A method for detecting core loss of soft magnetic materials

Abstract

The present invention provides a method for detecting core loss of soft magnetic materials, which belongs to the technical field of core loss. The method comprises the following steps: S1: calculating the length and cross-sectional area of the core; S2: installing a first coil and a second coil on the core, wherein the first coil excites the core and the second coil detects a magnetic induction voltage; S3: connecting the first coil to a DC power supply, adjusting the output current value of the DC power supply, and calculating the average value of the output current value and the magnetic induction voltage value; S4: connecting the first coil to an AC power supply, adjusting the output current value of the AC power supply, and calculating the average value of the output current value and the magnetic induction voltage value; and S5: inputting the average values of the output current value and the magnetic induction voltage value in S3 and S4 into a loss meter to calculate the loss degree W. DC 、W AC S6: Adjust the circumferential position and axial position of the first coil and the second coil. The method for detecting core loss of soft magnetic materials provided by the present invention improves the accuracy of core loss detection.

Description

Technical Field

[0001] The present invention belongs to the technical field of core loss, and more specifically, relates to a method for detecting core loss of soft magnetic materials. Background Art

[0002] In electronic equipment, some passive components such as resistors and capacitors have been planarized, which can significantly reduce mass and volume. However, for power devices such as inductors and transformers, especially under high-power conditions, it is difficult to achieve planarization technology due to process technology limitations. This requires starting from the perspective of device materials and utilizing the high performance characteristics of new materials to reduce the volume and mass of devices, such as developing soft magnetic materials with comprehensive performance such as high saturation magnetic induction intensity, high magnetic permeability, and low high-frequency loss.

[0003] However, soft magnetic materials suffer from high-frequency losses, and their processing is still immature. Problems such as significantly increased losses after cutting and increased stress loss after casting remain unresolved. Furthermore, excessive core loss in soft magnetic materials often causes localized overheating during the operation of electrical equipment, significantly impacting its efficiency and stability and reducing the operating quality of related equipment. Therefore, accurately calculating core loss over a wide frequency range is essential for optimizing the design of electrical equipment.

[0004] Currently, core loss is mostly calculated using an iron loss separation model based on the Steinmetz formula. However, under this detection method, the calculation range of core loss is small, resulting in low accuracy of the core loss calculation results. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for detecting core loss of soft magnetic materials, so as to solve the technical problem of low accuracy of core loss calculation results existing in the prior art.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a method for detecting core loss of soft magnetic materials, including S1: calculating the length and cross-sectional area of the core; S2: installing a first coil and a second coil on the core, the first coil excites the core, and the second coil detects the magnetic induction voltage generated by the first coil; S3: connecting the first coil to a DC power supply and continuously adjusting the output current value of the DC power supply, the output current value changes linearly and gradually increases, and recording the output current value and the magnetic induction voltage value, and calculating the average value of the output current value and the magnetic induction voltage value; S4: connecting the first coil to an AC power supply and continuously adjusting the output current value of the AC power supply, the output current value changes linearly and gradually increases; and recording the output current value and the magnetic induction voltage value, and calculating the average value of the output current value and the magnetic induction voltage value; S5: inputting the average values of the output current value and the magnetic induction voltage value in S3 and S4 into a loss meter respectively to calculate the loss degree W DC 、W AC , S6: Adjust the circumferential position and axial position of the first coil and the second coil, and repeat S3 to S5.

[0007] In a possible implementation, in S3, the first coil and the DC power supply are connected in a forward direction and a reverse direction. When connected in the forward direction, the output current value and the magnetic induction voltage value are recorded. When connected in the negative direction, the output current value and the magnetic induction voltage value are recorded. The data obtained by the forward connection and the reverse connection are respectively input into the loss meter to calculate W. DC Including +W DC and -W DC ; If |+W DC ∣>∣-W DC ∣, then discard -W DC ; If |+W DC ∣≤∣-W DC ∣, then discard +W DC .

[0008] In one possible implementation, in S3, when the first coil and the DC power supply are connected in a forward direction, the output current value increases to a maximum value and is maintained for an operation time T, and the maximum value of the magnetic induction voltage value of the second coil is recorded; when the first coil and the DC power supply are connected in a reverse direction, the output current value increases to a maximum value and is maintained for an operation time T, and the maximum value of the magnetic induction voltage value of the second coil is recorded.

[0009] In one possible implementation, in S4, the output current value of the AC power supply is kept unchanged, the frequency of the output current is adjusted, the frequency of the output current and the corresponding magnetic induction voltage value are recorded, and the average value of the frequency and the magnetic induction voltage value is calculated; and in S5, the average value of the frequency and the magnetic induction voltage value is input into the loss meter to calculate the loss W. ACf .

[0010] In one possible implementation, in S3, after the output current value changes linearly and gradually increases, the output current value is controlled to change linearly and gradually decrease, and each output current value and the corresponding magnetic induction voltage value are recorded; the output current value recorded during the gradual increase in the output current value corresponds to and is equal to the output current value recorded during the gradual decrease in the output current value.

[0011] In a possible implementation, when calculating the average value, data with errors in the output current value and the magnetic induction voltage value are removed.

[0012] In one possible implementation, in S6, when adjusting the axial position of the first coil and the second coil, the movement distance of the first coil and the second coil is less than or equal to half of the height of the first coil or the second coil; when adjusting the circumferential position of the first coil and the second coil, the movement arc of the first coil and the second coil is less than or equal to half of the arc corresponding to the width of the first coil or the second coil on the iron core.

[0013] In one possible implementation, a cooling chamber is provided in S2, the iron core is installed in the cooling chamber, a support is provided at the bottom of the cooling chamber, and a clamping mechanism is provided at the top. The lower end of the iron core is supported on the support, and the clamping mechanism is used to clamp the iron core from top to bottom.

[0014] In one possible implementation, two end cooling fans and multiple circumferential cooling fans are provided in the cooling cavity, the two end cooling fans are respectively fixed at the top and bottom of the cooling cavity, and the multiple circumferential cooling fans are evenly distributed on the inner wall of the cooling cavity, and the center line of the air outlet of the circumferential cooling fan is tangent to the outer surface of the iron core.

[0015] In one possible implementation, the support has four supporting protrusions arranged in a rectangular array, and the iron core is supported on the four supporting protrusions; the end cooling fan located below is installed between the multiple supporting protrusions; the clamping mechanism has four extrusion ends arranged in a rectangular array, and the end cooling fan located above is installed between the multiple extrusion ends; the outlet width of the multiple circumferential cooling fans is greater than or equal to the length of the iron core.

[0016] The beneficial effects of the soft magnetic material core loss detection method provided by the present invention are as follows: compared with the prior art, the soft magnetic material core loss detection method of the present invention installs a first coil and a second coil on the iron core, and adopts two currents: direct current and alternating current to act on the first coil in sequence, and the magnetic induction voltage generated under the first coil is detected by the second coil; when a direct current power supply is used to connect to the first coil, the magnitude of the direct current is set to increase linearly and gradually, the output current value and the corresponding magnetic induction voltage value are recorded, and the average value of the output current value and the magnetic induction voltage value is calculated; when an alternating current power supply is used to connect to the first coil, the effective value of the alternating current is set to increase linearly and gradually, and the output current value and the corresponding magnetic induction voltage value are also recorded. voltage value, and calculate the average value of the output current value and the magnetic induction voltage value; then the obtained average values of the output current value and the magnetic induction voltage value are respectively input into the loss meter to obtain two loss degrees, and then the circumferential position and axial position of the first coil and the second coil on the iron core are adjusted, and the DC power supply and the AC power supply are repeatedly connected to the first coil, and the core loss detection is repeated; in this way, by connecting the DC current and the AC current to the first coil respectively, and using multiple groups of output current values to measure multiple groups of magnetic induction voltage values, at the same time, by adjusting the changes in the circumferential position and axial position of the first coil and the second coil, the core loss is repeatedly detected, thereby eliminating the influence of interference factors and improving the accuracy of core loss detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of the structure inside the cooling chamber provided by an embodiment of the present invention.

[0019] Among them, the reference numerals in the figures are:

[0020] 100, cooling chamber; 200, end cooling fan; 300, circumferential cooling fan; 400, supporting protrusion; 500, pressing mechanism; 600, extrusion end. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0023] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0025] The method for detecting core loss of soft magnetic materials provided by the present invention is now described. A method for detecting core loss of soft magnetic materials includes S1: calculating the length and cross-sectional area of the core; S2: installing a first coil and a second coil on the core, the first coil excites the core, and the second coil detects the magnetic induction voltage generated by the first coil; S3: the first coil is connected to a DC power supply, and the output current value of the DC power supply is continuously adjusted, the output current value changes linearly and gradually increases, and the output current value and the magnetic induction voltage value are recorded, and the average value of the output current value and the magnetic induction voltage value are calculated; S4: the first coil is connected to an AC power supply, and the output current value of the AC power supply is continuously adjusted, the output current value changes linearly and gradually increases; and the output current value and the magnetic induction voltage value are recorded, and the average value of the output current value and the magnetic induction voltage value are calculated; S5: the average values of the output current value and the magnetic induction voltage value in S3 and S4 are respectively input into the loss meter to calculate the loss degree W DC 、W AC , S6: Adjust the circumferential position and axial position of the first coil and the second coil, and repeat S3 to S5.

[0026] The soft magnetic material core loss detection method provided by the present invention is compared with the prior art. A first coil and a second coil are installed on the iron core, and two currents: a direct current and an alternating current are successively applied to the first coil, and the magnetic induction voltage generated under the first coil is detected by the second coil; when a direct current power supply is connected to the first coil, the magnitude of the direct current is set to increase linearly and gradually, the output current value and the corresponding magnetic induction voltage value are recorded, and the average value of the output current value and the magnetic induction voltage value are calculated; when an alternating current power supply is connected to the first coil, the effective value of the alternating current is set to increase linearly and gradually, the output current value and the corresponding magnetic induction voltage value are also recorded, and the output current value and the magnetic induction voltage value are calculated. The average value of the output current value and the average value of the magnetic induction voltage value are input into the loss meter to obtain two loss degrees, and then the circumferential position and axial position of the first coil and the second coil on the iron core are adjusted, and the DC power supply and the AC power supply are connected to the first coil again, and the core loss detection is repeated; in this way, the DC current and the AC current are connected to the first coil respectively, and multiple groups of output current values are used to measure multiple groups of magnetic induction voltage values. At the same time, the core loss is repeatedly detected after the changes in the circumferential position and axial position of the first coil and the second coil are adjusted, thereby eliminating the influence of interference factors and improving the accuracy of core loss detection.

[0027] W of multiple test results DC 、W AC After comprehensive comparison, take the maximum value W DC or W AC The final test result.

[0028] As a specific embodiment of the soft magnetic material core loss detection method provided by the present invention, in S3, the first coil is connected to the DC power supply in a forward direction and a reverse direction. When connected in the forward direction, the output current value and the magnetic induction voltage value are recorded. When connected in the negative direction, the output current value and the magnetic induction voltage value are recorded. The data obtained by the forward connection and the reverse connection are respectively input into the loss meter to calculate W. DC Including +W DC and -W DC ; If |+W DC ∣>∣-W DC ∣, then discard -W DC ; If |+W DC ∣≤∣-W DC ∣, then discard +W DC .

[0029] The DC current output by the DC power supply is divided into positive current and negative current, which changes the direction of the magnetic domain in the hysteresis loss of the core. Therefore, the core can be detected in various states without missing any detection.

[0030] After the positive current and negative current act on the first coil, +W can be calculated DC and -W DC , then calculate +W DC and -W DC The absolute value of , takes the larger value as the core loss.

[0031] This method of connecting the positive current and the negative current to the first coil respectively can detect the core loss data under different rotation states of the magnetic domains in the core, making the core loss detection more accurate.

[0032] As a specific implementation method of the soft magnetic material core loss detection method provided by the present invention, in S3, when the first coil is connected to the DC power supply in a forward direction, the output current value increases to a maximum value and maintains the operation time T, and the maximum value of the magnetic induction voltage value of the second coil is recorded; when the first coil is connected to the DC power supply in a reverse direction, the output current value increases to a maximum value and maintains the operation time T, and the maximum value of the magnetic induction voltage value of the second coil is recorded.

[0033] When a positive current is connected to the first coil, the DC current is controlled to increase linearly to the maximum value, which is recorded as I MAX , keep the output current value at the maximum value for time T, and record the magnetic induction voltage value measured by the second coil in the stable state.

[0034] When a negative current is connected to the first coil, the DC current is controlled to increase linearly to the maximum value, which is recorded as I MAX , keep the output current value at the maximum value for time T, and record the magnetic induction voltage value measured by the second coil in the stable state.

[0035] In this way, the core loss in a strong working state can be recorded and maintained in this state for a period of time to ensure the accuracy of the test data.

[0036] As a specific embodiment of the soft magnetic material core loss detection method provided by the present invention, in S4, the output current value of the AC power supply is kept unchanged, the frequency of the output current is adjusted, the frequency of the output current and the corresponding magnetic induction voltage value are recorded, and the average value of the frequency and the magnetic induction voltage value is calculated; and in S5, the average value of the frequency and the magnetic induction voltage value is input into the loss meter to calculate the loss degree W. ACf .

[0037] After the first coil is connected to the AC power supply, the frequency of the output current is adjusted while keeping the output current value unchanged, and the magnetic induction voltage value is measured. The output current value, frequency and magnetic induction voltage value are input into the loss meter to detect the core loss.

[0038] In this way, the core loss is detected from the frequency point of view, which increases the range of core loss detection.

[0039] As a specific implementation method of the soft magnetic material core loss detection method provided by the present invention, in S3, after the output current value changes linearly and gradually increases, the output current value is controlled to change linearly and gradually decrease, and each output current value and the corresponding magnetic induction voltage value are recorded; the output current value recorded when the output current value gradually increases corresponds to the output current value recorded when it gradually decreases and is equal.

[0040] When a DC power supply is used to provide current to the first coil in S3, in order to improve the detection accuracy of the core loss, the output current needs to be adjusted to obtain more magnetic induction voltage values.

[0041] The output current increases linearly and gradually, and the output current takes an integer value. At the same time, the magnetic induction voltage value measured by the corresponding second coil is recorded.

[0042] After controlling the output current to increase linearly, the output current is then controlled to decrease linearly, and the output current takes an integer value. At the same time, the magnetic induction voltage value measured by the second coil during the process is recorded.

[0043] In this way, the output current value increases and decreases repeatedly, thereby monitoring the core loss in different states and improving the accuracy of core loss detection.

[0044] Preferably, the integer value taken by the output current during the process of linearly and gradually increasing the output current is different from the integer value taken by the output current during the process of linearly and gradually decreasing the output current, thereby increasing the range of core detection.

[0045] The value of the output current in the process of linearly and gradually increasing the output current is set to an even number, and the value of the output current in the process of linearly and gradually decreasing the output current is set to an odd number.

[0046] As a specific implementation of the method for detecting core loss of soft magnetic materials provided by the present invention, when calculating the average value, data with errors in the output current value and the magnetic induction voltage value are removed.

[0047] When detecting the loss of the iron core, interference factors such as temperature and vibration may exist, which may cause a large error in the magnetic induction voltage value measured by the second coil.

[0048] Therefore, the change in the output current value is repeated multiple times to screen out the magnetic induction voltage value that is obviously inconsistent with the requirements, thereby improving the accuracy of the detection of core loss.

[0049] As a specific implementation method of the soft magnetic material core loss detection method provided by the present invention, in S6, when adjusting the axial position of the first coil and the second coil, the moving distance of the first coil and the second coil is less than or equal to half of the height of the first coil or the second coil; when adjusting the circumferential position of the first coil and the second coil, the moving arc of the first coil and the second coil is less than or equal to half of the arc corresponding to the width of the first coil or the second coil on the iron core.

[0050] The first coil and the second coil are controlled to move axially along the core to fully cover the core to detect its loss. The distance the first coil moves each time is less than half of the height of the first coil, thereby realizing segmented detection of the core. At the same time, there is also overlapping detection of the core, which improves the completeness of the core loss detection and can also realize the comparison of overlapping positions.

[0051] When the first coil moves, the second coil is controlled to move accordingly, so that the second coil can accurately measure the magnetic induction voltage value.

[0052] The first coil and the second coil are controlled to move circumferentially of the core, and the core is fully covered to detect its loss. The arc of the circumferential movement of the first coil each time is less than half of the arc corresponding to the width of the first coil on the core, thereby realizing segmented detection of the core. At the same time, there is also overlapping detection of the core, which improves the completeness of the core loss detection and can also realize the comparison of overlapping positions.

[0053] When the first coil moves, the second coil is controlled to move accordingly, so that the second coil can accurately measure the magnetic induction voltage value.

[0054] See also Figure 1 As a specific implementation of the soft magnetic material core loss detection method provided by the present invention, a cooling chamber 100 is set in S2, and the iron core is installed in the cooling chamber 100. A support is provided at the bottom of the cooling chamber 100, and a clamping mechanism 500 is provided at the top. The lower end of the iron core is supported on the support and is clamped on the iron core from top to bottom using the clamping mechanism 500.

[0055] A cooling chamber 100 is provided so that the core, the first coil, and the second coil are all placed within the cooling chamber 100. During testing, the core, the first coil, and the second coil are kept at room temperature by means of the cooling function of the cooling chamber 100. This prevents the accuracy of the core loss test from being affected by a temperature rise of the core, the first coil, and the second coil.

[0056] A support is provided at the bottom of the cooling chamber 100 and a clamping mechanism 500 is provided at the top. When the core is installed in the cooling chamber 100, the lower end of the core is supported on the support, and the clamping mechanism 500 is used to press the core from top to bottom, thereby making the core more stable and having a tight structure, thereby ensuring the accuracy of the detection.

[0057] See also Figure 1 As a specific implementation of the soft magnetic material core loss detection method provided by the present invention, two end cooling fans 200 and multiple circumferential cooling fans 300 are provided in the cooling cavity 100. The two end cooling fans 200 are respectively fixed at the top and bottom of the cooling cavity 100, and the multiple circumferential cooling fans 300 are evenly distributed on the inner wall of the cooling cavity 100, and the center line of the air outlet of the circumferential cooling fan 300 is tangent to the outer surface of the core.

[0058] The two end cooling fans 200 are respectively installed at the top and bottom of the cooling chamber 100, so that the core can be cooled from top and bottom respectively.

[0059] Multiple circumferential cooling fans 300 are arranged around the core and mounted on the inner wall of the cooling chamber 100. The air outlets of the circumferential cooling fans 300 are oriented toward the core. To improve the cooling effect, the centerline of each outlet is tangent to the outer surface of the core, thereby cooling the core. In this way, part of the cooling air from the outlets acts on the core, while the remaining part forms a flowing air flow within the cooling chamber 100, creating a more uniform environment throughout the cooling chamber 100 and ensuring uniform cooling across the core.

[0060] See also Figure 1 As a specific implementation of the soft magnetic material core loss detection method provided by the present invention, the support has four supporting protrusions 400 arranged in a rectangular array, and the iron core is supported on the four supporting protrusions 400; the end cooling fan 200 located at the bottom is installed between the multiple supporting protrusions 400; the clamping mechanism 500 has four extrusion ends 600 arranged in a rectangular array, and the end cooling fan 200 located at the top is installed between the multiple extrusion ends 600; the outlet width of the multiple circumferential cooling fans 300 is greater than or equal to the length of the iron core.

[0061] The multiple support protrusions 400 arranged in a rectangular array support the iron core stably and reliably, and the end cooling fan 200 below is fixedly installed between the multiple support protrusions 400, so that the end cooling fan 200 can cool the iron core more efficiently and improve the cooling effect.

[0062] Similarly, multiple extrusion ends 600 are provided on the clamping mechanism 500, and the multiple extrusion ends 600 are arranged in a rectangular array. After the clamping mechanism 500 is started, the multiple extrusion ends 600 are controlled to move downward and squeeze on the iron core, so that the iron core is fixed more tightly and firmly, and the upper end cooling fan 200 is fixedly installed between the multiple extrusion ends 600, so that the end cooling fan 200 can cool the iron core more efficiently, and the cooling effect is also improved.

[0063] At the same time, the width of the air outlet of the circumferential cooling fan 300 is set to be greater than or equal to the length of the iron core, so that the circumferential cooling fan 300 can cool the iron core in all directions.

[0064] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for detecting core loss of soft magnetic materials, characterized in that: Including S1: Calculate the length and cross-sectional area of the core; S2: Install the first coil and the second coil on the iron core, the first coil excites the iron core, and the second coil detects the magnetic induction voltage generated by the first coil; S3: Connect the first coil to a DC power supply and continuously adjust the output current value of the DC power supply. The output current value changes linearly and gradually increases. Record the output current value and the magnetic induction voltage value, and calculate the average value of the output current value and the average value of the magnetic induction voltage value; S4: Connect the first coil to an AC power supply and continuously adjust the output current value of the AC power supply. The output current value changes linearly and gradually increases. Record the output current value and the magnetic induction voltage value, and calculate the average value of the output current value and the average value of the magnetic induction voltage value; S5: Input the average value of the output current value and the average value of the magnetic induction voltage value in S3 and S4 into the loss meter to calculate the loss W DC 、W AC , S6: Adjust the circumferential position and axial position of the first coil and the second coil, and repeat S3 to S5.

2. The method for detecting core loss of soft magnetic materials according to claim 1, wherein: In S3, the first coil and the DC power supply are connected in a forward direction and a reverse direction. When connected in a forward direction, the output current value and the magnetic induction voltage value are recorded. When connected in a negative direction, the output current value and the magnetic induction voltage value are recorded. The data obtained by the forward connection and the reverse connection are input into the loss meter respectively to calculate W. DC Including +W DC and -W DC ; If |+W DC ∣>∣-W DC ∣, then discard -W DC ; If |+W DC ∣≤∣-W DC ∣, then discard +W DC .

3. The method for detecting core loss of soft magnetic materials according to claim 2, wherein: In S3, when the first coil and the DC power supply are connected in a forward direction, the output current value increases to a maximum value and is maintained for an operation time T, and the maximum value of the magnetic induction voltage value of the second coil is recorded; when the first coil and the DC power supply are connected in a reverse direction, the output current value increases to a maximum value and is maintained for an operation time T, and the maximum value of the magnetic induction voltage value of the second coil is recorded.

4. The method for detecting core loss of soft magnetic materials according to claim 1, wherein: In S4, the output current value of the AC power supply is kept unchanged, the frequency of the output current is adjusted, the frequency of the output current and the corresponding magnetic induction voltage value are recorded, and the average value of the frequency and the average value of the magnetic induction voltage value are calculated; and in S5, the average value of the frequency and the average value of the magnetic induction voltage value are respectively input into the loss meter to calculate the loss W ACf .

5. The method for detecting core loss of soft magnetic materials according to claim 1, wherein: In S3, after the output current value changes linearly and gradually increases, the output current value is controlled to change linearly and gradually decrease, and each output current value and the corresponding magnetic induction voltage value are recorded; the output current value recorded during the gradual increase of the output current value corresponds to the output current value recorded during the gradual decrease and is equal.

6. The method for detecting core loss of soft magnetic materials according to claim 5, wherein: When calculating the average value, data with errors in the output current value and the magnetic induction voltage value are removed.

7. The method for detecting core loss of soft magnetic materials according to claim 1, wherein: In S6, when adjusting the axial position of the first coil and the second coil, the movement distance of the first coil and the second coil is less than or equal to half of the height of the first coil or the second coil; when adjusting the circumferential position of the first coil and the second coil, the movement arc of the first coil and the second coil is less than or equal to half of the arc corresponding to the width of the first coil or the second coil on the iron core.

8. The method for detecting core loss of soft magnetic materials according to claim 1, wherein: A cooling cavity is provided in S2, the iron core is installed in the cooling cavity, a support is provided at the bottom of the cooling cavity, a clamping mechanism is provided at the top, the lower end of the iron core is supported on the support, and the clamping mechanism is used to clamp the iron core from top to bottom.

9. The method for detecting core loss of soft magnetic materials according to claim 8, wherein: Two end cooling fans and multiple circumferential cooling fans are provided in the cooling cavity. The two end cooling fans are respectively fixed on the top and bottom of the cooling cavity. The multiple circumferential cooling fans are evenly distributed on the inner wall of the cooling cavity, and the center lines of the air outlets of the circumferential cooling fans are tangent to the outer surface of the iron core.

10. The method for detecting core loss of soft magnetic material according to claim 9, wherein: The support has four supporting protrusions arranged in a rectangular array, and the core is supported on the four supporting protrusions; The end cooling fan located at the bottom is installed between the plurality of support protrusions; The clamping mechanism has four extrusion ends arranged in a rectangular array, and the end cooling fan located above is installed between the multiple extrusion ends; the outlet width of the multiple circumferential cooling fans is greater than or equal to the length of the iron core.

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