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

Abstract

The invention relates to a magnetic bearing system, a magnetic bearing system control method and electric equipment. The problems that in the prior art, two independent coil mechanisms are adopted in a magnetic bearing system, and the design difficulty, the structural size and the manufacturing cost are large can be solved. The magnetic bearing system comprises a fixing frame; the rotating shaft penetrates through the fixing frame and is provided with a convex shoulder in the radial direction of the axis of the rotating shaft; the fixing frame is provided with a suspension cavity, the permanent magnet is fixed in the suspension cavity and 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, the stator windings are uniformly arranged around the axis along the circumferential direction of the rotating shaft, each stator winding comprises stator teeth and a coil, the stator teeth are provided with suspension grooves, the shoulders are accommodated in the suspension grooves along the radial direction of the rotating shaft, and the coils are wound on the stator teeth and are arranged opposite to the shoulders along 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] With the development of magnetic suspension technology, magnetic bearings have emerged. Magnetic bearings are generally used in high-speed rotating mechanical equipment. They can provide frictionless support and stable suspension for the equipment. They are widely used in high-precision and high-demand equipment such as flywheel energy storage, turbines, vacuum equipment, generators, etc. In the magnetic bearing system, the radial and axial suspension positions of the rotating body need to 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 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. 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 using two independent coil mechanisms in the magnetic bearing system in the related technology.

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

[0007] Fixed frame;

[0008] A rotating shaft, the rotating shaft is passed through the fixing frame, and the rotating shaft has a convex shoulder in the radial direction around its axis;

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

[0010] The stator winding includes at least four stator windings, each of which is evenly arranged around the axis along the circumference of the rotating shaft. The stator winding includes stator teeth and coils. The stator teeth have suspension grooves. The bosses are accommodated in the suspension grooves along the radial direction of the rotating shaft. The coils are wound around the stator teeth and arranged opposite to the bosses along the radial direction.

[0011] The above-mentioned magnetic bearing system, through the arrangement of permanent magnets, realizes the suspension of the rotating shaft in the suspension chamber under the magnetic effect of the permanent magnets. In addition, through the arrangement of the coils wound around the connecting parts, when the radial or axial position of the rotating shaft needs to be adjusted, it is only necessary to pass a current of a preset flow direction into the coils of each stator winding to achieve the adjustment of the radial or axial direction of the rotating shaft. Therefore, the above-mentioned magnetic bearing system can adjust the radial or axial position of the rotating shaft in real time only by controlling the flow direction of the current of a single coil of each stator winding. The structure is simple and reliable, which reduces the design difficulty and helps to compress the volume of the magnetic bearing system and control the manufacturing cost.

[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 of the embodiments, the magnetic bearing system includes a support frame, the support frame is disposed in the suspension chamber, the support frame is disposed around the axis along the circumference of the rotating shaft, and the suspension groove of each stator tooth is clamped to the support frame.

[0016] In one of the embodiments, the magnetic bearing system includes a magnetic conductive member, and the magnetic conductive member is sandwiched between the permanent magnet and the stator tooth.

[0017] In one embodiment, the fixing frame includes an end ring and a bottom bracket, the end ring abuts against a side of the permanent magnet away from the stator tooth along the axial direction of the rotating shaft, and the bottom bracket abuts against a side of the stator tooth 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 at the same time, 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, using the magnetic bearing system as described above, comprising 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 current flows through the two radially 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 through 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 uses 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 only by controlling the flow direction of the current of 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 the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0027] FIG. 2 is an exploded view of the magnetic bearing system shown in FIG. 1 with the coil omitted.

[0028] FIG. 3 is a schematic structural diagram of the stator teeth of the magnetic bearing system shown in FIG. 2 .

[0029] FIG. 4 is a schematic diagram showing the approximate distribution of magnetic flux lines of a permanent magnet in an embodiment of the present application.

[0030] FIG. 5 is a schematic diagram showing the approximate distribution of magnetic flux lines of the magnetic bearing system when the counter-rotating shaft is adjusted downward in one embodiment of the present application.

[0031] FIG6 is a schematic diagram showing 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] FIG. 7 is a schematic diagram showing 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] FIG8 is a schematic diagram showing the approximate distribution of magnetic flux lines of the magnetic bearing system when the rotating shaft is adjusted to the right in one embodiment of the present application.

[0034] FIG. 9 is a flow chart of a method for controlling a magnetic bearing system in an embodiment of the present application.

[0035] Description of Figure Numbers

[0036] 10. Magnetic bearing system; 11. Fixed 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 part; 15. Support frame; 16. Magnetic conductive member. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0038] In the description of the present 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 the present 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 the present application.

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

[0040] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it 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. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in 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 a central 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 a central element at the same time. 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 implementation method.

[0043] Considering that the existing magnetic bearing system usually uses radial adjustment coils and axial adjustment coils to control the position of the rotating body in the radial direction and the axial direction respectively, the use of two independent sets of coil mechanisms has great design difficulty, structural volume and manufacturing cost, which is not conducive to the development of the magnetic bearing system 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 do not require the use of two independent sets of coils, but also have a simple structure, low design difficulty, structural volume and manufacturing cost, and are easy to apply and promote.

[0044] Specifically, please refer to Figures 1 and 2. An 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 inserted into the fixed frame 11, and the rotating shaft 12 has a boss 121 in the radial direction around its axis 12a. The fixed frame 11 has a suspension cavity 11a, and the permanent magnet 13 is fixed in the suspension cavity 11a and is 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. The number of stator windings 14 is at least 4, and each stator winding 14 is evenly arranged around the axis 12a of the rotating shaft 12 along the circumferential direction of the rotating shaft 12. The stator winding 14 includes a stator tooth 141 and a coil 142. The stator tooth 141 has a suspension groove 141a, and the boss 121 is accommodated in the suspension groove 141a along the radial direction of the rotating shaft 12. The coil 142 is wound around the stator tooth 141 and is arranged opposite to the boss 121 along the radial direction of the rotating shaft 12.

[0045] The magnetic bearing system 10, through the arrangement of the permanent magnet 13, realizes the suspension of the rotating shaft 12 in the suspension chamber 11a under the magnetic effect of the permanent magnet 13. In addition, through the arrangement of the coil 142 wound around the connecting portion 1413, when the radial or axial position of the rotating shaft 12 needs to be adjusted, it is only necessary to pass a current of a preset flow direction into the coil 142 of each stator winding 14 to achieve the adjustment of the radial or axial direction of the rotating shaft 12. Therefore, the magnetic bearing system 10 can adjust the radial or axial position of the rotating shaft 12 in real time by only controlling the flow direction of the current of a single coil 142 of each stator winding 14. The structure is simple and reliable, which reduces the design difficulty and helps to compress the volume of the magnetic bearing system 10 and control the manufacturing cost.

[0046] For example, please refer to FIG4 , the rotating shaft 12 is arranged in the vertical direction, and it 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, and the approximate distribution of the magnetic flux lines of the permanent magnet 13 is shown in FIG4 . It is worth noting that FIG4 shows two stator windings 14 radially opposite to each other along the rotating shaft 12 as an example. It can be understood that the magnetic bearing system 10 includes at least two pairs of radially opposite stator windings 14 along the circumference of the rotating shaft 12 around the axis 12a of the rotating shaft 12. It should be noted that the aforementioned pair of radially opposite stator windings 14 refers to two stator windings 14 opposite to each other in the 180° direction around the axis 12a. It is worth noting that the boss 121 is received in the suspension groove 141 a along the radial direction of the shaft 12 , so that the boss 121 and the stator tooth 141 have a first axial air gap y1 and a second axial air gap y2 in the axial direction, respectively, and the stator tooth 141 and the shaft 12 have a radial air gap x in the radial direction.

[0047] For example, please refer to FIG. 5 . When the rotating shaft 12 deviates upward during rotation, the rotating shaft 12 needs to be adjusted downward. In this way, the current in the same direction can be passed through the two radially opposite coils 142 and the two coils 142 can generate an upward magnetic field (obtained by the right-hand screw rule). 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 suppresses the magnetic density of the boss 121 and the stator tooth 141 in the second axial air gap y2, and enhances the magnetic density of the boss 121 and the stator tooth 141 in the first axial air gap y1, so that a downward combined force can be generated on the rotating shaft 12. In this way, the rotating shaft 12 can be adjusted downward along its axial direction.

[0048] In addition, in the radial direction, the magnetic field generated by the coils 142 on the left and right sides has the same magnitude and opposite direction in the magnetic flux density enhancement effect on the radial air gaps x on the left and right sides, so the magnetic field generated by the coils 142 in the radial direction has no driving effect on the position adjustment of the rotating shaft 12. In this way, by passing the same-direction current through the two radially opposite coils 142 and making the two coils 142 generate an upward magnetic field, the rotating shaft 12 can be adjusted downward.

[0049] For example, please refer to FIG. 6 . When the rotating shaft 12 deviates downward during rotation, the rotating shaft 12 needs to be adjusted upward. In this way, the current in the same direction 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 tooth 141 in the second axial air gap y2, and suppresses the magnetic density of the boss 121 and the stator tooth 141 in the first axial air gap y1, so that an upward combined force can be generated on the rotating shaft 12. In this way, the rotating shaft 12 can be adjusted upward along its axial direction.

[0050] In addition, in the radial direction, the magnetic field generated by the coils 142 on the left and right sides has the same magnitude and opposite direction in suppressing the magnetic flux density of the radial air gaps x on the left and right sides, so there is no driving effect on the radial position adjustment of the rotating shaft 12. In this way, by passing the same direction of current through the two radially opposite coils 142 and making the two coils 142 generate downward magnetic fields, the rotating shaft 12 can be adjusted downward.

[0051] For example, please refer to FIG. 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, reverse 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. By analyzing the distribution of the magnetic flux lines generated by the left and right coils 142, it can be seen that in the radial direction, the magnetic field generated by the coil 142 on the left has a magnetic flux enhancement effect in the radial air gap x on the left, and the magnetic field generated by the coil 142 on the right has a magnetic flux suppression effect in the radial air gap x on the right, so that a leftward resultant force can be generated 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 coil 142 on the left has a magnetic flux enhancement effect in the first axial air gap y1 on the left, and has 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 coil 142 on the right has a magnetic flux suppression effect in the first axial air gap y1 on the right, and has 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 the same in magnitude and opposite in direction, so there is no driving effect on the position adjustment of the rotating shaft 12 in the axial direction. In this way, by passing reverse currents through the two radially opposite coils 142 and causing the two coils 142 to generate magnetic fields with one side facing upward and the other side facing downward, respectively, the rotating shaft 12 can be adjusted to the left.

[0053] For example, please refer to FIG8 . 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, reverse currents can be passed through the two radially opposite coils 142 and the two coils 142 generate magnetic fields with one side facing downward and the other side facing 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 coil 142 on the left has a magnetic flux suppression effect in the radial air gap x on the left, and the magnetic field generated by the coil 142 on the right has a magnetic flux enhancement effect in the radial air gap x on the right, so that a rightward combined force can be generated 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 coil 142 on the left has a magnetic density suppression effect in the first axial air gap y1 on the left, and has a magnetic density enhancement effect in the second axial air gap y2 on the left; in the axial direction, the magnetic field generated by the coil 142 on the right has a magnetic density enhancement effect in the first axial air gap y1 on the right, and has a magnetic density suppression effect in the second axial air gap y2 on the right. Therefore, in the axial direction, the magnetic density effects on the left and right sides are the same in magnitude and opposite in direction, so there is no driving effect on the position adjustment of the rotating shaft 12 in the axial direction. In this way, by passing reverse currents through the two radially opposite coils 142 and causing the two coils 142 to generate magnetic fields with one side facing downward and the other side facing upward, the rotating shaft 12 can be adjusted to the right.

[0055] Optionally, in combination with what is shown in FIG. 3 , the stator tooth 141 may include a first tooth 1411 and a second tooth 1412 that are arranged in parallel and spaced apart, and a connecting portion 1413 that connects 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 141 a , and the suspension groove 141 a 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, in combination with Figures 1 and 3, 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 effect of the coil 142 on enhancing or suppressing the magnetic flux density of the first axial air gap y1 and the second axial air gap y2 can be improved.

[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, in combination with Figures 1 and 2, the magnetic bearing system 10 may include a support frame 15, which is arranged in a suspension cavity 11a of the fixed frame 11, and the support frame 15 is arranged along the circumference of the rotating shaft 12 around the axis 12a of the rotating shaft 12. 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, in combination with Figures 1 and 2, 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, which helps 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, in combination with Figures 1 and 2, 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, which helps to improve the compactness of the structure and the ease of assembly.

[0065] Optionally, the end ring 111 has a through hole 111a, and the through hole 111a 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 is connected between the rotating shaft 12 and the stator teeth 141, the controller is electrically connected to the sensor and the power amplifier, and the power amplifier is 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 using the magnetic bearing system 10 in 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] Please refer to FIG. 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 the axial direction and radial direction through a sensor;

[0071] S3. When the sensor detects that the 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 through the two radially opposite coils 142 until the shaft 12 falls into the preset axial position range in the axial direction; and / or, when the sensor detects that the 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 reverse current flows through the two radially opposite coils 142 until the 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 only by 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 the manufacturing cost.

[0074] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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 only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A magnetic bearing system, characterized in that: The magnetic bearing system comprises: Fixed frame; A rotating shaft, the rotating shaft is passed through the fixing frame, and the rotating shaft has a convex shoulder in the radial direction around its axis; A permanent magnet, the fixing frame has a suspension cavity, the permanent magnet is fixed in the suspension cavity and the permanent magnet is arranged around the axis of the rotating shaft, and the rotating shaft is suspended in the suspension cavity under the magnetic effect of the permanent magnet; The stator winding includes at least four stator windings, each of which is evenly arranged around the axis along the circumference of the rotating shaft. The stator winding includes stator teeth and coils. The stator teeth have suspension grooves. The bosses are accommodated in the suspension grooves along the radial direction of the rotating shaft. The coils are wound around the stator teeth and arranged opposite to the bosses along the radial direction.

2. The magnetic bearing system according to claim 1, characterized in that: The stator teeth include a first tooth and a second tooth that are arranged in parallel and spaced apart, and a connecting portion that connects the first tooth and the second tooth. The coil is wound around the connecting portion. The first tooth, the second tooth and the connecting portion form the suspension slot.

3. The magnetic bearing system according to claim 2, characterized in that: 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.

4. The magnetic bearing system according to claim 3, characterized in that: The first axial air gap is larger than the second axial air gap.

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

6. 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.

7. 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 a side of the permanent magnet away from the stator teeth along the axial direction of the rotating shaft, and the bottom bracket abuts against a side of the stator teeth away from the permanent magnet along the axial direction.

8. The magnetic bearing system according to any one of claims 1 to 7, characterized in that: The magnetic bearing system also 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 at the same time. The power amplifier is electrically connected to the coil.

9. A method for controlling a magnetic bearing system, using the magnetic bearing system according to claim 8, 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 current flows through the two radially 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 through the two radially opposite coils until the rotating shaft falls into the preset radial position range along the axial direction.

10. An electrical device, characterized in that: The electrical equipment includes the magnetic bearing system as claimed in claim 8; or, the electrical equipment uses the magnetic bearing system control method as claimed in claim 9 to control the magnetic bearing system.

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