Magnetic suspension motor with gap protection structure

Abstract

The utility model belongs to the technical field of magnetic suspension motors, and discloses a magnetic suspension motor with a gap protection structure, which comprises a casing and a rotor, an axial magnetic bearing assembly, an inner side auxiliary bearing, an outer side auxiliary bearing and a thrust disc are mounted in the casing, and the magnetic suspension motor further comprises a gap protection assembly. The clearance protection assembly comprises a first protection copper piece, a second protection copper piece and a third protection copper piece, the first protection copper piece is embedded in an axial clearance existing between the axial magnetic bearing assembly and the thrust disc, and the second protection copper piece is arranged in a fit clearance existing between the left end of the auxiliary bearing seat and the inner side auxiliary bearing; the third protection copper piece is positioned in a fit clearance between the right end of the auxiliary bearing seat and the inner ring cover of the shell; according to the utility model, the copper piece is arranged in the gap to effectively maintain the gap for a long time, so that the service life of the motor is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of magnetic levitation motor technology, and in particular to a magnetic levitation motor with a gap protection structure. Background Technology

[0002] The three common motor clearances refer to the clearances between the two sides of the motor rotor thrust disc and the axial magnetic bearing assembly, the clearance between the inner auxiliary bearing and the shaft shoulder, and the clearance between the outer auxiliary bearing and the inner ring cover of the housing. These three motor clearances have an extremely important impact on the stability of the motor.

[0003] The motor rotor can move axially during operation, which can prevent the machine from operating normally. To address this, a common method is to install adjusting rings or shims made of 45# steel with a certain thickness at the three clearance positions to ensure that the motor's three clearances are within the correct range.

[0004] Although 45# has high strength, its surface hardness is relatively low and its wear resistance is not outstanding. It cannot maintain the dimensions of the three gaps stably, which will result in a relatively short service life of the motor. Utility Model Content

[0005] The main technical problem to be solved by this utility model is to provide a magnetic levitation motor with a gap protection structure. Since copper alloy has the advantages of effectively reducing friction damage and protecting mating workpieces, the gap can be effectively maintained for a long time by setting copper parts in the gap, thus extending the service life of the motor.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] A magnetic levitation motor with a gap protection structure includes a housing and a rotor. The housing is equipped with an axial magnetic bearing assembly, an auxiliary bearing seat, an inner auxiliary bearing, an outer auxiliary bearing, and a thrust disk. It also includes a gap protection assembly, which includes a first protective copper component, a second protective copper component, and a third protective copper component.

[0008] The first protective copper component is nested within the axial gap between the axial magnetic bearing assembly and the thrust disk;

[0009] The second protective copper component is installed in the mating clearance between the left end of the auxiliary bearing housing and the inner auxiliary bearing;

[0010] The third protective copper component is positioned within the mating gap between the right end of the auxiliary bearing seat and the inner ring cover of the housing.

[0011] The following are further optimizations of the above technical solution by this utility model:

[0012] The first protective copper component is a copper sleeve with a ring-shaped structure.

[0013] Further optimization: The inner diameter of the first protective copper part matches the outer diameter of the thrust disk, and the outer wall of the first protective copper part fits against the end face of the axial magnetic bearing assembly.

[0014] Further optimization: The second protective copper component is a copper sleeve with a ring-shaped structure.

[0015] Further optimization: One end face of the second protective copper part is tightly abutted against the side of the inner auxiliary bearing facing the rotor shaft shoulder, and the other end face of the second protective copper part is tightly attached to the left end of the auxiliary bearing seat.

[0016] Further optimization: The third protective copper component is a plate-shaped copper cover.

[0017] Further optimization: The third protective copper component is pressed against the right end of the auxiliary bearing seat and the outer auxiliary bearing.

[0018] Further optimization: The first protective copper component, the second protective copper component, and the third protective copper component are gap protection components made of copper or copper alloy materials.

[0019] The present invention adopts the above technical solution and has the following beneficial effects:

[0020] The original gap adjustment ring or adjustment cover inside the three gaps of the motor is replaced by a first protective copper component, a second protective copper component, and a third protective copper component. Due to the high wear resistance, good thermal conductivity and corrosion resistance of copper components, the first protective copper component, the second protective copper component, and the third protective copper component can maintain a long service life in harsh working environments. This solves the problem that the three gaps of the motor cannot be effectively maintained for a long time, and enables the three gaps of the motor to maintain the correct size for a long time. This improves the stability of operation, ensures the efficient operation of the motor, and effectively extends the service life of the motor. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present utility model;

[0023] Figure 2 for Figure 1 Enlarged view of the structure at point A in the middle;

[0024] Figure 3 for Figure 1Enlarged view of the structure at point B.

[0025] In the diagram: 1. Housing; 2. Rotor; 3. Axial magnetic bearing assembly; 4. Auxiliary bearing housing; 5. Inner auxiliary bearing; 6. Outer auxiliary bearing; 7. Thrust disc; 8. First protective copper component; 9. Second protective copper component; 10. Third protective copper component. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figures 1-3 As shown in the figure, a magnetic levitation motor with a gap protection structure includes a housing 1 and a rotor 2. An axial magnetic bearing assembly 3, an auxiliary bearing seat 4, an inner auxiliary bearing 5, an outer auxiliary bearing 6, and a thrust disk 7 are installed inside the housing 1.

[0028] In this embodiment, the installation positions, installation relationships, installation principles, and working principles of the rotor 2, axial magnetic bearing assembly 3, auxiliary bearing seat 4, inner auxiliary bearing 5, outer auxiliary bearing 6, thrust disk 7, and housing 1, as well as the other components, are all existing technologies and are well known to those skilled in the art, and will not be described in detail here.

[0029] In this embodiment, the other structures and working principles of the magnetic levitation motor are all existing technologies and are well known to those skilled in the art, and will not be described in detail here.

[0030] A magnetic levitation motor with a gap protection structure also includes a gap protection component, which includes a first protective copper component 8, a second protective copper component 9, and a third protective copper component 10.

[0031] like Figure 1 and Figure 2 As shown, the first protective copper component 8 is nested within the axial gap between the axial magnetic bearing assembly 3 and the thrust disk 7.

[0032] In this embodiment, the axial magnetic bearing assembly 3 includes a left axial magnetic bearing and a right axial magnetic bearing symmetrically arranged on both sides of the thrust disk 7. The first protective copper part 8 is disposed between the left axial magnetic bearing and the right axial magnetic bearing, and its two end faces press against the end faces of the left axial magnetic bearing and the right axial magnetic bearing respectively, and its inner wall presses against the outer peripheral wall of the thrust disk 7.

[0033] In the magnetic levitation motor, the thrust disk 7 is suspended in the magnetic field generated by the axial magnetic bearing assembly 3, and a certain gap (i.e. the aforementioned axial gap) needs to be maintained between the two sides of the thrust disk 7 and the axial magnetic bearing assembly 3.

[0034] In this embodiment, the structure and principle of the axial magnetic bearing assembly 3 are both existing technologies and are well known to those skilled in the art, and will not be described in detail here.

[0035] The first protective copper component 8 is a copper sleeve with a ring-shaped structure.

[0036] The inner diameter of the first protective copper part 8 matches the outer diameter of the thrust disk 7, and the outer wall of the first protective copper part 8 is in contact with the end face of the axial magnetic bearing assembly 3.

[0037] In this embodiment, the first protective copper part 8 is fixed in the axial gap instead of the original gap adjustment ring made of 45#, which can reduce friction and wear, and at the same time protect the thrust plate, ensuring the axial stability of the motor and the reliability of the suspension performance.

[0038] like Figure 1 and Figure 3 As shown, the second protective copper component 9 is disposed within the mating gap between the left end of the auxiliary bearing seat 4 and the inner auxiliary bearing 5.

[0039] In this embodiment, both the inner auxiliary bearing 5 and the outer auxiliary bearing 6 serve as backup support and protection in the motor.

[0040] When the magnetic levitation system malfunctions or the rotor 2 experiences abnormal axial displacement, the inner auxiliary bearing 5 and the outer auxiliary bearing 6 will come into contact with the rotor 2 to prevent the rotor 2 from colliding with other components.

[0041] The second protective copper component 9 is a copper sleeve with a ring-shaped structure.

[0042] One end face of the second protective copper part 9 is tightly abutted against the side of the inner auxiliary bearing 5 facing the shoulder of the rotor 2, and the other end face of the second protective copper part 9 is tightly attached to the left end of the auxiliary bearing seat 4.

[0043] In this embodiment, there is a fitting clearance between the left end of the auxiliary bearing housing 4 and the inner auxiliary bearing 5. The second protective universal component 9 is placed in this fitting clearance to replace the original adjustment ring made of 45#. This not only effectively reduces the friction of the rotor 2 during operation and extends the service life of the motor, but also improves the wear resistance and ensures the long-term effective maintenance of the fitting clearance.

[0044] like Figure 1 and Figure 3As shown, the third protective copper component 10 is positioned within the mating gap between the right end of the auxiliary bearing seat 4 and the inner ring cover (not shown in the figure) of the housing 1.

[0045] The third protective copper component 10 is a plate-shaped copper cover.

[0046] The third protective copper component 10 is pressed against the right end of the auxiliary bearing seat 4 and the outer auxiliary bearing 6.

[0047] In this embodiment, there needs to be a certain distance between the outer auxiliary bearing 6 and the inner ring cover of the housing 1. This distance needs to be large enough to allow the rotor 2 to have a certain axial floating space under normal working conditions, while it also needs to be small enough to ensure that the outer auxiliary bearing 6 can contact the rotor 2 in time to play a protective role when the rotor 2 experiences abnormal axial displacement.

[0048] The original adjustment cover made of 45# was replaced with a third protective copper part 10, which improved the wear resistance of the gap protection part, reduced the occurrence of damage to the rotor 2 due to axial floating, and extended the service life of the gap protection part.

[0049] The first protective copper component 8, the second protective copper component 9, and the third protective copper component 10 are gap protection components made of copper or copper alloy materials.

[0050] In this embodiment, the first protective copper component 8, the second protective copper component 9, and the third protective copper component 10 can all be copper bushings used for flywheel protection bearings, thus maximizing the utilization of materials.

[0051] Compared to the gap protection parts made of 45# steel in the prior art, the copper parts made of copper alloy in this invention have moderate hardness, good toughness and fatigue resistance, high wear resistance, excellent thermal conductivity and corrosion resistance, effectively reducing wear caused by friction during long-term use, thus effectively maintaining the correct size of the three gaps over a long period of time, thereby improving the high efficiency and stability of motor operation and effectively extending the service life of the motor.

[0052] In this embodiment, the dimensions and thicknesses of the first protective copper component 8, the second protective copper component 9, and the third protective copper component 10 can be measured and produced according to actual operation. The measurement methods and installation principles are all existing technologies and are well known to those skilled in the art, so they will not be described in detail here.

[0053] The protective copper component used in this invention is not limited to magnetic levitation motors, but can also be applied to other motors with the aforementioned three gaps.

[0054] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A magnetic levitation motor with a gap protection structure, comprising a housing (1) and a rotor (2), wherein an axial magnetic bearing assembly (3), an auxiliary bearing seat (4), an inner auxiliary bearing (5), an outer auxiliary bearing (6), and a thrust disk (7) are installed inside the housing (1), characterized in that, It also includes a gap protection component, which includes a first protective copper component (8), a second protective copper component (9) and a third protective copper component (10). The first protective copper component (8) is nested in the axial gap between the axial magnetic bearing assembly (3) and the thrust disk (7); The second protective copper part (9) is disposed in the fitting gap between the left end of the auxiliary bearing seat (4) and the inner auxiliary bearing (5); The third protective copper part (10) is positioned within the fitting gap between the right end of the auxiliary bearing seat (4) and the inner ring cover of the housing (1).

2. The magnetic levitation motor with a gap protection structure according to claim 1, characterized in that, The first protective copper component (8) is a copper sleeve with a ring-shaped structure.

3. The magnetic levitation motor with a gap protection structure according to claim 2, characterized in that, The inner diameter of the first protective copper part (8) matches the outer diameter of the thrust disk (7), and the outer wall of the first protective copper part (8) is in contact with the end face of the axial magnetic bearing assembly (3).

4. The magnetic levitation motor with a gap protection structure according to claim 1, characterized in that, The second protective copper component (9) is a copper sleeve with a ring-shaped structure.

5. The magnetic levitation motor with a gap protection structure according to claim 4, characterized in that, One end face of the second protective copper part (9) is closely abutted against the inner auxiliary bearing (5) on the side facing the rotor (2) shaft shoulder, and the other end face of the second protective copper part (9) is close to the left end of the auxiliary bearing seat (4).

6. The magnetic levitation motor with a gap protection structure according to claim 1, characterized in that, The third protective copper component (10) is a plate-shaped copper cover.

7. The magnetic levitation motor with a gap protection structure according to claim 6, characterized in that, The third protective copper part (10) is pressed against the right end of the auxiliary bearing seat (4) and the outer auxiliary bearing (6).

8. The magnetic levitation motor with a gap protection structure according to any one of claims 1-6, characterized in that, The first protective copper part (8), the second protective copper part (9) and the third protective copper part (10) are gap protection parts made of copper alloy material.

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