A multi-objective optimization method for cooling a magnetic device structure of a space power supply based on a phase change material

Abstract

A multi-objective optimization method for cooling space power magnetic device structure based on phase change material, relates to the technical field of space power magnetic device cooling. The magnetic device cooling structure is designed, the phase change material is sealed and wrapped on the surface of the magnetic core of the magnetic device through the packaging shell, the model is established by relying on COMSOL Multiphysics, the thickness variable assignment range of the phase change material is set to obtain different sizes of the magnetic device cooling structure, the steady-state parameterization scanning is carried out, the unit volume effective cooling capacity and the unit mass effective cooling capacity of the winding and the magnetic core are calculated, the unit cooling cost of the winding and the magnetic core is calculated, and the best thickness value of the phase change material is obtained by relying on Origin to fit the curve and obtain the average value. Based on the high latent heat property of the phase change material, the space power magnetic device is cooled, and the multi-objective optimization considering the volume, mass, material cost and carrying cost is comprehensively considered, so that the better cooling effect is obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of space power magnetic device cooling, and particularly relates to a multi-objective optimization method for a structure of a space power magnetic device cooled by a phase change material. BACKGROUND

[0002] The magnetic device of the space power in the space cabin is heated and warmed due to the adverse heat dissipation condition, which can cause the magnetic permeability of the device to decrease, the saturation magnetic flux density to decrease, the loss to increase, the inductance to change, and the device to be damaged, etc.

[0003] Cooling electronic devices by using phase change materials with high latent heat is a widely used method at present, but for actual aerospace problems, the material cost and the carrying cost, and the limited carrying mass and carrying volume in the carrying plan, etc. Realistic factors cannot be separated from the needs of actual engineering design, and must be carefully designed and considered before use.

[0004] Therefore, it is urgent to propose a multi-objective structure optimization method considering the carrying volume, the carrying mass, the material cost and the carrying cost, aiming to find the best structure size of the space power magnetic device, so as to reduce the temperature of the magnetic device as much as possible while maximizing the reduction of material and carrying cost. It is of great significance for space-related technicians and engineers to determine the optimal design parameters of the power magnetic device from the perspective of multiple aspects and multiple targets. SUMMARY

[0005] To solve the problems in the background art, the present application provides a multi-objective optimization method for a structure of a space power magnetic device cooled by a phase change material, which cools the space power magnetic device based on the high latent heat property of the phase change material, and comprehensively considers multi-objective optimization including volume, mass, material cost and carrying cost, to obtain better cooling effect.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a multi-objective optimization method for a structure of a space power magnetic device cooled by a phase change material, comprising the following steps:

[0007] S1, the bottom of the magnetic device is positioned and supported by an aluminum support plate, a magnetic device cooling structure is designed, a phase change material is sealed and wrapped by a packaging shell on the surface of the magnetic core of the magnetic device, and the phase change material is in contact with the surface of the magnetic core of the magnetic device;

[0008] S2, a model of the magnetic device and the aluminum support plate is established in COMSOL Multiphysics, the actual heat generation power, material parameters and boundary conditions of the winding and the magnetic core in the magnetic device are given, and the initial temperature T w0 and T m0 of the winding and the magnetic core are obtained by using a domain probe.

[0009] S3. In COMSOL Multiphysics, a model of the cooling structure of the magnetic device is established. The thickness of the phase change material and the packaging shell are modeled parametrically, using the thickness variable d of the phase change material. pcm control;

[0010] S4. Set the thickness variable d pcm The assignment range is range(a, c, b), where a and b are the upper and lower limits, respectively, and c is the variable step size. Therefore, there are (ba) / c+1 distinct values ​​for d. pcm The values ​​correspond to the cooling structures of magnetic devices of different sizes;

[0011] S5. Perform steady-state parameterized scanning and use a domain probe to obtain different d values. pcm The value corresponds to the average temperature T of the winding and the magnetic core. w1 ,T w2 ,…,T w((b-a) / c+1) With T m1 ,T m2 ,…,T m((b-a) / c+1) ;

[0012] S6. Calculate the temperature reduction of the winding and the magnetic core, respectively, in T... w0 -T w1 ,T w0 -T w2 ,…,T w0 -T w((b-a) / c+1) and T m0 -T m1 ,T m0 -T m2 ,…,T m0 -T m((b-a) / c+1) ;

[0013] S7. Calculate the thickness variable d for different thicknesses. pcm The total volume V1, V2, ..., V of the corresponding magnetic device cooling structure ((b-a) / c+1) and total mass m1, m2, ..., m ((b-a) / c+1) ;

[0014] S8. Calculate the effective cooling capacity per unit volume of the winding and the magnetic core, respectively (T). w0 -T wi ) / V i and (T) m0 -T mi ) / V i , i=1,2,…,(ba) / c+1;

[0015] S9. Calculate the effective cooling capacity per unit mass of the winding and the magnetic core, respectively (T) w0 -T wi ) / mi and (T) m0 -T mi ) / m i , i=1,2,…,(ba) / c+1;

[0016] S10, Calculate material costs C c1 C c2 ,…,C c((b-a) / c+1) and transportation cost C t1 C t2 ,…,C t((b-a) / c+1) The total cost C c1 +C t1 C c2 +C t2 ,…,C c((b-a) / c+1) +C t((b-a) / c+1) ;

[0017] S11. Calculate the unit cooling cost of the winding and the magnetic core, respectively (C ci +C ti ) / (T w0 -T wi ) and (C ci +C ti ) / (T m0 -T mi ), i=1,2,…,(ba) / c+1;

[0018] S12. Using Origin, fit four sets of data on effective cooling capacity per unit volume and unit cooling cost into curves, and calculate the average x-coordinate of the intersection point of the four curves. v ;

[0019] S13. Using Origin, fit four sets of data on effective cooling capacity per unit mass and unit cooling cost into curves, and calculate the average x-coordinate of the intersection point of the four curves. m ;

[0020] S14, Find x v and x m average x c This is the optimal thickness value for the phase change material, which is used to guide the design of cooling structures for magnetic devices.

[0021] Further, the magnetic device cooling structure comprises an upper side packaging shell, a right side packaging shell, a front side packaging shell, a rear side packaging shell, a left side packaging shell and phase change material; the front side packaging shell is in the shape of a mouth and is matched to abut against the front side surface of the magnetic core of the magnetic device, the rear side packaging shell is in the shape of n and is matched to abut against the rear side surface of the magnetic core of the magnetic device, the left side packaging shell and the right side packaging shell are symmetrically clamped on the left and right sides of the magnetic core of the magnetic device, the upper side packaging shell is capped on the top of the magnetic core of the magnetic device, and the phase change material is filled in each packaging shell, and the joint positions of the packaging shells are sealed.

[0022] Further, the middle hollowed areas of the front side packaging shell and the rear side packaging shell expose the winding of the magnetic device to the environment, and the bottom of the rear side packaging shell is open for avoiding the wiring part of the magnetic device.

[0023] Further, the packaging shells are made of aluminum alloy material, and the shell thicknesses of the packaging shells are the same.

[0024] Further, in the step S12, when the four curves are drawn, the horizontal axis is the thickness variable d of the phase change material pcm , and the left and right vertical axes are the unit volume effective cooling capacity and the unit cooling cost respectively; in the step S13, when the four curves are drawn, the horizontal axis is the thickness variable d of the phase change material pcm , and the left and right vertical axes are the unit mass effective cooling capacity and the unit cooling cost respectively.

[0025] Compared with the prior art, the present application has the beneficial effects that: the present application cools the space power magnetic device based on the high latent heat property of the phase change material, and specifically adopts the multi-objective optimization method, mainly associates the cooling capacity effect of the cooling structure with the volume and mass of the cooling structure, and also considers the material cost and the carrying cost in the optimization range for the engineering practice, so as to obtain better cooling effect as far as possible under the premise of smaller volume and mass, lower material cost and carrying cost, and has deep engineering practical significance. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic diagram of the main structure of the space power magnetic device;

[0027] Figure 2 is a schematic diagram of the assembly of the magnetic device cooling structure in the method of the present application;

[0028] Figure 3 is an exploded schematic diagram of the magnetic device cooling structure in the method of the present application;

[0029] Figure 4 is a temperature distribution diagram of the magnetic device in the embodiment without using the method of the present application;

[0030] Figure 5is a temperature distribution diagram of a magnetic device in an embodiment in which the method of the present application has been adopted;

[0031] Figure 6 is a relationship curve between unit volume effective cooling capacity and unit cooling cost in an embodiment;

[0032] Figure 7 is a relationship curve between unit mass effective cooling capacity and unit cooling cost in an embodiment.

[0033] In the figure: 1, magnetic device; 2, aluminum support plate; 3, upper side phase change material; 4, upper side packaging shell; 5, right side phase change material; 6, right side packaging shell; 7, front side phase change material; 8, front side packaging shell; 9, rear side phase change material; 10, rear side packaging shell; 11, left side phase change material; 12, left side packaging shell. DETAILED DESCRIPTION

[0034] The technical solutions in the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] The main structure of the magnetic device of the space power supply is shown in Figure 1 , mainly including a magnetic core, a winding and a wiring part, and the structure is not front-back symmetrical.

[0036] The method of using high latent heat phase change material for cooling the magnetic device of the space power supply is widely used, but the cooling capacity of the cooling structure, the volume, mass, cost and other practical factors of the space carrier need to be considered comprehensively. In view of this, the present application proposes a multi-objective optimization method for the cooling structure, which finds the best structure size to guide the design while considering the multi-objective structure optimization of volume, mass, material cost and transportation cost, meeting the needs of engineering and practice.

[0037] The present application first proposes a magnetic device cooling structure using phase change material and related aluminum alloy packaging shell for cooling and cooling of the magnetic device of the space power supply, but the focus of the innovation is a multi-objective optimization method based on the magnetic device cooling structure. In order to find the optimal structure size, the design of the optimal size makes the magnetic device cooling structure as a whole to meet better cooling capacity and also maintain lower economic cost.

[0038] As shown in Figures 2-3 , a multi-objective optimization method for a phase change material-based cooling structure of a magnetic device of a space power supply includes the following steps:

[0039] Magnetic device cooling structure:

[0040] The bottom of the magnetic device 1 is supported and positioned by an aluminum support plate 2. A magnetic device cooling structure is designed for the magnetic device of the space power supply based on the latent heat principle of phase change materials, including an upper side phase change material 3, an upper side packaging shell 4, a right side phase change material 5, a right side packaging shell 6, a front side phase change material 7, a front side packaging shell 8, a rear side phase change material 9, a rear side packaging shell 10, a left side phase change material 11, and a left side packaging shell 12. Among them:

[0041] The front side packaging shell 8 is in the shape of a mouth and is attached to the front side surface of the magnetic core of the magnetic device 1. Due to the presence of the wiring part of the magnetic device 1, the shape of the rear side packaging shell 10 is different from that of the front side packaging shell 8. The rear side packaging shell 10 is in the shape of n and is attached to the rear side surface of the magnetic core of the magnetic device 1. The middle hollow area of the front side packaging shell 8 and the rear side packaging shell 10 exposes the winding of the magnetic device 1 to the environment, and the bottom of the rear side packaging shell 10 is open for the wiring part of the magnetic device 1 to avoid. The left side packaging shell 12 and the right side packaging shell 6 are symmetrically clamped on the left and right sides of the magnetic core of the magnetic device 1. Both are rectangular structures and are flush with the front side packaging shell 8 and the rear side packaging shell 10 on the front and back sides. The upper side packaging shell 4 is a cap on the top of the magnetic core of the magnetic device 1. It is also a rectangular structure and the edges are flush with the front side packaging shell 8, the rear side packaging shell 10, and the left side packaging shell 12 and the right side packaging shell 6. The inside of each packaging shell is filled with phase change material, which is in contact with the surface of the magnetic core of the magnetic device 1. The inside of the upper side packaging shell 4 is filled with the upper side phase change material 3, the inside of the right side packaging shell 6 is filled with the right side phase change material 5, the inside of the front side packaging shell 8 is filled with the front side phase change material 7, the inside of the rear side packaging shell 10 is filled with the rear side phase change material 9, and the inside of the left side packaging shell 12 is filled with the left side phase change material 11. Each packaging shell is made of thin-walled aluminum alloy material to enhance the radiation heat transfer capacity of the outer surface to the environment, and the joint positions of each packaging shell are sealed.

[0042] Multi-objective optimization method:

[0043] S1, the method is based on the above-mentioned magnetic device cooling structure, and relies on three-dimensional multi-physical field coupling simulation software COMSOL Multiphysics and data image processing software Origin;

[0044] S2, a model of the magnetic device 1 and the aluminum support plate 2 is established in COMSOL Multiphysics, the actual heat power, material parameters, and boundary conditions of the winding and the magnetic core in the magnetic device 1 are given, and calculation is performed. The domain probe is used to obtain the initial temperature of the winding and the magnetic core without any cooling measures, which are respectively denoted as T w0 and T m0 ;

[0045] S3, a model of the magnetic device cooling structure is established in COMSOL Multiphysics, wherein the thickness of each phase change material and the corresponding encapsulation shell is modeled by parameterization, the thickness variable d of the phase change material is changed from a to b with a step of c, and the thickness of the encapsulation shell is changed from a to b with a step of c pcm control;

[0046] S4, a parameterized scan in the steady-state study of COMSOL Multiphysics is performed, the thickness variable d of the phase change material is changed from a to b with a step of c pcm , and the range of the value is set as range (a, c, b), wherein a and b are the upper and lower limits of the value range, and c is the variable step, so there are (b-a) / c+1 different values of d pcm , and the magnetic device cooling structures of different sizes are generated by different values of d pcm ;

[0047] S5, the parameterized scan in the steady state is performed, and the domain probe is used to obtain two groups of (b-a) / c+1 average temperatures of the windings and the magnetic core, which are denoted as T w1 ,T w2 ,…,T w((b-a) / c+1) and T m1 ,T m2 ,…,T m((b-a) / c+1) ;

[0048] S6, the initial temperatures T w0 and T m0 of the windings and the magnetic core are respectively subtracted by the average temperatures of the windings and the magnetic core, to obtain two groups of temperature reduction amounts T w0 -T w1 ,T w0 -T w2 ,…,T w0 -T w((b-a) / c+1) and T m0 -T m1 ,T m0 -T m2 ,…,T m0 -T m((b-a) / c+1) , which represent the cooling effects of the magnetic device cooling structures formed by different thickness variables d pcm of the phase change material on the windings and the magnetic core;

[0049] S7, for different thickness variables d pcm of the phase change material, the total volume V1, V2, …, V ((b-a) / c+1) and the total mass m1, m2, …, m ((b-a) / c+1) of the corresponding magnetic device cooling structure are calculated;

[0050] S8, the temperature reduction amount T w0 -Tw1 T w0 -T w2 ,…,T w0 -T w((b-a) / c+1) and the total volume of the cooling structure corresponding to them V1, V2, …, V ((b-a) / c+1) , respectively, we get (T w0 -T w1 ) / V1, (T w0 -T w2 ) / V2, …, (T w0 -T w((b-a) / c+1) ) / V ((b-a) / c+1) This set of data represents the winding cooling capacity brought by unit volume of cooling structure, and the physical meaning is the cooling structure volume required to reduce the winding temperature by 1℃;

[0051] S9, similarly, the temperature reduction amount T m0 -T m1 ,T m0 -T m2 ,…,T m0 -T m((b-a) / c+1) and the total volume of the cooling structure corresponding to them V1, V2, …, V ((b-a) / c+1) , respectively, we get (T m0 -T m1 ) / V1, (T m0 -T m2 ) / V2, …, (T m0 -T m((b-a) / c+1) ) / V ((b-a) / c+1) This set of data represents the winding cooling capacity brought by unit volume of cooling structure, and the physical meaning is the cooling structure volume required to reduce the winding temperature by 1℃;

[0052] S10, define the winding and core cooling capacity brought by unit volume of cooling structure in S8 and S9 as unit volume effective cooling capacity;

[0053] S11, the temperature reduction amount T w0 -T w1 ,T w0 -T w2 ,…,T w0 -T w((b-a) / c+1) and the total mass of the cooling structure corresponding to them m1, m2, …, m ((b-a) / c+1) , respectively, we get (T w0 -T w1 ) / m1, (T w0 -T w2 ) / m2, …, (T w0 -T w((b-a) / c+1) ) / m ((b-a) / c+1)This set of data represents the cooling capacity of the winding per unit mass of cooling structure, which physically means the mass of cooling structure required to reduce the winding temperature by 1°C.

[0054] S12. Similarly, reduce the temperature of the magnetic core by T. m0 -T m1 ,T m0 -T m2 ,…,T m0 -T m((b-a) / c+1) The total mass m1, m2, ..., m of the corresponding magnetic device cooling structure ((b-a) / c+1) Divide them to get (T) m0 -T m1 ) / m1,(T m0 -T m2 ) / m2,…,(T m0 -T m((b-a) / c+1) ) / m ((b-a) / c+1) This set of data represents the cooling capacity of the magnetic core per unit mass of cooling structure, which physically means the mass of cooling structure required to reduce the temperature of the magnetic core by 1°C.

[0055] S13. The cooling capacity of the windings and cores brought about by the unit mass cooling structure in S11 and S12 is defined as the effective cooling capacity per unit mass.

[0056] S14. Material costs and transportation costs are most affected by mass, depending on the total mass m1, m2, ..., m ((b-a) / c+1) The calculation of the cooling structure for the magnetic device yielded a set of material costs, denoted as C. c1 C c2 ,…,C c((b-a) / c+1) Then, based on different total masses m1, m2, ..., m ((b-a) / c+1) The calculation of the cooling structure for the magnetic device yielded a set of transportation costs, denoted as C. t1 C t2 ,…,C t((b-a) / c+1) Adding the material cost and transportation cost together, we get C. c1 +C t1 C c2 +C t2 ,…,C c((b-a) / c+1) +C t((b-a) / c+1) This set of data represents the total cost;

[0057] S15. Total cost C c1 +C t1 C c2 +C t2 ,…,C c((b-a) / c+1) +C t((b-a) / c+1) The corresponding temperature reduction T of the winding w0 -T w1 ,Tw0 -T w2 ,…,T w0 -T w((b-a) / c+1) Divide the total cost C c1 +C t1 ) / (T w0 -T w1 ), (C c2 +C t2 ) / (T w0 -T w2 ), …, (C c((b-a) / c+1) +C t((b-a) / c+1) ) / (T w0 -T w((b-a) / c+1) ) by the corresponding temperature reduction T c1 -T t1 ,T c2 -T t2 ,…,T c((b-a) / c+1) -T t((b-a) / c+1) of the magnetic core, and the result is a set of data representing the total cost needed to reduce the winding temperature by 1℃;

[0058] S16、Similarly, divide the total cost C c1 +C t1 ,C c2 +C t2 ,…,C c((b-a) / c+1) +C t((b-a) / c+1) by the corresponding temperature reduction T m0 -T m1 ,T m0 -T m2 ,…,T m0 -T m((b-a) / c+1) of the magnetic core, and the result is a set of data representing the total cost needed to reduce the winding temperature by 1℃; c1 +C t1 ) / (T m0 -T m1 ),(C c2 +C t2 ) / (T m0 -T m2 ),…,(C c((b-a) / c+1) +C t((b-a) / c+1) ) / (T m0 -T m((b-a) / c+1) ), which represents the total cost needed to reduce the magnetic core temperature by 1℃;

[0059] S17、Define the total cost needed to reduce the winding and magnetic core temperature by 1℃ in S15 and S16 as the unit cooling cost;

[0060] S18、Fit the four sets of data obtained in S8 and S9 and S15 and S16 into four smooth curves by Origin and plot them in the same image, with the horizontal axis coordinate being the thickness variable d pcm of the phase change material, and the left and right vertical axis coordinates being the unit volume effective cooling capacity defined in S10 and the unit cooling cost defined in S17, respectively;

[0061] S19, four smooth curves exist four intersection points in the image obtained from S18, the average horizontal coordinate of the four intersection points is obtained by the method of averaging, denoted as x v , the value of x v is the corresponding optimal thickness value of the phase change material when considering the volume, material cost and transportation cost of the magnetic device cooling structure;

[0062] S20, similarly, four sets of data obtained from S11 and S12 and S15 and S16 are fitted into four smooth curves by Origin and plotted in the same image, the horizontal coordinate is the thickness variable d pcm of the phase change material, and the left and right vertical coordinates are the unit mass effective cooling capacity defined by S13 and the unit cooling cost defined by S17;

[0063] S21, four smooth curves exist four intersection points in the image obtained from S20, the average horizontal coordinate of the four intersection points is obtained by the method of averaging, denoted as x m , the value of x m is the corresponding optimal thickness value of the phase change material when considering the mass, material cost and transportation cost of the magnetic device cooling structure

[0064] S22, the average value of x v and x m is denoted as x c , and the value of x c is the optimal thickness value of the phase change material when considering the volume, mass, material cost and transportation cost of the magnetic device cooling structure;

[0065] S23, x c obtained based on this method guides the design of the magnetic device cooling structure, and the optimal cooling structure size under the multi-objective requirements including volume, mass, material cost and transportation cost can be obtained.

[0066] Embodiment

[0067] This embodiment is aimed at the magnetic device of the space power supply. The magnetic device 1 generates heat as the work starts. The part of the magnetic device 1 exposed to the environment releases heat in the form of radiation and weak convection. The rest of the heat is transmitted to the aluminum support plate 2 and each phase change material and each packaging shell in the form of heat conduction.

[0068] The aluminum support plate 2 releases the heat conducted from the magnetic device 1 to the environment in the form of radiation and weak convection. The heat is transmitted to each packaging shell in direct contact with the magnetic device 1 in the form of heat conduction, and is finally also released to the environment in the form of radiation and weak convection.

[0069] Most of the heat is transferred to each phase change material in the form of heat conduction, the high latent heat of the phase change materials makes the heat be absorbed and transferred away from the magnetic device 1 rapidly, and finally be released to the environment in the form of radiation and weak convection through each packaging shell.

[0070] Based on the proposed magnetic device cooling structure, in a specific implementation, the temperature of a space power magnetic device in a space cabin environment (assuming a temperature of 20 degrees Celsius and weak natural convection) is simulated based on the COMSOL Multiphysics platform, combined with Figure 4 shown; at the same time, the temperature distribution of the magnetic device 1 when the method of the present application is implemented is simulated under the same physical parameters and environmental conditions, combined with Figure 5 shown, in which all the phase change materials and the corresponding packaging shells have been hidden to facilitate observation of the temperature distribution of the magnetic device 1.

[0071] Comparison Figure 4 and Figure 5 It can be observed that after adopting the method of the present application, the overall temperature distribution of the magnetic device 1 is significantly reduced. After specific calculation, the average temperature of the winding of the magnetic device 1 without adding any structure is 67.166℃, and the average temperature of the magnetic core is 61.627℃; while after adopting the structure design mentioned in the present application, the average temperature of the winding of the magnetic device 1 is 52.663℃, and the average temperature of the magnetic core is 51.477℃. The average temperature of the winding and the magnetic core is reduced by 14.503℃ and 10.150℃, about 21.59% and 19.72%, respectively, which can prove that the structure proposed in the present application is effective for cooling the magnetic device 1.

[0072] After verifying the effectiveness and feasibility of the structure proposed in the present application, based on the multi-objective optimization method proposed in the present application, in a specific implementation, the two images mentioned in S18 and S20 are drawn, combined with Figure 6 and Figure 7 shown. Figure 6 For the relationship between the effective cooling capacity per unit volume and the unit cooling cost, the intersection points of the four curves in the figure (from left to right) are 0.01647, 0.01862, 0.01866, and 0.02074, and the average value x v =0.01862; Figure 7 For the relationship between the effective cooling capacity per unit mass and the unit cooling cost, the intersection points of the four curves in the figure (from left to right) are 0.01634, 0.01836, 0.01836, and 0.02019, and the average value x m =0.01831; the average value of x v and x m is obtained, which is x c=0.01847, which is the thickness value of the optimal phase change material in this embodiment, i.e. 18.47 mm. Based on the thickness value, the overall design of the cooling structure can comprehensively meet the multi-objective requirements of volume, mass, material cost and transportation cost.

[0073] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other embodiments without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent conditions of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0074] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A multi-objective optimization method for cooling a magnetic device structure of a space power supply based on a phase change material, characterized in that: The method comprises the following steps: S1, the bottom of the magnetic device is supported and positioned by an aluminum support plate, a magnetic device cooling structure is designed, and a phase change material is sealed and wrapped by an encapsulation shell on the surface of the magnetic core of the magnetic device, and the phase change material is in contact with the surface of the magnetic core of the magnetic device; S2, the model of the magnetic device and the aluminum support plate is established in COMSOL Multiphysics, the actual heating power, material parameters and boundary conditions of the winding and the magnetic core in the magnetic device are given completely, and the initial temperature T of the winding and the magnetic core is obtained by using a domain probe w0 and T m0 ; S3, in COMSOL Multiphysics, the model of the magnetic device cooling structure is established, the thickness of the phase change material and the packaging shell adopts parameterized modeling, the thickness variable d of the phase change material pcm control; S4, set thickness variable d pcm The assignment range range(a, c, b) of a and b is the upper and lower limit respectively, and c is the variable step, so there are (b-a) / c+1 different d pcm Values, corresponding to different sizes of magnetic device cooling structure; S5, performing a steady-state parameterization scan, using a domain probe to obtain different d pcm The average temperature T of the winding and the magnetic core corresponding to the value w1 ,T w2 ,…,T w((b-a) / c+1) and T m1 ,T m2 ,…,T m((b-a) / c+1) ; S6, calculate the temperature reduction of the winding and the magnetic core, respectively, T w0 -T w1 ,T w0 -T w2 ,…,T w0 -T w((b-a) / c+1) and T m0 -T m1 ,T m0 -T m2 ,…,T m0 -T m((b-a) / c+1) ; S7, calculating the different thickness variables d pcm corresponding to the total volume V1, V2,..., V ((b-a) / c+1) and the total mass m1, m2,..., m ((b-a) / c+1) ; S8, calculate the effective cooling capacity of the winding and the magnetic core per unit volume, respectively, (T w0 -T wi ) / V i and (T m0 -T mi ) / V i , i=1, 2, …, (b-a) / c+1; S9, calculate the effective cooling capacity of the winding and the magnetic core per unit mass, respectively, (T w0 -T wi ) / m i and (T m0 -T mi ) / m i , i=1, 2, …, (b-a) / c+1; S10, calculate material cost C c1 c2 c((b-a) / c+1) and transportation cost C t1 t2 t((b-a) / c+1) , get total cost C c1 t1 c2 t2 c((b-a) / c+1) t((b-a) / c+1) ;​​​​​​​​​ S11, calculate the unit cooling cost of the winding and the magnetic core, respectively, (C ci +C ti ) / (T w0 -T wi ) and (C ci +C ti ) / (T m0 -T mi ), i=1, 2, …, (b-a) / c+1; S12, fitting the four sets of data of unit volume effective cooling capacity and unit cooling cost into curves by Origin, and finding the average horizontal coordinate x of the intersection points of the four curves v ; S13, fitting the four groups of data of unit mass effective cooling capacity and unit cooling cost into curves by Origin, and finding the average horizontal coordinate x of the intersection points of the four curves m ; S14, find x v and x m the average value x c i.e. the thickness value of the best phase change material, with which the design of the magnetic device cooling structure is guided.

2. The multi-objective optimization method for cooling magnetic devices of a space power supply based on a phase change material according to claim 1, characterized in that: The magnetic device cooling structure comprises an upper encapsulation shell, a right encapsulation shell, a front encapsulation shell, a rear encapsulation shell, a left encapsulation shell and a phase change material; the front encapsulation shell is in the shape of a mouth and is abutted against the front side surface of the magnetic core of the magnetic device, the rear encapsulation shell is in the shape of n and is abutted against the rear side surface of the magnetic core of the magnetic device, the left encapsulation shell and the right encapsulation shell are symmetrically clamped on the left and right sides of the magnetic core of the magnetic device, the upper encapsulation shell is capped on the top of the magnetic core of the magnetic device, the phase change material is filled in each encapsulation shell, and the joints of the encapsulation shells are sealed.

3. The multi-objective optimization method for cooling magnetic devices of a space power supply based on phase change material according to claim 2, characterized in that: The middle hollowed-out areas of the front encapsulation shell and the rear encapsulation shell expose the winding of the magnetic device to the environment, and the bottom of the rear encapsulation shell is open for avoiding the wiring part of the magnetic device.

4. The multi-objective optimization method for cooling magnetic devices of a space power supply based on phase change material according to claim 2, characterized in that: The encapsulation shells are made of aluminum alloy material, and the shell thicknesses of the encapsulation shells are the same.

5. The multi-objective optimization method for cooling magnetic devices of a space power supply based on phase change material according to claim 1, characterized in that: In the step S12, four curves are plotted with the horizontal axis as the thickness variable d of the phase change material pcm , and the left and right vertical axes as the effective cooling capacity per unit volume and the unit cooling cost, respectively. In the step S13, four curves are plotted with the horizontal axis as the thickness variable d of the phase change material pcm , and the left and right vertical axes as the effective cooling capacity per unit mass and the unit cooling cost, respectively.

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