Adaptive composite disturbance observer based control for PMSM subject to multiple disturbances

This paper aims to investigate an adaptive composite disturbance observer based control (ACDOBC) approach for permanent magnet synchronous motors (PMSMs) subject to multiple disturbances, especially constant or slowly-varying disturbances and periodic disturbances. Different from most of the existing disturbance and uncertainty estimation and attenuation (DUEA) methods, a new adaptive mechanism is proposed in this paper for disturbance compensation. An adaptive composite disturbance observer (ACDO) is first employed to estimate the disturbances of multiple sources, even the periodic disturbances with unknown frequencies, a controller which contains a feedforward compensation item and a proportional feedback item is then employed to attenuate the disturbances. Simulation studies of the proposed method demonstrate the elegant tracking performance in the presence of multiple disturbances.