An Application of a Finite Element Controller Map for Speed Control for Saturated Induction Motors

A novel Finite Element Controller Map (FECM) method for the speed control of a saturated induction motor (IM) drive is presented in this paper. The newly developed algorithm is based on approximate functions in finite elements, which are expressed according to the nodal values of output response of the IM drive. The map complexity depends on the nodes assigned within a discrete element. The proposed FECM improves dynamic responses, and is designed by assigning a simple shape function to avoid computational burden. The complete controller scheme incorporating the FECM algorithm for an IM drive is developed in MAT LAB/Simulink. The proposed FECM algorithm is experimentally implemented in real time using a DSP-DS1104 control board for a laboratory induction motor. The simulated performances of the proposed FECM are found to be not very sensitive to parameter variations. These simulation results are investigated and compared with a conventional PI controller, when they are subjected to changes to command speed and parameters variation, particularly at low speeds. The simulation and experimental results are provided to verify the effectiveness of the proposed control strategy.