| 摘要 |
An apparatus for the conversion of electric energy into mechanic energy and vice versa includes a wound-rotor induction machine provided with a stator (S) and a rotor (R) both connected to a same three-phase line (L) through respective connection lines (CS, CR), a motor (M) connected to the rotor (R) and capable to take it to a speed twice the synchronous speed, as well as a step-down transformer (T) and a switch (P) arranged on the connection lines (CS, CR) in such a way as to allow to perform the parallel connection of the stator (S) or of the rotor (R), As a consequence, the machine generates twice the power available for a given size, and weight of iron and copper, because the rotation speed of the machine is twice the synchronous speed and because has a double connection to the line. Furthermore, in this way the induction machine can operate as generator or as synchronous motor.
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