A design method for a magnetic levitation bearing and the magnetic levitation bearing

Abstract

This disclosure relates to a design method for a magnetic levitation bearing and a magnetic levitation bearing itself. The design method includes: obtaining key parameters of the magnetic levitation bearing affected by high temperatures; constructing a parametric model of the target design parameters of the magnetic levitation bearing based on the key parameters; and determining the parameter values ​​of each target design parameter at the target temperature based on the parametric model. This disclosure enables the design of magnetic levitation bearings suitable for use in high-temperature environments, expanding the application environment of magnetic levitation bearings beyond medium and low temperature environments, thus broadening the applicable temperature range and increasing the application scenarios of magnetic levitation bearings.

Description

Technical Field

[0001] This disclosure relates to the field of magnetic levitation bearings, specifically to a design method for a magnetic levitation bearing and a magnetic levitation bearing itself. Background Technology

[0002] Traditional industrial motors in my country are supported by mechanical bearings. Due to the friction of these bearings and rotor vibration, these motors can only operate at low speeds and have low power density and efficiency. Therefore, some industrial applications require high-speed motors supported by magnetic levitation bearings, which eliminate friction and wear, require no lubrication, can reach speeds of tens of thousands of revolutions per minute, and offer advantages such as high power density, small size, light weight, and fast response. However, most magnetic levitation bearings currently operate in medium- and low-temperature environments, and there are no suitable magnetic levitation bearings for use in high-temperature environments. Summary of the Invention

[0003] To overcome the problems existing in related technologies, this disclosure provides a design method for a magnetic levitation bearing and a magnetic levitation bearing.

[0004] According to a first aspect of the present disclosure, a design method for a magnetic levitation bearing is provided, the design method comprising:

[0005] Obtain key parameters of magnetic levitation bearings affected by high temperatures;

[0006] Based on the key parameters, construct a parametric model of the target design parameters for the magnetic levitation bearing;

[0007] Based on the parameter models, determine the parameter values ​​of each target design parameter at the target temperature.

[0008] This design method can analyze the functional parameters of the magnetic levitation bearing affected by high temperature environments, and adjust the relevant design parameters of the magnetic levitation bearing based on these functional parameters. The magnetic levitation bearing designed using the design method provided in this disclosure can be adapted to use in high temperature environments.

[0009] In some embodiments, obtaining key parameters of the magnetic levitation bearing affected by high temperature includes:

[0010] Construct a force model for the magnetic levitation bearing;

[0011] Construct a voltage-current model;

[0012] Based on the force model and voltage-current model, the key parameters affected by high temperature are determined.

[0013] By establishing force and voltage-current models for magnetic levitation bearings, the functional parameters of magnetic levitation bearings affected by high temperatures can be made more intuitive, and some functional parameters can be prevented from being missed.

[0014] In some embodiments, the force model includes:

[0015]

[0016] In the formula: It is a differential electromagnetic force. This refers to the number of turns of the magnetic levitation bearing coil. and These are the bias current and control current values ​​for the magnetic levitation bearing, respectively. This refers to the air gap value between the stator and rotor of the magnetic levitation bearing. This represents the displacement change value. The permeability of free space, The magnetic pole area of ​​the magnetic levitation bearing. This is the effective value of the length of the core material of the magnetic levitation bearing. The relative permeability of the core material of the magnetic levitation bearing;

[0017] Based on the force model and voltage-current model, the key parameters affected by high temperature are determined, including:

[0018] Based on the force model, the key parameters affected by high temperature are determined to be the air gap between the stator and rotor of the magnetic levitation bearing and the relative permeability of the core material of the magnetic levitation bearing.

[0019] By establishing the above-mentioned force model, it is possible to accurately identify the key parameters that are affected by high temperature, such as the air gap between the stator and rotor of the magnetic levitation bearing and the relative permeability of the core material of the magnetic levitation bearing.

[0020] In some embodiments, the target design parameters include the stator pole area. Based on the key parameters, a parametric model of the target design parameters of the magnetic levitation bearing is constructed, including:

[0021] A first correspondence relationship is established between the air gap between the stator and rotor of the magnetic levitation bearing, the relative permeability of the core material of the magnetic levitation bearing, and the stator magnetic pole area. This first correspondence relationship is used as a parameter model for the stator magnetic pole area.

[0022] Based on the correspondence between key parameters and stator pole area, a parametric model of stator pole area is established. Using this parametric model, the design value of stator pole area can be quickly calculated according to actual design requirements, thus improving design efficiency.

[0023] In some embodiments, determining the parameter values ​​of each target design parameter at the target temperature based on each parameter model includes:

[0024] Determine the target air gap value between the stator and rotor of the magnetic levitation bearing and the target relative permeability value of the core material of the magnetic levitation bearing at the target temperature.

[0025] Based on the first correspondence, the target air gap value, and the target relative permeability value, the area value of the stator magnetic pole area at the target temperature is determined.

[0026] By substituting the target air gap value and the target relative permeability value into the first correspondence, the area value of the stator magnetic pole at the target temperature can be directly obtained, making the design of the stator magnetic pole area value more convenient and faster.

[0027] In some embodiments, the voltage-current model includes:

[0028] ;

[0029] ;

[0030] ;

[0031] ;

[0032] ;

[0033] ;

[0034] ;

[0035] in, To control the current derivative matrix, For bearing winding inductance array, For bearing winding control current array, The coupling array between the number of bearing winding turns and the rotor motion state For the bearing winding bias current and rotor motion state array, For bearing winding resistor array, For the voltage array at both ends of the bearing winding, and They are respectively The bearing winding resistance of the directional channel and They are respectively Voltage of the directional channel;

[0036] Based on the force model and voltage-current model, the key parameters affected by high temperature are determined, including:

[0037] Based on the voltage-current model, the bearing winding resistance is determined to be a key parameter affected by high temperature.

[0038] By establishing the voltage-current model described above, it is possible to accurately identify that the bearing winding resistance is also a key parameter affected by high temperature.

[0039] In some embodiments, the target design parameters include the number of coil turns. Based on the key parameters, a parametric model of the target design parameters of the magnetic levitation bearing is constructed, including:

[0040] A second correspondence is established between the maximum allowable current in the winding conductor and the number of coil turns, and this second correspondence is used as a parametric model for the number of coil turns.

[0041] Based on the correspondence between key parameters and the number of coil turns, a parametric model of the number of coil turns is established. Using this parametric model, the design value of the number of coil turns can be quickly calculated according to actual design requirements, thus improving design efficiency.

[0042] In some embodiments, determining the parameter values ​​of each target design parameter at the target temperature based on each parameter model includes:

[0043] Determine the resistance value of the bearing winding at the target temperature;

[0044] Based on the resistance value of the bearing winding, determine the target current value of the maximum allowable current to flow through the winding conductor at the target temperature;

[0045] Based on the second correspondence and the target current value, the number of coil turns at the target temperature is determined.

[0046] In some embodiments, the design method for magnetic levitation bearings further includes:

[0047] The size of the winding cavity is determined based on the number of coil turns at the target temperature.

[0048] By substituting the target current value into the second correspondence, the number of coil turns at the target temperature can be obtained directly, making the design of the number of coil turns more convenient and faster.

[0049] According to a second aspect of the present disclosure, a magnetic levitation bearing is provided, which is designed using the magnetic levitation bearing design method of the first aspect of the present disclosure.

[0050] This magnetic levitation bearing can be used in high-temperature environments, which means that the application environment of magnetic levitation bearings is no longer limited to medium and low temperature environments. This not only expands the applicable temperature range of magnetic levitation bearings, but also increases the application scenarios of magnetic levitation bearings.

[0051] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0052] This disclosure provides a design method for magnetic levitation bearings. The design method provided by this disclosure can analyze the functional parameters of magnetic levitation bearings affected by high-temperature environments, and adjust the relevant design parameters of magnetic levitation bearings based on these functional parameters. Magnetic levitation bearings designed using the design method provided by this disclosure can be adapted to use in high-temperature environments, so that the application environment of magnetic levitation bearings is no longer limited to medium and low temperature environments. This not only expands the applicable temperature range of magnetic levitation bearings, but also increases the application scenarios of magnetic levitation bearings.

[0053] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0054] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0055] Figure 1 This is a flowchart illustrating a design method for a magnetic levitation bearing according to an exemplary embodiment;

[0056] Figure 2 This is a structural diagram of a magnetic levitation bearing according to an exemplary embodiment.

[0057] In the picture:

[0058] 1. Magnetic levitation bearing mounting sleeve; 2. First stator core; 3. First stator winding coil; 4. Magnetic levitation bearing rotor; 5. Second stator core; 6. Second stator winding coil. Detailed Implementation

[0059] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present invention.

[0060] In related technologies, conventional magnetic levitation bearings are only suitable for use in low to medium temperature environments (below 200°C). When faced with higher ambient temperatures (such as 500°C), conventional magnetic levitation bearings cannot work properly in such environments.

[0061] To overcome this technical problem, an exemplary embodiment of this disclosure provides a design method for a magnetic levitation bearing. This design method enables the design of magnetic levitation bearings tailored to different ambient temperatures. For ease of understanding, the structure of the magnetic levitation bearing provided in the exemplary embodiment of this disclosure is first described, as follows: Figure 2 As shown, the magnetic levitation bearing includes: a first stator core 2, a second stator core 5, a first stator winding coil 3, a second stator winding coil 6, a magnetic levitation bearing rotor 4, and a magnetic levitation bearing mounting sleeve 1. The second stator core is arranged opposite to the first stator core. The first stator winding coil is located on the side of the first stator core facing the second stator core, and the second stator winding coil is located on the side of the second stator core facing the first stator core. The magnetic levitation bearing rotor 4 is located between the first stator core and the second stator core, and the magnetic levitation bearing mounting sleeve 1 is fitted over the first stator core and the second stator core.

[0062] In one example, such as Figure 2 As shown, the center horizontal line of the magnetic levitation bearing is defined as... The shaft channel, with the center of the magnetic levitation bearing as the origin, and the end closest to the first stator core as... In the axial direction, the end closest to the second stator core is Axial direction.

[0063] In this example, the first stator core 2 is Stator core, first stator winding coil 3 is Stator winding coils, second stator core 5 is Stator core, second stator winding coil 6 Stator winding coil.

[0064] In an exemplary embodiment of this disclosure, a design method for a magnetic levitation bearing is provided, such as... Figure 1 As shown, the design method includes:

[0065] S1. Obtain the key parameters of the magnetic levitation bearing affected by high temperature.

[0066] In high-temperature environments, various parameters of magnetic levitation bearings change, affecting their performance. This step involves, for example, establishing a specific model to accurately identify key parameters significantly affected by high temperatures and crucial to bearing performance, providing a foundation for subsequent design.

[0067] S2. Based on the key parameters, construct a parametric model of the target design parameters for the magnetic levitation bearing.

[0068] In this step, based on the acquired key parameters, a mathematical relationship or correspondence is established between the key parameters and the target design parameters, forming a parameter model. This parameter model can reflect the influence of changes in key parameters on the target design parameters.

[0069] S3. Based on the parameter models, determine the parameter values ​​of each target design parameter at the target temperature.

[0070] In this step, after determining the target temperature, the actual values ​​of key parameters and relevant design indicators at that temperature are substituted into the parameter model. Through calculation and analysis, the specific parameter values ​​of each target design parameter at the target temperature are obtained, thereby completing the determination of the design parameters of the magnetic levitation bearing at the target temperature.

[0071] In step S1, the high temperature that the magnetic levitation bearing withstands can be arbitrarily set according to its target application environment, but it cannot exceed the temperature limit that the magnetic levitation bearing material can withstand. In this embodiment, the high temperature that the magnetic levitation bearing withstands is set to 500°C. The key parameter obtained is a parameter that is strongly correlated with temperature changes, that is, when the temperature changes, this parameter will also change accordingly.

[0072] In one exemplary embodiment, key parameters of the magnetic levitation bearing affected by high temperature are obtained by establishing a force model and a voltage-current model of the magnetic levitation bearing.

[0073] Since magnetic levitation bearings operate on the principle of levitation and control of the rotor based on electromagnetic force, accurately constructing a force model can provide a detailed description of the relationship between electromagnetic force and various parameters during operation. A voltage-current model can describe the relationship between voltage, current, and other relevant parameters in the magnetic levitation bearing windings, which is crucial for analyzing the electrical characteristics and control performance of the bearing. Therefore, by analyzing these two models and considering the changes in material properties and electromagnetic characteristics under high-temperature conditions, key parameters affected by high temperatures can be determined.

[0074] The key parameters of magnetic levitation bearings affected by high temperature can be obtained through various methods such as experimental observation and model analysis. In this embodiment, the method for obtaining the key parameters of magnetic levitation bearings affected by high temperature is to establish a relevant model of the magnetic levitation bearing and obtain the target key parameters through model analysis.

[0075] In one exemplary embodiment, the force model includes:

[0076]

[0077] In the formula: It is a differential electromagnetic force. This refers to the number of turns of the magnetic levitation bearing coil. and These are the bias current and control current values ​​for the magnetic levitation bearing, respectively. This refers to the air gap value between the stator and rotor of the magnetic levitation bearing. This represents the displacement change value. The permeability of free space, The magnetic pole area of ​​the magnetic levitation bearing. This is the effective value of the length of the core material of the magnetic levitation bearing. denoted as ρ, which represents the relative permeability of the core material of the magnetic levitation bearing.

[0078] By establishing the above force model, we can analyze the various parameters to identify the key parameters affected by temperature.

[0079] To obtain the above force model, it is first necessary to establish the differential electromagnetic force of the x-axis channel of the magnetic levitation bearing. The expression, in this embodiment, The expression is:

[0080]

[0081] In the formula: and They are magnetic levitation bearings Magnetic force generated in the axial direction, It is half the angle between two adjacent upper and lower magnetic poles of a magnetic levitation bearing. and They are magnetic levitation bearings Magnetic flux generated by the axial channel is the vacuum permeability.

[0082] Then Substituting the expression into In the expression, the formula will be... and By making the substitutions, the force model can be obtained.

[0083] like Figure 2 As shown, the air gap value g between the stator and rotor of the magnetic levitation bearing is the gap between the first stator core 2 or the second stator core 5 and the magnetic levitation bearing rotor 4. When the temperature changes, the mechanical dimensions of each component of the magnetic levitation bearing will also change due to thermal expansion and contraction. Therefore, the air gap value g between the stator and rotor of the magnetic levitation bearing will inevitably change, and this change value is the displacement change value. Furthermore, based on the properties of the magnetic bearing core material, it is known that the relative permeability of the magnetic bearing core material changes with temperature. It will also change. And the air gap value between the stator and rotor of the magnetic levitation bearing... The relative permeability of the core material of the magnetic levitation bearing Apart from these, all other parameters are constant values ​​generated by the magnetic levitation bearing itself or during its operation, and these parameters do not change with temperature variations. Therefore, the air gap value between the stator and rotor of the magnetic levitation bearing... The relative permeability of the core material of the magnetic levitation bearing These are the key parameters that affect magnetic levitation bearings when exposed to high temperatures.

[0084] In an exemplary embodiment, the target design parameters include the stator pole area. Based on the key parameters, a parametric model of the target design parameters of the magnetic levitation bearing is constructed, including:

[0085] A primary correspondence is established between the air gap between the stator and rotor of the magnetic levitation bearing, the relative permeability of the core material of the magnetic levitation bearing, and the stator pole area. This primary correspondence is used as a parametric model for the stator pole area. Through this primary correspondence, the specific design parameters for the stator pole area can be obtained according to design requirements.

[0086] Among them, the first correspondence between the air gap between the stator and rotor of the magnetic levitation bearing, the relative permeability of the core material of the magnetic levitation bearing, and the stator magnetic pole area is as follows:

[0087]

[0088] In the formula: This represents the maximum load-bearing capacity of the magnetic levitation bearing. It is the saturation magnetic flux density of the soft magnetic material in the core of a magnetic levitation bearing at the operating temperature.

[0089] Among them, the maximum load capacity of magnetic levitation bearings Generally, the design parameters should be determined based on the gyroscopic torque generated by the rotor torque of the magnetic bearing system and the weight of the rotor assembly. To ensure the design specifications are met, the designed magnetic levitation bearing should satisfy the maximum load-bearing capacity specified in the design parameters. Requirements.

[0090] In an exemplary embodiment, the parameter values ​​of each target design parameter at the target temperature are determined according to each parameter model, including: determining the target air gap value between the stator and rotor of the magnetic levitation bearing and the target relative permeability value of the core material of the magnetic levitation bearing at the target temperature;

[0091] Based on the first correspondence, the target air gap value, and the target relative permeability value, the area value of the stator magnetic poles at the target temperature is determined. The stator magnetic pole area at the target temperature can be determined by substituting the target design parameters into the first correspondence.

[0092] The following equation applies to the relationship between the stator pole area and the saturation magnetic flux density of the soft magnetic material in the core of a magnetic levitation bearing:

[0093]

[0094] Based on the force model, we can obtain... The specific expression is:

[0095]

[0096] The equation relating the stator pole area and the saturation magnetic flux density of the soft magnetic material in the core of the magnetic levitation bearing and Substituting the specific expression into the first correspondence, we can obtain the target air gap value between the stator and rotor of the magnetic levitation bearing and the target relative permeability value of the core material of the magnetic levitation bearing, and thus determine the area value of the stator magnetic pole area at the target temperature.

[0097] The target air gap value between the stator and rotor of the magnetic levitation bearing is:

[0098]

[0099] In the formula: This refers to the air gap value between the stator and rotor of the magnetic levitation bearing, i.e., the target air gap value. The value represents the air gap between the stator and rotor of the magnetic levitation bearing at 20℃. This represents the change in air gap size at the operating temperature of the magnetic levitation bearing.

[0100] Therefore, as long as the change in air gap size at the operating temperature of the magnetic levitation bearing is obtained... This yields the target air gap value, which is the change in air gap size at the operating temperature of the magnetic levitation bearing. This can be obtained from the changes in the mechanical dimensions of the magnetic levitation bearing components at operating temperatures, as follows:

[0101]

[0102] In the formula: This represents the change in air gap size at the operating temperature of the magnetic levitation bearing. The inner diameter of the stator of the magnetic levitation bearing is given at 20℃. The coefficient of thermal expansion of the core material of the magnetic levitation bearing. This refers to the operating temperature of the magnetic levitation bearing. The temperature is 20℃.

[0103] In this embodiment, the target relative permeability value of the magnetic bearing core material is:

[0104]

[0105] In the formula: The relative permeability of the bearing core material at the operating temperature. The relative permeability of the bearing core material at 20℃. This refers to the Curie temperature of the bearing core material.

[0106] In one exemplary embodiment, the voltage-current model includes:

[0107] ;

[0108] ;

[0109] ;

[0110] ;

[0111] ;

[0112] ;

[0113] ;

[0114] in, To control the current derivative matrix, For bearing winding inductance array, For bearing winding control current array, The coupling array between the number of bearing winding turns and the rotor motion state For the bearing winding bias current and rotor motion state array, For bearing winding resistor array, For the voltage array at both ends of the bearing winding, and They are respectively The bearing winding resistance of the directional channel and They are respectively Voltage of the directional channel.

[0115] By establishing the voltage-current model described above, we can analyze the various parameters to identify the key parameters that are affected by temperature.

[0116] To obtain the voltage-current model, it is first necessary to calculate the voltage at the coil winding terminals. The total magnetic flux of the magnetic levitation bearing coil winding Calculation yields:

[0117]

[0118] In the formula: The resistance of the magnetic levitation bearing coil winding pair, This refers to the current flowing through the coil. Since the unidirectional stator core coil winding of the magnetic bearing uses a series connection, the total number of turns in the coil winding is... Magnetic flux of each channel of the magnetic bearing Taking the derivative, we get:

[0119]

[0120] In the formula: and They are respectively Magnetic resistance generated by the directional channel.

[0121] The magnetic flux of each channel of the magnetic bearing will be measured. Substituting the derivative into the voltage at the coil winding terminals... From the expression, we can obtain:

[0122]

[0123] Expanding the equation by substituting the terms into the given expressions yields the voltage-current model. Analyzing the parameters in the voltage-current model reveals the bearing winding resistance. The resistance increases with increasing temperature, thus affecting the relationship between current and voltage. Therefore, the bearing winding resistance is determined. These are key parameters affected by high temperatures. (Except for the air gap value between the stator and rotor of the magnetic levitation bearing.) Relative permeability of the core material of magnetic levitation bearing and bearing winding resistance Apart from the air gap between the stator and rotor of the magnetic levitation bearing, all other parameters are constant values ​​generated by the magnetic levitation bearing itself or during its operation, and these parameters do not change with temperature variations. The relative permeability of the core material of the magnetic levitation bearing In addition, bearing winding resistance It is also a key parameter for magnetic levitation bearings to be affected by high temperature.

[0124] In an exemplary embodiment, the target design parameters include the number of coil turns. Based on the key parameters, a parametric model of the target design parameters of the magnetic levitation bearing is constructed, including:

[0125] A second correspondence is established between the maximum allowable current flowing through the winding conductor and the number of coil turns, and this second correspondence serves as a parametric model for the number of coil turns. Using this second correspondence, the specific design parameters for the number of coil turns can be obtained according to design requirements.

[0126] The second correspondence between the maximum allowable current through the winding conductor and the number of coil turns is as follows:

[0127]

[0128] In the formula: The magnetic flux in the air gap between the magnetic poles at the equilibrium position under operating temperature of the magnetic bearing. This is the maximum current allowed to flow through the winding conductor at its operating temperature. The magnetic reluctance of the air gap at the equilibrium position of the magnetic poles is denoted by .

[0129] In one exemplary embodiment, determining the parameter values ​​of each target design parameter at the target temperature based on each parameter model includes:

[0130] Determine the resistance value of the bearing winding at the target temperature;

[0131] Based on the resistance value of the bearing winding, determine the target current value of the maximum allowable current to flow through the winding conductor at the target temperature;

[0132] Based on the second correspondence and the target current value, the number of coil turns at the target temperature is determined.

[0133] By substituting the target design parameters into the second correspondence, the design value of the number of coil turns at the target temperature can be determined.

[0134] The resistance value of the bearing winding at the target temperature can be determined by the following expression:

[0135]

[0136] In the formula: This represents the resistance value of the magnetic levitation bearing winding at operating temperature. The resistance value of the magnetic levitation bearing winding at 20℃. The temperature coefficient of the winding coil, This refers to the operating temperature of the magnetic levitation bearing.

[0137] By setting the target temperature to the operating temperature of the magnetic levitation bearing, the resistance value of the bearing winding at that temperature can be obtained. Simultaneously, by applying Ohm's law, the target current value—the maximum allowable current flowing through the winding conductors at that temperature—can be determined. The value of .

[0138] Finally, by substituting the values ​​according to the second correspondence, the number of coil turns at the target temperature can be obtained. The value.

[0139] In one exemplary embodiment, the design method for a magnetic levitation bearing further includes: determining the size of the winding cavity based on the number of coil turns at a target temperature.

[0140] After determining the number of coil turns, the required space for the winding can be calculated based on the winding method and size requirements. This determines the appropriate size of the winding cavity, ensuring the slot fill factor of the magnetic bearing stator is within a suitable range. This guarantees sufficient installation and heat dissipation space for the winding coil, allowing for proper installation and normal operation. Based on the principle that the product of the current area and current density equals the number of winding turns, and considering the load factor of the winding cavity, we can obtain:

[0141]

[0142] In the formula: , , and These are the current area, winding cavity area, winding height, and winding cavity width, respectively. Among them, when the number of coil turns is fixed, the current area... and winding height All are constant values, winding cavity area and winding cavity width These are the design parameters for the winding cavity dimensions. In this embodiment, to reduce the impact of temperature on the resistance of the magnetic bearing winding coil, the high-temperature magnetic bearing adopts a double-strand parallel winding method. This is the load factor (generally taken as 0.6).

[0143] Simplifying the above equation, we get:

[0144]

[0145] according to , and These are the maximum current density and the cross-sectional area of ​​the winding coil, respectively, at the operating temperature. Generally .Will Substituting into the above formula, we can obtain the winding cavity area. The value is based on the winding cavity area. The winding cavity width can be calculated from the given value. The value. Based on the winding cavity area. and winding cavity width This allows for the design of the winding cavity dimensions.

[0146] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein.

[0147] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. A design method for a magnetic levitation bearing, characterized in that, The design method includes: S1. Obtain the key parameters of the magnetic levitation bearing affected by high temperature; S2. Based on the key parameters, construct a parametric model of the target design parameters for the magnetic levitation bearing; S3. Based on the parameter models described above, determine the parameter values ​​of each of the target design parameters at the target temperature; In step S1, obtaining the key parameters of the magnetic levitation bearing affected by temperature includes: Construct the force model of the magnetic levitation bearing; Construct a voltage-current model; Based on the force model and the voltage-current model, the key parameters affected by high temperature are determined; The determination of key parameters affected by high temperature based on the force model and the voltage-current model includes: Based on the force model, the air gap between the stator and rotor of the magnetic levitation bearing and the relative permeability of the core material of the magnetic levitation bearing are determined to be the key parameters affected by temperature. The determination of the key parameters affected by temperature based on the force model and the voltage-current model includes: Based on the voltage-current model, the bearing winding resistance is determined to be the key parameter affected by temperature. In step S2, constructing a parametric model of the target design parameters for the magnetic levitation bearing based on the key parameters includes: A first correspondence is established between the air gap between the stator and rotor of the magnetic levitation bearing, the relative permeability of the core material of the magnetic levitation bearing, and the area of ​​the stator magnetic poles. The first correspondence is used as a parameter model for the area of ​​the stator magnetic poles. A second correspondence is established between the maximum allowable current to flow through the winding conductor and the number of coil turns, and this second correspondence is used as a parameter model for the number of coil turns. In step S3, determining the parameter values ​​of each target design parameter at the target temperature based on each parameter model includes: Determine the target air gap value between the stator and rotor of the magnetic levitation bearing and the target relative permeability value of the core material of the magnetic levitation bearing at the target temperature. Based on the first correspondence, the target air gap value, and the target relative permeability value, the area value of the stator magnetic pole area at the target temperature is determined; Determine the resistance value of the bearing winding at the target temperature; Based on the resistance value of the bearing winding, determine the target current value of the maximum allowable current to flow through the winding conductor at the target temperature; Based on the second correspondence and the target current value, the number of coil turns at the target temperature is determined.

2. The design method of a magnetic levitation bearing according to claim 1, characterized in that, The force model includes: In the formula: It is a differential electromagnetic force. This refers to the number of turns of the magnetic levitation bearing coil. and These are the bias current and control current values ​​for the magnetic levitation bearing, respectively. This refers to the air gap value between the stator and rotor of the magnetic levitation bearing. This represents the displacement change value. The permeability of free space, The magnetic pole area of ​​the magnetic levitation bearing. This is the effective value of the length of the core material of the magnetic levitation bearing. denoted as ρ, which represents the relative permeability of the core material of the magnetic levitation bearing.

3. The design method for a magnetic levitation bearing according to claim 2, characterized in that, The voltage-current model includes: ； ； ； ； ； ； ； in, To control the current derivative matrix, For bearing winding inductance array, For bearing winding control current array, The coupling array between the number of bearing winding turns and the rotor motion state For the bearing winding bias current and rotor motion state array, For bearing winding resistor array, For the voltage array at both ends of the bearing winding, and They are respectively The bearing winding resistance of the directional channel and They are respectively Voltage of the directional channel.

4. The design method of a magnetic levitation bearing according to claim 1, characterized in that, The design method for the magnetic levitation bearing also includes: The size of the winding cavity is determined based on the number of coil turns at the target temperature.

5. A magnetic levitation bearing, characterized in that, The magnetic levitation bearing is designed using the magnetic levitation bearing design method as described in any one of claims 1-4.

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