In this contribution, a control scheme based on multi input multi output Fuzzy Sliding Mode control (MIMO-FSMC) for linear speed regulation of multi-motors system is proposed. Once the decoupled model of the multi-motors system is obtained, a smooth control function with a threshold was chosen to indicate how far the state from to the sliding surface is. However, the magnitude of this control function depends closely on the upper bound of uncertainties, and this generates chattering. So, this magnitude has to be chosen with great care to obtain high performances. Usually the upper bound of uncertainties is difficult to be known before motor operation, so, a Fuzzy Sliding Mode controller is investigated to solve this difficulty; a simple Fuzzy inference mechanism is used to reduce the chattering phenomenon by simple adjustments. A simulation study is carried out and shows that the proposed controller has great potential for use as an alternative to the conventional sliding mode control.

Keywords: Multi-Motors system, Fuzzy logic, Sliding mode control, MIMO