Pulsed linear induction motors for Maglev applications

摘要

Conventional linear induction motors (LIMS) have been used effectively to get linear thrust. These devices are typically short stator, and thus have entry and exit field effects. When a field enters a coil, there is a braking, drag force. A pulsed linear induction motor (PLIM) pulses the coils so that they push off the secondary shorted coils. Among the advantages gained by the use of these devices is no entry drag effect, simpler electronics required to excite the PLIM, and a smaller winding overhang past the steel structure of the PLIM. This invention describes coil arrangements useful for exciting a continuous array of coils, placed end to end, and coils that are overlapped. Control is realized by selecting the number of pulses to apply during the active excitation window.