 on the rotor iron core 3 to rotate, and the stator support ring 6 bears the limiting slot 7, accurately restricts the circumferential position of the stator tooth 8, and ensures that the air gap of each stator tooth 8 and the rotor iron core 3 remains constant.

[0032] The end of the motor housing 1 is fixedly connected with a heat dissipation rear cover 13, the inner walls of the two sides of the heat dissipation rear cover 13 are movably connected with linkage shafts 14 through bearings, the middle outer wall of the linkage shaft 14 is fixedly connected with a leaf fan 141, one end of the drive shaft 2 extends to the inside of the heat dissipation rear cover 13 through the motor housing 1, and the drive shaft 2 is connected with the heat dissipation rear cover 13 through a bearing, the heat dissipation rear cover 13 plays a heat dissipation role, the rotating extension end of the drive shaft 2 drives the driving gear 15 to rotate synchronously, the driving gear 15 meshes with the two side driven gears 16 to distribute power to the two groups of linkage shafts 14, the linkage shaft 14 drives the high-speed rotation of the leaf fan 141, the leaf fan 141 forms an axial centrifugal airflow in the heat dissipation rear cover 13, the airflow penetrates the air duct hole 32 of the motor housing 1 and directly blows the surface of the stator winding 9, and at the same time, the airflow discharges heat along the gap of the rotor iron core 3, thereby playing a heat dissipation role, the two groups of leaf fans 141 are symmetrically arranged to form a tornado type convection at the tail of the motor, the heat dissipation surface area coverage rate reaches 95%, and the power is completely taken from the motor rotating shaft without additional power consumption.

[0033] The side outer wall of the drive shaft 2 located in the inside of the heat dissipation rear cover 13 is fixedly connected with the driving gear 15, the side outer walls of the two groups of linkage shafts 14 are fixedly connected with the driven gears 16, and the driving gear 15 and the two groups of driven gears 16 are mutually meshed, wherein the driving gear 15 and the driven gear 16 play a linkage driving role, the driving gear 15 is driven to rotate by the drive shaft 2, and the driving gear 15 drives the two side driven gears 16 to rotate synchronously.

[0034] The inner wall of the motor housing 1 is connected with a heat exchange copper pipe 17, the top side of the motor housing 1 is fixedly connected with a cold water box 18, the inside of the cold water box 18 is provided with a passive cooling chamber 19 and an active cooling chamber 20, the two ends of the heat exchange copper pipe 17 are connected with shunt pipes 21 through three-way valves, and the shunt pipes 21 are provided with two groups, and the two groups of shunt pipes 21 are communicated with the passive cooling chamber 19 and the active cooling chamber 20 respectively, wherein the cooling liquid flows through the heat exchange copper pipe 17, absorbs the heat of the motor through the heat exchange copper pipe 17 to realize the heat dissipation work of the motor, and the cooling liquid in the heat exchange copper pipe 17 can switch the flow in the passive cooling chamber 19 and the active cooling chamber 20 in the circulation process through the switching of the three-way valve and the shunt pipe 21.

[0035] The interior of the heat exchange copper pipe 17, the passive cooling chamber 19 and the active cooling chamber 20 is provided with cooling liquid, the interior of the passive cooling chamber 19 is filled with a temperature phase change module 22, and the inner wall of the passive cooling chamber 19 is provided with a pressure sensor 23. When the motor temperature is low, the three-way valve controls the heat exchange copper pipe 17 to communicate with the passive cooling chamber 19. When the internal cooling liquid circulates, the cooled cooling liquid flows through the temperature phase change module 22, and the temperature phase change module 22 expands when heated to absorb heat from the cooling liquid flowing through, thereby achieving cooling of the cooling liquid. The temperature phase change module 22 is a paraffin microcapsule, and the basic heat dissipation is completed with zero energy consumption.

[0036] A semiconductor refrigerator 24 is arranged on one side of the inner wall of the active cooling chamber 20. The refrigeration end of the semiconductor refrigerator 24 is in close contact with the active cooling chamber 20, and the heat dissipation end is arranged outside the active cooling chamber 20. A temperature sensor 25 is embedded in the interior of the heat exchange copper pipe 17. When the motor temperature gradually increases, the temperature phase change module 22 filled in the passive cooling chamber 19 will be extruded to the inner wall of the passive cooling chamber 19 after expanding to the final enlarged volume, thereby affecting the water flow and increasing the internal pressure. When the pressure reaches the set value detected by the pressure sensor 23, the three-way valve is switched by the receiving control module 33 to control the passage, and the semiconductor refrigerator 24 is started at the same time, so that the heat exchange copper pipe 17 communicates with the active cooling chamber 20. The semiconductor refrigerator 24 continuously cools the cooling liquid in the heat exchange copper pipe 17, forming a strengthened cooling closed loop, converting the physical properties of the phase change material into a control signal, replacing the electronic sensor and water pump, breaking through the heat dissipation limit, realizing zero perception heat dissipation, and at the same time, through the multi-stage gradient heat dissipation cooling mode, precise heat dissipation and energy saving effect are achieved.

[0037] One side of the heat exchange copper pipe 17 penetrates the interior of the heat dissipation rear cover 13, and the middle part of the heat exchange copper pipe 17 is penetrated by the linkage shaft 14. The linkage shaft 14 is connected with the heat exchange copper pipe 17 through a sealing bearing, and a sealing ring 26 is arranged at the connection between the linkage shaft 14 and the heat exchange copper pipe 17. The linkage shaft 14 penetrates the heat exchange copper pipe 17, so that it can rotate in the heat exchange copper pipe 17. At the same time, the sealing ring 26 can prevent the cooling liquid in the heat exchange copper pipe 17 from leaking.

[0038] The linkage shaft 14 is fixedly connected with a first bevel gear 27 on one side of the outer wall inside the heat exchange copper pipe 17, the inner wall of one side of the heat exchange copper pipe 17 is provided with a fixing frame 271, the middle part of the fixing frame 271 is connected with a connecting rod 28 through a bearing, one end of the connecting rod 28 is fixedly connected with a second bevel gear 29, the first bevel gear 27 is engaged with the second bevel gear 29, and the middle part of the outer wall of the connecting rod 28 is connected with a spiral impeller 30 at equal intervals, wherein the driving shaft 2 drives the driving gear 15 to rotate, the driving 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 engages the second bevel gear 29, so that the axial rotation is converted into the radial rotation, so as to drive the connecting rod 28 to rotate, the connecting rod 28 drives the spiral impeller 30 to rotate and cut at high speed in the heat exchange copper pipe 17, the spiral impeller 30 applies a centrifugal thrust to the cooling liquid, generates high-pressure flow, the cooling liquid forms turbulent flow in the heat exchange copper pipe 17, so as to drive the cooling liquid to circulate and flow in the heat exchange copper pipe 17, the motor surplus kinetic energy is used for driving, the energy-saving effect is achieved compared with the independent water pump, and the installation space of the independent water pump is saved.

[0039] The inner wall of the motor shell 1 is provided with a sound insulation pad 31, the motor shell 1 and the heat dissipation rear cover 13 are provided with an air duct hole 32, and one side of the outer wall of the motor shell 1 is provided with a receiving control module 33, wherein the sound insulation pad 31 plays a sound insulation role, electromagnetic noise and rotor wind noise impact the sound insulation pad 31 on the inner wall of the motor shell 1, so that the noise is gradually eliminated, the receiving control module 33 starts to receive and process signals and controls, and the air duct hole 32 plays an auxiliary heat dissipation role.

[0040] The implementation principle of the embodiment of the present application is that: first, the current input into the stator winding 9 generates a rotating magnetic field, the magnetic field penetrates the stator teeth 8, and drives the permanent magnet 4 on the rotor iron core 3 to rotate, when the driving shaft 2 drives the rotor iron core 3 to rotate, the multi-pole magnetic encoding ring 11 fixed on the rotor side generates a spatial magnetic field change, the circumferentially arranged tunnel magnetoresistance element 10 array captures the magnetic field signal in real time, and the rotor angle position is analyzed through the magnetoresistance change, simultaneously, the micro-electromechanical inertial measurement unit 12 detects the three-dimensional vibration and angular velocity of the motor, through the Kalman filtering algorithm and the magnetic position signal fusion, the detection error caused by mechanical vibration is eliminated, this process continuously outputs high-precision position data to the receiving control module 33, realizes the non-inductive FOC control, the driving shaft 2 rotates and extends the end to drive the driving gear 15 to rotate synchronously, the driving gear 15 meshes with the driven gears 16 on both sides to distribute power to the two groups of linkage shafts 14, the linkage shafts 14 drive the leaf fans 141 to rotate at high speed, the leaf fans 141 form an axial centrifugal airflow in the heat dissipation rear cover 13, the airflow penetrates the air duct holes 32 of the motor housing 1 to directly blow the surface of the stator winding 9, and at the same time, the heat is discharged along the gap of the rotor iron core 3, thereby playing a heat dissipation role, the two groups of leaf fans 141 are symmetrically arranged, and a tornado type convection is formed at the tail of the motor, the heat dissipation surface area coverage rate reaches 95%, the power is completely taken from the motor rotating shaft, and zero additional power consumption is generated, the cooling liquid flows through the heat exchange copper pipe 17, absorbs the heat of the motor through the heat exchange copper pipe 17, thereby realizing the heat dissipation work of the motor, and at the same time, the cooling liquid in the heat exchange copper pipe 17 can switch the flow inside the passive cooling chamber 19 and the active cooling chamber 20 through the switching of the three-way valve and the shunt pipe 21 during the circulation process, the driving shaft 2 rotates to drive the driving gear 15 to rotate, the driving gear 15 drives the linkage shaft 14 to rotate at high speed, the one bevel gear 27 at the end of the linkage shaft 14 meshes with the two bevel gears 29, thereby converting the axial rotation into radial rotation, thereby driving the connecting rod 28 to rotate, the connecting rod 28 drives the spiral impeller 30 to rotate and cut at high speed in the heat exchange copper pipe 17, the spiral impeller 30 applies a centrifugal thrust to the cooling liquid, generates high-pressure flow, and the cooling liquid forms a turbulent flow in the heat exchange copper pipe 17, thereby pushing the cooling liquid to circulate in the heat exchange copper pipe 17, when the motor temperature is low, the three-way valve controls the heat exchange copper pipe 17 to communicate with the passive cooling chamber 19, when the cooling liquid circulates, the cooling liquid after heat exchange flows through the temperature phase change module 22, the temperature phase change module 22 expands when heated, thereby performing heat absorption work on the cooling liquid flowing through, thereby realizing the cooling of the cooling liquid, the temperature phase change module 22 is a paraffin microcapsule, and zero energy consumption is generated to complete the basic heat dissipation, when the motor temperature gradually increases, the temperature phase change module 22 filled in the passive cooling chamber 19 expands to the final enlarged volume, thereby extruding the inner wall of the passive cooling chamber 19, thereby affecting the water flow, making the internal pressure increase, when the pressure reaches the set value through the pressure sensor 23, the three-way valve is controlled to switch the passage through the receiving control module 33, and the semiconductor refrigerator 24 is controlled to start at the same time, so that the heat exchange copper pipe 17 communicates with the active cooling chamber 20,The inside cooling liquid of the heat exchange copper pipe 17 is continuously cooled by the semiconductor refrigerator 24, a reinforced cooling closed loop is formed, the physical properties of the phase change material are converted into control signals, the electronic sensor and the water pump are replaced, the heat dissipation limit is broken through, zero perception heat dissipation is realized, and meanwhile, through the multi-stage gradient heat dissipation cooling mode, the effects of precise heat dissipation and energy saving are achieved.

[0041] The embodiments of the specific embodiment are the preferred embodiments of the application, and are not intended to limit the protection scope of the application, wherein the same parts are indicated by the same reference numerals. Therefore, equivalent changes made according to the structure, shape and principle of the application should be covered in the protection scope of the application.

Claims

1. A built-in brushless motor for a treadmill, comprising a motor housing (1), characterized in that: The center of the motor shell (1) is provided with a driving shaft (2), the driving shaft (2) and the motor shell (1) are connected by a ball bearing, the middle of the driving shaft (2) is provided with a rotor core (3) on both sides, the middle of the two groups of rotor cores (3) is provided with a permanent magnet (4), the inner wall of the motor shell (1) is connected with a stator assembly (5), the back of the stator assembly (5) is provided with a tunnel magnetic resistance element (10), one side of the rotor core (3) is fixedly connected with a multi-pole magnetic encoding ring (11), the tunnel magnetic resistance element (10) is provided with multiple groups and is equidistantly arranged, and the tunnel magnetic resistance element (10) is matched with the multi-pole magnetic encoding ring (11), one side of the tunnel magnetic resistance element (10) is provided with a micro electro-mechanical inertial measurement unit (12), and the micro electro-mechanical inertial measurement unit (12) comprises an accelerometer and a gyroscope.

2. The inner-rotating brushless motor for a treadmill according to claim 1, wherein: The stator assembly (5) comprises a stator support ring (6), a limiting clamping groove (7), a stator tooth (8) and a stator winding (9), the inner wall of the stator support ring (6) is arranged with limiting clamping grooves (7), the inside of the multiple limiting clamping grooves (7) is embedded with stator teeth (8), and the outer wall of the stator tooth (8) is wound with a stator winding (9).

3. The inner-rotating brushless motor for a treadmill according to claim 1, wherein: The end of the motor shell (1) is fixedly connected with a heat dissipation rear cover (13), the inner walls of the two sides of the heat dissipation rear cover (13) are movably connected with linkage shafts (14) through bearings, the outer wall of the middle of the linkage shaft (14) is fixedly connected with a leaf fan (141), one end of the driving shaft (2) extends to the inside of the heat dissipation rear cover (13) through the motor shell (1), and the driving shaft (2) and the heat dissipation rear cover (13) are connected through a bearing.

4. The inner-rotating brushless motor for a treadmill according to claim 3, characterized in that: The outer wall of one side of the driving shaft (2) located in the inside of the heat dissipation rear cover (13) is fixedly connected with a driving gear (15), the outer walls of one side of the two groups of linkage shafts (14) are fixedly connected with driven gears (16), and the driving gear (15) and the two groups of driven gears (16) are meshed with each other.

5. The inner-rotating brushless motor for a treadmill according to claim 3, wherein: The inner wall of the motor shell (1) is connected with a heat exchange copper pipe (17), one side of the top of the motor shell (1) is fixedly connected with a cold water box (18), one side of the inside of the cold water box (18) is provided with a passive cooling chamber (19) and an active cooling chamber (20), and the two ends of the heat exchange copper pipe (17) are connected with shunt pipes (21) through three-way valves, and the shunt pipes (21) are provided with two groups, and the two groups of shunt pipes (21) are respectively communicated with the passive cooling chamber (19) and the active cooling chamber (20).

6. The inner-rotating brushless motor for a treadmill according to claim 5, wherein: The inside of the heat exchange copper pipe (17), the passive cooling chamber (19) and the active cooling chamber (20) is provided with cooling liquid, the inside of the passive cooling chamber (19) is filled with a temperature phase change module (22), and the inner wall of the passive cooling chamber (19) is provided with a pressure sensor (23).

7. The inner-rotating brushless motor for a treadmill according to claim 6, wherein: The inner wall of the active cooling chamber (20) is provided with a semiconductor refrigerator (24), the refrigeration end of the semiconductor refrigerator (24) is in close contact with the active cooling chamber (20), the heat dissipation end is arranged outside the active cooling chamber (20), and the inside of the heat exchange copper pipe (17) is embedded with a temperature sensor (25).

8. The inner-rotating brushless motor for a treadmill according to claim 7, wherein: One side of the heat exchange copper pipe (17) penetrates into the inside of the heat dissipation rear cover (13), one side of the linkage shaft (14) penetrates into the middle of the heat exchange copper pipe (17), the linkage shaft (14) is connected with the heat exchange copper pipe (17) through a sealing bearing, and the connection between the linkage shaft (14) and the heat exchange copper pipe (17) is provided with a sealing ring (26).

9. The inner turning brushless motor for a treadmill according to claim 8, wherein: The linkage shaft (14) is fixedly connected with a first bevel gear (27) on one side of the outer wall in the heat exchange copper pipe (17), a fixed frame (271) is arranged on one side of the inner wall of the heat exchange copper pipe (17), a connecting rod (28) is connected with the middle of the fixed frame (271) through a bearing, a second bevel gear (29) is fixedly connected with one end of the connecting rod (28), the first bevel gear (27) is engaged with the second bevel gear (29), and helical impellers (30) are arranged at equal intervals on the outer wall of the middle of the connecting rod (28).

10. The inner-rotating brushless motor for a treadmill according to claim 8, wherein: The inner wall of the motor shell (1) is surrounded by a sound insulation pad (31), the motor shell (1) and the heat dissipation rear cover (13) are provided with an air duct hole (32), and the outer wall of one side of the motor shell (1) is provided with a receiving control module (33).

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