Research of Current Resonant Inverter for SR Motor

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The SR motors are rigorously investigated in these days, and there are various kinds of SR motor drive circuits. Electric vehicle is one of the most promised field of reluctance motor applications because of their simple and rigid structure, and the future possibility of lower cost than that of induction motors' is also strongly focused point.This motor has relatively high reactance and the stored excited energy has to be retrieved after each powering period. Therefore the energy retrieval period usually becomes longer and the shorter retrieval period is desired to obtain higher output power and higher efficiency.For this purpose, some kinds of driving circuits are already proposed. Many of them are utilizing hard switching types, and they may cause high electro-magnetic interference (EMI) and lead to rather high switching losses. A soft-switched type drive-circuits with resonant circuit seems to have less EMI and less switching losses. However, they utilize continuous resonant-switchings, and may result in high resonant circuit losses.This research studied with soft-switched type drive-circuit, including only four switching devices, and has the merits of low switching losses, low EMI, and higher efficiency. The proposed circuit is expected to provide a low-cost, highly efficient low-EMI system to meet the demand for further reductions in EMI by the experimental results.