CONTROLLER FOR THYRISTOR LEONARD - TOKYO SHIBAURA ELECTRIC CO

Title:

CONTROLLER FOR THYRISTOR LEONARD

Document Type and Number:

Japanese Patent JPS5953090

Kind Code:

A

Abstract:

PURPOSE:To enable to smoothly control normal-to-reverse conversion and to enable to control at a high speed after the normal-to-reverse converter by deciding the firing angle immediately after the normal-to-reverse thyristor conversion by the armature induced voltage of a DC motor and the speed deviation. CONSTITUTION:A relay 25 is energized ON by an operating signal 24 during the normal operation, and a deviation signal between a current reference signal 4 and a current feedback signal 7 is outputted as a phase control signal 8 through a proportional integrator having an operational amplifier 28, a resistor 26e and a condenser 27. When a reverse current thyristor is switched to a positive current thyristor, the relay 25 is first deenergized, and a reverse side relay 30 is deenergized after the prescribed period. If the absolute value of the speed deviation is the prescribed value or higher at this time, a voltage feedback signal 23 is set to the condenser 27. If it is the prescribed value or lower in the positive value, a relay 33 is energized, and an addition signal of the positive correction signal and a voltage feedback signal 23 is set to the condenser 27.

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