Design method of repulsive combined spherical axial passive magnetic bearing

Abstract

The disclosed embodiment provides a method for designing a repulsive type combined spherical axial passive magnetic bearing, which relates to the technical field of passive magnetic bearing design. The rotor part of the repulsive type combined spherical axial passive magnetic bearing is an axial single-degree-of-freedom contactless suspension support, and the method includes: determining the main air gap magnetic field strength and the air gap leakage magnetic field strength based on the virtual displacement principle; determining the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet according to the main air gap magnetic field strength and the air gap leakage magnetic field strength; determining the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing according to the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet. By adopting this technical solution, the design parameters of the repulsive type combined spherical axial passive magnetic bearing can be quickly designed, thereby improving the design efficiency.

Description

Technical Field

[0001] The disclosed embodiments relate to the technical field of passive magnetic bearing design, and in particular to a design method for a repulsive type combined spherical axial passive magnetic bearing. Background Art

[0002] At present, traditional rotating power machinery uses mechanical bearing support, which is restricted by mechanical bearing friction and rotor vibration, has low reliability, poor rotation accuracy, and is very susceptible to external environmental interference. Magnetic bearing support uses non-contact suspension support technology, which eliminates mechanical friction and wear, does not require lubrication, has the advantages of high power density, small size, and light weight, and can effectively improve system reliability and resistance to external environmental interference. It is an ideal support component for the development of high-end equipment machinery in the future.

[0003] However, there is currently a lack of a relatively fast design method for repulsive type combined spherical axial passive magnetic bearings.

[0004] Therefore, there is an urgent need for a design method for a repulsive combined spherical axial passive magnetic bearing, which can quickly design the design parameters of the repulsive combined spherical axial passive magnetic bearing and thus improve the design efficiency. Summary of the invention

[0005] In order to solve the above technical problems or at least partially solve the above technical problems, an embodiment of the present disclosure provides a design method for a repulsive type combined spherical axial passive magnetic bearing.

[0006] A first aspect of the disclosed embodiments provides a method for designing a repulsive type combined spherical axial passive magnetic bearing, wherein the rotor portion of the repulsive type combined spherical axial passive magnetic bearing is axially supported by a single degree of freedom contactless suspension, the method comprising:

[0007] Determine the main air gap magnetic field strength and the air gap leakage magnetic field strength based on the virtual displacement principle;

[0008] Determine a magnetic field energy model at the air gap of a repulsive type combined spherical axial single-layer permanent magnet according to the main air gap magnetic field strength and the air gap leakage magnetic field strength;

[0009] According to the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet, the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing is determined.

[0010] In one example, determining the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing according to the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet includes:

[0011] According to the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet, the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing is determined;

[0012] The number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing is determined according to the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing.

[0013] In one example, determining the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing according to the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing includes:

[0014] If the first condition and the second condition are met, the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing is derived to obtain n pm Passive magnetic bearing stiffness of layer permanent magnets;

[0015] According to the n pm The number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing is determined by the passive magnetic bearing stiffness of the layers of permanent magnets and the total passive magnetic bearing stiffness; wherein the first condition is that the axial force of each permanent magnet layer is evenly distributed; the second condition is that the axial position change between the upper spherical surface and the lower spherical surface of the repulsive type combined spherical axial passive magnetic bearing is zero.

[0016] In one example, according to the n pm The number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing is determined by calculating the passive magnetic bearing stiffness of the layer permanent magnet and the total passive magnetic bearing stiffness, including:

[0017] Calculate the total passive magnetic bearing stiffness and the n pm The number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing is obtained by calculating the quotient of the passive magnetic bearing stiffness of the layers of permanent magnets.

[0018] A second aspect of the disclosed embodiment provides a repulsive type combined spherical axial passive magnetic bearing design device, wherein the rotor portion of the repulsive type combined spherical axial passive magnetic bearing is axially single-degree-of-freedom contactless suspended support, and the device comprises:

[0019] The first determination module is used to determine the main air gap magnetic field strength and the air gap leakage magnetic field strength based on the virtual displacement principle;

[0020] A second determination module is used to determine a magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet according to the main air gap magnetic field strength and the air gap leakage magnetic field strength;

[0021] The third determination module is used to determine the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing according to the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet.

[0022] In one example, the third determining module includes:

[0023] A first determination submodule is used to determine the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing according to the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet;

[0024] The second determination submodule is used to determine the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing according to the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing.

[0025] In one example, the second determining submodule is specifically configured to:

[0026] If the first condition and the second condition are met, the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing is derived to obtain n pm Passive magnetic bearing stiffness of layer permanent magnets;

[0027] According to the n pm The number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing is determined by the passive magnetic bearing stiffness of the layers of permanent magnets and the total passive magnetic bearing stiffness; wherein the first condition is that the axial force of each permanent magnet layer is evenly distributed; the second condition is that the axial position change between the upper spherical surface and the lower spherical surface of the repulsive type combined spherical axial passive magnetic bearing is zero.

[0028] In one example, the second determining submodule is specifically configured to:

[0029] Calculate the total passive magnetic bearing stiffness and the n pm The number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing is obtained by calculating the quotient of the passive magnetic bearing stiffness of the layers of permanent magnets.

[0030] A third aspect of an embodiment of the present disclosure provides an electronic device, the server comprising: a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the method of the first aspect above.

[0031] A fourth aspect of an embodiment of the present disclosure provides a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a processor, the method of the first aspect described above can be implemented.

[0032] The disclosed embodiment provides a design method for a repulsive type combined spherical axial passive magnetic bearing, wherein the rotor part of the repulsive type combined spherical axial passive magnetic bearing is an axial single-degree-of-freedom contactless suspension support, and the method comprises: determining the main air gap magnetic field strength and the air gap leakage magnetic field strength based on the virtual displacement principle; determining the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet according to the main air gap magnetic field strength and the air gap leakage magnetic field strength; determining the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing according to the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet. By adopting this technical solution, the design parameters of the repulsive type combined spherical axial passive magnetic bearing can be quickly designed, thereby improving the design efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0035] Figure 1 It is a structural schematic diagram of a repulsive type combined spherical axial passive magnetic bearing provided by an embodiment of the present disclosure;

[0036] Figure 2 It is a flow chart of a design method of a repulsive type combined spherical axial passive magnetic bearing provided by an embodiment of the present disclosure;

[0037] Figure 3 It is a structural schematic diagram of a repulsive type combined spherical axial passive magnetic bearing design device provided by an embodiment of the present disclosure;

[0038] Figure 4 It is a structural schematic diagram of an electronic device in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0039] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0041] In this embodiment, it is applied to a repulsive type combined spherical axial passive magnetic bearing. For details, please refer to Figure 1 The schematic diagram of the structure of a repulsive combined spherical axial passive magnetic bearing is shown. The repulsive combined spherical axial passive magnetic bearing can withstand the axial force applied to the stator part along the rotor part, and generates an axial suspension force by forming a repulsive force through the combined permanent magnets used in pairs, thereby realizing the axial single-degree-of-freedom contactless suspension support of the rotor part. When the rotor part produces an axial displacement upward, it moves downward by relying on the gravity of the rotor part itself until the gravity of the rotor part itself and the repulsive force between the paired permanent magnets reach a balance, thereby realizing stable suspension of the rotor part; when the rotor part produces an axial displacement downward, it moves upward by relying on the repulsive force between the paired permanent magnets until the repulsive force between the paired permanent magnets and the gravity of the rotor part itself reach a balance, thereby realizing stable suspension of the rotor part; when there is an angular deflection between the geometric axis of the rotor part of the magnetic bearing and the geometric axis of its stator part, because the spherical center of the magnetic pole surface of the rotor part coincides with the spherical center of the magnetic pole surface of the stator part, at the stator magnetic pole surface, the repulsive force on the rotor part is always along the radial direction of the spherical surface of the rotor part of the magnetic bearing, and all passes through the spherical center of the magnetic pole surface of the rotor part, thereby eliminating the interference force caused by uneven air gap and improving the suspension accuracy of the magnetic bearing.

[0042] Figure 1 Mark 1 is a rotor magnetizer, mark 2 is a rotor mounting sleeve, mark 3 is a first rotor permanent magnet, mark 4 is a second rotor permanent magnet, mark 5 is a third rotor permanent magnet, mark 6 is a fourth rotor permanent magnet, mark 7 is a fifth rotor permanent magnet, mark 8 is a sixth rotor permanent magnet, mark 9 is a seventh rotor permanent magnet, mark 10 is a stator magnetizer, mark 11 is a stator mounting sleeve, mark 12 is a first stator permanent magnet, mark 13 is a second stator permanent magnet, mark 14 is a third stator permanent magnet, mark 15 is a fourth stator permanent magnet, mark 16 is a fifth stator permanent magnet, mark 17 is a sixth stator permanent magnet, mark 18 is a seventh stator permanent magnet, and mark 19 is a magnetic bearing air gap.

[0043] Figure 2 The present invention provides a schematic flow chart of a design method for a repulsive type combined spherical axial passive magnetic bearing, which can be executed by an electronic device. The rotor part of the repulsive type combined spherical axial passive magnetic bearing has an axial single-degree-of-freedom non-contact suspension support. Figure 2 As shown, the method provided in this embodiment includes the following steps:

[0044] S201. Determine the main air gap magnetic field strength and the air gap leakage magnetic field strength based on the virtual displacement principle.

[0045] In one example, the excitation capacity of the repulsive type combined spherical axial passive magnetic bearing is equivalent to the magnetic charge. Assuming that the magnetic charge is evenly distributed on the upper and lower spherical surfaces of the permanent magnet of the repulsive type combined spherical axial passive magnetic bearing, the magnetic charge density on the upper spherical surface is , the magnetic charge density on the lower spherical surface is . From the magnetostatics theory, we can get:

[0046] ;

[0047] ;

[0048] in, σ * is the magnetic charge density on the spherical surface; J 0 is the magnetic pole magnetization intensity vector; is the unit vector in the normal direction of the end face of the permanent magnet ring of the repulsive type combined spherical axial passive magnetic bearing; μ 0 is the vacuum magnetic permeability, which can be determined by the following formula:

[0049] μ 0=4π×10 -7 H / M;

[0050] in, μ 0 is the vacuum magnetic permeability, M is the magnetization intensity, and H is the magnetic field intensity. Since the normal direction of the end face of the permanent magnet ring of the repulsive type combined spherical axial passive magnetic bearing is the same as the magnetization direction, we have:

[0051] ;

[0052] in, σ * is the magnetic charge density on the spherical surface, μ 0 is the vacuum magnetic permeability, M is the magnetization intensity, is the residual magnetization intensity of the permanent magnet. Since the magnetic bearing is in a stable state of changing motion, the air gap magnetic field intensity is also a relatively changing stable state. Therefore, the main air gap magnetic field intensity and the air gap leakage magnetic field intensity can be expressed as:

[0053] ;

[0054] ;

[0055] in, is the main air gap magnetic field strength, is the air gap leakage magnetic field intensity, δ is the axial air gap between the upper and lower end surfaces of the permanent magnet ring of the repulsive type combined spherical axial passive magnetic bearing, z is the axial position change between the upper and lower spherical surfaces of the repulsive type combined spherical axial passive magnetic bearing, is the residual magnetization of the permanent magnet.

[0056] S202. Determine a magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet according to the main air gap magnetic field strength and the air gap leakage magnetic field strength.

[0057] In one example, the magnetic field energy model at the air gap of a repulsive type combined spherical axial single-layer permanent magnet is determined by the following formula:

[0058] ;

[0059] Where W is the magnetic field energy model of the air gap of the repulsive type combined spherical axial single-layer permanent magnet, R up and R down are the reference radius of the upper and lower spherical single-layer permanent magnets of the passive magnetic bearing, l pm is the radial thickness of the single-layer permanent magnet on the upper and lower spherical surfaces of the passive magnetic bearing, δ is the axial air gap between the upper and lower end surfaces of the permanent magnet ring of the spherical axial passive magnetic bearing, z is the axial position change between the upper and lower spherical surfaces of the spherical axial passive magnetic bearing, is the main air gap magnetic field strength, is the air gap leakage magnetic field strength, μ 0 is the magnetic permeability of vacuum.

[0060] S203. Determine the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing according to the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet.

[0061] In one example, according to the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet, determining the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing includes:

[0062] According to the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet, the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing is determined;

[0063] The number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing is determined according to the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing.

[0064] In one example, the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing is determined by the following formula:

[0065] ;

[0066] Among them, among them, W It is the mathematical model of magnetic field energy in the air gap between the upper and lower spherical single-group permanent magnets of the repulsive type combined spherical passive magnetic bearing. R up and R down are the reference radius of the upper and lower spherical single-layer permanent magnets of the passive magnetic bearing, l pm is the radial thickness of the upper and lower spherical single-layer permanent magnets of the passive magnetic bearing, δ is the axial air gap between the upper and lower end surfaces of the permanent magnet ring of the spherical axial passive magnetic bearing, z is the axial position change between the upper and lower spherical surfaces of the spherical axial passive magnetic bearing, It is the axial force generated by the single-layer permanent magnets on the upper and lower spherical surfaces of the repulsive type combined spherical axial passive magnetic bearing.

[0067] In one example, the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing is determined according to the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing, including:

[0068] If the first condition and the second condition are met, the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing is derived to obtain n pm Passive magnetic bearing stiffness of layer permanent magnets;

[0069] According to n pm The number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing is determined by the passive magnetic bearing stiffness of the layers of permanent magnets and the total passive magnetic bearing stiffness; wherein, the first condition is that the axial force of each permanent magnet layer is evenly distributed; the second condition is that the axial position change between the upper spherical surface and the lower spherical surface of the repulsive type combined spherical axial passive magnetic bearing is zero.

[0070] In one example, in order to provide a sufficiently large axial force, the passive magnetic bearing will use a multi-layer permanent magnet structure, and to ensure the convenience of passive magnetic bearing design, the magnetic flux density of each layer of permanent magnets is equal. Therefore, when z=0, n pm The passive magnetic bearing stiffness of the layer permanent magnet can be obtained by the following formula:

[0071] ;

[0072] in, It is the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing. n pm Passive magnetic bearing stiffness of the layer of permanent magnets, R up and R down are the reference radius of the upper and lower spherical single-layer permanent magnets of the passive magnetic bearing, l pm is the radial thickness of the upper and lower spherical single-layer permanent magnets of the passive magnetic bearing, δ is the axial air gap between the upper and lower end faces of the permanent magnet ring of the spherical axial passive magnetic bearing, is the residual magnetization intensity of the permanent magnet, z is the axial position change between the upper and lower spherical surfaces of the spherical axial passive magnetic bearing, μ 0 is the magnetic permeability of vacuum.

[0073] In one example, according to n pm The passive magnetic bearing stiffness of the layer of permanent magnets and the total passive magnetic bearing stiffness determine the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing, including:

[0074] Calculate the total passive magnetic bearing stiffness and n pm The quotient of the stiffness of the passive magnetic bearing with multiple layers of permanent magnets is used to obtain the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing.

[0075] In one example, since the magnetic levitation measurement platform is placed vertically, the gravity of the moving part is in the same direction as the axial load force, and the load capacity required by the axial spherical passive magnetic bearing is the superposition of gravity and axial load force. In addition, in order to ensure reliable axial suspension, the maximum axial load capacity should have a certain safety factor based on these forces. Assuming that the weight of the moving part of the magnetic levitation measurement platform is m, the axial load force is , the maximum permissible axial displacement is , then the total passive magnetic bearing stiffness can be determined by the following formula:

[0076] ;

[0077] in, is the safety factor, which is generally between 2 and 3; g is the acceleration due to gravity, g=9.8m / s 2 , is the total passive magnetic bearing stiffness and m is the mass.

[0078] In one example, the number of permanent magnet layers of a repulsive type combined spherical axial passive magnetic bearing is

[0079] n pm for:

[0080] ;

[0081] in, is the safety factor, which is generally between 2 and 3; g is the acceleration due to gravity, g=9.8m / s 2 , is the total passive magnetic bearing stiffness, m is the mass, R up and R down are the reference radius of the upper and lower spherical single-layer permanent magnets of the passive magnetic bearing, l pm is the radial thickness of the upper and lower spherical single-layer permanent magnets of the passive magnetic bearing, δ is the axial air gap between the upper and lower end faces of the permanent magnet ring of the spherical axial passive magnetic bearing, is the residual magnetization of the permanent magnet, μ 0 is the magnetic permeability of vacuum.

[0082] The disclosed embodiment provides a design method for a repulsive type combined spherical axial passive magnetic bearing, the rotor part of the repulsive type combined spherical axial passive magnetic bearing is an axial single-degree-of-freedom contactless suspension support, the method comprising: determining the main air gap magnetic field strength and the air gap leakage magnetic field strength based on the virtual displacement principle; determining the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet according to the main air gap magnetic field strength and the air gap leakage magnetic field strength; determining the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing according to the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet. By adopting this technical solution, the design parameters of the repulsive type combined spherical axial passive magnetic bearing can be quickly designed, thereby improving the design efficiency.

[0083] Figure 3 This is a schematic diagram of the structure of a repulsive type combined spherical axial passive magnetic bearing design device provided by an embodiment of the present disclosure. The rotor part of the repulsive type combined spherical axial passive magnetic bearing has an axial single-degree-of-freedom non-contact suspension support. The repulsive type combined spherical axial passive magnetic bearing design device can be understood as the above-mentioned electronic device or a part of the functional module in the above-mentioned electronic device. Figure 3 As shown, the repulsive type combined spherical axial passive magnetic bearing design device 30 includes:

[0084] The first determination module 301 is used to determine the main air gap magnetic field strength and the air gap leakage magnetic field strength based on the virtual displacement principle;

[0085] The second determination module 302 is used to determine the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet according to the main air gap magnetic field strength and the air gap leakage magnetic field strength;

[0086] The third determination module 303 is used to determine the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing according to the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet.

[0087] In one example, the third determining module 303 includes:

[0088] The first determination submodule is used to determine the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing according to the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet;

[0089] The second determination submodule is used to determine the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing according to the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing.

[0090] In one example, the second determination submodule is specifically configured to:

[0091] If the first condition and the second condition are met, the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing is derived to obtain n pm Passive magnetic bearing stiffness of layer permanent magnets;

[0092] According to n pm The number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing is determined by the passive magnetic bearing stiffness of the layers of permanent magnets and the total passive magnetic bearing stiffness; wherein, the first condition is that the axial force of each permanent magnet layer is evenly distributed; the second condition is that the axial position change between the upper spherical surface and the lower spherical surface of the repulsive type combined spherical axial passive magnetic bearing is zero.

[0093] In one example, the second determination submodule is specifically configured to:

[0094] Calculate the total passive magnetic bearing stiffness and n pm The quotient of the stiffness of the passive magnetic bearing with multiple layers of permanent magnets is used to obtain the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing.

[0095] The device provided in this embodiment can execute the method of any of the above embodiments, and its execution method and beneficial effects are similar, which will not be repeated here.

[0096] An embodiment of the present disclosure further provides an electronic device, which includes: a memory, in which a computer program is stored; and a processor, which is used to execute the computer program. When the computer program is executed by the processor, the method of any of the above embodiments can be implemented.

[0097] For example, Figure 4 Schematic diagram of the structure of an electronic device in the embodiment of the present disclosure. Figure 4 , which shows a schematic diagram of the structure of an electronic device 1000 suitable for implementing the embodiment of the present disclosure. The electronic device 1000 in the embodiment of the present disclosure may include but is not limited to mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), vehicle terminals (such as vehicle navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 4 The electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0098] like Figure 4 As shown, the electronic device 1000 may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 1001, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1008 to a random access memory (RAM) 1003. In the RAM 1003, various programs and data required for the operation of the electronic device 1000 are also stored. The processing device 1001, the ROM 1002, and the RAM 1003 are connected to each other via a bus 1004. An input / output (I / O) interface 1005 is also connected to the bus 1004.

[0099] Typically, the following devices may be connected to the I / O interface 1005: an input device 1006 including, for example, a touch screen, a touch pad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 1007 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 1008 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 may allow the electronic device 1000 to communicate with other devices wirelessly or by wire to exchange data. Although Figure 4 The electronic device 1000 is shown with various devices, but it should be understood that it is not required to implement or possess all the devices shown. More or fewer devices may be implemented or possessed instead.

[0100] In particular, according to an embodiment of the present disclosure, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program carried on a non-transitory computer-readable medium, and the computer program contains program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device 1009, or installed from a storage device 1008, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment of the present disclosure are executed.

[0101] It should be noted that the computer-readable medium mentioned above in the present disclosure may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, device or device. In the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. This propagated data signal may take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. Computer readable signal media may also be any computer readable medium other than computer readable storage media, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer readable medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0102] In some embodiments, the client and the server may communicate using any currently known or future developed network protocol such as HTTP (HyperText Transfer Protocol), and may be interconnected with any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network ("LAN"), a wide area network ("WAN"), an internet (e.g., the Internet), and a peer-to-peer network (e.g., an ad hoc peer-to-peer network), as well as any currently known or future developed network.

[0103] The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device.

[0104] The above-mentioned computer-readable medium carries one or more programs. When the above-mentioned one or more programs are executed by the electronic device, the electronic device: determines the main air gap magnetic field strength and the air gap leakage magnetic field strength based on the virtual displacement principle; determines the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet according to the main air gap magnetic field strength and the air gap leakage magnetic field strength; determines the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing according to the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet.

[0105] Computer program code for performing the operations of the present disclosure may be written in one or more programming languages ​​or a combination thereof, including, but not limited to, object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0106] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some implementations as replacements, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0107] The units involved in the embodiments described in the present disclosure may be implemented by software or hardware, wherein the name of a unit does not, in some cases, limit the unit itself.

[0108] The functions described above herein may be performed at least in part by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), complex programmable logic devices (CPLDs), and the like.

[0109] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0110] The embodiments of the present disclosure also provide a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a processor, the method of any of the above embodiments can be implemented. The execution method and beneficial effects are similar and will not be repeated here.

[0111] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0112] The above are only specific embodiments of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A design method for a repulsive type combined spherical axial passive magnetic bearing, characterized in that: The rotor part of the repulsive type combined spherical axial passive magnetic bearing has an axial single-degree-of-freedom contactless suspension support, and the method comprises: Determine the main air gap magnetic field strength and the air gap leakage magnetic field strength based on the virtual displacement principle; Determine a magnetic field energy model at the air gap of a repulsive type combined spherical axial single-layer permanent magnet according to the main air gap magnetic field strength and the air gap leakage magnetic field strength; Determine the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing according to the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet; The method of determining the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing according to the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet comprises: According to the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet, the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing is determined; The number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing is determined according to the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing.

2. The method according to claim 1, characterized in that The method of determining the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing according to the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing comprises: If the first condition and the second condition are met, the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing is derived to obtain n pm Passive magnetic bearing stiffness of layer permanent magnets; According to the pm The number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing is determined by the passive magnetic bearing stiffness of the layers of permanent magnets and the total passive magnetic bearing stiffness; wherein the first condition is that the axial force of each permanent magnet layer is evenly distributed; the second condition is that the axial position change between the upper spherical surface and the lower spherical surface of the repulsive type combined spherical axial passive magnetic bearing is zero.

3. The method according to claim 2, characterized in that According to the pm The number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing is determined by calculating the passive magnetic bearing stiffness of the layer permanent magnet and the total passive magnetic bearing stiffness, including: Calculate the total passive magnetic bearing stiffness and the n pm The number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing is obtained by calculating the quotient of the passive magnetic bearing stiffness of the layers of permanent magnets.

4. A repulsive type combined spherical axial passive magnetic bearing design device, characterized in that: The rotor part of the repulsive type combined spherical axial passive magnetic bearing is axially supported by a single degree of freedom contactless suspension, and the device comprises: A first determination module is used to determine the main air gap magnetic field strength and the air gap leakage magnetic field strength based on the virtual displacement principle; A second determination module is used to determine a magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet according to the main air gap magnetic field strength and the air gap leakage magnetic field strength; A third determination module is used to determine the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing according to the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet; The third determining module comprises: A first determination submodule is used to determine the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing according to the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet; The second determination submodule is used to determine the number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing according to the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing.

5. The device according to claim 4, characterized in that The second determining submodule is specifically used for: If the first condition and the second condition are met, the axial force generated by the upper and lower spherical single-layer permanent magnets of the repulsive type combined spherical axial passive magnetic bearing is derived to obtain n pm Passive magnetic bearing stiffness of layer permanent magnets; According to the pm The number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing is determined by the passive magnetic bearing stiffness of the layers of permanent magnets and the total passive magnetic bearing stiffness; wherein the first condition is that the axial force of each permanent magnet layer is evenly distributed; the second condition is that the axial position change between the upper spherical surface and the lower spherical surface of the repulsive type combined spherical axial passive magnetic bearing is zero.

6. The device according to claim 5, characterized in that The second determining submodule is specifically used for: Calculate the total passive magnetic bearing stiffness and the n pm The number of permanent magnet layers of the repulsive type combined spherical axial passive magnetic bearing is obtained by calculating the quotient of the passive magnetic bearing stiffness of the layers of permanent magnets.

7. An electronic device, characterized in that: include: A processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the method according to any one of claims 1 to 3.

8. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 3 is implemented.

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