REDUCTION OF DC TRACTION MOTOR ARMATURE COPPER LOSSES THROUGH OPTIMAL CONTROL

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Abstract
An optimal control that minimizes energy dissipated as armature copper losses for a thyristor converter powered DC drive motor subjected to acceleration under conditions of constant field excitation is presented. Pontryagin's Maximum Principle is employed in the control derivation. A closed-form expression for the optimal control in terms of system parameters is found. Effectiveness of the control to reduce losses is demonstrated through example. In addition, nature of armature current and motor speed resulting from application of the optimal control are examined. Design trade-offs and implementation techniques are explored.

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