Embedded motor training piece capable of directly winding and unwinding rope and used for strength training instrument

Abstract

According to the scheme, the embedded motor training piece capable of directly winding and unwinding the rope for the strength training instrument comprises a motor assembly used for providing a resistance source, the motor assembly comprises a stator and a rotor which are matched with each other, a rotor iron core in the rotor is composed of a plurality of punching sheets which are overlapped with each other, and the punching sheets are arranged in the motor assembly. The outer periphery of each punching sheet is provided with a plurality of transition magnetic bridges arranged at equal intervals along the circumferential direction, the inner side of each transition magnetic bridge is provided with a corresponding magnet hole, the plurality of magnet holes are arranged at equal intervals along the circumferential direction of the punching sheet, and the side of each magnet hole forms a magnetic isolation bridge communicated with the magnet hole. Pole arc sections are formed at the connection positions of the adjacent transition magnetic bridges, and the magnets are embedded into the corresponding magnet holes; and the tension assembly comprises a winder fixed on the output shaft of the motor assembly and a rope with one end fixed on the winder, and the operation characteristics of high response speed of winding and unwinding the rope, smooth motor operation, low noise and the like are integrated.

Description

Technical Field

[0001] This invention relates to the field of strength training, and in particular to an embedded motor training component for strength training equipment that allows for direct retraction and extension of ropes. Background Technology

[0002] With the increasing awareness of fitness, strength training is becoming increasingly important in the fitness field. Traditional strength training equipment relies on weight blocks for weight adjustment. Whenever the training intensity needs to be adjusted, the weight of the weight blocks must be readjusted. This method is not only cumbersome and seriously affects the convenience of training, but also cannot achieve electronic recording and intelligent analysis of training data, making it difficult to meet the modern fitness enthusiasts' pursuit of scientific and efficient training.

[0003] A new technology that uses precise motor torque control to manipulate resistance, and then achieves strength training through the winding and unwinding of ropes, overcomes the shortcomings of traditional weighted exercises and is rapidly gaining traction in the strength training industry. Currently, the mainstream solution in the market is the external rotor strength training motor. However, due to the excessive rotational inertia of the external rotor, the motor's response is sluggish when the trainee is winding and unwinding the rope, which has become a key factor limiting its performance improvement. Specifically, when the trainee quickly winds and unwinds the rope, the motor cannot respond promptly due to the rotational inertia of the external rotor, resulting in a noticeable lag. This lag not only affects the rhythm of the training but may also cause the trainee to lose balance during rapid movements, significantly reducing the user experience and potentially even posing safety hazards.

[0004] To address the shortcomings of external rotor motors, internal rotor motors have been introduced into the field of strength training. While internal rotor motors do offer significant advantages in response speed and can alleviate lag issues during rope retraction and release to some extent, current strength training solutions using internal rotor motors still face the challenge of effectively suppressing cogging torque fluctuations. This is because the stator cogging magnetic field and rotor magnet magnetic field interact within the motor. As the rotor rotates, the relative positions between the stator teeth and rotor slots constantly change, causing periodic changes in the air gap permeability. This periodic change in air gap permeability induces an electromotive force in the motor windings, leading to fluctuations in cogging torque.

[0005] Cogging torque fluctuations cause uneven torque output during motor operation, resulting in unstable resistance during training and thus affecting training effectiveness. Specifically, strength trainees expect stable and predictable resistance feedback with each exertion. However, due to the cogging torque fluctuations in the internal rotor motor, trainees will notice significant changes in resistance when retracting or extending the rope or performing other movements. For example, during dumbbell curl simulations, the initially uniform exertion will encounter fluctuating resistance. This unstable resistance easily disrupts the trainee's rhythm, making it difficult to concentrate and complete the exercise, severely damaging the smoothness and continuity of the training, and greatly reducing the user's experience in strength training. Furthermore, unstable resistance can also cause trainees to lose balance during the exercise. For example, during high-intensity training, the change in resistance caused by the coarse gear torque can lead to strong arm vibrations. Trainees may lose control of their body posture, which could result in accidents. This could not only cause physical injury to the trainee but also threaten the safety of other gym-goers and seriously disrupt the normal operation of the gym.

[0006] Furthermore, because the torque coefficient of an internal rotor motor is lower than that of an external rotor motor, a differential is often used to amplify the motor torque in order to meet the higher torque requirements of strength training. However, while this approach increases torque to some extent, it greatly weakens the inherent advantage of the internal rotor motor's rapid response. At the same time, the use of a differential also significantly increases the noise of the motor during operation, greatly affecting the comfort of the fitness environment.

[0007] Therefore, the strength training equipment currently on the market may have many problems such as slow cable release and retraction response, uneven motor operation, and loud motor noise. Summary of the Invention

[0008] The purpose of this invention is to provide an embedded motor training component for strength training equipment that allows for direct rope retraction and extension. This component combines rapid rope retraction and extension response, smooth motor operation, and low noise, overcoming the technical bottlenecks of traditional strength training equipment and promoting the high-performance development of strength training equipment.

[0009] To achieve the above objectives, this technical solution provides an embedded motor training component for strength training equipment, which allows for direct cable retraction and extension, comprising:

[0010] A motor assembly for providing a resistance source, wherein the motor assembly includes a stator and a rotor that cooperate with each other. The rotor core of the rotor is composed of multiple stacked laminations. Each lamination has multiple transition magnetic bridges arranged at equal intervals along the circumferential direction on its outer periphery. Each transition magnetic bridge has a corresponding magnet hole on its inner side. The multiple magnet holes are arranged at equal intervals along the circumferential direction of the lamination. The side of each magnet hole forms a magnetic isolation bridge that communicates with the magnet hole. The contact position of adjacent transition magnetic bridges forms a pole arc segment. The magnet is embedded in the corresponding magnet hole.

[0011] The tension assembly includes a winder fixed to the output shaft of the motor assembly and a rope with one end fixed to the winder.

[0012] Compared with existing technologies, this technical solution has the following characteristics and beneficial effects:

[0013] 1. Significantly improved response speed of tension rope retraction and release: This solution uses an internal rotor motor, which has a smaller moment of inertia compared to traditional external rotor strength training motors. Furthermore, the motor output shaft directly drives the winder to retract and release the rope, eliminating intermediate transmission links such as gear reducers and reducing energy loss and transmission delay. Moreover, through optimization of the rotor core structure, such as the addition of weight-reducing holes to significantly reduce the rotor's moment of inertia, the rotor can respond to the motor's drive commands more quickly, thereby achieving rapid retraction and release of the tension rope and greatly improving the response speed of rope retraction and release during training.

[0014] 2. Significantly Improved Motor Operation Smoothness: The meticulous design of the transition magnetic bridge, isolation magnetic bridge, and pole arc segment in the rotor core of this solution optimizes the sinusoidal nature of the air gap magnetic field, resulting in a more uniform magnetic field distribution. Furthermore, the precise fit between the magnets and their holes, along with the symmetrically arranged transition magnetic bridges, ensures uniform magnetic flux distribution throughout the motor assembly, effectively reducing cogging torque and torque pulsation. In addition, the high-precision fit between the output shaft and the center hole ensures rotor stability during high-speed operation, reducing vibrations caused by shaft misalignment. These factors combined result in smoother motor operation, providing trainees with stable tension output.

[0015] 3. Significantly reduced motor operating noise: The embedded structure of the transition magnetic bridge and magnets greatly optimizes the air gap magnetic field, reducing cogging torque and torque pulsation. This fundamentally reduces vibration caused by an imperfect magnetic field during motor operation, thereby reducing resonance noise between mechanical components. Simultaneously, the motor structure design incorporates a rational pole arc segment plus transition magnetic bridge design, further reducing the source of noise generation. Furthermore, the high-precision fit between the output shaft and the center hole, along with the rotor's weight-reducing design, reduces vibration noise caused by eccentricity and excessive rotational inertia, creating a quiet training environment for users. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the rotor core of the embedded motor training component for strength training equipment provided in this solution, which allows for direct rope retraction and extension.

[0017] Figure 2 This is a schematic diagram of the rotor of the embedded motor training component for strength training equipment provided in this solution, which allows for direct cable retraction and extension.

[0018] Figure 3 This is a schematic diagram of the stator assembly of the embedded motor training component for strength training equipment provided in this solution, which allows for direct cable retraction and extension.

[0019] Figure 4 This is an exploded view of the motor assembly of the embedded motor training component for strength training equipment provided in this solution, which allows for direct rope retraction and extension.

[0020] Figure 5 This is a schematic diagram of the overall cross-section of the embedded motor training component for strength training equipment provided in this solution, which allows for direct rope retraction and extension.

[0021] Figure 6 This is a schematic diagram of the winding mechanism for the embedded motor training component of the strength training equipment provided in this solution, which allows for direct rope retraction and extension.

[0022] Figure 7 This is a schematic diagram illustrating the usage status of the embedded motor training component with directly retractable ropes for strength training equipment provided in this solution.

[0023] Figure 8 This is another usage diagram of the embedded motor training component for strength training equipment provided in this solution, which allows for direct cable retraction and extension.

[0024] Figure 9 This is a schematic diagram of the structure of a movable pulley block according to an embodiment of this solution.

[0025] Figure 10 This is a structural schematic diagram of an application scenario of an embedded motor training component, which is one embodiment of this solution.

[0026] Figure 11 This is a schematic diagram of the wire stopper in one embodiment of this solution.

[0027] In the diagram: 10-Stator assembly; 11-Stator core; 12-Coil frame; 13-Insulating paper; 14-Enameled wire; 20-Rotor assembly; 21-Transition magnetic bridge; 22-Magnet hole; 23-Magnetic isolation bridge; 24-Pole arc segment; 25-Cross-axis segment; 26-Magnet; 27-Weight reduction hole; 28-Center hole; 29-Output shaft; 30-Tension assembly; 31-Winder; 32-Rope; 40-Outer shell; 41-Carrier housing; 42-Rear end cover; 43-Front end cover; 50-Magnetic encoder; 51-Magnetic encoder sensor chip printed circuit board; 52-Magnetic component; 53-Magnetic component fixing seat; 54-Cover; 60-Wire stopper; 70-Moving pulley block; 71-Moving pulley fixing block; 72-Moving pulley; 73-Connector; 74-Pull wire; 81-Lead wire. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0029] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0030] Example 1

[0031] like Figure 4 As shown, this solution provides an embedded motor training component for strength training equipment with directly retractable ropes, comprising:

[0032] A motor assembly for providing a resistance source, wherein the motor assembly includes a stator assembly 10 and a rotor assembly 20 that cooperate with each other. The rotor core of the rotor assembly 20 is composed of multiple stacked laminations. Each lamination has multiple transition magnetic bridges 21 arranged at equal intervals along the circumferential direction on its outer periphery. Each transition magnetic bridge 21 has at least one corresponding magnet hole 22 on its inner side. The multiple magnet holes 22 are arranged at equal intervals along the circumferential direction of the lamination. Each magnet hole 22 forms a magnetic isolation bridge 23 connected to the magnet hole 22 on its side. The contact position of adjacent transition magnetic bridges 21 forms a pole arc segment 24. A magnet 26 is embedded in the corresponding magnet hole 22.

[0033] The tension assembly 30 includes a winder 31 fixed to the output shaft of the motor assembly and a rope 32 with one end fixed to the winder 31.

[0034] It should be noted that this solution uses an internal rotor motor with embedded magnets as the resistance source of the strength training equipment. Through the reasonable setting of the transition magnetic bridge and the embedded magnets, the sinusoidal nature of the air gap magnetic field is effectively improved without reducing the torque of the internal rotor motor. This reduces the cogging torque and torque pulsation, thereby reducing the vibration and noise during motor operation and improving the smoothness of motor operation, which greatly enhances the training experience of strength trainees.

[0035] Specifically, such as Figure 1 As shown, the transition magnetic bridges 21 located on both sides of the same pole arc segment 24 are symmetrically arranged to form a transition bridge. In other words, multiple pairs of transition bridges are formed on the outer periphery of the laminations of the rotor core, which are connected along the circumferential direction. The two transition magnetic bridges 21 in each transition bridge are symmetrically distributed along the two ends of the pole arc segment 24.

[0036] It is important to emphasize that the symmetrical distribution of the two transition magnetic bridges 21 along both ends of the pole arc segment 24 in each transition bridge means that the shape and position of the two transition magnetic bridges 21 are symmetrical with respect to the pole arc segment 24. This ingenious layout, based on electromagnetic principles, can further optimize the sinusoidal nature of the air gap magnetic field. In other words, this scheme, through rigorous electromagnetic simulation calculations and mechanical simulation analysis, designs the transition magnetic bridges 21 and pole arc segments 24, ensuring that the two transition magnetic bridges 21 in each transition bridge are strictly symmetrical with respect to the pole arc segment 24. This highly symmetrical design, based on Maxwell's equations and the principles of mechanics of materials, greatly improves the uniformity of the sinusoidal nature of the air gap magnetic field, making the magnetic flux distribution more uniform throughout the motor assembly. This results in a more uniform distribution of cogging torque and torque pulsation, further enhancing the optimization effect on cogging torque and torque pulsation. This solution optimizes the magnetic field to produce a more stable electromagnetic torque output from the motor, resulting in a more stable tension transmitted to the rope during resistance training. This allows trainees to precisely control the tension and training intensity, effectively stimulating muscles according to the training plan without experiencing sudden changes in resistance. Users are also free from vibration and noise interference, greatly improving training comfort and smoothness, and enhancing the overall training experience.

[0037] It should be noted that the magnet hole 22 in this solution is located inside the transition magnetic bridge 21. This is different from the method of attaching the magnet to the outer periphery of the rotor, which allows for more precise control of the magnetic flux of the motor. If the magnet is attached externally, the air gap magnetic field of the external magnet is much more complex, making it difficult to achieve the optimal sine of the air gap magnetic field even if the magnet shape and iron core shape are optimized. Moreover, the method of attaching the magnet externally will also result in a less tight bond between the magnet and the iron core, leading to larger and uneven distribution of cogging torque and torque pulsation during motor operation.

[0038] In some embodiments, this solution, through the reasonable setting of the size of the transition magnetic bridge 21, ensures that when the magnet 26 is wrapped inside the transition magnetic bridge 21, the magnet 26 has sufficient mechanical strength while ensuring the effective transmission of magnetic flux, effectively preventing the magnet from loosening during motor operation, and improving the reliability and service life of the motor.

[0039] In some embodiments, and considering the diversity of practical application scenarios, users can flexibly select different design schemes for the number of transition magnetic bridges 21 according to specific needs. This feature greatly enhances the structural flexibility and diversity of rotor laminations, meeting the differentiated requirements for motor performance in different application scenarios. For example, in higher precision force training equipment, the number of transition magnetic bridges 21 can be increased to achieve a smaller cogging torque effect. It should be noted that in actual design, the rotor can be designed with different numbers of magnets 26, and correspondingly, the number of transition magnetic bridges 21 is also adjusted accordingly.

[0040] In some embodiments, the outer periphery of the pole arc segment 24 is recessed towards the center of the lamination relative to the transition magnetic bridges 21 on both sides. The arc design of the pole arc segment 24 allows the rotor core to generate a more uniform and stable magnetic field during rotation, improving the smoothness of motor operation. It can also change the magnetic circuit structure to better guide the magnetic flux, thereby further optimizing the sinusoidal nature of the air gap magnetic field. In other words, this recessed design is to match the outer arc shape of the transition magnetic bridge 21 so that the magnetic field formed by adjacent magnets 26 transitions uniformly.

[0041] In some embodiments, the shape of the transition magnetic bridge 21 can be varied, including but not limited to arc, square or conical, and the specific shape can be flexibly determined according to actual needs and performance optimization goals.

[0042] In embodiments of this solution, such as Figure 1As shown, the transition magnetic bridge 21 adopts an arc-shaped design. This shape can improve the linearity of magnetic field transmission while ensuring effective transmission of magnetic flux, thereby optimizing the air gap magnetic field. It is especially suitable for applications with high requirements for magnetic field uniformity. In other embodiments, the transition magnetic bridge 21 is designed as a cone shape, which has unique advantages in terms of magnetic flux concentration and dispersion, and can be selected according to specific magnetic field distribution requirements.

[0043] In some embodiments, the transition magnetic bridge 21 is an arc surface that bends toward the outside of the rotor core. When the motor is running, it can make the air gap magnetic field distribution more regular and uniform, and optimize the sinusoidal degree of the air gap magnetic field. The pole arc segment 24 between the two transition magnetic bridges 21 is an arc surface that bends toward the inside of the rotor core, so that the magnetic flux distribution inside the motor is more reasonable, thereby effectively reducing cogging torque and torque pulsation, reducing vibration and noise during motor operation, and improving the operating efficiency and stability of the motor.

[0044] In this design, the magnet holes 22 are arranged in an array along the circumference of the rotor core, and each magnet hole 22 is equidistant from the center of the rotor core. This method allows the magnets 26 to be evenly distributed on the rotor core, ensuring the uniformity of the magnetic field distribution and thus improving the overall performance of the motor.

[0045] In some embodiments, the shape of the magnet hole 22 matches the shape of the magnet 26, and can be designed as any of square, arc, and conical shapes. The shape selection here is mainly determined based on the shape of the magnet 26 and the magnetic performance optimization requirements of the motor. However, it should be noted that the magnet holes 22 on the same rotor core have the same shape and size.

[0046] In embodiments of this solution, such as Figure 1 As shown, the shape of the magnet hole 22 is designed to be square or square-like with curved edges, so as to achieve precise matching with the square magnet 26 and maximize the magnetic performance of the magnet.

[0047] In some embodiments, magnets 26 are embedded one-to-one into magnet holes 22. In some embodiments, magnets 26 are square in shape, preferably square magnets without chamfers, but magnets 26 with slight chamfers can also be selected according to actual conditions. The chamfer-free magnets 26 can fit tightly into the magnet holes 22, better withstand the electromagnetic force and centrifugal force during motor operation, and are not easily displaced or shaken under high-speed rotation, ensuring stable motor operation, thereby reducing magnetic flux leakage, optimizing the sine of the air gap magnetic field, and compared with magnets of other structures, square magnets can more effectively guide magnetic flux, making the air gap magnetic field distribution of the motor more uniform, reducing cogging torque and torque pulsation, thereby reducing the tension fluctuation transmitted to the rope, allowing the trainee to accurately control the tension, stimulate muscles according to plan, and improve training effect.

[0048] In some embodiments, magnet 26 is made of neodymium iron boron.

[0049] In some embodiments, the magnet hole 22 is located close to the outer periphery of the transition magnetic bridge 21. This has the advantage that the magnetic flux can be conducted through the transition magnetic bridge 21 more efficiently, and the transition magnetic bridge 21 can provide additional support for the magnet, reducing the risk of displacement of the magnet 26. This design improves the stability and reliability of motor operation.

[0050] Furthermore, magnetic isolation bridges 23 are formed on both sides of each magnet hole 22, and the two magnetic isolation bridges 23 are symmetrically arranged with respect to the radial central axis of each magnet hole 22, wherein the radial central axis of the magnet hole 22 refers to the central axis of the magnet hole 22 that overlaps with the radial direction along the rotor core.

[0051] In some embodiments, the magnetic isolation bridge 23 on each magnet hole 22 can guide the direction of magnetic flux, ensuring that the magnetic flux generated by the magnet 26 is guided through the transition magnetic bridge 21 into the air gap, improving the magnetic field distribution. The magnetic isolation bridge 23 can also block the local magnetic field conflict coupling between different magnets 26. When the motor is running, the locally overlapping magnetic fields of adjacent magnets 26 may affect each other, resulting in uneven magnetic field distribution and reduced motor performance. The magnetic isolation bridge 23, through its own structural design, prevents these interferences, ensuring that the magnetic field generated by each magnet 26 is relatively independent and stable, optimizing the sinusoidal nature of the air gap magnetic field, reducing cogging torque and torque pulsation, so that the tension transmitted to the rope 32 is more stable.

[0052] In some embodiments, the magnetic isolation bridges 23 symmetrically arranged on each magnet hole 22 are arcs that bulge outward relative to the side of the magnet hole 22. Furthermore, the magnetic isolation bridges 23 are preferably located on the side of the magnet hole 22 near the transition magnetic bridge 21.

[0053] In addition, a cross-axis section 25 is provided between two adjacent magnet holes 22 in this scheme, and a magnetic isolation bridge 23 is connected to both ends of the cross-axis section 25. In other words, two adjacent transition magnetic bridges 21 are connected through the cross-axis section 25 and the magnetic isolation bridge 23, so that the adjacent transition magnetic bridges 21 are stably connected through the cross-axis section 25 and the magnetic isolation bridge 23 tightly connected to both ends of the cross-axis section 25. The pole arc section 24 and the magnetic isolation bridge 23 are effectively connected by the transition magnetic bridge 21 located outside the magnet hole 22. This carefully designed structure fundamentally solves the problems of poor sinusoidal ductility of air gap magnetic field, excessive cogging torque and torque pulsation in the prior art.

[0054] From the perspective of motor operation, the cross-axis section 25 and the magnetic isolation bridge 23 work together to effectively regulate the direction of magnetic flux. The presence of the magnetic isolation bridge 23 acts like a "checkpoint" in the magnetic circuit, precisely guiding the magnetic flux to flow along the designed path, reducing magnetic flux leakage and chaos, and significantly optimizing the sinusoidal nature of the air gap magnetic field. The cross-axis section 25 further enhances the continuity and stability of the magnetic circuit, allowing magnetic flux to be smoothly transmitted between adjacent transition magnetic bridges 21, avoiding magnetic field distortion caused by poor magnetic circuit conditions. This optimized magnetic field distribution fundamentally reduces cogging torque and torque pulsation. Reduced cogging torque means smoother motor operation, reducing unnecessary vibration and noise; reduced torque pulsation ensures more stable electromagnetic torque output from the motor. Applying this structure to tensile training comprehensively improves the overall performance of the strength training motor, providing users with a higher quality, more efficient, and quieter user experience.

[0055] Specifically, the stable electromagnetic torque output in the motor assembly ensures a consistent tension transmitted to the rope, eliminating distractions caused by sudden changes in tension and allowing trainees to focus more intently on training, completing movements at the predetermined intensity and rhythm. For example, during strength endurance training, stable tension allows trainees to exert force continuously and evenly, effectively preventing instability in training intensity due to tension fluctuations, thus improving training effectiveness. Simultaneously, this structure significantly reduces vibration and noise generated during motor operation: in a quiet training environment, trainees can better concentrate, feel muscle contraction and exertion, and improve training comfort and smoothness. Moreover, stable tension and a quiet environment reduce the risk of injury, making the training process safer and more reliable. This stable, undisturbed training condition is particularly important in training programs requiring precise force control, such as rehabilitation training or fine motor training targeting specific muscle groups, as it helps trainees control muscle movement more accurately, promoting muscle function recovery and improvement.

[0056] In some embodiments, in order to reduce the weight of the rotor assembly 20 and improve the response speed of the rotor assembly 20, weight reduction holes 27 are designed on the rotor laminations to significantly reduce the moment of inertia of the rotor assembly 20.

[0057] Specifically, the laminations of the rotor core are provided with at least a plurality of evenly distributed weight-reducing holes 27. When the laminations of the rotor core are provided with a plurality of weight-reducing holes 27, the plurality of weight-reducing holes 27 are spaced apart along the circumferential direction of the rotor core. In some embodiments, the weight-reducing holes 27 are provided inside the magnet holes 22.

[0058] Of course, a center hole 28 is provided at the center of the laminations of the rotor core. The motor assembly includes an output shaft 29 passing through the center hole 28. The tension component 30 acts directly on the output shaft 29. During the operation of the motor assembly, the output shaft 29, the rotor core, and the magnet 26 rotate synchronously, ensuring the stability and accuracy of power transmission. The high-precision fit design between the output shaft 29 and the center hole 28 ensures the stability and accuracy of the rotor assembly 20 during high-speed operation, effectively reducing vibration and noise caused by shaft misalignment, and improving the overall reliability and service life of the motor assembly. For example, during operation, the precisely fitted output shaft 29 and center hole 28 can ensure the concentricity of the rotor assembly 20, avoiding additional vibration and energy loss caused by eccentricity.

[0059] like Figure 3 As shown, the stator assembly 10 in the motor assembly of this scheme is a conventional design and will not be described in detail here. The stator assembly 10 includes a stator core 11, a coil frame 12, insulating paper 13, and enameled wire 14. The stator core 11 is composed of multiple stacked laminations, with stator slots evenly distributed on the laminations. The coil frame 12 is interlocked with the stator slots. The insulating paper 13 is located between the stator core 11 and the insulating frame 12. The enameled wire 14 is wound around the coil frame 12. The rotor assembly 20 is located inside the stator assembly 10, and the magnets 26 on the laminations of the rotor core are alternately magnetized according to N and S. Each magnet 26 forms a magnetic pole, and adjacent N and S magnetic poles form a pole pair.

[0060] When the motor assembly is energized, current flows through the enameled wire 14 of the stator assembly 10. According to Ampere's law, a rotating magnetic field is generated around the stator core 11. At this time, the magnet 26 embedded on the rotor core is subjected to electromagnetic force under the action of this rotating magnetic field, thereby generating electromagnetic torque. Since the magnet 26 is tightly connected to the rotor core, the electromagnetic force drives the rotor core to rotate around the shaft. By optimizing the number of stator slots to correspond to the design of the number of magnet pole pairs in the rotor, the special structure of the rotor core, in this process, optimizes the sine of the air gap magnetic field in the interaction between it and the magnetic field generated by the stator assembly 10, reduces cogging torque and torque pulsation, and ensures that the rotor assembly 20 can rotate smoothly and efficiently, thereby providing a smooth and noiseless resistance source for tension training.

[0061] In some embodiments, such as Figure 2 As shown, the motor assembly of this solution includes a housing 40, which is composed of a housing 41, a rear end cover 42 and a front end cover 43. The rotor assembly 20 is disposed inside the stator assembly 10 and then fixed to the inside of the housing 41. The rear end cover 42 is tightly connected to the rear end of the housing 41, and the front end cover 43 is securely connected to the front end of the housing 41 to form a complete motor assembly.

[0062] In some embodiments, such as Figure 3 and Figure 4 As shown, a magnetic encoder 50 is additionally designed on the stator assembly 10. The magnetic encoder 50 includes a magnetic encoder sensor chip printed circuit board 51, a magnetic component 52, a magnetic component mounting base 53, and a protective cover 54. The magnetic encoder sensor chip printed circuit board 51 is fixed in a sedimentation manner and embedded in the middle position of the rear end cover 42. A magnetic component 52 is installed at one end of the output shaft 29. The magnetic component 52 and the magnetic encoder sensor chip printed circuit board 51 are coaxially aligned. The magnetic encoder sensor chip printed circuit board 51 is provided with a protective cover 54. The set distance between the magnetic component 52 and the magnetic encoder sensor chip printed circuit board 51 is precisely controlled. This distance range is carefully designed to ensure that the magnetic encoder 50 accurately detects the operating status of the motor. By precisely calculating the magnetic induction angle of the output shaft 29, precise control of the torque for force training can be achieved.

[0063] In some embodiments, the magnetic element 52 is fixed to the end of the output shaft by a low-permeability wrapper.

[0064] It should be noted that the embedded motor training device with directly retractable ropes provided in this solution is directly used for strength training. Correspondingly, such as... Figure 5 As shown, the cable winder 31 on the tension assembly 30 of this solution is fixed to the output shaft 29. The trainee holds one end of the rope 32 and pulls directly. When the motor assembly is powered on, the output shaft 29 drives the cable winder 31 to rotate and wind the rope. The trainee pulls the free end of the rope 32 against the tension of the output shaft 29, thereby exercising the muscle strength of the arms, shoulders, back, etc. For example, a simple straight-arm rope pulling exercise can be performed: stand firmly with both feet, hold the rope with both hands, and pull straight back, feeling the muscle contraction and exertion, which can effectively enhance the muscle strength of the arms and back.

[0065] In some embodiments, the winding device 31 is sleeved on the output shaft 29 and coaxially arranged with the output shaft 29 to facilitate force transmission. Furthermore, the winding device 31 and the output shaft 29 are securely connected to each other by means of keyways, protruding clips, or screws.

[0066] In one specific embodiment, such as Figure 6 As shown, the winding device 31 is designed as a combination of a screw, a flexible connector, and a winding wheel. At this time, the output shaft 29 drives the screw to rotate, and the screw then drives the winding wheel. The winding wheel and the screw are displaced in the relative horizontal direction through the rotation of the shaft, thereby realizing the winding wheel rotation mode of winding and unwinding.

[0067] In order to avoid irregular arrangement of the ropes wound on the winder 31, in some embodiments, anti-rope slippage barriers are provided on both sides of the winder 31, and a winding space for the rope 32 to be wound is formed between the anti-rope slippage barriers.

[0068] Furthermore, the winder 31 in this design is a cylindrical shape with a uniform diameter, or the winding space is designed as a cylindrical shape with a uniform diameter, so that the rope 32 can be evenly wound on the winder 31. The uniform diameter design ensures that the distance from each turn of the rope 32 to the output shaft 29 is equal during winding and unwinding. According to the lever principle, this keeps the torque output by the motor constant when converted into rope tension. When the trainee pulls the rope 32, there will be no jerking due to uneven tension, allowing for stable strength training, precise control of training intensity, and effective stimulation of the target muscle groups. In addition, the uniform winding of the rope 32 avoids rotor center of gravity shift caused by uneven distribution of the rope 32.

[0069] To avoid unnecessary impact caused by the rope 32 falling vertically, in some embodiments, this solution provides a rope guide 60 on the motor assembly located on one side of the output shaft 29, and the rope guide 60 is located below the winder 31 and directly opposite the rope 32.

[0070] Specifically, if the rope 32 is pulled upwards relative to the winder 31, then the rope stopper 60 is located below the winder 31, that is, the rope stopper 60 is positioned on the side of the winder 31 opposite to the direction in which the rope 32 is pulled. The advantage of this arrangement is that when the rope 32 becomes slack due to gravity or other unforeseen circumstances, the rope stopper 60 can directly intercept the falling rope 32.

[0071] Preferably, the rope guide 60 is fixed on the front end cover 43 of the motor assembly and located on the side of the output shaft 29, and the rope guide 60 is arranged in the same direction as the output shaft 29.

[0072] In order to catch the entire falling rope 32, the receiving surface on the rope stopper 60 is larger than the vertical projection surface of the rope 32, so that the rope 32 can be fully caught. In addition, preferably, the receiving surface on the rope stopper 60 is designed as a concave guide surface to better catch the rope 32 that may fall.

[0073] In some embodiments, one end of the rope 32 is fixed to the winder 31, while the other end is a free end for the trainee to pull. Specifically, the ropes 32 are arranged adjacent to each other on the outer circumferential surface of the winder 32. This ensures that the tension on each rope segment is uniform, preventing sudden changes in tension due to variations in the spacing of the ropes 32 as the winder 31 rotates. When the trainee pulls the rope for strength training, they receive stable resistance, allowing for precise control of training intensity, effective muscle stimulation, and avoiding poor training results or the risk of injury due to unstable tension.

[0074] It should be noted that in some embodiments, the trainee directly applies force to the free end of the rope 32 to pull the rope 32 to complete the strength training; in other embodiments, the trainee indirectly applies force to the free end of the rope 32 to pull the rope 32 to complete the strength training.

[0075] When the trainee directly applies force to the free end of rope 32 to pull it, the free end of rope 32 is connected to a handle, allowing the trainee to hold the rope 32 and perform rope winding and coiling actions to move the rope. Of course, in some cases, the tension assembly 30 additionally includes at least one fixed pulley fixed to the strength training equipment to change the direction of the rope 32's pull. In this case, the free end of rope 32 passes through the fixed pulley, its pull direction is changed, and then it is pulled by the trainee. The specific setting of the fixed pulley can be adjusted according to the actual strength training equipment.

[0076] When the trainee indirectly applies force to the free end of the rope 32 to pull the rope 32, the tension assembly 30 includes a secondary guide connected to the rope 32. The trainee pulls the rope 32 through the secondary guide to achieve tension training.

[0077] In some embodiments, the free end of the rope 32 and the secondary guide are connected by binding, or the free end of the rope 32 is designed as a ring buckle and connected to the secondary guide through the ring buckle.

[0078] In some embodiments, the secondary guide is a movable pulley group consisting of at least one movable pulley, and the free end of the rope 32 is fixed to the movable pulley group. The trainee indirectly acts on the rope 32 and the motor assembly by pulling the movable pulley group.

[0079] Specifically, in the embodiments of this solution, the design of the movable pulley block provided by this solution is as follows: Figure 9 As shown, the movable pulley block 70 includes a movable pulley fixing block 71 and a movable pulley 72 disposed inside the movable pulley fixing block 71. A connector 73 is provided at the bottom of the movable pulley fixing block 71. A pull line 74 passes through the movable pulley 72 to pull the movable pulley 72. A rope 32 is connected to the connector 73.

[0080] Specifically, the movable pulley fixing block 71 forms a receiving space with a one-way opening to accommodate the movable pulley 72. The movable pulley 72 is fixed in the receiving space and there is a gap between it and the movable pulley fixing block 71, so that the pull cable 74 can be wrapped around the outer periphery of the movable pulley 20 to pull the movable pulley 20. More specifically, the pull cable 74 is wrapped around the outer periphery of the movable pulley 72, and both ends of the pull cable 74 extend from the opening of the receiving space for the trainee to pull.

[0081] In some embodiments, the movable pulley fixing block 71 is provided with at least one through hole for the guide rail to pass through. The guide rail is either a rigid guide rail or a flexible guide rail. When the guide rail is a flexible guide rail, it is a non-rigid guide rail, that is, a deformable guide rail, or a deformable rope guide rail. The material is selected from metal wire, various fiber materials, stainless steel wire, or any combination thereof. When the guide rail is a rigid guide rail, the number of rigid guide rails can be one or two or more, without particular limitation.

[0082] In some embodiments, the movable pulley block of this solution has one and only one movable pulley 72.

[0083] The same pull wire 74 is wound around the outer periphery of the movable pulley 72 to cooperate with the movable pulley 72. In some other embodiments, the movable pulley group is provided with two or more movable pulleys 72, and the same pull wire 74 is wound around the outer periphery of multiple movable pulleys 72 in sequence to cooperate with the movable pulleys 72. Preferably, the multiple movable pulleys 72 are symmetrically arranged.

[0084] In some embodiments, the rope 32 is connected to a connector 73 on the side of the movable pulley fixing block 70 away from the movable pulley 72, thereby establishing a force transmission relationship between the movable pulley system and the resistance source. Preferably, the connector 73 is located on the central axis of the movable pulley fixing block 70. The central axis arrangement allows the force to be distributed more evenly on the movable pulley system. When the trainee pulls the cable, the force is transmitted to the rope 32 through the action of the movable pulley system, which also helps to improve the stability of the movable pulley system during sliding. During tension training, the movable pulley system needs to slide stably along the flexible guide rail.

[0085] It should be noted that in this embodiment, the movable pulley block may not have a guide rail or may have an additional through hole for the flexible or rigid guide rail to pass through, with the guide rail serving a guiding function.

[0086] In other embodiments, such as Figure 10 As shown, the secondary guide is a pulley system consisting of at least one movable pulley. The rope 32 passes through the movable pulley, and its other end is fixed to the motor or the overall structure. The lead wire 81 fixed to the pulley system is pulled by the trainee. In other words, the free end of the rope 32 passes through the pulley system and is fixed and immovable. It is then pulled by the trainee through the secondary lead wire 81 on the pulley system, indirectly achieving the rope release and retraction method at the user end. The advantage of this is that pulling the pulley can provide double the pulling force. Of course, the lead wire 81 fixed to the pulley system can be directly connected to a handle or lever, or other user terminal components.

[0087] It should be noted that in this embodiment, the movable pulley block may not have a guide rail or may have an additional through hole for the flexible or rigid guide rail to pass through, with the guide rail serving a guiding function.

[0088] Specifically, one end of rope 32 is fixed to winder 31, and the other end passes through at least one movable pulley and is fixed to the motor or the overall structure. The movable pulley is connected to lead wire 81 through a fixed bracket. Lead wire 81 pulls the movable pulley outward, thereby driving the movement of rope 32. At this time, the free end of the wire is available for the trainee to pull. It should be noted that the winding wire inside the movable pulley and rope 32 can be connected as one whole or as two separate wires. When the winding wire inside the movable pulley and rope 32 are connected as one wire, rope 32 is fixed to the motor or the overall structure after passing over the movable pulley. When the winding wire inside the movable pulley and rope 32 are connected through two or more wires, after rope 32 is connected to the winding wire on the movable pulley, the other end of the connecting rope is then fixed to the motor or the overall structure.

[0089] To facilitate stable pulling of the rope 32, through holes are provided at the base of both ends of the winder 31. The rope passes through the through holes at both ends of the winder 31, through the internal holes or space in the same direction as the output shaft 29, and exits from the side to be fixed to the winder 31. Figure 6 As shown, in some embodiments, one end of the rope 32 passes through the through hole on the outer side of the winder 31 and is knotted to form a locking head, thereby fixing one end of the rope 32 to the winder 31; alternatively, a through hole larger than the diameter of the rope 32 is opened on the outer side of the winder 31 close to the root of the outer circumference of the winder 31. In this case, the rope 32 is passed through the hole, and then a bend of about 45° is made to fix it to the outer side of the guide shaft parallel to the output shaft 29.

[0090] To facilitate positioning and pulling of the rope 32, in some embodiments, the tension component 30 of this solution additionally includes a bracket (not shown in the figure) sleeved on the outer periphery of the winder 31. The two ends of the bracket are fixed to the motor assembly or the whole structure. A rope outlet is formed on the bracket, and the rope 32 is led out from the rope outlet.

[0091] The bracket in this design serves as the outer fixing structure of the winder 31. It forms a stable support by overlapping its two ends with the motor assembly. Its core function is to fix the originally free-moving rope exit position, forming a standardized exit path. In some embodiments, the bracket is designed as a U-shaped metal frame, with both ends fixed to the front cover, motor housing, or upper part of the motor structure by bolts. The rope exit port on the bracket is designed as a guide ring or slit structure, with a width slightly larger than the diameter of the rope 32.

[0092] like Figure 7 and Figure 8 As shown, Figure 7 and Figure 8 These are two usage diagrams showing the embedded motor training component with directly retractable ropes provided in this solution for strength training equipment in training mode. It can be seen that the trainee can directly pull the rope 32 to resist the resistance of the motor component to achieve the effect of tensile training. According to the test, the resistance range of this solution during strength training can be 0.5KG~120KG.

[0093] In summary, the embedded motor training component for strength training equipment provided in this solution, featuring directly retractable ropes, offers significant advantages in the field. Its unique rotor core structure, through the rational design of transition magnetic bridges, magnet holes, and magnetic isolation bridges, optimizes the sine wave of the air gap magnetic field, reduces cogging torque and torque pulsation, minimizes motor vibration and noise, and outputs stable electromagnetic torque. This ensures stable rope tension, allowing trainees to precisely control training intensity, effectively stimulate muscles, and prevent injury. Diverse winding designs and reasonable rope fixation and arrangement further guarantee smooth and comfortable training. This training component comprehensively enhances the strength training experience, provides strong technical support for professional strength training equipment and home fitness equipment, and powerfully promotes the development of the strength training equipment industry.

[0094] Those skilled in the art should understand that the technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0095] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An inline motorized training piece for a strength training machine that directly retracts a cable, characterized by, include: The motor assembly used to provide a resistance source includes a stator assembly (10) and a rotor assembly (20) that cooperate with each other. The rotor core of the rotor assembly (20) is composed of multiple stacked laminations. Each lamination has multiple transition magnetic bridges (21) arranged at equal intervals along the circumferential direction on its outer periphery. Each transition magnetic bridge (21) has a corresponding magnet hole (22) on its inner side. The multiple magnet holes (22) are arranged at equal intervals along the circumferential direction of the lamination. Each magnet hole (22) has a magnetic isolation bridge (23) connected to the magnet hole (22) on its side. The contact position of adjacent transition magnetic bridges (21) forms a pole arc segment (24). The magnet (26) is embedded in the corresponding magnet hole (22). The tension assembly (30) includes a winder (31) fixed to the output shaft of the motor assembly and a rope (32) with one end fixed to the winder (31).

2. The direct reeving rope-in-line motorized exercise piece for a strength training machine of claim 1, wherein, One end of the rope (32) is fixed to the winder (31), and the other end is a free end for the trainee to pull. The ropes (32) are arranged in an adjacent manner on the outer circumferential surface of the winder (31). When the motor assembly is powered on, the output shaft (29) drives the winder (31) to rotate and wind up and down the rope (32). The trainee pulls the free end of the rope (32) against the pulling force of the output shaft (29).

3. The direct reeving rope-in-line motorized exercise piece for a strength training machine of claim 1, wherein, The winder (31) is designed as a cylindrical shape with equal diameter; or, the winder (31) is provided with anti-rope fall-off barriers on both sides, and a winding space for the rope (32) to be wound is formed between the anti-rope fall-off barriers, and the winding space is designed as a cylindrical shape with equal diameter.

4. The direct reeving rope-in-line motorized exercise piece for a strength training machine of claim 2, wherein, The trainee directly applies force to the free end of the rope (32) to pull the rope (32) to complete the strength training, or the trainee indirectly applies force to the free end of the rope (32) through a secondary guide to pull the rope (32) and thus complete the strength training.

5. The direct reeving rope-in-line motorized exercise piece for a strength training machine of claim 4, wherein, The secondary guide is a movable pulley group consisting of at least one movable pulley. The movable pulley group (70) includes a movable pulley fixing block (71) and a movable pulley (72) located inside the movable pulley fixing block (71). A connector (73) is provided at the bottom of the movable pulley fixing block (71). A pull line (74) passes through the movable pulley (72) to pull the movable pulley (72). A rope (32) is connected to the connector (73).

6. The direct reeving rope-in-line motorized exercise piece for a strength training machine of claim 5, wherein, The movable pulley fixing block (71) is provided with at least one through hole for the guide rail to pass through, wherein the guide rail is a rigid guide rail or a flexible guide rail.

7. The direct reeving rope-in-line motorized exercise piece for a strength training machine of claim 4, wherein, The secondary guide is a pulley group consisting of at least one movable pulley. After the rope (32) passes through the movable pulley, the other end is fixed to the motor or the whole structure. A lead wire (81) is provided on the movable pulley to pull the movable pulley.

8. The direct reeving rope-in-line motorized exercise piece for a strength training machine of claim 1, wherein, A rope stopper (60) is provided on the motor assembly on one side of the output shaft (29), and the rope stopper (60) is located below the winder (31) and directly opposite the rope (32).

9. The direct reeving rope-in-line motorized exercise piece for a strength training machine of claim 1, wherein, The tension assembly (30) includes a bracket fitted around the outer periphery of the winder (31), with both ends of the bracket fixed to the motor assembly or the overall structure. The bracket is equipped with a rope outlet, from which the rope (32) is led out.

10. The direct reeving rope-in-line motorized exercise piece for a strength training machine of claim 1, wherein, The winding device (31) has through holes at both ends. The rope passes through one of the through holes at both ends of the winding device (31), through the internal hole in the same direction as the output shaft (29), and then exits from the side.

11. The direct reeving rope-in-line motorized exercise piece for a strength training machine of claim 1, wherein, The transition magnetic bridges (21) located on both sides of the same polar arc segment (24) are symmetrically arranged to form a transition bridge.

12. The direct reeving rope-in-line motorized exercise piece for a strength training machine of claim 1 wherein, The outer periphery of the pole arc segment (24) is recessed towards the center of the lamination relative to the outer periphery of the transition magnetic bridge (21) on both sides. The transition magnetic bridge (21) is an arc surface that bends towards the outer side of the rotor core.

13. The direct reeving rope-in-line motorized exercise piece for a strength training machine of claim 1 wherein, The shape of the magnet hole (22) is square or square with curved edges. The shape of the magnet (26) matches the magnet hole (22), and the magnet (26) is embedded in the magnet hole (22) one by one. The magnet (26) is made of neodymium iron boron.

14. The direct reeving rope-in-line motorized exercise piece for a strength training machine of claim 1 wherein, Each magnet hole (22) has a magnetic bridge (23) connected to the magnet hole (22) on both sides, and the two magnetic bridges (23) are symmetrically arranged with respect to the radial central axis of each magnet hole (22).

15. The direct reeving rope-in-line motorized exercise piece for a strength training machine of claim 1 wherein, A cross-axis section (25) is provided between two adjacent magnet holes (22), and a magnetic bridge (23) is connected to both ends of the cross-axis section (25). Adjacent transition magnetic bridges (21) are connected through the cross-axis section (25) and the pole arc section (24). The pole arc section (24) and the magnetic bridge (23) are connected through the transition magnetic bridge (21) located outside the magnet hole (22).

16. The direct reeving rope-in-line motorized exercise piece for a strength training machine of claim 1 wherein, Multiple symmetrical weight-reducing holes (27) are provided on the laminations of the rotor core, and the multiple weight-reducing holes (27) are spaced apart along the circumference of the rotor core.

17. The direct reeving rope-in-line motorized exercise piece for a strength training machine of claim 1 wherein, A central hole (28) is provided at the center of the lamination of the rotor core. The motor assembly includes an output shaft (29) passing through the central hole (28). The tension assembly (30) acts directly on the output shaft (29).

18. The direct reeving rope-in-line motorized exercise piece for a strength training machine of claim 1 wherein, The stator assembly (10) includes a stator core (11), a coil frame (12), insulating paper (13), and enameled wire (14). The stator core (11) is composed of multiple stacked laminations, and stator slots are formed on the laminations at equal intervals. The rotor assembly (20) is located inside the stator assembly (10), and the magnets (26) on the laminations of the rotor core are magnetized alternately according to NS. Each magnet (26) forms a magnetic pole, and the magnetic poles of adjacent NS form a pole pair.

19. The direct reeving rope-in-line motorized exercise piece for a strength training machine of claim 1 wherein, The motor assembly includes a housing (40), which is composed of a casing (41), a rear end cover (42) and a front end cover (43). The rotor assembly (20) is located inside the stator assembly (10) and then fixed to the inside of the casing (41). The rear end cover (42) is connected to the rear end of the casing (41), and the front end cover (43) is securely connected to the front end of the casing (41).

20. The direct reeving rope-in-line motorized exercise piece for a strength training machine of claim 1 wherein, A magnetic encoder (50) is additionally designed on the stator assembly (10). The magnetic encoder (50) includes a magnetic encoder chip printed circuit board (51), a magnetic component (52), a magnetic component mounting base (53), and a cover (54). The magnetic encoder chip printed circuit board (51) is embedded in the middle of the rear cover (42). A magnetic component (52) is installed at one end of the output shaft (29). The magnetic component (52) and the magnetic encoder chip printed circuit board (51) are coaxially aligned. The magnetic encoder chip printed circuit board (51) is provided with a cover (54) on the outside. The set distance between the magnetic component (52) and the magnetic encoder chip printed circuit board (51) is precisely controlled.

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