A magnetic levitation motor assembly tooling, motor and assembly method

Abstract

The present invention relates to the field of magnetic levitation motors, and particularly to a magnetic levitation motor assembly tooling, a motor and an assembly method. The tooling includes a first tooling, a second tooling, a third tooling and a fourth tooling; the third tooling is provided with a tooling boss, and the tooling boss is provided with a boss inner hole axially penetrating therethrough; the fourth tooling is provided with a positioning groove. The tooling uses the outer wall of the fourth tooling to cooperate with the rear bearing seat and the rotor hole position of the motor stator, and at the same time the positioning groove cooperates with the outer surface of the rear end of the rotor; thereby guiding the rotor during assembly to prevent it from moving left and right, and avoiding the rotor from colliding and rubbing with the motor stator due to magnetic force, resulting in damage to the rotor surface; at the same time, a tooling boss is arranged between the inner hole of the axial magnetic bearing and the outer wall of the rotor to prevent the axial magnetic bearing from colliding with the outer wall of the rotor, and a fourth tooling made of sponge material is arranged below the axial magnetic bearing to prevent the axial magnetic bearing from suddenly falling due to the attraction force, causing injury to workers and damage to the axial magnetic bearing.

Description

Technical Field

[0001] The present invention relates to the field of magnetic levitation motors, and particularly to a magnetic levitation motor assembly tooling, a motor and an assembly method. Background Art

[0002] With the development of science and technology and the demands of production, magnetic levitation high-speed motors have become one of the research hotspots in the international electrical engineering field. Due to the advantages of high energy density, small structural size, high efficiency, etc., 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, flywheel energy storage, etc., and their application scope is still expanding continuously. During the operation of a magnetic levitation motor, the stability of the motor rotor is the key to ensuring the stable 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 utility model patent application (publication number CN210210199U, publication date: March 31, 2020) discloses a tooling for magnetic levitation bearing assembly, which includes an arc-shaped bearing sub-assembly connecting plate; one end of the bearing sub-assembly connecting plate is provided with a lifting plate, and the other end of the bearing sub-assembly connecting plate is provided with an arc-shaped bearing sub-assembly fixing table; the bearing sub-assembly fixing table is arranged on the inner side of the bearing sub-assembly connecting plate, and the lifting plate is arranged on the outer side of the bearing sub-assembly connecting plate; a plurality of bearing sub-assembly connection through holes are provided on the bearing sub-assembly fixing table. The tooling for magnetic levitation bearing assembly of the present invention solves the problem that it is difficult to perform the sub-assembly of large-diameter magnetic levitation bearings by manpower, improves the assembly efficiency of the magnetic levitation motor, and ensures the assembly accuracy of the magnetic levitation bearing.

[0004] The existing technology has the following deficiencies: During the assembly process, due to the strong magnetism in the rotor magnet part, the motor assembly process is relatively difficult, and the rotor will collide and rub with the motor stator due to the magnetic force, resulting in damage to the rotor surface. At the same time, during the downward pressing process of the axial magnetic bearing, due to the large magnetic force and the fact that the magnetic force will suddenly change from repulsive force to attractive force at a certain position during the downward pressing process, it is easy to cause injuries to workers and damage to the axial magnetic bearing due to collision. Summary of the Invention

[0005] The object of the present invention is: in view of the above problems, it is proposed to adopt the outer wall of the fourth tooling to cooperate with the rotor hole positions of the rear bearing seat and the motor stator, and at the same time, the positioning groove cooperates with the outer surface of the rear end of the rotor; furthermore, when assembling the rotor, it is guided to prevent it from moving left and right, and to avoid the rotor from colliding and rubbing with the motor stator due to magnetic force, resulting in damage to the rotor surface; at the same time, a tooling boss is provided between the inner hole of the axial magnetic bearing and the outer wall of the rotor to prevent the axial magnetic bearing from colliding with the outer wall of the rotor, and a fourth tooling made of sponge material is provided below the axial magnetic bearing to prevent the axial magnetic bearing from suddenly falling due to the attraction force, causing injury to workers and damage to the axial magnetic bearing. A magnetic levitation motor assembly tooling, a motor and an assembly method.

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

[0007] A magnetic levitation motor assembly tooling, which includes a first tooling, a second tooling, a third tooling and a fourth tooling; the first tooling is provided with a support surface and a first hole position, the support surface is used to fit and support the end face of the front bearing seat, and the first hole position is used to accommodate the part of the rotor front end protruding from the front bearing seat; the second tooling is provided with a second hole position and a tooling opening arranged radially, the second hole position is used to be sleeved on the outer wall of the rotor, the second tooling is divided into two non-connected parts at the tooling opening position, and the material of the second tooling is sponge; the third tooling is provided with a tooling boss, and the tooling boss is provided with a boss inner hole penetrating axially; the boss inner hole is used to be sleeved on the outer wall of the rotor, and the outer wall of the tooling boss is used to be embedded in the inner hole of the axial magnetic bearing; the outer surface of the fourth tooling is used to cooperate with the rotor hole positions of the rear bearing seat and the motor stator, and the fourth tooling is provided with a positioning groove, and the inner surface of the positioning groove cooperates with the outer surface of the rear end of the rotor.

[0008] Preferably, the material of the first tooling is aluminum alloy. The material of the third tooling is aluminum alloy. The material of the fourth tooling is hard rubber.

[0009] Preferably, the diameter of the first hole position is larger than the diameter of the part of the rotor front end protruding from the front bearing seat.

[0010] Preferably, there is a gap between the boss inner hole and the outer wall of the rotor.

[0011] Preferably, the height of the tooling boss is less than the axial length of the inner hole of the axial magnetic bearing.

[0012] In addition, the present invention also discloses a magnetic levitation motor, which is assembled by using the described assembly tooling. The motor includes a front bearing housing, a rotor, a thrust disc, an axial spacer, an axial magnetic bearing, a radial magnetic bearing, a rear bearing housing, and a motor stator. The front bearing housing and the rear bearing housing are respectively located at the front and rear ends of the motor stator. Two axial magnetic bearings and one radial magnetic bearing are all located in the front bearing housing, and the other radial magnetic bearing is located in the rear bearing housing. The thrust disc is fixed to the rotor. The axial magnetic bearings and the radial magnetic bearing are all sleeved on the outer wall of the rotor, and the two axial magnetic bearings are respectively located at the two axial ends of the thrust disc.

[0013] In addition, the present invention also discloses a method for assembling a magnetic levitation motor, which is used to assemble the above-mentioned magnetic levitation motor. The method includes the following steps:

[0014] (S1) After installing a radial magnetic bearing into the front bearing housing, place the front bearing housing on the support surface of the first tooling, and then install an axial magnetic bearing and an axial spacer in sequence at the corresponding positions on the front bearing housing according to the installation order.

[0015] (S2) Fix and install the thrust disc to the rotor; then turn the thrust disc downward, align the center of the rotor with the center hole of the front bearing housing, and install the thrust disc onto the front bearing housing.

[0016] (S3) Place the second tooling on the upper surface of the front bearing housing; then respectively sleeve another axial magnetic bearing and the third tooling on the outer wall of the rotor. The third tooling is located above the axial magnetic bearing, and the outer wall of the tooling boss is embedded in the inner hole of the axial magnetic bearing. Press downward with both hands on the upper surfaces of the third tooling and the axial magnetic bearing until the axial magnetic bearing contacts the upper surface of the first tooling. Remove the first tooling, and the first tooling deforms along the tooling opening and disengages from the rotor, thereby installing the axial magnetic bearing on the front bearing housing; then remove the third tooling.

[0017] (S4) Install the other radial magnetic bearing into the rear bearing housing, and assemble the rear bearing housing and the motor stator together; then turn the rotor and front bearing housing assembly assembled in the above steps around and lift it above the motor stator, and align the center of the rotor with the center of the motor stator.

[0018] (S5) Extend the fourth tooling upward along the rotor hole positions of the rear bearing housing and the motor stator until it contacts the lower end of the rotor, and the inner surface of the positioning groove matches the outer surface of the rotor; then slowly lower the rotor and front bearing housing assembly. During this process, the fourth tooling always remains in contact with the rotor until the front bearing housing completely drops and contacts the upper surface of the motor stator.

[0019] (S6) Remove the fourth tooling, and fix the front bearing housing to the motor stator to complete the assembly process of the magnetic levitation motor.

[0020] Preferably, threaded holes are provided on the upper end face of the rotor. When lifting the rotor and the front bearing seat assembly, first screw and fix a lifting ring in the threaded hole on the upper end face of the rotor, and then use a crane to lift the rotor and the front bearing seat assembly by lifting the lifting ring.

[0021] The advantages of a magnetic levitation motor assembly tooling, a motor and an assembly method adopting the above technical solutions of the present invention are as follows:

[0022] When assembling the rotor and the front bearing seat assembly, first use the fourth tooling to extend upward along the rotor hole positions of the rear bearing seat and the motor stator until it contacts the lower end of the rotor, and the inner surface of the positioning groove is matched with the outer surface of the rotor. And through the cooperation between the positioning groove and the lower end of the rotor, its left and right movement is prevented, and the rotor is prevented from colliding and rubbing with the motor stator due to magnetic force, resulting in damage to the rotor surface. At the same time, when assembling the axial magnetic bearing, place the second tooling on the upper surface of the front bearing seat; then respectively sleeved the upper axial magnetic bearing and the third tooling on the outer wall of the rotor, the third tooling is located above the axial magnetic bearing, and the outer wall of the tooling boss is embedded in the inner hole of the axial magnetic bearing; press down with both hands against the upper surfaces of the third tooling and the axial magnetic bearing until the axial magnetic bearing contacts the upper surface of the first tooling; remove the first tooling, and the first tooling deforms along the tooling opening and disengages from the rotor, thereby installing the axial magnetic bearing on the front bearing seat; that is, in this way, a tooling boss is provided between the inner hole of the axial magnetic bearing and the outer wall of the rotor to prevent the axial magnetic bearing from colliding with the outer wall of the rotor, and a fourth tooling made of sponge material is provided below the axial magnetic bearing to prevent the axial magnetic bearing from suddenly falling due to the attraction force, causing injury to workers and damage to the axial magnetic bearing. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram for assembling the axial magnetic bearing.

[0024] Figure 2 It is a schematic structural diagram for assembling the rotor and the front bearing seat assembly.

[0025] Figure 3 It is a schematic structural diagram of the first tooling.

[0026] Figure 4 、 Figure 5 It is a schematic structural diagram of the second tooling.

[0027] Figure 6 It is a schematic structural diagram of the third tooling.

[0028] Figure 7 It is a schematic structural diagram of the fourth tooling.

[0029] 6 - Lifting ring. Detailed Embodiments

[0030] The following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings.

[0031] Embodiment 1

[0032] As Figure 1-7 shown, a magnetic levitation motor assembly tooling, which includes a first tooling 1, a second tooling 2, a third tooling 3, and a fourth tooling 4; the first tooling 1 is provided with a support surface 11 and a first hole 12, the support surface 11 is used to fit and support the end face of the front bearing seat, and the first hole 12 is used to accommodate the part of the rotor extending out of the front bearing seat at the front end; the second tooling 2 is provided with a second hole 21 and a tooling opening 22 arranged radially, the second hole 21 is used to be sleeved on the outer wall of the rotor, the second tooling 2 is divided into two non-connected parts at the position of the tooling opening 22, and the material of the second tooling 2 is sponge; the third tooling 3 is provided with a tooling boss 31, and the tooling boss 31 is provided with a boss inner hole 32 penetrating axially; the boss inner hole 32 is used to be sleeved on the outer wall of the rotor, and the outer wall of the tooling boss 31 is used to be embedded in the inner hole of the axial magnetic bearing; the outer surface of the fourth tooling 4 is used to cooperate with the rear bearing seat and the rotor hole of the motor stator, and the fourth tooling 4 is provided with a positioning groove 41, and the inner surface of the positioning groove 41 cooperates with the outer surface of the rear end of the rotor. In this way, when assembling the rotor and the front bearing seat assembly, first use the fourth tooling 4 to extend upward along the rotor hole of the rear bearing seat and the motor stator until it contacts the lower end of the rotor, and the inner surface of the positioning groove 41 cooperates with the outer surface of the rotor; and through the cooperation between the positioning groove 41 and the lower end of the rotor, it is further prevented from moving left and right, avoiding the rotor from colliding and rubbing with the motor stator due to magnetic force and causing damage to the rotor surface. At the same time, when assembling the axial magnetic bearing, place the second tooling 2 on the upper surface of the front bearing seat; then respectively sleeve the upper axial magnetic bearing and the third tooling 3 on the outer wall of the rotor, the third tooling 3 is located above the axial magnetic bearing, and the outer wall of the tooling boss 31 is embedded in the inner hole of the axial magnetic bearing; press down with both hands against the upper surfaces of the third tooling 3 and the axial magnetic bearing until the axial magnetic bearing contacts the upper surface of the first tooling 1; remove the first tooling 1, and the first tooling 1 deforms and disengages from the rotor along the tooling opening 22, thereby installing the axial magnetic bearing on the front bearing seat; that is, in this way, a tooling boss is provided between the inner hole of the axial magnetic bearing and the outer wall of the rotor to prevent the axial magnetic bearing from colliding with the outer wall of the rotor, and a fourth tooling made of sponge material is provided below the axial magnetic bearing to prevent the axial magnetic bearing from suddenly falling due to the attraction force, causing injury to workers and damage to the axial magnetic bearing.

[0033] The material of the first tooling 1 is aluminum alloy. The material of the third tooling 3 is aluminum alloy. The material of the fourth tooling 4 is hard rubber.

[0034] The diameter of the first hole 12 is larger than the diameter of the part of the rotor extending out of the front bearing seat at the front end so that the part of the rotor extending out of the front bearing seat at the front end can quickly extend into the first hole 12.

[0035] There is a gap between the inner hole 32 of the boss and the outer wall of the rotor to avoid large friction with the outer wall of the rotor when pressing down the axial magnetic bearing, thus ensuring that the axial magnetic bearing can be quickly pressed down. The height of the tooling boss 31 is less than the axial length of the inner hole of the axial magnetic bearing.

[0036] A magnetic levitation motor assembled by using the described assembly tooling. The motor includes a front bearing seat 51, a rotor 52, a thrust disc 53, an axial spacer 54, an axial magnetic bearing 55, a radial magnetic bearing 56, a rear bearing seat 57, and a motor stator 58. The front bearing seat 51 and the rear bearing seat 57 are respectively located at the front and rear ends of the motor stator 58. Two axial magnetic bearings 55 and one radial magnetic bearing 56 are both located inside the front bearing seat 51, and the other radial magnetic bearing 56 is located inside the rear bearing seat 57. The thrust disc 53 is fixed on the rotor 52. The axial magnetic bearing 55 and the radial magnetic bearing 56 are both sleeved on the outer wall of the rotor 52, and the two axial magnetic bearings 55 are respectively located at the two axial ends of the thrust disc 53.

[0037] A magnetic levitation motor assembly method for assembling the described magnetic levitation motor, which includes the following steps:

[0038] (S1) After installing a radial magnetic bearing 56 into the front bearing seat 51, place the front bearing seat 51 on the support surface 11 of the first tooling 1, and then install an axial magnetic bearing 55 and the axial spacer 54 in sequence at the corresponding positions on the front bearing seat 51 according to the installation order.

[0039] (S2) Fix the installation of the thrust disc 53 to the rotor 52. Then turn the thrust disc 53 downward, align the center of the rotor 52 with the center hole of the front bearing seat 51, and install the thrust disc 53 onto the front bearing seat 51.

[0040] (S3) Place the second tooling 2 on the upper surface of the front bearing seat 51. Then respectively sleeve another axial magnetic bearing 55 and the third tooling 3 on the outer wall of the rotor 52. The third tooling 3 is located above the axial magnetic bearing 55, and the outer wall of the tooling boss 31 is embedded in the inner hole of the axial magnetic bearing 55. Press downward with both hands against the upper surfaces of the third tooling 3 and the axial magnetic bearing 55 until the axial magnetic bearing 55 contacts the upper surface of the first tooling 1. Remove the first tooling 1, and the first tooling 1 deforms along the tooling opening 22 and disengages from the rotor 52, thereby installing the axial magnetic bearing 55 on the front bearing seat 51. Then remove the third tooling 3.

[0041] (S4) Install the other radial magnetic bearing 56 into the rear bearing seat 57, and assemble the rear bearing seat 57 and the motor stator 58 together. Then turn around the assembled rotor 52 and front bearing seat 51 assembly in the above steps and lift it above the motor stator 58, aligning the center of the rotor 52 with the center of the motor stator 58.

[0042] (S5) Extend the fourth tooling 4 upward along the rotor hole positions of the rear bearing housing 57 and the motor stator 58 until it contacts the lower end of the rotor 52, and the inner surface of the positioning groove 41 is fitted with the outer surface of the rotor; then slowly lower the combination of the rotor 52 and the front bearing housing 51. During this process, the fourth tooling 4 always remains in contact with the rotor 52 until the front bearing housing 51 completely drops and contacts the upper surface of the motor stator 58;

[0043] (S6) Remove the fourth tooling 4 and fix the front bearing housing 51 to the motor stator 58 to complete the assembly process of the magnetic levitation motor.

[0044] The upper end face of the rotor 52 is provided with threaded holes; when lifting the combination of the rotor 52 and the front bearing housing 51, first screw and fix a lifting ring in the threaded holes on the upper end face of the rotor 52, and then use a crane to lift the combination of the rotor 52 and the front bearing housing 51 by lifting the lifting ring. The lifting process of the combination of the rotor 52 and the front bearing housing 51 is realized by screwing the detachable lifting ring with the threaded holes on the upper end face of the rotor 52, without the need to reset fixed lifting rings at other parts of the magnetic levitation motor, optimizing the structure of the magnetic levitation motor.

Claims

1. A method for assembling a magnetic levitation motor, characterized in that The motor includes a front bearing housing (51), a rotor (52), a thrust disk (53), an axial spacer (54), an axial magnetic bearing (55), a radial magnetic bearing (56), a rear bearing housing (57), and a motor stator (58); the front bearing housing (51) and the rear bearing housing (57) are respectively located at the front and rear ends of the motor stator (58), two axial magnetic bearings (55) and one radial magnetic bearing (56) are both located in the front bearing housing (51), and the other radial magnetic bearing (56) is located in the rear bearing housing (57); the thrust disk (53) is fixed on the rotor (52), the axial magnetic bearing (55) and the radial magnetic bearing (56) are both sleeved on the outer wall of the rotor (52), and the two axial magnetic bearings (55) are respectively located at the two axial ends of the thrust disk (53). The assembly tooling for the magnetic levitation motor includes a first tooling (1), a second tooling (2), a third tooling (3), and a fourth tooling (4); the first tooling (1) is provided with a support surface (11) and a first hole position (12), the support surface (11) is used for fitting and supporting the end face of the front bearing housing, and the first hole position (12) is used for accommodating the part of the rotor extending out of the front bearing housing at the front end; the second tooling (2) is provided with a second hole position (21) and a tooling opening (22) arranged radially, the second hole position (21) is used for sleeving on the outer wall of the rotor, the second tooling (2) is divided into two non-connected parts at the position of the tooling opening (22), and the material of the second tooling (2) is sponge; the third tooling (3) is provided with a tooling boss (31), and the tooling boss (31) is provided with a boss inner hole (32) penetrating axially; the boss inner hole (32) is used for sleeving on the outer wall of the rotor, and the outer wall of the tooling boss (31) is used for being embedded in the inner hole of the axial magnetic bearing; the outer surface of the fourth tooling (4) is used for cooperating with the rear bearing housing and the rotor hole position of the motor stator, and the fourth tooling (4) is provided with a positioning groove (41), and the inner surface of the positioning groove (41) cooperates with the outer surface of the rear end of the rotor. The method includes the following steps: (S1) After installing a radial magnetic bearing (56) onto the front bearing housing (51), place the front bearing housing (51) on the support surface (11) of the first tooling (1), and then install an axial magnetic bearing (55) and the axial spacer (54) onto the corresponding positions on the front bearing housing (51) in sequence according to the installation order. (S2) Fix and install the thrust disk (53) onto the rotor (52); then turn the thrust disk (53) downward, align the center of the rotor (52) with the center hole of the front bearing housing (51), and install the thrust disk (53) onto the front bearing housing (51). (S3) Place the second tooling (2) on the upper surface of the front bearing housing (51); then, respectively, slip another axial magnetic bearing (55) and the third tooling (3) over the outer wall of the rotor (52). The third tooling (3) is located above the axial magnetic bearing (55), and the outer wall of the tooling boss (31) is fitted into the inner hole of the axial magnetic bearing (55). Press downwards with both hands against the upper surfaces of the third tooling (3) and the axial magnetic bearing (55) until the axial magnetic bearing (55) contacts the upper surface of the second tooling (2). Remove the second tooling (2), and the second tooling (2) deforms along the tooling opening (22) and disengages from the rotor (52), thereby installing the axial magnetic bearing (55) on the front bearing housing (51); then remove the third tooling (3). (S4) Install another radial magnetic bearing (56) onto the rear bearing housing (57), and assemble the rear bearing housing (57) and the motor stator (58) together; then turn around the rotor (52) and front bearing housing (51) assembly assembled in the above steps and lift it above the motor stator (58), aligning the center of the rotor (52) with the center of the motor stator (58). (S5) Extend the fourth tooling (4) upwards along the rotor hole positions of the rear bearing housing (57) and the motor stator (58) until it contacts the lower end of the rotor (52), and the inner surface of the positioning groove (41) mates with the outer surface of the rotor; then slowly lower the rotor (52) and front bearing housing (51) assembly. During this process, the fourth tooling (4) always remains in contact with the rotor (52) until the front bearing housing (51) completely drops and contacts the upper surface of the motor stator (58). (S6) Remove the fourth tooling (4), and fix the front bearing housing (51) to the motor stator (58) to complete the assembly process of the magnetic levitation motor.

2. The method according to claim 1, characterized in that, The material of the first tooling (1) is aluminum alloy.

3. The method according to claim 1, wherein The material of the third tooling (3) is aluminum alloy.

4. The method according to claim 1, characterized in that The material of the fourth tooling (4) is hard rubber.

5. The method according to claim 1, characterized in that, The diameter of the first hole position (12) is larger than the diameter of the part of the rotor protruding from the front bearing housing at the front end.

6. The method according to claim 1, wherein There is a gap between the inner hole of the boss and the outer wall of the rotor.

7. The method according to claim 1, characterized in that The height of the tooling boss (31) is less than the axial length of the inner hole of the axial magnetic bearing.

8. The method according to claim 1, wherein There are threaded holes provided on the upper end face of the rotor (52); when lifting the rotor (52) and front bearing housing (51) assembly, first screw and fix a lifting ring in the threaded hole on the upper end face of the rotor (52), and then use a crane to lift the rotor (52) and front bearing housing (51) assembly by lifting the lifting ring.

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