Towards minimum variance and robustness controller for LTI system demonstrated on a permanent field DC-motor

We present in this paper an experimental testing for a new algorithm that calculates a controller´s coefficients for output variance minimization related to Linear Time Invariant (LTI) Systems. The algorithm features simplicity in calculation, generalization to minimal and non-minimal phase systems. An experiment of DC-motor velocity feedback control demonstrates robustness characteristics for the new developed controller based on the proposed algorithm. Results show that for an identified ARMAX model for the DC motor model without taking account the variance of the identified coefficients, the controller manage to achieve minimum variance.