“…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].…”
Section: Critique Of Three-term Loss Separation Model Proposalsupporting
This article proposes a new approach to the loss separation issue. The conventional loss separation into three components is abandoned. The dependence of the dynamic component of loss density versus frequency is assumed to be a power law. The model is verified for selected samples of nonoriented and grain-oriented steel.
“…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].…”
Section: Critique Of Three-term Loss Separation Model Proposalsupporting
This article proposes a new approach to the loss separation issue. The conventional loss separation into three components is abandoned. The dependence of the dynamic component of loss density versus frequency is assumed to be a power law. The model is verified for selected samples of nonoriented and grain-oriented steel.
“…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.…”
Section: System Layout and Operationmentioning
confidence: 99%
“…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.…”
The paper introduces a magnetic flux control algorithm for the minimization of losses in Induction Motor (IM) drives. The proposed methodology accounts for search time delays and IM model deficiencies and has been applied to minimize power losses. The controller is validated on an IM prototype and offers improved transient response.
“…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.…”
PurposeThe aim of the paper is to provide a simple and reliable hysteresis model for prediction of magnetization curves of a resistance spot welding transformer (RSWT) core, operating in a wide range of flux densities and excitation frequencies.Design/methodology/approachThe hysteresis model considered in the paper is the T(x) description advanced by J. Takács. Three options to extend the model to the dynamic magnetization conditions are considered. The excitation conditions differ from those prescribed by international standards.FindingsThe quasi‐static Takács model combined with a fractional viscosity equation similar to that proposed by S.E. Zirka outperforms other considered options. The effect of eddy currents may be considered as a disturbance factor to the frequency‐independent quasi‐static hysteresis loop.Research limitations/implicationsThe combined approach yields in most cases a satisfactory agreement between theory and experiment. For highest frequency considered in the paper (1 kHz) excessive “heels” were observed in the modelled loops. This artifact may be reduced by the introduction of a more complicated relationship for the viscous term. Future work shall be devoted to this issue.Practical implicationsThe combined Takács‐Zirka model is a useful tool for prediction of magnetization curves of a RSWT core in a wide range of flux densities and excitation frequencies.Originality/valueThe usefulness of the Takács description has been verified in a practical application. The model is able to predict magnetization curves under non‐standard excitation conditions.
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