Abstract
This paper investigates the design and implementation of nonlinear control schemes for a separately excited DC motor operating in the field-weakening region. A feedback linearization controller, a Corless-Leitman-type controller, and two nonlinear controllers are designed and implemented for a DC motor system. The stability of the closed-loop system is proved using Lyapunov theory. A hardware testbed is constructed to experimentally verify the designed controllers. The hardware consists of a DC motor system, a DSP controller board, a power module, two current sensors, and a tachogenerator. The experimental results indicate that the developed controllers work well.
Highlights
DC motors are used in a huge number of industrial applications
This paper investigates the design and implementation of nonlinear control schemes for a separately excited DC motor operating in the field-weakening region
This paper uses four nonlinear techniques to control a separately excited DC motor operating in the field-weakening region
Summary
DC motors are used in a huge number of industrial applications. Separately excited DC motors have many applications. The operation of separately excited DC motors is as follows. Field coils are used to establish an air-gap flux between stationary iron poles and the rotating armature which has axially directed conductors that are connected to a brush commutator; these conductors are continuously switched such that those located under a pole carry directed currents. The interaction of axially directed currents and radially directed field flux produces a shaft torque. DC motors and drives generally contain nonlinear relations that are difficult to model. In a number of cases, even when the available model is accurate, the exact system parameters are difficult to measure or estimate. In conjunction with improved power electronics and fast digital signal processing tools, can be used to overcome the nonlinearity of the system and to ensure that the system behaves in the desired manner
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