SENSITIVITY ANALYSIS OF INDUCTION MOTOR USING FOURTH ORDER SLIP ESTIMATOR

摘要

An engineer designing a high-performance drive system must have intimate knowledge about machine performance, the dynamic model and parameter variations. The choice of material and the design of motors are influenced by this knowledge. Prediction of system performance due to the effect of parametric variations of the system is the main reason to perform sensitivity analysis of physical systems. In this paper the effect of variation in parameters of induction motor (IM) like stator and rotor resistance, leakage inductance and mutual inductance on the performance variables like input and output power, power factor, efficiency, developed and starting torque, stator current, starting current and magnetizing current has been discussed in detail. A fourth order nonlinear polynomial for determining the slip of the IM is derived and solved using computational methods to estimate the slip of the IM at different load conditions. In addition the effect of variation in the supply voltage and frequency on the said performance variables are also studied and analysed under different loading conditions through mathematical and computational methods. Experimental validations of the effect of variation in stator and rotor resistance on the sensitivity functions are also presented.