A VLSI based Virtual Instrumentation for Low Cost Induction Motor Parameter Identification R.Saravana Kumar K.K.Ray

The steady state equivalent circuit parameters are essential for diagnosing the condition of an induction motor[1]. These parameters could be determined, with a good accuracy, through specific tests, but the procedure is time consuming and off line operations. The features of the condition monitoring system depends on the parameters that are obtained from the test results [2]. It is obvious that the related test procedure if embedded in a software environment will allow easy interaction between operator and signal acquisition. In this paper, the author is presenting an automatic on-line procedure for identification of induction motor equivalent circuit parameters for diagnosis of the health condition of the motor. The stator resistance, no-load and blocked rotor tests are performed automatically through the arrangement of relay and VLSI controller. VLSI controller is used to control the test voltage by controlling the firing pulses of an ac voltage controller. Relay arrangement is used to connect and disconnect the test arrangements according to the requirements. With the aid of DAQ 6024E card instantaneous values of current and voltage of the Induction Motor are acquired to feed the data in the Lab VIEW program to obtain the steady state equivalent circuit parameters for diagnosis purpose. 1