Design and implementation of a nonlinear controller and observer for inverter fed permanent magnet synchronous motor drive using dSPACE DS1103 controller board

This paper proposes a control system for the speed control of permanent magnet synchronous motor (PMSM) drive through hardware implementation using dSPACE DS1103 controller board. The proposed control scheme consists of two loops such as the inner current loop and outer speed loop. In the inner current loop a nonlinear full order observer (NFOO) along with the state feedback controller (SFC) is used; whereas in outer speed loop PI controller is used as speed controller. The proposed NFOO estimates all the states of PMSM and fed back to the SFC. A nonlinear controller (NLC) is designed along with SFC, to cancel out the system nonlinearity using the concept of exact feedback linearisation. Also the pole placement technique is implemented in order to shift all the poles to left half of the s-plane resulting the system stable in spite of uncertainties and parameter imperfections. The speed and position information of the PMSM is obtained using an encoder. The proposed control scheme has been extensively simulated under various conditions and verified experimentally through dSPACE DS1103 controller.