“…In effect, for technological reasons, the inputs for such systems are generally binary electrical signals; that is, they are naturally discontinuous. For more theoretical and practical descriptions the reader is invited to refer to some standard textbooks and articles on the subject, such as (Guldner et al, 1999), (Floquet at al., 2000), (Shyu and Lai, 2002), (Sira Ramirez and Ngai 2001), (Djemai andBarbot, 1999 and, (Levant, 1998), (Emel'yanov et al, 1986), (Fridman and Levant, 1996), (Barbot, and Perruquetti, 2002), (Defoort et al, 2009) and (Laghrouch et al, 2007) just to mention a few. From a practical point of view, the control algorithms for electric drives are generally implemented via power converters using pulse width modulation (PWM).…”