The pulsed linear induction motor concept for high-speed trains

Abstract

The SERAPHIM (SEgmented RAil PHased Induction Motor) concept is a linear induction motor concept which uses rapidly-pulsed magnetic fields and a segmented reaction rail, as opposed to low-frequency fields and continuous reaction rails found in conventional linear induction motors. These improvements give a high-traction, compact, and efficient linear motor that has potential for advanced high speed rail propulsion. In the SERAPHIM concept, coils on the vehicle push against a segmented aluminum rail, which is mounted on the road bed. Current is pulsed as the coils cross an edge of the segmented rail, inducing surface currents which repel the coil. Experiments were conducted to demonstrate the feasibility of the pulsed induction motor and to collect data that could be used for scaling calculations. A key component of the SERAPHIM concept is the use of passive wheel-on-rail support for the high speed vehicle. Standard steel wheels are capable of handling over 200 mph (321 km/h). The SERAPHIM cost is comparable to that for steel wheel high-speed rail, and about 10% to 25% of the projected costs for a comparable Maglev system.