A new sensorless control method for a general class of linear pulse motors

This paper describes a sliding-mode type observer to identify the rotor position and velocity of a hybrid-type linear pulse motor (LPM). Since the observer error dynamics of a hybrid-type LPM are highly nonlinear, the performance of the proposed observer is analyzed using an approximated error model. The optimal choices of the proposed observer gains are also discussed. The authors' extensive simulation study shows that the proposed observer can identify rotor position and velocity within 3% and is quite robust with respect to uncertainties in the system model, including mechanical parameters and load force.