Design method of repulsive spherical axial passive magnetic bearing

Abstract

The disclosed embodiment provides a method for designing a repulsive spherical axial passive magnetic bearing, which relates to the technical field of designing a repulsive spherical axial passive magnetic bearing. The method comprises: determining the energy model of the air gap magnetic field of the damping permanent magnet pole of the repulsive spherical axial passive magnetic bearing based on the principle of virtual displacement; determining the damping force according to the air gap magnetic field energy model of the damping permanent magnet pole of the repulsive spherical axial passive magnetic bearing; determining the rotor dynamics model according to the damping force based on the law of conservation of energy; determining the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing according to the rotor dynamics model. By adopting this technical solution, specific design parameters can be given, thereby improving the efficiency of the design of the repulsive spherical axial passive magnetic bearing.

Description

Technical Field

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

[0002] At present, passive magnetic bearings are used more and more frequently. Passive magnetic bearings achieve contactless suspension support of the moving and stationary parts of the system through the magnetic force generated by permanent magnets. At the same time, the energy of the moving part is converted into eddy current loss through the bearing damper, which quickly attenuates the axial oscillation of the moving part and improves the stability and reliability of the system. Compared with active magnetic bearings, passive magnetic bearings have a simple structure and do not require a control system. Therefore, they have high reliability, low loss, and do not require external energy, which has unique advantages in some special occasions.

[0003] At present, there is an urgent need for a design method for a repulsive spherical axial passive magnetic bearing that can provide specific design parameters and thereby improve the efficiency of the design of a repulsive spherical axial passive magnetic bearing. Summary of the invention

[0004] 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 spherical axial passive magnetic bearing.

[0005] A first aspect of an embodiment of the present disclosure provides a method for designing a repulsive spherical axial passive magnetic bearing, the method comprising:

[0006] Based on the virtual displacement principle, the air gap magnetic field energy model of the damped permanent magnet pole of the repulsive spherical axial passive magnetic bearing is determined;

[0007] Determining the damping force according to the air gap magnetic field energy model of the damping permanent magnet pole of the repulsive spherical axial passive magnetic bearing;

[0008] Based on the law of conservation of energy and according to the damping force, a rotor dynamics model is determined;

[0009] According to the rotor dynamics model, the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing is determined.

[0010] In one example, determining the rotor dynamics model based on the law of conservation of energy and according to the damping force includes:

[0011] Acquire the displacement caused by the axial vibration of the moving part of the magnetic levitation measurement platform, and determine the speed caused by the axial vibration of the moving part of the magnetic levitation measurement platform according to the displacement caused by the axial vibration of the moving part of the magnetic levitation measurement platform;

[0012] Based on the law of conservation of energy, the rotor dynamics model is determined according to the damping force, the speed generated by the axial vibration of the moving part of the magnetic suspension measurement platform and the axial vibration period of the moving part of the platform.

[0013] In one example, determining the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing according to the rotor dynamics model includes:

[0014] The bearing damping coefficient of the repulsive spherical axial passive magnetic bearing is determined according to the rotor dynamics model, the axial vibration angular velocity of the platform moving part and the axial vibration amplitude of the platform moving part.

[0015] In one example, after determining the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing, the method further includes:

[0016] The thickness of the optimal damping conductor is determined according to the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing.

[0017] In one example, the method further includes:

[0018] Determine the main air gap magnetic field strength and the air gap leakage magnetic field strength based on the virtual displacement principle;

[0019] 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;

[0020] 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.

[0021] 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:

[0022] 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;

[0023] 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.

[0024] A second aspect of the embodiments of the present disclosure provides a repulsive spherical axial passive magnetic bearing design device, the device comprising:

[0025] The first determination module is used to determine the air gap magnetic field energy model of the damping permanent magnet pole of the repulsive spherical axial passive magnetic bearing based on the virtual displacement principle;

[0026] A second determination module is used to determine the damping force according to the air gap magnetic field energy model of the damping permanent magnet magnetic pole of the repulsive spherical axial passive magnetic bearing;

[0027] A third determination module is used to determine a rotor dynamics model according to the damping force based on the law of conservation of energy;

[0028] The fourth determination module is used to determine the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing according to the rotor dynamics model.

[0029] In one example, the third determining module includes:

[0030] An acquisition submodule, used to acquire the displacement generated by the axial vibration of the moving part of the magnetic levitation measurement platform, and determine the speed generated by the axial vibration of the moving part of the magnetic levitation measurement platform according to the displacement generated by the axial vibration of the moving part of the magnetic levitation measurement platform;

[0031] The first determination submodule is used to determine the rotor dynamics model based on the law of conservation of energy according to the damping force, the speed generated by the axial vibration of the moving part of the magnetic suspension measurement platform and the axial vibration period of the platform moving part.

[0032] In one example, the fourth determination module is used to determine the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing according to the rotor dynamics model, the axial vibration angular velocity of the platform motion component and the axial vibration amplitude of the platform motion component.

[0033] In one example, the apparatus further comprises:

[0034] The fifth determination module is used to determine the thickness of the optimal damping conductor according to the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing.

[0035] In one example, the apparatus further comprises:

[0036] A sixth determination module, used to determine the main air gap magnetic field strength and the air gap leakage magnetic field strength based on the virtual displacement principle;

[0037] A seventh determination module, for determining 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;

[0038] The eighth 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.

[0039] In one example, the eighth determination module includes:

[0040] The second 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;

[0041] The third 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.

[0042] A third aspect of an embodiment of the present disclosure provides an electronic device, 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.

[0043] 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.

[0044] The disclosed embodiment provides a design method for a repulsive spherical axial passive magnetic bearing, including: determining the damping permanent magnet pole air gap magnetic field energy model of the repulsive spherical axial passive magnetic bearing based on the virtual displacement principle; determining the damping force according to the damping permanent magnet pole air gap magnetic field energy model of the repulsive spherical axial passive magnetic bearing; determining the rotor dynamics model according to the damping force based on the law of conservation of energy; determining the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing according to the rotor dynamics model. By adopting this technical solution, specific design parameters can be given, thereby improving the efficiency of the design of the repulsive spherical axial passive magnetic bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] 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.

[0046] 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.

[0047] Figure 1 It is a flow chart of a design method of a repulsive spherical axial passive magnetic bearing provided by an embodiment of the present disclosure;

[0048] Figure 2 It is a structural schematic diagram of a repulsive spherical axial passive magnetic bearing provided by an embodiment of the present disclosure;

[0049] Figure 3 It is a structural schematic diagram of a repulsive spherical axial passive magnetic bearing design device provided by an embodiment of the present disclosure;

[0050] Figure 4 It is a structural diagram of an electronic device in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0051] 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.

[0052] 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.

[0053] Figure 1 1 is a flow chart of a method for designing a repulsive spherical axial passive magnetic bearing provided by an embodiment of the present disclosure, and the method can be performed by an electronic device. The electronic device can be exemplarily understood as a device such as a mobile phone, a tablet computer, a laptop computer, a desktop computer, a smart TV, etc. Figure 1 As shown, the method provided in this embodiment includes the following steps:

[0054] S101. Based on the virtual displacement principle, determine the air gap magnetic field energy model of the damping permanent magnet pole of the repulsive spherical axial passive magnetic bearing.

[0055] In one example, based on the principle of virtual displacement, the magnetic field energy in the air gap at the damping permanent magnet is first calculated. The damping force is the inverse of the energy in the axial displacement. The magnetic field energy model of the air gap of the damping permanent magnet pole of the repulsive spherical axial passive magnetic bearing is:

[0056] ;

[0057] Where W is the magnetic field energy model of the air gap of the damped permanent magnet pole of the repulsive spherical axial passive magnetic bearing, R ci and R co are the inner diameter and outer diameter of the damping permanent magnet respectively. h sl is the thickness of the damping conductor, Bcz is the main magnetic field strength, B czlou is the leakage magnetic field strength of the damping permanent magnet.

[0058] In one example, the main magnetic field strength can be determined by the following formula:

[0059] B cz = B r ( δ+h sl +z ) / ( δ+h sl );

[0060] in, B cz is the main magnetic field strength, B r is the residual magnetization intensity of the permanent magnet, δ is the axial air gap between the upper and lower end surfaces of the permanent magnet ring of the repulsive spherical axial passive magnetic bearing, h sl is the thickness of the damping conductor, and z is the axial position change between the upper and lower spherical surfaces of the repulsive spherical axial passive magnetic bearing.

[0061] In one example, the leakage magnetic field strength of the damping permanent magnet can be determined by the following formula:

[0062] B czlou = B r ( δ+h sl +z ) / ( δ+h sl );

[0063] in, B czlou is the leakage magnetic field strength of the damping permanent magnet, B r is the residual magnetization intensity of the permanent magnet, δ is the axial air gap between the upper and lower end surfaces of the permanent magnet ring of the repulsive spherical axial passive magnetic bearing, h sl is the thickness of the damping conductor, and z is the axial position change between the upper and lower spherical surfaces of the repulsive spherical axial passive magnetic bearing.

[0064] S102. Determine the damping force according to the air gap magnetic field energy model of the damping permanent magnet pole of the repulsive spherical axial passive magnetic bearing.

[0065] In one example, the damping force may be determined by the following formula:

[0066] ;

[0067] in, is the damping force, W is the air gap magnetic field energy model of the damping permanent magnet pole of the repulsive spherical axial passive magnetic bearing, z is the axial position change between the upper and lower spherical surfaces of the repulsive spherical axial passive magnetic bearing, R ci and R co are the inner and outer diameters of the damping permanent magnet, B cz is the main magnetic field strength, B czlou is the leakage magnetic field strength of the damping permanent magnet, is the vacuum permeability, h sl is the thickness of the damping conductor.

[0068] S103. Based on the law of conservation of energy and the damping force, a rotor dynamics model is determined.

[0069] In one example, based on the law of conservation of energy and according to the damping force, determining the rotor dynamics model includes:

[0070] Obtaining the displacement caused by the axial vibration of the moving part of the magnetic levitation measurement platform, and determining the speed caused by the axial vibration of the moving part of the magnetic levitation measurement platform according to the displacement caused by the axial vibration of the moving part of the magnetic levitation measurement platform;

[0071] Based on the law of conservation of energy, the rotor dynamics model is determined according to the damping force, the speed generated by the axial vibration of the moving part of the magnetic suspension measurement platform and the axial vibration cycle time of the moving part of the platform.

[0072] In one example, the displacement caused by the axial vibration of the moving part of the magnetic suspension measurement platform is:

[0073] ;

[0074] Among them, s is the axial vibration displacement of the platform moving part, ω is the axial vibration angular velocity of the platform moving part, and t is time.

[0075] In one example, the velocity generated by the axial vibration of the moving part of the magnetic suspension measurement platform is:

[0076] ;

[0077] in, is the speed of the axial vibration of the moving part of the magnetic suspension measurement platform, s is the axial vibration displacement of the moving part of the platform, ω is the axial vibration angular velocity of the moving part of the platform, t is the time, is the axial vibration amplitude of the platform moving parts.

[0078] According to the law of conservation of energy, the eddy current loss consumed by the moving part of the magnetic suspension measurement platform is the mechanical energy of vibration, that is, the expression of the rotor dynamics model is:

[0079] ;

[0080] in, is the mechanical energy generated by the vibration of the platform moving parts, T is the axial vibration cycle time of the platform moving parts, is the damping force, and v is the axial vibration velocity of the platform moving parts.

[0081] S104. Determine the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing according to the rotor dynamics model.

[0082] In one example, determining a bearing damping coefficient of a repulsive spherical axial passive magnetic bearing according to a rotor dynamics model includes:

[0083] The bearing damping coefficient of the repulsive spherical axial passive magnetic bearing is determined according to the rotor dynamics model, the axial vibration angular velocity of the platform moving parts and the axial vibration amplitude of the platform moving parts.

[0084] In an example, it is assumed that the equivalent damping coefficient of the moving part of the magnetic levitation measurement platform is C d , then this part of energy can also be expressed as:

[0085] ;

[0086] in, is the rotor dynamics model, T is the axial vibration cycle time of the platform moving parts, C d is the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing, v is the axial vibration velocity of the platform moving parts, is the axial vibration amplitude of the platform moving parts, and ω is the axial vibration angular velocity of the platform moving parts.

[0087] According to the above formula, the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing is:

[0088] ;

[0089] In one example, C d is the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing, T is the axial vibration cycle time of the platform moving parts, is the damping force, v is the axial vibration velocity of the platform moving parts, is the axial vibration amplitude of the platform moving parts, and ω is the axial vibration angular velocity of the platform moving parts.

[0090] In one example, after determining the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing, the method further includes:

[0091] The thickness of the optimal damping conductor is determined according to the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing.

[0092] In one example, the function of the axial damper is to suppress the axial vibration caused by rigid mode or load disturbance, so before design, modal analysis is first performed to obtain the axial vibration frequency. Assume that the axial resonance speed obtained by analysis is , then the required bearing damping coefficient of the repulsive spherical axial passive magnetic bearing is:

[0093] ;

[0094] in, is the logarithmic attenuation rate required by the damping system, and the value is generally required to be between 0.7 and 1. The relationship between the damping force and the thickness of the stator copper sheet is that as the thickness of the copper sheet increases, the damping force first increases and then decreases. Therefore, the optimal thickness with the maximum damping force can be obtained by solving the differential equation to obtain the optimal thickness of the damping conductor:

[0095] ;

[0096] in, is the damping force, h sl is the thickness of the damping conductor.

[0097] In one example, the method further includes:

[0098] Determine the main air gap magnetic field strength and the air gap leakage magnetic field strength based on the virtual displacement principle;

[0099] According to the main air gap magnetic field intensity and the air gap leakage magnetic field intensity, the magnetic field energy model at the air gap of the repulsive type combined spherical axial single-layer permanent magnet is determined;

[0100] 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.

[0101] In one example, the excitation capacity of a passive magnetic bearing is equivalent to magnetic charge. Assuming that the magnetic charge is evenly distributed on the upper and lower spherical surfaces of the permanent magnet of a repulsive spherical axial passive magnetic bearing, the magnetic charge density on the upper spherical surface is

[0102] , the magnetic charge density on the lower spherical surface is . From the magnetostatics theory, we can get:

[0103] ;

[0104] ;

[0105] 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 surface of the permanent magnet ring of the spherical axial passive magnetic bearing; μ 0 is the vacuum permeability, μ 0=4π×10 -7 H / m; M is the magnetization intensity; H is the magnetic field intensity. Since the normal direction of the end face of the permanent magnet ring of the spherical axial passive magnetic bearing is the same as the magnetization direction, we have:

[0106] ;

[0107] in, is the residual magnetization of the permanent magnet.

[0108] Since the magnetic bearing is in a stable state of changing motion, the air gap magnetic field strength is also a relatively changing stable state. Therefore, the main air gap magnetic field strength and the air gap leakage magnetic field strength can be expressed as:

[0109] ;

[0110] ;

[0111] in, B z is the main air gap magnetic field strength, B zlou is the air gap leakage magnetic field strength.

[0112] In one example, the magnetic field energy model at the air gap of a repulsive type combined spherical axial single-layer permanent magnet is:

[0113] ;

[0114] Wherein, W is the magnetic field energy in the air gap at the upper and lower spherical single-layer permanent magnets of the spherical passive magnetic bearing, Rup and Rdown are the reference radii of the upper and lower spherical single-layer permanent magnets of the passive magnetic bearing, lpm 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, and z is the axial position change between the upper and lower spherical surfaces of the spherical axial passive magnetic bearing.

[0115] 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:

[0116] 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;

[0117] 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.

[0118] 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:

[0119] ;

[0120] In order to provide a sufficiently large axial force, the passive magnetic bearing will adopt a multi-layer permanent magnet structure, and to ensure the convenience of passive magnetic bearing design, the magnetic density of each layer of permanent magnets is equal. Therefore, when z=0, there is n pm The passive magnetic bearing stiffness of the layer permanent magnet can be obtained by the following formula:

[0121] ;

[0122] 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-bearing 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-bearing 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 F w , the maximum allowable axial displacement is △ z max , then the total passive magnetic bearing stiffness is:

[0123] ;

[0124] 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.

[0125] In one example, the number of permanent magnet layers of a repulsive type combined spherical axial passive magnetic bearing is n pm for:

[0126] ;

[0127] 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.

[0128] For a clearer explanation, see Figure 2 A schematic structural diagram of a repulsive spherical axial passive magnetic bearing is shown. Figure 2 In the figure, mark 1 is the rotor magnetic ring, mark 2 is the rotor mounting sleeve, mark 3 is the first permanent magnet of the rotor, mark 4 is the second permanent magnet of the rotor, mark 5 is the third permanent magnet of the rotor, mark 6 is the fourth permanent magnet of the rotor, mark 7 is the fifth permanent magnet of the rotor, mark 8 is the damping permanent magnet, mark 9 is the stator magnetic ring, mark 10 is the stator mounting sleeve, mark 11 is the first permanent magnet of the stator, mark 12 is the second permanent magnet of the stator, mark 13 is the third permanent magnet of the stator, mark 14 is the fourth permanent magnet of the stator, mark 15 is the fifth permanent magnet of the stator, mark 16 is the damping conductor, and mark 17 is the air gap of the magnetic bearing.

[0129] The disclosed embodiment provides a design method for a repulsive spherical axial passive magnetic bearing, including: determining the energy model of the air gap magnetic field of the damping permanent magnet pole of the repulsive spherical axial passive magnetic bearing based on the virtual displacement principle; determining the damping force according to the air gap magnetic field energy model of the damping permanent magnet pole of the repulsive spherical axial passive magnetic bearing; determining the rotor dynamics model according to the damping force based on the law of conservation of energy; determining the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing according to the rotor dynamics model. By adopting this technical solution, specific design parameters can be given, thereby improving the efficiency of the design of the repulsive spherical axial passive magnetic bearing.

[0130] Figure 3 1 is a schematic diagram of a repulsive spherical axial passive magnetic bearing design device provided by an embodiment of the present disclosure. The repulsive spherical axial passive magnetic bearing design device can be understood as the above-mentioned electronic device or a part of the functional modules in the above-mentioned electronic device. Figure 3 As shown, the repulsive spherical axial passive magnetic bearing design device 30 includes:

[0131] The first determination module 301 is used to determine the air gap magnetic field energy model of the damping permanent magnet pole of the repulsive spherical axial passive magnetic bearing based on the virtual displacement principle;

[0132] A second determination module 302 is used to determine the damping force according to the air gap magnetic field energy model of the damping permanent magnet magnetic pole of the repulsive spherical axial passive magnetic bearing;

[0133] A third determination module 303 is used to determine a rotor dynamics model based on the law of conservation of energy and according to the damping force;

[0134] The fourth determination module 304 is used to determine the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing according to the rotor dynamics model.

[0135] In one example, the third determining module 303 includes:

[0136] The acquisition submodule is used to acquire the displacement generated by the axial vibration of the moving part of the magnetic levitation measurement platform, and determine the speed generated by the axial vibration of the moving part of the magnetic levitation measurement platform according to the displacement generated by the axial vibration of the moving part of the magnetic levitation measurement platform;

[0137] The first determination submodule is used to determine the rotor dynamics model based on the law of conservation of energy, according to the damping force, the speed generated by the axial vibration of the moving part of the magnetic suspension measurement platform and the axial vibration cycle time of the moving part of the platform.

[0138] In one example, the fourth determination module 304 is used to determine the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing according to the rotor dynamics model, the axial vibration angular velocity of the platform motion component and the axial vibration amplitude of the platform motion component.

[0139] In one example, the apparatus 30 further includes:

[0140] The fifth determination module 305 is used to determine the thickness of the optimal damping conductor according to the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing.

[0141] In one example, the apparatus 30 further includes:

[0142] A sixth determination module 306, configured to determine the main air gap magnetic field strength and the air gap leakage magnetic field strength based on the virtual displacement principle;

[0143] A seventh determination module 307 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;

[0144] The eighth determination module 308 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.

[0145] In one example, the eighth determination module 308 includes:

[0146] The second 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;

[0147] The third 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] In some embodiments, the client, electronic device can communicate using any currently known or future developed network protocol such as HTTP (HyperText TransferProtocol), and can be interconnected with any form or medium of digital data communication (e.g., communication network). Examples of communication networks include local area networks ("LAN"), wide area networks ("WAN"), internets (e.g., the Internet), and peer-to-peer networks (e.g., ad hoc peer-to-peer networks), as well as any currently known or future developed networks.

[0156] The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device.

[0157] 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 damping permanent magnet pole air gap magnetic field energy model of the repulsive spherical axial passive magnetic bearing based on the virtual displacement principle; determines the damping force according to the damping permanent magnet pole air gap magnetic field energy model of the repulsive spherical axial passive magnetic bearing; determines the rotor dynamics model according to the damping force based on the law of conservation of energy; determines the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing according to the rotor dynamics model.

[0158] 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).

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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.

[0163] 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.

[0164] 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.

[0165] The above description is only a specific embodiment 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 spherical axial passive magnetic bearing, characterized in that: include: Based on the virtual displacement principle, the air gap magnetic field energy model of the damped permanent magnet pole of the repulsive spherical axial passive magnetic bearing is determined; Determining the damping force according to the air gap magnetic field energy model of the damping permanent magnet pole of the repulsive spherical axial passive magnetic bearing; Based on the law of conservation of energy and according to the damping force, a rotor dynamics model is determined; Determining the rotor dynamics model based on the law of conservation of energy and according to the damping force includes: Acquire the displacement caused by the axial vibration of the moving part of the magnetic levitation measurement platform, and determine the speed caused by the axial vibration of the moving part of the magnetic levitation measurement platform according to the displacement caused by the axial vibration of the moving part of the magnetic levitation measurement platform; Based on the law of conservation of energy, a rotor dynamics model is determined according to the damping force, the speed generated by the axial vibration of the moving part of the magnetic suspension measurement platform, and the axial vibration cycle time of the moving part of the platform; Determining the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing according to the rotor dynamics model; Determining the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing according to the rotor dynamics model includes: The bearing damping coefficient of the repulsive spherical axial passive magnetic bearing is determined according to the rotor dynamics model, the axial vibration angular velocity of the platform moving part and the axial vibration amplitude of the platform moving part.

2. The method according to claim 1, characterized in that After determining the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing, the method further includes: The thickness of the optimal damping conductor is determined according to the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing.

3. The method according to claim 1, characterized in that The method further 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; 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.

4. The method according to claim 3, 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 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.

5. A repulsive spherical axial passive magnetic bearing design device, characterized in that: The device comprises: The first determination module is used to determine the air gap magnetic field energy model of the damping permanent magnet pole of the repulsive spherical axial passive magnetic bearing based on the virtual displacement principle; A second determination module is used to determine the damping force according to the air gap magnetic field energy model of the damping permanent magnet magnetic pole of the repulsive spherical axial passive magnetic bearing; A third determination module is used to determine a rotor dynamics model according to the damping force based on the law of conservation of energy; A fourth determination module, used to determine the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing according to the rotor dynamics model; The third determining module comprises: An acquisition submodule, used to acquire the displacement generated by the axial vibration of the moving part of the magnetic levitation measurement platform, and determine the speed generated by the axial vibration of the moving part of the magnetic levitation measurement platform according to the displacement generated by the axial vibration of the moving part of the magnetic levitation measurement platform; A first determination submodule is used to determine a rotor dynamics model based on the law of conservation of energy according to the damping force, the speed generated by the axial vibration of the moving part of the magnetic suspension measurement platform, and the axial vibration period of the moving part of the platform; The fourth determination module is used to determine the bearing damping coefficient of the repulsive spherical axial passive magnetic bearing according to the rotor dynamics model, the axial vibration angular velocity of the platform moving part and the axial vibration amplitude of the platform moving part.

6. 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 4.

7. 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 4 is implemented.

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