METHOD AND DEVICE FOR CONTROLLING THYRISTORS OF REVERSE TRANSFORMER FOR POWERING ANCHOR CIRCUIT OF CONSTANT CURRENT ELECTRIC MOTOR (VARIANTS) Russian patent published in 2007 - IPC H02M1/08 

FIELD: transforming equipment, possible use in systems for impulse-phase control of reverse thyristor transformer with phase adjustment by magnetic amplifier and used for powering anchor circuit of constant current electric motor.

SUBSTANCE: in accordance to the invention, during control of thyristors of reverse transformer with separate control of two mutually-parallel coupled groups of thyristors, phase adjustment of each group is performed by magnetic amplifier with electrical comparison of setting voltage and check connection voltage, proportional to electric motor rotation frequency, and in accordance to invention, in absence of setting by shifting signals, magnetic amplifiers are closed and control impulses of both groups are removed. On appearance of setting, control impulses are sent to corresponding group of thyristors, enabling it in rectifying mode. After brake or reverse command, working group is transferred to inverter mode with maximal adjustment angle, with time delay control impulses for the group are removed and second group of thyristors is enabled also with maximal value of adjustment current, value of which is then decreased until motor EMF exceeds average voltage value of inverter group which begins to let through the braking current of motor, which is limited by current cut-off in the future. At the end of braking at reverse, second group is transferred to rectifying mode, and during transferring to lower speed after the motor reaches given rotation frequency the second group is again transferred to operation with maximal adjustment angle, with time delay control impulses for the group are removed and first group of thyristors is enabled in rectifying mode with new given value of electric motor rotation frequency.

EFFECT: ensured serviceability of reverse thyristor transformer with phase adjustment by magnetic amplifier, used for powering anchor circuit of constant current electric motor, in whole range of adjustment, and expanded arsenal of technical means; control of thyristors of reverse transformer without compensating currents in whole range of adjustment.

3 cl, 2 dwg