Antislip Readhesion Control Based on Speed-Sensorless Vector Control and Disturbance Observer for Electric Commuter Train - Series 205-5000 of the East Japan Railway Company. - Satoshi Kadowaki; Kiyoshi Ohishi; Tadashi Hata; Norifumi Iida; Masashi Takagi; Takashi Sano 004; Shinobu Yasukawa (IEEE Trans. Ind. Electron., 2007)