Sensorless velocity control for the series connected wound stator d.c. motor

Abstract A controller is designed to produce velocity trajectory following in a wound stator D.C. electric motor wired in a series configuration without the need for measurements of the mechanical states (i.e. sensorless control). The work represents a modification of a previously designed controller for the separately excited D.C. motor to address the more complicated problem of controlling the series connected motor. That is, a previous controller, which was designed in the framework of the observed integrator backstepping technique, is modified to reflect the peculiarities of the series connected motor dynamics. These modifications preclude a rigorous stability result; however, the control is validated through the use of a velocity tracking experiment on a commercial motor.

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