TESTING DEVICE FOR DC ELECTRIC MOTOR

PURPOSE:To prevent a decrease in operation efficiency due to the overoutput or overvoltage trip of an electric motor by providing a torque setter for setting the current of a boosting thyristor, a speed setter for setting the speed of a testing machine, etc. CONSTITUTION:A load torque current is flowed to the boosting thyristor 3, electric motor 5, generator 4, etc., under the command of the torque setter 14. In this case, the generator 4 and electric motor 5 are reciprocal and enter a lock state. The command of the speed setter 18 is controlled by a speed controller 13 so that the deviation of the quantity of feedback of a speed detector 11 coupled directly with a track wheel 10 is zero. A speed deviation command, on the other hand, controls the current of a main thyristor 6 so that the deviation from the feedback of a current detector 2 is zero. Then, an acceleration current flows to the generator 4 through a thyristor 6 according to the command of the setter 18 to generate a torque difference between the generator 4 and electric motor 5, thereby accelerating the testing machine. Thus, the quantity of torque and the speed are set by the setters 14 and 18 individually.