| 摘要 |
<p>PROBLEM TO BE SOLVED: To achieve a position detecting system capable of accurately detecting a car position in the entire speed range without using crossed induction lines, in a magnetic-levitation railway of a ground primary system. SOLUTION: In the position detecting system 10, a wheel rotational position and speed detecting part 12 detects the car position from a wheel rotational pulse-count value Kw proportional to the revolutions of a wheel 67. A speed electromotive force position and speed detecting part 14 detects the car position from a speed electromotive force phaseθe presumed by an speed electromotive force observer 31. Then, a position data controlling part 11 selects and outputs the car position detected by the wheel rotational position speed detecting part 12 when car speed is less than 30 km/h and by the speed electromotive force position and speed detecting part 14 when the car speed is equal to or faster than 30 kg/h respectively. If the car position becomes unobtainable by the speed electromotive force position and speed detecting part 14, the car position by a coil-count position and speed detecting part 13 (based on the count value Kc of levitation and guide coils) is used as a backup.</p> |
