Partial Element Equivalent Circuit (PEEC) methods, for solving electromagnetic problem ,uses two discretizations, to volume cells for resistive-inductive partitions and to surface cells for capacitive partitions. Three-dimensional (3-D) problem geometry is partitioned to hexahedral volume cells. Around outer surface of these cells, with half-cell shift, surface cells will take place. When FastC...

In this paper a new optimization function for increasing the flux weakening range and output torque value of segmented interior permanent magnet synchronous motor (SIPMSM) is presented. In proposed objective function normalized characteristic current and saliency ratio are considered as two optimization variables during optimization process. The focus of this paper is rotor structure design suc...

A novel technique for the numerical extraction of equivalent circuits from physics-based device simulation is presented. The method is based on the partitioning of the device into functional regions, each corresponding to a circuit block. All the circuit elements have a clear physical interpretation. Element values are directly obtained from small-signal dc device simulation. The method generat...

Most textbooks on electric machines present a classical five-element constant impedance equivalent circuit for modeling polyphase induction machines operating under balanced polyphase sinusoidal steady-state conditions. Yet it is known for cage rotor machines that the rotor element impedances vary significantly with rotor j-equency. Research is in progress to determine a better ac equivalent ci...

This paper describes the results of a physically based time efficient method of simulating Sparameters of RF-High Electron Mobility Transistors (HEMTs) . In a frequency range from 2 GHz up to 120 GHz the simulated S-parameters show good agreement with the measurements obtained in the same frequency range. Using the two-dimensional device simulator MINIMOS-NT and a time domain method critical HE...

An attempt has been made to investigate the effect of SiO2 nanoparticles on the conductivity of polypyrrole conducting polymeric films prepared by an electrochemical method. The obtained nanocomposites were characterized by FTIR, cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). The results indicate that the conductivity of the nanoco...