1,721,004 research outputs found
Hairpin-Wound Rim-Driven Propeller for Electric Boats on Inland Waterways
No full textElectric mobility on water is in the early stage of development but has a great potential, especially when considering inland waterway vessels. Inland waterway vessels are the best candidate to benefit from a battery electric propulsion system, since they typically operate in environments with restrictions on noise and emissions; they have short ranges and are relatively close to charging infrastructures. Rim-driven propellers actuated by large diameter hollow-shaft electrical machines are a promising technology. Rim-driven propellers present a number of advantages when compared to standard propellers, such as increased efficiency and a compact structure that is particularly suitable for small and lightweight boats. The present work details the design and numerical simulation of the electric machine for rim-driven propeller pod applied to a speedboat to be used on lakes and rivers. The electric machine main distinctive features are a high power density, a thin radial section and a hairpin winding construction
Assessment of a Multi-Functional Converter System for Traction Electric Drives
No full textThe introduction of strict regulations in terms of air pollution is pushing automotive industry and heavy equipments vehicles manufacturers to integrate electric drives into the powertrain. To overcome the limitations on maximum battery voltage, a DC-DC bidirectional boost converter stage between the battery and the inverter is widely adopted by manufacturers. However, these converters are bulky, expensive and impact on the system efficiency. For this reason, Multi-Functional Converter Systems (MFCS) have been introduced in order to avoid the voltage boost stage and take advantage of the electric motor and the inverter to integrate the boost converter within these two components. This paper carries out a comparison between a traditional architecture, with a DC-DC boost converter stage, and a MFCS, to determine the best solution in terms of efficiency, weight and encumbrance
Wide Voltage Range Dual Active Bridge PV Retrofit Storage System
No full textThis paper presents a storage system integration on the photovoltaic module side of a traditional grid-connected PV plant. The proposed retrofit application is based on a wide voltage range Dual Active Bridge topology, used as bidirectional DC/DC converter. Wide voltage operation capability at PV side is required to allow the integration of the retrofit storage system on a broader range of existing PV plants, characterized by different PV string operating voltage and commercial grid-connected inverters. Dual Active Bridge topology was chosen as a galvanically-insulated bidirectional single stage conversion stage to interface storage batteries to the PV side of the existing photovoltaic plant. The storage battery is charged during the overproduction of the PV plant and the storage system sustains the end-user domestic loads when solar irradiation is insufficient. The proper operation of the commercial inverter, the design and control strategy of the whole system showed the effectiveness of the proposed solution. A full-size 3.2kW converter prototype was manufactured and experimental validation was carried out
Modular Multi-Three-Phase Electric Drives for Enhanced Reliability and Current Ripple Minimization
No full textAutomated Bearing Fault Detection via Long Short-Term Memory Networks
No full textThis paper presents a method for automated bearing fault detection via motor current analysis using Long Short-Term Memory networks. Minimal pre-processing is applied to current signals. The proposed approach is experimentally validated on a laboratory trial comprising different test sets for condition monitoring and fault diagnosis of a 6-poles induction motor. Preliminary results confirmed the effectiveness of the proposed method to detect various bearing faults under different operating conditions, such as: shaft radial load and output torque
Design and Optimization of a Magnetic Gear for a Conveyor System Application
No full textMagnetic gears have some advantages when compared to the traditional mechanical ones, especially in terms of maintenance and absence of lubrication. Many types of magnetic gears have been presented in the last years, with the aim of pushing the torque density to very high levels.This paper deals with the design and optimization of a magnetic gear (MG) for an industrial conveyor system. The design was carried out considering the geometrical constraints and the gear ratio imposed by the target application, with the aim of reducing the torque ripple and obtaining a balanced radial attraction force on the segmented ring. Two different internal permanent magnet inner rotor geometries were drafted and optimized by means of finite element simulations. The different designs were compared against each other by means of different figures of merit, including torque ripple, radial force on the segmented ring, power losses and mass of the permanent magnets
Small Footprint Inductive Power Transfer Based on Split-Transformer: Design and Experimental Validation
No full textAssessment of master-slave and droop control strategies in multi-three-phase drives
No full textMulti-phase electric drives can be employed in a great variety of applications. Their advantage in terms of fault-tolerance capability is becoming the focus of the work of many research activities, especially in the field of transportation electrification. The main topic is to create redundant and modular multi-three-phase drives to increase the overall system reliability and fault-tolerance. To this aim, distributed control architectures have been assessed. In this paper, a centralized master-slave control is compared against a distributed droop control architecture, in order to identify advantages and drawbacks. Both of the control strategies are applied to a double three-phase drive. The aim of the work is to assess whether the droop control architecture can be a valid alternative to a centralized master-slave control in terms of performances, but with the additional benefit of having a proper full redundant fault-tolerant application
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