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Hiroaki Ishizuka,Yukitoshi Motome 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
A numerical investigation on the thermodynamic properties of an Ising spin Kondo lattice modelon a kagome lattice is reported. By using a Monte Carlo simulation, we investigated the magneticphases at 1/3 filling. We identified two successive transitions from a high-temperature paramagneticstate to a Kosterlitz-Thouless-like phase in an intermediate temperature range and to a partiallydisordered phase at lower temperatures. The partially disordered state was characterized by the coexistenceof antiferromagnetic hexagons and paramagnetic sites with period p3×p3. We comparedthe results with those for the model on a triangular lattice.
Study of Winding Method to Reduce Stray Loss and Stator Core Vibration of Synchronous Machine
Hiramatsu, Daisuke,Sutrisna, Kadek Fendy,Ishizuka, Hiroaki,Okubo, Masashi,Tsujikawa, Kazuma,Ueda, Takashi,Hachiya, Hideyuki,Mori, Junji,Aso, Toshiyuki,Otaka, Toru Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.3
The fractional slot windings are widely used in rotating machine in order to increase the flexibility of design and improve the voltage waveform. However, the MMF wave of fractional-slot windings are found to contain unique harmonic component, which are designated as even order space flux harmonics, fractional number flux harmonics, or both. They may cause stray loss and stator core vibration. This paper proposes new winding methods "novel interspersed windings" and "expanded group windings" to reduce these harmonics. The advantages of two proposed windings are verified by using numerical analysis and measurement test of winding model.