Magnetic bearing system, magnetic bearing system control method, and electric device

Abstract

The application relates to a magnetic bearing system, a magnetic bearing system control method and an electric device, which can solve the problem that a magnetic bearing system in the prior art has a large design difficulty, a large structure size and a large manufacturing cost due to adoption of two sets of independent coil mechanisms. The magnetic bearing system comprises a fixed frame, a rotating shaft, a permanent magnet and a stator winding. The rotating shaft is arranged in the fixed frame and has a shoulder in the radial direction of the axis of the rotating shaft. The fixed frame has a suspension cavity, the permanent magnet is fixed in the suspension cavity and is arranged around the axis of the rotating shaft, and the rotating shaft is suspended in the suspension cavity under the magnetic action of the permanent magnet. The number of the stator windings is at least four, each stator winding is uniformly arranged along the circumferential direction of the rotating shaft around the axis, the stator winding comprises a stator tooth and a coil, the stator tooth has a suspension groove, the shoulder is accommodated in the suspension groove in the radial direction of the rotating shaft, and the coil is arranged around the stator tooth and is arranged opposite to the shoulder in the radial direction.

Description

Technical Field

[0001] The present application relates to the field of magnetic levitation technology, and in particular to a magnetic bearing system, a magnetic bearing system control method, and electrical equipment. Background Art

[0002] The development of magnetic levitation technology has led to the emergence of magnetic bearings. These bearings are generally used in high-speed rotating mechanical equipment, providing frictionless support and stable suspension. They are widely used in high-precision and demanding equipment such as flywheel energy storage, turbines, vacuum equipment, and generators. In magnetic bearing systems, the radial and axial suspension positions of rotating bodies must be precisely controlled.

[0003] In the related art, radial adjustment coils and axial adjustment coils are usually used to control the position of the rotating body in the radial direction and the axial direction respectively.

[0004] However, the use of two independent coil mechanisms in related technologies is difficult in design, has a large structural volume and high manufacturing cost, which is not conducive to the development of magnetic bearing systems towards miniaturization, high efficiency and intelligence. Summary of the Invention

[0005] Based on this, it is necessary to provide a magnetic bearing system, a magnetic bearing system control method and electrical equipment to address the problems of high design difficulty, structural volume and manufacturing cost of the magnetic bearing system in the related technology using two independent coil mechanisms.

[0006] According to one aspect of the present application, the present application provides a magnetic bearing system, comprising:

[0007] Fixed frame;

[0008] A rotating shaft, the rotating shaft passing through the fixing frame, the rotating shaft having a radial shoulder around its axis;

[0009] A permanent magnet, the fixing frame having a suspension cavity, the permanent magnet being fixed in the suspension cavity and arranged around the axis of the rotating shaft, and the rotating shaft being suspended in the suspension cavity under the magnetic effect of the permanent magnet;

[0010] Stator windings, the number of which is at least 4, each of which is evenly arranged around the axis along the circumference of the rotating shaft, the stator windings including stator teeth and coils, the stator teeth having suspension slots, the bosses being received in the suspension slots along the radial direction of the rotating shaft, the coils being wound around the stator teeth and arranged opposite to the bosses along the radial direction.

[0011] The aforementioned magnetic bearing system, through the provision of permanent magnets, enables the rotating shaft to levitate within the levitation chamber under the magnetic effect of the permanent magnets. Furthermore, by providing coils wound around the connecting portion, when the radial or axial position of the rotating shaft needs to be adjusted, the radial or axial position of the rotating shaft can be adjusted simply by passing a current of a preset direction through the coils of each stator winding. Therefore, the aforementioned magnetic bearing system can adjust the radial or axial position of the rotating shaft in real time simply by controlling the flow direction of the current in a single coil of each stator winding. This simple and reliable structure reduces design complexity, while also helping to reduce the size of the magnetic bearing system and control manufacturing costs.

[0012] In one embodiment, the stator teeth include a first tooth and a second tooth arranged in parallel and spaced apart, and a connecting portion connecting the first tooth and the second tooth, the coil is wound around the connecting portion, and the first tooth, the second tooth and the connecting portion form the suspension slot.

[0013] In one embodiment, the length of the first tooth is greater than the length of the second tooth; the first tooth has a radial air gap with the rotating shaft along the radial direction, the first tooth forms a first axial air gap with the boss along the axial direction of the rotating shaft, and the second tooth forms a second axial air gap with the boss along the axial direction.

[0014] In one embodiment, the first axial air gap is larger than the second axial air gap.

[0015] In one embodiment, the magnetic bearing system includes a support frame, which is disposed in the suspension chamber and arranged around the axis along the circumference of the rotating shaft, and the suspension slot of each stator tooth is clamped to the support frame.

[0016] In one embodiment, the magnetic bearing system includes a magnetic conductive member, which is sandwiched between the permanent magnet and the stator teeth.

[0017] In one embodiment, the fixing frame includes an end ring and a bottom bracket, the end ring abuts against the side of the permanent magnet facing away from the stator teeth along the axial direction of the rotating shaft, and the bottom bracket abuts against the side of the stator teeth facing away from the permanent magnet along the axial direction.

[0018] In one embodiment, the magnetic bearing system further includes a sensor, a power amplifier and a controller, wherein the sensor is connected between the rotating shaft and the stator teeth, the controller is electrically connected to the sensor and the power amplifier, and the power amplifier is electrically connected to the coil.

[0019] According to another aspect of the present application, the present application provides a magnetic bearing system control method, which uses the magnetic bearing system as described above, including the following steps:

[0020] Start the sensor, power amplifier and controller, and energize the coil at the same time;

[0021] The sensor detects the position of the rotating shaft relative to the stator teeth along its axial direction and radial direction;

[0022] When the sensor detects that the rotating shaft deviates from the preset axial position range along the axial direction, the controller controls the power amplifier to adjust the flow direction of the current in each of the coils so that the same direction of current flows through the two diametrically opposite coils until the rotating shaft falls into the preset axial position range along the axial direction; and / or

[0023] When the sensor detects that the rotating shaft deviates from the preset radial position range along the radial direction, the controller controls the power amplifier to adjust the flow direction of the current in each coil, so that reverse current flows into the two radially opposite coils until the rotating shaft falls into the preset radial position range along the axial direction.

[0024] According to another aspect of the present application, the present application provides an electrical device, which includes the magnetic bearing system as described above; or, the electrical device applies the magnetic bearing system control method as described above to control the magnetic bearing system.

[0025] The above-mentioned magnetic bearing system control method and electrical equipment can adjust the radial or axial position of the rotating shaft in real time by simply controlling the flow direction of the current in a single coil of each stator winding. The structure is simple and reliable, which reduces the design difficulty and helps to reduce the volume of the electrical equipment and control manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 2 is a cross-sectional view of a magnetic bearing system in one embodiment of the present application.

[0027] Figure 2 for Figure 1 Exploded view of the magnetic bearing system shown with the coils omitted.

[0028] Figure 3 for Figure 2 Schematic diagram of the structure of the stator teeth of the magnetic bearing system shown.

[0029] Figure 4 Schematic diagram of the approximate distribution of magnetic flux lines of a permanent magnet in one embodiment of the present application.

[0030] Figure 5 This is a schematic diagram of the approximate distribution of magnetic flux lines when the magnetic bearing system is adjusted downward in an embodiment of the present application.

[0031] Figure 6This is a schematic diagram of the approximate distribution of magnetic flux lines when the magnetic bearing system is adjusted in the counter-rotating axis direction in one embodiment of the present application.

[0032] Figure 7 This is a schematic diagram of the approximate distribution of magnetic flux lines of the magnetic bearing system when the rotating shaft is adjusted to the left in one embodiment of the present application.

[0033] Figure 8 This is a schematic diagram of the approximate distribution of magnetic flux lines of the magnetic bearing system when the rotating shaft is adjusted clockwise in one embodiment of the present application.

[0034] Figure 9 Flowchart of a magnetic bearing system control method according to an embodiment of the present application

[0035] Explanation of Figure Numbers

[0036] 10. Magnetic bearing system; 11. Fixing frame; 11a. Suspension cavity; 111. End ring; 111a. Perforation; 112. Bottom bracket; 12. Rotating shaft; 12a. Axis; 121. Shoulder; 13. Permanent magnet; 14. Stator winding; 141. Stator tooth; 141a. Suspension slot; 142. Coil; x. Radial air gap; y1. First axial air gap; y2. Second axial air gap; 1411. First tooth; 1412. Second tooth; 1413. Connecting portion; 15. Support frame; 16. Magnetic conductive member. DETAILED DESCRIPTION

[0037] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0038] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0039] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0040] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0041] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0042] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0043] Considering that existing magnetic bearing systems usually use radial adjustment coils and axial adjustment coils to control the position of the rotating body in the radial and axial directions respectively, the use of two independent coil mechanisms has high design difficulty, structural volume and manufacturing cost, which is not conducive to the development of magnetic bearing systems towards miniaturization, high efficiency and intelligence. The present application provides a magnetic bearing system, a magnetic bearing system control method and electrical equipment, which not only does not require the use of two independent sets of coils, but also has a simple structure, low design difficulty, structural volume and manufacturing cost, and is easy to apply and promote.

[0044] Specifically, please refer to Figure 1 and Figure 2 One embodiment of the present application provides a magnetic bearing system 10, which may include a fixed frame 11, a rotating shaft 12, a permanent magnet 13, and a stator winding 14. The rotating shaft 12 is disposed through the fixed frame 11 and has a radial shoulder 121 around its axis 12a. The fixed frame 11 has a suspension cavity 11a, and a permanent magnet 13 is fixed in the suspension cavity 11a and arranged around the axis 12a of the rotating shaft 12. The rotating shaft 12 is suspended in the suspension cavity 11a under the magnetic effect of the permanent magnet 13. There are at least four stator windings 14 , each of which is evenly arranged circumferentially around the axis 12 a of the rotating shaft 12 . The stator winding 14 includes stator teeth 141 and coils 142 . The stator teeth 141 have suspension grooves 141 a , and the bosses 121 are received in the suspension grooves 141 a along the radial direction of the rotating shaft 12 . The coils 142 are wound around the stator teeth 141 and arranged opposite the bosses 121 along the radial direction of the rotating shaft 12 .

[0045] The magnetic bearing system 10, through the provision of the permanent magnet 13, enables the shaft 12 to be suspended within the suspension chamber 11a under the magnetic effect of the permanent magnet 13. Furthermore, by providing the coil 142 wound around the connection portion 1413, when the radial or axial position of the shaft 12 needs to be adjusted, the radial or axial position of the shaft 12 can be adjusted by simply passing a current of a preset direction through the coil 142 of each stator winding 14. Therefore, the magnetic bearing system 10 can adjust the radial or axial position of the shaft 12 in real time simply by controlling the direction of the current flowing through a single coil 142 of each stator winding 14. This simple and reliable structure reduces design complexity, while also helping to reduce the size of the magnetic bearing system 10 and control manufacturing costs.

[0046] For example, see Figure 4 The rotating shaft 12 is arranged in the vertical direction and has a downward gravity. The rotating shaft 12 is kept suspended in the suspension chamber 11a under the magnetic effect of the permanent magnet 13. The approximate distribution of the magnetic flux lines of the permanent magnet 13 is as follows: Figure 4 It is worth noting that Figure 4The example of two radially opposing stator windings 14 along the rotating shaft 12 is shown. It is understood that the magnetic bearing system 10 includes at least two pairs of radially opposing stator windings 14 around the axis 12a of the rotating shaft 12 and along the circumference of the rotating shaft 12. It should be noted that the aforementioned pair of radially opposing stator windings 14 refers to two stator windings 14 that are 180° opposite each other around the axis 12a. It is noteworthy that the boss 121 is received in the suspension slot 141a along the radial direction of the rotating shaft 12, such that the boss 121 and the stator tooth 141 have a first axial air gap y1 and a second axial air gap y2, respectively, in the axial direction, and the stator tooth 141 has a radial air gap x in the radial direction with respect to the rotating shaft 12.

[0047] For example, see Figure 5 When the rotating shaft 12 deflects upward during rotation, it is necessary to adjust the rotating shaft 12 downward. To do this, currents in the same direction can be passed through the two radially opposing coils 142, causing both coils 142 to generate an upward magnetic field (as determined by the right-hand screw rule). Analysis of the distribution of magnetic flux lines generated by the left and right coils 142 shows that, axially, the magnetic field of coils 142 suppresses the magnetic flux density between the boss 121 and the stator teeth 141 in the second axial air gap y2, while enhancing the magnetic flux density between the boss 121 and the stator teeth 141 in the first axial air gap y1. This generates a combined downward force on the rotating shaft 12. In this way, downward adjustment of the rotating shaft 12 along its axial direction is possible.

[0048] Furthermore, in the radial direction, the magnetic fields generated by the left and right coils 142 have the same magnitude and opposite directions in enhancing the magnetic flux density in the radial air gaps x on both sides. Therefore, the magnetic fields generated by the coils 142 in the radial direction have no driving effect on the position adjustment of the rotating shaft 12. Thus, by passing current in the same direction through the two radially opposing coils 142 and causing both coils 142 to generate upward magnetic fields, downward adjustment of the rotating shaft 12 can be achieved.

[0049] For example, see Figure 6 , when the rotating shaft 12 deviates downward during rotation, the rotating shaft 12 needs to be adjusted upward. In this way, the same-direction current can be passed through the two radially opposite coils 142 and the two coils 142 can generate a downward magnetic field. Analysis of the distribution of magnetic flux lines generated by the left and right coils 142 shows that in the axial direction, the magnetic field of the coil 142 enhances the magnetic density of the boss 121 and the stator teeth 141 in the second axial air gap y2, and suppresses the magnetic density of the boss 121 and the stator teeth 141 in the first axial air gap y1, thereby generating an upward resultant force on the rotating shaft 12. In this way, the rotating shaft 12 can be adjusted upward along its axial direction.

[0050] Furthermore, in the radial direction, the magnetic fields generated by the left and right coils 142 exert a magnetic flux density suppression effect on the radial air gaps x of equal magnitude and in opposite directions. Therefore, they have no driving effect on radial position adjustment of the rotating shaft 12. Thus, by passing current in the same direction through the two radially opposing coils 142 and causing both coils 142 to generate downward magnetic fields, downward adjustment of the rotating shaft 12 can be achieved.

[0051] For example, see Figure 7 , when the rotating shaft 12 deviates to the right during rotation, the rotating shaft 12 needs to be adjusted to the left. In this way, opposite currents can be passed through the two radially opposite coils 142 and the two coils 142 can generate magnetic fields with one side facing upward and the other side facing downward respectively. Analysis of the distribution of magnetic flux lines generated by the left and right coils 142 shows that in the radial direction, the magnetic field generated by the left coil 142 has a magnetic flux enhancement effect in the radial air gap x on the left, and the magnetic field generated by the right coil 142 has a magnetic flux suppression effect in the radial air gap x on the right, thereby generating a resultant force to the left on the rotating shaft 12. In this way, the rotating shaft 12 can be adjusted to the left along its radial direction.

[0052] In addition, in the axial direction, the magnetic field generated by the left coil 142 has a magnetic flux enhancement effect in the first axial air gap y1 on the left and a magnetic flux suppression effect in the second axial air gap y2 on the left. In the axial direction, the magnetic field generated by the right coil 142 has a magnetic flux suppression effect in the first axial air gap y1 on the right and a magnetic flux enhancement effect in the second axial air gap y2 on the right. Therefore, in the axial direction, the magnetic flux effects on the left and right sides are of the same magnitude and opposite directions, and therefore have no driving effect on the position adjustment of the rotating shaft 12 in the axial direction. In this way, by passing opposite currents through the two radially opposite coils 142 and causing the two coils 142 to generate magnetic fields with one side pointing upward and the other side pointing downward, respectively, the rotating shaft 12 can be adjusted to the left.

[0053] For example, see Figure 8 , when the rotating shaft 12 deviates to the left during rotation, the rotating shaft 12 needs to be adjusted to the right. In this way, opposite currents can be passed through the two radially opposite coils 142 and the two coils 142 can generate magnetic fields with one side pointing downward and the other side pointing upward, respectively. Analysis of the distribution of magnetic flux lines generated by the left and right coils 142 shows that in the radial direction, the magnetic field generated by the left coil 142 has a magnetic density suppression effect in the radial air gap x on the left, and the magnetic field generated by the right coil 142 has a magnetic density enhancement effect in the radial air gap x on the right, thereby generating a resultant force to the right on the rotating shaft 12. In this way, the rotating shaft 12 can be adjusted to the right along its radial direction.

[0054] In addition, in the axial direction, the magnetic field generated by the left coil 142 has a magnetic flux suppression effect in the first axial air gap y1 on the left, and a magnetic flux enhancement effect in the second axial air gap y2 on the left. In the axial direction, the magnetic field generated by the right coil 142 has a magnetic flux enhancement effect in the first axial air gap y1 on the right, and a magnetic flux suppression effect in the second axial air gap y2 on the right. Therefore, in the axial direction, the magnetic flux effects on the left and right sides are of equal magnitude and opposite directions, and therefore have no driving effect on the axial position adjustment of the rotating shaft 12. In this way, by passing opposite currents through the two radially opposite coils 142 and causing the two coils 142 to generate magnetic fields with one side pointing downward and the other side pointing upward, respectively, the rotating shaft 12 can be adjusted to the right.

[0055] Optionally, combined Figure 3 As shown, the stator teeth 141 may include a first tooth 1411 and a second tooth 1412 arranged in parallel and spaced apart, and a connecting portion 1413 connecting the first tooth 1411 and the second tooth 1412. The coil 142 is wound around the connecting portion 1413. The first tooth 1411, the second tooth 1412 and the connecting portion 1413 form a suspension groove 141a. The suspension groove 141a is used to position the boss 121 of the rotating shaft 12.

[0056] Optionally, the extension axis 12a of the connecting portion 1413 can be parallel to the axis 12a of the rotating shaft 12, so as to improve the balance of the magnetic field effect of each stator winding 14 on the rotating shaft 12 in the circumferential direction around the axis 12a of the rotating shaft 12, thereby improving the effect of axial or radial position adjustment of the rotating shaft 12.

[0057] Optionally, combined Figure 1 and Figure 3 As shown, the length of the first tooth 1411 is greater than the length of the second tooth 1412; the first tooth 1411 has a radial air gap x with the rotating shaft 12 along the radial direction of the rotating shaft 12, the first tooth 1411 forms a first axial air gap y1 with the boss 121 along the axial direction of the rotating shaft 12, and the second tooth 1412 forms a second axial air gap y2 with the boss 121 along the axial direction of the rotating shaft 12.

[0058] It is worth noting that by making the length of the first tooth 1411 greater than the length of the second tooth 1412, the gap between the first tooth 1411 and the rotating shaft 12 is smaller than the gap between the second tooth 1412 and the rotating shaft 12. Then, along the radial direction of the rotating shaft, the radial position of the rotating shaft is adjusted mainly by affecting the magnetic density of the radial air gap x between the first tooth 1411 and the rotating shaft.

[0059] Optionally, the first axial air gap y1 is larger than the second axial air gap y2 , so that the coil 142 can enhance or suppress the magnetic flux density of the first axial air gap y1 and the second axial air gap y2 .

[0060] It can be understood that the length of the first tooth 1411 of this embodiment is greater than the length of the second tooth 1412, so the projected area of ​​the first tooth 1411 on the boss 121 is greater than the projected area of ​​the second tooth 1412 on the boss 121. Therefore, if the first axial air gap y1 and the second axial air gap y2 are equal, the magnetic density of the first axial air gap y1 must be greater than the magnetic density of the second axial air gap y2.

[0061] Therefore, this embodiment adaptively increases the first axial air gap y1 relative to the second axial air gap y2 , which helps to balance the magnetic flux density changes of the first axial air gap y1 and the second axial air gap y2 , thereby helping to improve the accuracy of magnetic flux density adjustment.

[0062] Optionally, combined Figure 1 and Figure 2 As shown, the magnetic bearing system 10 may include a support frame 15, which is arranged in a suspension cavity 11a of the fixed frame 11. The support frame 15 is arranged along the circumference of the rotating shaft 12 around the axis 12a of the rotating shaft 12, and the suspension groove 141a of each stator tooth 141 is clamped to the support frame 15, so that each stator tooth 141 can be stably clamped and fixed, and each stator tooth 141 is located on the same plane, which helps to improve the position adjustment effect of each stator winding 14 on the rotating shaft 12.

[0063] Optionally, combined Figure 1 and Figure 2 As shown, the magnetic bearing system 10 may include a magnetic conductive member 16 , which is sandwiched between the permanent magnet 13 and the stator teeth 141 , thereby helping to improve the magnetic force transmission effect and further enhance the position adjustment effect of each stator winding 14 on the rotating shaft 12 .

[0064] Optionally, combined Figure 1 and Figure 2 As shown, the fixing frame 11 may include an end ring 111 and a bottom bracket 112. The end ring 111 abuts against the side of the permanent magnet 13 away from the stator tooth 141 along the axial direction of the rotating shaft 12, and the bottom bracket 112 abuts against the side of the stator tooth 141 away from the permanent magnet 13 along the axial direction of the rotating shaft 12. This helps to improve the compactness of the structure and the ease of assembly.

[0065] Optionally, the end ring 111 has a through-hole 111a, which is used for the rotating shaft 12 to pass through. In this way, when assembling the magnetic bearing system 10, it is only necessary to pass one end of the rotating shaft 12 through the through-hole 111a, then install the stator winding 14, and finally abut the bottom bracket 112 against the side of the stator winding 14 away from the permanent magnet 13. The installation process is simple, fast and reliable.

[0066] Optionally, the magnetic bearing system 10 may include a sensor (not shown), a power amplifier (not shown) and a controller (not shown), the sensor being connected between the rotating shaft 12 and the stator teeth 141 , the controller being electrically connected to both the sensor and the power amplifier, and the power amplifier being electrically connected to the coil 142 .

[0067] Specifically, by adding sensors, power amplifiers and controllers, the magnetic bearing system 10 can be used in various scenarios where the rotating shaft 12 needs to be suspended, such as applying the magnetic bearing system 10 to high-precision and high-requirement equipment such as flywheel energy storage, turbines, vacuum equipment, generators, etc., thereby improving the applicability of the magnetic bearing system 10.

[0068] See also Figure 9 According to another aspect of the present application, the present application further provides a magnetic bearing system control method, which uses the above-mentioned magnetic bearing system 10 and includes the following steps:

[0069] S1, start the sensor, power amplifier and controller, and energize the coil 142 at the same time;

[0070] S2. Detecting the position of the rotating shaft 12 relative to the stator teeth 141 along its axial and radial directions through sensors;

[0071] S3. When the sensor detects that the rotating shaft 12 deviates from the preset axial position range in the axial direction, the controller controls the power amplifier to adjust the flow direction of the current in each coil 142, so that the same direction current flows into the two radially opposite coils 142 until the rotating shaft 12 falls into the preset axial position range in the axial direction; and / or, when the sensor detects that the rotating shaft 12 deviates from the preset radial position range in the radial direction, the controller controls the power amplifier to adjust the flow direction of the current in each coil 142, so that the opposite direction current flows into the two radially opposite coils 142 until the rotating shaft 12 falls into the preset radial position range in the axial direction.

[0072] According to another aspect of the present application, the present application further provides an electrical device, which includes the above-mentioned magnetic bearing system 10; or, the electrical device applies the above-mentioned magnetic bearing system control method to control the magnetic bearing system 10.

[0073] The above-mentioned magnetic bearing system control method and electrical equipment can adjust the radial or axial position of the rotating shaft 12 in real time by simply controlling the flow direction of the current in a single coil 142 of each stator winding 14. The structure is simple and reliable, which reduces the design difficulty and helps to reduce the volume of the electrical equipment and control manufacturing costs.

[0074] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A magnetic bearing system, characterized in that: The magnetic bearing system comprises: Fixed frame; A rotating shaft, the rotating shaft passing through the fixing frame, the rotating shaft having a radial shoulder around its axis; A permanent magnet, the fixing frame having a suspension cavity, the permanent magnet being fixed in the suspension cavity and arranged around the axis of the rotating shaft, and the rotating shaft being suspended in the suspension cavity under the magnetic effect of the permanent magnet; stator windings, the number of which is at least four, each of which is evenly arranged around the axis and along the circumference of the rotating shaft, the stator windings comprising stator teeth and coils, the stator teeth having suspension slots, the bosses being received in the suspension slots along the radial direction of the rotating shaft, the coils being wound around the stator teeth and arranged opposite the bosses along the radial direction; The stator teeth include a first tooth and a second tooth arranged in parallel and spaced apart, and a connecting portion connecting the first tooth and the second tooth, the coil is wound around the connecting portion, and the first tooth, the second tooth and the connecting portion form the suspension slot; The length of the first tooth is greater than that of the second tooth; the first tooth has a radial air gap with the rotating shaft along the radial direction, the first tooth forms a first axial air gap with the boss along the axial direction of the rotating shaft, and the second tooth forms a second axial air gap with the boss along the axial direction of the rotating shaft; The first axial air gap is larger than the second axial air gap.

2. The magnetic bearing system according to claim 1, characterized in that The magnetic bearing system includes a support frame, which is arranged in the suspension cavity and is arranged around the axis along the circumference of the rotating shaft. The suspension groove of each stator tooth is clamped to the support frame.

3. The magnetic bearing system according to claim 1, characterized in that The magnetic bearing system includes a magnetic conductive member, which is sandwiched between the permanent magnet and the stator teeth.

4. The magnetic bearing system according to claim 1, characterized in that The fixing frame includes an end ring and a bottom bracket. The end ring abuts against the side of the permanent magnet away from the stator teeth along the axial direction of the rotating shaft, and the bottom bracket abuts against the side of the stator teeth away from the permanent magnet along the axial direction of the rotating shaft.

5. The magnetic bearing system according to any one of claims 1 to 4, characterized in that: The magnetic bearing system further includes a sensor, a power amplifier and a controller. The sensor is connected between the rotating shaft and the stator teeth. The controller is electrically connected to the sensor and the power amplifier. The power amplifier is electrically connected to the coil.

6. A method for controlling a magnetic bearing system, using the magnetic bearing system according to claim 5, characterized in that: The steps include: Start the sensor, power amplifier and controller, and energize the coil at the same time; The sensor detects the position of the rotating shaft relative to the stator teeth along its axial direction and radial direction; When the sensor detects that the rotating shaft deviates from the preset axial position range along the axial direction, the controller controls the power amplifier to adjust the flow direction of the current in each of the coils so that the same direction of current flows through the two diametrically opposite coils until the rotating shaft falls into the preset axial position range along the axial direction; and / or When the sensor detects that the rotating shaft deviates from the preset radial position range along the radial direction, the controller controls the power amplifier to adjust the flow direction of the current in each coil, so that reverse current flows into the two radially opposite coils until the rotating shaft falls into the preset radial position range along the axial direction.

7. An electrical device, characterized in that: The electrical equipment includes the magnetic bearing system according to claim 5; or, the electrical equipment applies the magnetic bearing system control method according to claim 6 to control the magnetic bearing system.

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