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분할코어를 적용한 EPS용 SPMSM의 설계변수에 따른 조립공차에 의한 코깅토크 분석
고욱(Gu Xu),차창준(Chang-Jun Cha),박진철(Jin-Cheol Park),김동민(Dong-Min Kim),임명섭(Myung-Seop Lim) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
The EPS system is a driving aid that can improve the steering performance of the vehicle and reduce the driver’s burden of steering. However, because the EPS system is driven by a motor, it must be affected by the cogging torque generated from the motor. Moreover, when the assembly tolerances occur, the magnitude of the cogging torque will directly affect the steering performance of the vehicle. Therefore, in order to improve the cogging torque, factors affecting the cogging torque should be identified. In this paper, according to assembly tolerance, a 12pole-18slot motor is selected to analyze the factors affecting the cogging torque. Firstly, select the design parameters around the air gap. Secondly, determine the range of Slot-opening, Tooth-tip and PM thick which are the design variable of the motor. Finally, determine the tendency of the magnitude of torque and harmonic order of torque to vary with the design variable.
인휠 외전형 구동 모터의 극 슬롯 조합에 따른 전자기 손실 및 특성 분석
김필중(Peel Joong Kim),박수환(Soo Hwan Park),고욱(Gu Xu),임소연(So Yeon IM),안수민(Soo Min An),임명섭(Myung-Seop Lim) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
In-wheel motors are being studied as a next generation type motor for vehicle applications. And outer rotor permanent magnet synchronous motor(PMSM) is one of the most appropriate motor type for In-wheel motors because of its large torque property. Different from traditional traction motors, outer rotor PMSM directly drives wheels so mechanical loss is much smaller. As a result, electromagnetic loss including iron loss, copper loss and PM eddy current loss are major loss for In-wheel outer rotor PMSM. So to design high efficiency in wheel motor, analysis for electromagnetic loss is essential. So this paper discusses about the electromagnetic loss at main driving point of three outer rotor PMSM models with different pole slot combinations. 32pole 48slot, 40pole 48slot and 44pole 48slot combinations are chosen and additionally torque ripple characteristic that is important for ride quality is also analyzed. In conclusion, major electromagnetic loss and the best pole slot combination is chosen.