Efficiency and Performance Optimization of Induction Motor Drive

Induction Motor(IM) are known for its power/mass ratio, its efficiency, low cost and maintenance free performance during its life cycle therefore known as workhorses of industries. But huge amount of energy is wasted by IM due to their poor efficiency, also the operating cost is high. Therefore a small increment in efficiency may lead to contribute huge significant effect on the entire energy saving. The main key features in which estimation and reproduction of optimal flux component of current (Ids) depends, are loss model control (LMC) and search control (SC). To drive loss-minimization expression, core saturation is considered with d-q loss model of IM. Ids value expression for various load profiles, this loss expression is used to derive optimal Ids expression and tabulation is done. According to the table, a model is designed. The optimal Ids* value can be calculated, which depends upon run-time profile, followed by feed-forward manner and thus eliminates complex computation of run time loss model. Comparison is done between proposed operation that is optimal Ids and constant Ids obtained by conventional method. Increment of 1-12% efficiency is observed.