Title :
Effect of Strain by Mechanical Punching on Nonoriented Si–Fe Electrical Sheets for a Nine-Slot Motor Core
Author :
Takezawa, M. ; Kitajima, K. ; Morimoto, Y. ; Yamasaki, J. ; Kaido, C.
Author_Institution :
Dept. of Appl. Sci. for Integrated Syst. Eng., Kyushu Inst. of Technol., Kitakyushu
Abstract :
Domain observation has been done to investigate the effect of strain due to a punching process on the magnetization process of a nine-slot core for 12-pole small brushless dc motor by using the Kerr microscopy technique. Stripe domain structures oriented to a transverse direction are observed at the edge of a tooth of the core without stress relief annealing. Due to the domain configuration, permeability near the punched edge of the motor core is reduced. A stress relief annealing at 700degC for 2 h can relive the punching stress
Keywords :
magnetic cores; magnetic permeability measurement; punching; 2 h; 700 C; Kerr microscopy technique; Si-Fe; domain configuration; magnetic domain observation; magnetization process; mechanical punching; nine-slot motor core; nonoriented electrical sheets; permeability; small brushless dc motor; strain effect; stress relief annealing; stripe domain structures; Annealing; Brushless DC motors; Capacitive sensors; DC motors; Magnetic cores; Magnetic field induced strain; Magnetic force microscopy; Magnetization processes; Punching; Stress; Magnetic domain observation; nonoriented Si–Fe electrical sheet; punching process; stress relief annealing;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2006.879900
