Eigenvalue sensitivity of a speed-sensorless CSI-fed induction motor system

The evaluation and interpretation of eigenvalue sensitivity for a speed-sensorless LCCSI-fed induction motor drive system are presented. It is well known that the sensitivity of the dynamic stability with respect to any parameter variations of the system matrix, A, can be characterized by the sensitivity of the eigenvalues with respect to the parameter variations. Based on a control system devised for stable operation of the LCCSI-induction motor system without a speed sensor, the eigenvalue sensitivity analysis corresponding to the three related control plants from open loop to closed loop is described. The eigenvalue sensitivity analysis clearly shows the possible sources of the system instability as well as comprehensive results against the system parameter variations over the nominal operating frequency range