45 research outputs found

    Design Optimization of a Very High Power Density Motor with a Reluctance Rotor and a Modular Stator Having PMs and Toroidal Windings

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    This paper proposes a new high power density permanent magnet (PM) motor design for traction applications to achieve the 50kW/L target set by the US Department of Energy by increasing the torque capability and operating speed compared to conventional PM machine topologies. A large-scale multi-objective design optimization based on 2D finite element analysis (FEA) and differential evolution algorithm was conducted to achieve the best trade-off among high efficiency, high power density and high power factor. The torque-speed envelopes are also checked for the Pareto front designs to make sure they have a constant power speed ratio of at least 3:1. An open frame lab prototype (OFLP) motor has been fabricated and tested to validate the principle of operation and design optimization approach, and to identify the potential challenges in manufacturing and testing. Ongoing work on further pushing the electromagnetic performance to the limit and improving the manufacturing and cooling techniques are also discussed

    A facile microwave assisted synthesis of flavones

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    1311-1314Chalcones 3a-f on irradiation under microwave in DMSO in presence of catalytic amount of I2 provides flavones 4a-f in high yield. The corresponding chalcones 3a-f are obtained by Claisen-Schimdt condensation of aromatic aldehydes with o-hydroxy acetophenon

    From fly development to evolution

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