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영구자석형 모터의 프릭션 토크 저감을 위한 고정자 철심의 열처리 및 발생원 분산
河京鎬(Kyung-Ho Ha),林良洙(Yang-Su Lim),權五烈(Oh-Yeoul Kwon),金智鉉(Ji-Hyun Kim),金在寬(Jae-Kwan Kim) 대한전기학회 2008 전기학회논문지 Vol.57 No.10
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.
영구자석 전동기 철심의 기계적 응력을 고려한 철손 해석
김지현(Ji-Hyun Kim),하경호(Kyung-Ho Ha),권오열(Oh-Yeoul Kwon),김재관(Jae-Kwan Kim),나민수(Min-Soo La),이선권(Sun-Kwon Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
Shrink fitting which is assembling process to fix stator core on the motor frame is widely used at the mass production line of motors because of cost and productivity. This process produces compressive stress on a stator core, which causes negative effect for example, core and copper losses on motor performance. Magnetic properties of electrical steel are effected by both compressive and tensile and thermal stresses. Electromagnetic field analysis is considered one of the effective process since one can predict motor performance including core loss precisely. This method can consider non linear magnetic property with magnetic saturation which is typical electrical steel behavior. However this method is strongly depended on non linear magnetic data, one may have different calculation result whether considering mechanical stress or not. This study describes magnetic field analysis of a motor considering mechanical stress from shrink fitting. Analysis results are compared with each stress-free and stressed condition.