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Pakasit Somsiri,Ruchao Pupadubsin,Prapon Jitkreeyan,Seubsuang Kachapornkul,Kanokvate Tungpimolrut,Nattapon Chayopitak,Pichai Aree 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper proposes a simple method to estimate the initial rotor position of a three-phase star-connected switched reluctance motor at standstill without position or current sensor. The key principle of the initial rotor position estimation is based on the stator inductance variation related to the actual rotor position. In the proposed method, only two narrow pulse voltage injections are applied in sequence and the initial rotor position can be estimated by comparing phase voltages and simple calculation. The method is suitable for low-cost applications where motor parameters and phase current data are not required. The proposed method is implemented for a 6-stator-pole, 4-rotor-pole, and 1.5 kWthree-phase star-connected switched reluctance motor. The experimental results show the effectiveness of the proposedmethod. The accuracy of the initial rotor position estimation is within 2.5 electrical degrees, which is sufficient to start-up the switched reluctance motor without rotor back-kicking.