We study single-texture collapse using a leapfrog discretization method on a 30X30X30 spatial lattice. We investigate the influence of boundary conditions, physical size of the lattice, type of space-time background (flat, i.e., nonexpanding, vs radiation-dominated and matter-dominated universes), and spatial distribution of the initial texture configuration on collapse time and critical windin...

Accurate model identification and fault detection are necessary for reliable motor control. Motor-characterizing parameters experience substantial changes due to aging, motor operating conditions, and faults. Consequently, motor parameters must be estimated accurately and reliably during operation. Based on enhancedmodel structures of electric motors that accommodate both normal and faulty mode...

A new permanent-magnet (PM) hybrid brushless (PMHB) machine is proposed and implemented as the integrated starter–generator (ISG) for hybrid electric vehicles (HEVs). It has the advantages of higher torque density than other PMHB machines and much wider speed range than other PM brushless machines. The key is to tune its dc-field winding current in such a way that three major modes of ISG syste...

We study radially symmetric solutions of a nonlinear elliptic partial differential equation in R with critical Sobolev growth, i.e., the nonlinearity is of exponential type. This problem arises from a wide variety of important areas in theoretical physics including superconductivity and cosmology. Our results lead to many interesting implications for the physical problems considered. For exampl...

In recent years, progress in power semiconductor switching devices has created more additional advantages that can be realized using multi-phase inverter-fed motors. The authors propose a MATRIX motor to realize electric motors with higher functionalities than conventional Since the is driven by H-bride inverters connected each phase winding, it high degree of freedom control. Moreover, these c...

As research into technology for autonomous vehicles becomes ever more intensive, the need redundant system designs, as a solution fail-operational functionality, has also increased. Redundant systems are those involved in maintaining normal operation even when one or components fails. In particular, electric power steering (EPS) systems, redundancy is achieved by applying dual-winding (DW), per...

Frequency response analysis (FRA) is a method which is used to detect mechanical faults in transformers. The FRA response of a transformer is determined by its geometry and material properties, and it can be considered as the transformer’s fingerprint. If there are any mechanical changes in the transformer, for example if the windings are moved or distorted, its fingerprint will also be changed...

The structure of an electric machine with a rotor, which has three degrees freedom rotation (EMTR) and consists external internal magnetic circuits, is considered. Between them, in the air gap spherical configuration, there m-phase winding control winding. excitation field EMTR carried out by means permanent magnets located on circuit. scope application EMTP systems stabilization, observation, ...

In order to adapt to the requirements of the development for precision agriculture technology, making the rice seed tape planting technology has been widely used. The paper-making improved the design on the rice seed tape twisting machine especially the seed tape winding units. It proposed seed tape winding automatic control system based on STC90C514AD to realize the rotating speed adjustment o...

The success of health monitoring and condition assessment of power transformers based on winding current signature analysis lies on proper extraction of features. The extraction of features in turn depends on appropriate signal processing methods. Fourier based signal analysis provides only frequency information and also suitable only for stationary signals. In this paper we present a combined ...