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Permanent Magnet Synchronous Motors (PMSMs) are prone to instability when operated open loop in variable speed drives. This paper presents a real-time control strategy based on Adaptive Neural Networks (ANN) for efficiency optimisation of a previously reported drive system incorporating a high-field PMSM. Stability constraints of the drive system are used by the proposed controller to maintain both stable and highly efficient operation irrespective of load and supply variations. The obtained results from computer simulation are found in correlation with previously reported experiments and observations.