Load current detecting apparatus of direct current motors
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorsKunio Sekiguchi, Masaharu Noguti
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Abstract
In a load current detecting apparatus of a DC motor for driving a mill stand and utilized to maintain a predetermined interstand tension, a simulating circuit is provided to remove the effect of acceleration or deceleration current and moment of inertia of the motor.
Claims4
Load current detecting apparatus of a direct current motor for driving a load comprising a load current detector including a simulation circuit representing a no load state of said motor, said similation circuit including a first circuit element representing an armature circuit of said motor and a second circuit element connected to said first circuit element and representing a counter electromotive force coefficient of said motor;
- means for applying to said first circuit element a signal representing terminal voltage of said motor so as to produce an acceleration or deceleration current of said motor;
- a comparator for comparing actual armature current of said motor with said acceleration or deceleration current to obtain a load current signal;
- and means responsive to said load current signal for controlling speed of said motor.
Dependencies are inferred from the claim text.