Measurement and control of output torque of DC motor shaft - by measuring armature current and multiplying by constant to represent max. torque developed

摘要

The measurement and control arrangement is for the output torque of a d.c. motor shaft. The armature current is measured and multiplied by a constant. A signal multiplied by this constant corresponds to the total maximum torque developed by the motor. Motor angular speed is measured, and a signal is differentiated w.r.t. time. The derivative signal is multiplied by a different constant, so that the resultant signal corresponds to the torque necessary for the motor acceleration. The two signals are subtracted from each other, and the difference signal displayed or used for control purposes.