Abstract
A generalized analytic model has been proposed for the vertical ground-coil-type linear synchronous motor for propulsion and levitaton use. Mathematical expressions have been derived for calculating its thrust and levitation force characteristics. The thrust and levitation force characteristics of the motor have been analyzed assuming various waveforms of ground coil current and magnetic flux. As a result of this analysis, it has been made clear that the waveforms of magnetic flux and ground coil current have a great effect on the thrust and levitation force characteristics. Waveforms of ground-coil current and magnetic flux should be determined taking into account many factors, such as the electric power supply scheme, power conversion scheme, running characteristics of train, etc. The proposed linear synchronous motor is more suited for high-speed trains than for the low-speed trains. In the low-speed region, it is recommended to drive and suspend the train by means of different devices.
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