Magnetic suspension bearing motor structure and method

Abstract

The invention provides a magnetic suspension bearing motor structure and method, the magnetic suspension bearing motor structure comprises a motor stator (2) arranged in a shell (1) and a rotor (3) which is arranged in a center 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 invention, the design of the magnetic suspension bearing motor without the thrust disc can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a magnetic suspension bearing motor structure and method. Background Art

[0002] Magnetic bearings usually use magnetic force to achieve contactless suspension of motor rotors. This technology eliminates the mechanical contact in traditional mechanical bearings, significantly reduces friction and wear, and improves the reliability and stability of the system. Its main working principle is based on the precise control of the strength and distribution of the magnetic field to form a stable magnetic field around the rotor, allowing the rotor to levitate and rotate freely. The thrust plate of the magnetic bearing is one of the key components in the magnetic bearing system. It provides support force to ensure the axial movement of the rotor through the electromagnetic force generated by the axial thrust coil to maintain the stable suspension of the rotor.

[0003] However, the thrust plate structure increases the wind friction (wind friction power consumption) when the motor is running, and also complicates the motor structure. How to design a magnetic bearing motor structure without a thrust plate is a research direction. Summary of the invention

[0004] The present invention provides a magnetic suspension bearing motor structure and method, which can realize the design of a magnetic suspension bearing motor without a thrust plate.

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

[0006] A magnetic suspension bearing motor structure, comprising a motor stator (2) arranged in a housing (1), and a rotor (3) with a thrust shoulder (32) arranged in the central axis region of the electronic stator, wherein the bearing structure of the rotor comprises a radial magnetic suspension bearing (5) and an axial magnetic suspension bearing (6) arranged from the inside to the outside; The rotor is an integrated rotating shaft structure formed by assembling a rotating shaft and a permanent magnet, and thrust shoulders are arranged at both ends of the integrated rotating shaft structure; in the magnetic circuit of the axial magnetic suspension bearing, the axial magnetic suspension bearing forms an axial magnetic field that can couple with the thrust shoulder of the rotor through its magnetic conductive ring (62), and applies an axial magnetic force to the thrust shoulder, so that the rotor remains stable in the axial direction during operation.

[0007] The motor structure is not provided with a thrust plate structure.

[0008] The radial magnetic suspension bearing and the axial magnetic suspension bearing are both arranged on the bearing seat (4).

[0009] The bearing structure also includes an auxiliary bearing (7) arranged at its outer end.

[0010] The auxiliary bearing end cover (8) of the auxiliary bearing is fixed by end cover fixing bolts (9).

[0011] The magnetic conductive ring is arranged on the inner wall of an axial magnetic suspension bearing base body (61) of the axial magnetic suspension bearing, and the magnetic conductive ring is protrudingly arranged on the inner wall of the base body.

[0012] The thrust shoulder of the rotor has a shoulder diameter that is larger than the rotor shaft section (33).

[0013] The vertical surface of the thrust shoulder of the rotor is directly opposite to and closely adjacent to the vertical surface of the magnetic conductive ring of the axial magnetic suspension bearing.

[0014] The operating method of a magnetic suspension bearing motor structure is used for the magnetic suspension bearing motor structure described above. When the motor is in operation, the magnetic force of the axial magnetic suspension bearing sequentially passes through the axial magnetic suspension bearing base (61), the magnetic conductive 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 suspension bearing base acts on the thrust shoulder of the rotor through the magnetic conductive ring of the axial magnetic suspension bearing, so that the rotor remains stable in the axial direction during operation.

[0015] The assembly method of the magnetic bearing motor structure is used for the magnetic bearing motor structure described above, and comprises the following steps: Step S1, the housing and the stator of the motor are assembled into a motor stator housing assembly by thermal assembly, and then the rotor and the motor stator housing assembly are assembled into the main structure of the motor; Step S2, the bearing seat assemblies at both ends of the housing are composed of a bearing seat, a radial magnetic bearing, an axial magnetic bearing, and an auxiliary bearing; first, the radial magnetic bearing and the axial magnetic bearing are fixed in the bearing seat by thermal assembly, and then the bearing seat assemblies at both ends are respectively installed in the housing; Step S3, respectively sleeve 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; Step S4, fix the auxiliary bearing end cover on the axial magnetic bearing 6 through the end cover fixing bolts. The auxiliary bearing end cover is used to fix the position of the auxiliary bearing to prevent its position from changing due to vibration during operation.

[0016] The present invention proposes a magnetic bearing motor structure and method. Its thrust plate-free magnetic bearing design can overcome the limitations of traditional magnetic bearings. It adopts the rotor thrust shoulder output method to reduce the wind friction of the thrust plate with a larger diameter, increase the safety margin of the rotor dynamics, improve the dynamic control performance of high-speed rotation, and enable the radial magnetic bearing and the axial magnetic bearing to be easily integrated into one, further reducing the overall volume and improving the space utilization rate of the equipment.

[0017] While maintaining the original design advantages of the magnetic bearing, the present invention simplifies the magnetic bearing motor structure through the design of the magnetic bearing and the motor rotor structure, further improves the stability and applicability of the entire rotating system, and opens up more possibilities for its application in high-speed rotating machinery and special environments.

[0018] The present invention uses the structural design of the rotor to make the magnetic circuit of the axial magnetic bearing generate axial force on the rotor shoulder through the axial magnetic bearing magnetic guide ring, so as to eliminate the thrust plate and simplify the structure of the magnetic bearing. Furthermore, according to this structural design, the radial magnetic bearing, the axial magnetic bearing and the bearing seat are formed into a composite component, which can make the installation and production of the magnetic bearing motor structure integrated and efficient.

[0019] In the present invention, the rotor is an integrated shaft structure assembled by a shaft and a permanent magnet, and thrust shoulders are designed at both ends of the rotor; the axial magnetic bearing couples the axial magnetic field with the rotor shoulder through a magnetic ring, and applies electromagnetic force to the thrust shoulder, thereby replacing the thrust plate structure; accordingly, the motor stator is assembled in the shell in the form of a shrink fit, and forms a basic motor structure with the rotor; the radial magnetic bearing and the axial magnetic bearing are fixedly installed in the bearing seat to form a composite assembly, and two identical bearing seats are shrink fit in the shell in the same way, thereby greatly simplifying the installation of the magnetic bearing.

[0020] The main advantages of the present invention are concentrated in the following points: 1. Reduce losses. The thrust plate-free structure reduces the wind friction of the thrust plate and improves system efficiency.

[0021] 2. Improve the rotor dynamic margin. Removing the thrust plate greatly reduces the rotor outer diameter, increases the critical speed of the overall rotor structure, and makes the rotor dynamic performance more stable.

[0022] 3. Improve the dynamic performance of high-speed rotation of magnetic bearings. The absence of thrust disc simplifies the overall structure of the rotor and reduces unnecessary external operating disturbances, thereby improving the response speed and stability of the system. This is especially important for applications that require fast start, stop or acceleration.

[0023] 4. Further improve the integration level, simplify the magnetic bearing motor structure, reduce costs and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Attached Figure 1 It is a structural schematic diagram of a specific embodiment of the present invention; Attached Figure 2 is a magnetic circuit schematic diagram of a specific embodiment of the present invention; In the figure: 1. housing; 2. motor stator; 3. rotor; 4. bearing seat; 5. radial magnetic bearing; 6. axial magnetic 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 bearing base; 62. magnetic guide ring. DETAILED DESCRIPTION

[0025] As shown in the figure, a magnetic suspension bearing motor structure includes a motor stator 2 arranged in a housing 1, a rotor 3 with a thrust shoulder 32 arranged in the central axis area of ​​the electronic stator, and the bearing structure of the rotor includes a radial magnetic suspension bearing 5 and an axial magnetic suspension bearing 6 arranged from the inside to the outside; The rotor is an integrated shaft structure composed of a shaft and a permanent magnet, and thrust shoulders are arranged at both ends of the integrated shaft structure; in the magnetic circuit of the axial magnetic bearing, the axial magnetic bearing forms an axial magnetic field through its magnetic conductive ring 62 that can couple with the thrust shoulder of the rotor, and applies axial magnetic force to the thrust shoulder to keep the rotor stable in the axial direction during operation.

[0026] The motor structure is not provided with a thrust plate structure.

[0027] The radial magnetic bearing and the axial magnetic bearing are both arranged on the bearing seat 4 .

[0028] The bearing structure further comprises an auxiliary bearing 7 arranged at its outer end.

[0029] The auxiliary bearing end cover 8 of the auxiliary bearing is fixed by end cover fixing bolts 9.

[0030] The magnetic conductive ring is arranged on the inner wall of the axial magnetic suspension bearing base 61 of the axial magnetic suspension bearing, and the magnetic conductive ring is protrudingly arranged on the inner wall of the base.

[0031] The thrust shoulder of the rotor has a shoulder diameter greater than that of the rotor shaft section 33 .

[0032] The vertical surface of the thrust shoulder of the rotor is directly opposite to and closely adjacent to the vertical surface of the magnetic conductive ring of the axial magnetic suspension bearing.

[0033] The operating method of the magnetic bearing motor structure is used for the magnetic bearing motor structure described above. When the motor is running, the magnetic force of the axial magnetic bearing sequentially passes through the axial magnetic bearing base 61, the magnetic conductive 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 bearing base acts on the thrust shoulder of the rotor through the magnetic conductive ring of the axial magnetic bearing, so that the rotor remains stable in the axial direction during operation.

[0034] The assembly method of the magnetic bearing motor structure is used for the magnetic bearing motor structure described above, and comprises the following steps: Step S1, the housing and the stator of the motor are assembled into a motor stator housing assembly by thermal assembly, and then the rotor and the motor stator housing assembly are assembled into the main structure of the motor; Step S2, the bearing seat assemblies at both ends of the housing are composed of a bearing seat, a radial magnetic bearing, an axial magnetic bearing, and an auxiliary bearing; first, the radial magnetic bearing and the axial magnetic bearing are fixed in the bearing seat by thermal assembly, and then the bearing seat assemblies at both ends are respectively installed in the housing; Step S3, respectively sleeve 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; Step S4, fix the auxiliary bearing end cover on the axial magnetic bearing 6 through the end cover fixing bolts. The auxiliary bearing end cover is used to fix the position of the auxiliary bearing to prevent its position from changing due to vibration during operation.

[0035] Example: Based on the above implementation, this example proposes a magnetic bearing motor structure without a thrust plate.

[0036] like Figure 1 FIG. 1 is a schematic diagram of a specific embodiment of the present invention. In the figure, the magnetic bearing motor structure is composed of a housing 1, a motor stator 2, a rotor 3, a bearing seat 4, a radial magnetic bearing 5, an axial magnetic bearing 6, an auxiliary bearing 7, an auxiliary bearing end cover 8, and end cover fixing bolts 9.

[0037] The housing 1 and the motor stator 2 are assembled into a motor stator housing assembly by thermal assembly, and then the rotor 3 and the motor stator housing assembly are assembled into the basic structure of the motor.

[0038] The bearing seat assemblies at both ends are composed of a bearing seat 4, a radial magnetic bearing 5, an axial magnetic bearing 6, and an auxiliary bearing 7. The radial magnetic bearing 5 and the axial magnetic bearing 6 are fixed in the bearing seat 4 by thermal assembly. Then, the bearing seat assemblies at both ends are respectively installed in the housing 1.

[0039] The auxiliary bearings 7 at both ends are respectively sleeved on the rotor 3 so that the rotor 3 can rotate smoothly on the auxiliary bearings 7 .

[0040] The auxiliary bearing end cover 8 is fixed on the axial magnetic bearing 6 by the end cover fixing bolts 9. The auxiliary bearing end cover 8 can fix the position of the auxiliary bearing 7 to avoid position change due to vibration during operation.

[0041] like Figure 2 FIG. 1 is a schematic diagram of a magnetic circuit according to a specific embodiment of the present invention.

[0042] The axial magnetic bearing base 61 is designed with an axial magnetic bearing magnetic guide ring 62 , and the magnetic guide ring 62 protrudes from the inner diameter of the axial magnetic bearing base 61 .

[0043] The rotor thrust shoulder 32 is 5 mm larger than the outer diameter of the rotor shaft section 33 and coincides with the diameter of the axial magnetic suspension bearing magnetic guide ring 62 .

[0044] The axial magnetic bearing base 61, the axial magnetic bearing magnetic 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 bearing base 61 applies the axial magnetic force to the rotor thrust shoulder 32 through the axial magnetic bearing magnetic ring 62, so that the rotor remains stable in the axial direction during operation.

Claims

1. A magnetic bearing motor structure, characterized in that: It comprises a motor stator (2) arranged in a housing (1), and a rotor (3) with a thrust shoulder (32) arranged in the central axis region of the electronic stator, wherein the bearing structure of the rotor comprises a radial magnetic suspension bearing (5) and an axial magnetic suspension bearing (6) arranged from the inside to the outside; The rotor is an integrated rotating shaft structure formed by assembling a rotating shaft and a permanent magnet, and thrust shoulders are arranged at both ends of the integrated rotating shaft structure; in the magnetic circuit of the axial magnetic suspension bearing, the axial magnetic suspension bearing forms an axial magnetic field that can couple with the thrust shoulder of the rotor through its magnetic conductive ring (62), and applies an axial magnetic force to the thrust shoulder, so that the rotor remains stable in the axial direction during operation.

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

3. The magnetic bearing motor structure according to claim 1, characterized in that: The radial magnetic suspension bearing and the axial magnetic suspension bearing are both arranged on the bearing seat (4).

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

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

6. The magnetic bearing motor structure according to claim 1, characterized in that: The magnetic conductive ring is arranged on the inner wall of an axial magnetic suspension bearing base body (61) of the axial magnetic suspension bearing, and the magnetic conductive ring is protrudingly arranged on the inner wall of the base body.

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

8. The magnetic bearing motor structure according to claim 7, characterized in that: The vertical surface of the thrust shoulder of the rotor is directly opposite to and closely adjacent to the vertical surface of the magnetic conductive ring of the axial magnetic suspension bearing.

9. The operation method of the magnetic bearing motor structure is characterized by: When the motor is in operation, the magnetic force of the axial magnetic bearing sequentially passes through the axial magnetic bearing base (61), the magnetic conductive 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 bearing base acts on the thrust shoulder of the rotor through the magnetic conductive ring of the axial magnetic bearing, so that the rotor remains stable in the axial direction during operation.

10. A method for assembling a magnetic bearing motor structure, characterized in that: The steps include: Step S1, the housing and the stator of the motor are assembled into a motor stator housing assembly by thermal assembly, and then the rotor and the motor stator housing assembly are assembled into the main structure of the motor; Step S2, the bearing seat assemblies at both ends of the housing are composed of a bearing seat, a radial magnetic bearing, an axial magnetic bearing, and an auxiliary bearing; first, the radial magnetic bearing and the axial magnetic bearing are fixed in the bearing seat by thermal assembly, and then the bearing seat assemblies at both ends are respectively installed in the housing; Step S3, respectively sleeve 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; Step S4, fix the auxiliary bearing end cover on the axial magnetic bearing 6 through the end cover fixing bolts. The auxiliary bearing end cover is used to fix the position of the auxiliary bearing to prevent its position from changing due to vibration during operation.

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