“…In the stability analysis novelty is importantly lies in the modelling of load disturbance of a current and delayed state vectors (Jeeva Sathya Theesar and Balasubramanian, 2013; Krishnan et al, 2017;Ramakrishnan and Ray, 2010Fang, 1998). To the best of author's knowledge, the delay-dependent stability analysis of DC motor speed control systems with non-linear load disturbance has not been reported in the literature so far (Almutairi et al, 2001;Ayasun, 2013;Barambones, 2012;Bayoumi and Salmeen, 2014;Chow and Tipsuwan, 2003;Hyalij et al, 2009;Lechappe et al, 2016;Li et al, 2008Li et al, , 2009Liu et al, 2006;Lukic et al, 2010;Malek, 2015;Narayan and Kumar, 2013;Park et al, 2011;Santosh Kiran et al, 2015;Sharmila and Devarajan, 2010;Sipahi and Nia, 2014;Sonmez and Ayasun, 2016;Suh et al, 2005). There are two category of feedback delays are investigated for stability analysis: timevarying delay and time-invariant delays (Jiang et al, 2012;.…”