Effective and simplified method in maximum efficiency control of interior permanent magnet synchronous motors

In this study, an easily implementable and effective method in loss-minimisation control of interior permanent-magnet synchronous motors (IPMSMs) is proposed. Complication of loss-minimisation condition and its implementation are main problems in model-based control methods of IPMSMs. To resolve these problems, an approximate-model is used for simplification of loss-minimisation condition and a proportional-integral-controller is utilised to directly solve the loss-minimisation condition. Also, saturation and iron loss resistance variation due to frequency variation are considered in the proposed method. Furthermore, results show the high precision of the proposed method in comparison with accurate model. Steady-state performance of the proposed method is compared with look-up table-based loss-minimisation and maximum torque per ampere (MTPA) control methods. Also, experimental results verify performance, good dynamic response and effectiveness in loss reduction of the proposed method under different conditions in comparison with look-up table-based loss-minimisation and MTPA control methods.