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CDMA 고속초기동기획득을 위한 HW 재사용에 의한 정합필터의 설계
임명섭,Lim, Myoung-Seob 대한전자공학회 1998 電子工學會論文誌, S Vol.s35 No.11
기지국간 비동기방식을 사용하는 CDMA 이동통신 방식에서는 handoff시 초기동기 획득시간이 빠른 초기동기 획득방식이 요구되므로 정합필터를 사용하는 초기동기획득 방식이 고려될 수 있다. Rayleigh fading 채널에서 non coherent QPSK/DS-SS방식으로 신호를 수신하는 model에서 정합필터방식으로 초기동기획득을 위해 소요되는 평균 초기동기 획득시간은 직렬상관방식에 비해 정합필터의 길이에 비례하여 단축됨을 분석하였다. 그러나, 종래의 정합필터 방식이 초기동기획득시간은 단축되지만 HW복잡도로 인한 구현상의 단점을 보완하기위해 본 논문에서는 기억소자를 이용한 HW 재사용에 의해 상관 연산을 반복해서 할 수 있는 설계방안을 제시하므로써 기존 정합필터의 HW복잡도를 정합필터 분할 길이 만큼 줄일 수 있도록 하였고, Altera MAXPlus Ⅱ FPGA로 simulation하므로써 기능을 입증하였다. In the CDMA mobile communication system with asynchronous mode among base stations, the initial PN code acquisition method using a matched filter can be considered for the rapid PN code synchronization acquisition in the handoff region. In the model of the noncoherent QPSK/DS-SS under the Rayleigh fading channel, the mean acquisttion time of the matched filter is analyzed to have a shortened time in proportion to the length of matched filter to be compared with the serial correlation method. In this paper to improve the HW complexity of the conventional matched device which enables the repeated correlation process, is designed and its function is verified through the FPGAsimulation using Altera MaxPlus Ⅱ.
돌극성 기반의 센서리스 제어가 가능한 EV 구동용 집중권 IPMSM의 극 수-슬롯 수 조합에 대한 연구
임명섭(Myung-Seop Lim),채승희(Seung-Hee Chai),홍정표(Jung-Pyo Hong) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
This paper presents the decision process of pole-slot number combination for a saliency-based sensorless controlled interior permanent magnet synchronous motor(IPMSM) with concentrated winding for EV traction. To figure out the machine characteristics of noise and vibration, the equation about the force order(noise and vibration order) and the simulation results of the radial force are shown. Furthermore, it is suggested that calculating procedure for the changing pattern of d, q-axis inductance profiles varied with rotor position converted from the 3-phase inductances including harmonics to evaluate sensorless drive feasibility. Lastly, 115Nm-14kW 16-pole/24slot sensorless-oriented IPMSM model which is designed based on the decision process is proposed. The validity of the sensorless controlled prototype and the decision process are verified showing the d, q-axis inductance profiles of the machine under the maximum load condition.
[전기기기] 공간고조파해석 기법을 이용한 웨어러블 로봇용 SPMSM 설계
임명섭(Myung-Seop Lim) 대한전기학회 2019 전기학회논문지 Vol.68 No.5
This paper discusses the analytical design method of a 125W surface-mounted permanent magnet synchronous motor (SPMSM) as an actuator for an exoskeleton wearable robot. Considering the properties of the wareable robot application, pole and slot combination is determined to minimize vibration as well as cogging torque. In addition, the shape of the magnetic core and permanent magnets are determined by using the analytical approaches including space harmonic analysis (SHA) to maximize torque density as well as minimize cogging torque and torque ripple, simultaneously. As a result, the SPMSM which has high torque density with small axial length, low cogging torque/torque ripple and a large hollow rotor is designed.