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Abstract: This paper describes a new transmission line model for electromagnetic transient analysis in time domain which accounts for non-uniform and frequency dependence effects. This model is based on the Radulet approach to line equations and on finite differences in characteristic coordinates. The model is validated by comparisons with study cases reported in the specialized literature, as well as with the EMTP/ATP and the numerical laplace transform. [Copyright &y& Elsevier]

DC series motors are preferred for mechatronic applications requiring high torque/speed ratios. This paper describes the design and implementation of an open loop DC motor speed control that is based on a micro-controller and on IGBTs. Trial and error designs are expensive and time consuming. This problem is solved here by using simulation tools which can predict the dynamic behavior of systems consisting of mechanic and electronic modules. The simulations provided along the paper show a satisfactory agreement with laboratory measurements. [Copyright &y& Elsevier]