Magnetic suspension motor

Abstract

The utility model relates to the technical field of magnetic suspension motors, in particular to a magnetic suspension motor. The embodiment of the utility model provides a magnetic suspension motor, which comprises a shell, a rotating shaft, a motor stator assembly, a magnetic bearing and a floating ring, and is characterized in that the rotating shaft is arranged in the shell; along the radial direction of the rotating shaft, the motor stator assembly is arranged between the axial middle area of the rotating shaft and the shell; along the radial direction of the rotating shaft, the magnetic bearing is arranged between one axial end of the rotating shaft and the shell; along the axial direction of the rotating shaft, the floating ring sleeves the rotating shaft and is close to the magnetic bearing; wherein a first rubber ring is arranged on the radial inner side of the magnetic bearing, the first rubber ring and the floating ring are coaxial, and the inner diameter of the first rubber ring is roughly the same as that of the floating ring. The problems of loss and vibration generated by the floating ring after the rotating shaft collides with the floating ring when the rotating shaft falls off due to instability are solved, and the technical effect of reducing vibration and abrasion to the floating ring due to the fact that the rotating shaft falls off due to instability is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of magnetic levitation motors, and in particular to a magnetic levitation motor. Background Art

[0002] When a magnetic levitation motor rotates at high speeds and the shaft assembly is destabilized by collision or other interference, it will land on the protective bearing (auxiliary bearing), thereby protecting components such as the sensor assembly and magnetic bearing assembly from impact. The protective bearing is generally supported by an angular contact bearing, but angular contact bearings are fragile and bulky.

[0003] Some magnetic levitation motors use a floating ring instead of a protective bearing. When the shaft loses stability, it lands on the floating ring. The inner diameter of the floating ring is slightly smaller than that of the magnetic bearing, serving the same purpose as the protective bearing. The floating ring is typically made of copper or tin bronze, and all parts of the rotor assembly are also metal. When the shaft loses stability, it lands on the floating ring at a high speed. The metal floating ring and the metal shaft collide, generating significant vibration. This poses a safety hazard to electronic components such as sensor assemblies and circuit boards. Furthermore, the impact between the shaft and the floating ring produces a loud noise, and friction between the shaft and the floating ring leads to significant material loss. Utility Model Content

[0004] The present application provides a magnetic levitation motor, which solves the problem of loss and vibration caused by the floating ring after the rotating shaft collides with the floating ring when the rotating shaft becomes unstable and falls, and achieves the technical effect of reducing the vibration and wear of the floating ring caused by the unstable falling of the rotating shaft.

[0005] In order to achieve the above objectives, the main technical solutions adopted in this application include:

[0006] An embodiment of the present application provides a magnetic levitation motor, comprising a shell, a rotating shaft, a motor stator assembly, a magnetic bearing and a floating ring, wherein the rotating shaft is arranged in the shell; along the radial direction of the rotating shaft, the motor stator assembly is arranged between the axial middle area of ​​the rotating shaft and the shell; along the radial direction of the rotating shaft, the magnetic bearing is arranged between one axial end of the rotating shaft and the shell; along the axial direction of the rotating shaft, the floating ring is sleeved on the rotating shaft and close to the magnetic bearing; wherein a first rubber ring is arranged on the radial inner side of the magnetic bearing, the first rubber ring is coaxial with the floating ring, and the inner diameter of the first rubber ring is substantially the same as the inner diameter of the floating ring.

[0007] The magnetic levitation motor proposed in the embodiment of the present application includes a floating ring arranged near the magnetic bearing and a first rubber ring arranged radially inside the magnetic bearing. The first rubber ring and the floating ring are coaxial and the inner diameter of the first rubber ring is approximately the same as the inner diameter of the floating ring, that is, the inner diameter of the first rubber ring and the inner diameter of the floating ring are approximately on the same circumferential surface. When the rotating shaft becomes unstable and lands, the radial inner surface of the first rubber ring and the radial inner surface of the floating ring serve as support surfaces together. When the rotating shaft becomes unstable and lands, the contact area between the rotating shaft and the support surface is increased, and the wear and vibration of the floating ring caused by impacting the floating ring when the rotating shaft only contacts the floating ring is reduced, and the noise generated by impacting the floating ring is also reduced.

[0008] Optionally, there are two magnetic bearings, and the two magnetic bearings are respectively arranged between the axial ends of the rotating shaft and the shell; there are two floating rings and two first rubber rings, and along the axial direction of the rotating shaft, each floating ring is close to the corresponding magnetic bearing, and the first rubber ring is arranged on the radial inner side of the corresponding magnetic bearing.

[0009] Two magnetic bearings are respectively arranged at the axial ends of the rotating shaft, a floating ring is arranged near the axial direction of each magnetic bearing, and a first rubber ring is arranged on the radial inner side of each magnetic bearing. When the rotating shaft becomes unstable and lands, the contact area between the rotating shaft and the supporting surface is increased, and the wear and vibration of the floating ring caused by impacting the floating ring when the rotating shaft only contacts the floating ring is reduced, and the noise generated by impacting the floating ring is also reduced.

[0010] Optionally, there are two magnetic bearings including a first magnetic bearing and a second magnetic bearing. Along the radial direction of the rotating shaft, the first magnetic bearing is arranged between one axial end of the rotating shaft and the shell, and the second magnetic bearing is arranged between the other axial end of the rotating shaft and the shell; there are two floating rings including a first floating ring and a second floating ring. Along the axial direction of the rotating shaft, the first floating ring is sleeved on the rotating shaft and is located on the side of the first magnetic bearing away from the second magnetic bearing, and the second floating ring is sleeved on the rotating shaft and is located on the side of the second magnetic bearing away from the first magnetic bearing; there are two first rubber rings including a first sub-rubber ring and a second sub-rubber ring. The first sub-rubber ring is arranged on the radial inner side of the first magnetic bearing, and the second sub-rubber ring is arranged on the radial inner side of the second magnetic bearing. The first sub-rubber ring is coaxial with the first floating ring, and the inner diameter of the first sub-rubber ring is approximately the same as the inner diameter of the first floating ring. The second sub-rubber ring is coaxial with the second floating ring, and the inner diameter of the second sub-rubber ring is approximately the same as the inner diameter of the second floating ring.

[0011] A first floating ring is arranged near the axial direction of the first magnetic bearing, and a first sub-rubber ring is arranged on the radial inner side of the first magnetic bearing; a second floating ring is arranged near the axial direction of the second magnetic bearing, and a second sub-rubber ring is arranged on the radial inner side of the second magnetic bearing. The inner diameter surface of the second floating ring, the inner diameter surface of the first sub-rubber ring and the inner diameter surface of the second sub-rubber ring are on the same inner circumferential surface, serving as the contact surface when the rotating shaft lands. When the rotating shaft loses stability and lands, the contact area between the rotating shaft and the supporting surface is increased, and the wear and vibration of the floating ring caused by impacting the floating ring when the rotating shaft only contacts the floating ring is reduced, and the noise generated by impacting the floating ring is also reduced.

[0012] Optionally, the first floating ring and the second floating ring are respectively interference fit with the shell to limit the positions of the first floating ring and the second floating ring, thereby preventing the first floating ring and the second floating ring from moving axially and radially.

[0013] Optionally, along the axial direction of the rotating shaft, the housing includes a first housing and a second housing connected to each other, the first magnetic bearing and the first floating ring being disposed within the first housing, and the second magnetic bearing and the second floating ring being disposed within the second housing. The first floating ring being disposed within the first housing and the second floating ring being disposed within the second housing reduces the difficulty of installing the housing and the floating rings.

[0014] Optionally, the first housing is provided with a first limiter for limiting axial movement of the first floating ring along the rotating shaft, and the second housing is provided with a second limiter for limiting axial movement of the second floating ring along the rotating shaft. The first limiter limits axial movement of the first floating ring along the rotating shaft, while the second limiter limits axial movement of the second floating ring along the rotating shaft, thereby ensuring that the positions of the first and second floating rings remain stable.

[0015] Optionally, a first mounting hole for mounting the first floating ring is provided on the first shell, the first mounting hole includes a first hole and a second hole, the inner diameter of the first hole is larger than the inner diameter of the second hole to form a first step surface, along the axial direction of the rotating shaft, part of the first floating ring stops at the first step surface, and the first step surface is constructed as the first limiting portion; a second mounting hole for mounting the second floating ring is provided on the second shell, the second mounting hole includes a third hole and a fourth hole, the inner diameter of the third hole is larger than the inner diameter of the fourth hole to form a second step surface, along the axial direction of the rotating shaft, part of the second floating ring stops at the second step surface, and the second step surface is constructed as the second limiting portion.

[0016] Optionally, the floating ring is provided with a plurality of glue injection holes, the plurality of glue injection holes being spaced apart along the circumference of the floating ring, and each glue injection hole extending axially through the floating ring along the shaft. Providing glue injection holes on the floating ring can improve the fluidity of the glue during the glue injection process and enhance the quality of the resulting glue layer.

[0017] Optionally, a second rubber ring is disposed on the inner side of the motor stator assembly. The second rubber ring is coaxial with the floating ring and has an inner diameter that is substantially the same as the inner diameter of the floating ring. The second rubber ring is disposed radially inwardly of the motor stator assembly to reduce wear on the motor stator assembly when the rotating shaft descends.

[0018] Optionally, the floating ring is a composite material of polyetheretherketone and graphite. The floating ring made of the composite material of polyetheretherketone and graphite has the functions of vibration absorption, wear resistance and noise reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 This is a schematic diagram of the structure of the magnetic levitation motor of this application;

[0021] Figure 2 This is a schematic diagram of the partial structure of the first housing of the magnetic levitation motor of this application;

[0022] Figure 3 for Figure 2 Enlarged view of area A in the middle;

[0023] Figure 4 This is a schematic diagram of the partial structure of the second housing of the magnetic levitation motor of this application;

[0024] Figure 5 This is a schematic diagram of the structure of the floating ring of the magnetic levitation motor in this application.

[0025] [Description of Reference Numerals]

[0026] 1: Shell; 11: First shell; 110: First mounting hole; 111: First hole; 112: Second hole; 113: First step surface; 12: Second shell; 120: Second mounting hole; 121: Third hole; 122: Fourth hole; 123: Second step surface; 13: First limiting portion; 14: Second limiting portion; 2: Rotating shaft; 3: Motor stator assembly; 4: Magnetic bearing; 41: First magnetic bearing; 42: Second magnetic bearing; 5: Floating ring; 50: Glue injection hole; 51: First floating ring; 511: Third step surface; 52: Second floating ring; 6: First glue ring; 61: First sub-glue ring; 62: Second sub-glue ring; 7: Second glue ring. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0028] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0029] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0031] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0032] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0033] At present, some magnetic levitation motors use floating rings instead of protective bearings. When the rotating shaft becomes unstable, it lands on the floating ring. The inner diameter of the floating ring is slightly smaller than the inner diameter of the magnetic bearing, and plays the same role as the protective bearing. The floating ring is generally made of metal copper or tin bronze, and the parts on the rotor assembly are also metal parts. When the rotating shaft becomes unstable, it lands on the floating ring at a high speed. When the metal floating ring collides with the metal rotating shaft, it will generate large vibrations, posing hidden dangers to electronic components such as sensor components and circuit boards. At the same time, the collision between the rotating shaft and the floating ring generates a large noise, and friction is generated between the rotating shaft and the floating ring, resulting in large material loss. Therefore, it is necessary to develop a magnetic levitation motor that reduces the vibration and wear generated when the rotating shaft and the floating ring collide, thereby achieving the purpose of improving the performance of the magnetic levitation motor. The first magnetic bearing in the present application can be a first radial magnetic bearing, and the second magnetic bearing can be a second radial magnetic bearing.

[0034] The floating ring in this application, which frictionally contacts the rotor, is made of a polyetheretherketone (PEEK) and graphite composite material, offering vibration absorption, wear resistance, and noise reduction. The inner diameter of the floating ring serves as the core diameter for glue injection. After the glue solidifies, the entire inner circumference serves as the support surface. If the shaft becomes unstable, the glue will land on the entire inner circumference, effectively increasing the contact area between the floating ring and the shaft, further reducing wear, vibration, and noise generated by impact between the floating ring and the shaft.

[0035] refer to Figure 1The present invention provides a magnetic levitation motor, comprising a housing 1, a rotating shaft 2, a motor stator assembly 3, a magnetic bearing 4, and a levitation ring 5. The rotating shaft 2 is disposed within the housing 1. The motor stator assembly 3 is disposed radially between the axial middle region of the rotating shaft 2 and the housing 1. The magnetic bearing 4 is disposed radially between one axial end of the rotating shaft 2 and the housing 1. Axially, the levitation ring 5 is sleeved around the rotating shaft 2 and adjacent to the magnetic bearing 4. A first rubber ring 6 is disposed radially inwardly of the magnetic bearing 4. The first rubber ring 6 is coaxial with the levitation ring 5, and the inner diameter of the first rubber ring 6 is substantially the same as the inner diameter of the levitation ring 5. In other words, the rotating shaft 2 is disposed within the housing 1, and the magnetic bearing 4 and the motor stator assembly 3 are sleeved around the rotating shaft 2. Axially, the motor stator assembly 3 is located in the middle region of the rotating shaft 2, and the magnetic bearing 4 is located at one end of the rotating shaft 2. The first rubber ring 6 is disposed radially inwardly of the magnetic bearing 4 and between the magnetic bearing 4 and the rotating shaft 2. There is a gap between the first rubber ring 6 and the rotating shaft 2, and the gap between the first rubber ring 6 and the rotating shaft 2 is roughly equal to the gap between the floating ring 5 and the rotating shaft 2, so that the inner diameter of the circumferential surface where the floating ring 5 is located is the same as the inner diameter of the circumferential surface where the inner diameter of the first rubber ring 6 is located.

[0036] It should be understood that the floating ring 5 can be arranged on the side of the magnetic bearing 4 close to the motor stator assembly 3, or on the side away from the motor stator assembly 3, depending on the specific situation, and the present invention is not limited thereto.

[0037] The magnetic levitation motor proposed in the embodiment of the present application includes a floating ring 5 disposed near a magnetic bearing 4 and a first rubber ring 6 disposed radially inward of the magnetic bearing 4. The first rubber ring 6 and the floating ring 5 are coaxial, and the inner diameter of the first rubber ring 6 is substantially the same as the inner diameter of the floating ring 5. In other words, the inner diameter of the first rubber ring 6 and the inner diameter of the floating ring 5 are substantially on the same circumferential surface. When the rotating shaft 2 loses stability and falls, the radial inner surface of the first rubber ring 6 and the radial inner surface of the floating ring 5 jointly serve as a support surface. When the rotating shaft loses stability and falls, the contact area between the rotating shaft 2 and the support surface is increased, reducing the wear and vibration caused by the impact of the floating ring 5 when the rotating shaft 2 only contacts the floating ring 5. At the same time, the material of the first rubber ring 6 can also reduce the noise generated by the impact with the floating ring 5.

[0038] Optionally, there are two magnetic bearings 4, and the two magnetic bearings 4 are respectively arranged between the axial ends of the rotating shaft 2 and the housing 1; there are two floating rings 5 ​​and two first rubber rings 6, and along the axial direction of the rotating shaft 2, each floating ring 5 is close to the corresponding magnetic bearing 4, and the first rubber ring 6 is arranged radially inward of the corresponding magnetic bearing 4. The two magnetic bearings 4 are respectively arranged at the axial ends of the rotating shaft 2, and a floating ring 5 is respectively arranged near the axial direction of each magnetic bearing 4. When the rotating shaft 2 loses stability and lands, the two first rubber rings 6 increase the contact area between the rotating shaft 2 and the supporting surface, reduce the wear and vibration of the floating ring 5 caused by the impact on the floating ring 5 when the rotating shaft 2 only contacts the floating ring 5, and also reduce the noise generated by the impact with the floating ring 5.

[0039] Optionally, there are two magnetic bearings 4 and include a first magnetic bearing 41 and a second magnetic bearing 42. Along the radial direction of the rotating shaft 2, the first magnetic bearing 41 is arranged between one axial end of the rotating shaft 2 and the shell 1, and the second magnetic bearing 42 is arranged between the other axial end of the rotating shaft 2 and the shell 1; there are two floating rings 5 ​​and include a first floating ring 51 and a second floating ring 52. Along the axial direction of the rotating shaft 2, the first floating ring 51 is sleeved on the rotating shaft 2 and is located on the side of the first magnetic bearing 41 away from the second magnetic bearing 42, and the second floating ring 52 is sleeved on the rotating shaft 2 and is located on the side of the second magnetic bearing 42 away from the second magnetic bearing 42. The bearing 42 is located on the side away from the first magnetic bearing 41. The first rubber ring 6 is two and includes a first sub-ring 61 and a second sub-ring 62. The first sub-ring 61 is arranged radially inward of the first magnetic bearing 41, and the second sub-ring 62 is arranged radially inward of the second magnetic bearing 42. The first sub-ring 61 is coaxial with the first floating ring 51, and the inner diameter of the first sub-ring 61 is substantially the same as the inner diameter of the first floating ring 51. The second sub-ring 62 is coaxial with the second floating ring 52, and the inner diameter of the second sub-ring 62 is substantially the same as the inner diameter of the second floating ring 52. In other words, along the axial direction of the rotating shaft 2, the first floating ring 51, the first magnetic bearing 41, the motor stator assembly 3, the second magnetic bearing 42, and the second floating ring 52 are sequentially arranged. It should be understood that the magnetic levitation motor also includes a first radial sensor and a second radial sensor. The first radial sensor is arranged corresponding to the first magnetic bearing 41, and the second radial sensor is arranged corresponding to the second magnetic bearing 42. In an optional embodiment, along the axial direction of the rotating shaft 2, a first radial sensor, a first floating ring 51, a first magnetic bearing 41, a motor stator assembly 3, a second magnetic bearing 42, a second floating ring 52, and a second radial sensor are sequentially mounted.

[0040] A first floating ring 51 is disposed axially adjacent to the first magnetic bearing 41, and a first sub-rubber ring 61 is disposed radially inwardly of the first magnetic bearing 41. A second floating ring 52 is disposed axially adjacent to the second magnetic bearing 42, and a second sub-rubber ring 62 is disposed radially inwardly of the second magnetic bearing 42. The inner diameter surfaces of the second floating ring 52, the first sub-rubber ring 61, and the second sub-rubber ring 62 are located on the same inner circumferential surface, which serves as the contact surface for the shaft 2 during landing. This increases the contact area between the shaft 2 and the support surface when the shaft 2 lands unsteadily, reduces wear and vibration on the floating ring 5 caused by impact with the floating ring 5 when the shaft 2 contacts only the floating ring 5, and also reduces noise generated by impact with the floating ring 5. Optionally, the first floating ring 51 and the second floating ring 52 are each interference fit with the housing 1. The first and second floating rings 51, 52 form an interference fit with the housing 1, restricting their positions and preventing axial and radial movement. The interference fit of the floating rings 51, 52 with the housing 1, made of aluminum alloy, does not affect the supporting strength of the housing 1.

[0041] During the machining of the floating ring 5 and shell 1, the two components are first rough-machined separately, ensuring that the outer diameter of the floating ring 5 matches the inner diameter of the shell 1. The thickness of the two joints is the same, and the outer diameter of the floating ring 5 is approximately 10 mm larger than the inner diameter of the shell 1. A stopper is provided on the shell 1 to axially position the floating ring 5 and the shell 1. The shell 1 is heated to achieve an interference fit between the two components. The combined shell 1 and floating ring 5 are then fine-machined to ensure the inner diameter, outer diameter, thickness, and circular hole are precisely aligned. This machining process does not affect the overall dimensional accuracy.

[0042] Optionally, along the axial direction of the rotating shaft 2, the housing 1 includes a first housing 11 and a second housing 12 connected to each other, the first magnetic bearing 41 and the first floating ring 51 are disposed in the first housing 11, and the second magnetic bearing 42 and the second floating ring 52 are disposed in the second housing 12. The first floating ring 51 is disposed in the first housing 11, and the second floating ring 52 is disposed in the second housing 12, thereby reducing the difficulty of installing the housing 1 and the floating ring 5.

[0043] Optionally, a first stopper 13 is provided on the first housing 11 to limit the axial movement of the first floating ring 51 along the rotating shaft 2, and a second stopper 14 is provided on the second housing 12 to limit the axial movement of the second floating ring 52 along the rotating shaft 2. The first stopper 13 positions the first floating ring 51, limiting its axial movement along the rotating shaft 2 and ensuring that its position remains stable. The second stopper 14 positions the second floating ring 52, limiting its axial movement along the rotating shaft 2 and ensuring that its position remains stable.

[0044] Optionally, refer to Figures 2 to 4 A first mounting hole 110 for mounting the first floating ring 51 is provided on the first shell 11, and the first mounting hole 110 includes a first hole 111 and a second hole 112. The inner diameter of the first hole 111 is larger than the inner diameter of the second hole 112 to form a first step surface 113. Along the axial direction of the rotating shaft 2, part of the first floating ring 51 stops at the first step surface 113, and the first step surface 113 is configured as a first limiting portion 13; a second mounting hole 120 for mounting the second floating ring 52 is provided on the second shell 12, and the second mounting hole 120 includes a third hole 121 and a fourth hole 122. The inner diameter of the third hole 121 is larger than the inner diameter of the fourth hole 122 to form a second step surface 123. Along the axial direction of the rotating shaft 2, part of the second floating ring 52 stops at the second step surface 123, and the second step surface 123 is configured as a second limiting portion 14.

[0045] Specifically, refer to Figures 2 to 5 The first housing 11 has a first mounting hole 110. A first hole 111 with a larger inner diameter and a second hole 112 with a smaller inner diameter are radially inwardly located on the first mounting hole 110. The first hole 111 and the second hole 112 are coaxial, and a first stepped surface 113 is formed at the junction of the first hole 111 and the second hole 112. The first stepped surface 113 forms the first stop 13. Correspondingly, the first floating ring 51 also has a mating portion on its radially outer side that mates with the first hole 111, the second hole 112, and the first stepped surface 113. In other words, the first floating ring 51 also has a third stepped surface 511, which positions the first floating ring 51 within the first stop 13 and prevents axial movement of the first floating ring 51. The second housing 12 has a second mounting hole 120. Radially inwardly of the second mounting hole 120 is a third hole 121 with a larger inner diameter and a fourth hole 122 with a smaller inner diameter. The third hole 121 and the fourth hole 122 are coaxial, and a second stepped surface 123 is formed at the junction of the third and fourth holes 121, 122. The second stepped surface 123 forms the second stop 14. Correspondingly, the second floating ring 52 also has a mating portion on its radially outer side that mates with the third hole 121, the fourth hole 122, and the second stepped surface 123. In other words, the second floating ring 52 also has a fourth stepped surface, which positions the second floating ring 52 in the second stop 14 and prevents axial movement.

[0046] Optionally, the floating ring 5 is provided with a plurality of glue injection holes 50, which are spaced apart circumferentially along the floating ring 5, and each glue injection hole 50 extends axially through the floating ring 5 along the rotating shaft 2. Providing the glue injection holes 50 on the floating ring 5 can improve the fluidity of the glue during the glue injection process and enhance the quality of the formed glue layer.

[0047] Optionally, a second rubber ring 7 is provided on the inner side of the motor stator assembly 3. The second rubber ring 7 is coaxial with the floating ring 5 and has an inner diameter that is substantially the same as the inner diameter of the floating ring 5. The second rubber ring 7 is provided radially inwardly of the motor stator assembly 3. The provision of the second rubber ring 7 further increases the contact area of ​​the rotating shaft 2 when it falls, thereby reducing vibration and wear caused by the impact of the rotating shaft 2 when it falls. The second rubber ring 7 also reduces wear on the motor stator assembly 3. In an optional embodiment, the first rubber ring 6 and the second rubber ring 7 are an integral structure, and the inner diameters of the first rubber ring 6 and the second rubber ring 7 are approximately equal to the inner diameter of the floating ring 5. The radial inner surface of the first rubber ring 6, the radial inner surface of the second rubber ring 7 and the radial inner surface of the floating ring 5 are on the same inner circumferential surface, serving as a supporting surface in contact with the rotating shaft 2 when it falls. When the rotating shaft 2 loses stability and falls, the contact area between the rotating shaft 2 and the supporting surface is increased, and the wear and vibration of the floating ring 5 caused by the impact on the floating ring 5 when the rotating shaft 2 only contacts the floating ring 5 is reduced, and the noise generated by the impact with the floating ring 5 is also reduced.

[0048] Optionally, the floating ring 5 is a composite material of polyetheretherketone (PEEK) and graphite. This composite material provides vibration absorption, wear resistance, and noise reduction. The material combination of the first and second rubber rings 6 and 7 significantly reduces vibration, wear, and noise generated when the rotating shaft 2 falls.

[0049] The floating ring 5 is assembled with the housing 1 after an interference fit, and then the housing 1 and floating ring 5 are finely machined. The housing 1 has multiple spaced-apart waist-shaped holes and assembly holes. The waist-shaped holes are used to inject glue into the housing 1, and the assembly holes are used to securely connect the first and second housings 11 and 12. The floating ring 5 has wiring holes, glue injection holes 50, and mounting holes. The mounting holes are used to mount sensors, and the glue injection holes 50 facilitate glue flow during glue injection. The first floating ring 51 is interference-fitted with the first housing 11, and the second floating ring 52 is interference-fitted with the second housing 12. They are then assembled with the first and second magnetic bearings 41 and 42, and the motor stator assembly 3. The first and second housings 11 and 12 are then securely connected with bolts to form the core assembly of the magnetic levitation motor. A glue injection mandrel is inserted into the center of the core assembly, where the rotating shaft 2 is mounted. The outer diameter of the glue injection mandrel matches the inner diameter (H7 / h6) of the floating ring 5. That is, glue is poured using the inner diameter of the floating ring 5 as the diameter of the glue pouring mandrel. After the glue solidifies, a first glue ring 6 and a second glue ring 7 are formed on the outer surface of the glue pouring mandrel. The first glue ring 6 and the second glue ring 7 form a one-piece structure, that is, the first sub-glue ring 61, the second sub-glue ring 62, and the second glue ring 7 form a one-piece structure. Furthermore, after glue pouring, the inner diameter of the second glue ring 7 corresponding to the motor stator assembly 3 and the inner diameter of the first glue ring 6 corresponding to the magnetic bearing 4 are approximately the same as the inner diameter of the floating ring 5, and the entire inner circumference serves as a support surface. The first glue ring 6, the second glue ring 7, and the floating ring 5 are located on the same inner circumference, with a gap between this inner circumference and the rotating shaft 2. When the rotating shaft 2 loses stability, it will land on the entire inner circumference. The larger contact area reduces the wear and vibration caused by the impact of the rotating shaft 2 with the floating ring 5 when it lands, and also reduces the noise generated by the impact with the floating ring 5. It should be understood that during the glue pouring process, the glue flows to every corner between the housing 1 and the glue pouring core shaft, that is, the glue in each gap in the housing forms a whole after solidification.

[0050] Specifically, along the axial direction of the rotating shaft 2, the second rubber ring 7 is connected to the first rubber rings 6 on both sides through connecting rubber rings. The second rubber ring 7, the two first rubber rings 6 and the two connecting rubber rings can be an integrally formed part, and the axes of any two of the two rubber rings 7, the two first rubber rings 6 and the two connecting rubber rings coincide.

[0051] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0052] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0053] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

[0054] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A magnetic levitation motor, characterized in that: include: case; a rotating shaft, disposed in the housing; a motor stator assembly, arranged along the radial direction of the rotating shaft between an axial middle region of the rotating shaft and the housing; a magnetic bearing, arranged between one axial end of the rotating shaft and the housing along the radial direction of the rotating shaft; a floating ring, which is sleeved on the rotating shaft and close to the magnetic bearing along the axial direction of the rotating shaft; Wherein, a first rubber ring is provided on the radial inner side of the magnetic bearing, the first rubber ring is coaxial with the floating ring, and the inner diameter of the first rubber ring is substantially the same as the inner diameter of the floating ring.

2. The magnetic levitation motor according to claim 1, characterized in that: There are two magnetic bearings, and the two magnetic bearings are respectively arranged between the axial ends of the rotating shaft and the housing; There are two floating rings and two first rubber rings. Along the axial direction of the rotating shaft, each floating ring is close to the corresponding magnetic bearing, and the first rubber ring is arranged on the radial inner side of the corresponding magnetic bearing.

3. The magnetic levitation motor according to claim 1 or 2, characterized in that: There are two magnetic bearings including a first magnetic bearing and a second magnetic bearing. Along the radial direction of the rotating shaft, the first magnetic bearing is arranged between one axial end of the rotating shaft and the housing, and the second magnetic bearing is arranged between the other axial end of the rotating shaft and the housing; There are two floating rings including a first floating ring and a second floating ring. Along the axial direction of the rotating shaft, the first floating ring is sleeved on the rotating shaft and is located on a side of the first magnetic bearing away from the second magnetic bearing. The second floating ring is sleeved on the rotating shaft and is located on a side of the second magnetic bearing away from the first magnetic bearing. There are two first rubber rings and include a first sub-rubber ring and a second sub-rubber ring. The first sub-rubber ring is arranged on the radial inner side of the first magnetic bearing, and the second sub-rubber ring is arranged on the radial inner side of the second magnetic bearing. The first sub-rubber ring is coaxial with the first floating ring, and the inner diameter of the first sub-rubber ring is approximately the same as the inner diameter of the first floating ring. The second sub-rubber ring is coaxial with the second floating ring, and the inner diameter of the second sub-rubber ring is approximately the same as the inner diameter of the second floating ring.

4. The magnetic levitation motor according to claim 3, characterized in that: The first floating ring and the second floating ring are respectively interference-fitted with the shell.

5. The magnetic levitation motor according to claim 3, characterized in that: Along the axial direction of the rotating shaft, the housing includes a first housing and a second housing connected to each other, the first magnetic bearing and the first floating ring are arranged in the first housing, and the second magnetic bearing and the second floating ring are arranged in the second housing.

6. The magnetic levitation motor according to claim 5, characterized in that: The first housing is provided with a first limiting portion for limiting the axial movement of the first floating ring along the rotating shaft, and the second housing is provided with a second limiting portion for limiting the axial movement of the second floating ring along the rotating shaft.

7. The magnetic levitation motor according to claim 6, characterized in that: The first housing is provided with a first mounting hole for mounting the first floating ring. The first mounting hole includes a first hole and a second hole. The inner diameter of the first hole is larger than the inner diameter of the second hole to form a first step surface. Along the axial direction of the rotating shaft, a portion of the first floating ring abuts against the first step surface. The first step surface is configured as the first limiting portion. A second mounting hole for mounting the second floating ring is provided on the second shell, and the second mounting hole includes a third hole and a fourth hole. The inner diameter of the third hole is larger than the inner diameter of the fourth hole to form a second step surface. Along the axial direction of the rotating shaft, part of the second floating ring stops at the second step surface, and the second step surface is constructed as the second limiting portion.

8. The magnetic levitation motor according to claim 1, characterized in that: The floating ring is provided with a plurality of glue injection holes, the plurality of glue injection holes are spaced apart along the circumference of the floating ring, and each of the glue injection holes passes through the floating ring along the axial direction of the rotating shaft.

9. The magnetic levitation motor according to claim 1, characterized in that: A second rubber ring is provided on the radial inner side of the motor stator assembly. The second rubber ring is coaxial with the floating ring, and the inner diameter of the second rubber ring is substantially the same as the inner diameter of the floating ring.

10. The magnetic levitation motor according to claim 1, characterized in that: The floating ring is a composite material of polyetheretherketone and graphite.

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