Identification and Fuzzy-PI Controller Design for a Novel Claw Pole Eddy Current dynamometer in Wide Speed Range

One of the essential tools in motor tests, especially in high speeds, is access to variable load torque. Eddy current dynamometer (ECD) system, using a variable field, provides different load torque with respect to excitation current. This paper investigates on modeling and controller design for a novel claw pole ECD that is employed to be a variable load torque in DC type counter rotating motor (CRM). DC motors under investigation of this paper consist of inner and outer shaft rotating in different directions that are suitable in under water propulsion applications. To design an accurate controller, achieving to an exact dynamical and parametric model of ECD is necessary. To realize this aim, the state space model of the ECD is identified at low speed range. After that, we use experimental data to determine torque-speed characteristic, which is used in parametric model, in wide speed range. The control strategy of this paper is PI controller adjusted by fuzzy system. Subsequently, using MATLAB simulation results, comparison between PI and fuzzy-PI proves better performance of fuzzy-PI controller