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전기자동차 냉각 장치용 컴프레서 모터의 공간 고조파 법을 통한 코깅토크 저감 방안
김희운(Heewoon Kim),배종준(Jongjun Bae),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Recently, by a sudden change in environment and a rise in oil price, the paradigm of vehicles is changing combustion engine to EV (Electric Vehicle) and HEV (Hybrid Electric Vehicle). Therefore, the study of the motor to replace belt driving is active in vehicle manufacturers. The cogging torque is often the source of vibration and noise in permanent magnet motors and the vibrations and the noises are cause of the loss and the troubles of motors. Therefore, reduction of cogging torque is the essential factor of motor designs. This paper compared two rotor design techniques to cut the circle of rotor with shape of straight line for reduction of cogging torque. And the result by FEM (Finite Element Method) and method of spatial harmonic show the cogging torque getting smaller.
회전자 편심과 극호비를 이용한 EPS용 전동기의 코깅 토크 저감 최적설계
황성우(Sung-Woo Hwang),김동민(Dong-Min Kim),채승희(Seung-Hee Chai),홍정표(Jung-Pyo Hong) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
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.
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.
김용범(Yong-Beom Kim),김해중(Hae-Joong Kim),정경태(Kyung-Tae Jung),홍정표(Jung-Pyo Hong) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
This paper presents a study of an unexpected cogging torque due to the manufacturing errors. During the manufacturing, to reduce the cogging torque, various design techniques are applied. For example, adoption of skewing, rotor eccentricity and pole/slot combination can be regarded. However, some techniques, which are effective cogging torque reduction methods, become ineffective and sometimes, cause the unexpected cogging torque when the manufacturing defects exist. In this paper, the unexpected cogging torque is analyzed by using a couple of methods such as the rotor surface flux density measurement, the harmonic analysis and so on.
전기자동차 냉각 장치용 Compressor 모터의 코깅토크 저감 방안
김희운(Heewoon Kim),배종준(Jongjun Bae),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Recently, by a sudden change in environment and a rise in oil price, the paradigm of vehicles is changing combustion engine to EV (Electric Vehicle) and HEV (Hybrid Electric Vehicle). Therefore, the study of the motor to replace belt driving is active in vehicle manufacturers. The cogging torque is often the source of vibration and noise in permanent magnet motors and the vibrations and the noises are cause of the loss and the troubles of motors. Therefore, reduction of cogging torque is the essential factor of motor designs. This paper compared two rotor design techniques to cut the circle of rotor off with shape of arc and straight line for reduction of cogging torque. And the result by FEM (finite element method) show the cogging torque getting smaller.
고정자 비대칭 Tooth Tip과 회전자 Step Skew를 조합한 표면형 영구자석 모터의 코깅 토크 저감 설계
이충성,김해중 한국자기학회 2023 韓國磁氣學會誌 Vol.33 No.1
A low cogging torque and torque is the key performances of the motor with the required high precision drive. Therefore, skew design methods for stator and rotor have been widely applied to reduce cogging torque. However, the skew design has many weaknesses to increase cost and deteriorate performance due to the additional equipment and processes for manufacturing. In this study, a hybrid design method is proposed to reduce cogging torque and torque ripple by applying the asymmetry tooth tip of stator and rotor skew in permanent magnet synchronous motor, instead of using the conventional rotor skew design. The application case for the proposed method deals with the asymmetric tooth tip of stator and 2 step-skew rotor, which is equivalent to have the performance effects of 4 step-skew rotor. In order to verify the proposed method, cogging torque was compared using 2D finite element analysis (FEA). In addition, back-EMF and torque ripple are also compared.
분할 코어를 적용한 EPS용 SPMSM의 공차에 따른 코깅 토크 분석
차창준(Chang-Jun Cha),박진철(Jin-Cheol Park),박민로(Min-Ro Park),임명섭(Myung-Seop Lim),이충성(Choong-Sung Lee) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
The Electric Power Steering(EPS) system is directly related to safety. So, the whole system is mechanically connected. Due to mechanical characteristics of the steering system, vibrations generated by the EPS motor are transmitted to the driver. Cogging torque is generated by the interaction between the permanent magnet and the slot structure. Cogging torque is one of the torque ripple components. This paper investigates the cogging torque according to manufacturing tolerance of SPMSM with Segmented-Core for EPS. First, manufacturing tolerances for each part of the motor will be introduced. Then, the harmonics of the cogging torque due to each manufacturing tolerance of the motor part are analyzed. Finally, by comparing the simulation result with test value, the validity of this study is demonstrated.
전동식 조향장치용 브러시리스 모터의 스큐 방식에 따른 코깅 토크 해석
이민환(MinHwan Lee),김광일(KwanIl Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
As enforced the regulation of fuel efficiency and increased the demand of green car, many interest are focused on electric vehicle and hybrid electric vehicle. Therefore electronicizing of driving, steering and braking system is also actively proceeding. Especially electric power steering is substituting for hydraulic power steering which is complex and big relatively because of increasing the fuel efficiency. In electric power steering system, the most important part is motor. Consequently, the silent motor is main issue to improve the system quality. Cogging torque is the main design factor to improve the motor vibration and noise. To reduce the cogging torque, generally skewed stator or rotor has been applied. But which one has better performance in steering system is not known well. In this paper, through 3D electromagnetic analysis of motor design to reduce effectively cogging torque, which kind of skew type is suitable for steering system is studied.
코깅토크 측정장치 직접구동용 영구자석 동기전동기의 정밀속도 제어
박철훈(Cheol Hoon Park),손영수(Young Su Son),함상용(Sang Yong Ham),김병인(Byung In Kim),윤동원(Dong Won Yun) Korean Society for Precision Engineering 2009 한국정밀공학회지 Vol.26 No.5
Recently PMSM(Permanent magnet synchronous motor) are used for the various direct drive applications such as index table, telescope system and so on. Because the position/speed control performance of direct drive PMSM is directly affected by the torque ripple, there are lots of studies to reduce the cogging torque in the motor design stage. In order to verify the motor design, the reliable cogging torque measurement system is essentially required. The measured motor must be rotated in the constant speed under 1deg/sec so that the cogging torque profile is measured correctly. In this study, the cogging torque measurement system which uses the direct drive PMSM and the speed controller to rotate the measured motor in 0.1rpm(0.6deg/sec) has been developed. Simulink/xPC target was used for the controller and data acquisition system. Based on PI controller, DOB and AFC have been applied to eliminate the low frequency disturbances and the periodic speed ripple. The experimental results show the good performance of the speed regulation for the reference speed 0.1rpm and the reliable profile of the measured cogging torque by the developed speed controller.
김태식(Taesik Kim),정성준(Sungjoon Jung) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
EPS (Electric Power Steering) having merits of fuel efficiency, driver’s convenience, environmental friendly and good maintenance has continuously evolved for high power, low friction, noise and ripple. Motor embedded in EPS accounts for major portion of the required characteristics. Hence, many researches on the motor have been made and still going on. This paper establishes the formula for cogging torque and torque ratio of step skew type motors compared to non-skew and introduces the cogging torque simulator for the sake of time saving and parametric influence studies. The results of calculation formula and numerical approach by the developed simulator were validated with 2D FEA analysis. Then the optimal skew angle was compensated in accordance with 3D FEA analysis and experimental results. In result, one can make a good and efficient cogging torque design and set up own strategies to reduce it.