Segmented pre-assembled lamination yoke mounting method and structure

Abstract

The application discloses a segmented preassembled lamination yoke mounting method, which comprises a segmented yoke preassembling stage, a transfer stage and a site installation stage: a simulated rotor support tooling is arranged in a yoke punching sheet, the simulated rotor support tooling is arranged with a simulated stud according to requirements, the simulated stud is matched with a yoke key groove on the inner side of the yoke punching sheet, and the position of the simulated rotor support tooling is adjusted; a lower pressing plate of the segmented yoke is placed on the simulated stud hook; the yoke punching sheet is stacked on the lower pressing plate, when the yoke punching sheet is stacked to a designed height, the uppermost yoke punching sheet is covered with an upper pressing plate, and a small segment tightening screw rod and a small segment tightening nut are fixed; when being transferred to a site for installation, the position of a normal rotor support is adjusted; the segmented yoke is sleeved into the normal rotor support, and the concentricity of the first segmented yoke is adjusted to be consistent with that of the normal rotor support. Compared with a traditional site lamination yoke structure, the application has the characteristics of shortening a site installation period, reducing a site yoke installation labor intensity and reducing segmented yoke manufacturing costs.

Description

Technical Field

[0001] This invention relates to the field of laminated magnetic yoke technology, and particularly to a method and structure for installing segmented pre-assembled laminated magnetic yokes. Background Technology

[0002] As a crucial component of the generator rotor, the magnetic yoke serves two purposes: firstly, it forms part of the stator-rotor magnetic circuit, creating a closed magnetic circuit between the stator and rotor; secondly, it acts as a fixing component for the magnetic poles, bearing the centrifugal force of the magnetic poles during unit operation while ensuring that the yoke does not undergo harmful deformation. Therefore, the magnetic yoke requires sufficient rigidity and strength. The magnetic yoke is fixed to the rotor support ribs by magnetic yoke keys.

[0003] Traditional magnetic yokes employ a laminated structure, where the entire axial height of the yoke is constructed by stacking thin steel plates of a certain thickness (typically 4mm thick). Each layer of the yoke consists of multiple yoke laminations forming a complete circle. Adjacent layers of yoke laminations are stacked in an alternating manner to ensure that the seams of the laminations on the circumference avoid each other, thereby enhancing the overall integrity of the yoke. This structure is typically installed on-site using a lamination stacking method. To ensure effective yoke compression, pre-compression tools are usually used to pre-compress the yoke in sections, and then the entire yoke is tightened after all laminations are completed.

[0004] In recent years, with the development of hydro-generators towards higher speeds and larger capacities, integral ring magnetic yoke structures have emerged. Patent publication CN109921526B describes a ring-shaped forged magnetic yoke structure. This magnetic yoke is composed of integral ring forgings on its circumference and several segments of forged magnetic yoke rings along its axial direction. These segments are then joined together as a single unit by a continuous axial tensioning screw.

[0005] Both of the aforementioned yoke structures have their advantages and disadvantages. Traditional laminated yoke structures are manufactured using laser cutting, resulting in high lamination efficiency and a short manufacturing cycle. Furthermore, the mechanical properties of the yoke laminations can be improved to meet the high-strength requirements of high-speed units (currently, the tensile strength of yoke laminations can reach 1000 MPa). Simultaneously, the laminated yoke can create ventilation gaps between adjacent laminations on its circumference, thereby enhancing rotor cooling. However, traditional laminated yokes can only be installed on-site, which involves a large workload and requires adjustments to the center and segmented pre-loading during the lamination process, resulting in a longer on-site lamination cycle.

[0006] The solid ring forged structure is the opposite. Because the yoke is a segmented structure, on-site installation only requires stacking the segments, greatly reducing the on-site yoke installation cycle. However, the yoke material is a thick forging, and its mechanical properties are not easily improved due to thickness limitations. At the same time, the raw material is expensive, increasing manufacturing costs. In addition, since the yoke segment is a solid forging, ventilation gaps cannot be formed within the segment, resulting in less uniform rotor cooling compared to laminated yokes.

[0007] Therefore, when installing laminated magnetic yokes, it is necessary to shorten the overall installation cycle and reduce the difficulty of on-site construction while retaining the advantages of traditional laminated magnetic yokes, so as to provide a better technical solution for the field of large motor manufacturing. Summary of the Invention

[0008] To address the shortcomings of the existing technology, this invention provides a stacked magnetic yoke installation method that combines efficient pre-assembly in the factory with rapid on-site assembly, shortening the overall installation cycle, and a segmented pre-assembly stacked magnetic yoke structure with high mechanical strength, low manufacturing cost, and uniform ventilation and cooling.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a method for installing a segmented pre-assembled laminated magnetic yoke, comprising a segmented magnetic yoke pre-assembly stage, a segmented magnetic yoke transfer stage, and an on-site installation stage; The segmented magnetic yoke pre-assembly stage includes the following steps: A1. A simulated rotor support fixture is arranged at the inner circle position of the magnetic yoke lamination. The simulated rotor support fixture is evenly arranged with simulated vertical ribs according to the number of vertical ribs of the main rotor support. The circumferential cross-sectional dimensions of the simulated vertical ribs are matched with the magnetic yoke keyway on the inner side of the magnetic yoke lamination. The position of the simulated rotor support fixture is adjusted to ensure that the horizontality of the simulated vertical rib hook meets the installation standard. A2. Place the lower pressure plate of the segmented magnetic yoke onto the simulated vertical rib hook; A3. Using the simulated vertical rib as the positioning reference, stack the magnetic yoke punches on the lower pressure plate. When the magnetic yoke punches are stacked to the designed height, cover the top magnetic yoke punch with the upper pressure plate, and tighten the magnetic yoke punches, lower pressure plate and upper pressure plate with small section tightening screws and small section tightening nuts to complete the pre-assembly of a segmented magnetic yoke. Repeat steps A1-A3 above to pre-assemble the multi-segmented magnetic yoke; The segmented magnetic yoke transport stage refers to transporting a set number of segmented magnetic yokes to the usage site; The on-site installation stage refers to assembling the multi-segmented magnetic yoke onto the upright rotor bracket at the usage site to complete the rotor assembly; specifically, it includes the following steps: A4, adjust the position of the upright rotor bracket to ensure that the levelness of the upright rib hooks meets the installation standards; A5. Fit the segmented magnetic yoke into the upright rotor bracket and adjust the concentricity of the first segmented magnetic yoke with the upright rotor bracket. A6. After assembling the set number of segmented magnetic yokes onto the upright rotor bracket according to the steps A4-A5 above, the on-site assembly of the magnetic yokes is completed.

[0010] Furthermore, in step A5, the concentricity adjustment of the first segment magnetic yoke and the upright rotor support includes: A51. Insert a pair of short tangential adjustment keys into each of the four vertical ribs spaced 90 degrees apart on the outside of the upright ribs of the rotor support to adjust the circumferential position of the yoke. A52. Drive wedge-shaped adjustment keys into the radial keyways of the vertical ribs on the outside of each upright rotor support. Temporarily spot weld the wedge-shaped adjustment keys to the bottom surface of the vertical ribs. Remove them after all the segmented yokes are stacked to ensure that the first segmented yoke remains stationary throughout the entire yoke installation process. A53. When installing the remaining segmented yokes, place an inter-segment fixing tool in the keyway of each magnetic pole T between adjacent segmented yokes to ensure that each segmented yoke remains concentric until all segments of the yoke are stacked.

[0011] Furthermore, adjust the circumferential position of the yoke to MaxB-MinB≤0.30mm.

[0012] This invention also discloses a segmented pre-assembled stacked magnetic yoke structure installed using the above-mentioned segmented pre-assembled stacked magnetic yoke installation method. The structure includes segmented magnetic yokes, each segmented magnetic yoke comprising a lower pressure plate, magnetic yoke laminations, an upper pressure plate, and small-segment tightening screws and nuts. The small-segment tightening screws and nuts are used to press several axially stacked magnetic yoke laminations together to form segmented magnetic yokes. The upper pressure plate and / or lower pressure plate of the segmented magnetic yoke have air guide strips on their non-magnetic yoke lamination contact surfaces, with the air guide strips located circumferentially opposite the magnetic pole region. Several segmented magnetic yokes are axially stacked, and each segmented magnetic yoke is tightened by a continuous tensioning screw passing through it and a nut cooperating with the continuous tensioning screw to form a complete magnetic yoke. A ventilation groove formed by the air guide strips exists between axially adjacent segmented magnetic yokes. Magnetic pole T-tail keyways are machined on the outer side of each magnetic yoke lamination, and magnetic yoke keyways are machined on the inner side.

[0013] Furthermore, the air guide belt includes air guide plate groups fixed to the non-magnetic yoke lamination contact surfaces of the upper and / or lower pressure plates of the segmented magnetic yoke. The air guide plate groups are evenly distributed on the circumference, and the air guide belt is formed between two adjacent air guide plate groups.

[0014] Furthermore, the segmented magnetic yoke has two air guide plates arranged opposite each other, with one side of the two air guide plates converging towards the inner diameter of the segmented magnetic yoke, and the height of the air guide plates being higher than the height of the small section tightening screw extending out of the upper and lower pressure plates.

[0015] Furthermore, the air guide plate assembly of the segmented magnetic yoke is an E-shaped air guide plate, which includes a middle extension section and two side extension sections. The two side extension sections extend from one end of the middle extension section located in the magnetic yoke keyway to the corresponding side to the magnetic pole T tail keyway.

[0016] Furthermore, the segmented magnetic yoke is equipped with an inter-segment fixing tool, which includes an inner groove shim, an outer groove shim, a cylindrical pin, a double-ended stud, and a nut. The inner groove shim is located in the keyway of the magnetic pole T. One end of the double-ended stud is connected to the inner groove shim located in the keyway of the magnetic pole T, and the other end is connected to the outer groove shim located outside the keyway of the magnetic pole T. The inner groove shim, the outer groove shim, and the cylindrical pin located on both sides of the inner groove shim are tightened by the double-ended stud and the locking nut. In summary, the present invention has the following beneficial effects: 1. Compared to traditional laminated magnetic yokes, which can only be installed on-site and require on-site operations such as lamination, center adjustment, and segmented pre-compression, resulting in a large workload and long on-site installation period, this invention overcomes the limitation of traditional laminated magnetic yokes that can only be installed on-site. By designing the magnetic yoke as a modular structure that can be pre-assembled in segments in the factory, and then transporting it to the construction site, compared to the traditional laminated structure, on-site installation of the magnetic yoke only requires assembling the magnetic yoke segments, eliminating the work of lamination and segmented pre-compression, thereby significantly reducing the workload and time of on-site installation.

[0017] 2. Compared to traditional magnetic yokes, which require the entire yoke to be installed at the manufacturing plant, making it difficult to guarantee the positioning accuracy of the yoke installation position due to the lack of a physical rotor support, this invention uses a tool-based dummy shaft positioning and installation method. By simulating the positioning reference of the rotor support, it ensures the positional accuracy during the lamination process in the factory, thus solving the positioning and installation problem during the pre-assembly process.

[0018] 3. The present invention uses axially stacked magnetic yoke laminations to form segmented magnetic yokes, and then stacks each segmented magnetic yoke axially to form a complete magnetic yoke. This stacked magnetic yoke structure has the high strength of traditional stacked magnetic yoke laminations, better compression effect after the magnetic yoke segments are tightened, and higher overall integrity.

[0019] 4. The segmented magnetic yoke of the present invention can form a large number of small ventilation gaps by stacking, thereby forming a ventilation structure with inter-segment ventilation grooves and intra-segment ventilation gaps. Compared with the forged structure magnetic yoke segment with only inter-segment ventilation grooves, the ventilation is more uniform.

[0020] 5. This invention improves mechanical strength. The stress high point of the magnetic yoke appears at the T-tail groove of the magnetic pole. The T-tail groove of the magnetic pole can be designed into a relatively complex irregular structure to reduce stress. It is easier to meet the requirements of high-strength magnetic yoke by improving the mechanical properties of the stamping. At the same time, the magnetic yoke uses thin steel plate, and the material price is much lower than that of thick forgings, which makes the segmented manufacturing cost of the magnetic yoke low. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the segmented pre-assembled laminated magnetic yoke segment structure.

[0022] Figure 2This is an enlarged view of the upper pressure plate and point A on the upper pressure plate.

[0023] Figure 3 This is a schematic diagram of the segmented stacking fixture for magnetic yokes in the factory.

[0024] Figure 4 This is a schematic diagram of a segmented magnetic yoke assembly for a construction site.

[0025] Figure 5 This is a schematic diagram of the concentricity adjustment of the first magnetic yoke segment.

[0026] Figure 6 This is a schematic diagram of the first magnetic yoke segment being fixed.

[0027] Figure 7 This is an enlarged view showing the adjustment of the concentricity of the magnetic yoke between adjacent segments and point B.

[0028] Figure 8 for Figure 7 Sectional view along the DD direction.

[0029] The reference numerals in the attached drawings are explained as follows: 1. Segmented magnetic yoke; 11. Lower pressure plate; 12. Magnetic yoke lamination; 13. Upper pressure plate; 14. Magnetic pole T-tail keyway; 15. Magnetic yoke keyway; 2. Air guide plate; 3. Small segment tightening nut; 4. Small segment tightening screw; 5. Simulated rotor support fixture; 51. Simulated vertical rib; 52. Cylinder; 6. Inter-segment fixing tool; 61. Double-ended stud; 62. Locking nut; 63. External slot shim; 64. Cylindrical pin; 65. Internal slot shim; 66. Lifting eye screw; 7. Tangential adjustment key; 8. Wedge-shaped adjustment key; 9. Upright rotor support vertical rib. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the embodiments.

[0031] like Figure 1 and Figure 4 As shown, the segmented pre-assembled stacked magnetic yoke structure in this embodiment includes a segmented magnetic yoke 1. The segmented magnetic yoke 1 specifically includes a lower pressure plate 11, magnetic yoke punches 12, an upper pressure plate 13, and a small-segment tightening screw 4. Each magnetic yoke punch 12 has several tensioning screw mounting holes for tightening the magnetic yoke segments. The small-segment tightening screw 4 is used to press several axially stacked magnetic yoke punches 12 to form a segmented magnetic yoke 1. Each segmented magnetic yoke 1 is tightened by a continuous tensioning screw passing through each segmented magnetic yoke 1 and a nut that cooperates with the continuous tensioning screw to form a complete magnetic yoke.

[0032] To improve the overall integrity of the yoke section, the lower pressure plate 11 and the upper pressure plate 13 are preferably full-ring pressure plates. Air guides are provided on the non-yoke laminations 12 contact surfaces of the upper pressure plate 13 and / or lower pressure plate 11 of the segmented yoke 1. The air guides 2 serve two purposes: firstly, to form ventilation channels between the segmented yokes 1, and secondly, to create installation space for the ends of the tensioning screws between the segmented yokes 1. The height of the air guides 2 is at least twice the height of the tensioning screws extending out of the pressure plate for each segmented yoke. The air guides are located circumferentially in the region directly opposite the magnetic poles and are welded to the upper pressure plate 13 or the lower pressure plate 11. A ventilation channel formed by the air guides exists between axially adjacent segmented yokes 1. The outer side of the yoke laminations 12 is machined with a magnetic pole T-tail keyway 14, and the inner side is machined with a yoke keyway 15.

[0033] like Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, based on a segmented pre-assembled stacked magnetic yoke structure in Embodiment 1, the air guide belt includes air guide plate groups fixed to the contact surfaces of the upper pressure plate 13 and / or lower pressure plate 11 non-magnetic yoke laminations 12 of the segmented magnetic yoke 1. These air guide plate groups are evenly distributed on the circumference, and an air guide belt is formed between two adjacent air guide plate groups.

[0034] The segmented magnetic yoke 1 located at the bottom is the first segmented magnetic yoke segment, and the segmented magnetic yoke 1 located above the first segmented magnetic yoke segment is the upper segmented magnetic yoke segment. Among them, the air guide plate group of the first segmented magnetic yoke segment consists of two air guide plates 2 arranged opposite each other. The two air guide plates 2 converge towards the inner diameter side of the segmented magnetic yoke 1 on one side, and the height of the air guide plates 2 is higher than the height of the small segmented tightening screw 4 extending out of the upper pressure plate 13 and the lower pressure plate 11.

[0035] The first magnetic yoke section protrudes from the non-magnetic yoke punch 12 of the upper pressure plate 13 and / or lower pressure plate 11 to form a boss 3. The boss 3 is positioned opposite the air guide plate assembly and has the same height as the air guide plate assembly.

[0036] The upper section of the magnetic yoke section has an E-shaped air guide plate 2. The air guide plate 2 includes a middle extension section and two side extension sections. The two side extension sections extend from one end of the middle extension section located in the magnetic yoke keyway 15 to the corresponding side.

[0037] The air guide plate 2 extends to the keyway 14 at the tail of the magnetic pole T, thereby covering a large area in the radial direction of the magnetic yoke and reducing the deformation of the suspended section between adjacent magnetic yoke segments.

[0038] like Figures 1-4As shown, this embodiment provides an installation method for a segmented pre-assembled laminated magnetic yoke structure used in the above-described example. The method comprises three parts: a segmented magnetic yoke 1 pre-assembly stage, a segmented magnetic yoke 1 transfer stage, and an on-site installation stage. Existing installation methods involve manual lamination assembly. This embodiment, based on the requirement for automated robotic lamination, requires a dedicated tooling platform within the factory. A simulated rotor support is used instead of the actual rotor support tooling, primarily to provide positioning references and support for the laminated magnetic yokes during the factory pre-assembly stage. The specific segmented magnetic yoke 1 pre-assembly steps are as follows: A1. A simulated rotor support fixture 5 is arranged at the inner circle position of the magnetic yoke lamination 12. The simulated rotor support fixture 5 is equipped with simulated vertical ribs 51 evenly arranged according to the number of vertical ribs 9 of the product's upright rotor support. The circumferential cross-sectional dimensions of the simulated vertical ribs 51 are precisely matched with the dimensions of the keyway on the inner side of the magnetic yoke lamination 12 with a small clearance to ensure the accuracy of the magnetic yoke lamination stacking. The height of the simulated vertical ribs 51 is higher than the height of the magnetic yoke section. The position of the simulated rotor support fixture 5 is adjusted to ensure that the horizontality of the simulated vertical rib hooks meets the installation standards.

[0039] A2. Place the lower pressure plate 11 of the segmented magnetic yoke 1 onto the simulated vertical rib hook.

[0040] A3. Using the simulated vertical rib 51 as the positioning reference, stack the magnetic yoke punch 12 on the lower pressure plate 11. When the magnetic yoke punch 12 is stacked to the designed height, cover the uppermost magnetic yoke punch 12 with the upper pressure plate 13, and tighten the magnetic yoke punch 12, the lower pressure plate 11 and the upper pressure plate 13 with the small section tightening screw 4, thereby completing the pre-assembly of a segmented magnetic yoke 1.

[0041] Repeat steps A1-A3 above to pre-assemble the multi-segmented magnetic yoke 1.

[0042] An embodiment of the rotor support simulation device for small-segment magnetic yoke lamination is as follows: The simulation device consists of a cylinder 52 and simulated vertical ribs 51. The simulated vertical ribs 51 are welded to the arm of the cylinder 52, and the axial cross-sectional dimensions of the simulated vertical ribs 51 are precisely matched with the dimensions of the keyway on the inner side of the magnetic yoke by machining. Each simulated vertical rib 51 has a simulated vertical rib hook at its bottom to support the weight of the annular small-segment magnetic yoke. The simulated vertical rib hooks are precision machined to ensure that the height difference between the planes of each hook is controlled within a certain range, thereby ensuring that the circumferential waviness of the magnetic yoke meets the installation standards during lamination.

[0043] The segmented yoke 1 transfer stage refers to transferring a set number of segmented yokes 1 to the usage site.

[0044] like Figures 4-8 As shown, the on-site installation stage refers to assembling the multi-segment magnetic yoke 1 onto the rotor support at the application site, thus completing the rotor assembly; specifically, it includes the following steps: A4. Adjust the position of the upright rotor bracket to ensure that the horizontality of the upright rib hook meets the installation standards.

[0045] A5. Set up 4 lifting points on the magnetic yoke section, connect the lifting points with two long lifting ropes, and use a single hook lifting method to put the segmented magnetic yoke 1 into the upright rotor bracket, and adjust the concentricity of the first segmented magnetic yoke with the upright rotor bracket.

[0046] A6. After assembling the set number of segmented magnetic yokes 1 onto the upright rotor bracket according to the steps A4-A5 above, the on-site assembly of the magnetic yokes is completed.

[0047] In step A5, the concentricity adjustment of the first segment magnetic yoke and the upright rotor support includes: A51. Insert a pair of short tangential adjustment keys 7 into each of the four tangential keyways spaced 90 degrees apart on the outside of the upright ribs of the upright rotor support to adjust the circumferential position of the yoke. When the circumferential position of the yoke is adjusted to MaxB-MinB≤0.30mm, the yoke and the rotor shaft can be considered to be concentric.

[0048] A52. Drive wedge-shaped adjustment keys 8 into the radial keyways of the vertical ribs 9 on the outside of each upright rotor support. Temporarily spot weld the wedge-shaped adjustment keys 8 to the bottom surface of the vertical ribs. Remove them after all the segmented magnetic yokes 1 are stacked to ensure that the first segmented magnetic yoke remains stationary throughout the entire magnetic yoke installation process. A53. When installing the remaining segmented yokes 1, one of the aforementioned inter-segment fixing tools 6 is arranged in each pole T-tail keyway 14 between adjacent segmented yokes 1 to ensure that each segmented yoke 1 remains concentric until all segments of the yokes are stacked. The inter-segment fixing tool 6 includes an inner groove shim 65, an outer groove shim 63, a cylindrical pin 64, a double-ended stud 61, and a locking nut 62. The inner groove shim 65 is located inside the pole T-tail keyway 14. One end of the double-ended stud 61 is connected to the inner groove shim 65 located inside the pole T-tail keyway 14, and the other end is connected to the outer groove shim 63 located outside the pole T-tail keyway 14. The inner groove shim 65, the outer groove shim 63, and the cylindrical pins 64 located on both sides of the inner groove shim 65 are tightened by the double-ended stud 61 and the locking nut 62.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for installing segmented pre-assembled laminated magnetic yokes, characterized in that, It includes the pre-assembly stage of segmented magnetic yoke (1), the transportation stage of segmented magnetic yoke (1) and the on-site installation stage; The pre-assembly stage of the segmented magnetic yoke (1) includes the following steps: A1. Arrange a simulated rotor support fixture (5) at the inner circle position of the magnetic yoke lamination (12). The simulated rotor support fixture (5) is evenly arranged with simulated vertical ribs (51) according to the number of vertical ribs (9) of the main rotor support. The circumferential cross-sectional dimensions of the simulated vertical ribs (51) match the magnetic yoke keyway (15) on the inner side of the magnetic yoke lamination (12). Adjust the position of the simulated rotor support fixture (5) to ensure that the horizontality of the simulated vertical rib hook meets the installation standard. A2. Place the lower pressure plate (11) of the segmented magnetic yoke (1) onto the simulated vertical rib hook; A3. Using the simulated vertical rib (51) as the positioning reference, stack the magnetic yoke punch (12) on the lower pressure plate (11). When the magnetic yoke punch (12) is stacked to the design height, cover the uppermost magnetic yoke punch (12) with the upper pressure plate (13), and tighten the magnetic yoke punch (12), lower pressure plate (11) and upper pressure plate (13) with the small section tightening screw (4) and the small section tightening nut (3) to complete the pre-assembly of a segmented magnetic yoke (1). Repeat steps A1-A3 above to pre-assemble the multi-segmented magnetic yoke (1); The segmented magnetic yoke (1) transfer stage refers to transferring a set number of segmented magnetic yokes (1) to the usage site; The on-site installation stage refers to assembling the multi-segmented magnetic yoke (1) on the rotor bracket at the site of use to complete the rotor assembly; specifically, it includes the following steps: A4, adjust the position of the rotor bracket to ensure that the horizontality of the upright hook meets the installation standard; A5. Fit the segmented magnetic yoke (1) into the upright rotor bracket and adjust the first segmented magnetic yoke to be concentric with the upright rotor bracket. A6. After assembling the set number of segmented magnetic yokes (1) onto the upright rotor support according to the above steps A4-A5, the on-site assembly of the magnetic yokes is completed.

2. The segmented pre-assembled stacked magnetic yoke installation method according to claim 1, characterized in that, In step A5, the concentricity adjustment of the first segment magnetic yoke and the upright rotor support includes: A51. Insert a pair of short tangential adjustment keys (7) into the four vertical ribs at 90-degree intervals on the outside of the upright ribs (9) of the upright rotor support to adjust the circumferential position of the yoke. A52. Drive wedge-shaped adjustment keys (8) into the radial keyways of the vertical ribs (9) on the outside of each upright rotor support. Temporarily spot weld the wedge-shaped adjustment keys (8) to the bottom surface of the upright rotor support vertical ribs (9). Remove them after all the segmented magnetic yokes (1) are stacked to ensure that the first segmented magnetic yoke remains stationary throughout the entire magnetic yoke installation process. A53. When installing the remaining segmented magnetic yokes (1), use the inter-segment fixing tool (6) to connect the magnetic pole T tail keyway (14) of the upper and lower adjacent segmented magnetic yokes (1) to ensure that each segmented magnetic yoke (1) remains concentric until each segmented magnetic yoke is stacked.

3. The segmented pre-assembled stacked magnetic yoke installation method according to claim 2, characterized in that, Adjust the circumferential position of the magnetic yoke until MaxB-MinB≤0.30mm.

4. A stacked magnetic yoke structure installed using the segmented pre-assembled stacked magnetic yoke installation method according to any one of claims 1-3, characterized in that, The yoke includes a segmented magnetic yoke (1), which comprises a lower pressure plate (11), magnetic yoke laminations (12), an upper pressure plate (13), a small-segment tightening screw (4), and a small-segment tightening nut (3). The small-segment tightening screw (4) and the small-segment tightening nut (3) are used to press several axially stacked magnetic yoke laminations (12) together to form the segmented magnetic yoke (1). The non-magnetic yoke laminations (12) of the upper pressure plate (13) and / or the lower pressure plate (11) of the segmented magnetic yoke (1) are in contact with each other. A guide belt is provided on the surface, and the guide belt is directly facing the magnetic pole area; several segmented magnetic yokes (1) are stacked axially, and each segmented magnetic yoke (1) is tightened by a through-length tensioning screw passing through each segmented magnetic yoke (1) and a nut cooperating with the through-length tensioning screw to form a complete magnetic yoke. There is a ventilation groove formed by the guide belt between axially adjacent segmented magnetic yokes (1). The outer side of the magnetic yoke punch (12) is machined with a magnetic pole T-tail keyway (14), and the inner side is machined with a magnetic yoke keyway (15).

5. The stacked magnetic yoke structure according to claim 4, characterized in that, Several air guide plate groups are provided on the non-magnetic yoke punch (12) contact surface of the upper pressure plate (13) and / or lower pressure plate (11). The air guide plate groups are evenly distributed along the circumference, and the air guide belt is formed between two adjacent air guide plate groups.

6. The stacked magnetic yoke structure according to claim 5, characterized in that, The air guide plate group of the segmented magnetic yoke (1) consists of two air guide plates (2) arranged opposite to each other. The two air guide plates (2) converge on one side towards the inner diameter of the segmented magnetic yoke (1). The height of the air guide plate (2) is higher than the height of the small section tightening screw (4) extending out of the upper pressure plate (13) and the lower pressure plate (11).

7. The stacked magnetic yoke structure according to claim 6, characterized in that, The segmented magnetic yoke (1) has an E-shaped air guide plate (2). The air guide plate (2) includes a middle extension section and two side extension sections. The two side extension sections extend from one end of the middle extension section located at the magnetic yoke keyway (15) to the corresponding side to the magnetic pole T tail keyway (14).

8. The stacked magnetic yoke structure according to claim 6 or 7, characterized in that, The segmented magnetic yoke (1) is equipped with an inter-segment fixing tool (6). The inter-segment fixing tool (6) includes an inner groove pad (65), an outer groove pad (63), a cylindrical pin (64), a double-ended stud (61), and a locking nut (62). The inner groove pad (65) is located in the keyway of the magnetic pole T (14). One end of the double-ended stud (61) is connected to the inner groove pad (65) located in the keyway of the magnetic pole T (14), and the other end is connected to the outer groove pad (63) located outside the keyway of the magnetic pole T (14). The inner groove pad (65), the outer groove pad (63), and the cylindrical pin (64) located on both sides of the inner groove pad (65) are tightened by the double-ended stud (61) and the locking nut (62).

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