Experimental assessment of the accuracy of the method for determination the power on an induction motor shaft

The paper describes the method for indirect determination of the torque, power and energy indices of an induction motor shaft. A developed research laboratory stand is presented. It enables load testing of an induction motor with a possibility of direct measuring the torque, speed, currents and voltages of the researched motor. The analysis of the experimental research of the method for indirect determination of the power on an induction motor shaft revealed acceptable accuracy even under the conditions of determination of stator resistances with a considerable error. It is recommended to apply this method in variable-frequency electric drives for monitoring, diagnostics, fault-tolerant control and also for testing new and repaired motors.