A magnetic suspension motor rotor assembly method and tooling

Abstract

The present invention relates to the field of magnetic suspension motor rotors, and in particular to a magnetic suspension motor rotor assembly method and tooling. The method comprises: assembling a magnetic isolation ring and magnetic steel, assembling a front spindle and a rear spindle, cutting a motor shaft, assembling a magnetic steel sheath and heat-shrinking the remaining motor rotor parts and cutting to the final size; the method assembles the magnetic isolation ring and magnetic steel assembly, the front spindle and the rear spindle in a vertical direction, and different parts support each other in the vertical direction without the need for a supporting device, so as to reduce the number of positioning devices; at the same time, each part is coaxially adjusted in the horizontal direction without the need to overcome the gravity of the parts, thereby reducing the labor intensity of workers.

Description

Technical Field

[0001] The present invention relates to the field of magnetic levitation motor rotors, and in particular to a magnetic levitation motor rotor assembly method and tooling. Background Art

[0002] With the advancement of science and technology and the demands of production, magnetically levitated high-speed motors have become a hot topic of research in the international electrical engineering field. Due to their advantages such as high energy density, compact size, and high efficiency, magnetically levitated high-speed motors are currently widely used in industrial fields such as micro gas turbines, high-speed centrifugal compressors, molecular pumps, high-speed machining centers, and flywheel energy storage, and their application range continues to expand. During the operation of a magnetically levitated motor, the stability of the motor rotor is crucial to ensuring smooth and efficient operation. The magnetic properties of the motor's permanent magnets and the dynamic balance of the rotor itself directly affect the performance of the magnetically levitated motor.

[0003] A Chinese invention patent application (publication number CN108988534B, publication date June 19, 2020) discloses a high-speed permanent magnet motor rotor and a machining method thereof. The rotor comprises a rotating shaft comprising, from left to right, a first shaft, a second shaft, and a third shaft. The first and third shafts are heat-coated and tightly fitted with a magnetic bearing sensor rotor assembly, magnetic bearing sensor rotor silicon steel sheets, a magnetic bearing rotor assembly, and magnetic bearing rotor silicon steel sheets. The second shaft is sheathed with a rotor core, the outer periphery of which is provided with surface-mounted permanent magnets, each coated with a carbon fiber sheath. The rotor of the present invention boasts a compact and reliable overall structure, strong resistance to radial tension and tangential stress, effective protection for the permanent magnets within the permanent magnet motor, and excellent heat dissipation. The machining method of the present invention, through the close coordination of various steps, enables efficient and effective machining of high-quality high-speed permanent magnet motor rotors.

[0004] The existing technology has the following deficiencies: the magnetic isolation ring and magnetic steel assembly, the front spindle and the rear spindle are placed horizontally on the supporting device, and each part is adjusted in the vertical direction so that the three are coaxially positioned; in this method, additional supporting devices are needed to support the three parts to overcome their own gravity, which increases the number of positioning devices; at the same time, when the coaxial adjustment of each part is performed, the parts need to be moved in the vertical direction, which also increases the labor intensity of the workers when the weight of the parts is heavy. Summary of the Invention

[0005] The purpose of the present invention is: to address the above-mentioned problems, it is proposed to assemble the magnetic isolation ring and magnetic steel assembly, the front main shaft and the rear main shaft in the vertical direction, and the different parts support each other in the vertical direction without the need for supporting devices, so as to reduce the number of positioning devices; at the same time, each part is coaxially adjusted in the horizontal direction without overcoming the gravity of the parts, thereby reducing the labor intensity of workers and providing a magnetic levitation motor rotor assembly method and tooling.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] A method for assembling a magnetic levitation motor rotor, the magnetic levitation motor rotor comprising a motor shaft, a fixed sleeve on the motor shaft being provided with a magnetic steel sleeve, a front shrink sleeve assembly, a thrust plate, and a rear shrink sleeve assembly; the motor shaft comprising a magnetic steel, a magnetic isolation ring, a front spindle, a rear spindle, a positioning step, and an upper positioning surface; the tooling used in the method comprising a magnetic steel assembly tooling, a motor shaft positioning tooling, and a sleeve tooling; the method comprising the following steps:

[0008] (S1) Assembling the magnetic isolation rings and magnetic steels: Apply a set amount of metal adhesive to both end surfaces of the multiple magnetic steels and the inner end surfaces of the two magnetic isolation rings; after the application is completed, the magnetic isolation rings and magnetic steels are placed close together in the magnetic steel assembly tool in the installation order, and the magnetic steel assembly tool presses them tightly and leaves them to stand, waiting for the metal adhesive to take effect;

[0009] (S2) Assembling the front spindle and the rear spindle: Apply metal adhesive to both ends of the magnetic isolation ring and the magnetic steel assembly; Place the rear spindle vertically on the workbench, place the magnetic isolation ring and the magnetic steel assembly on the inner side of the rear spindle, and make the lower end surface of the magnetic isolation ring and the magnetic steel assembly fit with the inner side of the rear spindle; Use the positioning fixture of the motor shaft to adjust the magnetic isolation ring and the magnetic steel assembly in the horizontal direction to be coaxial with the rear spindle and lock them together, and then use the same operation to install the front spindle to the upper end surface of the magnetic isolation ring and the magnetic steel assembly, and let it stand for the metal adhesive to take effect;

[0010] (S3) Cutting the motor shaft: remove the positioning fixture of the motor shaft, and process the positioning step and upper positioning surface of the motor shaft formed by the previous step of bonding;

[0011] (S4) Assembling the magnetic steel sleeve: heat-shrink-fit the magnetic steel sleeve onto the outer wall of the motor shaft, at which point the lower end face of the magnetic steel sleeve is in contact with one end face of the positioning step, and the upper end face of the magnetic steel sleeve is higher than the upper positioning face; placing the sleeve tooling on the outer wall of the front spindle, with the bottom face of the sleeve tooling in contact with the upper end face of the magnetic steel sleeve, and pressing the upper end face of the sleeve tooling with a hydraulic press; after the motor shaft and magnetic steel sleeve assembly cool, remove the sleeve tooling, and cut the upper end face of the magnetic steel sleeve to be flush with the upper positioning face;

[0012] (S5) Shrink-fitting the remaining parts of the motor rotor and cutting them to the final size: The front shrink-fit assembly, the thrust plate, and the rear shrink-fit assembly are shrink-fitted to the outer wall of the motor shaft respectively, and then cut to reach the final design size. Then, the parts that need to be magnetized are magnetized to complete the assembly process of the magnetic levitation motor rotor.

[0013] Preferably, first wipe the two magnetic isolation rings and the end faces of multiple magnetic steels with alcohol, and then apply metal adhesive after the alcohol evaporates; first wipe the magnetic isolation ring and magnetic steel assembly, the inner side of the front spindle and the inner side of the rear spindle with alcohol, and then apply metal adhesive after the alcohol evaporates.

[0014] Preferably, after the magnetic isolation rings and magnets are placed closely together on the magnet assembly tooling, each magnetic isolation ring and magnet is rotated 360°; after the magnetic isolation ring and magnet assembly is placed vertically on the inner side surface of the rear spindle, the magnetic isolation ring and magnet assembly is rotated 360°; after the front spindle is placed vertically on the magnetic isolation ring and magnet assembly, the front spindle is rotated 360°.

[0015] Preferably, the magnet assembly tooling includes a magnet base, a tightening screw and a tightening block; the magnet base is provided with a positioning groove, a positioning side and a screw hole, the positioning groove is a V-shaped groove, and the two side surfaces of the V-shaped groove are respectively in contact with the outer surfaces of multiple magnets and multiple magnetic isolation rings; the positioning side is in contact with the outer end face of one of the magnetic isolation rings; one end of the tightening screw passes through the screw hole and is screwed into the corresponding screw hole, and the tightening block is fixedly arranged at one end of the tightening screw, and the outer end face of the tightening block is in contact with the outer end face of another magnetic isolation ring.

[0016] Preferably, when the magnetic steel assembly tool assembles the magnetic isolation ring and the magnet, the magnetic isolation ring and the magnet are placed tightly in the positioning groove; then the tightening screw is turned to drive the clamping block forward to press the magnetic isolation ring and the magnet assembly.

[0017] Preferably, the positioning fixture of the motor shaft includes multiple positioning blocks and clamps; the positioning block includes a positioning block body and a positioning protrusion, the positioning block body is in the shape of an arc, and the two positioning protrusions are located on the inner side of the arc of the positioning block body; the positioning protrusion is provided with a positioning surface, and the inscribed circle diameter of the positioning surfaces of the two positioning protrusions is the same as the diameter of the magnet; the positioning surface is used to fit with the outer surface of the front main shaft or the rear main shaft at one axial end, and is used to fit with the outer surface of the magnet or the magnetic isolation ring at the other end; multiple positioning blocks are distributed along the circumferential direction, and the clamp is sleeved on the outer surface of multiple positioning blocks and is used to clamp multiple positioning blocks.

[0018] Preferably, when assembling the front spindle and the rear spindle, the two positioning blocks are relatively mounted on the outer wall of the rear spindle, and the positioning surface is in contact with the outer surface of the rear spindle at one axial end and the outer surface of the magnetic isolation ring and magnetic steel assembly at the other end, and then the two positioning blocks are locked with multiple clamps; the same operation is used to install the front spindle to the upper end face of the magnetic isolation ring and magnetic steel assembly.

[0019] Preferably, the positioning protrusion is in the shape of a straight line distributed along the axial direction of the positioning block body; and the positioning surface is an arc surface or a plane.

[0020] Preferably, the arc angle between the two positioning protrusions in the circumferential direction is 45°, and the two positioning protrusions are symmetrically distributed along the center of the positioning block arc.

[0021] Preferably, the sleeve tooling includes a sleeve hole and a pressing surface, the sleeve hole is used to be passed through by the outer end of the front spindle, and the pressing surface is used to contact the upper end surface of the magnetic steel sleeve.

[0022] The advantages of the magnetic levitation motor rotor assembly method and tooling using the above technical solution of the present invention are:

[0023] The magnetic isolation ring and magnetic steel assembly are assembled above the rear spindle in a vertical assembly manner, and the front spindle is assembled above the magnetic isolation ring and magnetic steel assembly, and then they are coaxially positioned in the horizontal direction; the magnetic isolation ring and magnetic steel assembly and the front spindle are supported by the rear spindle and the magnetic isolation ring and magnetic steel assembly below in the vertical direction respectively to overcome their own gravity, and no additional supporting devices are required; thereby avoiding the need for other devices to support and overcome gravity during horizontal assembly, and reducing the number of positioning devices in the tooling; at the same time, after the magnetic isolation ring and magnetic steel assembly and the front spindle are supported in the vertical direction, they only need to overcome the small friction between them and the parts below to adjust their positions during coaxial positioning in the horizontal direction; thereby avoiding the need to overcome their own gravity to move parts vertically to adjust their positions during horizontal assembly, and reducing the labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a flow chart of the magnetic levitation motor rotor assembly method.

[0025] Figure 2 This is a schematic diagram of the structure of the motor shaft positioning tooling.

[0026] Figure 3 This is a structural diagram of the positioning block.

[0027] Figure 4 It is a structural diagram of the magnetic isolation ring and magnetic steel assembly.

[0028] Figure 5 This is a structural diagram of the magnetic steel assembly tooling.

[0029] Figure 6 Schematic diagram of the structure of the magnetic levitation motor rotor.

[0030] Figure 7 Schematic diagram of the structure of the sheath tooling.

[0031] Figure 8 This is a partially enlarged structural diagram of the sheath tooling.

[0032] 9-Sheath tooling. DETAILED DESCRIPTION

[0033] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] Example 1

[0035] like Figure 1 A method for assembling a magnetic levitation motor rotor is shown. The magnetic levitation motor rotor includes a motor shaft, a fixed sleeve on the motor shaft is provided with a magnetic steel sleeve 41, a front shrink sleeve assembly 42, a thrust plate 43 and a rear shrink sleeve assembly 44; the motor shaft includes a magnetic steel 1, a magnetic isolation ring 2, a front spindle 3, a rear spindle 4, a positioning step 45 and an upper positioning surface 46; the tooling used in this method includes a magnetic steel assembly tooling, a motor shaft positioning tooling and a sleeve tooling; the method includes the following steps:

[0036] (S1) Assembling the magnetic isolation rings and magnetic steels: Apply a set amount of metal adhesive to both end surfaces of the plurality of magnetic steels 1 and the inner end surfaces of the two magnetic isolation rings 2; after the application is completed, the magnetic isolation rings 2 and the magnetic steels 1 are placed close together in the magnetic steel assembly tool in the order of installation, and the magnetic steel assembly tool presses them tightly and leaves them to stand for the metal adhesive to take effect;

[0037] (S2) Assembling the front spindle and the rear spindle: Apply metal adhesive to both ends of the magnetic isolation ring 2 and the magnetic steel 1 assembly; Place the rear spindle 4 vertically on the workbench, place the magnetic isolation ring 2 and the magnetic steel 1 assembly on the inner side of the rear spindle 4, and make the lower end surface of the magnetic isolation ring 2 and the magnetic steel 1 assembly fit with the inner side of the rear spindle 4; Use the positioning fixture of the motor shaft to adjust the magnetic isolation ring 2 and the magnetic steel 1 assembly in the horizontal direction to be coaxial with the rear spindle 4 and lock the two, and then use the same operation to install the front spindle 3 to the upper end surface of the magnetic isolation ring 2 and the magnetic steel 1 assembly, and let it stand for the metal adhesive to take effect;

[0038] (S3) Cutting the motor shaft: remove the positioning fixture of the motor shaft, and process the motor shaft formed by bonding in the previous step to form a positioning step 45 and an upper positioning surface 46;

[0039] (S4) Assembling the magnetic steel sheath: shrink-fitting the magnetic steel sheath 41 onto the outer wall of the motor shaft, at which point the lower end face of the magnetic steel sheath 41 is in contact with one end face of the positioning step 45, and the upper end face of the magnetic steel sheath 41 is higher than the upper positioning surface 46; placing a sheath fixture on the outer wall of the front spindle 3, with the bottom face of the sheath fixture in contact with the upper end face of the magnetic steel sheath 41, and pressing the upper end face of the sheath fixture with a hydraulic press; after the motor shaft and magnetic steel sheath 41 assembly cools, removing the sheath fixture and cutting the upper end face of the magnetic steel sheath 41 until it is flush with the upper positioning surface 46;

[0040] (S5) Shrink-fitting the remaining parts of the motor rotor and cutting them to the final size: The front shrink-fit assembly 42, the thrust plate 43 and the rear shrink-fit assembly 44 are shrink-fitted to the outer wall of the motor shaft respectively, and then cut to reach the final design size, and then the parts that need to be magnetized are magnetized to complete the assembly process of the magnetic levitation motor rotor.

[0041] In this method, the magnetic shielding ring 2 and the magnetic steel 1 assembly are assembled above the rear spindle 4 in a vertical assembly manner, and the front spindle 3 is assembled above the magnetic shielding ring 2 and the magnetic steel 1 assembly, and then they are coaxially positioned in the horizontal direction; the magnetic shielding ring 2 and the magnetic steel 1 assembly and the front spindle 3 are supported in the vertical direction by the rear spindle 4 and the magnetic shielding ring 2 and the magnetic steel 1 assembly below respectively to overcome their own gravity, and no additional supporting device is required; thereby avoiding the need for other devices to support and overcome gravity during horizontal assembly, and reducing the number of positioning devices in the tooling; at the same time, after the magnetic shielding ring 2 and the magnetic steel 1 assembly and the front spindle 3 are supported in the vertical direction, they only need to overcome the small friction between them and the parts below to adjust their position when they are coaxially positioned in the horizontal direction; thereby avoiding the need to overcome their own gravity to move parts vertically to adjust their position during horizontal assembly, and reducing the labor intensity of workers.

[0042] like Figure 4 、 Figure 6 As shown, multiple magnets 1 are stacked and distributed along the axial direction, and two adjacent magnets 1 are fixedly connected by glue; two magnetic isolation rings 2 are respectively located on both sides of the stacked magnets 1 and are respectively fixedly connected to the outermost magnets 1 by glue; the inner end faces of the front spindle 3 and the inner end faces of the rear spindle 4 are respectively connected to the outer end faces of the two magnetic isolation rings 2 by glue. One end face of the magnetic steel sheath 41 is in contact with one end face of the positioning step 45, and the other end face of the magnetic steel sheath 41 is flush with the upper positioning surface 46; the end face of the front shrink sleeve assembly 42 is in contact with the upper positioning surface 46; one end face of the thrust plate 43 is in contact with the other end face of the positioning step 45, and the other end face of the thrust plate 43 is in contact with the end face of the rear shrink sleeve assembly 44.

[0043] First, wipe the two magnetic isolation rings 2 and the end faces of multiple magnetic steels 1 with alcohol, and then apply metal adhesive after the alcohol evaporates; first, wipe the magnetic isolation ring 2 and magnetic steel 1 assembly, the inner side of the front spindle 3, and the inner side of the rear spindle 4 with alcohol, and then apply metal adhesive after the alcohol evaporates.

[0044] After placing the magnetic isolation ring 2 and the magnet 1 close together on the magnet assembly tooling, rotate each magnetic isolation ring 2 and magnet 1 360°. After the magnetic isolation ring 2 and magnet 1 assembly is placed vertically on the inner side of the rear spindle 4, rotate the magnetic isolation ring 2 and magnet 1 assembly 360°. After the front spindle 3 is placed vertically on the magnetic isolation ring 2 and magnet 1 assembly, rotate the front spindle 3 360°. Rotating the corresponding parts 360° can expel bubbles between the parts and make the metal adhesive more uniform, ensuring bonding strength.

[0045] like Figure 5 As shown, the magnetic steel assembly tooling includes a magnetic steel base 5, a tightening screw 6 and a tightening block 7; the magnetic steel base 5 is provided with a positioning groove 51, a positioning side 52 and a screw hole, the positioning groove 51 is a V-shaped groove, and the two side surfaces of the V-shaped groove are respectively in contact with the outer surfaces of multiple magnetic steels 1 and multiple magnetic isolation rings 2; the positioning side 52 is in contact with the outer end face of one of the magnetic isolation rings 2; one end of the tightening screw 6 passes through the screw hole and is screwed into the corresponding screw hole, and the tightening block 7 is fixedly arranged at one end of the tightening screw 6, and the outer end face of the tightening block 7 is in contact with the outer end face of another magnetic isolation ring 2. When assembling the magnets: Wipe the end faces of the two magnetic isolation rings 2 and the three magnetic steels 1 with alcohol. After the alcohol evaporates, apply a predetermined amount of metal adhesive to both end faces of the three magnetic steels 1 and the inner end faces of the two magnetic isolation rings 2. Once applied, place the magnetic isolation rings 2 and the magnetic steels 1 close together in the positioning grooves 51 according to the installation sequence. Then, tighten the screws 6, which in turn drives the clamping block 7 forward to press the magnetic isolation rings 2 and magnetic steel 1 assembly together. Let it stand and wait for the metal adhesive to take effect, completing the magnetic assembly process. In this method, a V-shaped groove is used to simultaneously position the magnetic isolation rings 2 and the magnetic steel 1, thereby ensuring concentricity after the magnetic isolation rings 2 and the magnetic steel 1 are bonded.

[0046] When assembling the magnetic isolation ring and the magnet by the magnetic steel assembly tool, the magnetic isolation ring 2 and the magnet 1 are placed closely in the positioning groove 51; then the tightening screw 6 is rotated to drive the pressing block 7 to move forward to press the magnetic isolation ring 2 and the magnet 1 assembly.

[0047] like Figure 2 、 Figure 3The positioning fixture of the motor shaft includes multiple positioning blocks 81 and clamps 82; the positioning block 81 includes a positioning block body 83 and a positioning protrusion 84, the positioning block body 83 is in the shape of an arc, and the two positioning protrusions 84 are located on the inner side of the arc of the positioning block body 83; the positioning protrusion 84 is provided with a positioning surface 85, and the inscribed circle diameter of the positioning surfaces 85 of the two positioning protrusions 84 is the same as the diameter of the magnet; the positioning surface 85 is used to fit with the outer surface of the front main shaft or the rear main shaft at one axial end, and the other end is used to fit with the outer surface of the magnet or the magnetic isolation ring; multiple positioning blocks 81 are distributed along the circumferential direction, and the clamp 82 is sleeved on the outer surface of multiple positioning blocks 81 and is used to clamp multiple positioning blocks 81. In this manner, when the positioning block 81 is close to and fits the outer surface of the front spindle or the rear spindle, taking into account manufacturing errors and other reasons, one positioning protrusion 84 of the positioning block 81 first fits the outer surface of the front spindle or the rear spindle; since only one positioning protrusion 84 fits, the positioning block 81 is not stable, so when the clamp 82 locks the positioning block 81, the other positioning protrusion 84 of the positioning block 81 also fits close to and fits the outer surface of the front spindle or the rear spindle and has stability; that is, both positioning protrusions 84 can fit the outer surface of the front spindle or the rear spindle to position it; when multiple positioning blocks 81 are locked by the clamp 82 at the same time, the two positioning protrusions 84 of each positioning block 81 have a positioning function; thereby increasing the positioning part of the positioning tooling and improving the positioning accuracy during motor shaft assembly.

[0048] When assembling the front spindle and the rear spindle, the two positioning blocks 81 are relatively mounted on the outer wall of the rear spindle 4, and the positioning surface 85 is in contact with the outer surface of the rear spindle 4 at one axial end and in contact with the outer surface of the magnetic isolation ring 2 and the magnetic steel 1 assembly at the other end, and then the two positioning blocks 81 are locked with multiple clamps 82; the same operation is used to install the front spindle 3 to the upper end surface of the magnetic isolation ring 2 and the magnetic steel 1 assembly.

[0049] The positioning protrusion 84 is in the shape of a straight line distributed along the axial direction of the positioning block body 83; the positioning surface 85 is an arc surface or a plane surface.

[0050] The arc angle between the two positioning protrusions 84 in the circumferential direction is 45°, and the two positioning protrusions 84 are symmetrically distributed along the arc center of the positioning block 81.

[0051] like Figure 7 、 Figure 8As shown, the sheath fixture includes a sheath hole 47 and a pressing surface 48. The sheath hole 47 is used to be passed through by the outer end of the front spindle 3, and the pressing surface 48 is used to contact the upper end surface of the magnetic steel sheath 41. After the magnetic steel sheath 41 is shrink-fitted onto the outer wall of the motor shaft, the lower end surface of the magnetic steel sheath 41 is aligned with one end surface of the positioning step 45, and the upper end surface of the magnetic steel sheath 41 is higher than the upper positioning surface 46. The sheath fixture is placed on the outer wall of the front spindle 3, and the pressing surface 48 of the sheath fixture is aligned with the upper end surface of the magnetic steel sheath 41. The upper end surface of the sheath fixture is pressed with a hydraulic press. After the motor shaft and magnetic steel sheath 41 assembly has cooled, the sheath fixture is removed, and the upper end surface of the magnetic steel sheath 41 is cut until it is flush with the upper positioning surface 46. In this way, the upper end surface of the magnetic steel sheath 41 after heat-shrinkage is pressed down by the sheath tooling to prevent the magnetic steel sheath 41 from shrinking during cooling and causing a gap between its lower end surface and the positioning step 45, thereby ensuring the assembly accuracy of the magnetic steel sheath 41.

Claims

1. A method for assembling a magnetic levitation motor rotor, characterized in that: The magnetic suspension motor rotor comprises a motor shaft, a fixed sleeve on the motor shaft is provided with a magnetic steel sleeve (41), a front shrink sleeve assembly (42), a thrust plate (43) and a rear shrink sleeve assembly (44); the motor shaft comprises a magnetic steel (1), a magnetic isolation ring (2), a front main shaft (3), a rear main shaft (4), a positioning step (45) and an upper positioning surface (46); the tooling used in the method comprises a magnetic steel assembly tooling, a motor shaft positioning tooling and a sleeve tooling; the method comprises the following steps: (S1) Assembling the magnetic isolation ring and the magnetic steel: applying a set amount of metal adhesive to both end surfaces of the plurality of magnetic steels (1) and the inner end surfaces of the two magnetic isolation rings (2); after the application is completed, the magnetic isolation rings (2) and the magnetic steels (1) are placed closely together in the magnetic steel assembly tool in accordance with the installation sequence, and the magnetic steel assembly tool presses them tightly and leaves them to stand, waiting for the metal adhesive to take effect; (S2) Assembling the front spindle and the rear spindle: applying metal adhesive to both ends of the magnetic isolation ring (2) and the magnetic steel (1) assembly; placing the rear spindle (4) vertically on a workbench, placing the magnetic isolation ring (2) and the magnetic steel (1) assembly on the inner side surface of the rear spindle (4), and the lower end surface of the magnetic isolation ring (2) and the magnetic steel (1) assembly is in contact with the inner side surface of the rear spindle (4); using a positioning fixture for the motor shaft to adjust the magnetic isolation ring (2) and the magnetic steel (1) assembly in a coaxial state with the rear spindle (4) in a horizontal direction and lock the two, and then using the same operation to install the front spindle (3) on the upper end surface of the magnetic isolation ring (2) and the magnetic steel (1) assembly, and leaving it to stand until the metal adhesive takes effect; (S3) Cutting the motor shaft: removing the positioning fixture of the motor shaft, and processing the motor shaft formed by bonding in the previous step to form a positioning step (45) and an upper positioning surface (46); (S4) Assembling the magnetic steel sleeve: heat-shrink-fitting the magnetic steel sleeve (41) onto the outer wall of the motor shaft, wherein the lower end surface of the magnetic steel sleeve (41) is in contact with one end surface of the positioning step (45), and the upper end surface of the magnetic steel sleeve (41) is higher than the upper positioning surface (46); placing a sleeve tooling on the outer wall of the front spindle (3), wherein the bottom surface of the sleeve tooling is in contact with the upper end surface of the magnetic steel sleeve (41), and pressing the upper end surface of the sleeve tooling with a hydraulic press; after the motor shaft and the magnetic steel sleeve (41) assembly are cooled, removing the sleeve tooling, and cutting the upper end surface of the magnetic steel sleeve (41) until it is flush with the upper positioning surface (46); (S5) heat-shrink-fitting the remaining parts of the motor rotor and cutting them to the final size: heat-shrink-fitting the front heat-shrink-fitting assembly (42), the thrust plate (43) and the rear heat-shrink-fitting assembly (44) to the outer wall of the motor shaft respectively, and then cutting them to reach the final design size, and then magnetizing the parts that need to be magnetized to complete the assembly process of the magnetic suspension motor rotor; The magnetic steel assembly tool comprises a magnetic steel base (5), a tightening screw (6) and a clamping block (7); the magnetic steel base (5) is provided with a positioning groove (51), a positioning side surface (52) and a screw hole, the positioning groove (51) is a V-shaped groove, and the two side surfaces of the V-shaped groove are respectively in contact with the outer surfaces of the plurality of magnetic steels (1) and the two magnetic isolation rings (2); the positioning side surface (52) is in contact with the outer end surface of one of the magnetic isolation rings (2); one end of the tightening screw (6) passes through the screw hole and is screwed into the screw hole, and the clamping block (7) is fixedly arranged at one end of the tightening screw (6), and the outer end surface of the clamping block (7) is in contact with the outer end surface of the other magnetic isolation ring (2); The positioning fixture of the motor shaft comprises a plurality of positioning blocks (81) and a clamp (82); the positioning block (81) comprises a positioning block body (83) and a positioning protrusion (84); the positioning block body (83) is in the shape of an arc, and the two positioning protrusions (84) are located on the inner side of the arc of the positioning block body (83); the positioning protrusion (84) is provided with a positioning surface (85), and the diameter of the inscribed circle of the positioning surfaces (85) of the two positioning protrusions (84) is the same as the diameter of the magnetic steel; the positioning surface (85) is used to fit with the outer surface of the front main shaft or the rear main shaft at one axial end, and is used to fit with the outer surface of the magnetic steel or the magnetic isolation ring at the other end; the plurality of positioning blocks (81) are distributed along the circumferential direction, and the clamp (82) is sleeved on the outer surface of the plurality of positioning blocks (81) and is used to clamp the plurality of positioning blocks (81); The sheath tooling comprises a sheath hole (47) and a pressing surface (48), wherein the sheath hole (47) is used for the outer end of the front spindle (3) to pass through, and the pressing surface (48) is used for contacting the upper end surface of the magnetic steel sheath (41).

2. According to claim 1, a method for assembling a magnetic levitation motor rotor is characterized in that: First, wipe the end surfaces of the two magnetic isolation rings (2) and the plurality of magnetic steels (1) with alcohol, and then apply the metal adhesive after the alcohol evaporates; first, wipe the magnetic isolation ring (2) and magnetic steel (1) assembly, the inner side surface of the front spindle (3) and the inner side surface of the rear spindle (4) with alcohol, and then apply the metal adhesive after the alcohol evaporates.

3. The method for assembling a magnetic levitation motor rotor according to claim 1, characterized in that: After the magnetic isolation ring (2) and the magnetic steel (1) are placed closely together on the magnetic steel assembly tooling, each magnetic isolation ring (2) and the magnetic steel (1) are rotated 360 degrees; after the magnetic isolation ring (2) and the magnetic steel (1) assembly is vertically placed on the inner side surface of the rear spindle (4), the magnetic isolation ring (2) and the magnetic steel (1) assembly is rotated 360 degrees; after the front spindle (3) is vertically placed on the magnetic isolation ring (2) and the magnetic steel (1) assembly, the front spindle (3) is rotated 360 degrees.

4. A method for assembling a magnetic levitation motor rotor according to claim 1, characterized in that: When the magnetic steel assembly tool assembles the magnetic isolation ring and the magnetic steel, the magnetic isolation ring (2) and the magnetic steel (1) are placed closely together in the positioning groove (51); then the tightening screw (6) is turned to drive the pressing block (7) to move forward to press the magnetic isolation ring (2) and the magnetic steel (1) assembly.

5. The method for assembling a magnetic levitation motor rotor according to claim 1, characterized in that: When assembling the front spindle and the rear spindle, the two positioning blocks (81) are relatively sleeved on the outer wall of the rear spindle (4), and the positioning surface (85) is in contact with the outer surface of the rear spindle (4) at one axial end and in contact with the outer surface of the magnetic isolation ring (2) and the magnetic steel (1) assembly at the other end, and then the two positioning blocks (81) are locked with a plurality of clamps (82); the front spindle (3) is installed on the upper end surface of the magnetic isolation ring (2) and the magnetic steel (1) assembly using the same operation.

6. A method for assembling a magnetic levitation motor rotor according to claim 1, characterized in that: The positioning protrusion (84) is in the shape of a straight line distributed along the axial direction of the positioning block body (83); and the positioning surface (85) is an arc surface or a plane surface.

7. A method for assembling a magnetic levitation motor rotor according to claim 1, characterized in that: The arc angle between the two positioning protrusions (84) in the circumferential direction is 45°, and the two positioning protrusions (84) are symmetrically distributed along the arc center of the positioning block (81).

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