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

摘要

An improvement to the ZigZag Linear Homopolar Synchronous Motorn(ZZLHSM) providing a combined lift and thrust for maglev vehicles isndescribed. The magnet of ZZLHSM is U-shaped and acts as a two-polensynchronous machine in which each pole is surrounded by a DC coil from ancontrolled DC power supply. Each pole is made up of two subpolesnsurrounded by an AC coil feeding from an inverter such that the fieldncould be distorted among the four subpoles. The rail of the ZZLHMS isnzigzag shaped and will move relative to the subpoles to minimizenreluctance, hence propulsion is obtained. The improvement to the ZZLHSMndescribed is in the trapezoidal shape of the rail. The performance ofnthe Trapezoidally Railed Linear Homopolar Synchronous Motor (TRLHSM) wasncompared to that of the ZZLHSM with same winding and excitationnconditions