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Epstein frame-based electrical sheet specific total loss measurement method

A technology with multiple Epstein squares and Epstein squares, applied in the direction of magnetic performance measurement, etc., can solve the problems of difficult equivalent magnetic circuit length, error, and uneven magnetic circuit.

Active Publication Date: 2013-06-12
BAODING TIANWEI BAOBIAN ELECTRICAL +2
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Problems solved by technology

[0002] The technical difficulty in measuring the total loss of electrical steel sheets is that the measured sample adopts a double-lapped structure to form a magnetic circuit, and the magnetic circuit of the lapped part is not uniform, so it is difficult to determine the equivalent magnetic circuit length
Although the 25cm Epstein square circle specified in the current standard can measure the specific total loss of the sample, but because its magnetic circuit length is specified as a fixed value of 0.94m, the specific total loss of the measured sample is not completely equal to the specific total loss of the uniform area of ​​the sample. loss, there is a certain error, and the uniform ratio of the total loss of the tested sample cannot be accurately obtained

Method used

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  • Epstein frame-based electrical sheet specific total loss measurement method
  • Epstein frame-based electrical sheet specific total loss measurement method
  • Epstein frame-based electrical sheet specific total loss measurement method

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Embodiment Construction

[0052] The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.

[0053] Based on the method of measuring the total loss of electrical steel sheets based on multiple Epstein square circles, three sizes of Epstein (Epstein) square circle models are used to measure the total loss of the same group of electrical steel sheet samples; according to the two-level weighted average The method is used to calculate the effective magnetic path length of two groups of Epstein square circles respectively, and finally obtain the corresponding different magnetic path lengths under different flux densities; at the same time, the calculation of the specific total loss is realized by using the two-level weighted average method, and the comparison The single Epstein square circle and the double Epstein square circle used in the background art are more accurate than the total loss measurement.

[0054] The Epstein square circles o...

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Abstract

The invention relates to an Epstein frame-based electrical sheet specific total loss measurement method, which belongs to the technical field of electromagnetic measurement. The technical scheme is as follows: three sizes of Epstein frame models are adopted to carry out the total loss measurement of the same group of measured electrical sheet samples; according to a secondary weighted average method, the effective magnetic path lengths of two groups of Epstein frames are calculated, and finally, different magnetic path lengths corresponding to different magnetic flux densities are obtained; and meanwhile, the secondary weighted average method is utilized to calculate specific total loss. The method has the advantages that: except for the measured electrical sheet samples, the material of other components is nonferromagnetic material, and therefore the affection of ferromagnetic material except for the test pieces on the measurement result is eliminated; and the method can be used for measuring the specific total loss of various brands of electrical sheets and analyzing the effective magnetic path lengths of Epstein frames and the loss of transformers and motors.

Description

technical field [0001] The invention relates to a method for measuring the specific total loss of electrical steel sheets based on multiple Epstein square circles, belonging to the technical field of electromagnetic measurement. Background technique [0002] The technical difficulty in measuring the specific total loss of electrical steel sheets is that the measured sample adopts a double-lapped structure to form a magnetic circuit, and the magnetic circuit of the lapped part is not uniform, so it is difficult to determine the equivalent magnetic circuit length. Although the 25cm Epstein square circle specified in the current standard can measure the specific total loss of the sample, but because its magnetic circuit length is specified as a fixed value of 0.94m, the specific total loss of the measured sample is not completely equal to the specific total loss of the uniform area of ​​the sample. Loss, there is a certain error, can not accurately get the uniform ratio of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/12
Inventor 范亚娜刘涛程志光王晓燕刘兰荣赵志刚
Owner BAODING TIANWEI BAOBIAN ELECTRICAL
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