Numerical impulse response test to estimate circuit-model parameters for induction machines

The estimation of electrical parameters of a cage induction machine is studied. First, the steady-state parameters are estimated using two-dimensional finite element analysis (FEA) with the assumption of sinusoidal time variation. Next, a numerical impulse response test using timestepping FEA is utilised to produce the voltage–current data for the small-signal model parameter estimation. The method is based on the assumption of linear behaviour near the operating point and the choice for the suitable excitation signal is studied. To distinguish the influence of the skin effect, the impulse response test is also performed for the corresponding slip-ring machine. The parameters are estimated from the frequency response function of the stator line current using differential evolution. The results of the FE simulations are compared with measurements.