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Due to the continuing progress in power electronics technologies, a drive frequency of electrical machine such as a reactor and a transformer can be changed arbitrarily. Consequently, it is expected that a reactor or a transformer is downsized by higher frequency for saving space. When these electrical machines which have iron core are driven by high frequency, the iron losses of iron core increase...
We are developing quasi-optical superconducting hot-electron bolometer (HEB) mixer receivers for astronomical and atmospheric remote sensing applications. The microbridge of the HEB mixer was fabricated at room temperature from a 6.8-nm-thick niobium titanium nitride (NbTiN) film deposited on a 20-nm-thick aluminum nitride (AlN) buffer layer, using a helicon sputtering technique at a slow deposition...
This paper presents a new approach to predict the equivalent circuit parameters of induction motors. When the proposed method is employed, all electrical induction motor circuit parameters can be determined by a simple standstill test using a voltage-source PWM inverter. Moreover, the proposed method can measure not only the rotor circuit parameters varying with slip frequency but also the magnetizing...
This paper evaluates the actual power consumption and the total energy for scientific floating-point computations accelerated by FPGA-based custom computing machines. With our FPGA-based machines: the streaming accelerator for computational fluid dynamics and the programmable systolic-array processor for numerical simulations based on difference schemes, we measure the power of the entire systems...
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