On-Line Parameter Estimation Based Speed Control of PM AC Motor Drive in Flux Weakening Region

This paper presents a nonlinear controller based speed control of an interior permanent-magnet synchronous motor (IPMSM) over a wide speed range. The proposed controller incorporates both torque and flux controls with parameter estimation. The controller designed from standard linear d-q axis motor model with constant parameters leads to an unsatisfactory prediction of the performance of an interior permanent magnet motor owing to the magnetic saturation of these machines particularly, at high speed conditions. In this work, an adaptive backstepping based control technique has been developed for an IPMSM, wherein system parameter variations as well as field control was taken into account at the design stage of the controller. The proposed adaptive backstepping based high speed control of IPMSM drive has been successfully implemented in real time for a laboratory 1 hp IPMSM drive. The performance of the proposed drive is tested both in simulation and experiment at different operating conditions. The robustness of the controller and its prospective real-time industrial drive application is evidenced by the results