This paper considers the design of an observer-based adaptive controller for variable speed threephase AC induction motors. The proposed controller allows for the simultaneous and independent control of the speed (torque) and the flux of the motor without requiring the measurement of the flux, and without the knowledge of the rotor resistance and the motor load. The control adaptively estimates...

This paper analyzed the effect of temperature on the permanent magnet flux and output torque. The major parameter which will impact the torque control accuracy of a surface mounted permanent magnet motor is the variation of the permanent magnet temperature. In addition, the temperature variation of the permanent magnet will also influence the maximum torque per ampere of the motor. To analyze t...

In this paper, a new type of axial gap motor, named the “flux-modulating hybrid-field consequent pole motor (FHCM)”, is proposed. To enable flux modulation, FHCM comprises rotor iron pieces sandwiched between two stators, armature, and field poles. The poles comprise permanent magnet poles, ring windings. magnetic can be adjusted by varying current. electromagnetic performance FHCM, including a...

there are several sources for pressure oscillations in solid propellant rocket motors. oscillatory flow field is one of them. free shear layers in motor flow field cause vortex shedding. end edges of propellant grains and baffle edge in two-segmented motors are samples of such zones. these vortices move from their forming points and strike the field walls. the kinetic energy of vortices change ...

This paper presents to obtain the state estimations in low speed induction motor using Sensorless Constant Switching Frequency Controller (CSFC) technique. The state estimations referred to flux and torque. Therefore the CSFC enabling Induction motor with Direct Torque Control is built using the MATLAB/SIMULINK. The switching frequency is maintained constant in order to improve its state estima...

Zusammenfassung Axialflussmaschinen eignen sich mit ihrer scheibenförmigen Bauweise gut dazu, eine hohe Drehmomentausbeute in Bezug auf das eingesetzte Aktivmaterial zu realisieren. Gleichzeitig erlaubt es der planare Aufbau, den Eisenkreis modular und möglichst einfach herstellbar gestalten. In diesem Beitrag wird Maschinenvariante vorgestellt, deren aus U‑Jochen UI-30-Kernblechen Steckspulen ...

Abstract These considerations illuminate an ontology of the witch by first disclosing how “witch,” as a linguistic gesture, carries world meaning, ethics, and culture being originating in body. Witches witchcraft speak to communal situatedness acknowledging power we have over ourselves, others, that singular lack control often experience everyday life. In dialogue with Ada Agada, Emmanuel Lévin...