Low-frequency behavior of laminated electric steel sheet: Investigation of ferromagnetic hysteresis loops and incremental permeability

Abstract

The frequency dependence of ferromagnetic hysteresis and the related core losses is still an open question. From scaling relations up to space discretized and simultaneous contributions resolutions, different levels of accuracy in the estimation of these losses can be reached. Below a given frequency known as the quasi-static threshold, it is well admitted that the hysteresis cycle remains unchanged. A precise evaluation of this threshold is fundamental to simulate and evaluate precisely the magnetization behaviors under higher frequencies. But this estimation is complex, especially through the unique observation of the hysteresis cycles and because of instrumentation limitations. In this manuscript, we propose an alternative and simple method to precisely refine this threshold's estimation. By using an alternative magnetic signature known as the magnetic incremental permeability butterfly loop ( ( )), improvements are proposed in observing the very low-frequency magnetization behaviors and assessing the quasi-static threshold. This work constitutes a leap forward in understanding the magnetic low-frequency behaviors of laminated electric steel sheets.

A universal method based on fractional derivatives for modeling magnetic losses under alternating and rotational magnetization conditions

“…While methods have been proposed for modeling this phenomenon, the resulting models have been rarely validated based on experimental data [41][42]. Past studies have demonstrated that increasing the 𝐻 contribution incrementally during MIP signature measurements while monitoring the eddy current testing (ECT) coil impedance used for implementing the 𝐻 contribution is a good indirect means of observing the accommodation phenomenon [43]. However, the extension of the DF model to account for accommodation phenomena is not explicitly treated in the present study owing to space restrictions.…”

Stress and Microstructures Characterization Based on Magnetic Incremental Permeability and Magnetic Barkhausen Noise Techniques

“…A. N. Stashkov regarded MIP as indicator of compression stress in low-carbon steel [ 6 ]. Benjamin Ducharne characterized the stress changes in iron–cobalt magnetic sheet based on MIP [ 7 ]. Tetsuya Uchimoto evaluated the creep-induced microstructural changes in 12Cr-Mo-V-W microstructure under different creep test conditions by using the MIP method [ 8 , 9 ].…”

Comprehensive assessment of the quality of laminated core of electrical machines by the high-frequency induction-vibration method

“…Питомі втрати у магнітопроводі є важливим показником. Зростання магнітних втрат обумовлено насамперед зростанням паразитних вихрових струмів внаслідок порушення міжлистової ізоляції, ослаблення пресування викликає такі негативні явища як підвищення вібрацій окремих вузлів та машини загалом [4,5].…”