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Comput."],"published-print":{"date-parts":[[2017,1]]},"abstract":"<jats:p>We consider a nonlinear optimization problem governed by partial differential equations with uncertain parameters. It is addressed by a robust worst case formulation. The resulting optimization problem is of bilevel structure and is difficult to treat numerically. We propose an approximate robust formulation that employs linear and quadratic approximations. To speed up the computation, reduced order models based on proper orthogonal decomposition in combination with a posteriori error estimators are developed. The proposed strategy is then applied to the optimal placement of a permanent magnet in the rotor of a synchronous machine with moving rotor. 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