Magnetic suspension bearing motor structure

Abstract

The utility model provides a magnetic suspension bearing motor structure, which comprises a motor stator (2) arranged in a shell (1) and a rotor (3) which is arranged in a middle shaft area of the motor stator and is provided with a thrust shaft shoulder (32), and a bearing structure of the rotor comprises a radial magnetic suspension bearing (5) and an axial magnetic suspension bearing (6) which are arranged from inside to outside; the rotor is of an integrated rotating shaft structure formed by assembling and combining a rotating shaft and a permanent magnet, and the thrust shaft shoulders are arranged at the two ends of the integrated rotating shaft structure. In a magnetic circuit of the axial magnetic suspension bearing, the axial magnetic suspension bearing forms an axial magnetic field capable of being coupled with a thrust shaft shoulder of the rotor through a magnetic conducting ring (62) of the axial magnetic suspension bearing, and axial magnetic force is applied to the thrust shaft shoulder, so that the rotor is kept stable in the axial direction during operation; according to the utility model, the design of a magnetic suspension bearing motor without a thrust disc can be realized.

Description

Technical Field

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

[0002] Magnetic levitation bearings typically utilize magnetic force to achieve contactless levitation of the motor rotor. This technology eliminates the mechanical contact found in traditional mechanical bearings, significantly reducing friction and wear while improving system reliability and stability. Its main working principle is based on precisely controlling the strength and distribution of the magnetic field to create a stable magnetic field around the rotor, allowing it to levitate and rotate freely. The magnetic levitation bearing thrust disk is one of the key components in the system. It provides the supporting force to ensure the rotor's axial movement through the electromagnetic force generated by the axial thrust coil, thus maintaining the rotor's stable levitation.

[0003] However, the thrust disk structure increases the wind friction loss (wind friction power consumption) during motor operation and also complicates the motor structure. How to design a magnetic levitation bearing motor structure without a thrust disk is a research direction. Utility Model Content

[0004] This invention proposes a magnetic levitation bearing motor structure that enables the design of a magnetic levitation bearing motor without a thrust disk.

[0005] The present invention adopts the following technical solution.

[0006] A magnetic levitation bearing motor structure includes a motor stator (2) disposed in a housing (1) and a rotor (3) with a thrust shoulder (32) disposed in the central axis region of the electronic stator. The bearing structure of the rotor includes a radial magnetic levitation bearing (5) and an axial magnetic levitation bearing (6) arranged from the inside to the outside.

[0007] The rotor is an integral shaft structure assembled with a rotating shaft and a permanent magnet. The thrust shoulders are located at both ends of the integral shaft structure. In the magnetic circuit of the axial magnetic levitation bearing, the axial magnetic levitation bearing forms an axial magnetic field that can couple with the thrust shoulders of the rotor through its magnetic ring (62), and applies axial magnetic force to the thrust shoulders so that the rotor remains stable in the axial direction during operation.

[0008] No thrust plate structure is provided at the motor structure.

[0009] Both the radial magnetic bearing and the axial magnetic bearing are located at the bearing housing (4).

[0010] The bearing structure also includes an auxiliary bearing (7) located at its outer end.

[0011] The auxiliary bearing end cap (8) of the auxiliary bearing is fixed with end cap fixing bolts (9).

[0012] The magnetic guide ring is located on the inner wall of the axial magnetic levitation bearing base (61) of the axial magnetic levitation bearing, and the magnetic guide ring protrudes from the inner wall of the base.

[0013] The shoulder diameter of the thrust shoulder of the rotor is greater than that of the rotor shaft section (33).

[0014] The vertical surface of the thrust shoulder of the rotor is directly opposite and adjacent to the vertical surface of the magnetic ring of the axial magnetic levitation bearing.

[0015] The operating method of the magnetic levitation bearing motor structure is used in the magnetic levitation bearing motor structure described above. When the motor is running, the magnetic force of the axial magnetic levitation bearing sequentially passes through the axial magnetic levitation bearing base (61), the magnetic guide ring (62), the rotor base (21), the thrust shoulder (32), and the rotor air gap (10) to form a magnetic flux loop. The axial magnetic levitation bearing base acts the axial magnetic force of the axial magnetic levitation bearing on the thrust shoulder of the rotor through the magnetic guide ring of the axial magnetic levitation bearing, so that the rotor remains stable in the axial direction when running.

[0016] An assembly method for a magnetic levitation bearing motor structure, used in the magnetic levitation bearing motor structure described above, includes the following steps;

[0017] Step S1: The housing and the stator of the motor are thermally assembled to form the motor stator housing assembly, and then the rotor and the motor stator housing assembly are assembled to form the main structure of the motor.

[0018] Step S2: The bearing housing assemblies at both ends of the housing consist of bearing housings, radial magnetic levitation bearings, axial magnetic levitation bearings, and auxiliary bearings. First, the radial magnetic levitation bearings and axial magnetic levitation bearings are fixed in the bearing housings by thermal assembly, and then the bearing housing assemblies at both ends are installed into the housing respectively.

[0019] Step S3: Place the auxiliary bearings at both ends of the housing onto the rotor of the motor, so that the rotor can rotate smoothly on the auxiliary bearings;

[0020] Step S4: Fix the auxiliary bearing end cover to the axial magnetic levitation bearing 6 with the end cover fixing bolts. The auxiliary bearing end cover is used to fix the position of the auxiliary bearing to prevent it from changing position due to vibration during operation.

[0021] The present invention proposes a magnetic levitation bearing motor structure. Its thrust-disk-less magnetic levitation bearing design can overcome the limitations of traditional magnetic levitation bearings. It adopts the rotor thrust shoulder output method, which reduces the wind friction of the large thrust disk diameter, improves the safety margin of rotor dynamics, improves the dynamic control performance of high-speed rotation, and enables the radial magnetic bearing and axial magnetic bearing to be easily integrated into one unit, further reducing the overall volume and improving the space utilization of the equipment.

[0022] While maintaining the advantages of the original magnetic levitation bearing design, this utility model simplifies the structure of the magnetic levitation bearing motor by designing the magnetic levitation bearing and motor rotor structure, further improving the stability and applicability of the entire rotating system and opening up more possibilities for its application in high-speed rotating machinery and special environments.

[0023] This invention, through rotor structural design, enables the magnetic circuit of the axial magnetic levitation bearing to generate axial force on the rotor shaft shoulder via the axial magnetic levitation bearing guide ring, thereby eliminating the thrust disc and simplifying the magnetic levitation bearing structure. Furthermore, based on this structural design, the radial magnetic levitation bearing, axial magnetic levitation bearing, and bearing housing are formed into a composite assembly, enabling the installation and production of this magnetic levitation bearing motor structure to be integrated and highly efficient.

[0024] In this invention, the rotor is an integrated shaft structure assembled from a rotating shaft and a permanent magnet, with thrust shoulders designed at both ends; the axial magnetic levitation bearing couples the axial magnetic field to the rotor shoulder through a magnetic guide ring, and applies electromagnetic force to the thrust shoulder, thus replacing the thrust disc structure; correspondingly, the motor stator is assembled in the housing in the form of a heat-fitted sleeve, forming a basic motor structure with the rotor; the radial magnetic levitation bearing and the axial magnetic levitation bearing are fixedly installed in the bearing housing to form a composite component, and the two identical bearing housings are heat-fitted in the housing in the same way, which greatly simplifies the installation of the magnetic levitation bearing.

[0025] The main advantages of this utility model are reflected in the following points;

[0026] 1. Reduced losses: The thrustless structure reduces the windage loss of the thrust disk and improves system efficiency.

[0027] 2. Improve rotor dynamic margin: Removing the thrust disk greatly reduces the rotor outer diameter, increases the critical speed of the overall rotor structure, and makes the rotor dynamic performance more stable.

[0028] 3. Improved dynamic performance of magnetic bearings at high speeds; the absence of a thrust disk simplifies the overall rotor structure and reduces unnecessary external disturbances, thereby improving system response speed and stability. This is particularly important for applications requiring rapid start-stop or acceleration.

[0029] 4. Further improve integration, simplify the structure of the magnetic bearing motor, reduce costs, and improve production efficiency. Attached Figure Description

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0031] Appendix Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model;

[0032] Appendix Figure 2 This is a schematic diagram of the magnetic circuit of a specific embodiment of this utility model;

[0033] In the diagram: 1. Housing; 2. Motor stator; 3. Rotor; 4. Bearing housing; 5. Radial magnetic levitation bearing; 6. Axial magnetic levitation bearing; 7. Auxiliary bearing; 8. Auxiliary bearing end cover; 9. End cover fixing bolt; 10. Rotor air gap; 31. Rotor base; 32. Thrust shoulder; 33. Rotor shaft section; 61. Axial magnetic levitation bearing base; 62. Magnetic guide ring. Detailed Implementation

[0034] As shown in the figure, a magnetic levitation bearing motor structure includes a motor stator 2 housed in a housing 1 and a rotor 3 with a thrust shoulder 32 located in the central axis region of the electronic stator. The bearing structure of the rotor includes a radial magnetic levitation bearing 5 and an axial magnetic levitation bearing 6 arranged from the inside to the outside.

[0035] The rotor is an integral shaft structure assembled with a rotating shaft and a permanent magnet. The thrust shoulders are located at both ends of the integral shaft structure. In the magnetic circuit of the axial magnetic levitation bearing, the axial magnetic levitation bearing forms an axial magnetic field that can couple with the thrust shoulders of the rotor through its magnetic ring 62, and applies axial magnetic force to the thrust shoulders so that the rotor remains stable in the axial direction during operation.

[0036] No thrust plate structure is provided at the motor structure.

[0037] Both the radial magnetic levitation bearing and the axial magnetic levitation bearing are located at bearing housing 4.

[0038] The bearing structure also includes an auxiliary bearing 7 located at its outer end.

[0039] The auxiliary bearing end cover 8 of the auxiliary bearing is fixed by end cover fixing bolts 9.

[0040] The magnetic guide ring is located on the inner wall of the axial magnetic levitation bearing base 61 of the axial magnetic levitation bearing, and the magnetic guide ring protrudes from the inner wall of the base.

[0041] The shoulder diameter of the thrust shoulder of the rotor is greater than that of the rotor shaft segment 33.

[0042] The vertical surface of the thrust shoulder of the rotor is directly opposite and adjacent to the vertical surface of the magnetic ring of the axial magnetic levitation bearing.

[0043] The operating method of the magnetic levitation bearing motor structure is used in the magnetic levitation bearing motor structure described above. When the motor is running, the magnetic force of the axial magnetic levitation bearing sequentially passes through the axial magnetic levitation bearing base 61, the magnetic guide ring 62, the rotor base 21, the thrust shoulder 32, and the rotor air gap 10 to form a magnetic flux loop. The axial magnetic levitation bearing base acts the axial magnetic force of the axial magnetic levitation bearing on the thrust shoulder of the rotor through the magnetic guide ring of the axial magnetic levitation bearing, so that the rotor remains stable in the axial direction when running.

[0044] An assembly method for a magnetic levitation bearing motor structure, used in the magnetic levitation bearing motor structure described above, includes the following steps;

[0045] Step S1: The housing and the stator of the motor are thermally assembled to form the motor stator housing assembly, and then the rotor and the motor stator housing assembly are assembled to form the main structure of the motor.

[0046] Step S2: The bearing housing assemblies at both ends of the housing consist of bearing housings, radial magnetic levitation bearings, axial magnetic levitation bearings, and auxiliary bearings. First, the radial magnetic levitation bearings and axial magnetic levitation bearings are fixed in the bearing housings by thermal assembly, and then the bearing housing assemblies at both ends are installed into the housing respectively.

[0047] Step S3: Place the auxiliary bearings at both ends of the housing onto the rotor of the motor, so that the rotor can rotate smoothly on the auxiliary bearings;

[0048] Step S4: Fix the auxiliary bearing end cover to the axial magnetic levitation bearing 6 with the end cover fixing bolts. The auxiliary bearing end cover is used to fix the position of the auxiliary bearing to prevent it from changing position due to vibration during operation.

[0049] Example:

[0050] Based on the above implementation method, this example proposes a magnetic levitation bearing motor structure without a thrust disk.

[0051] like Figure 1 The figure shows a schematic diagram of a specific embodiment of this utility model. In the figure, the magnetic levitation bearing motor structure consists of a housing 1, a motor stator 2, a rotor 3, a bearing housing 4, a radial magnetic levitation bearing 5, an axial magnetic levitation bearing 6, an auxiliary bearing 7, an auxiliary bearing end cover 8, and end cover fixing bolts 9.

[0052] The housing 1 and the motor stator 2 are thermally assembled to form the motor stator housing assembly, and then the rotor 3 and the motor stator housing assembly are combined to form the basic structure of the motor.

[0053] The bearing housing assemblies at both ends consist of bearing housing 4, radial magnetic levitation bearing 5, axial magnetic levitation bearing 6, and auxiliary bearing 7. The radial magnetic levitation bearing 5 and axial magnetic levitation bearing 6 are fixed in the bearing housing 4 by thermal assembly. Then, the bearing housing assemblies at both ends are respectively installed into the housing 1.

[0054] The auxiliary bearings 7 at both ends are respectively fitted onto the rotor 3, so that the rotor 3 can rotate smoothly on the auxiliary bearings 7.

[0055] The auxiliary bearing end cover 8 is fixed to the axial magnetic levitation bearing 6 by the end cover fixing bolt 9. The auxiliary bearing end cover 8 can fix the position of the auxiliary bearing 7 and prevent the position from changing due to vibration during operation.

[0056] like Figure 2 The diagram shown is a schematic diagram of the magnetic circuit of a specific embodiment of this utility model.

[0057] The axial magnetic bearing base 61 is designed with an axial magnetic bearing guide ring 62, which protrudes from the inner diameter of the axial magnetic bearing base 61.

[0058] The rotor thrust shoulder 32 is 5mm larger in outer diameter than the rotor shaft section 33, and matches the diameter of the magnetic ring 62 of the axial magnetic levitation bearing.

[0059] The axial magnetic levitation bearing base 61, the axial magnetic levitation bearing guide ring 62, the rotor base 31, the rotor thrust shoulder 32, and the rotor air gap 10 together form a magnetic flux loop. The axial magnetic levitation bearing base 61 applies axial magnetic force to the rotor thrust shoulder 32 through the axial magnetic levitation bearing guide ring 62, so that the rotor remains stable in the axial direction during operation.

Claims

1. A magnetic levitation bearing motor structure, characterized in that: It includes a motor stator (2) housed in a housing (1) and a rotor (3) with a thrust shoulder (32) located in the central axis region of the electronic stator. The bearing structure of the rotor includes a radial magnetic levitation bearing (5) and an axial magnetic levitation bearing (6) arranged from the inside to the outside. The rotor is an integral shaft structure assembled with a rotating shaft and a permanent magnet, and the thrust shoulder is located at both ends of the integral shaft structure; in the magnetic circuit of the axial magnetic levitation bearing, the axial magnetic levitation bearing forms an axial magnetic field that can couple with the thrust shoulder of the rotor through its magnetic ring (62).

2. The magnetic levitation bearing motor structure according to claim 1, characterized in that: No thrust plate structure is provided at the motor structure.

3. The magnetic levitation bearing motor structure according to claim 1, characterized in that: Both the radial magnetic bearing and the axial magnetic bearing are located at the bearing housing (4).

4. The magnetic levitation bearing motor structure according to claim 1, characterized in that: The bearing structure also includes an auxiliary bearing (7) located at its outer end.

5. The magnetic levitation bearing motor structure according to claim 4, characterized in that: The auxiliary bearing end cap (8) of the auxiliary bearing is fixed with end cap fixing bolts (9).

6. The magnetic levitation bearing motor structure according to claim 1, characterized in that: The magnetic guide ring is located on the inner wall of the axial magnetic levitation bearing base (61) of the axial magnetic levitation bearing, and the magnetic guide ring protrudes from the inner wall of the base.

7. The magnetic levitation bearing motor structure according to claim 1, characterized in that: The axial magnetic bearing applies axial magnetic force to the thrust shoulder to keep the rotor stable in the axial direction during operation.

8. The magnetic levitation bearing motor structure according to claim 1, characterized in that: The shoulder diameter of the thrust shoulder of the rotor is greater than that of the rotor shaft section (33).

9. The magnetic levitation bearing motor structure according to claim 8, characterized in that: The vertical surface of the thrust shoulder of the rotor is directly opposite the vertical surface of the magnetic ring of the axial magnetic levitation bearing.

10. A magnetic levitation bearing motor structure according to claim 8, characterized in that: The vertical surface of the thrust shoulder of the rotor is adjacent to the vertical surface of the magnetic ring of the axial magnetic levitation bearing.

Images