Abstract:
In general, the torque and speed monitoring system used in electrical machine testing, requires expensive torque and speed sensors, which is hard to install and cannot be coupled with a general-purpose three-phase induction motor. To overcome these problems, a novel torque and speed monitoring system for electrical machine testing is developed and presented in this thesis. The proposed system, which is based on the torque and speed sensorless induction motor control theory, detects the input voltage and current of the induction motor, and uses them to calculate the torque and speed by a digital signal processor instead of using the torque and speed sensors. In addition, the effects of the core loss and mechanical loss are compensated to improve the accuracy of the calculated torque and speed. It is verified by experimental results that the developed system is capable of measuring or controlling both the torque and speed accurately within the errors of +-10% and +-1% of their rated values, respectively.