1,722,736 research outputs found
Experimental Characterization of a Belt-Driven Multi-Phase Induction Machine for 48 V Automotive Applications: Losses and Temperatures Assessments
No full text[134] A. Cavagnino, A. Tenconi, S. Vaschetto, "Experimental Characterization of a Belt-Driven Multi-Phase Induction Machine for 48 V Automotive Applications: Losses and Temperatures Assessments", Conf. Rec. , , ISBN: , 2014, pp. 1165-117
PM fractional machines adopting bonded magnets: effect of different magnetizations on the energetic performance
Full text linkThe adoption of Permanent Magnets in small brushless machines for automotive applications is becoming frequent. Some research on bonded magnets is being carried on to substitute the ferrites. In the paper the parallel and radial magnetizations are considered: the different process complexity levels are analyzed and the effects on the iron losses and the energetic performances are evaluated by means of a simulation analysis and its experimental validatio
Evaluation of the magnetization direction effects on ferrite PM brushless fractional machines
Full text linkPermanent magnets are frequently adopted in small brushless machines for automotive applications. Normally anisotropic ferrites, but some research on bonded magnets is being carried on. Several types of magnetization can be proposed, involving different levels of complexity in the magnetization process. In the paper a comparison between parallel and radial magnetization is described, taking into account on one side the major complexity of the radial process and on the other the small power derating of the paralle
Direct torque control for dual three-phase induction motor drives
Full text linkA direct torque control (DTC) strategy for dual three-phase induction motor drives is discussed in this paper. The induction machine has two sets of stator three-phase windings spatially shifted by 30 electrical degrees. The DTC strategy is based on a predictive algorithm and is implemented in a synchronous reference frame aligned with the machine stator flux vector. The advantages of the discussed control strategy are constant inverter switching frequency, good transient and steady-state performance, and low distortion of machine currents with respect to direct self-control (DSC) and other DTC schemes with variable switching frequency. Experimental results are presented for a 10-kW DTC dual three-phase induction motor drive prototype
New Stationary Frame Control Scheme for Three Phase PWM Rectifiers Under Unbalanced Voltage Dips Conditions
Full text linkA new stationary frame control scheme for three-phase pulsewidth-modulation (PWM) rectifiers operating under unbalanced voltage dips conditions is proposed in this paper. The proposed control scheme regulates the instantaneous active power at the converter poles to minimize the harmonics of the input currents and the output voltage ripple. This paper's novelty is the development of a new current-reference generator implemented directly in stationary reference frame. This allows using proportional sinusoidal signal integrator (P-SSI) controllers for simultaneous compensation of both positive and negative current sequence components. No phase-locked loop (PLL) strategies and coordinate transformations are needed for the proposed current-reference generator. Experimental results are presented for a 20-kV A alternative current (ac)/direct current (dc) converter prototype to demonstrate the effectiveness of the proposed control scheme. A comparison with two other existing control techniques is also performed. Fast dynamic performance with small dc-link voltage ripple and input sinusoidal currents are obtained with this control scheme, even under severe voltage dips operating condition
Alle origini della Tecnologia dell'architettura
No full textIl saggio riscopre le origini della Tecnologia dell'architettura, uno dei pilastri conoscitivi su cui si basa, ancora attualmente, la formazione degli architetti. Esaminando le principali tappe di maturazione dell'insegnamento in un ambito culturale caratteristico - quello del Politecnico di Milano durante le contestazioni studentesche degli anni '60 - emergono le implicazioni ideologiche attinenti il rapporto tra cultura tecnica e architettura
Piranesi, ancora lui
No full textsegnalazione della mostra sull'opera grafica di Giovanni Battista Piranesi al Max Museo di Chiass
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