Split cylinder core, primary assembly and linear motor

Abstract

This utility model relates to an assembled cylindrical iron core, a primary component, and a linear motor. Extending axially, its cross-section is a polygonal ring, with the outer ring's edges corresponding to the inner ring's edges. The iron core is formed by sequentially assembling multiple core units circumferentially. Each core unit has a quadrilateral cross-section, with a first, second, third, and fourth side in sequence. The first and third sides are parallel, with the first side located inside the assembled cylindrical iron core and the third side located outside. The surfaces containing the second and fourth sides of each core unit are coated with an insulating layer. This utility model is based on the idea of ​​assembling a polygonal linear motor from flat linear motors. By segmenting and cutting the eddy current loop, it actively reduces eddy current losses, lowers thrust loss and eddy current losses under high operating speeds, and optimizes motor heating.

Description

Technical Field

[0001] This utility model belongs to the field of linear motor technology, specifically relating to an assembled cylindrical iron core, a primary component, and a linear motor. Background Technology

[0002] A flat linear motor is an electromagnetic device that directly converts electrical energy into linear motion. Due to its unique design characteristics and performance advantages, it occupies an important position in modern industrial automation, high-end manufacturing, transportation, and other fields. However, flat linear motors also suffer from problems such as low thrust density, difficulty in thermal management under high-power conditions, strong attraction between the moving and stators, and strong magnetic field interference.

[0003] In recent years, cylindrical linear motors have seen continuous development. These motors have higher magnetic field utilization and thrust density, and their axisymmetric structure can reduce end effects and the attraction between the stator and mover. This structure is also beneficial for designing heat dissipation paths. For example, Chinese patent CN118136365A provides a linear motor based on a Halbach array magnetic component, secondary component, and secondary component, wherein the iron core is cylindrical and the secondary component is annular.

[0004] However, since the stator of a cylindrical DC motor is ring-shaped, it cannot be obtained by stacking silicon steel sheets of uniform thickness. Therefore, it is impossible to effectively reduce the eddy current loss of the eddy current main circuit, which makes it difficult to meet the requirements of small installation volume, high thrust and low loss application scenarios, such as electric vehicle electromagnetic suspension system. Utility Model Content

[0005] This invention provides a composite cylindrical iron core, a primary component, and a linear motor to solve the technical problem of high eddy current loss in current cylindrical linear motors.

[0006] To solve the above-mentioned technical problems, this utility model provides an assembled cylindrical iron core, which extends axially and has a polygonal ring cross-section. The edges of the outer ring correspond one-to-one with the edges of the inner ring. The iron core is composed of multiple iron core units sequentially assembled into a cylinder along the circumference. The cross-section of each iron core unit is quadrilateral, and each cross-section includes a first side, a second side, a third side, and a fourth side in sequence. The first side and the third side are parallel. The first side is located on the inner side of the assembled cylindrical iron core, and the third side is located on the outer side of the assembled cylindrical iron core. The surfaces of the second and fourth sides of the iron core unit are provided with an insulating coating.

[0007] Optionally, the first and third sides of all core units have different lengths.

[0008] Optionally, the polygonal ring has 5-12 sides, preferably 6-8 sides.

[0009] Optionally, the second side and the fourth side have the same length.

[0010] Optionally, the length of the first side of all core units is less than the length of the third side.

[0011] Optionally, the core unit is formed by stacking silicon steel sheets along the length direction of the first side.

[0012] Optionally, when the lengths of the first and third sides of the core unit are different, the preparation method is as follows: the thickness of the silicon steel sheets is stacked according to the length of the longer side to obtain a flat core, and then the second and fourth sides are used as cutting lines to cut along the axial direction.

[0013] This utility model also provides a primary component, which includes the above-mentioned assembled cylindrical iron core and winding. The winding includes multiple coils. The outer side of each iron core unit is provided with multiple axially distributed stator teeth. A receiving groove is formed between two adjacent stator teeth. The receiving grooves at corresponding positions of all iron core units are connected to form an annular groove. The coil is disposed in the groove.

[0014] Optionally, it also includes a support structure located at the center of the assembled cylindrical iron core.

[0015] Optionally, the coil is a polygonal ring, and multiple coils of the same phase are connected in series from the corresponding apex of the polygon to the power supply conductor.

[0016] Optionally, the winding is a flat wire winding or a copper block winding.

[0017] Optionally, at least one of the two outer side ribs of the core unit is provided with a clearance notch to accommodate the power supply conductor.

[0018] Optionally, two adjacent core units are connected by edge ribs with clearance notches.

[0019] This utility model also provides a linear motor, which includes the aforementioned primary component and secondary component; the secondary component includes a magnetic element surrounding a composite cylindrical iron core, a housing, and a guide rod inserted into the center of the composite cylindrical iron core, the magnetic element being installed in the housing, the guide rod being disposed within the housing and at least partially connected to the housing, the primary component cooperating with the magnetic element to cause the guide rod of the secondary component to drive the housing of the secondary component to move relative to the primary component.

[0020] Optionally, the magnetic component is a polygonal cylindrical magnetic component formed by sequentially splicing multiple plate-shaped magnetic sheets along the circumference, with each magnetic sheet corresponding to a core unit.

[0021] Optionally, an air gap is provided between adjacent magnetic sheets.

[0022] Optionally, the magnetic sheet is formed by stacking multiple sheet-shaped permanent magnets along the axial direction.

[0023] Optionally, the cross-section of the permanent magnet is trapezoidal, and the cross-section includes a fifth side, a sixth side, a seventh side and an eighth side in sequence. The fifth side is parallel to the seventh side, the surface where the fifth side is located is close to the core unit, the seventh side is far away from the core unit, and the length of the fifth side is less than that of the seventh side.

[0024] Optionally, the permanent magnets are arranged in a Halbach array along the axial direction.

[0025] This invention is based on the idea of ​​splicing and combining flat linear motors into polygonal linear motors. With the aim of reducing eddy current losses and installation difficulty, and realizing modular production of motors, it proposes a design and manufacturing method for a spliced ​​cylindrical iron core, primary components and linear motor. This invention actively reduces eddy current losses by segmenting and cutting off the eddy current loop, reduces thrust loss and eddy current losses under high operating speed conditions, and optimizes the motor heating problem. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of a specific embodiment of the assembled cylindrical iron core described in this utility model;

[0027] Figure 2 yes Figure 1 Cross-sectional view;

[0028] Figure 3 This is a structural schematic diagram of another specific embodiment of the assembled cylindrical iron core described in this utility model;

[0029] Figure 4 This is a structural schematic diagram of a specific embodiment of the iron core unit described in this utility model;

[0030] Figure 5 This is a schematic diagram of a specific embodiment of the manufacturing process of the iron core unit described in this utility model;

[0031] Figure 6 This is a structural schematic diagram of a specific embodiment of the primary component described in this utility model;

[0032] Figure 7 This is a structural schematic diagram of a specific embodiment of the A-direction winding described in this utility model;

[0033] Figure 8 This is a structural schematic diagram of a specific embodiment of the winding described in this utility model;

[0034] Figure 9 This is a cross-sectional view of a specific embodiment of the linear motor described in this utility model;

[0035] Figure 10 This is a top view of the primary and secondary components of this utility model in combination;

[0036] Figure 11 yes Figure 10 A schematic diagram of the magnetization status of a group of permanent magnets after cross-section of the DD phase;

[0037] Figure 12 This is a simulation test comparison diagram of the force-speed curves of the linear motor described in this utility model and a traditional cylindrical linear motor;

[0038] Figure 13 This is a comparison diagram of the thrust simulation test between the linear motor described in this utility model and a traditional cylindrical linear motor at a running speed of 0.1 m / s. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0040] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation and positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] like Figure 1 and 2As shown, this utility model provides a modular cylindrical iron core 10, which extends axially and has a hexagonal ring cross-section. Due to the avoidance notch design, the cross-sectional view in the figure can be understood as a transformation based on the hexagonal ring completed by dashed lines. Subsequently, the six sides of the outer ring 11 correspond one-to-one with the six sides of the inner ring 12. The iron core 10 is formed by sequentially splicing six iron core units 13 circumferentially into a cylinder. Considering the cost and simplicity of production and processing, the six iron core units 13 in this embodiment have the same structure and dimensions. It should be noted that as long as they can be spliced ​​into a cylinder, the structure and dimensions of the six iron core units 13 do not have to be exactly the same. For example... Figure 3 The cross-section of the iron core 10 shown is a decagonal ring, in which 5 iron core units 13 are rectangular and 5 iron core units are trapezoidal, with completely different structures and dimensions.

[0043] See also Figure 2 The core unit 13 has a quadrilateral cross-section, consisting of a first side 131, a second side 132, a third side 133, and a fourth side 132. The first side 131 is parallel to the third side 133, and the length of the first side 131 is less than that of the third side 133. The lengths of the second side 132 and the fourth side 132 are equal. In short, the cross-section of the core unit 13 in this embodiment is an isosceles trapezoid. The dimensions of this isosceles trapezoid are: the first side 131 (upper base) is 8.66 mm, the third side 133 (lower base) is 46.38 mm, and the height is 32.66 mm. Furthermore, the first side 131 is located inside the assembled cylindrical core 10, and the third side 133 is located outside the assembled cylindrical core 10. The surfaces containing the second side 132 and the fourth side 132 of the core unit, i.e., the two assembled sides, are provided with an insulating coating. Since the first side 131 and the third side 133 are parallel, it is most convenient to use silicon steel sheets of the same width for subsequent stacking.

[0044] It should be noted that the core unit 13 can also have its longer side on the inside and its shorter side on the outside, meaning the first side is longer than the third side. However, since it needs to be folded into a cylinder, the polygonal ring of the core 10 must have an inner ring side shorter than the outer ring side. Therefore, if the first side of some core units 13 is longer than the third side, then there must also be some core units 13 whose first side is shorter than the third side. Or as... Figure 3 The middle section has a rectangular cross-section, and the first and third sides are the same length. In general, any multiple core units 13 with quadrilateral cross-sections that can be assembled to form a polygonal cylindrical core with a polygonal ring cross-section fall under the utility model concept of this application.

[0045] like Figure 4As shown, the core unit 13 is 200mm long, and its outer surface is provided with multiple axially distributed stator teeth 134. In this embodiment, there are 13 stator teeth 134. A receiving groove 135 is formed between two adjacent stator teeth 134, that is, a total of 12 receiving grooves 135. In this embodiment, the groove thickness is 10mm and the groove depth is 25mm. See also... Figure 1 All the corresponding receiving slots 135 of the core units 13 are connected to form an annular groove for accommodating the windings. It should be noted that the core units 13 in this embodiment have the same structure, so the corresponding receiving slots 135 are slots with the same height. However, in some other embodiments, if the core units 13 are not completely identical, and the number or height of the positioning teeth 134 and the receiving slots 135 are not the same, the meaning of the corresponding receiving slots 135 is that the multiple coils surrounding the core 10 do not cross each other, and one coil passes through the receiving slots 135 in each core unit 13 in sequence.

[0046] See also Figure 1 , 2 4. The outer side edge of the core unit 13 is provided with a clearance notch 136 for accommodating the power supply conductor, and the edges of two adjacent core units 13 with clearance notches 136 are connected.

[0047] like Figure 5 As shown, the processing method of the core unit 13 is as follows: the thickness of the silicon steel sheet 137 is stacked according to the length of the third side 133, and a flat core 138 is formed by stacking along the length direction of the first side 131, which is the third side 133. Then, the core 139 with a trapezoidal cross section is cut along the axial direction using the second side 132 and the fourth side 134 as cutting lines. Finally, design details such as the receiving groove 135 and the clearance notch 136 are cut on the outer side of the core 139.

[0048] It should be noted that if the cross-section of some core units 13 in the core 10 is rectangular, it is actually a flat linear motor, which can be directly produced and processed with reference to existing technology. Of course, it needs to be made by stacking silicon steel sheets along the length direction of the first side.

[0049] like Figure 6 and 7 As shown, the primary component 100 of this application embodiment includes the assembled cylindrical iron core 10 of the above embodiment, and also includes a winding 20 and a support structure (not shown in the figure) placed at the center of the assembled cylindrical iron core 10. The winding 20 includes a plurality of coils and a power supply conductor that realizes the electrical connection between the coils.

[0050] The support structure can be set up with reference to the support structure of the inner stator and outer mover type cylindrical linear motor in the prior art, and will not be described in detail here. The assembled cylindrical iron core 10 is fixed to each other by adhesive insulating material and windings.

[0051] Figure 6 In the composite cylindrical iron core 10, only some of the 12 annular grooves contain coils. The coil cross-section within each annular groove is 1.875mm × 20mm. Each receiving slot 135 contains a coil group 210 comprising 4 turns of flat wire or copper block. A 0.45mm insulation gap (i.e., 0.45mm of insulating varnish) is provided between the coils within the grooves and between the coils and the iron core. In this embodiment, the winding portion consists of a three-phase winding. Figure 7 The A-phase winding is shown in the middle. Taking the A-phase winding as an example, it includes, from top to bottom, a first layer coil group 211, a fourth layer coil group 212, a seventh layer coil group 213, a tenth layer coil group 214, a first power supply conductor 221, a second power supply conductor 222, and a connecting power supply conductor 223. The first power supply conductor 221 connects the first layer coil group 211 and the fourth layer coil group 212, and the second power supply conductor 222 connects the seventh layer coil group 213 and the tenth layer coil group 214.

[0052] like Figure 8 As shown, the coils are arranged along the outer shape of the grooves, also in a hexagonal ring shape. The 12-layer coil group includes the A-phase winding, as well as the B-phase and C-phase windings. The B-phase winding involves the second, fifth, eighth, and eleventh layer coil groups and the corresponding first, second, and connecting power supply conductors. The C-phase winding involves the third, sixth, ninth, and twelfth layer coil groups and the corresponding first, second, and connecting power supply conductors. Roughly speaking, the 12-layer coil group is divided into 3 groups, each group involving 4 coil groups, with each phase winding coil group sequentially arranged within the 12-layer groove.

[0053] See also Figure 6 Each core unit 13 has a clearance notch 136 on one outer edge. The edges of two adjacent core units 13 with clearance notches 136 connect to form three M-shaped notches. Each notch can accommodate the power supply conductor in one phase winding. Specifically, the power supply conductor enters from the top clearance notch 136, sequentially connecting the first power supply conductor 221 and the second power supply conductor 222 in series, and finally exits from the bottom clearance notch 136. This notch provides sufficient space for the power supply conductor, preventing it from protruding from the surface of the hexagonal cylinder formed by the assembled cylindrical core 10 and thus not hindering the placement of the magnetic material.

[0054] like Figure 9As shown, the primary component 100 of this application is applied to a linear motor 1000, which includes the aforementioned primary component 100 and secondary component 300; the secondary component 300 includes a magnetic element 31 surrounding the assembled cylindrical iron core 10, a housing 32, and a guide rod 33 inserted into the center of the assembled cylindrical iron core 10. The magnetic element 31 is installed in the housing 32, and the guide rod 33 is disposed in the housing 32 and at least partially connected to the housing 32. The primary component 100 cooperates with the magnetic element 31 so that the guide rod 33 of the secondary component 300 drives the housing 32 of the secondary component 300 to move relative to the primary component 100.

[0055] like Figure 10 As shown, the magnetic component 31 is a hexagonal cylindrical magnetic component 31 formed by sequentially splicing six plate-shaped magnetic sheets 311 along the circumference. Each magnetic sheet 311 corresponds to an iron core unit 13, and an air gap 34 is provided between adjacent magnetic sheets 311.

[0056] See also Figure 9 The magnetic sheet 311 is formed by stacking 68 sheet-like permanent magnets axially, with the 68 permanent magnets arranged in a Halbach array along the axial direction. The permanent magnets have thicknesses of 5mm and 4.5mm. The 5mm thick permanent magnets are axially magnetized, while the 4.5mm thick permanent magnets are radially magnetized. Axial and radial magnetization are alternately arranged, with four permanent magnets forming a group, and 17 groups of permanent magnets are arranged along the axial direction of the motor. Figure 11 As shown, taking one group as an example, the first permanent magnet 3111 is magnetized axially downwards, the second permanent magnet 3112 is magnetized radially inwards, the third permanent magnet 3113 is magnetized axially upwards, and the fourth permanent magnet 3114 is magnetized radially outwards. This ensures that the mover can generate a large magnetic field, the air gap magnetic flux density waveform has a good sinusoidal distribution, the harmonic content is reduced, and the magnetic field near the air gap is enhanced while the magnetic field away from the air gap is weakened. This enhances the electromagnetic air gap flux, reduces the magnetic flux of the yoke, and enhances the unilateral magnetic focusing ability of the permanent magnet, thereby increasing the thrust density.

[0057] See also Figure 10 The permanent magnet has a trapezoidal cross-section, which includes a fifth side 3115, a sixth side 3116, a seventh side 3117, and an eighth side 3118. The fifth side 3115 is parallel to the seventh side 3117. The surface containing the fifth side 3115 is close to the core unit 13, while the seventh side 3117 is far from the core unit 13. The side length of the fifth side 3115 is less than that of the seventh side 3117.

[0058] This invention is based on the idea of ​​splicing and combining flat linear motors into polygonal linear motors, which solves the problem of applying silicon steel sheets in cylindrical linear motors. This stacking method takes into account heat dissipation and performance, while greatly reducing iron loss caused by eddy currents, so that the input electrical energy is converted into mechanical energy to the maximum extent and the thrust is improved.

[0059] like Figure 12 and 13 As shown, it can be observed that the thrust of the linear motor decreases with increasing operating speed. This is because increased speed leads to increased eddy current losses in the motor, reducing motor efficiency and thus thrust. However, the decrease in the motor force-speed curve in this embodiment is smaller, ensuring stable thrust under high-speed operation and rapid response conditions, reducing eddy current losses, and improving motor efficiency. However, at low speeds such as 0.1 m / s, due to the smaller eddy current losses, the thrust of this embodiment is smaller compared to that of a traditional cylindrical linear motor.

[0060] Finally, it should be noted that 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 should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A composite cylindrical iron core, characterized in that, Extending axially, the cross-section is a polygonal ring, with the outer ring's edge corresponding to the inner ring's edge. The core is composed of multiple core units sequentially spliced ​​together circumferentially to form a cylinder. The cross-section of each core unit is quadrilateral, with each cross-section including a first side, a second side, a third side, and a fourth side. The first side and the third side are parallel. The first side is located inside the spliced ​​cylindrical core, and the third side is located outside the spliced ​​cylindrical core. The surfaces containing the second and fourth sides of the core unit are provided with an insulating coating.

2. The assembled cylindrical iron core according to claim 1, characterized in that, The first and third sides of all core units have different lengths.

3. The split cylinder core of claim 2, wherein The second side and the fourth side have the same length.

4. The split cylinder core of claim 2, wherein The length of the first side of all core units is less than that of the third side.

5. The assembled cylindrical iron core according to claim 1, characterized in that, The core unit is formed by stacking silicon steel sheets along the length of the first side.

6. The split cylinder core of claim 1, wherein The polygonal ring has 5-12 sides.

7. A primary assembly, characterized by The invention includes the composite cylindrical iron core and winding as described in any one of claims 1-6. The winding includes multiple coils. The outer surface of each iron core unit is provided with multiple axially distributed stator teeth. A receiving groove is formed between two adjacent stator teeth. The receiving grooves at corresponding positions of all iron core units are connected to form an annular groove. The coil is disposed in the groove.

8. The primary assembly of claim 7, wherein, The outer side of the iron core unit has at least one clearance notch on both sides to accommodate the power supply conductor.

9. A linear motor, characterized by It includes the primary component and secondary component as described in claim 7 or 8; the secondary component includes a magnetic element surrounding the assembled cylindrical iron core, a housing, and a guide rod inserted into the center of the assembled cylindrical iron core, the magnetic element being mounted in the housing, the guide rod being disposed within the housing and at least partially connected to the housing, the primary component cooperating with the magnetic element to cause the guide rod of the secondary component to drive the housing of the secondary component to move relative to the primary component.

10. The linear motor of claim 9, wherein, The magnetic component is a polygonal cylindrical magnetic component formed by sequentially splicing multiple plate-shaped magnetic sheets along the circumference, and each magnetic sheet corresponds to a core unit.

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