Installation method of magnetic suspension motor with rear-mounted thrust disc

Abstract

The invention discloses an installation method of a magnetic suspension motor with a rear-mounted thrust disc. The installation method comprises the steps that the magnetic suspension motor is arranged on a rotating table position; a first magnetic bearing seat, a first protective bearing and a first bearing pressing plate are arranged at the front end of the motor barrel; a transition flange is arranged at the front end of the second magnetic bearing seat, and a second magnetic bearing seat, a thrust space ring and a first thrust bearing are arranged at the rear end of the second magnetic bearing seat; penetrating the main shaft into the motor barrel by using a hoisting device; a traction guide rod penetrates into the motor barrel in the vertical direction, so that the traction guide rod is in clearance fit with the main shaft; through cooperation of the hoisting device and the traction guide rod, the main shaft moves towards the front end of the motor barrel; the spacing ring and the second thrust bearing are arranged at the rear end of the first thrust bearing; removing the transition flange; the rear end of the motor barrel is sequentially provided with an adapter column, a protection bearing flange, a second protection bearing, a second bearing and a locking nut. Through the arrangement, the mounting efficiency of the magnetic suspension motor is higher, and the spindle and other parts of the motor are better protected.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic suspension motors, and in particular to an installation method of a magnetic suspension motor with a rear thrust plate. Background Art

[0002] With the advancement of production technology, magnetic levitation motors are widely used in products such as wind turbines, high-precision machine tools and magnetic levitation trains due to their high energy-saving efficiency, high operating speed, long service life and low noise.

[0003] The magnetic levitation motor generally has a blower head at the front end to cool the motor, so the thrust plate needs to be placed at the rear to balance the weight of the motor. In the prior art, when installing the motor spindle, a lifting device is usually used directly to pass the spindle through the magnetic bearing seat at the end of the motor barrel and install it to the motor to improve the installation efficiency of the motor. However, a strong magnetic area is generally provided on the spindle, and the main material of the magnetic bearing is iron. When the spindle passes through the magnetic bearing, the strong magnetic area is easily adsorbed to the magnetic bearing, causing the spindle to deviate from the installation direction and collide with other equipment in the motor, causing wear on the spindle and the equipment in the motor. At the same time, if the spindle is installed directly using a lifting device, the lower end of the spindle is prone to shaking, and it cannot be aligned with the rotor through hole at the front end of the motor, making it difficult to lead the spindle out of the motor barrel, thereby affecting the installation efficiency of the spindle. Summary of the invention

[0004] In order to address the deficiencies of the prior art, the purpose of the present invention is to provide an installation method for a magnetic levitation motor with a rear thrust plate, which can prevent the main shaft from being adsorbed to the magnetic bearing at the rear end of the motor during the assembly process, and at the same time can guide the main shaft to pass through the rotor through hole at the front end of the motor, thereby improving the installation efficiency of the motor.

[0005] Based on the above purpose, the present invention adopts the following technical solution: A method for installing a magnetic levitation motor with a thrust plate at the rear, the magnetic levitation motor comprising: a motor barrel, a motor foot arranged on the circumferential surface of the motor barrel, a motor stator arranged around the inner wall of the motor barrel, a first magnetic bearing assembly arranged at the front end of the motor barrel, a second magnetic bearing assembly arranged at the rear end of the motor barrel, and a main shaft with a thrust plate at the rear end; the first magnetic bearing assembly comprises a first magnetic bearing seat, a first rotor bearing arranged in the first magnetic bearing seat, a first protective bearing, and a first bearing pressure plate; the second magnetic bearing assembly comprises a second magnetic bearing seat, a second rotor bearing arranged in the second magnetic bearing seat, a transition flange, a thrust spacer, a first thrust bearing, a spacing spacer, a second thrust bearing, a second bearing pressure plate, a second protective bearing, a locking nut, a protective bearing flange, and an adapter column; the installation tool of the magnetic levitation motor comprises a hoisting device and a traction guide rod; The installation method specifically includes the following steps: S1. Fix the motor barrel on a rotating platform perpendicular to the horizontal plane through the motor feet, and set the front end of the magnetic levitation motor upward; S2, installing the first magnetic bearing seat to the front end of the motor barrel, and sequentially installing the first protective bearing and the first bearing pressure plate to the front end of the first magnetic bearing seat; S3, rotating the rotating platform 180 degrees, so that the rear end of the magnetic suspension motor is set upward; S4. Install the transition flange to the front end of the second magnetic bearing seat and fasten it with bolts; install the second magnetic bearing seat to the rear end of the motor barrel and fasten it with bolts; S5, installing the thrust spacer to the rear end of the second magnetic bearing seat; installing the first thrust bearing to the rear end of the thrust spacer, and fastening it with bolts; S6. Use a lifting device to vertically pass the main shaft from the middle of the first thrust bearing downward into the interior of the motor barrel; S7. When the main shaft passes through the transition flange, the pulling guide rod is passed upward from the middle of the first bearing pressure plate to the inside of the motor barrel in the vertical direction, so that the pulling guide rod and the main shaft are matched with each other; the main shaft moves toward the front end of the motor barrel through the cooperation of the lifting device and the pulling guide rod; S8, when the thrust plate abuts against the rear end of the first thrust bearing, the bolts used to fasten the first thrust bearing and the thrust spacer in step S5 are removed, the spacing spacer and the second thrust bearing are sequentially installed to the rear end of the first thrust bearing, and the first thrust bearing, the spacing spacer and the second thrust bearing are locked to the thrust spacer by bolts; S9, remove the bolts used to fasten the second magnetic bearing seat and the motor barrel in step S4, and use a lifting device in conjunction with a pulling guide rod to lift the second magnetic bearing seat, the first thrust bearing, the second thrust bearing, the spacing ring, the thrust ring, the transition flange, and the main shaft away from the motor barrel; S10, removing the transition flange from the second magnetic bearing seat; S11, using a lifting device in conjunction with a pulling guide rod to install the second magnetic bearing seat, the first thrust bearing, the second thrust bearing, the spacing ring, the thrust ring and the main shaft back into the motor barrel; S12. Install the adapter column to the rear end of the motor barrel; install the protective bearing flange into the adapter column and fix it with bolts; install the second protective bearing between the protective bearing flange and the main shaft; install the second bearing pressure plate to the rear end of the second protective bearing; put the locking nut on the main shaft to make the locking nut fit tightly with the second protective bearing.

[0006] Furthermore, step S2 also includes: when the first bearing pressure plate is installed, detecting the gap H1 between the first magnetic bearing seat and the first bearing pressure plate, and determining whether the gap H1 is greater than a preset gap threshold; if so, disassembling the first protective bearing and the first bearing pressure plate and reinstalling them to the first magnetic bearing seat; otherwise, proceeding to the next installation operation.

[0007] Furthermore, the gap threshold is set to 0.5 mm.

[0008] Furthermore, a first rotor through hole is provided in the middle of the second rotor bearing, and a second rotor through hole is provided in the middle of the transition flange; a difference D1 between a diameter of the first rotor through hole and a diameter of the main shaft is greater than or equal to 0.48 mm and less than or equal to 0.72 mm; a difference D2 between a diameter of the second rotor through hole and a diameter of the main shaft is greater than or equal to 0.24 mm and less than or equal to 0.36 mm.

[0009] Furthermore, a boss 201 is provided at the rear end of the pulling guide rod, and a groove 161 is provided at the front end of the main shaft; the boss 201 can be arranged in the groove 161 and is loosely matched with the groove 161 .

[0010] Furthermore, a difference D3 between an inner diameter of the first protective bearing and a diameter of the traction guide rod is greater than or equal to 0.24 mm and less than or equal to 0.36 mm.

[0011] Furthermore, step S12 also includes, when the second bearing pressure plate is installed, detecting the gap H2 between the protective bearing flange and the second bearing pressure plate, and determining whether the gap H2 is greater than a preset gap threshold. If so, the second protective bearing and the second bearing pressure plate are disassembled and reinstalled to the protective bearing flange; otherwise, the assembly process of the magnetic levitation motor is completed.

[0012] The present invention provides an installation method for a magnetic levitation motor with a rear thrust plate, wherein a transition flange is arranged at the front end of a second magnetic bearing seat, and when the main shaft passes through the transition flange, the transition flange can limit the movement of the main shaft in the radial direction, thereby preventing the main shaft from deviating from the original installation route, reducing the possibility of the main shaft touching other parts of the motor during the installation process, and protecting the main shaft and other parts in the motor. At the same time, when the main shaft is disassembled and assembled, a traction guide rod arranged at the lower end of the main shaft can prevent the main shaft from shaking, making it easier for the main shaft to pass through the motor from the middle of the first magnetic bearing assembly, thereby improving the assembly efficiency of the motor, further reducing the possibility of the main shaft touching other parts of the motor, and improving the safety of the installation of the magnetic levitation motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a structural schematic diagram of a magnetic levitation motor provided according to the present invention; Figure 2 is a cross-sectional view of a magnetic levitation motor provided according to the present invention; Figure 3 yes Figure 2 The enlarged view of point A in the middle; Figure 4 yes Figure 2 The enlarged view of point B in the middle; Figure 5 It is a schematic diagram of assembling a magnetic levitation motor using a traction guide rod according to the present invention; Figure 6 yes Figure 5 Enlarged view of point C in the middle; Figure 7 is a cross-sectional view of a second magnetic bearing assembly provided according to the present invention; Figure 8 is an assembly schematic diagram of a first magnetic bearing assembly provided according to the present invention; Fig. 9 yes Figure 8 Enlarged view of point D in the middle. DETAILED DESCRIPTION

[0014] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] like Figure 1 and Figure 2 As shown, the present embodiment provides a magnetic levitation motor with a rear thrust plate. The magnetic levitation motor includes a motor barrel 11, a motor foot 12, a motor stator 13, a first magnetic bearing assembly 14, a second magnetic bearing assembly 15 and a main shaft 16. Specifically, the motor foot 12 is arranged on the circumferential surface of the motor barrel 11, and is used to fix the motor barrel 11. The motor stator 13 is arranged around the inner wall of the motor barrel 11. The first magnetic bearing assembly 14 is arranged at the front end of the motor barrel 11, and the second magnetic bearing assembly 15 is arranged at the rear end of the motor barrel 11. A thrust plate 17 is provided at the rear end of the main shaft 16, and the thrust plate 17 is used to limit the movement of the main shaft 16 along the axial direction of the motor barrel 11, thereby improving the stability of the magnetic levitation motor structure. The main shaft 16 passes through the middle of the second magnetic bearing assembly 15 to the motor barrel 11, passes through the middle of the first magnetic bearing assembly 14, and is fixed at both ends by the first magnetic bearing assembly 14 and the second magnetic bearing assembly 15, respectively. In order to clearly illustrate the technical solution of the present invention, it is also defined as follows Figure 2 Front and rear sides shown.

[0016] like Figure 2As shown, the first magnetic bearing assembly 14 includes a first magnetic bearing seat 141, a first rotor bearing 142, a first protective bearing 143 and a first bearing pressure plate 144. Among them, the first rotor bearing 142 is at least partially arranged in the first magnetic bearing seat 141, and is used to support the front end of the main shaft 16. The first protective bearing 143 and the first bearing pressure plate 144 are sequentially installed to the front end of the first magnetic bearing seat 141. Specifically, the first protective bearing 143 is pressed onto the front side of the first rotor bearing 142. When the magnetic properties of the first rotor bearing 142 fail, the first protective bearing 143 can temporarily support the front end of the main shaft 16 to protect the equipment in the magnetic levitation motor from damage. The first bearing pressure plate 144 is arranged on the front side of the first protective bearing 143, and is used to fasten the first protective bearing 143.

[0017] The second magnetic bearing assembly 15 includes a second magnetic bearing seat 151, a second rotor bearing 152, a transition flange 153, a thrust spacer 154, a first thrust bearing 155, a spacing spacer 156, a second thrust bearing 157, a second bearing pressure plate 158, a second protective bearing 159, a locking nut 1501, a protective bearing flange 1502 and an adapter column 1503.

[0018] Specifically, the second rotor bearing 152 is at least partially disposed in the second magnetic bearing seat 151, and a first rotor through hole 1521 is provided in the middle for the main shaft 16 to pass through. The transition flange 153 is disposed at the front end of the second rotor bearing 152, and a second rotor through hole 1531 is provided in the middle for the main shaft 16 to pass through. Figure 3 and Figure 4 As shown, the difference D1 between the diameter of the first rotor through hole 1521 and the diameter of the main shaft 16 is greater than or equal to 0.48 mm and less than or equal to 0.72 mm. The difference D2 between the diameter of the second rotor through hole 1531 and the diameter of the main shaft 16 is greater than or equal to 0.24 mm and less than or equal to 0.36 mm. Through the above arrangement, the second rotor bearing 152 and the transition flange 153 can provide sufficient clearance for the main shaft 16 to pass through; at the same time, the movement of the main shaft 16 in the radial direction can be limited to prevent the main shaft 16 from shaking too much during assembly or rotation and touching other components in the magnetic levitation motor, causing wear of the main shaft 16 and / or other components of the magnetic levitation motor. At the same time, the difference D2 between the diameter of the second rotor through hole 1531 and the diameter of the main shaft 16 is smaller than the difference D1 between the diameter of the first rotor through hole 1521 and the diameter of the main shaft 16, so that the second rotor through hole 1531 can limit the movement of the main shaft 16 in the radial direction, thereby preventing the strong magnetic area of ​​the main shaft 16 from being adsorbed to the second rotor bearing 152 when passing through the second rotor bearing 152, causing the main shaft 16 to deviate from the original installation route, causing wear to the main shaft 16 and other components in the magnetic levitation motor, and affecting the installation efficiency of the main shaft 16.

[0019] The first thrust bearing 155 is arranged at the rear side of the second magnetic bearing seat 151, and the thrust spacer 154 is arranged between the first thrust bearing 155 and the second magnetic bearing seat 151. The thrust spacer 154 is used to maintain the specified axial distance between the second magnetic bearing seat 151 and the first thrust bearing 155. The second thrust bearing 157 is installed at the rear side of the first thrust bearing 155. The spacing spacer 156 is arranged between the first thrust bearing 155 and the second thrust bearing 157, and is used to separate the first thrust bearing 155 and the second thrust bearing 157. The first thrust bearing 155 and the second thrust bearing 157 are used to carry the thrust plate 17 on the main shaft 16.

[0020] The adapter column 1503 is fixedly connected to the rear end of the motor barrel 11. The protective bearing flange 1502 is arranged around the inner wall of the adapter column 1503 and is fixedly connected to the adapter column 1503. The second protective bearing 159 is arranged in the middle of the protective bearing flange 1502 and can be sleeved on the main shaft 16 to temporarily support the rear end of the main shaft 16 when the magnetic force of the second rotor bearing 152 fails, so as to protect other components of the magnetic levitation motor. The second bearing pressure plate 158 is arranged on the rear side of the second protective bearing 159 to tighten the second protective bearing 159. The locking nut 1501 is sleeved on the main shaft 16 and fits tightly with the second protective bearing 159 to lock the second protective bearing 159.

[0021] like Figure 5 and Figure 6 As shown, this embodiment also provides an installation tool for a magnetic levitation motor. The installation tool includes a lifting device and a pulling guide rod 200. Among them, the lifting device can lift the main shaft 16 or the second magnetic bearing assembly 15 to disassemble and assemble the main shaft 16 or the second magnetic bearing assembly 15. A boss 201 is provided at the rear end of the pulling guide rod 200, and a groove 161 is provided at the front end of the main shaft 16. The boss 201 can be arranged in the groove 161 and fit with the groove 161 in a clearance. Specifically, the difference D3 between the inner diameter of the first protective bearing 143 and the diameter of the pulling guide rod 200 is greater than or equal to 0.24 mm and less than or equal to 0.36 mm. Through the above-mentioned arrangement, the pulling guide rod 200 can guide the main shaft 16 to pass through the motor barrel 11 from the middle of the first magnetic bearing assembly 14 when the main shaft 16 is installed, so as to prevent the lower end of the main shaft 16 from shaking and touching other components in the magnetic levitation motor, causing wear.

[0022] The present application also provides a method for installing the magnetic levitation motor with the thrust plate placed at the rear, which specifically includes the following steps: S1, fix the motor barrel 11 on a rotating platform perpendicular to the horizontal plane through the motor foot 12, and set the front end of the magnetic levitation motor upward; S2, installing the first magnetic bearing seat 141 to the front end of the motor barrel 11, and sequentially installing the first protective bearing 143 and the first bearing pressure plate 144 to the front end of the first magnetic bearing seat 141; S3, rotating the rotating platform by 180° so that the rear end of the magnetic levitation motor is facing upward; S4, install the transition flange 153 to the front end of the second magnetic bearing seat 151 and fasten it with bolts; install the second magnetic bearing seat 151 to the rear end of the motor barrel 11 and fasten it with bolts; S5, installing the thrust spacer 154 to the rear end of the second magnetic bearing seat 151; installing the first thrust bearing 155 to the rear end of the thrust spacer 154, and fastening them with bolts; S6, using the lifting device to vertically insert the main shaft 16 from the middle of the first thrust bearing 155 downward into the interior of the motor barrel 11; S7. When the main shaft 16 passes through the transition flange 153, the pulling guide rod 200 is passed upward from the middle of the first bearing pressure plate 144 to the inside of the motor barrel 11 in the vertical direction, so that the pulling guide rod 200 and the main shaft 16 are in clearance fit; the main shaft 16 moves toward the front end of the motor barrel 11 through the cooperation of the hoisting device and the pulling guide rod 200; The matching structure between the guide rod 200 and the main shaft 16 is as follows: Figure 5 As shown; S8, when the thrust plate 17 is in contact with the rear end of the first thrust bearing 155, the bolts used to fasten the first thrust bearing 155 and the thrust spacer 154 in step S5 are removed, the spacing spacer 156 and the second thrust bearing 157 are sequentially installed to the rear end of the first thrust bearing 155, and the first thrust bearing 155, the spacing spacer 156 and the second thrust bearing 157 are locked to the thrust spacer 154 by bolts; S9, removing the bolts used to fasten the second magnetic bearing seat 151 and the motor barrel 11 in step S4, and using the lifting device in conjunction with the pulling guide rod 200 to lift the second magnetic bearing seat 151, the first thrust bearing 155, the second thrust bearing 157, the spacing ring 156, the thrust ring 154, the transition flange 153 and the main shaft 16 away from the motor barrel 11; S10, removing the transition flange 153 from the second magnetic bearing seat 151; After the transition flange 153 is removed, the assembly structure of the second magnetic bearing seat 151, the first thrust bearing 155, the second thrust bearing 157, the spacing ring 156, the thrust ring 154, the transition flange 153 and the main shaft 16 is as follows: Figure 7 As shown; S11, using the lifting device in cooperation with the pulling guide rod 200 to install the second magnetic bearing seat 151, the first thrust bearing 155, the second thrust bearing 157, the spacing ring 156, the thrust ring 154 and the main shaft 16 back into the motor barrel 11; S12. Install the adapter column 1503 to the rear end of the motor barrel 11; install the protective bearing flange 1502 into the adapter column 1503 and fix it with bolts; install the second protective bearing 159 between the protective bearing flange 1502 and the main shaft 16; install the second bearing pressure plate 158 to the rear end of the second protective bearing 159; sleeve the locking nut 1501 on the main shaft 16 so that the locking nut 1501 fits tightly with the second protective bearing 159.

[0023] Through the above arrangement, when the main shaft 16 passes through the transition flange 153, the transition flange 153 can limit the movement of the main shaft 16 in the radial direction, thereby preventing the main shaft 16 from deviating from the original installation route, reducing the possibility of the main shaft 16 touching other parts of the motor during the installation process, so as to protect the main shaft 16 and other parts of the magnetic levitation motor. At the same time, when the main shaft 16 is disassembled and assembled, the pulling guide rod 200 arranged at the lower end of the main shaft 16 can prevent the main shaft 16 from shaking, making it easier for the main shaft 16 to pass through the motor from the middle of the second bearing pressure plate 158, thereby improving the installation efficiency of the motor, further reducing the possibility of the main shaft 16 touching other parts of the motor, and improving the safety of the magnetic levitation motor assembly.

[0024] like Figure 8 and Fig. 9 As shown, step S2 also includes: when the first bearing pressure plate 144 is installed, the gap H1 between the first magnetic bearing seat 141 and the first bearing pressure plate 144 is detected, and it is determined whether the gap H1 is greater than the preset gap threshold. If so, the first protective bearing 143 and the first bearing pressure plate 144 are disassembled and reinstalled to the first magnetic bearing seat 141. Otherwise, the next installation operation is performed. Among them, the gap threshold is set to 0.5mm. By detecting the gap D1 between the first protective bearing 143 and the first bearing pressure plate 144, it can be confirmed whether the first protective bearing 143 is pressed into place on the first magnetic bearing seat 141 to ensure the stability of the structure of the first magnetic bearing assembly 14.

[0025] like Fig. 9As shown, step S12 also includes, when the second bearing pressure plate 158 is installed, detecting the gap H2 between the protective bearing flange 1502 and the second bearing pressure plate 158, and determining whether the gap H2 is greater than a preset gap threshold. If so, the second protective bearing 159 and the second bearing pressure plate 158 are disassembled and reinstalled to the protective bearing flange 1502; otherwise, the assembly process of the magnetic levitation motor is completed.

[0026] In summary, the present application provides a magnetic levitation motor with a rear thrust plate 17 and an installation method thereof. During installation, the transition flange 153 is used to limit the movement of the main shaft 16 in the radial direction to prevent the main shaft 16 from deviating from the original installation route, so as to protect the main shaft 16 and other components in the magnetic levitation motor. At the same time, the main shaft 16 and the second magnetic bearing assembly 15 are disassembled and assembled by the lifting device and the pulling guide rod 200, which can prevent the main shaft 16 from shaking during the installation process, thereby improving the installation efficiency and assembly safety of the magnetic levitation motor.

[0027] The above is a description of the embodiments of the present invention. Through the above description of the disclosed embodiments, professionals and technicians in the field can implement or use the present invention. Various modifications to these embodiments will be apparent to professionals and technicians in the field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown in this article, but will conform to the widest range consistent with the principles and novelties disclosed herein.

Claims

1. A method for installing a magnetic levitation motor with a rear thrust plate, characterized in that: The magnetic levitation motor comprises: a motor barrel (11), a motor foot (12) arranged on the circumferential surface of the motor barrel (11), a motor stator (13) arranged around the inner wall of the motor barrel (11), a first magnetic bearing assembly (14) arranged at the front end of the motor barrel (11), a second magnetic bearing assembly (15) arranged at the rear end of the motor barrel (11), and a main shaft (16) with the thrust plate at the rear end; the first magnetic bearing assembly (14) comprises a first magnetic bearing seat (141), a first rotor bearing (142) arranged in the first magnetic bearing seat (141), a first protective bearing (143), and a second magnetic bearing assembly (15) arranged at the rear end of the motor barrel (11). and a first bearing pressure plate (144); the second magnetic bearing assembly (15) comprises a second magnetic bearing seat (151), a second rotor bearing (152) arranged in the second magnetic bearing seat (151), a transition flange (153), a thrust spacer (154), a first thrust bearing (155), a spacing spacer (156), a second thrust bearing (157), a second bearing pressure plate (158), a second protective bearing (159), a locking nut (1501), a protective bearing flange (1502) and an adapter column (1503); the installation tool of the magnetic levitation motor comprises a hoisting device and a traction guide rod (200); The installation method specifically comprises the steps of: S1, fixing the motor barrel (11) on a rotating platform perpendicular to a horizontal plane via the motor foot (12), and arranging the front end of the magnetic levitation motor upward; S2, installing the first magnetic bearing seat (141) to the front end of the motor barrel (11), and sequentially installing the first protective bearing (143) and the first bearing pressure plate (144) to the front end of the first magnetic bearing seat (141); S3, rotating the rotating platform by 180° so that the rear end of the magnetic levitation motor is facing upward; S4, installing the transition flange (153) to the front end of the second magnetic bearing seat (151) and fastening it with bolts; installing the second magnetic bearing seat (151) to the rear end of the motor barrel (11) and fastening it with bolts; S5, installing the thrust spacer (154) to the rear end of the second magnetic bearing seat (151); installing the first thrust bearing (155) to the rear end of the thrust spacer (154), and fastening them with bolts; S6, using the lifting device to pass the main shaft (16) vertically downward from the middle of the first thrust bearing (155) into the interior of the motor barrel (11); S7. When the main shaft (16) passes through the transition flange (153), the traction guide rod (200) is passed upward from the middle of the first bearing pressure plate (144) to the inside of the motor barrel (11) in a vertical direction, so that the traction guide rod (200) and the main shaft (16) are loosely matched; the main shaft (16) is moved toward the front end of the motor barrel (11) by the cooperation of the hoisting device and the traction guide rod (200); S8, when the thrust plate abuts against the rear end of the first thrust bearing (155), the bolts used to fasten the first thrust bearing (155) and the thrust spacer (154) in step S5 are removed, the spacing spacer (156) and the second thrust bearing (157) are sequentially installed to the rear end of the first thrust bearing (155), and the first thrust bearing (155), the spacing spacer (156) and the second thrust bearing (157) are locked to the thrust spacer (154) by bolts; S9, removing the bolts used to fasten the second magnetic bearing seat (151) and the motor barrel (11) in step S4, and using the lifting device in conjunction with the pulling guide rod (200) to lift the second magnetic bearing seat (151), the first thrust bearing (155), the second thrust bearing (157), the spacing ring (156), the thrust ring (154), the transition flange (153), and the main shaft (16) away from the motor barrel (11); S10, removing the transition flange (153) from the second magnetic bearing seat (151); S11, using the lifting device in cooperation with the pulling guide rod (200) to install the second magnetic bearing seat (151), the first thrust bearing (155), the second thrust bearing (157), the spacing ring (156), the thrust ring (154), and the main shaft (16) back into the motor barrel (11); S12, install the adapter column (1503) to the rear end of the motor barrel (11); install the protective bearing flange (1502) into the adapter column (1503) and fix it with bolts; install the second protective bearing (159) between the protective bearing flange (1502) and the main shaft (16); install the second bearing pressure plate (158) to the rear end of the second protective bearing (159); sleeve the locking nut (1501) on the main shaft (16) so that the locking nut (1501) and the second protective bearing (159) are tightly fitted.

2. The method for installing a magnetic suspension thrust plate rear head as claimed in claim 1, characterized in that: The step S2 also includes: when the first bearing pressure plate (144) is installed, detecting the gap H1 between the first magnetic bearing seat (141) and the first bearing pressure plate (144), and judging whether the gap H1 is greater than a preset gap threshold; if so, disassembling the first protective bearing (143) and the first bearing pressure plate (144) and reinstalling them to the first magnetic bearing seat (141); otherwise, proceeding to the next installation operation.

3. The method for installing a magnetic suspension thrust plate rear head as claimed in claim 2, characterized in that: The gap threshold is set to 0.5 mm.

4. The method for installing a magnetic suspension thrust plate rear head as claimed in claim 1, characterized in that: A first rotor through hole (1521) is provided in the middle of the second rotor bearing (152), and a second rotor through hole (1531) is provided in the middle of the transition flange (153); a difference D1 between the diameter of the first rotor through hole (1521) and the diameter of the main shaft (16) is greater than or equal to 0.48 mm and less than or equal to 0.72 mm; and a difference D2 between the diameter of the second rotor through hole (1531) and the diameter of the main shaft (16) is greater than or equal to 0.24 mm and less than or equal to 0.36 mm.

5. The method for installing a magnetic suspension thrust plate rear head as claimed in claim 1, characterized in that: The rear end of the pulling guide rod (200) is provided with a boss (201), and the front end of the main shaft (16) is provided with a groove (161); the boss (201) can be arranged in the groove (161) and is clearance-matched with the groove (161).

6. The method for installing a magnetic suspension thrust plate rear head as claimed in claim 1, characterized in that: A difference D3 between the inner diameter of the first protective bearing (143) and the diameter of the traction guide rod (200) is greater than or equal to 0.24 mm and less than or equal to 0.36 mm.

7. The method for installing a magnetic suspension thrust plate rear head as claimed in claim 1, characterized in that: The step S12 also includes, when the second bearing pressure plate (158) is installed, detecting the gap H2 between the protective bearing flange (1502) and the second bearing pressure plate (158), and determining whether the gap H2 is greater than a preset gap threshold; if so, disassembling the second protective bearing (159) and the second bearing pressure plate (158) and reinstalling them to the protective bearing flange (1502); otherwise, the assembly process of the magnetic levitation motor is completed.

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