The present manuscript proposes a loss model controller (LMC) based on the Golden Section Search (GSS) algorithm for efficiency optimization of induction motor (IM) drives. The vector controlled or field-orientated induction motor (IM) drive system operates at rated flux in all the speed range. Even at low load, where the flux demand for IM operation is low, the drive is operated at rated flux and thus, unnecessarily energy is wasted. Therefore, to overcome this problem, the proposed algorithm searches for the optimal reference value of flux component of current (ds i) for which the electrical input power of the system should be minimal. The search algorithm is very fast and the algorithm has no effect on parameter variation and also no additional hardware machinery for hardware implementation is required. In addition, it does not require the knowledge of speed and torque in the searching process, and is insensitive to motor parameter variations. The simulation results for various speed patterns and operating conditions are presented in this paper. Stability study of the whole drive system is also carried out utilizing the optimizing scheme. The simulation results demonstrate the effectiveness of the proposed algorithm and also the experimental validation of same on dSPACE-1104 based laboratory prototype has confirmed the robustness of the proposed algorithm in terms of optimal efficiency.
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