Two-Stage Control Design of a Buck ConverterDC Motor System without Velocity Measurements via aΣ−Δ-Modulator

Abstract EN

This paper presents a two-stage control design for the “Buck power converter/DC motor”system, which allows to perform the sensorless angular velocity trajectory tracking task.

Thedifferential flatness property of the DC-motor model is exploited in order to propose a first-stagecontroller, which is designed to achieve the desired angular velocity trajectory.

Thiscontroller provides the voltage profiles that must be tracked by the Buck converter.

Then,a second-stage controller is meant to assure the aforementioned.

This controller is based onflatness property of the Buck power converter model, which provides the input voltage to theDC motor.

Due to the fact that the two-stage controller proposed uses the average model ofthe system, as a practical and effective implementation of this controller, a Σ − Δ-modulator is employed.

Finally, in order to verify the control performance of this approach, numericalsimulations are included.