A linear motor structure

Abstract

The utility model discloses a linear motor structure, the linear motor structure includes: the rotor subassembly and stator subassembly, and the stator subassembly includes the mounting panel and guide rail, and the guide rail is along the locus of mounting panel and is arranged, and the rotor subassembly is slidably connected in the guide rail, and the mounting panel is composed of straight line section, transition section and arc section, and the straight line section is equipped with the rectangular coil and rectangular metal core of the cross section is rectangular shape, and the transition section is equipped with the transition trapezoidal coil and transition trapezoidal metal core of the cross section is trapezoidal shape, and the arc section is equipped with the trapezoidal coil and trapezoidal metal core of the cross section is trapezoidal shape. The utility model can better make the compact arrangement of iron core and coil, avoid appearing larger gap, optimize the overall structure layout of motor, also reduce the space occupation, improve the space utilization rate, in addition, through the control rotor subassembly and directly facing the change of iron core area, make the magnetic flux change rate of flowing through rotor subassembly and iron core reduce, thereby effectively reduced the thrust fluctuation.

Description

Technical Field

[0001] This utility model relates to the field of linear motor technology, and in particular to a linear motor structure. Background Technology

[0002] Linear motors, as electric transmission devices that directly convert electrical energy into linear motion mechanical energy, offer numerous significant advantages. They are highly efficient, reducing unnecessary losses during energy conversion and improving energy utilization; their high power density allows for high power output within a relatively small volume, meeting the power performance requirements of equipment; their simple structure eliminates intermediate conversion components compared to traditional rotary motors with complex transmission mechanisms, reducing system complexity and failure rate; their high reliability reduces potential failures caused by wear and loosening of transmission components; their fast response allows for rapid reaction to control signals, enabling quick start, stop, and speed changes; and their precise positioning meets the needs of high-precision positioning applications. Based on these advantages, linear motors are widely used in many high-performance industries such as automation equipment, CNC machine tools, medical equipment, rail transportation, aerospace, and the military.

[0003] Compared to rotary motors, linear motors are structurally simpler, giving them a unique advantage in applications requiring both structural simplicity and stringent performance. However, in practical applications, especially in specialized transmission line scenarios, linear motors face several pressing issues that need to be addressed.

[0004] When using a linear motor on a transmission line that combines curved and straight sections, a series of problems arise if both the curved and straight sections use the same rectangular core and coil structure, which is detrimental to motor performance and system stability. Due to the special geometry of the curved section, it is difficult to achieve a compact arrangement of the uniform rectangular core and coil, resulting in a large gap on the outer side of the curved section. This gap not only affects the magnetic field distribution of the motor and reduces its operating efficiency, but may also cause additional vibration and noise, affecting the stability and reliability of the entire transmission system.

[0005] Furthermore, when the core distance of a linear motor is large, the thrust fluctuation of the motor will increase significantly. Thrust fluctuation is an important performance indicator during the operation of a linear motor. Large thrust fluctuations can cause problems such as speed fluctuations, vibrations, and noise during operation, seriously affecting the operating accuracy and stability of the equipment, reducing its service life, and even potentially causing damage and malfunction.

[0006] In summary, the market currently lacks a highly stable transmission line linear motor that features a compact structure across both straight and curved segments, with minimal output thrust fluctuations, to meet the application requirements of transmission lines that combine both curved and straight lines. Therefore, designing a transmission line linear motor that can solve these problems has significant practical importance and broad market prospects. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a linear motor structure.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] This utility model embodiment provides a linear motor structure, including: a mover assembly and a stator assembly. The stator assembly includes a mounting plate and a guide rail. The guide rail is arranged along the trajectory of the mounting plate. The mover assembly is slidably connected to the guide rail. The mounting plate is composed of a straight segment, a transition segment, and an arc segment. The straight segment is provided with a rectangular coil and a rectangular metal core with a rectangular cross-section. The transition segment is provided with a transition trapezoidal coil and a transition trapezoidal metal core with a trapezoidal cross-section. The arc segment is provided with a trapezoidal coil and a trapezoidal metal core with a trapezoidal cross-section.

[0010] In one specific embodiment, the rectangular coil, the rectangular metal core, the transition trapezoidal coil, the transition trapezoidal metal core, the trapezoidal coil, and the trapezoidal metal core are arranged on the mounting plate and are fixedly connected by a shaped potting compound layer.

[0011] In one specific embodiment, the moving part assembly includes a bow support, a roller, and a wedge magnet. The roller is connected to the bow support and slidably connected to the guide rail. The wedge magnet is connected to the bow support and abuts against the shaped potting compound layer.

[0012] In one specific embodiment, the bow support is provided with a moving yoke plate, and the wedge-shaped magnet is connected to the moving yoke plate.

[0013] In one specific embodiment, the bow support is connected to a roller shaft, and the roller is connected to the roller shaft.

[0014] In one specific embodiment, the upper and lower ends of the bow support are provided with roller shafts to form rollers at the upper and lower ends that clamp the guide rail.

[0015] In one specific embodiment, the wedge-shaped magnet has four wedge angles symmetrically distributed.

[0016] In one specific embodiment, the spacing between adjacent rectangular metal cores, transition trapezoidal metal cores, and / or trapezoidal metal cores is equal.

[0017] In one specific embodiment, the sides of adjacent rectangular metal cores, transition trapezoidal metal cores, and / or trapezoidal metal cores are arranged in parallel.

[0018] In one specific embodiment, the rectangular metal core, the transitional trapezoidal metal core, and the trapezoidal metal core are all iron cores.

[0019] The advantages of this linear motor structure compared to existing technologies are as follows: By setting the mounting plate to consist of straight segments, transition segments, and arc segments, different trajectory segments are respectively equipped with coils and metal cores adapted to them. Trapezoidal coils and metal cores are used in the arc segments. Compared to the traditional use of a uniform rectangular iron core and coil structure, this better conforms to the geometry of the arc segment, allowing the iron core and coil to be compactly arranged in the arc segment, avoiding large gaps on the outer side of the arc segment. This not only optimizes the overall structural layout of the motor but also reduces space occupation, improves space utilization, and enables the motor to... This design allows for more flexible application in transmission line scenarios that combine both curved and straight lines. Furthermore, by using rectangular coils in straight sections and trapezoidal coils in curved and transition sections, this design reduces the area of ​​the mover assembly facing the core as it moves relative to the core. When the mover assembly slides on the guide rail, the change in the area facing the core affects the rate of change of magnetic flux. According to the principle of electromagnetic induction, the rate of change of magnetic flux is one of the important factors affecting thrust fluctuations. By controlling the change in the area facing the core, the rate of change of magnetic flux flowing through the mover assembly and the core is reduced, thereby effectively reducing thrust fluctuations.

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A three-dimensional schematic diagram of the linear motor structure provided by this utility model;

[0023] Figure 2 A top view of the linear motor structure provided by this utility model;

[0024] Figure 3 A front view schematic diagram of the linear motor structure provided by this utility model;

[0025] Figure 4 Right view schematic diagram of the linear motor structure provided by this utility model;

[0026] Figure 5 A bottom view of the linear motor structure provided by this utility model;

[0027] Figure 6 A schematic diagram of the wedge angle of the wedge magnet provided by this utility model;

[0028] Figure 7 A schematic diagram showing the arrangement of the coil and metal core provided by this utility model;

[0029] Figure 8 A schematic diagram of the included angle of the coil provided by this utility model.

[0030] Figure label:

[0031] 10. Mover assembly, 11. Bow support, 12. Roller, 13. Wedge magnet, 14. Mover yoke, 15. Roller shaft, 20. Stator assembly, 21. Mounting plate, 22. Guide rail, 23. Rectangular coil, 24. Rectangular metal core, 25. Transition trapezoidal coil, 26. Transition trapezoidal metal core, 27. Trapezoidal coil, 28. Trapezoidal metal core, 29. Shaped potting compound layer. Detailed Implementation

[0032] 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 specific embodiments.

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0039] See Figures 1 to 8As shown, this utility model discloses a specific embodiment of a linear motor structure, including: a mover assembly 10 and a stator assembly 20. The stator assembly 20 includes a mounting plate 21 and a guide rail 22. The guide rail 22 is arranged along the trajectory of the mounting plate 21. The mover assembly 10 is slidably connected to the guide rail 22. The mounting plate 21 is composed of a straight segment, a transition segment, and an arc segment. The straight segment is provided with a rectangular coil 23 and a rectangular metal core 24 with a rectangular cross-section. The transition segment is provided with a transition trapezoidal coil 25 and a transition trapezoidal metal core 26 with a trapezoidal cross-section. The arc segment is provided with a trapezoidal coil 27 and a trapezoidal metal core 28 with a trapezoidal cross-section.

[0040] Specifically, the mounting plate 21 consists of straight segments, transition segments, and curved segments. These segments are smoothly connected through high-precision machining processes, ensuring a smooth transition during the movement of the moving part assembly 10. For example, the mounting plate 21 is machined using a CNC machining center to ensure the dimensional and shape accuracy of each segment. The straight segments remain straight, the curved segments have precise radii of curvature, and the transition segments are machined according to a predetermined curve equation to achieve a natural transition between the straight and curved segments.

[0041] On the straight section of the mounting plate 21, a rectangular coil 23 and a rectangular metal core 24 are installed according to design requirements. The rectangular coil 23 can be made of enameled wire, and the number of turns, shape, and size of the coil must meet the design standards during the winding process. The rectangular metal core 24 is made of a material with good magnetic permeability, such as silicon steel sheet, and is made into a rectangular shape by means of stacking, etc., and is fixedly connected to the mounting plate 21. The transition section is provided with a transition trapezoidal coil 25 and a transition trapezoidal metal core 26. The shape of the transition trapezoidal coil 25 is designed according to the geometry of the transition section, and its winding method is similar to that of the rectangular coil 23, but attention should be paid to the distribution and arrangement of the coil on the transition section to adapt to the curve changes of the transition section. The transition trapezoidal metal core 26 is also made of magnetic permeable material, and its shape matches that of the transition trapezoidal coil 25. It is made into a transition trapezoid through special processing technology (such as stamping, bending, etc.) and is firmly connected to the mounting plate 21. The arc section is provided with a trapezoidal coil 27 and a trapezoidal metal core 28. The winding of the trapezoidal coil 27 must take into account the curvature of the arc segment. This can be achieved using segmented winding or special winding equipment to ensure that the shape and dimensions of the coil on the arc segment meet design requirements. The trapezoidal metal core 28 is custom-processed according to the shape of the arc segment and connected to the mounting plate 21 through welding, riveting, or other methods. The guide rail 22 is set along the trajectory of the mounting plate 21 and is fixed to the mounting plate 21 using a high-precision installation process. The guide rail 22 is typically made of high-strength, wear-resistant materials, such as stainless steel or alloy steel, to ensure that the mover assembly 10 can slide smoothly and steadily on the guide rail 22.

[0042] In other words, the mounting plate 21 consists of a straight section, a transition section, and an arc section, and each section is equipped with a rectangular coil 23 and a rectangular metal core 24, a transition trapezoidal coil 25 and a transition trapezoidal metal core 26, and a trapezoidal coil 27 and a trapezoidal metal core 28 that are adapted to it. This design allows the linear motor to perfectly adapt to transmission line trajectories that combine arc and straight lines. In the arc section, the trapezoidal coil 27 and the trapezoidal metal core 28 can closely fit the shape of the arc section, avoiding the problem of traditional rectangular structures being difficult to arrange compactly in the arc section, reducing space occupation, and improving the compactness and rationality of the structure. The transition trapezoidal coil 25 and the transition trapezoidal metal core 26 in the transition section play a good connecting role between the straight section and the arc section. When the mover assembly 10 moves from the straight section to the arc section, the transition trapezoidal structure can make the movement state of the mover assembly 10 transition smoothly, reducing the impact and vibration caused by structural abrupt changes, and improving the stability and reliability of motor operation. Furthermore, coils and metal cores of different shapes can generate relatively uniform magnetic fields on their respective trajectory segments. In straight segments, the combination of rectangular coil 23 and rectangular metal core 24 can form a regular magnetic field distribution. In transition and arc segments, transition trapezoidal and trapezoidal structures can adjust the magnetic field distribution according to the changes in the trajectory, keeping the magnetic field relatively uniform across the entire mounting plate 21. This uniform magnetic field distribution helps improve the efficiency and performance of the motor and reduces energy loss. In addition, because appropriate coil and metal core shapes are used in different trajectory segments, the area of ​​the mover assembly 10 facing the iron core changes more gently when it moves relative to the iron core. This reduces the rate of change of magnetic flux flowing through the mover assembly 10 and the iron core. According to the principle of electromagnetic induction, the reduction in the rate of change of magnetic flux can effectively reduce thrust fluctuations, enabling the motor to output thrust at a more stable speed and acceleration during operation, thus improving the operating accuracy and stability of the equipment. In addition, the combined effect of compact structure and optimized magnetic field improves the response speed of the linear motor, makes the sliding of the mover assembly 10 on the guide rail 22 smoother, and enables the change of magnetic field to respond to the input signal more quickly, thus enabling the motor to start, stop and change speed quickly, meeting the needs of some application scenarios with high response speed requirements.

[0043] See Figures 1 to 4 As shown, in one embodiment, the rectangular coil 23, the rectangular metal core 24, the transition trapezoidal coil 25, the transition trapezoidal metal core 26, the trapezoidal coil 27, and the trapezoidal metal core 28 are arranged on the mounting plate 21 and are fixedly connected by a shaped potting compound layer 29.

[0044] Specifically, according to the design requirements, the rectangular coil 23, rectangular metal core 24, transition trapezoidal coil 25, transition trapezoidal metal core 26, trapezoidal coil 27, and trapezoidal metal core 28 are arranged sequentially at their respective positions on the mounting plate 21. Positioning fixtures or jigs can be used to fix the positions of the coils and metal cores, ensuring accurate relative positioning and spacing that meets design standards. For example, positioning holes or slots can be pre-machined on the mounting plate 21, and the positioning portions of the coils and metal cores can be inserted into them for precise installation. A shaped potting compound with good thermal conductivity and insulation properties is selected. Common thermally conductive and insulating potting compounds include epoxy resin potting compound and silicone potting compound. These potting compounds have good flowability, can fully fill the gaps between the coils and metal cores and the mounting plate 21, and can form a hard and stable structure after curing.

[0045] In other words, the shaped potting compound layer 29 securely connects the rectangular coil 23, rectangular metal core 24, transition trapezoidal coil 25, transition trapezoidal metal core 26, trapezoidal coil 27, and trapezoidal metal core 28 to the mounting plate 21, enhancing the overall structural robustness of the linear motor. After curing, the potting compound forms a hard solid that tightly wraps the coils and metal cores and bonds them to the mounting plate 21, preventing loosening or displacement during motor operation and improving the motor's structural stability and reliability. Furthermore, the motor is inevitably subject to vibration and impact during operation. The potting compound layer absorbs and disperses this vibration and impact energy, reducing damage to the coils and metal cores, protecting the motor's internal structure, and extending its service life. Additionally, the shaped potting compound layer 29 has excellent thermal conductivity, rapidly dissipating the heat generated by the coils and metal cores during operation. In a linear motor, the coils generate heat when energized; if this heat cannot be dissipated promptly, the coil temperature will rise, affecting the motor's performance and lifespan. The potting compound layer, acting as a heat conduction medium, transfers heat from the coil and metal core to the mounting plate 21, and then dissipates it into the surrounding environment through the mounting plate 21, effectively reducing the motor's operating temperature and improving its heat dissipation efficiency. Furthermore, the potting compound layer possesses excellent insulation properties, electrically isolating the coil and metal core from the external environment and other conductive components. In linear motors, where the coil and metal core operate under high voltage or high current, good insulation prevents electrical faults such as leakage and short circuits, ensuring the safe operation of the motor.

[0046] See Figures 1 to 5 As shown, in one embodiment, the moving part assembly 10 includes a bow support 11, a roller 12 and a wedge magnet 13. The roller 12 is connected to the bow support 11 and slidably connected to the guide rail 22. The wedge magnet 13 is connected to the bow support 11 and abuts against the shaped potting compound layer 29.

[0047] Specifically, the bow support 11, as the basic support structure of the mover assembly 10, needs to be made of high-strength, lightweight materials, such as aluminum alloy or carbon fiber composite materials, according to design requirements. It is machined into a specific shape through machining (such as milling, drilling, etc.) to ensure sufficient rigidity and stability. Positions for mounting the roller 12 and wedge magnet 13 are reserved on the bow support 11, and appropriate surface treatments, such as sandblasting and anodizing, are performed to improve its wear resistance and corrosion resistance. The roller 12 is installed onto the reserved positions on the bow support 11 using bearings and other connecting parts. Bolts can be used to fix the roller 12 to the bow support 11, and the position of the roller 12 can be fine-tuned by adjusting the tightness of the bolts to achieve optimal fit with the guide rail 22. The wedge magnet 13 typically uses high-performance permanent magnet materials, such as neodymium iron boron magnets. The wedge magnet 13 is connected to the bow support 11 by adhesive bonding or mechanical fixing, so that it abuts against the shaped potting compound layer 29.

[0048] Based on the specific operational requirements of the linear motor, such as load size, travel distance, and motion accuracy, parameters such as operating speed and thrust are set. These parameters can be input into the controller via a human-machine interface (HMI) or programming software. For example, if the motor needs to move heavy objects quickly, a higher operating speed and greater thrust are set; if precise control of the motor's position is required, a lower operating speed and smaller thrust fluctuations are set. The controller is the core control component of the linear motor, responsible for inputting the corresponding current into the stator coil (winding) to form a stator traveling wave magnetic field. Based on the set operating parameters, the controller calculates the required current magnitude, frequency, and phase information through its internal algorithm and converts it into control signals, which are then output to the driver. The driver provides the corresponding current to the stator coil according to the control signals, thereby generating the stator traveling wave magnetic field. After completing the assembly of the mover assembly 10 and the controller configuration, the linear motor is started. The controller inputs current into the stator coil to form the stator traveling wave magnetic field. The stator traveling wave magnetic field interacts with the air gap composite magnetic field generated by the wedge magnet 13, generating a driving force that drives the mover forward or backward. The operating parameters are adjusted and optimized based on the actual conditions during motor operation. For example, if the motor's operating speed is found to be unstable or the thrust fluctuates greatly, the magnitude and frequency of the input current can be adjusted appropriately, or the algorithm parameters of the controller can be optimized to improve the motor's operating performance.

[0049] In other words, by setting parameters such as operating speed and thrust through the controller and inputting a corresponding current into the stator coil to form a stator traveling wave magnetic field, the operating speed and thrust of the motor can be flexibly adjusted according to different application requirements. This allows the linear motor to adapt to various complex working conditions, such as rapid start-up, stopping, speed change, and precise thrust control, improving the motor's versatility and adaptability. Furthermore, the interaction between the wedge magnet 13 and the stator traveling wave magnetic field generates a relatively stable driving force, reducing speed fluctuations and vibrations during motor operation. Simultaneously, the sliding connection between the roller 12 and the guide rail 22 ensures the stability of the mover assembly 10 during movement, enabling the motor to operate at a more stable speed and acceleration, improving the equipment's operating accuracy and stability.

[0050] See Figures 1 to 5 As shown, in one embodiment, the bow support 11 is provided with a moving yoke plate 14, and the wedge magnet 13 is connected to the moving yoke plate 14.

[0051] Specifically, the moving yoke 14 is a key component connecting the wedge magnet 13, and its design must consider the connection method with the wedge magnet 13 and its installation fit with the bow support 11. The moving yoke 14 is typically made of a material with good magnetic permeability, such as electrical pure iron or silicon steel sheet, to enhance the magnetic permeability of the magnetic circuit and reduce magnetic resistance. The shape and structure of the moving yoke 14 are designed according to the shape and size of the wedge magnet 13 to ensure that the wedge magnet 13 can be tightly and stably connected to the moving yoke 14. The connection methods between the wedge magnet 13 and the moving yoke 14 include adhesive bonding, mechanical fixing (such as bolt connection, riveting, etc.), or a combination of both. Adhesive bonding has advantages such as strong connection and good sealing, and is suitable for occasions with high requirements for connection strength and sealing; mechanical fixing facilitates disassembly and replacement, and is suitable for situations requiring regular maintenance or replacement of the wedge magnet 13. In practical applications, a suitable connection method can be selected according to specific needs, or multiple connection methods can be combined to improve the reliability and stability of the connection. A position for installing the moving yoke plate 14 is reserved on the bow bracket 11, and a corresponding positioning structure, such as a positioning pin or a positioning groove, is designed to ensure that the moving yoke plate 14 can be accurately installed on the bow bracket 11. The moving yoke plate 14 can be fixed to the bow bracket 11 by welding, bolting, or other methods.

[0052] In other words, the mover yoke 14, made of a material with good magnetic permeability, can effectively guide and concentrate the magnetic field generated by the wedge magnet 13, reducing the magnetic resistance of the magnetic circuit and improving the strength and uniformity of the magnetic field. This helps to enhance the interaction between the stator traveling wave magnetic field and the air gap composite magnetic field generated by the wedge magnet 13, thereby improving the driving force and efficiency of the motor. Furthermore, the presence of the mover yoke 14 can effectively reduce the leakage flux of the wedge magnet 13, allowing more magnetic lines of force to concentrate in the air gap and interact with the stator traveling wave magnetic field, thus improving the utilization rate of the magnetic field and reducing the energy consumption of the motor. In addition, the wedge magnet 13 is connected to the bow support 11 through the mover yoke 14, forming a stable overall structure. As an intermediate connecting component, the mover yoke 14 can withstand various forces generated by the wedge magnet 13 during operation and evenly transmit them to the bow support 11, reducing the stress concentration problem that may occur when the wedge magnet 13 is directly connected to the bow support 11, and improving the structural stability and reliability of the mover assembly 10. In addition, since the mover yoke plate 14 enhances the uniformity and stability of the magnetic field, the interaction between the stator traveling wave magnetic field and the air gap composite magnetic field generated by the wedge magnet 13 is more stable, thereby reducing thrust fluctuations and vibrations during motor operation and improving the smoothness and accuracy of motor operation.

[0053] See Figures 3 to 5 As shown, in one embodiment, the bow support 11 is connected to a roller shaft 15, and the roller 12 is connected to the roller shaft 15.

[0054] Specifically, mounting holes are pre-machined on the bow support 11, and the roller shaft 15 is inserted into the mounting holes. An interference fit or transition fit can be used, and the roller shaft 15 is pressed into the bow support 11 using a press to ensure a tight connection between the roller shaft 15 and the bow support 11 without any loosening. To further improve the reliability of the connection, an appropriate amount of thread-locking agent can be applied to the mating surfaces of the roller shaft 15 and the bow support 11, or other anti-loosening measures can be adopted, such as installing elastic retaining rings. The roller 12 is then installed on the roller shaft 15, using the appropriate installation method depending on the connection method between the roller 12 and the roller shaft 15. If a bearing connection is used between the roller 12 and the roller shaft 15, the bearing is first installed in the inner hole of the roller 12, then the roller 12 with the bearing is fitted onto the roller shaft 15, and the roller 12 is fixed to the roller shaft 15 using a lock nut or snap ring, ensuring that the roller 12 can rotate freely without axial movement.

[0055] In other words, the roller 12 is connected to the bow support 11 via the roller shaft 15, enabling it to roll smoothly on the guide rail 22. This significantly reduces the sliding friction between the mover assembly 10 and the guide rail 22, lowering the impact of friction on motor operation. Simultaneously, the rolling motion of the roller 12 effectively absorbs and buffers vibrations generated during operation, making the movement of the mover assembly 10 smoother and improving the linear motor's operating accuracy and stability. The design of the roller shaft 15 and roller 12 ensures that the weight of the mover assembly 10 is evenly distributed across multiple rollers 12, avoiding deformation and wear caused by excessive localized stress. This uniform stress distribution helps extend the service life of the mover assembly 10 and reduces malfunctions caused by uneven stress. In addition, the reliable connection between the bow support 11 and the roller shaft 15, and between the roller shaft 15 and the roller 12, forms a stable load-bearing structure. The bow support 11 can provide sufficient support for the roller shaft 15, and the roller shaft 15 can transfer the weight of the mover assembly 10 and the force generated during operation to the roller 12, so that the entire mover assembly 10 can withstand a large load. This high-strength connection method makes the linear motor suitable for various heavy-duty working conditions, improving the versatility and reliability of the motor.

[0056] See Figure 4 As shown, in one embodiment, the upper and lower ends of the bow support 11 are provided with roller shafts 15 to form rollers 12 at the upper and lower ends to clamp the guide rail 22.

[0057] Specifically, the machined rollers 15 are installed into the upper and lower mounting holes of the bow support 11. An interference fit or a transition fit can be used, and the rollers 15 are pressed into the bow support 11 using a press to ensure a tight connection between the rollers 15 and the bow support 11 without any loosening. To further improve the reliability of the connection, an appropriate amount of thread-locking agent can be applied to the mating surfaces of the rollers 15 and the bow support 11, or other anti-loosening measures can be adopted, such as installing elastic retaining rings.

[0058] In other words, the upper and lower rollers 12 clamp the guide rail 22, forming an effective constraint mechanism that prevents the mover assembly 10 from shifting laterally during operation. Even when the linear motor is running at high speed or subjected to lateral forces, the mover assembly 10 can maintain a stable linear motion trajectory, improving the motor's operating accuracy and reliability. Furthermore, the clamping action of the upper and lower rollers 12 effectively absorbs and buffers vibrations and swaying generated during operation, making the movement of the mover assembly 10 smoother. This helps reduce noise caused by vibration and swaying and damage to internal motor components, extending the motor's service life. Additionally, the upper and lower rollers 12 jointly bear the weight of the mover assembly 10 and the forces generated during operation, evenly distributing the load on the guide rail 22. This avoids deformation and wear of the guide rail 22 due to excessive localized stress. This even load distribution improves the load-bearing capacity and service life of the guide rail 22, while also ensuring the stable operation of the mover assembly 10.

[0059] See Figure 6 As shown, in one embodiment, the wedge-shaped magnet 13 has four wedge angles symmetrically distributed.

[0060] Specifically, the wedge-shaped magnet 13 has four symmetrically distributed wedge angles β. The larger the proportion of the wedge angle length Lx to the magnet length, the smaller the wedge angle should be designed, i.e., the smaller the wedge angle width Wx should be. The value of the proportion of the wedge angle length Lx to the magnet length affects the thrust fluctuation and the magnitude of the thrust, and needs to be reasonably selected according to the design operating conditions of the motor.

[0061] More specifically, based on the overall dimensions, performance requirements, and installation space of the linear motor, the basic dimensions of the wedge magnet 13, including length, width, and height, are initially determined. During the design process, the distribution and size of the wedge angle β must be fully considered to ensure a symmetrical distribution of the four wedge angles, guaranteeing the symmetry and stability of the magnetic field. Through theoretical analysis and experimental verification, the relationship between the proportion of the wedge angle length Lx to the magnet length and the wedge angle width Wx is determined. For example, finite element analysis software is used to simulate the magnetic field of wedge magnets 13 with different wedge angle sizes, analyzing parameters such as magnetic field distribution, thrust magnitude, and thrust fluctuation. When the proportion of the wedge angle length Lx to the magnet length is large, the wedge angle width Wx should be designed to be smaller to ensure the uniformity and stability of the magnetic field and reduce thrust fluctuation. In specific design, the size range of the wedge angle length Lx and wedge angle width Wx can be initially determined based on the motor's design requirements and empirical formulas, and then the final dimensions can be determined through further optimization design. The value of the proportion of the wedge angle length Lx to the magnet length needs to be reasonably selected based on the motor's design operating conditions. If the motor has high requirements for thrust fluctuation, such as in precision machining equipment or high-precision positioning systems, a smaller wedge angle length Lx ratio should be selected to reduce thrust fluctuation. If the motor has high thrust requirements, such as in heavy-duty handling equipment, the wedge angle length Lx ratio can be appropriately increased to improve thrust, while ensuring that the thrust fluctuation is within an acceptable range. In the actual design process, prototypes with different wedge angle length Lx ratios can be fabricated for experimental testing, and the optimal wedge angle length Lx ratio can be determined based on the test results.

[0062] In other words, the symmetrically distributed wedge-shaped magnets 13 at their four wedge angles can generate a more uniform magnetic field. The rational design of the ratio of wedge angle length Lx to magnet length and the wedge angle width Wx can further optimize the magnetic field distribution, reduce magnetic field inhomogeneity, and thus improve motor performance. A uniform magnetic field helps improve the motor's driving force and efficiency, while reducing energy loss. Furthermore, the special shape and wedge angle design of the wedge-shaped magnets 13 can optimize the magnetic circuit structure, reduce magnetic resistance, and improve magnetic field utilization. By rationally designing the ratio of wedge angle length Lx, the magnetic lines of force can be more concentrated in the air gap, enhancing the interaction between the stator traveling wave magnetic field and the air gap composite magnetic field generated by the wedge-shaped magnets 13, thereby increasing the motor's thrust. Additionally, the rational combination of the ratio of wedge angle length Lx to magnet length and the wedge angle width Wx can effectively reduce thrust fluctuations. When the wedge length Lx accounts for a large proportion of the magnet length, a smaller wedge width Wx can make the magnetic field change more gradual, reduce sudden changes in thrust, and thus improve the smoothness and accuracy of motor operation. This is of great significance for some applications with high positional accuracy requirements, such as robot joints and CNC machine tools.

[0063] See Figure 7As shown, in one embodiment, the spacing between adjacent rectangular metal cores 24, transition trapezoidal metal cores 26 and / or trapezoidal metal cores 28 is equal.

[0064] Specifically, the spacing between adjacent iron cores (regardless of whether they are rectangular or trapezoidal) along the entire transmission line is the same, that is, the tooth pitch t is the same (the tooth pitch t is determined according to the operating conditions).

[0065] Among them, the included angle α between the two inner sides of the trapezoidal coil 27 is:

[0066]

[0067] The angle α / 2 between the two inner sides of the transition trapezoidal coil 25:

[0068]

[0069] Where R is the turning radius of the running trajectory; t is the distance between adjacent winding coils.

[0070] See Figure 8 As shown, in one embodiment, the sides of adjacent rectangular metal cores 24, transitional trapezoidal metal cores 26 and / or trapezoidal metal cores 28 are arranged in parallel.

[0071] Specifically, the sides of adjacent iron cores are parallel and equidistant (both are d), and when combined with the mover using wedge magnets 13, the thrust fluctuation of the linear motor output can be reduced, and the coils and iron cores of the stator are arranged more closely, that is, the gap between adjacent coils on the outer side of the arc segment is reduced, and the power density of the transmission line linear motor is increased.

[0072] In one embodiment, the rectangular metal core 24, the transitional trapezoidal metal core 26, and the trapezoidal metal core 28 are all iron cores.

[0073] Specifically, the high permeability of the iron core can effectively guide and concentrate the magnetic field, distributing it along the path of the iron core and reducing leakage and diffusion. The combined design of the rectangular metal core 24, the transition trapezoidal metal core 26, and the trapezoidal metal core 28 can optimize the distribution and intensity of the magnetic field according to the electromagnetic requirements of the motor, improving the electromagnetic conversion efficiency of the motor. For example, the transition trapezoidal metal core 26 can achieve a smooth transition of the magnetic field between iron cores of different shapes, reducing abrupt changes and losses in the magnetic field.

[0074] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A linear motor structure, characterized in that, It includes a mover assembly and a stator assembly. The stator assembly includes a mounting plate and a guide rail. The guide rail is arranged along the trajectory of the mounting plate. The mover assembly is slidably connected to the guide rail. The mounting plate is composed of a straight section, a transition section, and an arc section. The straight section is provided with a rectangular coil and a rectangular metal core with a rectangular cross-section. The transition section is provided with a transition trapezoidal coil and a transition trapezoidal metal core with a trapezoidal cross-section. The arc section is provided with a trapezoidal coil and a trapezoidal metal core with a trapezoidal cross-section.

2. The linear motor structure according to claim 1, characterized in that, The rectangular coil, the rectangular metal core, the transition trapezoidal coil, the transition trapezoidal metal core, the trapezoidal coil, and the trapezoidal metal core are arranged on the mounting plate and are fixedly connected by a shaped potting compound layer.

3. The linear motor structure according to claim 2, characterized in that, The moving part assembly includes a bow support, a roller, and a wedge magnet. The roller is connected to the bow support and slidably connected to the guide rail. The wedge magnet is connected to the bow support and abuts against the shaped potting compound layer.

4. The linear motor structure according to claim 3, characterized in that, The bow support is provided with a moving yoke plate, and the wedge-shaped magnet is connected to the moving yoke plate.

5. The linear motor structure according to claim 3, characterized in that, The bow support is connected to a roller shaft, and the roller is connected to the roller shaft.

6. The linear motor structure according to claim 5, characterized in that, The upper and lower ends of the bow support are provided with roller shafts to form rollers at the upper and lower ends that clamp the guide rail.

7. The linear motor structure according to claim 3, characterized in that, The wedge-shaped magnet has four wedge angles symmetrically distributed.

8. The linear motor structure according to claim 1, characterized in that, The spacing between adjacent rectangular metal cores, transition trapezoidal metal cores, and / or trapezoidal metal cores is equal.

9. The linear motor structure according to claim 8, characterized in that, The sides of adjacent rectangular metal cores, transition trapezoidal metal cores, and / or trapezoidal metal cores are arranged in parallel.

10. The linear motor structure according to claim 1, characterized in that, The rectangular metal core, the transitional trapezoidal metal core, and the trapezoidal metal core are all iron cores.

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