Nagoya Institute of Technology

About: Nagoya Institute of Technology is a education organization based out in Nagoya, Japan. It is known for research contribution in the topics: Thin film & Turbulence. The organization has 10766 authors who have published 19140 publications receiving 255696 citations. The organization is also known as: Nagoya Kōgyō Daigaku & Nitech.

Design study and experimental analysis of wound field flux switching motor for HEV applications

Abstract: This paper presents design study, optimization and performance analysis of wound field flux switching machine with non-rare-earth magnet for hybrid electric vehicle drive applications. The stator of proposed machine consists of iron core made of electromagnetic steels, armature coils and field excitation coils as the only field mmf source. The rotor is composed of only stack of iron and hence, it is robust and suitable for high speed operation. The design target is a machine with the maximum torque and power density, and the maximum speed more than 210Nm and 3.5kW/kg, and 20,000r/min, respectively, which competes with interior permanent magnet synchronous machine used in an existing hybrid electric vehicle. Deterministic optimization method is applied to design the proposed machine until the target performances are achieved. Some experimental studies using a prototype of the finally designed machine are demonstrated to validate the effectiveness of the proposed machine.

Structural changes of water in the Schiff base region of bacteriorhodopsin: proposal of a hydration switch model.

Abstract: In a light-driven proton-pump protein, bacteriorhodopsin (BR), three water molecules participate in a pentagonal cluster that stabilizes an electric quadrupole buried inside the protein. In low-temperature Fourier transform infrared (FTIR) K minus BR spectra, the frequencies of water bands suggest extremely strong hydrogen bonding conditions in BR. The three observed water O−D stretches, at 2323, 2292, and 2171 cm-1, are probably associated with water that interacts with the negative charges in the Schiff base region. Retinal isomerization weakens these hydrogen bonds in the K intermediate, but not in the later intermediates such as L, M, and N. In these states, spectral changes of water bands appeared only in the >2500 cm-1 region, which correspond to weak hydrogen bonds. This observation suggests that after the K state the water molecules in the Schiff base region find a hydrogen bonding acceptor. We propose here a model for the mechanism of proton transfer from the Schiff base to Asp85. In the “hydrati...

Optimal design of robust vibration suppression controller using genetic algorithms

Abstract: This paper presents an evolutional compensator design for motion control systems using genetic algorithms (GAs). The control system is composed of a robust two-degrees-of-freedom (2DOF) compensator based on the coprime factorization description. A feedback compensator in the 2DOF control system is theoretically designed under the /spl mu/-Synthesis framework to ensure the robust stability because the real plant mechanism includes structured uncertainties, e.g., the frequency perturbations of vibration modes. On the other hand, a feedforward compensator is optimized by GA paying attention to the robust servo characteristics against the mechanical parameter variations, where the structuring and parameterization of the compensator can be autonomously achieved to satisfy the desired servo characteristic with the resonant vibration suppression performance. The effectiveness of the proposed controller design has been verified by experiments using a prototype.

Design Optimization and Performance of a Novel 6-Slot 5-Pole PMFSM with Hybrid Excitation for Hybrid Electric Vehicle

Abstract: With growing concerns over our environment, more and more people in automakers, governments and customers think that the electric drive becomes more attractive research. Since electric motors play an important role in both EVs and HEVs, it is a pressing need for researchers to develop advanced electric machines. As one of the candidates, permanent magnet flux switching machine (PMFSM) with additional coil excitation has several attractive features compared to interior permanent magnet synchronous machines (IPMSM) conventionally employed in HEV. The variable flux control capability and robust rotor structure make this machine becoming more attractive to apply for high speed motor drive system coupled with reduction gear. This paper presents an investigation into design possibility of 6-slot 5-pole PMFSM with hybrid excitation for traction drives in HEVs. An improved design is examined to gain a better performance in its maximum torque and power production. The final designed machine enables to keep much power density compared to existing IPMSM installed on the commercial SUV-HEV.

Intercomparison of induced fields in Japanese male model for ELF magnetic field exposures: effect of different computational methods and codes.

Abstract: The present study provides an intercomparison of the induced quantities in a human model for uniform magnetic field exposures at extremely low frequency. A total of six research groups have cooperated in this joint intercomparison study. The computational conditions and numeric human phantom including the conductivity of tissue were set identically to focus on the uncertainty in computed fields. Differences in the maximal and 99th percentile value of the in situ electric field were less than 30 and 10 % except for the results of one group. Differences in the current density averaged over 1 cm(2) of the central nerve tissue are 10 % or less except for the results of one group. This comparison suggests that the computational uncertainty of the in situ electric field/current density due to different methods and coding is smaller than that caused by different human phantoms and the conductivitys of tissue, which was reported in a previous study.