A large diameter direct drive permanent magnet synchronous double lock buckle and its assembly method

Abstract

The present invention discloses a large-diameter direct-drive permanent magnet synchronous double lock and an assembly method thereof, comprising a rotor hub, a plurality of punching sheet magnetic isolation fixing blocks are sequentially wound around the periphery of the rotor hub, a slot is formed between the tops of two adjacent punching sheet magnetic isolation fixing blocks, a punching sheet is correspondingly arranged in the slot, a placement slot is formed between two adjacent punching sheets, and a magnetic steel is correspondingly arranged in the placement slot. The present invention splits the iron core of the original integrated rotor punching sheet into a single-tooth structure, which is divided into a punching sheet and a punching sheet magnetic isolation fixing block, and the punching sheet and the punching sheet magnetic isolation fixing block are distributed and installed separately, which is convenient for installation and greatly reduces the difficulty of process operation.

Description

Technical Field

[0001] The invention relates to a large-diameter direct-drive permanent-magnet synchronous double lock buckle and an assembling method thereof. Background Art

[0002] At present, the design and processing of the rotor tooth magnetic circuit of large-diameter direct-drive permanent magnet synchronous motors has serious leakage flux and the pain point of using a large amount of precious permanent magnets, which has always been faced with design and process constraints; the magnetic circuit has good magnetic isolation and uses a small amount of permanent magnets, but the process is difficult to operate and is labor-intensive and time-consuming; while the process is easy to process, the leakage flux is sacrificed, the leakage flux loss is large, the amount of permanent magnets used increases, and the material cost and manufacturing cost are increased.

[0003] Therefore, it is necessary to provide a large-diameter direct-drive permanent magnet synchronous double lock buckle and an assembly method thereof to solve the above-mentioned problems of difficult process operation, labor-consuming and time-consuming, and large magnetic leakage loss. Summary of the invention

[0004] In view of this, the present invention provides a large-diameter direct-drive permanent-magnet synchronous double lock buckle and an assembly method thereof. The purpose is to provide a large-diameter direct-drive permanent-magnet synchronous double lock buckle and an assembly method thereof with simple process, time-saving, labor-saving and cost-saving.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A large-diameter direct-drive permanent magnet synchronous double lock comprises a rotor hub, and a plurality of punching magnetic isolation fixing blocks are arranged in sequence around the periphery of the rotor hub, and limit grooves and limit blocks are arranged on the left and right sides of the punching magnetic isolation fixing blocks respectively, and the two adjacent punching magnetic isolation fixing blocks are connected by the corresponding engagement and limiting connection of the limit grooves and the limit blocks, and the plurality of punching magnetic isolation fixing blocks form a magnetic isolation ring structure, and the bottom of the connection between the two adjacent punching magnetic isolation fixing blocks is connected and positioned with the outer edge of the rotor hub by a metal key, and the middle parts of the plurality of punching magnetic isolation fixing blocks are connected with the outer edge of the rotor hub by the corresponding cooperation between the hexagon socket bolt, the first threaded hole and the second threaded hole, and a slot is formed between the tops of the two adjacent punching magnetic isolation fixing blocks, and punching sheets are arranged in the slot, and a placement groove is formed between the two adjacent punching sheets, and magnetic steel is arranged in the placement groove.

[0007] Preferably, the first threaded hole is formed through the central portion of the punching sheet magnetic isolation fixing block along the radial direction of the rotor hub, and the second threaded hole is formed on the outer edge of the rotor hub corresponding to the first threaded hole.

[0008] Preferably, an outer metal keyway is provided at the bottom of the connection between two adjacent punching sheet magnetic isolation fixing blocks corresponding to the outer half of the periphery of the metal key, and an inner metal keyway is provided on the outer edge of the rotor hub corresponding to the outer metal keyway.

[0009] Preferably, diamond-shaped grooves are correspondingly provided on the punching sheets.

[0010] Preferably, the punching sheet magnetic isolation fixing block is made of non-magnetic material.

[0011] The present invention also proposes an assembly method for a large-diameter direct-drive permanent magnet synchronous double lock buckle. Based on the above-mentioned large-diameter direct-drive permanent magnet synchronous double lock buckle, the assembly method includes the following steps:

[0012] Step 1: Through the corresponding threaded connections between the multiple groups of first threaded holes, the hexagon socket bolts and the second threaded holes, the multiple punching sheet magnetic isolation fixing blocks are respectively and sequentially connected and fixed to the periphery of the rotor hub, wherein the positioning of two adjacent punching sheet magnetic isolation fixing blocks is limited by the limiting groove and the limiting block;

[0013] Step 2: placing a plurality of metal keys into a plurality of metal key slots formed between the bottom of two adjacent punching plate magnetic isolation fixing blocks and the top of the outer periphery of the rotor hub;

[0014] Step 3: inserting the plurality of punching sheets into the plurality of slots formed between the magnetic isolation fixing blocks of the plurality of adjacent two punching sheets;

[0015] Step 4: After multiple punching sheets are installed, magnets are inserted into multiple placement grooves formed between multiple groups of adjacent punching sheets along the axial direction of the rotor hub. The installed magnets are clamped and fastened by the end faces on the opposite sides of two adjacent punching sheets.

[0016] The beneficial effects of the present invention are:

[0017] 1. The present invention includes a rotor hub, and a plurality of punching sheet magnetic isolation fixing blocks are correspondingly arranged around the periphery of the rotor hub in sequence. The bottom of the connection between two adjacent punching sheet magnetic isolation fixing blocks is connected and positioned with the outer edge of the rotor hub by a metal key. The middle parts of the plurality of punching sheet magnetic isolation fixing blocks are connected with the outer edge of the rotor hub by hexagon socket bolts. A slot is correspondingly formed between the tops of the two adjacent punching sheet magnetic isolation fixing blocks, and punching sheets are correspondingly arranged in the slot. A placement groove is correspondingly formed between the two adjacent punching sheets, and magnetic steel is correspondingly arranged in the placement groove. This arrangement splits the iron core of the original integrated rotor punching sheet into a single-tooth structure, which is divided into a punching sheet and a punching sheet magnetic isolation fixing block. The plurality of punching sheet magnetic isolation fixing blocks are respectively connected and fixed around the periphery of the rotor hub by hexagon socket bolts in sequence, and then A metal key is placed in a metal keyway formed by the bottom of two adjacent punching sheet magnetic isolation fixing blocks and the top of the rotor hub periphery, and then multiple punching sheets are correspondingly inserted into the card slots formed between multiple groups of adjacent punching sheet magnetic isolation fixing blocks. After the installation of multiple punching sheets is completed, magnetic steel is inserted into multiple placement slots formed between multiple groups of adjacent punching sheets along the axial direction of the rotor hub. Compared with the traditional large-diameter direct-drive permanent magnet synchronous double lock buckle, this large-diameter direct-drive permanent magnet synchronous double lock buckle adopts a single-tooth structure and distributed installation. It is easy to install and greatly reduces the difficulty of process operation, reduces labor consumption, saves time and effort, and can save the use of precious permanent magnets. While saving energy, it can also greatly save material costs and manufacturing costs, which is conducive to improving production efficiency.

[0018] 2. The left and right sides of the punching sheet magnetic isolation fixing block of the present invention are respectively provided with limiting grooves and limiting blocks. The two adjacent punching sheet magnetic isolation fixing blocks are connected by corresponding engaging and limiting connections between the limiting grooves and the limiting blocks. This arrangement facilitates the rapid positioning and installation between the two adjacent punching sheet magnetic isolation fixing blocks through the engaging positioning between the limiting grooves and the limiting blocks. While facilitating the installation, it also greatly reduces the operating difficulty of the process, reduces labor consumption, saves time and effort, and is conducive to improving production efficiency.

[0019] 3. In the present invention, an outer metal keyway is arranged on the periphery of the outer half side (the half side away from the center of the rotor hub) of the metal key corresponding to the bottom of the connection between the two adjacent punching magnetic isolation fixing blocks, and an inner metal keyway is arranged on the outer edge of the rotor hub corresponding to the outer metal keyway. The outer metal keyway and the inner metal keyway together form a metal keyway for placing the metal key. This arrangement ensures that the magnetic isolation ring structure formed by the multiple punching magnetic isolation fixing blocks is accurately aligned with the periphery of the rotor hub by tightly fitting the metal key and the metal keyway, which can reduce vibration and wear during operation, and can withstand large shear force and transmit torque, is not easy to loosen, and has a high connection reliability. Compared with welding and other connection methods, the magnetic isolation ring structure formed by the multiple punching magnetic isolation fixing blocks and the periphery of the rotor hub are easier to disassemble and assemble. While the disassembly and assembly are convenient, the operation difficulty of the process is greatly reduced, the labor consumption is reduced, and it is more time-saving and labor-saving, which is conducive to improving production efficiency, and the maintenance and repair costs are lower, which is more economical and practical.

[0020] 4. A first threaded hole is formed in the central portion of the punching magnetic isolation fixing block along the radial direction of the rotor hub, and a second threaded hole is formed on the outer edge of the rotor hub corresponding to the first threaded hole. This arrangement is achieved by correspondingly matching the hexagon socket bolt, the first threaded hole and the second threaded hole through threaded connections. Since there is a large contact area between the outer wall of the hexagon socket bolt and the first threaded hole and the second threaded hole, the hexagon socket bolt can withstand a larger torque when tightened, thereby further stabilizing the connection between the magnetic isolation ring structure formed by the multiple punching magnetic isolation fixing blocks and the periphery of the rotor hub. The entire installation process only requires the use of a special hexagon socket wrench to complete the installation, without the need for special skills or complex equipment, making it easier to disassemble and assemble the magnetic isolation ring structure formed by the multiple punching magnetic isolation fixing blocks and the periphery of the rotor hub. While facilitating disassembly and assembly, it also greatly reduces the operating difficulty of the process, reduces labor consumption, saves time and effort, and is conducive to improving production efficiency.

[0021] 5. The punching sheets of the present invention are provided with corresponding diamond grooves, which are magnetic circuit design structures. Compared with the traditional straight groove design, this setting can enhance the strength of the rotor punching core and more evenly distribute the magnetic flux density to reduce local magnetic saturation. It can effectively guide the flow of magnetic lines, increase the effective magnetic track path, and reduce magnetic leakage, thereby improving the overall magnetic circuit utilization and energy conversion efficiency.

[0022] 6. The punching sheet magnetic isolation fixing block of the present invention is made of non-magnetic material. A magnetic isolation ring structure is formed by a plurality of punching sheet magnetic isolation fixing blocks made of non-magnetic material, thereby enhancing the insulation between the rotor hub and the punching sheets, magnetic steel and other components, and can effectively block the eddy currents generated by the alternating magnetic field in the rotor core, which is beneficial to improving energy utilization. At the same time, this magnetic isolation ring structure can optimize the magnetic flux path, reduce magnetic resistance and leakage magnetic flux, and improve the utilization efficiency of the magnetic circuit, so that the output torque of the rotor is more stable and the response speed is faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front view structural schematic diagram of the present invention;

[0024] Figure 2 It is a partial front view structural schematic diagram of the present invention;

[0025] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of part A;

[0026] Figure 4 It is an assembly flow chart of the present invention.

[0027] Figure markings: 1: rotor hub, 2: punching sheet magnetic isolation fixing block, 3: metal key, 4: hexagon socket bolt, 5: slot, 6: punching sheet, 7: placement slot, 8: magnet, 9: limit slot, 10: limit block, 11: outer metal keyway, 12: inner metal keyway, 13: first threaded hole, 14: second threaded hole, 15: diamond slot. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, it includes a rotor hub 1, and a plurality of punching magnetic isolation fixing blocks 2 are sequentially wound around the periphery of the rotor hub 1. The bottom of the connection between two adjacent punching magnetic isolation fixing blocks 2 is connected and positioned with the outer edge of the rotor hub 1 through a metal key 3. The middle parts of the plurality of punching magnetic isolation fixing blocks 2 are connected to the outer edge of the rotor hub 1 through a hexagon socket bolt 4. A slot 5 is correspondingly formed between the tops of two adjacent punching magnetic isolation fixing blocks 2, and a punching sheet 6 is correspondingly arranged in the slot 5. A placement groove 7 is correspondingly formed between two adjacent punching sheets 6, and a magnetic steel 8 is correspondingly arranged in the placement groove 7. This arrangement splits the iron core of the original integrated rotor punching sheet 6 into a single-tooth structure, which is divided into a punching sheet 6 and a punching magnetic isolation fixing block 2, and the plurality of punching magnetic isolation fixing blocks 2 are sequentially connected and fixed to the periphery of the rotor hub 1 through the hexagon socket bolts 4. The metal key 3 is then placed into the metal key 3 groove formed by the bottom of the two adjacent punching magnetic isolation fixing blocks 2 and the top of the outer periphery of the rotor hub 1, and then multiple punching sheets 6 are correspondingly inserted into the card slots 5 formed between multiple groups of adjacent two punching magnetic isolation fixing blocks 2. After the installation of multiple punching sheets 6 is completed, the magnetic steel 8 is correspondingly inserted into the multiple placement slots 7 formed between multiple groups of adjacent two punching sheets 6 along the axial direction of the rotor hub 1. Compared with the traditional large-diameter direct-drive permanent magnet synchronous double lock buckle, this large-diameter direct-drive permanent magnet synchronous double lock buckle adopts a single-tooth structure and distributed installation. It is easy to install and greatly reduces the difficulty of process operation, reduces labor consumption, saves time and effort, and can save the use of precious permanent magnets. While saving energy, it can also greatly save material costs and manufacturing costs, which is conducive to improving production efficiency.

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, limiting grooves 9 and limiting blocks 10 are respectively provided on the left and right sides of the punching sheet magnetic isolation fixing block 2, and the two adjacent punching sheet magnetic isolation fixing blocks 2 are connected by corresponding engaging and limiting connections through the limiting grooves 9 and the limiting blocks 10. This setting facilitates the rapid positioning and installation between the two adjacent punching sheet magnetic isolation fixing blocks 2 through the engaging positioning between the limiting grooves 9 and the limiting blocks 10. While facilitating the installation, it also greatly reduces the operating difficulty of the process, reduces labor consumption, saves time and effort, and is conducive to improving production efficiency.

[0033] like Figure 1 , Figure 2 and Figure 3 As shown, an outer metal keyway 11 is provided on the periphery of the outer half of the metal key 3 (the half away from the center of the rotor hub 1) corresponding to the bottom of the connection between the two adjacent punching magnetic isolation fixing blocks 2, and an inner metal keyway 12 is provided on the outer edge of the rotor hub 1 corresponding to the outer metal keyway 11. The outer metal keyway 11 and the inner metal keyway 12 together form a metal keyway for placing the metal key 3. This setting ensures that the magnetic isolation ring structure formed by the multiple punching magnetic isolation fixing blocks 2 is accurately aligned with the periphery of the rotor hub 1 by tightly fitting the metal key 3 with the metal keyway, which can reduce vibration and wear during operation, and can withstand large shear force and transmit torque, is not easy to loosen, and has a high connection reliability; compared with welding and other connection methods, the magnetic isolation ring structure formed by the multiple punching magnetic isolation fixing blocks 2 and the periphery of the rotor hub 1 is easier to disassemble and assemble, and while the disassembly and assembly are convenient, the operation difficulty of the process is greatly reduced, the labor consumption is reduced, and it is more time-saving and labor-saving, which is conducive to improving production efficiency, and the maintenance and repair costs are lower, which is more economical and practical.

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, a first threaded hole 13 is formed through the central portion of the punching magnetic isolation fixing block 2 in the radial direction of the rotor hub 1, and a second threaded hole 14 is formed on the outer edge of the rotor hub 1 corresponding to the first threaded hole 13. This arrangement is achieved by correspondingly matching the hexagon socket bolt 4, the first threaded hole 13 and the second threaded hole 14 through threaded connections. Since the outer wall of the hexagon socket bolt 4 has a larger contact area with the first threaded hole 13 and the second threaded hole 14, the hexagon socket bolt 4 can withstand a larger torque when tightened, thereby further stabilizing the connection between the magnetic isolation ring structure formed by the multiple punching magnetic isolation fixing blocks 2 and the periphery of the rotor hub 1. The entire installation process only requires the use of a special hexagon socket wrench to complete the installation, without the need for special skills or complex equipment, making it easier to disassemble and assemble the magnetic isolation ring structure formed by the multiple punching magnetic isolation fixing blocks 2 and the periphery of the rotor hub 1. While facilitating disassembly and assembly, it also greatly reduces the difficulty of the process operation, reduces labor consumption, saves time and effort, and is conducive to improving production efficiency.

[0035] like Figure 1 , Figure 2 and Figure 3As shown, a diamond groove 15 is correspondingly opened on the punching sheet 6. The diamond groove 15 is a magnetic circuit design structure. Compared with the traditional straight groove design, this setting can enhance the strength of the rotor punching core and can more evenly distribute the magnetic flux density to reduce local magnetic saturation. It can effectively guide the flow of magnetic lines, increase the effective magnetic track path, and reduce magnetic leakage, thereby improving the overall magnetic circuit utilization and energy conversion efficiency.

[0036] like Figure 1 , Figure 2 and Figure 3 As shown, the punching sheet magnetic isolation fixing block 2 is made of non-magnetic material. A magnetic isolation ring structure is formed by a plurality of punching sheet magnetic isolation fixing blocks 2 made of non-magnetic material, thereby enhancing the insulation between the rotor hub 1 and components such as the punching sheet 6 and the magnetic steel 8, and can effectively block the eddy current generated by the alternating magnetic field in the rotor core, which is beneficial to improving the energy utilization rate. At the same time, this magnetic isolation ring structure can optimize the magnetic flux path, reduce magnetic resistance and leakage magnetic flux, and improve the utilization efficiency of the magnetic circuit, so that the output torque of the rotor is more stable and the response speed is faster.

[0037] This embodiment provides a large-diameter direct-drive permanent magnet synchronous double lock buckle and an assembly method thereof, and the specific assembly steps are as follows:

[0038] Step 1: Through the corresponding threaded connections between the multiple groups of first threaded holes 13, the hexagon socket bolts 4 and the second threaded holes 14, the multiple punching magnetic isolation fixing blocks 2 are respectively connected and fixed to the periphery of the rotor hub 1 in sequence, wherein the positioning of two adjacent punching magnetic isolation fixing blocks 2 is limited by the limiting groove 9 and the limiting block 10;

[0039] Step 2: placing a plurality of metal keys 3 into a plurality of metal key slots formed between the bottom of two adjacent punching magnetic isolation fixing blocks 2 and the top of the outer periphery of the rotor hub 1;

[0040] Step 3: inserting a plurality of punching sheets 6 into a plurality of slots 5 formed between a plurality of adjacent two punching sheet magnetic isolation fixing blocks 2;

[0041] Step 4: After the installation of multiple punching sheets 6 is completed, the magnets 8 are correspondingly inserted into the multiple placement grooves 7 formed between multiple groups of adjacent punching sheets 6 along the axial direction of the rotor hub 1. The installed magnets 8 are clamped and fastened by the end faces on the opposite sides of the two adjacent punching sheets 6.

[0042] The specific operating principle is:

[0043] Step 1: Through corresponding threaded connections between multiple groups of first threaded holes, hexagon socket bolts and second threaded holes, multiple punching sheet magnetic isolation fixing blocks are sequentially connected and fixed to the periphery of the rotor hub, wherein two adjacent punching sheet magnetic isolation fixing blocks are positioned by limiting grooves and limiting blocks;

[0044] Step 2: placing a plurality of metal keys into a plurality of metal key slots formed by the bottom of two adjacent punching magnetic isolation fixing blocks and the top of the outer periphery of the rotor hub;

[0045] Step 3: insert the plurality of punching sheets into the plurality of slots formed between the plurality of adjacent two punching sheet magnetic isolation fixing blocks;

[0046] Step 4: After multiple punching sheets are installed, magnets are inserted into multiple placement grooves formed between multiple groups of adjacent punching sheets along the axial direction of the rotor hub. The installed magnets are clamped and fastened by the end faces on the opposite sides of two adjacent punching sheets.

[0047] The components provided by the present invention are only used for the purpose of this technical solution according to the structural characteristics of the product. The product will be adjusted and modified after purchase to make it more matching and conforming to the technical solution of the present invention. It is a technical solution for the best application of this technical solution. The model of the product can be replaced and modified according to the required technical parameters, which is well known to the technical personnel in this field. Therefore, the technical personnel in this field can clearly obtain the corresponding use effect through the technical solution provided by the present invention.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. Large diameter direct drive permanent magnet synchronous double lock, characterized by: It includes a rotor hub, and a plurality of punching magnetic isolation fixing blocks are arranged in sequence around the periphery of the rotor hub. Limiting grooves and limiting blocks are respectively arranged on the left and right sides of the punching magnetic isolation fixing blocks. Two adjacent punching magnetic isolation fixing blocks are connected by corresponding engagement and limiting connection of the limiting grooves and the limiting blocks. A plurality of punching magnetic isolation fixing blocks form a magnetic isolation ring structure. The bottom of the connection between two adjacent punching magnetic isolation fixing blocks is connected and positioned with the outer edge of the rotor hub by a metal key. The middle parts of the plurality of punching magnetic isolation fixing blocks are connected to the outer edge of the rotor hub by corresponding cooperation between the hexagon socket bolt, the first threaded hole and the second threaded hole. A slot is correspondingly formed between the tops of two adjacent punching magnetic isolation fixing blocks, and punching sheets are correspondingly arranged in the slot. A placement groove is correspondingly formed between two adjacent punching sheets, and magnetic steel is correspondingly arranged in the placement groove.

2. The large-diameter direct-drive permanent magnet synchronous double lock according to claim 1, characterized in that: The first threaded hole is formed through the central portion of the punching magnetic isolation fixing block along the radial direction of the rotor hub, and the second threaded hole is formed on the outer edge of the rotor hub corresponding to the first threaded hole.

3. The large-diameter direct-drive permanent magnet synchronous double lock according to claim 1, characterized in that: An outer metal keyway is arranged at the bottom of the connection between two adjacent punching magnetic isolation fixing blocks, corresponding to the outer half of the metal key, and an inner metal keyway is arranged on the outer edge of the rotor hub, corresponding to the outer metal keyway.

4. The large-diameter direct-drive permanent magnet synchronous double lock according to claim 1, characterized in that: The punching sheet is provided with a corresponding rhombus groove.

5. The large diameter direct drive permanent magnet synchronous double lock buckle according to claim 1, characterized in that: The punching sheet magnetic isolation fixing block is made of non-magnetic conductive material.

6. An assembly method based on the large-diameter direct-drive permanent magnet synchronous double lock buckle according to any one of claims 1-2, characterized in that: The following steps are involved: Step 1: Through corresponding threaded connections among a plurality of groups of the first threaded holes, the hexagon socket bolts and the second threaded holes, a plurality of the punching sheet magnetic isolation fixing blocks are respectively and sequentially connected and fixed to the periphery of the rotor hub, wherein two adjacent punching sheet magnetic isolation fixing blocks are positioned by the limiting groove and the limiting block; Step 2: placing a plurality of the metal keys into a plurality of metal key slots formed by the bottom of two adjacent punching magnetic isolation fixing blocks and the top of the outer periphery of the rotor hub; Step 3: inserting the plurality of punching sheets into the plurality of slots formed between a plurality of adjacent two punching sheet magnetic isolation fixing blocks; Step 4: After the installation of the plurality of punching sheets is completed, the magnets are respectively inserted into the plurality of placement grooves formed between the plurality of adjacent punching sheets along the axial direction of the rotor hub. The installed magnets are clamped and fastened by the end faces on the opposite sides of the two adjacent punching sheets.

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