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The reconfigurable computing method is applied for the vector control system structure of a tandem converter-fed induction motor operating in normal and failed conditions. The stator-field-oriented voltage control of the VSI working in tandem with a CSI is changed into rotor-field-oriented current control of the CSI supplying the motor alone if the VSI should be disconnected. The reconfiguration process introduces perturbations in the vector controlled AC drive. The paper analyses the perturbation effects based on simulation results. They were obtained with the help of a module library in MATLAB SIMULINK specially created for implementation into FPGA (field programmable gate arrays).