This paper presents a forward converter topology that employs a small resonant auxiliary circuit. The advantages of the proposed topology include soft switching in both the main and auxiliary switches, recovery of the leakage inductance energy, simplified power transformer achieving self-reset without using the conventional reset winding, simple gate drive and control circuit, etc. Steady-state...

A 3D computational electromagnetic-thermal coupled analysis was performed to analyze the effects of auxiliary cooling fans, called air-gap fans, on winding cooling in a large-capacity, high-speed induction motor. A novel non-uniform iron loss distribution mapping method considering time and rotation period was introduced to provide more accurate thermal modeling. Winding cooling performance in ...

Magnetic gear and magnetic-geared machine (MGM) are the potential solutions in electric vehicles (EVs) powertrains for inherent high efficiency mechanical simplification. However, torque density issue of MGM greatly limits its industrial application. To enhance performance MGM, a torque-enhanced with dual-series-winding design approach proposed. The key merits proposed to achieve space utilizat...

Abstract: A method for calibrating multi-decade inductive voltage dividers has been developed which makes it possible to determine both the inphase and the quadrature error for ratios of i /11, i = 1, 2, ..., 10 in the frequency range from 400 Hz to 5 kHz. Calibration is made by comparing the divider under test against a reference two-stage divider having a ratio winding with 11 identical secti...

power system overvoltages due to switching, lightning and other disturbances are the main problem for designers of the power transformers. once some frequencies of the incoming surges match with some of the natural frequencies of transformer winding, the resonance phenomenon is expected in transformer winding. the resonant overvoltages may destroy the insulation between turns and cause to insul...

This short note is a description of the analysis of single phase induction motors. It is intended to be read along with a description of the analysis of polyphase motors1.This will be called the ’reference document’. The style of analysis used here is described in more detail in that note and many of the elements of this analysis appear only in that other note. The single phase machine contempl...

We show that a class of exactly solvable quantum Ising models, including the transverse-field Ising model and anisotropic XY model, can be characterized as the loops in a two-dimensional auxiliary space. The transverse-field Ising model corresponds to a circle and the XY model corresponds to an ellipse, while other models yield cardioid, limacon, hypocycloid, and Lissajous curves etc. It is sho...

A boost Power Factor Correction (PFC) front end converter followed by a circulating current for the soft switching flows only through the auxiliary circuit and a In recent years, dc power supplies have been widely used in industrial Lr is delivered to the capacitor C1 via transformer T. iLr (t) decreases linearly. I believe that I understand how a starting capacitor is used with an induction mo...

Purpose – The aim of this paper is to optimize the capacitor value of a single phase open well submersible motor operating under extreme voltage conditions using fuzzy logic optimization technique and compared with no-load volt-ampere method. This is done by keeping the displacement angle (α) between main winding and auxiliary winding near 90, phase angle (φ) between the supply voltage and line...