Hybrid magnetic suspension bearing

Abstract

The utility model discloses a hybrid magnetic suspension bearing which comprises a stator and a rotor, the stator comprises a stator iron core, at least two stator magnetic rings and a plurality of coils, the stator iron core is provided with a stator ring and a plurality of stator teeth which are annularly distributed on the inner wall of the stator ring at equal intervals in the radial direction, and the plurality of coils are wound on the plurality of stator teeth in a one-to-one correspondence mode. At least one stator magnetic ring is coaxially mounted at each of the two ends of the stator ring; the rotor is arranged in the stator and is in clearance fit with the stator, annular rotor teeth are arranged on the peripheral surface of the rotor, and the stator teeth and the rotor teeth are arranged oppositely in the radial direction; the stator magnetic rings located at the two ends of the stator ring are magnetized in the axial direction, and the magnetizing directions are opposite, so that closed magnetic loops can be formed between the stator magnetic rings and the stator iron core and between the stator magnetic rings and the rotor. According to the utility model, the low power consumption characteristic of the permanent magnet bearing is maintained, high-precision suspension and adjustment are realized through electromagnetic control, five-degree-of-freedom suspension is realized, the size can be smaller, and the structure is more compact.

Description

Technical Field

[0001] The utility model relates to the technical field of bearings, and particularly relates to a hybrid magnetic levitation bearing. Background Art

[0002] As a key supporting component of a rotating body, the performance of a bearing has a crucial impact on the operating efficiency, stability, and reliability of the entire rotating body. Traditional mechanical bearings, such as rolling bearings and sliding bearings, will have problems such as wear, heat generation, and energy loss during operation due to physical contact and friction. To overcome the defects of traditional mechanical bearings, magnetic levitation bearing technology has emerged. Magnetic levitation bearings use magnetic force to suspend the rotor, eliminating mechanical contact and friction, and having advantages such as no wear, no need for lubrication, and good high-speed adaptability.

[0003] However, a single type of magnetic levitation bearing also has certain limitations in practical applications. For example, pure electromagnetic levitation bearings usually require a large current to generate sufficient magnetic force, resulting in high power consumption, and will lose the levitation ability in the case of power failure. Although pure permanent magnet levitation bearings can reduce power consumption to a certain extent, the adjustment range of the magnetic force is relatively narrow, making it difficult to adapt to complex working conditions changes.

[0004] In this context, hybrid magnetic levitation bearing technology has emerged. However, existing hybrid magnetic levitation bearings still have some significant problems in practical applications. On the one hand, although traditional magnetic levitation bearings can achieve a certain degree of levitation and control, their power consumption is still often high, which not only increases the operating cost of the system but may also cause related problems such as heat dissipation, restricting their application in some environments with limited energy supply or harsh heat dissipation conditions, such as implantable blood pumps. On the other hand, the existing magnetic levitation bearings are usually relatively large in volume. In equipment with space limitations, such as implantable blood pumps, the excessive volume will not only increase the surgical difficulty and the patient's trauma but also affect the patient's comfort and recovery process. Therefore, it is necessary to improve the existing technology to overcome the defects in the existing technology. Summary of the Utility Model

[0005] The problem to be solved by the utility model is to provide a hybrid magnetic levitation bearing to overcome the defects of high power consumption and large volume of existing magnetic levitation bearings.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a hybrid magnetic levitation bearing, comprising:

[0007] Stator, the stator includes a stator core, at least two stator magnetic rings and a plurality of coils. The stator core is provided with a stator ring and a plurality of stator teeth that are radially and annularly equidistantly distributed on the inner wall of the stator ring. The plurality of coils are respectively wound around the plurality of stator teeth, and at least one of the stator magnetic rings is coaxially installed at both ends of the stator ring;

[0008] Rotor, the rotor is arranged inside the stator and is in clearance fit with the stator. An annular rotor tooth is provided on the outer peripheral surface of the rotor, and the plurality of stator teeth are all arranged radially opposite to the rotor teeth;

[0009] Among them, the stator magnetic rings located at both ends of the stator ring are magnetized along the axial direction and the magnetization directions are opposite, so that a closed magnetic circuit can be formed between the stator magnetic rings and the stator core and the rotor.

[0010] As a further improvement of the present invention, the stator further includes two stator yokes. The two stator yokes are symmetrically distributed along the axial direction on both sides of the stator core, and the two stator yokes are respectively fixed on one end of the two stator magnetic rings facing each other.

[0011] As a further improvement of the present invention, the stator yoke extends radially inward with an annular inner convex tooth, and the two ends of the rotor extend radially outward with an annular outer convex tooth. The outer convex tooth and the corresponding inner convex tooth are arranged radially opposite and in clearance fit.

[0012] As a further improvement of the present invention, the rotor teeth are provided with a plurality of axially spaced-apart arrangements, and the inner side surface of the stator teeth is provided with a plurality of tooth parts that have the same number as the rotor teeth and are arranged one-to-one opposite.

[0013] As a further improvement of the present invention, both the stator and the rotor are provided with two groups arranged axially.

[0014] As a further improvement of the present invention, non-magnetic washers are fixedly connected between the two groups of stators and the two groups of rotors.

[0015] As a further improvement of the present invention, the coils wound on each stator tooth work independently.

[0016] As a further improvement of the present invention, the number of the stator teeth is configured to be more than three, and the number of the corresponding coils is also configured to be more than three.

[0017] As a further improvement of the present invention, the rotor is annular.

[0018] The beneficial effects of the present utility model are as follows: The present utility model provides a hybrid magnetic levitation bearing. By adopting the form of combining permanent magnet and electromagnetism, and using the permanent magnet force of the stator magnetic ring to provide a static bias magnetic field, while using the electromagnet composed of stator teeth and coils as a dynamic suspension auxiliary adjustment, it not only maintains the low-power consumption characteristics of the permanent magnet bearing, but also realizes high-precision suspension and adjustment through electromagnetic control, achieving five-degree-of-freedom suspension. It can not only reduce the bias current required for electromagnetic control, significantly reduce the power consumption of the system, making the bearing more advantageous in application scenarios that require long-term operation or have limited energy supply, but also enables the bearing to have higher load-bearing capacity and better stability, and can adapt to various complex working conditions; by arranging stator magnetic rings at both the upper and lower ends of the stator iron core, and the stator magnetic rings on the upper and lower sides can form two closed magnetic circuits through the stator teeth of the middle stator iron core and the rotor teeth of the rotor, the magnetic force utilization rate is higher. Under the same magnetic force requirement, the volume can be made smaller, the structure is more compact, it can provide a stable static bias magnetic field, and the bias current required for electromagnetic control is small, thus realizing a five-degree-of-freedom permanent magnet bias magnetic bearing with low power consumption, small volume and light weight; when used in a magnetic levitation blood pump, on the premise of ensuring blood compatibility and long-term reliability, it can achieve more efficient energy utilization and a more compact structural design to improve the overall performance and clinical applicability of the blood pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional view of the first embodiment of the hybrid magnetic levitation bearing of the present utility model;

[0020] Figure 2 is a cross-sectional view of the first embodiment of the hybrid magnetic levitation bearing of the present utility model;

[0021] Figure 3 is an exploded view of the stator of the first embodiment of the hybrid magnetic levitation bearing of the present utility model;

[0022] Figure 4 is a three-dimensional view of the rotor of the first embodiment of the hybrid magnetic levitation bearing of the present utility model;

[0023] Figure 5 is a schematic diagram of the magnetic circuit of the first embodiment of the hybrid magnetic levitation bearing of the present utility model;

[0024] Figure 6 is a schematic diagram of the axial offset of the rotor of the first embodiment of the hybrid magnetic levitation bearing of the present utility model;

[0025] Figure 7 is a schematic diagram of the radial offset of the rotor of the first embodiment of the hybrid magnetic levitation bearing of the present utility model;

[0026] Figure 8 is a cross-sectional view of the second embodiment of the hybrid magnetic levitation bearing of the present utility model;

[0027] Figure 9 This is a schematic diagram of the radial deflection of the rotor in the second embodiment of the hybrid magnetic levitation bearing of the present utility model;

[0028] Figure 10 This is a three-dimensional view of the stator core and coils in the third embodiment of the hybrid magnetic levitation bearing of the present utility model.

[0029] The following description is made in conjunction with the accompanying drawings:

[0030] 1. Stator; 11. Stator core; 111. Stator ring; 112. Stator teeth;

[0031] 1121. Tooth part; 12. Stator magnetic ring; 13. Coil; 14. Stator yoke; 141. Inner convex tooth; 2. Rotor; 201. Rotor teeth; 202. Outer convex teeth; 3. Non-magnetic washer. Specific embodiments

[0032] The following is a detailed description of the preferred embodiments of the present utility model in conjunction with the accompanying drawings.

[0033] Embodiment 1

[0034] Referring to Figures 1 to 7 , the present utility model provides a hybrid magnetic levitation bearing, including: a stator 1 and a rotor 2.

[0035] Among them, the stator 1 includes a stator core 11, at least two stator magnetic rings 12 and a plurality of coils 13. The stator core 11 is provided with a stator ring 111 and a plurality of stator teeth 112 that are radially arranged and evenly distributed in a ring shape on the inner wall of the stator ring 111, and the plurality of coils 13 are respectively wound around the plurality of stator teeth 112.

[0036] Furthermore, at least one stator magnetic ring 12 is coaxially installed at both the upper and lower ends of the stator ring 111. As Figure 2 and Figure 3 shown, in this embodiment, the stator magnetic rings 12 installed at both the upper and lower ends of the stator ring 111 are both one. The two stator magnetic rings 12 are both fixedly connected to the stator ring 111, and the fixing method can be, but is not limited to, bonding, etc.

[0037] Of course, in other embodiments of the present utility model, a plurality of stacked stator magnetic rings 12 can also be fixedly installed at each end of the stator ring 111.

[0038] Preferably, the outer diameters and ring widths of the two stator magnetic rings 12 are the same as those of the stator ring 111, ensuring the compactness of the overall structure of the stator 1.

[0039] Referring to Figure 1 and Figure 2, the rotor 2 is annular, movably arranged inside the stator 1 and in clearance fit with the stator 1. An annular rotor tooth 201 is provided on the outer peripheral surface of the rotor 2, and a plurality of stator teeth 112 are all arranged radially opposite to the rotor tooth 201. When the coil 13 on any stator tooth 112 is energized, a radial suction force can be generated between the magnetized stator tooth 112 and the rotor 2.

[0040] Among them, the two stator magnetic rings 12 located at the upper and lower ends of the stator ring 111 are both magnetized axially, and the magnetization directions of the two stator magnetic rings 12 are opposite, so that a closed magnetic circuit can be formed between the stator magnetic rings 12, the stator iron core 11 and the rotor 2.

[0041] The radial force on the rotor 2 of the hybrid magnetic levitation bearing of the present utility model is mainly controlled by the permanent magnetic force of the stator magnetic ring 12. The permanent magnetic forces generated by the two stator magnetic rings 12 at the upper and lower ends of the stator iron core 11 converge into the stator iron core 11 to form a main magnetic path. The main magnetic flux passes through the stator teeth 112 on the stator iron core 11, passes through the air gap between the stator iron core 11 and the rotor 2, and is transmitted to the rotor 2 through the rotor teeth 201, and finally returns to the stator magnetic ring 12 again, so that a closed magnetic circuit can be formed between the upper and lower stator magnetic rings 12, the stator iron core 11 and the rotor 2. The permanent magnetic force generated by the stator magnetic ring 12 on the rotor 2 is relied on to drive the rotor 2 to levitate radially. At the same time, by controlling the direction and magnitude of the current of the coil 13, the attraction force of the stator tooth 112 on the rotor 2 is controlled, and this is used as an auxiliary control force. When the rotor 2 is radially displaced due to interference, the Hall sensor detects the displacement amount and feeds it back to the control system. The control system controls the current of one or more coils 13 on the side closer to the rotor 2 to decrease, so as to reduce the attraction force of the stator tooth 112 on the rotor tooth 201 of the rotor 2, or changes the current direction of the coil 13 to generate a magnetic field opposite to the direction of the main magnetic path, further reducing the attraction force of the stator tooth 112 on the rotor 2. At the same time, the current direction and magnitude of one or more coils 13 on the farther side can also be controlled to generate a magnetic field in the same direction as the main magnetic path to increase the attraction force of the stator tooth 112 on the rotor 2 until the Hall sensor detects that the rotor 2 is in the radially centered position, the current directions of the coils 13 are the same, and the current decreases to a continuous current that can keep the rotor 2 stable.

[0042] The axial force on the rotor 2 of the hybrid magnetic levitation bearing of the present utility model is controlled by the permanent magnetic force of the stator magnetic ring 12, that is, by the mutual attraction force between the stator teeth 112 of the stator iron core 11 and the rotor teeth 201 of the rotor 2. When the rotor 2 generates an axial displacement, in order to ensure that the pole facing area between the stator teeth 112 and the rotor teeth 201 remains unchanged during the magnetic path transmission process, the stator 1 has a permanent magnetic force that pulls the rotor 2 axially in the direction of restoring to the origin. Whether the rotor 2 is axially upward or axially downward, an axial force that restores to the origin will be generated.

[0043] It can be seen that the hybrid magnetic levitation bearing of the present utility model adopts the form of combining permanent magnet and electromagnetic, and uses the permanent magnet force of the stator magnetic ring 12 to provide a static bias magnetic field. At the same time, the electromagnet composed of the stator teeth 112 and the coil 13 of the stator is used as the dynamic suspension auxiliary adjustment. It not only maintains the low-power consumption characteristics of the permanent magnet bearing, but also realizes high-precision suspension and adjustment through electromagnetic control, achieving five-degree-of-freedom suspension. It can not only reduce the bias current required for electromagnetic control, significantly reduce the power consumption of the system, making the bearing more advantageous in application scenarios that require long-term operation or limited energy supply, but also enables the bearing to have higher load-bearing capacity and better stability, and can adapt to various complex working conditions.

[0044] In addition, there has always been a contradiction between the power consumption and volume of magnetic levitation bearings at present, that is, when the power is low, the volume must be made very large; while when the volume is small, a higher power is required to maintain stable suspension, and the heat generation will increase accordingly.

[0045] In order to solve the above technical problems, the present utility model is provided with stator magnetic rings 12 at both the upper and lower ends of the stator core 11, and the stator magnetic rings 12 on both the upper and lower sides can form two closed magnetic circuits through the stator teeth 112 of the stator core 11 in the middle and the rotor teeth 201 of the rotor 2, making the magnetic force utilization rate higher. Under the same magnetic force requirement, the volume can be made smaller, the structure is more compact, and a stable static bias magnetic field can be provided. At the same time, the bias current required for electromagnetic control is small, thus realizing a five-degree-of-freedom permanent magnet bias magnetic bearing with low power consumption, small volume and light weight. For example, when the hybrid magnetic levitation bearing of the present utility model is used in a blood pump, it can achieve more efficient energy utilization and a more compact structural design on the premise of ensuring blood compatibility and long-term reliability, so as to improve the overall performance and clinical applicability of the blood pump.

[0046] Furthermore, the stator 1 further includes two annular stator yokes 14, the two stator yokes 14 are symmetrically distributed along the axial direction on both sides of the stator core 11, and the two stator yokes 14 are respectively fixed on one end of the two stator magnetic rings 12 facing away from each other. The stator yoke 14 extends radially inward with an annular inner convex tooth 141, and both ends of the rotor 2 extend radially outward with annular outer convex teeth 202. The outer convex teeth 202 and the corresponding inner convex teeth 141 are distributed radially opposite and in clearance fit to reduce the magnetic field air gap between the stator yoke 14 and the rotor 2 and improve the magnetic force conduction efficiency.

[0047] The permanent magnetic forces generated by the two stator magnetic rings 12 at the upper and lower ends of the stator core 11 converge into the stator core 11 to form a main magnetic path. The main magnetic flux path passes through the stator teeth 112 on the stator core 11, through the air gap between the stator core 11 and the rotor 2, and is transmitted to the rotor 2 through the rotor teeth 201. Then it is respectively transmitted towards the outer convex teeth 202 at the upper and lower ends of the rotor 2, and then passes through the air gap between the stator yoke 14 and the rotor 2 and is transmitted to the stator yoke 14. Finally, the upper and lower two stator yokes 14 respectively return to the corresponding two stator magnetic rings 12, so that a closed magnetic circuit can be jointly formed between the stator magnetic rings 12, the stator core 11, the rotor 2, and the stator yoke 14 located on the same axial side.

[0048] In the present utility model, by arranging the stator yokes 14 at the upper and lower ends of the stator core 11, the magnetic circuit structure can be enhanced, the magnetic force conduction efficiency can be improved, the magnetic force loss can be reduced, the static bias magnetic field provided by the stator magnetic rings 12 can be increased, the suspension stability effect can be improved, and at the same time, the power reduction effect is better.

[0049] It is worth mentioning that a plurality of rotor teeth 201 are arranged at intervals along the axial direction. In this embodiment, the rotor teeth 201 are specifically arranged as three; the inner side surface of each stator tooth 112 is provided with a plurality of tooth portions 1121 having the same number as the rotor teeth 201 and distributed in a one-to-one correspondence. Therefore, on the premise of ensuring that the pole facing area between the stator core 11 and the rotor 2 remains unchanged, by increasing the number of rotor teeth 201 and tooth portions 1121, it is beneficial to increase the magnitude of the axial force, and at the same time, a plurality of branch magnetic paths can be formed to further enhance the magnetic circuit structure.

[0050] In the present utility model, the number of stator teeth 112 is configured to be more than three, and the number of corresponding coils 13 is also configured to be more than three, preferably four to sixteen. In this embodiment, specifically four are adopted. The coils 13 wound on the four stator teeth 112 all work independently. Therefore, when the rotor 2 has a radial offset or deflection, the current direction and magnitude of the corresponding coil 13 can be independently controlled.

[0051] As Figure 5 shown, in this embodiment, the upper end of the upper stator magnetic ring 12 is an S pole and the lower end is an N pole, and the upper end of the lower stator magnetic ring 12 is an N pole and the lower end is an S pole. The permanent magnetic forces generated by the upper and lower stator magnetic rings 12 converge into the stator core 11 to form a main magnetic path. The main magnetic flux path passes through the stator teeth 112 on the stator core 11, through the air gap between the stator core 11 and the rotor 2, and is transmitted to the rotor 2 through the rotor teeth 201, and then returns to the stator magnetic ring 12 through the stator yoke 14. Thus, a closed magnetic circuit can be jointly formed between the upper and lower stator magnetic rings 12, the middle stator core 11, the rotor 2, and the stator yoke 14 (as Figure 5In the direction indicated by the arrow, without external force interference, the permanent magnetic force of the two stator magnetic rings 12 is relied on to provide a static bias magnetic field, so that the rotor 2 is in an absolutely dynamically levitated state axially and radially.

[0052] Of course, in other embodiments of the present invention, the magnetic pole directions of all the stator magnetic rings 12 can also be opposite.

[0053] As Figure 6 shown, when the rotor 2 is axially upwardly displaced due to external force interference, relying on the static bias magnetic field provided by the permanent magnetic force of the two stator magnetic rings 12, the stator teeth 112 and the stator yoke 14 of the stator core 11 both generate an axially downward attractive force on the rotor 2, so that the rotor 2 returns to the origin.

[0054] As Figure 7 shown, when the rotor 2 is radially displaced to the right due to external force interference, the Hall sensor detects the displacement and feeds it back to the control system. The control system controls the current of one coil 13 on the right to decrease, so as to reduce the attractive force of the stator teeth 112 on the rotor 2. If the current of one coil 13 on the right decreases to 0 and the rotor 2 is still displaced to the right, then the current direction of one coil 13 on the right is changed to generate a magnetic field opposite to the main magnetic path direction, further reducing the attractive force of the stator teeth 112 on the rotor 2. At the same time, the current direction and the current increase of one coil 13 on the left can also be controlled to generate a magnetic field in the same direction as the main magnetic path direction to increase the attractive force of the stator teeth 112 on the rotor 2. Until the Hall sensor detects that the rotor 2 is in the radially centered position, the current directions of the coils 13 are the same, and the current decreases to a continuous current that can keep the rotor 2 stable.

[0055] Embodiment 2

[0056] Refer to Figure 8 and Figure 9 This embodiment is different from Embodiment 1 in that: both the stator 1 and the rotor 2 are provided with two groups. The two groups of stators 1 are arranged and distributed axially, and the two groups of rotors 2 are also arranged and distributed axially, and the two groups of rotors 2 are correspondingly arranged in the two groups of stators 1.

[0057] The present invention provides a static bias magnetic field by setting two groups of stators 1 and two groups of rotors 2, relying on the permanent magnetic force of the four stator magnetic rings 12, further improving the suspension stability of the rotor 2 axially and radially, and having a better constraint effect on the axial and radial degrees of freedom, especially the radial deflection degree of freedom.

[0058] As Figure 9As shown, when the rotor 2 deflects radially, the rotor 2 deflects clockwise by a certain angle. The upper end of the rotor 2 is closer to a stator tooth 112 in the upper right, and the lower end of the rotor 2 is closer to a stator tooth 112 in the lower left. The Hall sensor detects the offset of the rotor 2 and feeds it back to the control system. The control system controls the current of a coil 13 in the upper right to decrease, so as to reduce the attraction force of the stator tooth 112 in the upper right on the rotor 2. When the current of a coil 13 in the upper right decreases to 0, if the rotor 2 is still deflecting clockwise, then change the current direction of a coil 13 in the upper right to generate a magnetic field opposite to the direction of the main magnetic path, further reducing the attraction force of the stator tooth 112 in the upper right on the rotor 2. At the same time, the control system controls the current of a coil 13 in the lower left to decrease, so as to reduce the attraction force of the stator tooth 112 in the lower left on the rotor 2. Similarly, when the current of a coil 13 in the lower left decreases to 0 and the rotor 2 is still deflecting clockwise, then change the current direction of a coil 13 in the lower left to generate a magnetic field opposite to the direction of the main magnetic path, further reducing the attraction force of the stator tooth 112 in the lower left on the rotor 2. At the same time, the current directions of the coils 13 in the upper left and lower right can also be controlled and the current increased to generate a magnetic field in the same direction as the main magnetic path, so as to increase the attraction forces of the stator teeth 112 in the upper left and lower right on the rotor 2. Until the Hall sensor detects that the rotor 2 is in the radially centered position, the current directions of the coils 13 are the same, and the current decreases to a continuous current that can keep the rotor 2 stable.

[0059] It is worth mentioning that non-magnetic washers 3 are fixedly connected between the two groups of stators 1 and the two groups of rotors 2. Through the non-magnetic washers 3, the interference between the two groups of stators 1 and the two groups of rotors 2 can be effectively prevented.

[0060] Embodiment 3

[0061] The difference between this embodiment and Embodiment 1 or Embodiment 2 is that: the stator core 11 is provided with eight stator teeth 112 distributed at equal intervals in a ring shape along the inner wall of the stator ring 111, and each of the eight stator teeth 112 is wound with an independently controllable coil 13. By independently controlling the eight coils 13, a more stable auxiliary control radial suspension effect can be provided.

[0062] It can be seen that the hybrid magnetic levitation bearing of the present utility model adopts a form of combination of permanent magnet and electromagnetic, and uses the permanent magnet force of the stator magnetic ring 12 to provide a static bias magnetic field. At the same time, the electromagnet composed of the stator teeth 112 and the coil 13 is used as a dynamic suspension auxiliary adjustment. It not only maintains the low-power consumption characteristics of the permanent magnet bearing, but also realizes high-precision suspension and adjustment through electromagnetic control, achieving five-degree-of-freedom suspension. It can not only reduce the bias current required for electromagnetic control, significantly reduce the power consumption of the system, making the bearing more advantageous in application scenarios that require long-term operation or limited energy supply, but also enables the bearing to have higher load-bearing capacity and better stability, and can adapt to various complex working conditions; by arranging stator magnetic rings 12 at both the upper and lower ends of the stator iron core 11, and the stator magnetic rings 12 on the upper and lower sides can form two closed magnetic circuits through the stator teeth 112 of the stator iron core 11 in the middle and the rotor teeth 201 of the rotor 2, making the magnetic force utilization rate higher. Under the same magnetic force requirement, the volume can be made smaller, the structure is more compact, and a stable static bias magnetic field can be provided. At the same time, the bias current required for electromagnetic control is small, thus realizing a five-degree-of-freedom permanent magnet bias magnetic bearing with low power consumption, small volume and light weight; when used in a magnetic levitation blood pump, on the premise of ensuring blood compatibility and long-term reliability, it can realize more efficient energy utilization and a more compact structural design to improve the overall performance and clinical applicability of the blood pump.

[0063] Many specific details have been set forth in the above description to facilitate a full understanding of the present utility model. However, the above description is only a preferred embodiment of the present utility model, and the present utility model can be implemented in many other ways different from those described herein. Therefore, the present utility model is not limited by the specific embodiments disclosed above. At the same time, any person skilled in the art can make many possible changes and modifications to the technical solution of the present utility model, or modify it into an equivalent embodiment with equivalent changes, without departing from the scope of the technical solution of the present utility model. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model without departing from the content of the technical solution of the present utility model shall still fall within the scope of protection of the technical solution of the present utility model.

Claims

1. A hybrid magnetic bearing, characterized in that: include: A stator (1), the stator (1) comprising a stator core (11), at least two stator magnetic rings (12) and a plurality of coils (13); the stator core (11) is provided with a stator ring (111) and a plurality of stator teeth (112) radially and annularly distributed at equal intervals on the inner wall of the stator ring (111); the plurality of coils (13) are wound around the plurality of stator teeth (112) in a one-to-one correspondence; and at least one stator magnetic ring (12) is coaxially mounted at both ends of the stator ring (111); A rotor (2), the rotor (2) being arranged in the stator (1) and being loosely matched with the stator (1), an annular rotor tooth (201) being arranged on the outer peripheral surface of the rotor (2), and a plurality of stator teeth (112) being arranged radially opposite to the rotor teeth (201); The stator magnetic rings (12) located at both ends of the stator ring (111) are magnetized along the axial direction and in opposite directions, so that a closed magnetic circuit can be formed between the stator magnetic ring (12) and the stator core (11) and the rotor (2).

2. The hybrid magnetic bearing according to claim 1, characterized in that: The stator (1) further comprises two stator yokes (14), the two stator yokes (14) are symmetrically distributed on both sides of the stator core (11) along the axial direction, and the two stator yokes (14) are respectively fixed on the ends of the two stator magnetic rings (12) facing away from each other.

3. The hybrid magnetic bearing according to claim 2, characterized in that: The stator yoke (14) has an annular inner convex tooth (141) extending radially inward, and both ends of the rotor (2) have an annular outer convex tooth (202) extending radially outward. The outer convex tooth (202) and the corresponding inner convex tooth (141) are distributed relative to each other in the radial direction and are clearance-matched.

4. The hybrid magnetic bearing according to claim 1, characterized in that: The rotor teeth (201) are provided with a plurality of teeth arranged and distributed in an axial direction at intervals, and the inner side surface of the stator teeth (112) is provided with a plurality of tooth portions (1121) which are the same in number as the rotor teeth (201) and are distributed one by one in opposition to each other.

5. The hybrid magnetic bearing according to claim 1 or 2, characterized in that: The stator (1) and the rotor (2) are both provided with two groups arranged and distributed along the axial direction.

6. The hybrid magnetic bearing according to claim 5, characterized in that: Non-magnetic washers (3) are fixedly connected between the two groups of stators (1) and the two groups of rotors (2).

7. The hybrid magnetic bearing according to claim 1, characterized in that: The coils (13) wound around each stator tooth (112) work independently.

8. The hybrid magnetic bearing according to claim 1, characterized in that: The number of the stator teeth (112) is configured to be more than three, and the number of the corresponding coils (13) is also configured to be more than three.

9. The hybrid magnetic bearing according to claim 1, characterized in that: The rotor (2) is ring-shaped.

Images