A positioning tool for a magnetic suspension motor shaft, a motor rotor and an assembly method

Abstract

The present invention relates to the field of magnetic levitation motor shafts, and in particular to a positioning tool, motor rotor and assembly method for a magnetic levitation motor shaft. The tool comprises a plurality of positioning blocks and a clamp; the positioning block comprises a positioning block body and a positioning protrusion, the positioning block body is in the shape of an arc, and 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 magnetic steel; the positioning surface is used to fit with the outer surface of the front spindle or the rear spindle at one axial end, and the other end is used to fit with the outer surface of the magnetic steel or the magnetic isolation ring; a plurality of positioning blocks are distributed along the circumferential direction, and the clamp is sleeved on the outer surface of the plurality of positioning blocks, and is used to clamp the plurality of positioning blocks. The tool adds a positioning part to the positioning tool, which improves the positioning accuracy during the assembly of the motor shaft.

Description

Technical Field

[0001] The invention relates to the field of magnetic suspension motor shafts, and in particular to a positioning tool for a magnetic suspension motor shaft, a motor rotor and an assembly method. Background Art

[0002] With the development of science and technology and the demand for production, magnetic levitation high-speed motors have become one of the hot spots in the international electrical engineering field. Due to the advantages of high energy density, small structural size, and high efficiency, magnetic levitation high-speed motors have been 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 scope is still expanding. During the operation of the magnetic levitation motor, the stability of the motor rotor is the key to ensuring the smooth and efficient operation of the motor. The magnetic properties of the permanent magnets of the motor rotor and the dynamic balance of the rotor itself directly affect the working performance of the magnetic levitation motor.

[0003] The Chinese invention patent application (publication number CN108988534B, publication date: 20200619) discloses a high-speed permanent magnet motor rotor and a processing method thereof, including a rotating shaft, the rotating shaft includes a first shaft body, a second shaft body and a third shaft body from left to right, the first shaft body and the third shaft body are heat-matched and tightly matched with a magnetic bearing sensor rotor assembly, a magnetic bearing sensor rotor silicon steel sheet, a magnetic bearing rotor assembly and a magnetic bearing rotor silicon steel sheet, and the second shaft body is sleeved with a rotor core, and the outer periphery of the rotor core is provided with a surface-mounted permanent magnet, and the outer periphery of the permanent magnet is covered with a carbon fiber sheath. The rotor of the present invention has a compact and reliable overall structure; strong resistance to radial tension and tangential stress; effectively protects the permanent magnets in the permanent magnet motor; has strong heat dissipation capacity; the processing method of the present invention can reasonably and efficiently realize the processing of high-quality high-speed permanent magnet motor rotors through close cooperation between different steps.

[0004] The prior art has the following deficiencies: when the front spindle or rear spindle of the same diameter is coaxially positioned and bonded to the magnetic steel and magnetic isolation ring assembly, a cylindrical positioning fixture is used for positioning; one end of the internal cylindrical hole of the cylindrical positioning fixture is sleeved on the outer wall of the front spindle or the rear spindle, and the other end is sleeved on the outer surface of the magnetic steel and the magnetic isolation ring assembly, and then the two parts inside the internal cylindrical hole are coaxially positioned by fitting with the inner wall of the cylindrical hole with the same diameter; in this way, due to manufacturing and other reasons, the inner hole diameter of the cylindrical hole of the positioning fixture may not be completely the same as the diameter of the magnetic steel, so that the outer surface of the front spindle or the rear spindle and the magnetic steel and the magnetic isolation ring assembly cannot completely fit the cylindrical hole, and can only achieve single line contact with the inner wall of the cylindrical hole; as a result, the cylindrical hole has less positioning parts for the front spindle or the rear spindle and the magnetic steel and the magnetic isolation ring assembly, which reduces the positioning accuracy during motor shaft assembly. Summary of the invention

[0005] The purpose of the present invention is: to address the above-mentioned problems, to propose setting the positioning tool as a plurality of arc-shaped positioning blocks, and to provide two positioning protrusions on the arc-shaped positioning blocks to ensure that they simultaneously achieve double-line contact with the front main shaft or the rear main shaft and the outer wall of the magnetic steel and magnetic isolation ring assembly; to increase the positioning part of the positioning tool, and to improve the positioning accuracy during the assembly of the motor shaft, to provide a positioning tool for a magnetic levitation motor shaft, a motor rotor and an assembly method.

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

[0007] A positioning fixture for a magnetic levitation motor shaft, the fixture comprising a plurality of positioning blocks and a clamp; the positioning block comprises a positioning block body and a positioning protrusion, the positioning block body is in the shape of an arc, and 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 diameters of the positioning surfaces of the two positioning protrusions are the same as the diameter of the magnetic steel; 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 magnetic steel or the magnetic isolation ring at the other end; the plurality of positioning blocks are distributed along the circumferential direction, and the clamp is sleeved on the outer surfaces of the plurality of positioning blocks and is used to clamp the plurality of positioning blocks.

[0008] Preferably, the positioning protrusion is in the shape of a straight line distributed along the axial direction of the positioning block body. The positioning surface is an arc surface or a plane surface.

[0009] 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 arc of the positioning block.

[0010] In addition, the present invention also discloses a magnetic levitation motor shaft, which is positioned using the positioning tooling of the magnetic levitation motor shaft; the motor shaft includes a magnetic steel, a magnetic isolation ring, a front spindle and a rear spindle; a plurality of magnetic steels are stacked and distributed along the axial direction, and two adjacent magnetic steels are fixedly connected by glue; the two magnetic isolation rings are respectively located on both sides of the stacked magnetic steels and are respectively fixedly connected to the outermost magnetic steels by glue; the inner end face of the front spindle and the inner end face of the rear spindle are respectively connected to the outer end faces of the two magnetic isolation rings by glue.

[0011] In addition, the present invention also discloses a magnetic steel assembly tool for a magnetic levitation motor shaft, which is used to assemble the magnetic steel of the magnetic levitation motor shaft; the tool includes a magnetic steel base, a tightening screw and a clamping block; the magnetic steel base is provided with a positioning groove, a positioning side surface 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 magnetic steels and multiple magnetic isolation rings; the positioning side surface is in contact with the outer end surface 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 clamping block is fixedly arranged at one end of the tightening screw, and the outer end surface of the clamping block is in contact with the outer end surface of another magnetic isolation ring.

[0012] In addition, the present invention also discloses a magnetic levitation motor rotor, which includes a motor shaft, a fixed sleeve on the motor shaft is provided with a magnetic steel sleeve, a front heat sleeve assembly, a thrust plate and a rear heat sleeve assembly; the motor shaft is provided with a positioning step and an upper positioning surface, one end face of the magnetic steel sleeve is in contact with one end face of the positioning step, and the other end face of the magnetic steel sleeve is flush with the upper positioning surface; the end face of the front heat sleeve assembly is in contact with the upper positioning surface; one end face of the thrust plate is in contact with the other end face of the positioning step, and the other end face of the thrust plate is in contact with the end face of the rear heat sleeve assembly.

[0013] In addition, the present invention also discloses a sleeve tooling for a magnetic levitation motor shaft, which is used to press the magnetic steel sleeve to the outer wall of the motor shaft; 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 main shaft, and the pressing surface is used to contact the upper end surface of the magnetic steel sleeve.

[0014] In addition, the present invention also discloses a magnetic levitation motor rotor assembly method, which is used to assemble the magnetic levitation motor rotor, and the method comprises the following steps:

[0015] (S1) Assemble the magnetic isolation ring and the magnetic steel: wipe the end faces of the two magnetic isolation rings and the three magnetic steels with alcohol, and after the alcohol evaporates, apply a set amount of metal adhesive to the two end faces of the three magnetic steels and the inner end faces of the two magnetic isolation rings; after the application is completed, place the magnetic isolation rings and the magnetic steels closely in the positioning grooves in the order of installation; then turn the tightening screws to drive the pressing block to move forward to press the magnetic isolation ring and the magnetic steel assembly, and let it stand and wait for the metal adhesive to take effect;

[0016] (S2) Assemble the front spindle and the rear spindle: wipe the inner side surfaces of the front spindle and the rear spindle with alcohol respectively, and 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 surface of the rear spindle, and the lower end surface of the magnetic isolation ring and the magnetic steel assembly fits with the inner side surface of the rear spindle; sleeve two positioning blocks on the outer wall of the rear spindle oppositely, and the positioning surface fits with the outer surface of the rear spindle at one axial end and fits with the outer surface of the magnetic isolation ring and the magnetic steel assembly at the other end, and then lock the two positioning blocks with multiple clamps; 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;

[0017] (S3) Cutting the motor shaft: remove the positioning block and the clamp, and process the positioning step and the upper positioning surface of the motor shaft formed by the bonding in the previous step;

[0018] (S4) Assembling the magnetic steel sleeve: heat-shrink-fit the magnetic steel sleeve onto the outer wall of the motor shaft, at which time 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; the sleeve tooling is set on the outer wall of the front spindle, the pressing surface of the sleeve tooling is in contact with the upper end face of the magnetic steel sleeve, and the upper end face of the sleeve tooling is pressed with a hydraulic press; after the motor shaft and the magnetic steel sleeve assembly are cooled, the sleeve tooling is removed, and the upper end face of the magnetic steel sleeve is cut to be flush with the upper positioning face;

[0019] (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 they are cut to reach the final design size, and then the parts that need to be magnetized are magnetized to complete the processing process of the magnetic levitation motor rotor.

[0020] Preferably, after the magnetic isolation rings and magnets are placed closely in the positioning grooves, 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°.

[0021] The advantages of the positioning fixture for the shaft of a magnetic suspension motor, the motor rotor and the assembly method of the present invention using the above technical solution are:

[0022] When the locating block is close to fitting the outer surface of the front spindle or the rear spindle, taking into account manufacturing errors and other reasons, one locating protrusion of the locating block first fits with the outer surface of the front spindle or the rear spindle; since only one locating protrusion fits, the locating block is not stable, so when the clamp locks the locating block, the other locating protrusion of the locating block also fits closely to the outer surface of the front spindle or the rear spindle and has stability; that is, both locating protrusions can fit with the outer surface of the front spindle or the rear spindle to position it; when multiple locating blocks are locked by the clamp at the same time, the two locating protrusions of each locating block have a positioning function; thereby increasing the positioning part of the positioning tooling and improving the positioning accuracy during motor shaft assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2 This is a structural diagram of the positioning block.

[0025] Figure 3 It is a structural schematic diagram of the magnetic isolation ring and magnetic steel assembly.

[0026] Figure 4 This is a schematic diagram of the structure of the magnetic steel assembly tooling.

[0027] Figure 5This is a schematic diagram of the structure of the magnetic levitation motor rotor.

[0028] Figure 6 It is a schematic diagram of the structure of the sheath tooling.

[0029] Figure 7 This is a partially enlarged structural schematic diagram of the sheath tooling.

[0030] 9-Sheath tooling. DETAILED DESCRIPTION

[0031] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0032] Example 1

[0033] like Figure 1 , Figure 2 A positioning fixture for a magnetic levitation motor shaft is shown, the fixture comprising 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 an arc shape, 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 magnetic steel; the positioning surface 85 is used at one axial end to fit with the outer surface of the front main shaft or the rear main shaft, and the other end to fit with the outer surface of the magnetic steel or the magnetic isolation ring; 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. 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, the two positioning protrusions 84 can both 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.

[0034] The positioning protrusion 84 is a straight line shape distributed along the axial direction of the positioning block body 83. The positioning surface 85 is a circular arc surface or a plane. 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.

[0035] like Figure 1 , Figure 3As shown, a magnetic levitation motor shaft is positioned by using the positioning tool of the magnetic levitation motor shaft; the motor shaft includes a magnetic steel 1, a magnetic isolation ring 2, a front spindle 3 and a rear spindle 4; a plurality of magnetic steels 1 are stacked and distributed along the axial direction, and two adjacent magnetic steels 1 are fixedly connected by glue; two magnetic isolation rings 2 are respectively located on both sides of the stacked magnetic steels 1 and are respectively fixedly connected to the outermost magnetic steels 1 by glue; the inner end face of the front spindle 3 and the inner end face of the rear spindle 4 are respectively connected to the outer end faces of the two magnetic isolation rings 2 by glue.

[0036] like Figure 4 As shown, a magnetic steel assembly tool for a magnetic levitation motor shaft is used to assemble the magnetic steel 1 of the magnetic levitation motor shaft; the 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 multiple magnetic steels 1 and multiple 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 with the corresponding 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 another magnetic isolation ring 2. When assembling the magnetic steel: wipe the end faces of the two magnetic isolation rings 2 and the three magnetic steels 1 with alcohol, and after the alcohol evaporates, apply a set amount of metal adhesive to the two end faces of the three magnetic steels 1 and the inner end faces of the two magnetic isolation rings 2; after the application is completed, place the magnetic isolation rings 2 and the magnetic steels 1 closely in the positioning groove 51 in sequence according to the installation order; then turn the tightening screw 6 to drive the clamping block 7 to move forward to press the magnetic isolation ring 2 and the magnetic steel 1 assembly, let it stand, and wait for the metal adhesive to take effect to complete the magnetic steel assembly process. In this method, the V-shaped groove is used to simultaneously position the magnetic isolation ring 2 and the magnetic steel 1, thereby ensuring the concentricity of the magnetic isolation ring 2 and the magnetic steel 1 after bonding.

[0037] like Figure 5 As shown, a 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 is provided with a positioning step 45 and an upper positioning surface 46, one end surface of the magnetic steel sleeve 41 is in contact with one end surface of the positioning step 45, and the other end surface of the magnetic steel sleeve 41 is flush with the upper positioning surface 46; the end surface of the front shrink sleeve assembly 42 is in contact with the upper positioning surface 46; one end surface of the thrust plate 43 is in contact with the other end surface of the positioning step 45, and the other end surface of the thrust plate 43 is in contact with the end surface of the rear shrink sleeve assembly 44.

[0038] like Figure 6 , Figure 7As shown, a sheath fixture for a magnetic suspension motor shaft is used to press the magnetic steel sheath 41 to the outer wall of the motor shaft; 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 heat-fitted to the outer wall of the motor shaft, the lower end surface of the magnetic steel sheath 41 is in contact 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 set on the outer wall of the front spindle 3, the pressing surface 48 of the sheath fixture is in contact with the upper end surface of the magnetic steel sheath 41, and the upper end surface of the sheath fixture is pressed by a hydraulic press; after the motor shaft and the magnetic steel sheath 41 assembly are cooled, the sheath fixture is removed, and the upper end surface of the magnetic steel sheath 41 is cut to be 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.

[0039] In addition, the present invention also discloses a magnetic levitation motor rotor assembly method, which is used to assemble the magnetic levitation motor rotor, and the method comprises the following steps:

[0040] (S1) Assembling the magnetic isolation ring and the magnetic steel: wipe the end faces of the two magnetic isolation rings 2 and the three magnetic steels 1 with alcohol, and after the alcohol evaporates, apply a set amount of metal adhesive to the two end faces of the three magnetic steels 1 and the inner end faces of the two magnetic isolation rings 2; after the application is completed, place the magnetic isolation rings 2 and the magnetic steels 1 closely in the positioning groove 51 in sequence according to the installation order; then turn the tightening screw 6 to drive the pressing block 7 to move forward to press the magnetic isolation ring 2 and the magnetic steel 1 assembly, and let it stand to wait for the metal adhesive to take effect;

[0041] (S2) Assemble the front spindle and the rear spindle: wipe the inner side surfaces of the front spindle 3 and the inner side surfaces of the rear spindle 4 with alcohol respectively, and apply metal adhesive on 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 surface of the rear spindle 4, and the lower end surface of the magnetic isolation ring 2 and the magnetic steel 1 assembly fits with the inner side surface of the rear spindle 4; two positioning blocks 81 are relatively sleeved on the outer wall of the rear spindle 4, and the positioning surface 85 fits with the outer surface of the rear spindle 4 at one axial end and the outer surface of the magnetic isolation ring 2 and the magnetic steel 1 assembly at the other end, and then lock the two positioning blocks 81 with multiple clamps 82; 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 until the metal adhesive takes effect; in this method, the magnetic isolation ring 2 and the magnetic steel 1 assembly are assembled vertically. The magnetic steel 1 assembly is assembled onto the top of the rear spindle 4, and the front spindle 3 is assembled onto the top of the magnetic isolation ring 2 and magnetic steel 1 assembly, and then they are coaxially positioned in the horizontal direction; the magnetic isolation ring 2 and magnetic steel 1 assembly and the front spindle 3 are supported in the vertical direction by the rear spindle 4 and the magnetic isolation ring 2 and magnetic steel 1 assembly below respectively to overcome their own gravity, and no additional supporting device is required; thereby avoiding the situation where other devices are needed to support to overcome gravity during horizontal assembly, and reducing the number of positioning devices in the tooling; at the same time, after the magnetic isolation ring 2 and magnetic steel 1 assembly and the front spindle 3 are supported in the vertical direction, they only need to overcome the smaller friction between them and the parts below to adjust their position when they are coaxially positioned in the horizontal direction; thereby avoiding the situation where they need to overcome their own gravity to move parts vertically to adjust their positions during horizontal assembly, and reducing the labor intensity of workers.

[0042] (S3) Cutting the motor shaft: remove the positioning block 81 and the clamp 82, and process the positioning step 45 and the upper positioning surface 46 of the motor shaft formed by bonding in the previous step;

[0043] (S4) Assembling the magnetic steel sheath: heat-shrink-fit the magnetic steel sheath 41 onto the outer wall of the motor shaft, at which time 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 face 46; the sheath tooling is mounted on the outer wall of the front spindle 3, the pressing face 48 of the sheath tooling is in contact with the upper end face of the magnetic steel sheath 41, and the upper end face of the sheath tooling is pressed with a hydraulic press; after the motor shaft and the magnetic steel sheath 41 assembly are cooled, the sheath tooling is removed, and the upper end face of the magnetic steel sheath 41 is cut to be flush with the upper positioning face 46;

[0044] (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 they are cut to reach the final design size, and then the parts that need to be magnetized are magnetized to complete the processing process of the magnetic levitation motor rotor.

[0045] After the magnetic isolation ring 2 and the magnetic steel 1 are placed closely in the positioning groove 51, each magnetic isolation ring 2 and the magnetic steel 1 are rotated 360°; after the magnetic isolation ring 2 and the magnetic steel 1 assembly is vertically placed on the inner side of the rear spindle 4, the magnetic isolation ring 2 and the magnetic steel 1 assembly is rotated 360°; 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°. When the corresponding parts are rotated 360°, the bubbles between the parts can be driven out, and the metal adhesive can be made more uniform to ensure the bonding strength.

Claims

1. A method for assembling a magnetic levitation motor rotor, characterized in that: The method is used 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 (41), a front shrink sleeve assembly (42), a thrust plate (43) and a rear shrink sleeve assembly (44); the motor shaft being provided with a positioning step (45) and an upper positioning surface (46); one end surface of the magnetic steel sleeve (41) being in contact with one end surface of the positioning step (45), and the other end surface of the magnetic steel sleeve (41) being flush with the upper positioning surface (46); the end surface of the front shrink sleeve assembly (42) being in contact with the upper positioning surface (46); one end surface of the thrust plate (43) being in contact with the other end surface of the positioning step (45), and the other end surface of the thrust plate (43) being in contact with the end surface of the rear shrink sleeve assembly (44); The motor shaft further comprises a magnetic steel (1), a magnetic isolation ring (2), a front spindle (3) and a rear spindle (4); the plurality of magnetic steels (1) are stacked and distributed along the axial direction, and two adjacent magnetic steels (1) are fixedly connected by glue; the two magnetic isolation rings (2) are respectively located on both sides of the stacked magnetic steels (1) and are respectively fixedly connected to the outermost magnetic steels (1) by glue; the inner end face of the front spindle (3) and the inner end face of the rear spindle (4) are respectively connected to the outer end faces of the two magnetic isolation rings (2) by glue; The assembly equipment used in this method includes a positioning tool, a magnetic steel assembly tool and a sheath tool, wherein: The positioning tool is used for positioning when assembling the motor shaft, and the positioning tool 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 magnetic steel assembly tool is used to assemble the magnetic steel (1) of the magnetic suspension motor shaft; 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 with the screw hole, 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 sheath tool is used to press the magnetic steel sheath (41) onto the outer wall of the motor shaft; the sheath tool comprises a sheath hole (47) and a pressing surface (48); 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); The method comprises the following steps: (S1) Assembling the magnetic isolation ring and the magnetic steel: wipe the end faces of the two magnetic isolation rings (2) and the three magnetic steels (1) with alcohol, and after the alcohol evaporates, apply a set amount of metal adhesive to the two end faces of the three magnetic steels (1) and the inner end faces 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 in the positioning grooves (51) in the order of installation; then, the tightening screws (6) are turned to drive the pressing block (7) to move forward to press the magnetic isolation ring (2) and the magnetic steel (1) assembly together, and then stand still to wait for the metal adhesive to take effect; (S2) Assembling the front spindle and the rear spindle: clean the inner side of the front spindle (3) and the inner side of the rear spindle (4) with alcohol respectively, and 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). ; The two positioning blocks (81) are relatively sleeved on the outer wall of the rear main shaft (4), and the positioning surface (85) is in contact with the outer surface of the rear main shaft (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 main shaft (3) is installed on the upper end surface of the magnetic isolation ring (2) and the magnetic steel (1) assembly using the same operation, and the assembly is left to stand for the metal adhesive to take effect; (S3) Cutting the motor shaft: removing the positioning block (81) and the clamp (82), and processing the positioning step (45) and the upper positioning surface (46) of the motor shaft formed by bonding in the previous step; (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 face of the magnetic steel sleeve (41) is in contact with one end face of the positioning step (45), and the upper end face of the magnetic steel sleeve (41) is higher than the upper positioning face (46); sleeve-fitting the sleeve tooling onto the outer wall of the front spindle (3), wherein the pressing face (48) of the sleeve tooling is in contact with the upper end face of the magnetic steel sleeve (41), and the upper end face of the sleeve tooling is pressed with a hydraulic press; after the motor shaft and the magnetic steel sleeve (41) assembly are cooled, the sleeve tooling is removed, and the upper end face of the magnetic steel sleeve (41) is cut to be flush with the upper positioning face (46); (S5) Shrink-fitting the remaining parts of the motor rotor and cutting them to the final size: The front shrink-fitting assembly (42), the thrust plate (43) and the rear shrink-fitting 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 processing process of the magnetic suspension motor rotor.

2. The method 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).

3. The method according to claim 1, characterized in that: The positioning surface (85) is an arc surface or a plane surface.

4. The method 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).

5. The method according to claim 1, characterized in that: After the magnetic isolation ring (2) and the magnetic steel (1) are placed closely together in the positioning groove (51), 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.

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