Extended Internal Model Control Scheme for Sensorless Force Control on Uneven Surfaces

In this paper, an extended internal model control (IMC) scheme for a sensorless force control on an uneven surface is proposed to such kind of surface-polishing, deburring and rubbing machines. The IMC controller scheme has disturbance decoupling property, good tracking performance and disturbance estimation property. In order to extend the conventional IMC scheme to force control on uneven surfaces, we propose a novel control scheme based on the IMC scheme, and discuss stability of the closed-loop system. Moreover, effectiveness of the proposed IMC scheme is confirmed by comparative experiments.