Analytical study of linear transformer - Linear motor apparatus for non-contact power supplied transportation

This apparatus operates as a linear transformer without thrust or two types of linear induction motors (LIMs) with propulsion force. One type of the LIMs is a secondary current controlled wound type of LIM with primary winding on ground and the other is the LIM with reaction plate on ground. The paper shows the characteristics of the linear transformer and the wound type of LIM designed renewedly considering both characteristics. The finite element method (FEM) tool is used for the analysis. As a result, it is cleared that the linear transformer can supply large power of 50kW per 1m length with unity input power factor and the efficiency of 0.95, and the wound type of LIM designed for urban transit has high efficiency and high input power factor respectively more than 0.9 for the optimum control.