CN117930091A - Magnetic characteristic measuring device based on magnetic ring self-heating - Google Patents
Magnetic characteristic measuring device based on magnetic ring self-heating Download PDFInfo
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Abstract
The application provides a magnetic characteristic measuring device based on magnetic ring self-heating, which is additionally arranged on a magnetic ring and is used for respectively carrying out self-heating, demagnetization and magnetic characteristic measurement on the magnetic ring. The measuring device applies high-frequency low-flux alternating current excitation to the magnetic ring, and eddy current loss self-heating temperature rise is generated by the magnetic ring; when the thermal resistance sensor detects that the temperature of the magnetic ring exceeds a certain temperature, the temperature controller controls the contactor to disconnect the high-frequency excitation circuit, and the low-frequency demagnetization circuit is conducted to demagnetize the magnetic ring; when the temperature of the magnetic ring is reduced to the test temperature, the low-frequency demagnetization circuit is turned off, and the magnetic characteristic measurement is carried out on the magnetic ring at the given temperature by combining with the annular sample test method. The application can accurately control the heating time of the magnetic ring, measure the magnetic characteristic at the appointed working temperature of the magnetic ring, and improve the accuracy of magnetic characteristic measurement.
Description
Technical Field
The application relates to the technical field of magnetic property measurement of soft magnetic materials, in particular to a magnetic property measurement device based on magnetic ring self-heating.
Background
The soft magnetic materials represented by silicon steel, ferrite, amorphous and nanocrystalline are widely applied to transformers and motor cores, and the accurate test of the magnetic characteristics of the soft magnetic materials has important significance for the overall optimization of transformers and motors and the design of peripheral insulating devices and heat dissipation devices.
At present, researchers at home and abroad put forward various classical measurement methods including a ring sample test method, a single-chip test method, an Epstein method and the like aiming at the two-dimensional magnetic characteristics of the soft magnetic materials, and considering that the iron core soft magnetic materials such as transformers, motors and the like can reach a certain working temperature during actual operation, the traditional method is based on measurement in a laboratory normal-temperature environment, so that the measurement of the magnetic characteristics of the soft magnetic materials at different temperatures becomes a current research hot spot.
At present, a ring sample test method is adopted for testing magnetic characteristics of soft magnetic materials at different temperatures in combination with an incubator, and a magnetic ring is placed in the incubator to be heated to a test temperature, and a lead is led out for measurement. However, the magnetic ring is heated by the constant temperature box, firstly, the heating time cannot be estimated accurately, if the heating time is too short, the problem of unbalanced surface temperature and internal temperature of the magnetic ring exists, and if the heating time is too long, the winding wire of the magnetic ring is easy to age; secondly, the magnetic properties need to be measured at a specific operating temperature, whereas the oven changes the ambient temperature of the magnetic ring and not the operating temperature. The above problems may reduce the accuracy of the magnetic characteristic measurement.
Disclosure of Invention
In view of the above, an object of the embodiments of the present application is to provide a magnetic characteristic measurement device based on self-heating of a magnetic ring, which can precisely control heating time of the magnetic ring, measure magnetic characteristics at a specified operating temperature of the magnetic ring, and improve accuracy of magnetic characteristic measurement.
The embodiment of the application provides a magnetic characteristic measuring device based on magnetic ring self-heating, which is characterized in that the measuring device is additionally arranged on a magnetic ring and is used for respectively carrying out self-heating, demagnetization and magnetic characteristic measurement on the magnetic ring, and comprises a high-frequency excitation circuit, a low-frequency demagnetization circuit and a magnetic characteristic measuring circuit;
The high-frequency excitation circuit includes: the device comprises an adjustable direct current power supply A1, a high-frequency inverter circuit, a contactor A1, a temperature controller A1, a thermal resistance sensor A1 and a winding A; the contactor A1 is used for switching on and off the high-frequency inverter circuit, and the contactor A1 is normally closed and conducts the high-frequency inverter circuit; the high-frequency inverter circuit is connected with the adjustable direct current power supply A1 and is used for generating high-frequency low-magnetic density alternating current excitation; the winding A surrounds the magnetic ring and is connected with the high-frequency inverter circuit, and is used for applying the high-frequency low-density alternating current excitation to the magnetic ring so as to enable the magnetic ring to generate eddy current loss and self-heat; the thermal resistance sensor A1 is arranged on the magnetic ring and connected with the temperature controller A1, and is used for collecting the first magnetic ring temperature of the magnetic ring and sending the first magnetic ring temperature to the temperature controller A1; if the temperature of the first magnetic ring is greater than a preset temperature threshold, the temperature controller A1 controls the contactor A1 to be normally open, and the high-frequency inverter circuit is disconnected; the preset temperature threshold is greater than the test temperature of the magnetic ring;
The low frequency demagnetization circuit includes: the device comprises an adjustable direct current power supply A2, a low-frequency inverter circuit, a contactor A2, a temperature controller A2, a thermal resistance sensor A2 and a winding A, wherein the winding A is connected with the temperature controller A; the contactor A2 is used for switching on and off the low-frequency inverter circuit, and the contactor A2 is normally closed to conduct the low-frequency inverter circuit; the low-frequency inverter circuit is connected with the adjustable direct current power supply A2 and is used for generating a low-frequency alternating current square wave; the winding A surrounds the magnetic ring and is connected with the low-frequency inverter circuit, and is used for demagnetizing the magnetic ring under the action of the low-frequency alternating-current square wave; the thermal resistance sensor A2 is arranged on the magnetic ring and connected with the temperature controller A2, and is used for collecting the temperature of a second magnetic ring of the magnetic ring and sending the temperature of the second magnetic ring to the temperature controller A2; if the temperature of the second magnetic ring is equal to the test temperature, the temperature controller A2 controls the contactor A2 to be normally open, the low-frequency inverter circuit is disconnected, and the magnetic characteristic measuring circuit is conducted;
The magnetic characteristic measuring circuit comprises a signal generator, a power amplifier, a precision resistor, a digital sampler, a winding B and a winding C; wherein the signal generator is connected with the power amplifier; the winding B surrounds the magnetic ring and is connected with the power amplifier after being connected with the precise resistor in series; the digital sampler is connected with the precision resistor in parallel; the winding C surrounds the magnetic ring and is connected with the digital sampler.
In one possible embodiment, the winding a, the winding B, and the winding C are wound around the magnetic ring in parallel.
In one possible embodiment, a thermal insulation material is wrapped around the magnetic ring, and the winding a, the winding B, and the winding C.
In one possible implementation manner, the thermal resistance sensor A1 is respectively installed at a first inner diameter position point and a first outer diameter position point of the magnetic ring, and a connecting line of the first inner diameter position point and the first outer diameter position point passes through the circle center of the magnetic ring; and the thermal resistance sensor A2 is respectively arranged at a second inner diameter position point and a second outer diameter position point of the magnetic ring, and a connecting line of the second inner diameter position point and the second outer diameter position point passes through the circle center of the magnetic ring.
In one possible embodiment, the first magnetic ring temperature is calculated by: determining an average value of the magnetic ring inner diameter temperature and the magnetic ring outer diameter temperature acquired by the thermal resistance sensor A1 as the first magnetic ring temperature; the second magnetic loop temperature is calculated by: and determining the average value of the magnetic ring inner diameter temperature and the magnetic ring outer diameter temperature acquired by the thermal resistance sensor A2 as the second magnetic ring temperature.
In one possible implementation, the material of the magnetic ring may be any kind of magnetic ring material.
In one possible embodiment, the magnetic ring uses soft magnetic material.
In one possible implementation manner, the material of the magnetic ring is any one of the following materials: silicon steel, ferrite, amorphous, nanocrystalline.
The magnetic characteristic measuring device based on the magnetic ring self-heating provided by the embodiment of the application can be used for respectively carrying out self-heating, demagnetization and magnetic characteristic measurement on the magnetic ring to be measured. Applying high-frequency low-flux alternating current excitation to the magnetic ring, and generating eddy current loss self-heating temperature rise by the magnetic ring; when the thermal resistance sensor detects that the temperature of the magnetic ring exceeds a certain temperature, the temperature controller controls the contactor to disconnect the high-frequency excitation circuit, and the low-frequency demagnetization circuit is conducted to demagnetize the magnetic ring; when the temperature of the magnetic ring is reduced to the test temperature, the low-frequency demagnetization circuit is turned off, and the magnetic characteristic measurement is carried out on the magnetic ring at the given temperature by combining with the annular sample test method. The embodiment of the application can accurately control the heating time of the magnetic ring, measure the magnetic characteristic at the specified working temperature of the magnetic ring and improve the accuracy of magnetic characteristic measurement.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a circuit topology diagram of a magnetic characteristic measurement device based on magnetic ring self-heating provided by an embodiment of the application;
FIG. 2 shows a self-elevating Wen Motai diagram of a magnetic characteristic measurement device based on magnetic ring self-heating according to an embodiment of the present application;
FIG. 3 shows a demagnetization modal diagram of a magnetic characteristic measurement device based on self-heating of a magnetic ring, provided by an embodiment of the application;
fig. 4 shows a magnetic characteristic measurement mode diagram of the magnetic characteristic measurement device based on magnetic ring self-heating provided by the embodiment of the application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
The soft magnetic materials represented by silicon steel, ferrite, amorphous and nanocrystalline are widely applied to transformers and motor cores, and the accurate test of the magnetic characteristics of the soft magnetic materials has important significance for the overall optimization of transformers and motors and the design of peripheral insulating devices and heat dissipation devices.
At present, researchers at home and abroad put forward various classical measurement methods including a ring sample test method, a single-chip test method, an Epstein method and the like aiming at the two-dimensional magnetic characteristics of the soft magnetic materials, and considering that the iron core soft magnetic materials such as transformers, motors and the like can reach a certain working temperature during actual operation, the traditional method is based on measurement in a laboratory normal-temperature environment, so that the measurement of the magnetic characteristics of the soft magnetic materials at different temperatures becomes a current research hot spot.
At present, a ring sample test method is adopted for testing magnetic characteristics of soft magnetic materials at different temperatures in combination with an incubator, and a magnetic ring is placed in the incubator to be heated to a test temperature, and a lead is led out for measurement.
However, when the magnetic ring is placed in the incubator to be heated, no feasible heating duration estimation method is currently available, the heating duration of the magnetic ring is generally controlled by virtue of experimental experience, if the heating duration is too short, the problem of unbalanced surface temperature and internal temperature of the magnetic ring exists, if the heating duration is too long, the magnetic ring is easy to cause ageing of winding wires of the magnetic ring, and the magnetic characteristics of the magnetic ring are difficult to be measured at the specified test temperature and when the performance of the wires is excellent. In addition, the magnetic characteristics of the magnetic ring at different temperatures are measured, wherein the temperature refers to the working temperature, not the ambient temperature, but the magnetic ring is heated in the incubator, the temperature of the surface of the magnetic ring and the temperature of the interior of the magnetic ring are changed through the external ambient temperature, even if the temperature of the magnetic ring is increased, the increased temperature is the ambient temperature instead of the working temperature, in a simple way, the temperature increasing mode of heating the magnetic ring by adopting the incubator is adopted, the magnetic characteristics at different ambient temperatures are measured, and the measurement of the magnetic characteristics at different working temperatures is not completed, so that the accuracy of the magnetic characteristic measurement data is greatly influenced.
Based on the above problems, the embodiment of the application provides a magnetic characteristic measurement device based on self-heating of a magnetic ring, which can respectively perform self-heating, demagnetization and magnetic characteristic measurement on the magnetic ring to be measured. The magnetic ring is excited by high-frequency low-flux alternating current, eddy current loss is generated by the magnetic ring, the temperature of the inner diameter and the outer diameter of the magnetic ring is automatically heated, a thermal resistance sensor respectively collects the temperature of the inner diameter and the temperature of the outer diameter of the magnetic ring, and whether the magnetic ring reaches the test temperature is judged according to the average value of the temperature of the inner diameter and the temperature of the outer diameter of the magnetic ring, so that the magnetic ring works at the test temperature, and the problem that the surface temperature and the internal temperature of the magnetic ring are inconsistent can be well solved by adopting the method of automatically heating and the average value of the inner diameter and the outer diameter of the magnetic ring; because the working temperature of the magnetic ring has certain loss in the demagnetization process, the working temperature of the magnetic ring is required to be higher than the test temperature before the demagnetization, when the thermal resistance sensor detects that the temperature of the magnetic ring exceeds the test temperature by a certain temperature, the temperature controller controls the contactor to disconnect the high-frequency excitation circuit, and the low-frequency demagnetization circuit is conducted to perform the demagnetization treatment on the magnetic ring; when the temperature of the magnetic ring is reduced to the test temperature, the low-frequency demagnetization circuit is turned off, and the magnetic characteristic measurement is carried out on the magnetic ring at the given temperature by combining with the annular sample test method. The embodiment of the application can accurately control the temperature rise time of the magnetic ring, measure the magnetic characteristic at the appointed working temperature of the magnetic ring, and improve the accuracy of magnetic characteristic measurement.
The following description of the embodiments of the present application will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the application are shown. The components of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The embodiment of the application provides a magnetic characteristic measuring device based on magnetic ring self-heating, which is additionally arranged on a magnetic ring and is used for respectively carrying out self-heating, demagnetization and magnetic characteristic measurement on the magnetic ring, and comprises a high-frequency excitation circuit, a low-frequency demagnetization circuit and a magnetic characteristic measuring circuit. The high-frequency excitation circuit includes: the device comprises an adjustable direct current power supply A1, a high-frequency inverter circuit, a contactor A1, a temperature controller A1, a thermal resistance sensor A1 and a winding A; the low frequency demagnetization circuit includes: the device comprises an adjustable direct current power supply A2, a low-frequency inverter circuit, a contactor A2, a temperature controller A2, a thermal resistance sensor A2 and a winding A, wherein the winding A is connected with the temperature controller A; the magnetic characteristic measuring circuit comprises a signal generator, a power amplifier, a precision resistor, a digital sampler, a winding B and a winding C.
Referring to fig. 1, fig. 1 is a circuit topology diagram of a magnetic characteristic measurement device based on magnetic ring self-heating provided by an embodiment of the present application, and in fig. 1, connection relations among an adjustable dc power supply A1, a high-frequency inverter circuit, a contactor A1, a temperature controller A1, a thermal resistance sensor A1, and a winding a are shown; the connection relation among the adjustable direct current power supply A2, the low-frequency inverter circuit, the contactor A2, the temperature controller A2, the thermal resistance sensor A2 and the winding A is realized; and the connection relation of the power amplifier, the precision resistor, the digital sampler, the winding B and the winding C.
The high-frequency inverter circuit is composed of a capacitor C1 and switching tubes S1, S2, S3 and S4, the low-frequency demagnetization circuit is composed of a capacitor C2 and switching tubes S5, S6, S7 and S8, a winding A, a winding B and a winding C are uniformly wound on a magnetic ring, A+ is a wire inlet end of the winding A, A-is a wire outlet end of the winding A, B+ is a wire inlet end of the winding B, B-is a wire outlet end of the winding B, C+ is a wire inlet end of the winding C, C-is a wire outlet end of the winding C, and the high-frequency excitation circuit and the low-frequency demagnetization circuit share the winding A.
The embodiment of the application provides a magnetic characteristic measurement device based on magnetic ring self-heating, which comprises three working modes, namely a self-heating Wen Motai mode, a demagnetizing mode and a magnetic characteristic measurement mode.
Referring to fig. 2, fig. 2 is a self-lifting Wen Motai diagram of a magnetic characteristic measurement device based on magnetic ring self-heating provided by an embodiment of the present application, where the contactor A1 is used for switching on and off the high-frequency inverter circuit, and the contactor A1 is normally closed to conduct the high-frequency inverter circuit; the high-frequency inverter circuit is connected with the adjustable direct current power supply A1 and is used for generating high-frequency low-magnetic density alternating current excitation; the winding A surrounds the magnetic ring and is connected with the high-frequency inverter circuit, and is used for applying the high-frequency low-density alternating current excitation to the magnetic ring so as to enable the magnetic ring to generate eddy current loss and self-heat; the thermal resistance sensor A1 is arranged on the magnetic ring and connected with the temperature controller A1, and is used for collecting the first magnetic ring temperature of the magnetic ring and sending the first magnetic ring temperature to the temperature controller A1; if the temperature of the first magnetic ring is greater than a preset temperature threshold, the temperature controller A1 controls the contactor A1 to be normally open, and the high-frequency inverter circuit is disconnected; the preset temperature threshold is greater than the test temperature of the magnetic ring.
At self-elevating Wen Motai, contactor A1 is normally closed, high frequency inverter circuit is conducted, high frequency inverter circuit adjusts the direct current output by adjustable direct current power supply A1 into high frequency low magnetic density alternating current excitation, high frequency low magnetic density alternating current excitation acts on magnetic ring through winding A uniformly wound on magnetic ring, magnetic ring generates eddy current loss, magnetic ring self-heating temperature rise, working temperature of magnetic ring is gradually increased until working temperature of magnetic ring is greater than preset temperature threshold, contactor A1 is normally opened, high frequency inverter circuit is disconnected, self-elevating temperature mode is finished.
It should be noted that, the preset temperature threshold is greater than the test temperature of the magnetic ring, and a part of the magnetic ring has temperature loss in the demagnetization process, so in the self-heating link of the magnetic ring, the working temperature of the magnetic ring is greater than the test temperature, for example, the test temperature is 80 ℃, the preset temperature threshold is 85 ℃, and the loss of 5 ℃ is reserved for the demagnetization link. In practice, the magnetic characteristics of the magnetic ring at different working temperatures need to be measured, and before each measurement, the preset temperature threshold may be adjusted so that the preset temperature threshold matches the current test temperature, for example, the preset temperature threshold is equal to the test temperature plus 5 ℃.
Referring to fig. 3, fig. 3 is a demagnetization mode diagram of a magnetic characteristic measurement device based on magnetic ring self-heating provided by an embodiment of the present application, where the contactor A2 is used for switching on and off the low-frequency inverter circuit, and the contactor A2 is normally closed to conduct the low-frequency inverter circuit; the low-frequency inverter circuit is connected with the adjustable direct current power supply A2 and is used for generating a low-frequency alternating current square wave; the winding A surrounds the magnetic ring and is connected with the low-frequency inverter circuit, and is used for demagnetizing the magnetic ring under the action of the low-frequency alternating-current square wave; the thermal resistance sensor A2 is arranged on the magnetic ring and connected with the temperature controller A2, and is used for collecting the temperature of a second magnetic ring of the magnetic ring and sending the temperature of the second magnetic ring to the temperature controller A2; and if the temperature of the second magnetic ring is equal to the test temperature, the temperature controller A2 controls the contactor A2 to be normally open, the low-frequency inverter circuit is disconnected, and the magnetic characteristic measuring circuit is conducted.
In a demagnetization mode, the contactor A2 is normally closed, the low-frequency inverter circuit is conducted, the low-frequency inverter circuit adjusts direct current output by the adjustable direct current power supply A2 into low-frequency alternating current square waves, the low-frequency alternating current square waves act on the magnetic ring through windings A uniformly wound on the magnetic ring to demagnetize the magnetic ring, the working temperature of the magnetic ring is detected in real time in the demagnetization process, when the working temperature of the magnetic ring is reduced to a test temperature, the contactor A2 is normally open, the low-frequency inverter circuit is disconnected, the demagnetization mode is finished, the magnetic characteristic measuring circuit is conducted, and the magnetic characteristic measuring mode is started.
Referring to fig. 4, fig. 4 is a magnetic characteristic measurement mode diagram of a magnetic characteristic measurement device based on magnetic ring self-heating, and the signal generator is connected with the power amplifier; the winding B surrounds the magnetic ring and is connected with the power amplifier after being connected with the precise resistor in series; the digital sampler is connected with the precision resistor in parallel; the winding C surrounds the magnetic ring and is connected with the digital sampler.
And in a magnetic characteristic measurement mode, measuring the magnetic characteristic of the magnetic ring to be measured at the test temperature.
Since fig. 2, 3 and 4 show the high-frequency excitation circuit, the low-frequency demagnetization circuit and the magnetic characteristic measurement circuit in the magnetic characteristic measurement apparatus of fig. 1, respectively, the chromaticity of the irrelevant elements and lines is reduced in fig. 2, 3 and 4 to emphasize the elements and lines involved in the operation in the high-frequency excitation circuit, the low-frequency demagnetization circuit and the magnetic characteristic measurement circuit.
According to the magnetic characteristic measuring device based on magnetic ring self-heating, provided by the embodiment of the application, the working temperature of the magnetic ring to be measured is detected in real time by using the thermal resistance sensor, and when the working temperature is greater than the preset temperature threshold, the self-heating treatment of the magnetic ring to be measured is stopped, so that the heating time of the magnetic ring to be measured can be accurately controlled. In addition, when the temperature of the magnetic ring to be detected is raised, high-frequency low-magnetic density alternating current excitation is applied to the magnetic ring to be detected, so that the magnetic ring to be detected generates eddy current loss self-heating temperature rise, the temperature rise mode is improved by the working temperature of the magnetic ring to be detected, the temperature rise mode is completely different from the environment temperature of the magnetic ring to be detected by using a constant temperature box, the magnetic characteristic measurement of the magnetic ring at different working temperatures can be completed, and the accuracy of magnetic characteristic measurement data is improved.
Further, the windings a, B and C used by the high-frequency excitation circuit and the low-frequency demagnetization circuit are uniformly wound on the magnetic ring to be measured, and as an alternative implementation manner, as shown in fig. 1, the windings a, B and C are wound on the magnetic ring to be measured in parallel.
Further, the heat insulation material is needed to be used for heat insulation of the magnetic ring, and the specific adding mode is as follows: and wrapping heat insulation materials around the magnetic ring, wherein the heat insulation materials are wrapped on the winding A, the winding B and the winding C, and the broken lines on the inner side and the outer side of the circular ring (the magnetic ring) are used for representing the heat insulation materials, as shown in figures 1,2, 3 and 4.
Further, the thermal resistance sensor A1 is respectively installed at a first inner diameter position point and a first outer diameter position point of the magnetic ring, and a connecting line of the first inner diameter position point and the first outer diameter position point passes through the circle center of the magnetic ring; and the thermal resistance sensor A2 is respectively arranged at a second inner diameter position point and a second outer diameter position point of the magnetic ring, and a connecting line of the second inner diameter position point and the second outer diameter position point passes through the circle center of the magnetic ring.
Referring to fig. 1, 2 and 3, a black solid rectangle added on a magnetic ring represents a thermal resistance sensor, two thermal resistance sensors at the upper left of the magnetic ring are thermal resistance sensors A1, and two thermal resistance sensors at the lower left of the magnetic ring are thermal resistance sensors A2.
Further, the first magnetic ring temperature is calculated by: determining an average value of the magnetic ring inner diameter temperature and the magnetic ring outer diameter temperature acquired by the thermal resistance sensor A1 as the first magnetic ring temperature; the second magnetic loop temperature is calculated by: and determining the average value of the magnetic ring inner diameter temperature and the magnetic ring outer diameter temperature acquired by the thermal resistance sensor A2 as the second magnetic ring temperature.
The thermal resistance sensor A1 is arranged at a first inner diameter position point, and the thermal resistance sensor A2 is arranged at a second inner diameter position point and is used for collecting the inner diameter temperature of the magnetic ring to be detected; the thermal resistance sensor A1 is arranged at the first outer diameter position point, and the thermal resistance sensor A2 is arranged at the second outer diameter position point and is used for collecting the outer diameter temperature of the magnetic ring to be measured. In the embodiment of the application, under the action of high-frequency low-flux alternating current excitation, the magnetic ring generates eddy current loss self-heating temperature rise, the temperature rise mode can cause slight difference between the inner diameter temperature and the outer diameter temperature of the magnetic ring, and the average value of the inner diameter temperature and the outer diameter temperature is used as the working temperature of the magnetic ring, so that the accuracy of magnetic ring temperature detection can be improved. Specifically, the thermal resistance sensor A1 (thermal resistance sensor A2) detects the magnetic ring inner diameter temperature and the magnetic ring outer diameter temperature, respectively, and the temperature controller A1 (temperature controller A2) determines whether to open the contactor A1 (contactor A2) according to the average value of the magnetic ring inner diameter temperature and the magnetic ring outer diameter temperature, so as to disconnect the high-frequency inverter circuit (low-frequency inverter circuit). In self-elevating Wen Motai, if the average value of the temperature of the inner diameter and the outer diameter of the magnetic ring is larger than a preset temperature threshold value, a normally open contactor A1 is opened, and a high-frequency inverter circuit is disconnected; in the demagnetization mode, if the average value of the temperature of the inner diameter and the outer diameter of the magnetic ring is equal to the test temperature, the normally open contactor A2 is opened, and the low-frequency inverter circuit is disconnected.
Further, the material of the magnetic ring can be any kind of magnetic ring material, such as iron-silicon-aluminum, iron powder core and permalloy.
Alternatively, soft magnetic materials are used as the material of the magnetic ring.
Optionally, the magnetic ring is made of any one of the following materials: silicon steel, ferrite, amorphous, nanocrystalline.
Finally, it should be noted that: the above examples are only specific embodiments of the present application, and are not intended to limit the scope of the present application, but it should be understood by those skilled in the art that the present application is not limited thereto, and that the present application is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (8)
1. The magnetic characteristic measuring device based on the self-heating of the magnetic ring is characterized in that the measuring device is additionally arranged on the magnetic ring and is used for respectively carrying out self-heating, demagnetization and magnetic characteristic measurement on the magnetic ring, and the magnetic characteristic measuring device comprises a high-frequency excitation circuit, a low-frequency demagnetization circuit and a magnetic characteristic measuring circuit;
The high-frequency excitation circuit includes: the device comprises an adjustable direct current power supply A1, a high-frequency inverter circuit, a contactor A1, a temperature controller A1, a thermal resistance sensor A1 and a winding A; the contactor A1 is used for switching on and off the high-frequency inverter circuit, and the contactor A1 is normally closed and conducts the high-frequency inverter circuit; the high-frequency inverter circuit is connected with the adjustable direct current power supply A1 and is used for generating high-frequency low-magnetic density alternating current excitation; the winding A surrounds the magnetic ring and is connected with the high-frequency inverter circuit, and is used for applying the high-frequency low-density alternating current excitation to the magnetic ring so as to enable the magnetic ring to generate eddy current loss and self-heat; the thermal resistance sensor A1 is arranged on the magnetic ring and connected with the temperature controller A1, and is used for collecting the first magnetic ring temperature of the magnetic ring and sending the first magnetic ring temperature to the temperature controller A1; if the temperature of the first magnetic ring is greater than a preset temperature threshold, the temperature controller A1 controls the contactor A1 to be normally open, and the high-frequency inverter circuit is disconnected; the preset temperature threshold is greater than the test temperature of the magnetic ring;
The low frequency demagnetization circuit includes: the device comprises an adjustable direct current power supply A2, a low-frequency inverter circuit, a contactor A2, a temperature controller A2, a thermal resistance sensor A2 and a winding A, wherein the winding A is connected with the temperature controller A; the contactor A2 is used for switching on and off the low-frequency inverter circuit, and the contactor A2 is normally closed to conduct the low-frequency inverter circuit; the low-frequency inverter circuit is connected with the adjustable direct current power supply A2 and is used for generating a low-frequency alternating current square wave; the winding A surrounds the magnetic ring and is connected with the low-frequency inverter circuit, and is used for demagnetizing the magnetic ring under the action of the low-frequency alternating-current square wave; the thermal resistance sensor A2 is arranged on the magnetic ring and connected with the temperature controller A2, and is used for collecting the temperature of a second magnetic ring of the magnetic ring and sending the temperature of the second magnetic ring to the temperature controller A2; if the temperature of the second magnetic ring is equal to the test temperature, the temperature controller A2 controls the contactor A2 to be normally open, the low-frequency inverter circuit is disconnected, and the magnetic characteristic measuring circuit is conducted;
The magnetic characteristic measuring circuit comprises a signal generator, a power amplifier, a precision resistor, a digital sampler, a winding B and a winding C; wherein the signal generator is connected with the power amplifier; the winding B surrounds the magnetic ring and is connected with the power amplifier after being connected with the precise resistor in series; the digital sampler is connected with the precision resistor in parallel; the winding C surrounds the magnetic ring and is connected with the digital sampler.
2. The magnetic characteristic measurement device based on magnetic ring self-heating as claimed in claim 1, wherein the winding a, the winding B and the winding C are wound around the magnetic ring in parallel.
3. The magnetic characteristic measurement device based on magnetic ring self-heating as claimed in claim 1, wherein a thermal insulation material is wrapped around the magnetic ring on the winding a, the winding B and the winding C.
4. The magnetic characteristic measurement device based on magnetic ring self-heating as claimed in claim 1, wherein the thermal resistance sensor A1 is respectively installed at a first inner diameter position point and a first outer diameter position point of the magnetic ring, and a connecting line of the first inner diameter position point and the first outer diameter position point passes through a circle center of the magnetic ring; and the thermal resistance sensor A2 is respectively arranged at a second inner diameter position point and a second outer diameter position point of the magnetic ring, and a connecting line of the second inner diameter position point and the second outer diameter position point passes through the circle center of the magnetic ring.
5. The magnetic characteristic measurement apparatus based on magnetic ring self-warming as recited in claim 4, wherein the first magnetic ring temperature is calculated by: determining an average value of the magnetic ring inner diameter temperature and the magnetic ring outer diameter temperature acquired by the thermal resistance sensor A1 as the first magnetic ring temperature; the second magnetic loop temperature is calculated by: and determining the average value of the magnetic ring inner diameter temperature and the magnetic ring outer diameter temperature acquired by the thermal resistance sensor A2 as the second magnetic ring temperature.
6. The magnetic characteristic measuring device based on magnetic ring self-heating as claimed in claim 1, wherein the magnetic ring can be made of any magnetic ring material.
7. The magnetic characteristic measurement apparatus based on self-heating of a magnetic ring according to claim 6, wherein the magnetic ring uses a soft magnetic material.
8. The magnetic characteristic measurement device based on magnetic ring self-heating as claimed in claim 7, wherein the magnetic ring is made of any one of the following materials: silicon steel, ferrite, amorphous, nanocrystalline.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410109112.4A CN117930091A (en) | 2024-01-26 | 2024-01-26 | Magnetic characteristic measuring device based on magnetic ring self-heating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410109112.4A CN117930091A (en) | 2024-01-26 | 2024-01-26 | Magnetic characteristic measuring device based on magnetic ring self-heating |
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| CN117930091A true CN117930091A (en) | 2024-04-26 |
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| CN202410109112.4A Pending CN117930091A (en) | 2024-01-26 | 2024-01-26 | Magnetic characteristic measuring device based on magnetic ring self-heating |
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- 2024-01-26 CN CN202410109112.4A patent/CN117930091A/en active Pending
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