Nonlinear efficiency optimization control of IPM synchronous motor drives with online parameter estimation

This paper describes an efficiency optimization control method for high performance interior permanent magnet synchronous motor drives with online estimation of motor parameters. The control method is based on an input-output feedback linearization which sets force the speed control of the motor drives and simultaneously ensures the minimization of the motor losses. The controllable electrical loss can be minimized by an optimal control of the armature current vector. A stability study based on the second method of Lyapunov guarantees the stability and convergence of the estimated parameters under certain conditions. The simulation results show the feasibility of the control method and desirable motor performance under the proposed controller and observer.