Browsing by Author "AL-GBURI, KHALID"
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Item DESIGN AND IMPLEMENTATION: ANALOG AND DIGITAL CONTROL SYSTEM FOR SEPARATELY EXITED DIRECT CURRENT MACHINE(2022-02-28) AL-GBURI, KHALID; Doruk, Reşat ÖzgürIn this thesis, we will perform a design and implementation of a closed loop PI control system for a separately excited direct current motor. The design is first implemented in the continuous time domain (or s-plane) and then it is converted into digital domain (z plane) The stability of the closed loop is analyzed in both domains including different values of the sampling time. The design procedure is separated into two parts. First of all, a field current PI controller is established. This controller should be sufficiently fast so that the nonlinear motor model can behave linearly. The second part involves the control of motor speed using again a PI controller. Here linear techniques will be applied, assuming that we have a constant field current set of field current control. The tuning of the proportional and integral (PI) controller gains will be tuned for the two different controllers and we evaluate different gains combinations to obtain a closed loop response of the overall system to achieve an acceptable level of performance. Upon finishing the continuous time designs, we implement the digital equivalents by transforming the controllers and plant into the digital domain. The performance of the closed loop is assessed by numerical simulations. The simulation is performed in linear and nonlinear domains. Nonlinear simulation involves, both field current and speed controllers working together on the actual nonlinear model of the DC motor. MATLAB is the simulation and computation environment.