Fuzzy Logic Controller Design Approach for Speed Control in Separately Excited DC Motors

This study presents a novel approach for speed control of a separately excited DC motor (SEDC), focused on controlling the field current. Typically, the parameter values and mathematical model of motors are key aspects to consider in the design of controllers, and the process of determining motor parameters is complex. However, designing the control system of fuzzy logic controllers (FLCs) does not require detailed parameters or mathematical models of the motor. Instead, this process relies on the expertise and experience of the designer. In this context, this study introduces an approach for designing the FLC for field current control in SEDC motor speed regulation, which can be applied to other SEDC motors irrespective of the designer's experience and expertise. The experimental results obtained upon comparing the proposed control approach between an FLC and PI controller show that better control closer to the reference speed is achieved in the FLC in both the transient and steady states. Furthermore, the proposed approach can be applied to SEDC motors with varying ratings.