Modeling and control of sugar cane crushing mill drove by electrical motors

The extracting performance of juice from sugar cane crushing mill affects the profitability of sugar cane factories. The extraction process is done through a series of mills that separate the juice From the cane fiber. To maximize their extraction to a specified milling ratio is required to control the driver speed and the chute level. This article presents nonlinear dynamic model based in physical laws for sugar cane crushing mill drove by electrical motors and the design of control strategies and their performance evaluation. From experimental tests, the parameters are obtained and the models are validated. A cascade control strategy is proposed for the mill and it is performance is compared by simulation with rapport to control strategies found in industry via indices for extraction and reliability. The proposed strategies are compared in a case study via simulation with a real strategy. The analysis shows that the cascade control strategy of torque, angular speed and chute level reaches the best performance. Copyright (C) 2009 CEA.