High inrush currents and unbalanced supply voltages are two of the major causes for failure of polyphase induction machines. While thyristor voltage controllers, sometimes called static starters, are in widespread use to limit damaging inrush currents, little attention has been paid to use of these controllers to balance the phases voltages of the machine. This project addresses the technical feasibility of unsymmetric control to limit unbalanced currents. A general case of unbalance is modelled in the ACSL program and will also be modelled on the analog computer. The controller adjusts two objective variables: constant positive sequence voltage and balance in rms current in all phases. Preliminary results show that a substantial reduction in losses is possible for general case of unbalance. The improvement obtained will be illustrated from the fundamental components of voltage and currents using Fourier Analysis.