JPS5456124A - Torque controller for dc machine - Google Patents

Abstract

PURPOSE: To control a torque at constant of the motor, by such means that a required current set value be divided to be processed operation by a value corresponding to a field quantity of the DC machine to be controlled, with this arithmetic value inputted as a set signal to a current controller and an armature current controlled.

CONSTITUTION: For a rotational speed of the DC motor below the specified rotational speed, an excitation quantity, by a field current flowing into a field coil 2, is controlled at constant, causing a setting, inputted to a current controller 5A from a divider 16, also to be at constant, with an armature current being controlled at constant. In this case, regardless of a surge of the rotational speed, a control will be operated at a constant torque corresponding to a setting of current setter 4. For a rotational speed exceeding the specified speed of rotation, a selector 11 is switched by a select command device, with a detected signal of voltage sensor 8 inputted to a field controller 12, and a field control system, by the field controller 12, will suppress the field current to operate a control at a constant torque, with an armature counter electromotive force, detected by the voltag sensor 8, so as to be a setting of the set value 10

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