Ground coil for magnetically levitated railway

Ground coils for a magnetically levitated railway in which superconducting coils are mounted on a vehicle and ground coils are arranged on left and right sides of a guideway for moving the vehicle by repulsion induced between the superconducting coils and the ground coils, wherein the ground coils are arranged in repeating units along the guideway, each unit comprising propulsion-levitation-guidance coils arranged on left and right sides of the guideway, said propulsion-levitation-guidance coils each comprising:

• (i) an upper coil having a levitation main-winding portion, a first intermediate terminal forming a guidance shunt-winding portion of said levitation main-winding portion, and a second intermediate terminal forming a propulsion shunt-winding portion of said levitation main-winding portion;
• (ii) a lower coil having a levitation main-winding portion, a first intermediate terminal forming a guidance shunt-winding portion of said levitation main-winding portion, and a second intermediate terminal forming a propulsion shunt-winding portion of said levitation main-winding portion, said upper coil and said lower coil being arranged one above the other and being null-flux connected at null-flex connection points;
• (iii) a first lead terminal connected to one of the null-flex connection points;
• (iv) a second lead terminal connected to the first intermediate terminal of said upper coil and the first intermediate terminal of said lower coil;
• (v) a third lead terminal connected to the second intermediate terminal of said upper coil and the second intermediate terminal of said lower coil;
• (vi) a first null-flux wiring line connecting the first lead terminals of the propulsion-levitation-guidance coils arranged on the left and right sides of the guideway;
• (vii) a second null-flux wiring line connecting the second lead terminals of the propulsion-levitation-guidance coils on the left and right sides of the guideway;
• and
• (viii) a propulsion wiring line led out individually from each of the first and third lead terminals on the left and right sides of the guideway, and connected to a propulsion power supply.