机械应力下无取向电工钢片磁致伸缩特性研究

doi:10.19595/j.cnki.1000-6753.tces.230165

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Abstract The magnetostrictive phenomenon of electrical steel sheet is one of the main causes of vibration and noise of motor and transformer core. The processing technology for the cores, such as cutting, stamping, assembly etc., will produce residual stress in the electrical steel sheet, then changing the magnetostrictive characteristic of electrical steel sheet and increasing vibration and noise of core.
The external stress can affect the magnetostriction of non-oriented electrical steel sheet. In this paper, it is shown that the curves of the principal strain of the elongation of the non-oriented electrical steel sheet with the peak values of the magnetic flux density during the change of the applied stress from -8 MPa to 8 MPa are given. Under the same magnetic flux density, compared with the curve without external stress, the applied pressure will increase the magnetostriction, and the external tension will decrease the magnetostriction. From the perspective of microscopic mechanism, when the tensile stress and compressive stress act on the electrical steel sheet, the mechanical stress will change the structure of the magnetic domain, which will affect the magnetization process, and then affect the magnetostriction. The reasons for this influence are also analyzed in this paper. In addition, under the same applied stress, the magnetostriction will increase with the increase of magnetic induction intensity.
Different cutting methods will affect the magnetostrictive characteristics of non-oriented electrical steel sheet. In this paper, the magnetostrictive loops are studied under three cutting methods when the samples are magnetized in the rolling direction. It can be seen that the magnetostrictive peak value of laser cutting sample in the same situation is obviously larger than that of hydraulic shearing machine and line cutting method, its peak value of strain is about 2 times that of hydraulic cutting and line cutting method. When the same compressive stress is applied to the samples of the three cutting methods, the magnetostrictive peak value increases, and the sample cut by the hydraulic shearing machine increases the maximum magnetostrictive peak value.
To further study the residual stress left in the sample by three cutting methods, the variation curves of the magnetostrictive peak value with stress before and after annealing of electrical steel sheet before and after annealing are measured under different cutting methods. After annealing the magnetostrictive peak value of electrical steel sheet is less than before annealing. Annealing treatment can not only improve the purity of steel, change the grain size, but also play an important role in the improvement of magnetostrictive property of electrical steel sheet. In addition, the residual stress in the measured sample can be indirectly analyzed by the relation curve between the peak value of magnetostrictive peak and stress before and after annealing. After analysis, it is concluded that in the three cutting methods, the residual stress generated by laser cutting is the largest, it can be seen that although laser cutting has a high cutting precision, it will produce a large residual stress. Therefore, in terms of improving equipment performance or reducing noise, it is necessary to choose the cutting method. In order to analysis the magnetostriction of motor stator core, the magnetostrictive characteristic curve of electrical steel sheet was obtained by using the above experimental measurements, the magnetostrictive effect of a permanent magnet motor core is simulated and calculated. The deformation of iron core with and without external stress is compared and analyzed. The simulation results indicate that the application of stress leads to an increase in deformation of the stator core in a permanent magnet motor.
The research indicates that compression stress exacerbates the magnetostrictive effect of electrical steel sheets, while laser cutting generates more residual stress and amplifies motor vibration. This study provides a scientific foundation for further analysis of iron core vibration and noise.

Key words： Magnetostriction annealing stress cutting pattern

Received: 11 February 2023

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TM275

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	Wang Zhen
	Zhang Yanli
	Gong Yuan
	Zhang Dianhai
	Xie Dexin

Cite this article:

Wang Zhen,Zhang Yanli,Gong Yuan等. Study on Magnetostrictive Properties of Non-Oriented Electrical Steel Sheet under Mechanical Stress[J]. Transactions of China Electrotechnical Society, 2023, 38(21): 5682-5690.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.230165 OR https://dgjsxb.ces-transaction.com/EN/Y2023/V38/I21/5682

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