CN-121978598-A - Measuring device for multi-angle oriented silicon steel sheet

Abstract

The invention discloses a measuring device for multi-angle oriented silicon steel sheets; the device comprises a rectangular magnetic ring serving as a main magnetic circuit and a rotatable laminated silicon steel sheet serving as a test sample, wherein alternating current voltage is applied to a primary side winding, current measurement of the primary side winding and induced voltage measurement of a secondary side winding are combined, and magnetic performance parameters of the oriented silicon steel sheet under different angles, such as magnetic induction intensity, magnetic field intensity, specific total loss, magnetic conductivity and the like, are calculated. According to the invention, the multi-angle measurement is realized by rotating the sample, repeated cutting of the sample is not needed, the measurement efficiency is obviously improved, the material loss is reduced, and the method is suitable for rapid and accurate performance evaluation of the motor iron core material.

Inventors

• GUO BAOCHENG
• JIANG QIAN
• ZHANG QI
• CHEN PEIWEN

Assignees

• 南京师范大学

Dates

Publication Date

20260505

Application Date

20260209

Claims (10)

1. 1. The measuring device for the multi-angle oriented silicon steel sheet is characterized by comprising a rectangular magnetic ring (1) serving as a main magnetic circuit, and is prepared by firstly cutting a silicon steel sheet mother plate into strips along a rolling direction, and then laminating the strips into the rectangular magnetic ring (1); Then cutting the lower side of the rectangular magnetic ring (1) to form a cylindrical laminated silicon steel sheet (4).
2. 2. The measuring device of multi-angle oriented silicon steel sheet according to claim 1, characterized in that in cutting the laminated silicon steel sheet (4), a cutting gap between the rectangular magnetic ring (1) and the laminated silicon steel sheet (4) is controlled to be 1mm.
3. 3. The measuring device of multi-angle oriented silicon steel sheet according to claim 2, characterized in that a secondary side winding (3) is installed at a cutting gap of the rectangular magnetic ring (1) and the laminated silicon steel sheet (4).
4. 4. A measuring device for multi-angle oriented silicon steel sheet according to claim 3, characterized in that the secondary side winding (3), i.e. the patch coil, is wound around the cut laminated silicon steel sheet (4).
5. 5. A measuring device for multi-angle oriented silicon steel sheet according to claim 3, characterized in that a primary side winding (2) is wound on the other side of the rectangular magnetic ring (1).
6. 6. The measuring device for multi-angle oriented silicon steel sheets according to claim 5, wherein a power supply and an ammeter are respectively connected to the primary winding (2), and a voltmeter is connected to the secondary winding (3).
7. 7. The measuring device for multi-angle oriented silicon steel sheets according to claim 5, wherein the primary side winding (2) is an insulated copper wire which is uniformly wound on the upper side of the rectangular magnetic ring (1), the number of turns wound is 40-80 turns, and the length wound on the rectangular magnetic ring (1) is equal to or more than 190mm.
8. 8. The measuring device of multi-angle oriented silicon steel sheet according to claim 1, characterized in that the effective length of the rectangular magnetic ring (1) is the length of the circumference of four corners plus the length of the rectangular frame.
9. 9. The method for measuring an induction voltage by using the measuring apparatus for multi-angle oriented silicon steel sheet as set forth in any one of claims 1 to 8, characterized by comprising the measuring steps of: The step (1) is to rotate the laminated silicon steel sheet (4) to the direction which is oriented with the rectangular magnetic ring (1), and the property of the material in the rolling direction is measured at the moment; The positive electrode and the negative electrode of the power supply are connected into a primary side winding (2) of the rectangular magnetic ring (1), the current input end of the digital power meter is connected with the primary side winding (2), and the voltage input end is connected with a secondary side winding (3); selecting proper magnetic induction intensity, wherein the interval is 0.1; calculating an effective value of the input voltage; The relation between the power input voltage U and the corresponding magnetic induction intensity B is shown in the formula (1): (1) Wherein U is an effective value of input voltage, f is an input power supply frequency, B is magnetic induction intensity to be measured, S is a cross-sectional area of a sample, N 2 is a number of turns of a secondary side coil, wherein the area of S is the cross-sectional area of a single side silicon steel sheet of the sample, namely the magnetic ring thickness is the magnetic ring width is the lamination coefficient, wherein the lamination coefficient is 0.85-0.95; the effective value of the magnetic field intensity in the step (4) is calculated by the effective value of the current measured by an effective value ammeter in a loop, and the effective value of the magnetic induction intensity is calculated by the formula (2): (2) Wherein Ĥ is an effective value of magnetic field intensity, N 1 is the number of turns of the primary side coil, Ȋ is a peak value of exciting current, and L m is an effective magnetic path length, wherein the effective length of the magnetic ring is the length of four corners circumference plus the length of a rectangular frame; Calculating the specific total loss, namely calculating the effective mass of the material when measuring the loss of the laminated silicon steel sheet (4), so as to obtain the specific total loss of the material, wherein the specific total loss can be calculated by the formula (4): (3) wherein P s is the specific total loss in the rolling direction, m e is the effective mass of the sample magnetic ring, and P c is the power meter measurement power; Measuring the magnetic properties of the laminated silicon steel sheet (4) at different angles, namely, after finishing the measurement of the rolling direction, namely, the rotation angle of the laminated silicon steel sheet (4), wherein the whole magnetic path is limited by the laminated silicon steel sheet (4) at the other orientation after rotation; step (7) of measuring the loss of the laminated oriented silicon steel sheet (4) at different angles, wherein the loss of the laminated silicon steel sheet (4) in the other orientation is calculated by the following formula because the measured loss is related to the overall effective mass: (4) Wherein P w is the total loss of the sample, P c is the power measured by the current power meter, P z is the total power measured in the rolling direction, m 1 is the effective mass of the rectangular magnetic ring (1), and m 2 is the effective mass of the laminated silicon steel sheet (4).
10. 10. The method according to claim 9, wherein the positive and negative connection directions in the step (2) are such that the voltage peak value, the current peak value and the power displayed by the digital power meter are positive.

Description

Measuring device for multi-angle oriented silicon steel sheet Technical Field The invention belongs to the technical field of motors, and particularly relates to a measuring device for multi-angle oriented silicon steel sheets. Background With the rapid development of motors, the market has higher requirements on the manufacture of high-efficiency motors, the oriented silicon steel sheets have excellent magnetic properties, the characteristics comprise low hysteresis loss, low eddy current loss and high saturation induction strength, the characteristics make the oriented silicon steel sheets ideal choices for manufacturing high-efficiency motors and transformers, however, after the oriented silicon steel sheets are prepared, accurate measurement is required to ensure that the oriented silicon steel sheets meet the performance requirements, at present, some traditional measurement methods such as an Epstein method and the like are widely used for measuring the performance of the oriented silicon steel sheets, mainly comprise the measurement of magnetic properties and the total loss, but the multi-angle oriented silicon steel sheet measurement often needs to be cut from different angles and put into a measuring device, the process is time-consuming and labor-consuming, the consumable is extremely large, and the limitations influence the performance of the motors taking the oriented silicon steel sheets as iron core materials in terms of production efficiency and performance optimization. Disclosure of Invention The invention aims to provide a measuring device for solving the problems of time consumption and labor consumption in measuring multi-angle oriented silicon steel sheets and realizing simple and rapid measurement of the properties of the oriented silicon steel sheets under different angles. The measuring device for the multi-angle orientation silicon steel sheet comprises a rectangular magnetic ring serving as a main magnetic circuit, and is prepared by firstly cutting a silicon steel sheet mother plate into strips along a rolling direction, and then laminating the strips into the rectangular magnetic ring; And then cutting the lower side of the manufactured rectangular magnetic ring to form a cylindrical laminated silicon steel sheet. Further, in cutting the laminated silicon steel sheet, a cutting gap between the rectangular magnetic ring and the laminated silicon steel sheet is controlled to be 1mm. Further, a secondary side winding is arranged at a cutting gap between the rectangular magnetic ring and the laminated silicon steel sheet. Further, the secondary winding is a patch coil, which is wound around the cut laminated silicon steel sheet. Further, a primary winding is wound on the other side of the rectangular magnetic ring. Further, a power supply and an ammeter are respectively connected to the primary winding, and a voltmeter is connected to the secondary winding. Further, the primary side winding is an insulated copper wire which is uniformly wound on the upper side of the rectangular magnetic ring, the number of winding turns is 40-80, and the length of the winding on the rectangular magnetic ring is more than or equal to 190mm. Further, the effective length of the rectangular magnetic ring is the length of the circumference of four corners plus the length of the rectangular frame. Further, the measuring method of the measuring device for the multi-angle oriented silicon steel sheet is used for measuring the induced voltage, and the measuring steps are as follows: Step (1) rotating the laminated silicon steel sheet to the direction which is oriented with the rectangular magnetic ring, and measuring the property of the material in the rolling direction at the moment; step (2), connecting the positive electrode and the negative electrode of the power supply to a primary side winding of the rectangular magnetic ring, connecting the current input end of the digital power meter to the primary side winding, and connecting the voltage input end of the digital power meter to a secondary side winding; selecting proper magnetic induction intensity, wherein the interval is 0.1; calculating an effective value of the input voltage; The relation between the power input voltage U and the corresponding magnetic induction intensity B is shown in the formula (1): (1) Wherein U is an effective value of input voltage, f is an input power supply frequency, B is magnetic induction intensity to be measured, S is a cross-sectional area of a sample, N 2 is a number of turns of a secondary side coil, wherein the area of S is the cross-sectional area of a single side silicon steel sheet of the sample, namely the magnetic ring thickness is the magnetic ring width is the lamination coefficient, wherein the lamination coefficient is 0.85-0.95; The effective value of the magnetic field intensity in the step (4) is calculated by the effective value of the current measured by an effective value ammeter in a loop, and the