CONTROL METHOD OF FREQUENCY-ASSISTED ELECTRIC DRIVE Russian patent published in 2013 - IPC H02P1/30 H02P1/52 H02P27/06 

FIELD: electricity.

SUBSTANCE: according to control method of frequency-boosted electric drive in closed positions of commutators (1, 5) and disconnected commutator (7) as per signals of controller (9) there performed is engine acceleration to the frequency close to frequency of network 8. During acceleration, converter gradually increases output frequency starting from zero one. Upon completion of acceleration process of motor 6, converter 2, as a rule, is synchronised with network 6. After that, controller 9 supplies command for closure of network switch 7 and pickup of control pulses (locking) by inverter (4). When this command is being implemented, almost immediate locking of converter takes place and contacts (7) are closed just in a few milliseconds. On the motor side, converter with closed transistors represents a diode bridge, to the poles of which a capacitor is connected. Therefore, it serves as a damping chain at connection of contacts (7). Such a chain reduces possible overvoltages and vibrations occurring at connection due to non-homogeneity of closure of contacts, their rebound, disturbance of phase synchronism at synchronisation, etc.

EFFECT: improving reliability.

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