ORGANIZATION :
JOURNAL : 한국자동차공학회
YEAR : 2017.11
VOL :
PAGE :
The steering system for drivers has been developed. In the existing steering system, Hydraulic Power Steering (HPS) system that is always operated by engine is substituted to the electric power steering (EPS) Systems. The EPS system is more effective system for fuel economy, CO2 emission reduction and removal of lubricating oil, than HPS. Also, it is more environmentally friendly and economical. The car steering system is directly connected to the driver's safety so, it should be designed carefully about cogging torque and torque ripple. However, PMSM for EPS is subject to static eccentricity due to process errors and mechanical defects, which affects the stability of the steering system. This paper compares and analyzes the effect of static eccentricity according to the number of poles and slots in PMSM (Permanent Magnet Synchronous Motor) for EPS. The target models are 8 poles 9 slots and 8 poles 12slots. In the same outer diameter of stator and rotor, the models will be compared and analyzed back electro-motive force and cogging torque, torque ripple with a result of harmonic analysis.