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분리된 서스펜션 극을 가지는 베어링리스 SRM의 직접 공극 제어기법
박태흡,이동희,안진우 경성대학교 공학기술연구소 2010 공학기술연구지 Vol.16 No.-
This paper presents direct radial force control scheme of bearingless SRM with separated torque and suspending winding poles. The proposed motor has separated stator poles for radial force winding and phase winding. And the radial force stator pole is placed opposite and perpendicular position for continuous radial force generation. In order to keep the rotor to the center of the motor, radial forces in x and y direction are controlled by the radial force winding current. The proposed radial force control scheme is independent to phase torque winding current. A simple Pill controller and look-up table are used to maintain constant rotor air-gap.
Self-Starting 성능을 개선한 2상 SRM의 특성해석
박태흡(Tae-Hub Park),Huynh Khac Minh Khoi,이동희(Dong-Hee Lee),안진우(Jin-Woo Ahn) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.10
Analysis of two phases SRM with improved self-starting characteristic is proposed in this paper. Different from the conventional structure, in this paper three different 4/2 structures are proposed, in order to make self-starting possible in every rotor position. Furthermore mechanical balancing is considerly in this analysis. because unbalance mechanical structure will produces more vibration and more noise specially in high speed applications.
소프트웨어 PLL 기반 소형 고속 BLDC의 속도 제어
박태흡(Tae-Hub Park),석승훈(Seung-Hun Seok),이동희(Dong-Hee Lee),안진우(Jin-Woo Ahn) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
This paper presents a PLL(Phase Lock Loop) control method for speed control of high speed miniature BLDCM(Brushless DC Motor) using hall sensor. The proposed PLL based speed control method uses a only phase shift between reference pulse signal according to speed reference and actual pulse signal from hall sensor. It doesn't use any speed calculation, and calculates a direct current reference from phase shift. The current reference is changed to reduce the phase shift between reference and actual pulse. So the actual speed can keep the reference speed. The proposed control scheme is very simple but effective speed control is possible.
박태흡(Tae-Hub Park),Huijun Wang,이동희(Dong-Hee Lee),안진우(Jin-Woo Ahn) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
In this paper, a novel structure Bearingless SRM with hybrid stator poles is proposed. The motor torque can be controlled independently from radial force control. Analytical models of torque and radial force for proposed structure are explained. Based on these models, control scheme of desired radial force is proposed. In this control method, the magnitude of force can be controlled in arbitrary direction and magnitude by selecting some combinations of radial force windings. The validities of structure and control method are verified by the experimental results when motor is at standstill and running.
Huijun Wang,박태흡(Tae-Hub Park),김태형(Tae-Hyoung Kim),이동희(Dong-Hee Lee),안진우(Jin-Woo Ahn) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
As generally recognized, the driving performance of a SRM at higher speed will be degraded due to the effects of back electromagnetic force (EMF). This phenomenon can be improved via voltage boosting. So in this paper an improved converter of enhancing the performance for four-phase switched reluctance motor (SRM) is proposed. By using one additional capacitor and switches, an extra controllable boosted voltage can be produced during the rise and fall periods of a motor phase current. Then this active boosted voltage can reduce the effect of EMF on the current, particularly at high speeds. The attractive features of the proposed converter are as follows: obtaining boosted voltage to improve performance of SRM with same numbers of switch and diode as asymmetric converter, having higher control flexibility and capability of boosting voltage compared with passive boosting converters, possessing lower cost and simple control in comparison with existing active boosting converters. The performances of the proposed circuit are verified by the simulation and experiment results.
Huijun Wang,박태흡(Tae-Hub Park),김태형(Tae-Hyoung Kim),이동희(Dong-Hee Lee),안진우(Jin-Woo Ahn) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
Bearingless switched reluctance motors (SRM) have combined advantages of conventional SRM and magnetic bearings. Therefore in this paper based on novel structure of Bearingless SRM, an accurate mathematic model of radial force is deduced. Meanwhile in order to realize steady suspending, a novel radial force control method── Direct Instantaneous Radial Force Control (DIRFC) is presented. The effectiveness of new model and DIRFC is proved by the simulation results.
Characteristic Analysis of Bearingless SRM with Hybrid Stator Poles (pp.6-8)
Huijun Wang,박태흡(Park Tae-Hub),이동희(Dong-Hee Lee),안진우(Jin-Woo Ahn) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.4
In this paper a novel bearing less switched reluctance motor (SRM) with hybrid stator poles is proposed. The operating principle of proposed motor is also presented. Compared with existing bearingless SRM, it has many advantages such as lower number of switches and cost. simpler control algorithm, lower thermal load. Meanwhile through finite element method (FEM) characteristics of proposed structure such as inductance, torque and radial force can be obtained. According to the FEM results, the above advantages of the proposed structure can be verified.