Novel on-line optimal bandwidth search and auto tuning techniques for servo motor drives

The main theme of this paper is to propose fast on-line optimal bandwidth search and controller tuning techniques for servo motor drives. The proposed controller tuning method derives the controller gains by searching the optimal bandwidth and identifying the inertia. The optimal bandwidth can be achieved before oscillation occurs. It will be shown the gains of speed controller of servo drives are tuned automatically to reflect the variation of load inertia. Experimental results derived from DSP-controlled PMSM servo drives will be shown. The results demonstrate on-line optimal bandwidth and auto gain tuning can be achieved without motor and load information in prior. These results fully support the developed techniques and claims.