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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.
Domain Wall Pinning by a Stray Field from NiFe on a Co/Ni Nanowire
R. Hiramatsu,T. Koyama,H. Hata,T. Ono,D. Chiba,S. Fukami,N. Ishiwata 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We have investigated the influence of a stray field on a magnetic domain wall (DW). Thedepinning fields of a DW in a perpendicularly magnetized Co/Ni nanowire with partly-stackedNi81Fe19/SiO2 islands on it was measured. The depinning field for the wire with Ni81Fe19/SiO2was found to be higher than that for the wire without the stack, indicating that the stray field fromthe Ni81Fe19/SiO2 stack clearly served as an artificial pinning site for the DW. The magnetic forcemicroscopy observation evidenced that the DW was pinned near the Ni81Fe19 stack.