On the Question of the Ratio of the Effectiveness of Magnetic and Magnetostrictive Mechanisms of EMA Transformation in Ferromagnets in a Normal Magnetizing Field

Abstract

In the process of designing EMA transducer, the most common approach is to take into account the Lorentzian or magnetostrictive mechanisms of the EMA transformation during calculations. In this article, two mechanisms of the EMA transformation arising from the excitation of ultrasonic vibrations in ferromagnets in a normal magnetizing field are considered in detail and experimentally investigated: magnetostrictive and magnetic based on ferromagnetic attraction. The efficiency of the EMA transformation for each mechanism was evaluated depending on the induction of magnetization. The ranges of values of the magnetic induction of magnetization are determined, at which the EMA transformation is most effective for each mechanism. The factors influencing the residual magnetization and internal stresses have been determined, which make it difficult to calculate the efficiency of EMA transducer and lead to a spread in the actual efficiency of EMA transducer designed using the calculation of the magnetostriction effect. In order to ensure high efficiency of the EMA transformation and good repeatability of its parameters, when designing EMA transducer, it is proposed to choose the value of the magnetization induction corresponding to the maximum efficiency of the magnetic mechanism of the EMA transformation

Please cite this article in English as:

Syrkin M.M., Shchipakov N.A. On the question of the ratio of the effectiveness of magnetic and magnetostrictive mechanisms of EMA transformation in ferromagnets in a normal magnetizing field. Herald of the Bauman Moscow State Technical University, Series Natural Sciences, 2024, no. 6 (117), pp. 36--54 (in Russ.). EDN: BAGUJF

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