Novel induction motor speed sensorless torque control optimizing both torque response and efficiency is proposed. The control is quite different than the conventional field-oriented or direct torque control [1]. First, the produced torque is explicitly continuous output variable of control. Second, a new rotor flux observer, which allows speed sensorless operation of IM by low and zero speed, w...

The aim of this paper is to present the structure of a new synchronous machine with stator ferrite permanent magnets and a salient passive rotor (a robust and low-cost technology) which, when supplied with current by a threephase bridge converter, produces continuous torque. This feature serves to place our machine on a par with the best synchronous machines available (e.g. high-energy rotor ma...

 Abstract: Local flux may be distorted in many regions of core, although total flux is usually sinusoidal. When attempting to predict the loss distribution in materials operating under localized distorted flux conditions, which occur in machines and transformer cores, it is essential that proper account of the waveform be taken. Moreover for development of new magnetic materials and generation ...

In order to expand the speed range for an indirect matrix converter–surface mounted permanent magnet synchronous motor drive (IMC-SPMSM), a wide operation control strategy based on flux-weakening and over-modulation method is proposed in this paper. stage of inverter, IMC designed, which increases fundamental voltage transmission ratio (VTR) 1. addition, considering variation limit boundary wit...

The present work studied the application of membrane bioreactor (MBR) for tapioca wastewater processing that contained chemical oxygen demand (COD) ranging from 4000-9000 mg/L. A preliminary study was initially conducted in order to evaluate membrane performance with respect to its flux with MLSS concentration ranging from 4,500 to 10,500 mg/L. It was clear that fouling was observed during the ...

and partly results of my Ph. D. student Richard Cleyton. It is a pleasure to thank the Erwin Schrrdinger Institute and the organisers of the program on Holonomy Groups in Diierential Geometry for their kind hospitality.

In this study, we model a sequence of confined and full eruption, employing the relaxed end state eruption kink-unstable flux rope as initial condition for ejective one. The coronal mass ejection, develops result converging motions imposed at photospheric boundary, which drive cancellation. process, parts positive negative external converge toward polarity inversion line, reconnect, cancel each...

This paper deals with the potentials of a Hybrid-Excitation Permanent-Magnet (HEPM) machine. The HEPM machine is characterized by rotor including both permanent magnets (PMs) and excitation coils. PMs produce constant flux at air gap machine, while an current supplied so as to regulate such flux. A increase could be necessary during transient overload operations, decrease useful Flux-Weakening ...