2Zhang Shengchang, Xu yangzeng, ZhongTingxiu, et al.Study on extra-high speed digital valve[A].Proceedings of the Fifth International Conference on Fluid Power Transmission and Control[C].Hangzhou:Zhejiang Univ Press,2001.158-161.
3Schmidt N, Guldner H.A simple method to determine dynamic hysteresis loops of soft magnetic Materials[J].IEEE Transactions on Magnetics,1996,35(2):3774-3780.