Levitation and Propulsion for a Magnetically Levitated Conveyance System Using a Two-Phase Linear Motor

摘要

Magnetically levitated conveyance systems have been developed. Most consist of a levitation (and guidance) section and a thrust section. We have developed a conveyance system that realizes levitation and propulsion with a single facility using a two-phase linear motor. In this system, the levitation and propulsion system are combined. The control method for the propulsion system to achieve more stability is discussed. To obtain the propulsion force, modulation of the voltage applied on the primary windings is undertaken. A traveling field is generated and applied to a carrier with a secondary iron core. The levitation force is produced by attraction between the flux generated by the primary windings and the secondary iron core. Because we need only electrical power for FET switching on the carrier side, no power supply system for the carrier is needed. Experimental results indicate that this system realizes contact-less conveyance with various propulsion patterns.