Riding equipment with built-in electromagnetic damping module
By incorporating pole shoes and using insulating paper in the electromagnetic damping module, the problems of low drag torque and low material utilization in existing technologies are solved, achieving higher drag torque and higher space utilization, and simplifying the processing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2026-03-06
AI Technical Summary
The electromagnetic damping modules of existing cycling equipment have low resistance torque for the same volume, and are complex to manufacture and have low material utilization. The existing plastic frame for fixing the coil needs to be heat resistant and is complicated to assemble.
Design a built-in electromagnetic damping module to increase the area of magnetic field lines by setting pole shoes on the main magnetic poles, and to improve space utilization by using insulating paper instead of plastic skeleton and winding more coil turns.
Achieving higher resistance torque in an electromagnet core of the same or smaller volume improves space utilization, simplifies the manufacturing process, and reduces material costs.
Smart Images
Figure CN223969411U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cycling train technology, and more specifically to a cycling device with a built-in electromagnetic damping module. Background Technology
[0002] Intelligent cycling devices (such as trainers and exercise bikes) are currently the most common cycling power assist products on the market. They can effectively help riders simulate outdoor cycling conditions and significantly improve their power output. Electromagnetic trainers / exercise bikes, in particular, use electromagnetic methods to adjust resistance. When the trainer / exercise bike is working, a coil is energized to generate a magnetic field, which is amplified by an electromagnet core. The rotating damping wheel on the trainer / exercise bike cuts through the magnetic induction lines, generating a damping torque to achieve the desired cycling resistance.
[0003] Currently, cycling equipment typically uses, such as Figure 14 The three electromagnetic damping modules shown are: Figure 14 (a) shows an electromagnet core with multiple coils radially embedded (referred to as a radially embedded multipole type). Figure 14 (b) shows a single coil radially embedded in the electromagnet core (referred to as radially embedded unipolar type electromagnet core). Figure 14 (c) shows a single coil radially externally mounted on the electromagnet core (referred to as radially externally mounted monopole type). All other things being equal... Figure 14 (a) The generating drag torque is the greatest. Figure 14 (b) and Figure 14 (c) The generated drag torques are similar. Figure 14 (a) The electromagnet core has the largest volume. Figure 14 (b) and Figure 14 The electromagnet cores in (c) have similar volumes. However, for Figure 14 (a) Complex processing and assembly, high material usage, and low material utilization; while Figure 14 (b) and Figure 14 (c) Simple to process, small in size, but Figure 14 (b) and Figure 14 (c) A plastic frame is required to fix the coil. Since the coil will continue to heat up after being energized, high-temperature resistant plastics need to be selected during the design. The fixing problem after the frame and the electromagnet core are assembled also needs to be considered. In addition, the resistance generated by these two types is also relatively small.
[0004] To address this, this application proposes an electromagnetic damping module that, in conjunction with... Figure 14 (b) shows that, based on the same or smaller volume of the electromagnet core, a higher resistance torque is obtained by increasing the working surface of the core. Utility Model Content
[0005] The purpose of this invention is to provide a cycling device with a built-in electromagnetic damping module. The electromagnetic damping module of this invention can improve space utilization, improve resistance performance, and have a higher resistance torque.
[0006] Therefore, this utility model provides a cycling device with a built-in electromagnetic damping module, including a main beam with a pulley mounted on its top; it also includes a damping wheel connected to the pulley via a belt and a pulley; an electromagnetic module mounted on the main beam via a fixing component and located inside the damping wheel; the electromagnetic module includes an electromagnetic core, including a magnetic bridge, with auxiliary magnetic poles at both ends of the magnetic bridge, a main magnetic pole at the center of the magnetic bridge, and pole shoes at the ends of the main magnetic pole, with both ends of the pole shoes extending toward the two auxiliary magnetic poles respectively, the main magnetic pole, the auxiliary magnetic poles, and the pole shoes forming an electromagnetic core space; and a coil wound within the electromagnetic core space, with insulating paper attached to the inner side of the electromagnetic core space.
[0007] Preferably, the outer surface of the pole shoe and the end faces of the two auxiliary magnetic poles are both arc surfaces, and the outer surface of the pole shoe and the end faces of the two auxiliary magnetic poles are located on the same arc surface and are adapted to the inner arc surface of the damping wheel.
[0008] Preferably, the thickness of the insulating paper is 0.25-0.5 mm.
[0009] Preferably, the length of the main magnetic pole is defined as Z. y The maximum number of turns allowed in the electromagnet core is N, the wire diameter of the coil is r, the maximum number of turns per layer of coil is Q, and the thickness of the insulating paper is t.
[0010]
[0011] Preferably, the width of the secondary magnetic pole is defined as F. x The length of the magnetic bridge is C y C y ≥F x .
[0012] Preferably, the width of the main magnetic pole is defined as Z. x The wire diameter of the coil is r, the maximum number of turns per layer of coil is Q, the thickness of the insulating paper is t, the distance between the pole shoe and the secondary magnetic pole is D, the minimum distance between the two secondary magnetic poles is H, and H≥2×Q×r+Z x +2×D+2×t.
[0013] Preferably, it further includes a positioning element, the positioning element being adapted to the shape of the electromagnet core, the positioning element being fixed on the electromagnet core; the positioning element is provided with two positioning blocks, the two positioning blocks being used to limit the coil.
[0014] Preferably, the positioning element includes a first positioning piece, with second positioning pieces at both ends of the first positioning piece and a third positioning piece at the center of the first positioning piece; the first positioning piece is attached to the magnetic bridge, the two second positioning pieces are attached to the two auxiliary magnetic poles respectively, and the third positioning piece is attached to the main magnetic pole.
[0015] Preferably, the length of the third positioning piece is greater than the length of the main magnetic pole, and the two positioning blocks are respectively protruding from both ends of the third positioning piece.
[0016] Preferably, the fixing assembly includes a screw connected to the electromagnet core and a connecting block fixed to the main beam, the screw being connected to the connecting block.
[0017] Compared with the prior art, the advantages and positive effects of this utility model are:
[0018] This application increases the area of magnetic field lines by designing pole shoes on the main magnetic poles, thereby improving the electromagnetic effect and obtaining a higher drag torque.
[0019] This application incorporates insulating paper between the electromagnet core and the coil, isolating them and protecting the coil. Furthermore, replacing the existing plastic frame with insulating paper allows for a greater number of coil turns on the electromagnet core, improving its space utilization.
[0020] This application can achieve higher drag torque and improve space utilization based on the same or smaller volume of the electromagnet core.
[0021] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description
[0022] Figure 1 This is one of the structural schematic diagrams of an embodiment of the cycling device with a built-in electromagnetic damping module of this utility model;
[0023] Figure 2 This is a second structural schematic diagram of an embodiment of the cycling device with a built-in electromagnetic damping module of this utility model;
[0024] Figure 3 This is one of the structural schematic diagrams of an embodiment of the electromagnetic module of this utility model;
[0025] Figure 4 This is a second structural schematic diagram of an embodiment of the electromagnetic module of this utility model;
[0026] Figure 5This is a schematic diagram of one embodiment of the electromagnet core of this utility model;
[0027] Figure 6 This is a schematic diagram of one embodiment of the positioning component of this utility model;
[0028] Figure 7 This is a schematic diagram of one embodiment of the insulating paper of this utility model;
[0029] Figure 8 This is a schematic diagram of the magnetic field lines generated by the electromagnetic module of this utility model.
[0030] Figure 9 for Figure 14 (b) shows a schematic diagram of the magnetic field lines generated by the electromagnetic module;
[0031] Figure 10 The electromagnetic module of this utility model and Figure 14 (b) shows a simulation comparison of the drag torque generated by the electromagnetic module under different currents;
[0032] Figure 11 The electromagnetic module of this utility model and Figure 14 (b) shows a comparison of the resistance torque generated by the electromagnetic module under different currents.
[0033] Figure 12 This is the third structural schematic diagram of an embodiment of the cycling device with a built-in electromagnetic damping module of this utility model;
[0034] Figure 13 This is the fourth structural schematic diagram of an embodiment of the cycling device with a built-in electromagnetic damping module of this utility model;
[0035] Figure 14 This is a structural diagram of the existing electromagnetic damping module described in the background section, wherein, Figure 14 (a) shows an electromagnet core with multiple coils radially embedded (referred to as a radially embedded multipole type). Figure 14 (b) shows a single coil radially embedded in the electromagnet core (referred to as radially embedded unipolar type electromagnet core). Figure 14 (c) shows a single coil radially outward of the electromagnet core (abbreviated as radially outward monopole type of electromagnet core). Detailed Implementation
[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.
[0037] The present invention relates to a cycling device with a built-in electromagnetic damping module, comprising a main beam 10 with a pulley 11 mounted on its top; and an electromagnetic damping module, specifically comprising: a damping wheel 20 connected to the pulley 11 via a belt 21 and a pulley 22; an electromagnetic module mounted on the main beam 10 via a fixing assembly and located inside the damping wheel 20; the electromagnetic module comprising: an electromagnetic core, which is a symmetrical integral component, comprising a magnetic bridge 31, with auxiliary magnetic poles 32 at both ends of the magnetic bridge 31, a main magnetic pole 33 at the center of the magnetic bridge 31, and pole shoes 34 at the ends of the main magnetic poles 33, with both ends of the pole shoes 34 extending toward the two auxiliary magnetic poles 31, the main magnetic poles 33, auxiliary magnetic poles 32, and pole shoes 34 forming an electromagnetic core space; and a coil 40 wound within the electromagnetic core space, with insulating paper attached to the inner side of the electromagnetic core space.
[0038] During use, the bicycle is installed on the riding device of this application. The pulley 11 drives the pulley 22 to rotate via the belt 21. The pulley 22 is coaxially connected to the damping wheel 20, thus its rotation can be synchronously converted into the rotation of the damping wheel 20. Simultaneously, after the electromagnetic damping module is energized, according to Ampere's law, the energized coil 40 generates a magnetic field, which is strengthened by the electromagnet core. When the damping wheel 20 rotates, according to Lenz's law and Faraday's electromagnetic effect, the rotation of the damping wheel 20 cuts magnetic field lines, generating an eddy current field on the surface of the damping wheel 20. This eddy current field interacts with the magnetic field of the coil, thus generating resistance that hinders the rotation of the damping wheel 20.
[0039] In this application, the coil 40 is wound within the space of the electromagnet core, that is, the coil 40 is wound around the outer layer of the main magnetic pole 33. The main magnetic pole 33 is used to generate and concentrate the magnetic field, and is the main source of the rotational resistance of the damping wheel 20. The pole shoe 34 is connected to the main magnetic pole 33, which can increase the effective area of the magnetic field lines of the iron core and improve the electromagnetic effect, thereby obtaining a higher resistance torque with the same volume or smaller volume of electromagnet core. In addition, the pole shoe 34 can also limit the coil 40, which can restrict the displacement of the coil 40. The two auxiliary magnetic poles 32 are uncovered. The function of the auxiliary magnetic poles 32 is to conduct the magnetic field and to install and fix the electromagnet core. The magnetic bridge 31 is used to connect the main magnetic pole 33 and the two auxiliary magnetic poles 32, so that the magnetic field conduction becomes a complete magnetic circuit and reduces magnetic leakage.
[0040] Figure 8 This is a schematic diagram of the magnetic field lines generated by the electromagnetic damping module of this application. Figure 9 for Figure 14 (b) shows a schematic diagram of the magnetic field lines generated by the electromagnetic damping module; from Figure 8 and Figure 9It can be seen that after the pole shoe 34 is provided on the main magnetic pole 33 of this application, the area of the main magnetic pole 33 acting on the damping wheel 20 is significantly increased, and the area of the magnetic field lines acting on the damping wheel 20 is increased, thereby generating a greater resistance torque on the damping wheel 20.
[0041] Assuming the damping wheel has the same size and rotational speed, the air gap between the damping wheel and the electromagnetic module is the same, the number of coil turns and the current carrying it are the same, and the thickness of the electromagnet core is the same, under the above conditions... Figure 10 For the electromagnetic damping module of this application and Figure 14 (b) shows a simulation comparison of the drag torque generated by the electromagnetic damping module under different currents; Figure 11 For the electromagnetic damping module of this application and Figure 14 (b) shows a comparison of the resistive torque generated by the electromagnetic damping module under different currents. Figure 10 and Figure 11 It can be seen that, under the same conditions, the drag torque generated by the electromagnetic damping module of this application is higher than that of the electromagnetic damping module of this application. Figure 14 (b) shows the drag torque generated by the electromagnetic damping module.
[0042] Based on the above analysis, this application demonstrates that arranging the pole shoe 34 on the main magnetic pole 33 can generate higher resistance. Furthermore, the design of the pole shoe 34's dimensions must consider not only the area of the magnetic field but also the winding and limiting of the coil 40. The electromagnetic core dimensions in this application are named as follows: Figure 5 As shown, Zx is the width of the main magnetic pole 33; Zy is the length of the main magnetic pole 33; H is the distance between the two auxiliary magnetic poles 32; Fx is the width of the auxiliary magnetic pole 32; Cy is the length of the magnetic bridge 31; D is the distance between the pole shoe 34 and the auxiliary magnetic pole 32; R is the radius of the arc surface of the electromagnet core (the outer arc surface radius of the pole shoe 34), designed according to the air gap requirements and the inner diameter of the damping wheel; K is the thickness of the pole shoe 34. To obtain higher resistance and improve material utilization, let the wire diameter of the coil 40 be r, the maximum number of turns allowed for the coil 40 to be wound in the electromagnet core be N, the maximum number of turns per layer of coil 40 be Q, and the thickness of the insulating paper be t. The design formula and explanation of the electromagnet core are as follows:
[0043]
[0044] C y ≥F x (1-2)
[0045] D = 2 × r + Δ (1-3)
[0046] H≥2×Q×r+Z x +2×D+2×t (1-4)
[0047] Equation (1-1) is based on the purpose of the pole shoe 34 to restrict the movement of the coil 40. The Zy value needs to be equal to the sum of the height of the coil 40 after winding and the thickness of the two layers of insulating paper. Equation (1-2) is to consider the structural strength of the electromagnet core. The length of the magnetic bridge 31 cannot be less than the width of the secondary magnetic pole 32. Equation (1-3) considers maximizing the effective area of the main magnetic pole 31. The distance D between the pole shoe 34 and the secondary magnetic pole 32 needs to be as small as possible. However, considering the winding of the coil 40, the size of D needs to allow the enameled wire and winding clamp to pass through, where Δ represents the clamp width. Equation (1-4) is the formula for calculating the minimum distance H between the two secondary magnetic poles 32 within the maximum allowable number of winding turns of the electromagnet core. According to the above formula, it can be ensured that the coil 40 will not fall off after winding.
[0048] The outer surface of the pole shoe 34 and the end faces of the two auxiliary magnetic poles 32 are all arc surfaces. The outer surface of the pole shoe 34 and the end faces of the two auxiliary magnetic poles 32 are located on the same arc surface and are adapted to the inner arc surface of the damping wheel 20. This allows the electromagnetic module of this device to be adapted to the damping wheel 20 and increases the area of magnetic field lines acting on the damping wheel 20, thereby increasing the resistance torque.
[0049] In this application, two insulating papers are used, one on each side of the main magnetic pole 33. Specifically:
[0050] The insulating paper includes a first insulating paper 51, a second insulating paper 52, a third insulating paper 53, and a fourth insulating paper 54. The first insulating paper 51 is attached to the inner side of the auxiliary magnetic pole 32, the second insulating paper 52 is attached to the inner side of the magnetic bridge 31, the third insulating paper 53 is attached to the side of the main magnetic pole 33, and the fourth insulating paper 54 is attached to the inner side of the pole shoe 34. This arrangement of insulating paper isolates the electromagnet core from the coil 40, thereby protecting the coil 40.
[0051] This application uses insulating paper instead of the plastic skeleton structure in the existing electromagnet core. Since the high temperature resistance of the insulating paper is much higher than that of most plastic skeletons and its thickness is 1 / 10 of that of the insulating skeleton, the insulating paper occupies less space. Therefore, compared with the existing electromagnet core using a plastic skeleton, the electromagnet core of this application can wind more coils in the space, thus improving space utilization.
[0052] The thickness of the insulating paper can be 0.25-0.5mm. This application uses insulating paper of the above thickness, which can effectively protect the coil 40 without taking up too much space, allowing more coil turns to be wound in the space of the electromagnet core, thus improving space utilization.
[0053] The positioning component 60 is a symmetrical integral component, and the overall positioning component 60 is in the shape of a mountain. It includes a first positioning piece 61, with second positioning pieces 62 at both ends of the first positioning piece 61 and a third positioning piece 63 at the center of the first positioning piece 61. The first positioning piece 61 is attached to the magnetic bridge 31, the two second positioning pieces 62 are attached to the two auxiliary magnetic poles 32 respectively, and the third positioning piece 63 is attached to the main magnetic pole 33.
[0054] The length of the third positioning piece 63 is greater than the length of the main magnetic pole 33. Two protruding positioning blocks 64 are fixed at both ends of the third positioning piece 63. The two positioning blocks 64 are located on both sides of the coil 40, which can limit the coil 40 and effectively prevent the coil 40 from shifting.
[0055] The fixing components include screws 35 connected to the electromagnet core and connecting blocks 12 fixed to the main beam 10, with screws 35 connected to connecting blocks 12.
[0056] Specifically, a through hole 36 is provided through the secondary magnetic pole 32 and the second positioning piece 62, and a screw 35 is connected in the through hole 36.
[0057] The connecting block 12 is provided with a connecting post 13. The connecting block 12 and the connecting post 13 are integral parts, and the outer diameter of the connecting block 12 is larger than the outer diameter of the connecting post 13. The main beam 10 is provided with a mounting groove 14, and the connecting post 13 is fixed in the mounting groove 14, thereby fixing the connecting block 12 to the main beam 10. The connecting post 13 can be welded and fixed in the mounting groove 14, or it can be fixed in the mounting groove 14 by other methods commonly used in the art, without specific limitations.
[0058] The connecting block 12 is provided with a threaded groove, and the screw 35 is threaded into the threaded groove, so that the electromagnet core can be connected and fixed to the main beam 10.
[0059] The main beam 10 is provided with a positioning groove 15, which is adapted to the coil 40. The coil 40 extends into the positioning groove 15 and is fitted with the positioning groove 15 with a gap.
[0060] There are multiple connecting blocks 12, and the multiple connecting blocks 12 can be located at equal intervals on the outer edge of the positioning groove 15.
[0061] The positioning groove 15 serves as a guide for the installation of the electromagnetic module on the main beam 10, and also reduces the space occupied by the electromagnetic module, making the structure of the riding device more compact. During installation, the coil on the electromagnetic module is inserted into the positioning groove 15, and then the screws 35 on the electromagnetic module are connected one by one to the connecting block 12, thereby fixing the electromagnetic module on the main beam 10.
[0062] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.
Claims
1. A riding device with built-in electromagnetic damping module, comprising a main beam, the top of which is provided with a belt pulley; characterized in that, Further comprising: a damping wheel connected with the pulley by a belt and a pulley wheel; an electromagnetic module mounted on the main beam by a fixing assembly and located at the inner side of the damping wheel; the electromagnetic module comprising: an electromagnetic core comprising a magnetic bridge, two ends of the magnetic bridge respectively provided with a secondary magnetic pole, a center of the magnetic bridge provided with a primary magnetic pole, an end of the primary magnetic pole provided with a pole shoe, two ends of the pole shoe respectively extending towards two secondary magnetic poles, the primary magnetic pole, the secondary magnetic pole and the pole shoe surrounding an electromagnetic core space; a coil wound in the electromagnetic core space, an inner side of the electromagnetic core space attached with an insulating paper.
2. The riding equipment with the built-in electromagnetic damping module according to claim 1, wherein outer sides of the pole shoes and end faces of the two secondary magnetic poles are arc faces, the outer sides of the pole shoes and the end faces of the two secondary magnetic poles located on the same arc face and matched with the inner side arc face of the damping wheel.
3. The riding equipment with the built-in electromagnetic damping module according to claim 1, wherein the thickness of the insulating paper is 0.25-0.5mm.
4. The riding equipment with the built-in electromagnetic damping module according to claim 1, wherein The main magnetic pole length is defined as Z y , the maximum number of turns of the coil winding is N, the wire diameter of the coil is r, the maximum number of turns of each layer of the coil is Q, and the thickness of the insulation paper is t, 5. The riding equipment with the built-in electromagnetic damping module according to claim 1, wherein The width of the secondary magnetic pole is defined as F x The length of the magnetic bridge is defined as C y C y ≥ F x .
6. The riding equipment with the built-in electromagnetic damping module according to claim 1, wherein The main magnetic pole width is defined as Z x , the wire diameter of the coil is r, the maximum number of turns of each layer of the coil is Q, the thickness of the insulation paper is t, the distance between the pole shoe and the secondary magnetic pole is D, the minimum distance between the two secondary magnetic poles is H, and H≥2×Q×r+Z x +2×D+2×t.
7. The riding equipment with the built-in electromagnetic damping module according to claim 1, further comprising a positioning piece matched with the shape of the electromagnetic core, the positioning piece fixed on the electromagnetic core, the positioning piece provided with two positioning blocks, the two positioning blocks used for limiting the coil.
8. The riding equipment with the built-in electromagnetic damping module according to claim 7, wherein the positioning piece comprises a first positioning sheet, two ends of the first positioning sheet respectively provided with a second positioning sheet, a center of the first positioning sheet provided with a third positioning sheet; the first positioning sheet matched with the magnetic bridge, the two second positioning sheets respectively matched with the two secondary magnetic poles, the third positioning sheet matched with the primary magnetic pole.
9. The riding equipment with the built-in electromagnetic damping module according to claim 8, wherein the length of the third positioning sheet is greater than the length of the primary magnetic pole, the two positioning blocks respectively protrudingly arranged at two ends of the third positioning sheet.
10. The riding equipment with the built-in electromagnetic damping module according to claim 1, wherein the fixing assembly comprises a screw connected with the electromagnetic core and a connecting block fixed on the main beam, the screw connected with the connecting block.