Search

A helium cooled liquid lithium (or lead lithium) concept has been developed to design a liquid breeder blanket in South Korea. Ferritic–martensitic steel (FMS) was selected as a structural material for fusion reactors, and a commercial-scale advanced reduced-activation alloy (ARAA) has been developed. An experimental loop for a liquid breeder (ELLI), which we designed and fabricated ourselves, was constructed to validate the electromagnetic (EM) pump as well as to test the effects of the magnetohydrodynamics of a liquid metal flow, and to investigate the compatibility of PbLi with the structural materials of FMS. Thus far, performance tests on each component, such as the heaters and control systems used for heating the loop, were conducted, and characteristic tests using a magnet and an EM pump were carried out. Corrosion tests using ELLI were conducted using grade 91 FMS steel and ARAA for a 250-h period (150+100 h). In this paper, a commercial FMS with grade 91 and developed ARAA were used for corrosion test specimens to compare the corrosion characteristics in the flowing PbLi loop. A corrosion test was conducted for investigating the compatibility of PbLi using structural materials. The effects of the oxide coatings on the prevention of the corrosion progress were also investigated. [ABSTRACT FROM AUTHOR]

Flexible Si nanomembrane transistors with Al2O3 and SiO2 gate dielectrics were fabricated, and their mechanical stability was compared under various bending conditions. Both the Al2O3 and SiO2 gate dielectric devices exhibited good charge transport properties, which was associated with the advantage of having a fully depleted mode in the MOSFET operation. The results of the comparison showed that the Al2O3 gate dielectric device degraded to a greater extent than the SiO2 gate dielectric device under the same bending condition. The greater degradation in the Al2O3 gate dielectric device was attributed to the higher Young’s modulus of the Al2O3, which put more strain on the Al2O3 under the same bending condition. [ABSTRACT FROM AUTHOR]

In-wheel motors bring a fundamental change in electric vehicle technology by removing conventional mechanical components and freeing up space inside the vehicle body. This approach ultimately helps to realize all-wheel independent control for improved vehicle dynamics and increased vehicle design freedom. However, when space allowed for an in-wheel motor is taken into consideration, high torque density, high efficiency, and wide-speed-range capability are typically required. This paper specifically investigates a 20-pole–24-slot surface permanent magnet synchronous motor with consequent pole rotor for in-wheel direct drive since this topology is well suited for high-pole motors and thus high-torque direct-drive applications. Extensive finite-element analysis is carried out to characterize the proposed motor, and the practical feasibility of the proposed motor is discussed. Finally, the validity of the analysis was experimentally verified. [ABSTRACT FROM AUTHOR]

This paper deals with the analysis techniques of a high speed and high efficiency 10 kW, 30 000 rpm rated induction motor. The induction motor has been analyzed by the time-varying magnetic finite element method and the test results show that there is a possibility that the motor could be used in a high speed spindle system application. All performances of the prototype are successfully verified. All analysis techniques are introduced to develop a high speed and high efficiency induction motor made by copper die casting. The analysis techniques are composed of magnetic analysis, structural analysis, critical speed analysis, unbalance response analysis and computational fluid dynamics (CFD). CFD simulation results are compared with the experiment, and are within a 5% deviation. [ABSTRACT FROM AUTHOR]

This paper deals with the analysis techniques of a high speed and high efficiency 10 kW, 30,000 rpm rated induction motor. The induction motor has been analyzed by time-varying magnetic finite element method and the test results show that there is a possibility that the motor could be used in a high speed spindle system application. All analysis techniques are introduced to develop a high speed and high efficiency induction motor made by copper die casting. The analysis techniques are composed of magnetic analysis considering losses and input current (PWM and sinusoidal), structural analysis of rotor and stator, 3-D rotordynamic analysis and 3-D CFD. All performances of the prototype are successfully verified. [ABSTRACT FROM AUTHOR]

Corrections were made to the paper, "Development of a 20-pole-24-slot SPMSM with consequent pole rotor for in-wheel direct drive,"(Chung,S.-U., et a), IEEE Trans. Ind. Electron., vol. 63, no. 1, pp. 302-309, Jan. 2016. [ABSTRACT FROM PUBLISHER]