This paper reviews electromagnetic water treatment, an alternative solution for scale control in industrial water processing, and a model device with solenoid coils inserted into a cylindrical kernel inside a pipe is analyzed for potential application at high water-flow capacity (few hundreds of m3/h). An efficiently strong magnetic field (e.g. with maximum magnetic flux density from 0.1 T to 0.2 T) can be produced using a DC electric supply resulting in total costs at least ten times lower than the expense of the scale-prevention ion exchange.
COBISS.SI-ID: 15254550
This paper presents a method for determination of the finite-element method model electrothermal parameters in a medium-voltage switchgear cell. The research includes a thermal calculation that is considered as a consequence of the eddy currents phenomena, which is a coupled numerical problem. Calibration of the numerical model is based on the multiobjective optimization procedure, which is carried out with the differential evolution algorithm (DE). The DE provides the best possible agreement of the measured temperature values on the test model and calculated values with the equivalent numerical model. The presented results are obtained for the linear and nonlinear case of eddy currents phenomena. The goal of the calibration is to determine the correct electrothermal parameters.
COBISS.SI-ID: 14929430
The magnetically nonlinear behavior of electric alternating current rotating machines is characterized by current dependent magnetic flux linkage characteristics. In this work, the impacts of iron core saturation, iron core saliency, permanent magnets, and squirrel cage in the rotor design on the machines' behavior, and the respective flux linkage characteristics in forms of hysteresis loops is analyzed. The analysis is based on experimental data by utilizing a stator with two phase-windings that produce magnetomotive forces displaced by electrical 90 degrees, enabling the direct evaluation of flux linkages by measurement of the windings' voltage and current on the machine terminals. Five rotors of different electromagnetic construction and manufactured from equal materials have been tested in combination with the afore mentioned stator. Thus, induction machines, synchronous reluctance machines, permanent-magnet synchronous machines, and their hybrid types are incorporated in the analysis. The work provides a deeper insight into the magnetically nonlinear behavior of the aforementioned machines, which is not available in the current literature.
COBISS.SI-ID: 67349761