Browse > Article

Heat Treatment of Stator Core in Permanent Magnet Type Motor for Reduction of Friction Torque and Analysis of Their Cause  

Ha, Kyung-Ho (POSCO 기술연구소)
Lim, Yang-Su (POSCO 전기강판)
Kwon, Oh-Yeoul (POSCO 기술연구소)
Kim, Ji-Hyun (POSCO 기술연구소)
Kim, Jae-Kwan (POSCO 기술연구소)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.57, no.10, 2008 , pp. 1752-1758 More about this Journal
Abstract
This paper deals with the reduction of friction torque in permanent magnet motors by using the heat treatment of stator core. The stator core is made of electrical steel sheared by the punching die. From the punching process, large mechanical stress acting on the edge of stator tooth induces significant plastic and elastic deformation and then cause the change of magnetization properties. Then, the mechanical and magnetic unbalance in the sheared region of stator tooth produced by material cutting has influence on the friction torque. This paper investigated the effect of the punching process on the magnetization process and the mechanical deformation, and then proposed the stress relief annealing method for the reduction of friction torque among one of motor characteristics.
Keywords
Electrical Steel; Friction Torque; Stator Core and Heat Treatment;
Citations & Related Records

Times Cited By SCOPUS : 0
연도 인용수 순위
  • Reference
1 홍정표, 하경호, '자성재료를 이용한 전자에너지 변환기기의 설계 및 특성,' 한국전기전자재료학회 춘계학술대회 논문집, pp. 1-5, 4, 2002
2 K. Yamamoto, E. Shimomura, K. Yamada and T . Sasaki, 'Effects of External Stress on Magnetic Properties in Motor Core,' IEEJ, Vol. 117-A, No. 3, pp.311-316, 1997
3 T. Wakisaka, T. Kubota and C. KAido, 'Best Selection of Motor Core Materials for Reduction of Motor ore Losses,' The Papers of Technical Meeting on Magnetics, IEEJ, RM -99-126, 1999
4 M. Satoh, S. Kaneko and M. Tomita, 'Stator Shape Improvement to Decrease Iron Loss Caused by Shrink Fit Utilizing Physical Properties of Electrical Steel Sheet,' IEEJ Trans. IA, Vol. 127, No. 1, pp.60-68, 2007   DOI
5 C. Kaido, J. Yamasaki and K. Hanzawa, 'Core Material Parameter Analysis of Torque Characteristics of Small Motor,' IEEJ Tans. IA, Vol. 126, No. 12, pp.1706-1711, 2006   DOI
6 M. Nakaoka et. al, 'Investigation of Effects of Cutting Strain and Compressive Force on Magnetic Properties Using a Single Sheet Tester,' Proc. of 16th Soft Magnetic Materials Conf., T2-28, 2003
7 International Standard, 'MAGNETIC MATERIALS - part 2 : method of measurement of the magnetic properties of electrical steel sheet and strip by means of an Epstein frame,' IEC 60404-2
8 M. Takezawa et al.,'Effect of Strain by Mechanical Punching on Non-Oriented Si-Fe Electrical Sheets for 9-slot Motor Core,' IEEE Trans. on Magnetics, Vol 42, No. 10, pp. 2790-2792, 2006   DOI   ScienceOn
9 S. Yamaguchi and A. Daikoku and N. Takahashi, 'Cogging Torque Calculation Considering Magnetic Anisotropy for Permanent Magnet Synchronous Motors,' COMPEL, Vol. 23, No. 3, pp.639-645, 2004   DOI   ScienceOn
10 A. Daikoku et al. 'Cogging Torque Calculation Considering Stator Core Stress Resulting from Frame in Permanent Magnet Motor,' IEEJ, RM-03-74, pp.13-18, 2003
11 M. Kawano, T. Fujiyama and T. Aoki, 'Electrical Steels for High-Functional Automotive Electrical Components Corresponding to Energy Saving,' Kawasaki Steel Technical Report, Vol. 48, pp. 47-52, 2003
12 T. Uda, M. Nakano and J. Fujiwara and N. Takahashi, 'A Method of Measurement of Magnetic Properties of Stress-Loaded Silicon Steel Sheets,' The Papers of Technical Meeting on Magnetics, IEEJ, MAG-01-83, pp.1-6, 2001
13 M. Enokizono, 'Two-dimensional Magnetic Properties,' IEEJ, Vol. 115, No.1, pp.1-8, 1995   DOI
14 A. Honda et al., 'Efficiency of Model Induction Motor Using Various Non-Oriented Electrical Steels', Journal of Material Science Technology, Vol. 16, No. 2, pp.238-248, 2000
15 M. Nakaoka, et. al, 'Examination of Temperature Characteristics of Magnetic Properties Using a Single Sheet Tester,' IEEJ, Vol 125-A, No. 1, pp.63-68, 2005