| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric rotating machine having a rotor power supply converter. SOLUTION: The winding ES of a stator S is shorted, a voltage is applied to the winding ER of a rotor R via a static frequency converter 2, and the speed of the rotor is increased up to a specific value by controlling the frequency of the converter. At the instance when the rotor rotates at the specific speed, the winding of the stator is cut out, the voltage of a power supply network 8 is applied to the winding of the stator, and then the frequency of the converter is decreased, The converter can be miniaturized by changing the transformation ratio of an electric rotating machine before the speed of the rotor reaches the nominal speed of the machine. |
