Real-time flux-torque estimation of three phase induction motor using LabVIEW

Vector control of induction motor is most popular control strategy for industrial applications as it covers the wide speed range from near zero to rated speed. This strategy is very complex and challenging to implement in real time. Therefore, a LabVIEW based development platform has been used for realtime implementation of the strategy. This platform has an advantage of flexible algorithm design and easy monitoring of state variables involved in the design. Here authors have developed the flux estimation technique using real-time data logging and real-time data processing. The relation between magnitude and phase of transformed variables is established. This process involves appropriate calibration of voltage and current sensors and determination of proper scale value of sensor outputs. This scale value is calculated considering the sensitivity of sensors and data acquisition system (DAQ). The main objective of this paper is to enlighten most of the practical difficulties in implementation of a hardware-based design of vector controlled induction motor drive. It encompasses the critical factors during the implementation of an algorithm on a LabVIEW based platform.