Magnetic bearing motor
By setting a tapered surface magnet and a mating surface between the magnet and the magnetic bearing in the magnetic levitation bearing motor, the problems of axial and radial movement are solved, achieving a compact design, low energy consumption and low cost of the motor, and improving stability.
Patent Information
- Application Number
- CN202423121174.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-17
AI Technical Summary
Existing magnetic levitation bearing motors are prone to axial and radial movement under heavy loads, high speeds, or high precision conditions, resulting in large size and high cost.
The mating surfaces of the magnet and the magnet body are set into conical surfaces to replace radial and axial bearings. The magnet and the magnet body work together to support the rotating shaft through magnetic force, avoiding axial and radial movement. The magnet body is equipped with a wear-resistant coating to reduce wear.
The number of bearings has been reduced, resulting in a more compact motor, lower energy consumption, reduced production and maintenance costs, and improved stability.
Smart Images
Figure CN223553144U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor technology, and in particular to a magnetic levitation bearing motor. Background Technology
[0002] Magnetic bearings levitate the rotor in mid-air using magnetic force, eliminating mechanical contact between the rotor and stator. Compared to traditional rolling bearings, sliding bearings, and oil film bearings, magnetic bearings eliminate mechanical contact, allowing the rotor to operate at very high speeds. They offer advantages such as low mechanical wear, low energy consumption, low noise, long lifespan, no lubrication required, and no oil pollution, making them particularly suitable for high-speed, vacuum, and ultra-clean environments. The working principle of a magnetic bearing motor is primarily based on levitation of the rotor through magnetic bearings, eliminating mechanical contact between the rotor and stator. This eliminates friction and vibration associated with traditional bearings, reducing energy consumption and noise, extending motor lifespan, and improving operational accuracy and stability. Currently, magnetic bearing motors are widely used in semiconductor manufacturing, physics research, robotics, high-speed, high-precision machine tools and micromechanics, computers, vacuum and cleanroom technologies, and other fields.
[0003] In applications requiring heavy loads, high speeds, or high precision, magnetic levitation bearing motors typically require multiple axial and radial bearings to prevent axial and radial movement of the shaft during operation. However, multiple bearings occupy significant space, increasing motor size, energy consumption, and efficiency. Furthermore, multiple bearings increase production and maintenance costs. Therefore, a new type of magnetic levitation bearing motor needs to be designed. Utility Model Content
[0004] The purpose of this application is to provide a magnetic levitation bearing motor that aims to solve the technical problems of existing magnetic levitation bearing motors, such as easy axial and radial movement, large size, and high cost.
[0005] This application provides a magnetic levitation bearing motor, including a base and a rotating shaft. A magnet is sleeved on the rotating shaft, and a magnet is provided inside the base. A coil is provided on the magnet. There is a small gap between the magnet and the magnet. The magnet and the magnet are used in conjunction, and the mating surface of the two is a conical surface.
[0006] In one embodiment, both the magnet and the magnet body are arranged in a ring shape.
[0007] In one embodiment, the magnet has the same magnetic poles as the magnet.
[0008] In one embodiment, a wear-resistant coating is provided on the mating surface of the magnet and at least one of the magnets.
[0009] In one embodiment, the wear-resistant coating comprises a polytetrafluoroethylene coating or a molybdenum disulfide layer.
[0010] In one embodiment, the system further includes a stator and a rotor, with the stator disposed on the inner wall of the base and the rotor disposed on the rotating shaft, the rotor being fitted and installed inside the stator.
[0011] In one embodiment, the base is further provided with a terminal block, which is connected to the stator.
[0012] In one embodiment, the device further includes end caps, with end caps provided at both ends of the base, and the rotating shaft being rotatably connected to the end caps via the magnet and the magnet body.
[0013] In one embodiment, an auxiliary magnet is also included, which is disposed on the magnet and is distributed circumferentially around the magnet.
[0014] This invention provides a magnetic levitation bearing motor. Compared with existing technologies, its advantages are as follows: by setting the mating surface between the magnet and the magnet body as a conical surface, axial and radial movement of the shaft can be avoided. Replacing radial and axial bearings reduces the number of bearings, resulting in a smaller motor size, a more compact structure, and lower energy consumption and higher efficiency at the same power. Furthermore, the reduction in the number of bearings also lowers production and maintenance costs. This invention features a compact structure, small size, low energy consumption, high efficiency, low production and maintenance costs, is less prone to axial and radial movement, has high stability, and is highly practical. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a cross-sectional structural diagram of a magnetic levitation bearing motor provided in Embodiment 1 of this application;
[0017] Figure 2 This is a right-side cross-sectional view of a magnetic levitation bearing motor provided in Embodiment 2 of this application;
[0018] Figure 3 This is a cross-sectional structural diagram of a magnetic levitation bearing motor provided in Embodiment 3 of this application;
[0019] Figure 4This is a right-side cross-sectional view of a magnetic levitation bearing motor provided in Embodiment 4 of this application.
[0020] Explanation of symbols in the diagram:
[0021] 1. Frame; 2. Shaft; 3. Stator; 4. Rotor; 5. Magnet; 6. Magnet; 7. Coil; 8. Auxiliary magnet; 9. End cover; 10. Terminal. Detailed Implementation
[0022] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0023] It should be noted that when a component is referred to as being "fixed" or "set" to another component, it can be directly or indirectly attached to that other component. When a component is referred to as being "connected" to another component, it can be directly or indirectly connected to that other component.
[0024] It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and should not be construed as indicating or implying that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0025] Example 1
[0026] Please see Figure 1 This is a cross-sectional structural diagram of a magnetic levitation bearing motor provided in Embodiment 1 of this application. For ease of explanation, only the parts relevant to this embodiment are shown, which are described in detail below:
[0027] A magnetic levitation bearing motor includes a base 1 and a rotating shaft 2. A magnet 6 is mounted on the rotating shaft 2, and a magnet 5 is installed inside the base 1. A coil 7 is mounted on the magnet 5. A small gap exists between the magnet 5 and the magnet 6. The magnet 5 and the magnet 6 work together, and their mating surface is conical. When the motor is running, the rotating shaft 2 rotates, and the coil 7 is energized. The magnetic field generated by the coil 7 interacts with the magnetic field generated by the magnet 6, forming a magnetic levitation force that suspends the rotating shaft 2 within the small gap. The magnet 5 and the magnet 6 work together to support the rotating shaft 2 through magnetic force. At the same time, because the mating surface of the magnet 5 and the magnet 6 is conical, axial and radial movement of the rotating shaft 2 is prevented, improving the stability of the motor during operation.
[0028] By setting the mating surface between the magnet 5 and the magnet 6 as a conical surface, axial and radial movement of the rotating shaft 2 can be avoided. Replacing radial and axial bearings reduces the number of bearings, making the motor smaller and more compact. It also has lower energy consumption and higher efficiency at the same power. In addition, the reduction in the number of bearings can also reduce production costs and later maintenance costs.
[0029] For details, please refer to Figure 1 Magnet 5 is mounted on the inner wall of the base 1, and magnet 6 is mounted on the outer wall of the rotating shaft 1. Both magnet 5 and magnet 6 are arranged in a ring shape. The ring design helps to provide a more uniform magnetic force distribution, thereby enhancing the stability and load-bearing capacity of the rotating shaft 2 suspension.
[0030] Please see Figure 1 In this embodiment, magnet 6 is a permanent magnet, which can generate a stable magnetic field and improve the stability of motor operation.
[0031] Please see Figure 1 In this embodiment, the number of magnets 5 and magnets 6 is set to two, and the mating surfaces of magnets 5 and magnets 6 are both set to be inclined inward to form two sets of bearings. The two sets of bearings are symmetrically arranged. This design can ensure that the magnetic levitation force on the left and right sides of the rotating shaft 2 remains consistent during rotation, thereby improving the stability of motor operation.
[0032] Please see Figure 1 Magnet 5 and magnet 6 have the same magnetic poles. Through the principle of like poles repelling each other, magnet 5 and magnet 6 cooperate to support the rotating shaft 2.
[0033] Please see Figure 1At least one of the mating surfaces of the magnet 5 and the magnet 6 is provided with a wear-resistant coating (not shown in the figure). The wear-resistant coating is used to reduce the wear rate of the mating surfaces of the magnet 5 and the magnet 6 during the friction process, thereby extending their service life. In addition, the wear-resistant coating can also improve the lubricity of the mating surfaces of the magnet 5 and the magnet 6, reduce the coefficient of friction, and reduce energy consumption. Furthermore, the wear-resistant coating can also improve the corrosion resistance of the magnet 5 and the magnet 6, enabling them to maintain the integrity of their mating surfaces in harsh environments and extend their service life.
[0034] Please see Figure 1 In this embodiment, wear-resistant coatings are provided on the mating surfaces of the magnet 5 and the magnet 6 to reduce the wear rate, improve the lubricity of the mating surfaces, improve corrosion resistance, and extend the service life.
[0035] Please see Figure 1 Wear-resistant coatings include polytetrafluoroethylene (PTFE) coatings or molybdenum disulfide (MoD) coatings. Wear-resistant coatings can also be made of other materials, as long as they possess anti-wear, lubricating, and corrosion-resistant properties.
[0036] Please see Figure 1 The motor also includes a stator 3 and a rotor 4. The stator 3 is mounted on the inner wall of the base 1, and the rotor 4 is mounted on the shaft 2. The rotor 4 is fitted inside the stator 3. The base 1 also has a terminal block 10, which is connected to the stator 3. It also includes end covers 9, with end covers 9 at both ends of the base 1. The shaft 2 is rotatably connected to the end covers 9 via magnets 5 and 6. The stator 3, rotor 4, end covers 9, and terminal blocks 10 are all basic components of the motor, ensuring its normal operation. When the terminal block 10 is connected to an external power source, the electromagnetic coil on the stator 3 is energized, generating a rotating magnetic field. This rotating magnetic field acts on the rotor 4, inducing a current. The induced current experiences a force in the magnetic field, causing the rotor 4 to rotate. The rotation of the rotor 4 drives the rotation of the shaft 2, thus operating the load.
[0037] The following combination Figure 1 The working process of a magnetic levitation bearing motor in Embodiment 1 is described as follows:
[0038] When in use, connect terminal 10 to an external power source. When the electromagnetic coil on the stator 3 is energized, it will generate a rotating magnetic field. The rotating magnetic field acts on the rotor 4 to generate an induced current. The induced current is subjected to a force in the magnetic field, which causes the rotor 4 to start rotating. The rotation of the rotor 4 drives the rotation of the shaft 2, thereby realizing the operation of the load.
[0039] Simultaneously, coil 7 is connected to an external power source. The magnetic field generated by coil 7 interacts with the magnetic field generated by magnet 6, forming a magnetic levitation force that suspends shaft 2 within a tiny gap. Magnet 5 works in conjunction with magnet 6 to support shaft 2 through magnetic force. This allows the motor to remain stable even at high speeds.
[0040] Meanwhile, since the mating surface between magnet 5 and magnet 6 is a conical surface, it can replace radial and axial bearings, avoid axial and radial movement of shaft 2, improve the stability of motor operation, reduce the number of bearings, make the motor structure more compact, reduce energy consumption, improve efficiency, and reduce production and maintenance costs.
[0041] Example 2
[0042] Please see Figure 2 This is a right-side cross-sectional view of a magnetic levitation bearing motor according to Embodiment 2 of this application. For ease of explanation, only the parts relevant to this embodiment are shown, as detailed below:
[0043] Compared to Embodiment 1, this embodiment differs in that it further includes an auxiliary magnet 8, which is disposed on the magnet 5 and arranged circumferentially around the magnet 6. The design of the auxiliary magnet 8 enables the rotor 2 to levitate, reduces the current in the coil 7, and lowers power consumption.
[0044] In this embodiment, the auxiliary magnet 8 is a permanent magnet, which can generate a stable magnetic field and improve the stability of motor operation.
[0045] In this embodiment, the structure and shape of the base 1, shaft 2, stator 3, rotor 4, end cover 9, and connector 10 are the same as in Embodiment 1, and will not be described again here.
[0046] Compared to Embodiment 1, in this embodiment, the auxiliary magnet 8 is used in conjunction with the coil 7 to achieve levitation support for the rotor 2. The presence of the auxiliary magnet 8 can reduce the current of the coil 7, reduce power consumption, and reduce production costs.
[0047] Example 3
[0048] Please see Figure 3 This is a cross-sectional structural diagram of a magnetic levitation bearing motor provided in Embodiment 3 of this application. For ease of explanation, only the parts relevant to this embodiment are shown, which are described in detail below:
[0049] Compared with Embodiment 1, the difference in this embodiment is that: in this embodiment, the number of magnets 5 and magnets 6 is set to two, and the mating surfaces of magnets 5 and magnets 6 are set to be inclined outward to form two sets of bearings. The two sets of bearings are symmetrically arranged, which improves the stability of motor operation.
[0050] In this embodiment, the structure and shape of the base 1, shaft 2, stator 3, rotor 4, end cover 9, and connector 10 are the same as in Embodiment 1, and will not be described again here.
[0051] Compared to Embodiment 1, this embodiment sets the number of magnets 5 and magnets 6 to two, and the mating surfaces of magnets 5 and magnets 6 are both set to be inclined outward to form two sets of bearings. The two sets of bearings are symmetrically arranged. This design can ensure that the magnetic levitation force on the left and right sides of the rotating shaft 2 remains consistent during rotation, thereby improving the running stability of the motor.
[0052] Example 4
[0053] Please see Figure 4 This is a right-side cross-sectional view of a magnetic levitation bearing motor according to Embodiment 4 of this application. For ease of explanation, only the parts relevant to this embodiment are shown, as detailed below:
[0054] Compared to Embodiment 3, this embodiment differs in that it further includes an auxiliary magnet 8, which is disposed on the magnet 5 and arranged circumferentially around the magnet 6. The design of the auxiliary magnet 8 enables the rotor 2 to levitate, reduces the current in the coil 7, and lowers power consumption.
[0055] In this embodiment, the auxiliary magnet 8 is a permanent magnet, which can generate a stable magnetic field and improve the stability of motor operation.
[0056] In this embodiment, the structure and shape of the base 1, shaft 2, stator 3, rotor 4, end cover 9, and terminal block 10 are the same as in embodiment 3, and will not be described again here.
[0057] Compared to Embodiment 3, in this embodiment, the auxiliary magnet 8 is used in conjunction with the coil 7 to achieve levitation support for the rotor 2. The presence of the auxiliary magnet 8 can reduce the current of the coil 7, reduce power consumption, and reduce production costs.
[0058] It is worth noting that the shapes of magnet 5 and magnet 6 are not limited. They can be the shapes in Embodiments 1 to 4, or other shapes besides Embodiments 1 to 4, as long as the mating surface of magnet 5 and magnet 6 is a conical surface. The specific shape depends on the specific working conditions.
[0059] In summary, this utility model provides a magnetic levitation bearing motor. By setting the mating surface between the magnet and the magnet body to a conical surface, axial and radial movement of the shaft can be avoided. Replacing radial and axial bearings reduces the number of bearings, resulting in a smaller motor size and a more compact structure. It also offers lower energy consumption and higher efficiency at the same power output. Furthermore, reducing the number of bearings lowers production and maintenance costs. This utility model features a compact structure, small size, low energy consumption, high efficiency, low production and maintenance costs, is less prone to axial and radial movement, exhibits high stability, and is highly practical, making it widely applicable in the field of motor technology.
[0060] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A magnetic levitation bearing motor, comprising a base (1) and a rotating shaft (2), characterized in that, A magnet (6) is sleeved on the rotating shaft (2), a magnet (5) is provided inside the base (1), a coil (7) is provided on the magnet (5), there is a small gap between the magnet (5) and the magnet (6), the magnet (5) and the magnet (6) are used together and the mating surface of the two is a conical surface.
2. The magnetic levitation bearing motor as described in claim 1, characterized in that, Both the magnet (5) and the magnet (6) are arranged in a ring shape.
3. The magnetic levitation bearing motor as described in claim 1, characterized in that, The magnet (5) has the same magnetic poles as the magnet (6).
4. The magnetic levitation bearing motor as described in claim 1, characterized in that, At least one of the magnets (5) and the magnet (6) has a wear-resistant coating on its mating surface.
5. The magnetic levitation bearing motor as described in claim 4, characterized in that, The wear-resistant coating includes a polytetrafluoroethylene coating or a molybdenum disulfide layer.
6. The magnetic levitation bearing motor as described in claim 1, characterized in that, It also includes a stator (3) and a rotor (4). The stator (3) is disposed on the inner wall of the base (1), and the rotor (4) is disposed on the rotating shaft (2). The rotor (4) is fitted inside the stator (3).
7. The magnetic levitation bearing motor as described in claim 6, characterized in that, The base (1) is also provided with a connector (10), which is connected to the stator (3).
8. The magnetic levitation bearing motor as described in claim 1, characterized in that, It also includes end caps (9), with end caps (9) provided at both ends of the base (1), and the rotating shaft (2) being rotatably connected to the end caps (9) through the magnet (5) and the magnet (6).
9. The magnetic levitation bearing motor as described in any one of claims 1-8, characterized in that, It also includes an auxiliary magnet (8), which is disposed on the magnet (5) and is distributed circumferentially around the magnet (6).