http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
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.
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.
Radial Force Control of a Novel Hybrid Pole BLSRM
Huijun Wang,Dong-Hee Lee,Jin-Woo Ahn 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.6
This paper presents a novel hybrid pole BLSRM (Bearingless Switched Reluctance Motor) and its radial force control scheme. The proposed hybrid pole BLSRM has separated radial force poles and rotating torque poles. According to the FEM analysis, the proposed BLSRM has an excellent linear characteristic of radial force and controllability that is independent from the torque current. The radial force can be produced by the radial force winding which is wound at the separated radial force poles. The rotating torque is produced by the excitation current of the torque windings which are wound at the torque pole. The proposed radial force control scheme is independent of the phase torque winding current. A simple PID controller and look-up table are used to maintain a constant rotor air-gap. The proposed BLSRM and its radial force control scheme are verified by FEM analysis and experimental tests.
PMSM의 DTC-PWM 방식에 의한 고성능 토크 제어
왕혜군(Huijun Wang),이상훈(Sang-Hun Lee),이동희(Dong-Hee Lee),안진우(Jin-Woo Ahn) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
In this paper, an advanced DTC(Direct Torque Control) scheme for PMSM(Permanent Magnet Synchronous Motor) is presented. The proposed DTC method uses a conventional torque estimator and torque error. But the switching signal is generated by PWM method according to the switching rules and torque error. A simple calculation of PMW without any complex determination of space vector can assure the constant switching frequency with an excellent control performance. The proposed torque control scheme for PMSM is verified by computer simulation.
새로운 하이브리드 극 구조의 베어링리스 SRM 설계 및 운전특성
李東熙(Dong-Hee Lee),王惠軍(Huijun Wang),安永珠(Young-Joo An),安珍雨(Jin-Woo Ahn) 대한전기학회 2008 전기학회논문지 Vol.57 No.12
Bearingless SRM(Switched Reluctance Motor) is researched for high speed or special applications which can not use mechanical bearing such as bio pump. In this paper, a novel hybrid pole bearing less SRM is presented. The proposed hybrid pole bearing less SRM has salient poles for torque and suspending force production. Motor torque is controlled by the phase currents in torque pole windings, and the suspending force is controlled by suspending currents in four suspending windings for radial direction suspension. Because the proposed bearing less SRM has divided pole structure, mutual effects between torque current and suspending current are very lower than the conventional one's. From this structure, the number of power devices for power converter can be reduced for bearing less SRM driving. The proposed hybrid pole bearing less SRM is verified by the FEM analysis and experimental results.