Numerical and Experimental Analysis of Iron Core Losses Under Various Frequencies

AC loss density component in electrical steel sheets

“…This assumption is consistent with the judgement that for low frequencies the sole loss mechanism dependent on excitation frequency is energy dissipation due to eddy currents generated in the conductive material in different time and spatial scales [24,[38][39][40][41][42][43][44][45][46]. The proposed expression can be derived as a specific case of the description advanced in [47].…”

A Fast-Converging Algorithm for the Efficiency Optimization of Vector Controlled Induction Motor Drives Based on a Hybrid Magnetic Flux Controller Architecture

“…Over heavy transient operation, the flux regulator activates the LMC in order to attain instant IM efficiency enhancement (Operating Mode 1 (OM 1)). The proposed LMC uses a preprogrammed, look-up table referencing profile of the magnetic flux, based on previous theoretical and experimental investigations on IM loss modeling [4], [5]. As IM flux reduction can substantially degrade dynamic performance and stability of the drive system, the proposed LMC is programmed to act in a conservative manner, involving small deviations of the motor performance.…”

“…The classical equivalent circuit of the IM considerably underestimates motor iron losses when the motor is fed by a voltage source PWM inverter [4]. Such a model deficiency can substantially affect the electromagnetic torque (T e ) estimation accuracy, leading to significant errors during IM output power calculation.…”

Hysteresis curves of a resistance spot welding transformer

“…A similar extension of the JA approach has been presented elsewhere . Most research papers on rate dependent extensions to the JA model are rooted within (Jiles, 1994), who presented a combination of the JA quasi-static model and Bertotti's theory (Philips et al, 1995;Benabou et al, 2004;Kís and Iványi, 2004;Chwastek, 2009;Rovolis et al, 2009). However, both "ingredients" of the hybrid approach have to be applied with care, thus the extended models are usually useful within a limited range of excitation frequencies.…”