... . ei silicon core 1) Stator diameter: Φ74mm 2) Rotor diameter: Φ42mm 3) Materials (silicon steel sheet): a) Bao steel: B50A1000, ... B50A800, B50A600, B50A470, B35A550, B35A440 b) Tai steel: 50TW800, 50TW600, ... 50TW1000, 50TW470 c) Wu steel: 50WW1300, 50WW800, 50WW600, 50WW470, ...