Resumen

RAMIREZ-BETANCOUR, Reymundo et al. Speed control of a DC motor based on armature current measurement. Ing. invest. y tecnol. [online]. 2018, vol.19, n.4, e039. ISSN 2594-0732.  https://doi.org/10.22201/fi.25940732e.2018.19n4.039.

In this paper a speed controller for Direct Current (DC) motors without dependence of mechanical sensors (encoders) is proposed. The controller is based on real time estimation strategies and indirect measurements. For this, the induced current is employed as only available electrical variable. Therefore, the correct instrumentation of the data acquisition process is very importance to ensure that the measurements correspond to the real value. The estimation process is carried out in two main stages, in a first stage the sliding mode observer technique is used for estimate the electric motor torque. The second stage uses the pole placement observer design. The classical proportional-integral (PI) control law on combination with the state feedback are used to carry out the control actions. The controller validation is realized by means of digital simulations and real-time experimental tests using a separately excited DC motor. The workbench implementation consists of a DSP acquisition and control board, a CD-CD electronic converter, an electric current measure instrumentation board and a PC computer. The power delivered to the CD motor is handled through CD-CD converter based on PWM technique. The motor speed shows an asymptotically stable behavior to changes in load torque and reference speed values. The tests results demonstrate the robustness, the precision and the speed convergence of the proposed control.

Palabras llave : Speed control; DC motor; state observer; current sensor; proportional integral.

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