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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.
Basic Design of Bearingless Switched Reluctance Motor with Hybrid Stator poles
Wang, Huijun,Liu, Jianfeng,Ahn, Jin-Woo Journal of International Conference on Electrical 2012 Journal of international Conference on Electrical Vol.1 No.3
In this paper, a novel bearingless switched reluctance motor (BLSRM) with hybrid stator poles is proposed. The structure and operating principle are presented. In order to describe the design methodology clearly, analytical torque and radial force models are established. Further, basic design procedure is described. The numbers of phases and poles have important influence on the selection of structure. These effects, along with sizing of machine envelope and internal dimensions, make the machine design an insight-intensive effort. Effect of pole arcs and air-gap length on the production of torque and radial force are analyzed in detail. Mechanical design factors such as hoop stress and first critical speed are also considered. Based on the above analysis, the characteristics of the proposed BLSRM are analyzed. A prototype motor is designed and manufactured. The validity of the proposed structure is verified by the experimental 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.-
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.
호이스트 견인용 SRM의 스무딩 운전을 위한 DITC 기법
Huijun Wang,이진국(Zhen-Guo Lee),안영주(Young-Ju An),안진우(Jin-Woo Ahn) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
The DITC of SRM for smooth hoist driving is presented in this paper. In the hoist system, the switched reluctance motor (SRM) is applied instead of induction motor because of high efficiency and good traction characteristic. In order to improve start -up and stop performance of hoist system, the smoothing operation sequence of SRM using DITC is proposed. According to the switching sequence and hysteric band, the instantaneous torque is controlled. Since, the proposed method uses only the tum-on angle depending on variation of load and speed, a simple DITC can be implemented. The validity is proved by simulation and experiment.
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.
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.
왕혜군(Wang Huijun),이상훈(Sang-Hun Lee),이동희(Dong-Hee Lee),안진우(Jin-Woo Ahn) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
In this paper, a modified multi-level convert for low cost high speed switched reluctance (SR) drive is proposed. The proposed multi-level converter has reduced number of power switches and diodes than that of a conventional asymmetric converter for SRM, and lower voltage rating of the dump capacitor comparing with energy efficient c-dump converter. It can supply five operating modes that is boosted, DC-link, zero, negative bias and negative boosted voltage. The proposed multi-level converter has fast excitation and demagnetization modes of phase current, so dynamic response can be achieved. The proposed multi-level converter is verified by computer simulation and experimental results.