CN109613457B - Magnetic steel performance detection method - Google Patents
Magnetic steel performance detection method Download PDFInfo
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- CN109613457B CN109613457B CN201811632429.7A CN201811632429A CN109613457B CN 109613457 B CN109613457 B CN 109613457B CN 201811632429 A CN201811632429 A CN 201811632429A CN 109613457 B CN109613457 B CN 109613457B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
Abstract
Providing a magnetic steel performance detection method, preliminarily selecting magnetic steel to be measured; manufacturing a magnetic flux measuring coil clamp, and recording the number of turns of a coil of the clamp; clamping the primarily selected magnetic steel to be measured between pole palms of a magnetizer for magnetization; putting the magnetized magnetic steel to be measured into a flux measurement coil clamp, connecting the flux measurement coil clamp with a digital fluxmeter, pressing a reset button of the digital fluxmeter to enable data displayed by the digital fluxmeter to be zero, moving the magnetic steel to be measured out of the flux measurement coil clamp, and processing the data by the digital fluxmeter to obtain the variation of magnetic flux, wherein the variation is directly displayed on the digital fluxmeter; and calculating the open-circuit magnetic flux Mx of the magnetic steel to be measured according to a formula. According to the invention, the open-circuit magnetic flux Mx of the magnetic steel is accurately measured, so that the optimized coercive force of the magnetic steel material meeting the performance of the product is indirectly realized, the material quality of the part is well related from the source, the performance requirement of the product is met, the production efficiency is improved, and the product quality is improved.
Description
Technical Field
The invention relates to a magnetic steel performance detection method, which is mainly suitable for a magnetoelectric system ammeter.
Background
In production, the problem that the performance of the ammeter is unqualified due to the weak performance of magnetic steel often occurs to the magnetoelectric system ammeter, and the problem troubles production for a long time. In order to reduce the problem, a magnetizing machine is mainly used for magnetizing for multiple times to strengthen magnetism. This method has the following disadvantages: the performance of the magnetic steel is weakened too fast, the magnetizing times are multiple, the problem of weak magnetic property of the magnetic steel cannot be solved fundamentally by a multi-time magnetizing method, and the product quality cannot be improved fundamentally. Certainly, the problem of multiple magnetizing can be solved by selecting a material with good performance as the magnetic steel of the ammeter, but the selection of the material performance of the magnetic steel is difficult, for example, the material of the magnetic steel BD2001 in the BD-1 ammeter is LNGT32 alnico, the required coercive force Hc is not less than 79.6KA/m, the magnetic steel with higher coercive force can improve the performance of the ammeter, but the coercive force Hc is the reverse magnetic field strength required by reducing the remanence B of the permanent magnet magnetized to saturation to zero, and is a measure index of the magnetic durability and the magnetic strength of the magnetic steel, and the direct measurement is difficult to realize. Therefore, it is very necessary to provide a method capable of rapidly detecting the performance of the magnetic steel to help people select the magnetic steel with good performance.
Disclosure of Invention
The technical problems solved by the invention are as follows: the invention provides a magnetic steel performance detection method, which is characterized in that high-performance magnetic steel with lasting magnetic force and strong magnetism is selected by accurately measuring the open-circuit magnetic flux Mx of the magnetic steel, namely, under the condition that the magnet material is determined, a magnetic steel part is not damaged, the magnetic steel part with good performance is selected by the method for detecting the open-circuit magnetic flux, the magnetic steel material with coercive force meeting the product performance is indirectly selected, the material quality of the part is well controlled from the source, the performance requirement of the product is met, the magnetizing frequency of a magnetoelectric system galvanometer is reduced, the production efficiency is improved, the product quality is improved, and the product reliability is improved.
The technical scheme adopted by the invention is as follows: the magnetic steel performance detection method comprises the following steps:
the method comprises the following steps: preliminarily selecting magnetic steel to be measured;
step two: manufacturing a magnetic flux measuring coil clamp, and recording the number of turns of a coil of the clamp;
step three: clamping the magnetic steel to be measured preliminarily selected in the step one between the pole palms of the magnetizer, and switching on a 180V direct-current power supply for magnetization;
step four: putting the magnetic steel to be measured after the magnetization in the third step into a magnetic flux measuring coil clamp;
step five: connecting two outgoing lines on the magnetic flux measuring coil clamp with a binding post of the digital magnetic flux meter, connecting 220V and 50Hz alternating current voltage to the digital magnetic flux meter, pressing a reset button of the digital magnetic flux meter to enable data displayed by the digital magnetic flux meter to be zero, moving out the magnetic steel to be measured from the magnetic flux measuring coil clamp, and obtaining the variable quantity of magnetic flux through data processing of the digital magnetic flux meter, wherein the variable quantity is directly displayed on the digital magnetic flux meter;
step six: calculating the open-circuit magnetic flux Mx of the magnetic steel to be measured according to the following formula, indirectly achieving the optimal coercive force and meeting the product performance, and realizing the selection of the magnetic steel performance:
open-circuit magnetic flux Mx ═ (constant of digital fluxmeter) × (amount of change in magnetic flux) ÷ (number of turns of flux-measuring coil holder).
In a preferred mode of the above technical scheme, in the second step, the flux measuring coil clamp is formed by winding a copper wire, the inner diameter of the flux measuring coil clamp is 1mm larger than the outer diameter of the magnetic steel to be measured, and the height of the flux measuring coil clamp is 2mm higher than the height of the magnetic steel to be measured.
To above-mentioned technical scheme's preferred mode, survey magnetic flux coil anchor clamps include the wireframe, the wireframe is square tube type structure, wireframe axial cross-section is the U type structure of both ends toward turning out about, paste condenser paper on the U type structure surface of wireframe, the outside winding of condenser paper has the enameled wire, the enameled wire is formed to the upper and lower end of enameled wire lead-out wire.
Compared with the prior art, the invention has the advantages that:
1. according to the scheme, the open-circuit magnetic flux Mx of the magnetic steel is accurately measured, the high-performance magnetic steel with lasting magnetic force and strong magnetism is selected, the magnetic steel material with coercive force meeting the performance of the product is selected indirectly, the material quality of the part is well controlled from the source, the performance requirement of the product is met, the magnetizing frequency of a magnetoelectric system ammeter is reduced, the production efficiency is improved, the product quality is improved, and the product reliability is improved;
2. according to the scheme, the performance of the magnetic steel is determined by measuring the open-circuit magnetic flux Mx of the magnetic steel, the magnetic steel part is not required to be damaged, the integrity of the magnetic steel part is kept, the detection efficiency is improved, and the detection cost is reduced;
3. survey magnetic flux coil anchor clamps in this scheme directly adopt the copper line coiling to form, simple structure, it is convenient to make, low in manufacturing cost, convenient to use.
Drawings
FIG. 1 is a front view of the structure of a jig for measuring a magnetic flux coil according to the present invention;
FIG. 2 is a top view of the structure of the flux-measuring coil holder of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to fig. 1 and 2. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the method for detecting the performance of the magnetic steel, the magnetic steel used in the BD-1 galvanometer is taken as an example in the embodiment, the material of the magnetic steel BD2001 in the BD-1 galvanometer is LNGT32 AlNiCo, and the required coercive force Hc is not less than 79.6 KA/m.
The preferable method for the magnetic steel in the BD-1 galvanometer comprises the following steps:
the method comprises the following steps: and preliminarily selecting the magnetic steel to be measured. When the materials are selected preliminarily, the LNGT32 alnico with larger coercive force is selected to process the magnetic steel on the basis that the coercive force Hc is not less than 79.6KA/m, so that the primarily selected magnetic steel material meets the most basic requirements of product performance;
step two: manufacturing a flux measurement coil clamp according to the primarily selected magnetic steel to be measured, preferably, the flux measurement coil clamp is formed by winding S0.12 copper wires, so that the inner diameter of the flux measurement coil clamp is 1mm larger than the outer diameter of the magnetic steel to be measured, and the height of the flux measurement coil clamp is 2mm higher than the height of the magnetic steel to be measured; then recording the number of turns of the coil of the clamp; the specific structure of the magnetic flux measuring coil clamp in the embodiment is shown in fig. 1 and 2: the coil clamp for measuring magnetic flux comprises a wire frame 1, wherein the wire frame 1 is of a square-tube structure, the axial section of the wire frame 1 is of a U-shaped structure with the upper end and the lower end turned outwards, capacitor paper 2 is pasted on the outer surface of the U-shaped structure of the wire frame 1, an enameled wire 3 is wound outside the capacitor paper 2, and an enameled wire leading-out wire 4 is formed at the upper end and the lower end of the enameled wire 3; the capacitor paper 2 is sandwiched between the wire frame 1 and the enameled wire 3, and has an insulating effect on the two.
Step three: clamping the magnetic steel to be measured preliminarily selected in the step one between the pole palms of the magnetizer, and switching on a 180V direct-current power supply for magnetization;
step four: putting the magnetic steel to be measured after the magnetization in the third step into a magnetic flux measuring coil clamp;
step five: connecting two outgoing lines on the magnetic flux measuring coil clamp with a binding post of the digital magnetic flux meter, connecting 220V and 50Hz alternating current voltage to the digital magnetic flux meter, pressing a reset button of the digital magnetic flux meter to enable data displayed by the digital magnetic flux meter to be zero, moving out the magnetic steel to be measured from the magnetic flux measuring coil clamp, and obtaining the variable quantity of magnetic flux through data processing of the digital magnetic flux meter, wherein the variable quantity is directly displayed on the digital magnetic flux meter;
step six: calculating the open-circuit magnetic flux Mx of the magnetic steel to be measured according to the following formula:
open-circuit magnetic flux Mx ═ (constant of digital fluxmeter) × (amount of change in magnetic flux) ÷ (number of turns of flux-measuring coil holder).
The performance of the magnetic steel material is judged through the open-circuit magnetic flux Mx, so that the magnetic steel material with the optimized coercive force meeting the product performance is indirectly obtained, and the performance of the magnetic steel is selected.
According to the invention, the high-performance magnetic steel with lasting magnetic force and strong magnetism is preferably selected by measuring the open-circuit magnetic flux Mx of the magnetic steel, namely, under the condition that the magnet material is determined, the magnetic steel part is not damaged, the magnetic steel part with good performance is preferably selected by a method for detecting the open-circuit magnetic flux, the magnetic steel material with coercive force meeting the product performance is indirectly realized, the material quality of the part is well controlled from the source, the product performance requirement is met, the magnetizing frequency of a magnetoelectric system ammeter is reduced, the production efficiency is improved, the product quality is improved, and the product reliability is improved.
The above-mentioned embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and therefore, all equivalent changes made by the contents of the claims of the present invention should be included in the claims of the present invention.
Claims (3)
1. The magnetic steel performance detection method is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: preliminarily selecting magnetic steel to be measured;
step two: manufacturing a magnetic flux measuring coil clamp, and recording the number of turns of a coil of the clamp;
step three: clamping the magnetic steel to be measured preliminarily selected in the step one between the pole palms of the magnetizer, and switching on a 180V direct-current power supply for magnetization;
step four: putting the magnetic steel to be measured after the magnetization in the third step into a magnetic flux measuring coil clamp;
step five: connecting two outgoing lines on the magnetic flux measuring coil clamp with a binding post of the digital magnetic flowmeter, connecting 220V and 50Hz alternating current voltage to the digital magnetic flowmeter, pressing a reset button of the digital magnetic flowmeter to enable data displayed by the digital magnetic flowmeter to be zero, moving out the magnetic steel to be measured from the magnetic flux measuring coil clamp, and obtaining the variable quantity of magnetic flux through data processing by the digital magnetic flowmeter, wherein the variable quantity is directly displayed on the digital magnetic flowmeter;
step six: the open-circuit magnetic flux Mx of the magnetic steel to be measured is calculated according to the following formula, so that the coercive force is indirectly achieved to meet the requirement of the optimal magnetic steel material of the product performance, and the magnetic steel performance is selected and used:
open-circuit magnetic flux Mx ═ (constant of digital fluxmeter) × (amount of change in magnetic flux) ÷ (number of turns of flux-measuring coil holder).
2. The magnetic steel performance detection method according to claim 1, characterized in that: in the second step, the flux measuring coil clamp is formed by winding a copper wire, the inner diameter of the flux measuring coil clamp is 1mm larger than the outer diameter of the magnetic steel to be measured, and the height of the flux measuring coil clamp is 2mm higher than the height of the magnetic steel to be measured.
3. The magnetic steel performance detection method according to claim 2, characterized in that: survey magnetic flux coil anchor clamps and include wire frame (1), wire frame (1) are square barrel type structure, wire frame (1) axial cross-section is the U type structure of upper and lower both ends toward turning out, stick on the U type structure surface of wire frame (1) condenser paper (2), the outside winding of condenser paper (2) has enameled wire (3), enameled wire (3) upper and lower end forms enameled wire lead-out wire (4).
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