In parallel with exploration and development of the pump-turbines for pumped storage power stations, generator-motors have been getting to be higher speed and larger unit output. The parameter of outputspeed is so often used for checking difficulty in designing and manufacturing of the generator-motors. TOSHIBA's basic concept is that they shall be of air-cooled type. As, nowadays, TOSHIBA has the equation [output × speed]= 3.0 × 105 (MVA × min-1) showing the maximum possible unit output in air-cooled type, most of the generator-motors under planning can be of air-cooled type.
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