FIELD: electricity.
SUBSTANCE: method for capacitor braking of a twin-engine asynchronous electric drive, when windings of stators of both engines, shafts of which are rigidly connected, are connected in series via capacitors, and additional resistors are connected in series and in parallel with a capacitance. Engines are affected as a result of the fact that in each pair of serially connected winding phases there is a difference of phase EMFs that equals a linear EMF of a single engine. After disconnection of engines from the grid, the common capacitor tank with additional resistors is periodically, momentarily and phase by phase connected in parallel with additional resistors connected in series with starts of serial connection of different engine winding phases, in a time gap, when in each appropriate pair of serially connected phases of stator windings there is a difference of phase EMFs of these motors, and simultaneously, as decelerated engines achieve the rotation frequency close to the lower critical speed of capacitor braking, momentarily, alternately and phase by phase, plates of the capacitor tank are changed to inverse alternation of phases, then in the reverse order this is changed for the direct initial alternation of phases of capacitor tank plates.
EFFECT: increased reliability and efficiency of drive braking as a result of engines self-excitation conditions improvement and increase of braking torque.
9 dwg
