Detection method for distinguishing magnetic performance of flaky magnetic core

Abstract

The invention provides a detection method for distinguishing the magnetic performance of a sheet-shaped magnetic core, and relates to the technical field of sensor design, and the method comprises the steps: S101, manufacturing a measuring coil; s102, manufacturing a clamp according to the size of the magnetic core and the size of the measuring coil; s103, the measuring coil is connected to an LCR instrument, and the strength of the magnetic performance of the magnetic core is represented by measuring the inductance value; and S104, fixing the position of the measured magnetic core in the inner cavity of the measuring coil by using the clamp, recording the inductance value measured by the LCR instrument at the corresponding position point on the clamp, and finally representing the strength of the magnetic performance of the magnetic core by using the value of the position point 1. According to the method, the technical problem that the magnetic performance of the sheet-shaped magnetic core is not specifically quantified before the sensitive element is assembled is solved, and data support is provided for the design and technological process, so that the utilization rate of the magnetic core in the assembling process is increased, and the production efficiency of the sensor is improved.

Description

Technical Field

[0001] The invention relates to the technical field of sensor design, and in particular provides a detection method for distinguishing the magnetic properties of a sheet magnetic core. Background Art

[0002] In the production of sensitive coils, the magnetic core is made of 1J779 iron-nickel soft magnetic alloy sheet as raw material, and is made through punching, heat treatment, and cleaning processes, and then the magnetic core is assembled into the coil to make a sensitive coil. At present, since there is no corresponding measurement method for the magnetic properties of the magnetic core itself, most of the magnetic parameters are measured on the material samples in the same furnace as the heat treatment. If the magnetic properties of the samples are qualified, the magnetic properties of the magnetic core are considered qualified. However, after being assembled into a sensitive coil, the zero position and deflection angle of the sensor in use are difficult to meet the use requirements. The utilization rate of the magnetic core has been at a low level, resulting in a large waste of magnetic cores and labor hours, which seriously affects the delivery of production tasks.

[0003] Therefore, it is necessary to provide a method for directly detecting the magnetic properties of the magnetic core itself so as to control the magnetic properties of the magnetic core during the processing. Summary of the invention

[0004] The purpose of the present application is to solve the shortcoming of the prior art that it is difficult to directly detect the magnetic properties of the magnetic core itself, and to propose a detection method for distinguishing the magnetic properties of a sheet magnetic core.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: a detection method for distinguishing the magnetic properties of a sheet magnetic core, the method comprising:

[0006] S101: Determine the skeleton size of the measuring coil and the number of turns of the measuring coil according to the specific size of the magnetic core itself and its use environment, and manufacture the measuring coil;

[0007] S102: Making a fixture according to the size of the magnetic core and the measuring coil, wherein the length of the fixture is 2 to 3 mm greater than the length of the measuring coil;

[0008] S103: Connect the measuring coil to the LCR meter and measure the inductance value to characterize the strength of the magnetic performance of the magnetic core;

[0009] S104: Use a fixture to fix the magnetic core to be measured in the position of the inner cavity of the measuring coil, set five position points 0, 1 / 4, 1 / 2, 3 / 4, and 1 on the fixture, record the inductance values ​​measured by the LCR meter at the corresponding position points, and finally use the value of position point 1 to characterize the strength of the magnetic performance of the magnetic core.

[0010] The detection method for distinguishing the magnetic properties of sheet magnetic cores provided by the present invention also has the following technical characteristics: the measuring coil in S101 uses enameled wire with a diameter of 0.2 mm, which is evenly distributed on the frame of the measuring coil, and the number of coil turns uses the number of coil turns of the magnetic core assembled later.

[0011] The detection method for distinguishing the magnetic properties of a sheet magnetic core provided by the present invention also has the following technical features: the inner cavity size of the skeleton matches the clearance of the fixture, and the skeleton material is bakelite or hard plastic.

[0012] The detection method for distinguishing the magnetic properties of a sheet magnetic core provided by the present invention also has the following technical features: a position point mark is provided on the fixture, and the fixture is made of brass.

[0013] The detection method for resolving the magnetic properties of a sheet magnetic core provided by the present invention also has the following technical features: the measurement accuracy of the LCR meter is not less than 0.05%.

[0014] The detection method for distinguishing the magnetic properties of a sheet magnetic core provided by the present invention also has the following technical features: the fixture is provided with a groove for accommodating the magnetic core and an opening for placing or removing the magnetic core.

[0015] The detection method for distinguishing the magnetic properties of a sheet magnetic core provided by the present invention also has the following technical feature: the depth of the groove is the same as the thickness of the magnetic core.

[0016] Beneficial Effects

[0017] The detection method for distinguishing the magnetic properties of sheet magnetic cores proposed in the present invention solves the technical problem that the magnetic properties of sheet magnetic cores cannot be specifically quantified before assembling sensitive components, and provides data support for the design and process, thereby improving the utilization rate of the magnetic cores in the assembly process and improving the production efficiency of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic diagram of the installation of the detection process of the detection method for distinguishing the magnetic properties of a sheet magnetic core provided by the present invention;

[0020] Figure 2 A schematic diagram of the structure of a clamp provided by an embodiment of the present invention;

[0021] Figure 3 for Figure 2Top view of the provided fixture,

[0022] Among them, 1: skeleton; 2: measuring coil; 3: fixture feeding hole; 4: fixture; 5: position point mark; 6: opening. DETAILED DESCRIPTION

[0023] The present application is further described in detail below in conjunction with the accompanying drawings and examples, but it should be noted that these implementation methods are not limitations of the present application, and equivalent changes or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these implementation methods are all within the scope of protection of the present application.

[0024] In the description of the embodiments of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "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 creation of the present application 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 operated in a specific orientation, and therefore cannot be understood as a limitation on the creation of the present application.

[0025] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0026] The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention of this application can be understood by specific circumstances.

[0027] like Figure 1-3 As shown, an embodiment of the present application provides a detection method for distinguishing the magnetic properties of a sheet magnetic core, the method comprising:

[0028] S101: Determine the size of the frame 1 of the measuring coil and the number of turns of the measuring coil 2 according to the specific size of the magnetic core itself and its use environment, and manufacture the measuring coil 2;

[0029] S102: manufacturing a fixture 4 according to the size of the magnetic core and the measuring coil 2, wherein the length of the fixture 4 is 2 to 3 mm greater than the length of the measuring coil 2;

[0030] S103: Connect the measuring coil 2 to the LCR meter, and measure the inductance value to characterize the strength of the magnetic performance of the magnetic core;

[0031] S104: Fix the magnetic core to be measured in the inner cavity of the measuring coil 2 by using the fixture 4, set five position points 0, 1 / 4, 1 / 2, 3 / 4, and 1 on the fixture 4, record the inductance values ​​measured by the LCR meter at the corresponding position points, and finally use the value of the position point 1 to characterize the strength of the magnetic performance of the magnetic core.

[0032] In some embodiments, the measuring coil 2 in S101 uses enameled wire with a diameter of 0.2 mm, which is evenly distributed on the frame 1 of the measuring coil 2, and the number of turns of the coil is the number of turns of the coil assembled later on the magnetic core.

[0033] In some embodiments, the inner cavity size of the frame 1 is in clearance with the clamp 4, and the frame material is bakelite or hard plastic. The frame is provided with a clamp insertion hole 3 for inserting the clamp.

[0034] In some embodiments, the clamp 4 is provided with a position point mark 5, and the material of the clamp 4 is brass.

[0035] In some embodiments, the measurement accuracy of the LCR meter is not less than 0.05%.

[0036] In some embodiments, the fixture 4 is provided with a groove for accommodating the magnetic core and an opening 6 for placing or removing the magnetic core.

[0037] In some embodiments, the depth of the groove is the same as the thickness of the magnetic core.

[0038] The detection is performed using any of the detection methods described above, specifically as follows;

[0039] Example 1

[0040] The present invention was used to measure two batches of 5 iron cores processed in the previous year 2023. The data of the three measurements are shown in Table 1:

[0041] Table 1: Statistical table of core magnetic parameters and tachometer performance

[0042]

[0043] From the measurement results of the inductance of the above 10 stator cores, it can be seen that the method of the present invention can clearly distinguish the performance differences between the cores, which fully demonstrates that the measurement method is effective and has practical value.

[0044] Example 2

[0045] According to the inductance values ​​of the above 10 cores, the cores in the same furnace were selected, and 4 cores were assembled into a group with sensitive coils for sensor performance test. The test results are shown in Table 2:

[0046] Table 2: Statistical table of core magnetic parameters and tachometer performance

[0047] Serial number Inductance(mH) Sensor Performance 01-01 1.1624 Failure 01-02 1.1454 Failure 01-03 1.1664 Failure 01-04 1.1584 Failure 01-05 1.1403 Failure 02-01 1.1984 qualified 02-02 1.1956 qualified 02-03 1.2169 qualified 02-04 1.2148 qualified 02-05 1.2213 qualified

[0048] Judging from the results of later tests, the performance of the second batch of magnetic cores meets the requirements of the sensor zero position and deflection angle after the sensitive coil is installed, which further shows that the measurement method is effective and practical, and has guiding significance for the design and process control of the magnetic properties of the sensor core.

[0049] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A method for detecting the magnetic properties of a sheet magnetic core, characterized in that: The method comprises: S101: Determine the skeleton size of the measuring coil and the number of turns of the measuring coil according to the specific size of the magnetic core itself and its use environment, and manufacture the measuring coil; S102: Making a fixture according to the size of the magnetic core and the measuring coil, wherein the length of the fixture is 2 to 3 mm greater than the length of the measuring coil; S103: Connect the measuring coil to the LCR meter and measure the inductance value to characterize the strength of the magnetic performance of the magnetic core; S104: Use a fixture to fix the magnetic core to be measured in the position of the inner cavity of the measuring coil, set five position points 0, 1 / 4, 1 / 2, 3 / 4, and 1 on the fixture, record the inductance values ​​measured by the LCR meter at the corresponding position points, and finally use the value of position point 1 to characterize the strength of the magnetic performance of the magnetic core.

2. The method for detecting the magnetic properties of a sheet magnetic core according to claim 1, characterized in that: The measuring coil in S101 uses enameled wire with a diameter of 0.2mm, which is evenly distributed on the frame of the measuring coil. The number of turns of the coil is the same as the number of turns of the coil assembled later on the magnetic core.

3. The method for detecting the magnetic properties of a sheet magnetic core according to claim 2, characterized in that: The inner cavity size of the skeleton matches the clearance of the fixture, and the skeleton material is bakelite or hard plastic.

4. The method for detecting the magnetic properties of a sheet magnetic core according to claim 1, characterized in that: The fixture is provided with a position point mark, and the fixture is made of brass.

5. The method for detecting the magnetic properties of a sheet magnetic core according to claim 1, characterized in that: The measurement accuracy of the LCR meter is not less than 0.05%.

6. The method for detecting the magnetic properties of a sheet magnetic core according to claim 1, characterized in that: The clamp is provided with a groove for accommodating the magnetic core and an opening for placing or taking out the magnetic core.

7. The method for detecting the magnetic properties of a sheet magnetic core according to claim 6, characterized in that: The depth of the groove is the same as the thickness of the magnetic core.

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