AUTONOMOUS STAGED STABLE-FREQUENCY GENERATOR Russian patent published in 1997 - IPC

FIELD: electric engineering, in particular, drives with alternating rotation speed of driven electric motor. SUBSTANCE: rotors of induction frequency converters 1 and 2 are located on single shaft. Three-phase windings of rotors are connected. Stator winding of first frequency converter 1 serves as input winding, stator winding of second frequency converter 2 serves as output winding. Master stable-frequency generator 3 outputs stable-frequency voltage which excites rotating magnetic field of induction converter 1. Master stable-frequency generator 3 is designed as static frequency converter 6 and excitation member 4 which is designed as synchronous generator which is excited by permanent magnets and is located on common shaft with induction frequency converters 1 and 2. Voltage feedback circuit is provided between output of generator and master stable-frequency generator 3. Rotors of induction converters 1 and 2 has equal number of pole pairs and same direction of magnetic field rotation. EFFECT: increased functional capabilities. 1 dwg