A method for real-time wireless monitoring of the efficiency and conditions of three-phase induction motor operation

Abstract Concerning the primary aim of attending to the requirements used in the monitoring of induction motor efficiency, along with prioritizing a low intrusion level, the Literature presents various methods that need only the voltages, currents and some rotor speed cases. In a general sense, these methods estimate the torque on the machine shaft, along with calculate the output power and efficiency, through the use of a variety of different techniques. In this context, the present study proposes a real time wireless monitoring method over the operation conditions and efficiency of the three-phase induction motors. The method proposed herein estimates through the values measured on the three-phase voltages and currents and the equivalent circuit of the machine, the torque and speed of the shaft. Based on these estimates, both output power and efficiency can be calculated. The equivalent circuit of the machine is estimated through an iterative algorithm that uses only the data from the machine plate and the resistance of the stator, as will be shown in this study.