A new linear synchronous motor for mag-lev train with integrated lift and thrust using a trapezoidal rail

An improvement to the ZigZag Linear Homopolar Synchronous Motor (ZZLHSM) providing a combined lift and thrust for maglev vehicles is described. The magnet of ZZLHSM is U-shaped and acts as a two-pole synchronous machine in which each pole is surrounded by a DC coil from a controlled DC power supply. Each pole is made up of two subpoles surrounded by an AC coil feeding from an inverter such that the field could be distorted among the four subpoles. The rail of the ZZLHMS is zigzag shaped and will move relative to the subpoles to minimize reluctance, hence propulsion is obtained. The improvement to the ZZLHSM described is in the trapezoidal shape of the rail. The performance of the Trapezoidally Railed Linear Homopolar Synchronous Motor (TRLHSM) was compared to that of the ZZLHSM with same winding and excitation conditions