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A rotary phase converter, abbreviated RPC, is an electrical machine that produces three-phase electric power from single-phase electric power. This allows three phase loads to run using generator or utility-supplied single-phase electric power. ==Original "Kandó" design== At the beginning of the 20th century, there were two main principles of electric railway traction current systems: # DC system # 16 2/3 Hz three-phase system These systems used serial traction motors. All of them needed a separated supply system or converters to the standard 50 Hz electric network. Kálmán Kandó recognized that the electric traction system must be supplied by single-phase 50 Hz power from the standard electric network, and it must be converted in the locomotive to three-phase power for traction motors. He created an electric machine called a synchronous phase converter, which was a single-phase synchronous motor and a three-phase synchronous generator with common stator and rotor. It had two independent windings. The winding placed closer to the rotor is a three-phase (or variable-phase) synchronous generator and the other is a winding of a single-phase synchronous motor. The winding of the motor takes the power from the overhead line and the generator provides the power for the three (or more) phase traction motors. The direct feed from a standard electric network makes the system less complicated than the earlier systems and makes possible simple recuperation. The single-phase feed makes it possible to use a single overhead line. More overhead lines increase the costs, and restrict the maximum speed of train. The asynchronous traction motor can run on a single RPM determined by the frequency of the feeding current and the loading torque. The solution was to use more secondary windings on phase converter, and more windings on motor different number of magnetic poles. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rotary phase converter」の詳細全文を読む スポンサード リンク
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