Efficiency optimized speed control system synthesis by optimal regulator theory - Application for separately-excited direct current motor system.:Application for Separately-Excited Direct Current Motor System

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This paper proposes new method to synthesize a robust speed control system for a separately-excited direct current motor system which attains maximum efficiency on the basis of an improved optimal regulator theory. In this method, the ratio of the armature current and the field current giving the maximum efficicncy of the DC motor system is analytically derived, and the error term for the current ratio is included in a quadratic performance index, together with the speed error term and the difference term of the control input variable. Therefore, the error term for the current ratio is strictly zero at the steady state, and the speed of transient response is arbitrary controlled to some extent by selecting the weights of the performance index. Then the control system which realized both the good response and the optimal ratio for the current giving the optimal efficiency with guaranteeing zero steady state error, is obtained in the systematic design procedure.In experimental results, good speed response is obtained. Also, considerable improvements on the efficiency at the steady state are obtained, compared with usual control method, in which only the armature impressed voltage is controlled while the field impressed voltage is kept constant, especially at the light load condition.
公益社団法人計測自動制御学会の論文