Abstract
A general modelling of d.c. motor fed by static converter is proposed using matrix transformation and specific functions. The application proposed concerns a single phase converter which imposes discontinuous current flow through a d.c. motor. The digital controller consists of proportional-integral controller for the speed and a special integral one for the current. The recurrence matrix for small perturbations may be explicitly written by the use of the general modelling method so that the controller parameters can be calculated for any required behaviour. To check the results, a program of simulation, based on Runge-Kutta numerical method, is made directly from the differential equations describing the systems in different modes of operation and the digital controller equations whose parameters are calculated from the proposed model.
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