AUTHOR : 황성우, 김동민, 채승희, 홍정표
ORGANIZATION : 한국자동차공학회
JOURNAL :
YEAR : 2014. 05
VOL :
ISSUE : 부문종합 학술대회
PAGE : ~
This paper presents optimum design process for minimizing cogging torque of EPS motor using appropriate rotor eccentricity and pole arc to pole pitch ratio. Improvement of driver’s steering feeling can be achived by optimizing motor in EPS system because motor is directly connected to driver through steering wheel. Considering that motor is mainly operated in low speed region, primary objective function of this optimization is cogging torque. Several design parameters have been researched to reduce cogging torque. Rotor eccentricity can be determined solely by eccentricity length and if number of poles is decided, pole arc to pole pitch ratio is determined only by pole arc. With their design simplicity, those two design parameters are selected to minimize cogging torque.
Statistical method, Response Surface Method(RSM) is used in this paper because relation between cogging torque and two design parameters cannot be investigated mathematically. Considering average torque and torque ripple additionally, optimum
design was performed.