Maximum torque per ampere (MTPA) control scheme for buried magnet permanent magnet synchronous motor (PMSM) or internal permanent magnet (IPM) machine is presented in this paper. The proposed control scheme was developed based on measurement of only dc-link quantities eliminating the necessity of three-phase current feedback. The scheme employs an online search algorithm with initial condition computed from the a priori system information. Hybridization of a search-based algorithm with precomputed control coefficients ensures robustness against parameter variations while maintaining good dynamic performance.
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Ahmed et al. (2016) studied this question.
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