According to star graph and winding distribution, MMFs of three kinds 12-slot/10-pole multi-phase multi-layer layout are analyzed by the improved function method. Analysis results show that can suppress even order (12n ± 1) harmonics, thereby reducing eddy-current loss in PMs. Based on unfolded LPMSM model, rotor MMF, air gap flux density, no-load back-EMF analytical permeance method, which is ...

The manufacturing of long lengths of Bi2Sr2CaCu2Ox (Bi2212) wire has led to the development of high-field magnets at low temperature. Both react-and-wind and wind-and-react manufacturing of magnets, however, have significant drawbacks that limit the performance of the conductor in magnet form. In this letter, an alternative approach to magnet manufacturing, react–wind–sinter, is proposed to avo...

The computation of two and three point functions in the Coulomb gas free field approach to string theory in the SL(2,R)/U(1) black hole background is reviewed. An interesting relation arises when comparing the results obtained using two different screening operators. The formalism is then modified to study string theory propagating in AdS3 which is considered as the direct product of the SL(2)/...

The aim of this paper is to develop an intelligent diagnosis method for fault detection and isolation in induction motors. We consider failures in three components of induction motor: bearing, stator winding and rotor winding. Firstly, a model-based nonlinear observer in the proposed method is designed based on available information. The fault detection decision is carried out by comparing the ...

We present a class of topological plasma configurations characterized by their toroidal and poloidal winding numbers, nt and np, respectively. The special case of nt=1 and np=1 corresponds to the Kamchatnov-Hopf soliton, a magnetic field configuration everywhere tangent to the fibers of a Hopf fibration so that the field lines are circular, linked exactly once, and form the surfaces of nested t...

The Hot Spot Temperature (HST) value depends on the ambient temperature, the rise in the top oil temperature (TOT) over the ambient temperature, and the rise in the winding HST over the top oil temperature. In this paper a new semi-physical model comprising of the environmental variables for the estimation of HST and loss of insulation life in transformer is proposed. The winding hot-spot tempe...

Using a general Green function formulation, we re-derive, both, (i) Spitzer and his followers results for the winding angle distribution of the planar Brownian motion, and (ii) Edwards-Prager-Frisch results on the statistical mechanics of a ring polymer entangled with a straight bar. In the statistical mechanics part, we consider both cases of quenched and annealed topology. Among new results, ...

This paper describes a quasi-fuzzy method of online stator-resistance estimation of an induction motor, where the resistance value is derived from stator-winding temperature estimation as a function of stator current and frequency through an approximate dynamic thermal model of the machine. The estimator has been designed and iterated by simulation study and then implemented by a digital signal...

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...

We investigate the inclusion of 10-dimensional string loop corrections to the entropy function of twocharge extremal small black holes of the heterotic string theory compactified on S1 × T 5 and show that the entropy is given by π √ a q1q2 + b q1 where q1 and q2 are the charges with q1 ≫ q2 ≫ 1 and a and b are constants. Incorporating certain multi-string states into the microstate counting, we...