Overview of fast on-board integrated battery chargers for electric vehicles based on multiphase machines and power electronics

The study provides an extensive overview of on-board integrated chargers for electric vehicles that are based on multiphase (more than three phases) machines and power electronics. A common attribute of all discussed topologies is that they do not require a charger as a separate device since its role is transferred to the already existing drivetrain elements, predominantly a multiphase machine and an inverter. The study demonstrates how additional degrees of freedom that exist in multiphase systems can be conveniently utilised to achieve torque-free charging operation. Therefore, although three-phase (or multiphase) currents flow through machines' stator windings, they do not generate any torque; thus the machines do not have to be mechanically locked. Cost and weight saving is achieved in this way, while the available space is increased. For each topology operating principles are explained, and its control elaborated in detail for both charging and vehicle-to-grid mode. Finally, the validity of theoretical considerations and control algorithms of some of the existing charging solutions is experimentally verified and experimental performance of all discussed topologies is compared

Integrated motor drives: state of the art and future trends

With increased need for high power density, high efficiency and high temperature capabilities in Aerospace and Automotive applications, Integrated Motor Drives (IMD) offers a potential solution. However, close physical integration of the converter and the machine may also lead to an increase in components temperature. This requires careful mechanical, structural and thermal analysis; and design of the IMD system. This paper reviews existing IMD technologies and their thermal effects on the IMD system. The effects of the power electronics (PE) position on the IMD system and its respective thermal management concepts are also investigated. The challenges faced in designing and manufacturing of an IMD along with the mechanical and structural impacts of close physical integration is also discussed and potential solutions are provided. Potential converter topologies for an IMD like the Matrix converter, 2-level Bridge, 3-level NPC and Multiphase full bridge converters are also reviewed. Wide band gap devices like SiC and GaN and their packaging in power modules for IMDs are also discussed. Power modules components and packaging technologies are also presented

A922 Sequential measurement of 1 hour creatinine clearance (1-CRCL) in critically ill patients at risk of acute kidney injury (AKI)

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Integrated system for traction and battery charging of electric vehicles with universal interface to the power grid

This paper proposes an integrated system for traction and battery charging of electric vehicles (EVs) with universal interface to the power grid. In the proposed system, the power electronics converters comprising the traction drive system are also used for the battery charging system, reducing the required hardware, meaning the integrated characteristic of the system. Besides, this interface is universal, since it can be performed with the three main types of power grids, namely: (1) Single-phase AC power grids; (2) Three-phase AC power grids; (3) DC power grids. In these three types of interfaces with the power grid, as well as in the traction drive operation mode, bidirectional operation is possible, framing the integration of this system into an EV in the context of smart grids. Moreover, the proposed system endows an EV with an on-board fast battery charger, whose operation allows either fast or slow battery charging. The main contributes of the proposed system are detailed in the paper, and simulation results are presented in order to attain the feasibility of the proposed system.This work has been supported by COMPETE: POCI-01-0145-FEDER-007043 and FCT -Fundacao para a Ciencia e Tecnologia within the Project Scope: UID/CEC/00319/2013. This work has been supported by FCT within the Project Scope DAIPESEV - Development of Advanced Integrated Power Electronic Systems for Electric Vehicles: PTDC/EEI-EEE/30382/2017. Mr. Tiago Sousa is supported by the doctoral scholarship SFRH/BD/134353/2017 granted by the Portuguese FCT agency. This work is part of the FCT project 0302836 NORTE-01-0145-FEDER-030283

A strategic evaluation model for knowledge relationship among members in enterprise communities

With the development of online communities, there has been a dramatic increase in the number of members using Enterprise Communities (ECs) over the past few years. Many join ECs with the objective of sharing their knowledge on the specific issue and seeking relative knowledge from others. Despite the eagerness of sharing knowledge and receiving knowledge through ECs, there is no standard of assessing ones knowledge sharing capabilities and prospects of knowledge sharing in order to get great level of efficiency of knowledge sharing collaboration. This paper developed evaluation model to assess knowledge relationship behavior among ECs members with the aim of Vector Space Model

iran’s strategy in the struggle of regional and trans-regional powers for leadership in the regions of the Caspian sea and the Persian gulf

This article presents the causes and consequences of the involvement of trans-regional and non-regional states within the processes of the Caspian region and the Persian Gulf as the main part of the strategic energy ellipse put forward by Jeffrey Camp. The author presented his vision for the future of the region, taking into account the coming to power of a conservative president in Iran, disappointed in the lifting of US sanctions within the negotiations on the nuclear deal. Consequently, the orientation of the Iranian state to the East is strengthening; relations with Russia, China and neighboring countries are expanding.</jats:p

Integrated motor drive and non-isolated battery charger based on the split-phase PM motors for plug-in vehicles

A novel integrated motor drive and non-isolated battery charger based on a split-phase permanent magnet (PM) motor is presented and described for a plug-in vehicle. The motor windings are reconfigured by a relay for the traction and charging operation. In traction mode, the motor is like a normal three-phase motor, whereas in the charging mode, after windings reconnection, the system is a three-phase Boost rectifier. One important challenge to use the motor as three inductors in charger circuit is to have it in standstill during the battery charging. Based on the presented mathematical model of a split-phase PM motor, the zero-torque condition of the motor is explained which led to a proper windings reconnection for the charging. Simulation and experimental results of two separate practical systems are provided to verify the proposed integrated battery charger. Some practical limitations and design recommendations are provided to achieve a more realistic practical system

Comparing the effects of propofol and isoflurane on depth of anesthesia and blood loss during endoscopic sinus surgery

Background: Endoscopic sinus surgery (ESS) is one of the procedures which need a clear surgical field. The purpose of this study was to compare the effects of propofol and isoflurane on depth of anaesthesia and blood loss during ESS. Materials and Methods: In this clinical trial study, 52 (36 males and 16 females) ESS candidates referred to the Shafa hospital in Kerman. One group received propofol and another group isoflurane. Mean arterial blood pressure (MAP), depth of anaesthesia (DA) and total blood loss were recorded for patients in both groups. Results: DA was decreased in both groups, but no significant correlation was observed between the two groups in DA, MAP and blood loss. Moreover, no significant difference was observed between the two groups in total blood loss. Blood pressure was decreased in both groups during surgery. Conclusion: There is no significant difference between propofol and isoflurane in DA and decreasing blood loss during ESS. Therefore, we suggest the use of hypotensive anaesthetic agents during ESS