Efficiency Enhancement of Permanent-Magnet Synchronous Motor Drives by Online Loss Minimization Approaches

In this paper, a new loss minimization control algorithm for inverter-fed permanent-magnet synchronous motors (PMSMs), which allows for the reduction of the power losses of the electric drive without penalty on its dynamic performance, is analyzed, experimentally realized, and validated. In particular, after a brief recounting of two loss minimization control strategies, namely, the "search control" and the "loss-model control," both a new modified dynamic model of the PMSM (which takes into account the iron losses) and an innovative "loss-model" control strategy are presented. Experimental tests on a specific PMSM drive employing the proposed loss minimization algorithm have been performed…

Performance evaluation of a multisource renewable power converter prototype

Design of a solar-battery-thermoelectric power converter prototype

In this paper a multisource renewable energy system for high-current applications is proposed. The power architecture is based on a multi-input power converter including control and reconfiguration subsystems. Independently of the type of connected renewable sources, a proper control of the output DC voltage bus is provided as well as a proper control on the operating point of each renewable source to achieve the maximum power transfer. A 48V thermoelectric-photovoltaic-battery system in a three input configuration is designed. Three interacting feedback networks are implemented: the outer loop which controls the output voltage and as many inner loops as connected renewable sources to achie…

Remote diagnosis and control of wheelchair electrical drive systems

A new Diagnostic and Protective System (DPS) suitable for wheelchair electrical drive applications has been prepared. Such a system is able to perform both monitoring and long-distance transmission of key signals that are used as pre-fault and fault indicators. The system, moreover, may detect several anomalous working conditions by means of reliable diagnosis procedures and carries out actions to protect the electrical drive and to drive the disabled people in safe conditions. In particular the design, the realization and the performance analysis of the new dedicated diagnostic system, which exploits a programmable logic controller (PLC) as DRS hardware, are described and discussed. The ef…

TREAT-TO-TARGET NELLA MIOCARDITE DA M. DI KAWASAKI: DESCRIZIONE DI UN CASO CLINICO

Introduzione La Malattia di Kawasaki (MK) è una vasculite acuta sistemica dei vasi di medio calibro, con interesse elettivo per le arterie coronarie, auto-limitantesi. La diagnosi è clinica, complicanze cardiovascolari quali aneurismi delle coronarie, miocarditi, pericarditi, rappresentano la principale causa di morbilità. Materiali e Metodi R.C, 3.5 anni, giunge per febbre (T max 39°C), letargia, esantema peri-orbitale e alle estremità, iperemia congiuntivale, ritmo di galoppo e disfunzione ventricolare sn ( FE= 50%). Nel sospetto di MK, inizia terapia con IGIV 2gr/kg con scarso beneficio. Viene trasferito presso la TIP per miocardite acuta con insufficienza di pompa, anasarca, acidosi met…

Automotive Brushless Motor Powered by Fuel Cell

A Phase-Shift Full Bridge Converter for the Energy Management of Electrolyzer Systems

The purpose of this work has been the development of the supplying system for an industrial electrolyzer. The hydrogen generating device is part of a complex system constituted by a supplying photovoltaic plant, the grid and a fuel cell battery. The main aim of this electrical system is the hydrogen storage devoted to the suitable load supplying in order to obtain an optimum load profile in case of domestic consumers. The converter is linked to a maximum power point tracking (MPPT) algorithm which enables a converter to extract the maximum power from the photovoltaic plant. The energy is supplied to the electrolyzer or the storage system according to the load profile. A phase-shift control …

Analysis a DSP Implementation and Experimental Validation of a Loss Minimization Algorithm Applied to Permanent Magnet Synchronous Motor Drives

In this paper a new loss minimization control algorithm for inverter-fed permanent-magnet synchronous motors (PMSM), which allows to reduce the power losses of the electric drive without penalty on its dynamic performances, is analyzed, experimentally realized and validated. In particular, after a brief recall of two loss minimization control strategies (the "search control" and the "loss-model control"), both a modified dynamic model of the PMSM, which takes into account the iron losses, and a "loss-model" control strategy, are treated. Experimental tests on a specific PMSM drive employing the proposed loss minimization algorithm were performed aiming to validate the actual implementation.…

Efficiency Improvement of Inverter-Fed Permanent Magnet Synchronous Motors

In this paper a control algorithm for the efficiency improvement of inverter-fed permanent magnet synchronous motors (PMSMs) is presented. The proposed algorithm allows reducing the losses of the drive without reduction of its dynamic performances. In details, after recalling a dynamic model of the PMSM, which has been purposely modified and that takes into account the iron losses, the basic equations and the constraints to obtain the loss minimization are presented and discussed. Some simulations of a specific PMSM drive employing the proposed algorithm are performed. The results of these simulations show that the dynamic performances are maintained, and enhancement of the efficiency up to…

Test cycles for the characterization of electrical drives devoted to wheelchair applications

Today electrical wheelchairs are giving valuable increase of the quality of life of disabled people in developed countries. Despite the increasing diffusion of such an aid tool, specific standards for the characterization of their electric drives are not so developed as those available for urban electric vehicles. This paper presents a proposal for the test characterization of a wheelchair drive by means of test cycles with fixed speed trajectories. To this aim, the method, which is well known in the field of automobiles, has been purposely adapted and the obtained simulation results are satisfactory.