A Combined Position and Stator-Resistance Observer for Salient PMSM Drives: Design and Stability Analysis

Abstract

Abstract-A reduced-order position observer with statorresistance adaptation is proposed for motion-sensorless permanent-magnet synchronous motor drives. A general analytical solution for the stabilizing observer gain and stability conditions for the stator-resistance adaptation are derived. Under these conditions, the local stability of the position and stator-resistance estimation is guaranteed at every operating point except the zero frequency, if other motor parameters are known. Furthermore, the effect of inaccurate model parameters on the local stability of the position estimation is studied, and an observer gain design that makes the observer robust is proposed. The proposed observer is experimentally tested using a 2.2-kW motor drive; stable operation at very low speeds under different loading conditions is demonstrated.

Off-Line Parameter Identification of Permanent Magnet Synchronous Motor Using a Goertzel Algorithm

“…Also, T dead is the dead time and it was set 2 [μsec] [12]. The total impedance (Z) can obtain from the magnitude and the phases of the voltage and current in the Goertzel algorithm.…”

“…The high-frequency voltages are generated, and are injected into the d-and q-axes. Also, the injecting high-frequency voltages are analyzed to the Goertzel algorithm [5,12].…”

Аdaptive flux observer for permanent magnet synchronous motors

“…Более сложной задачей является рас-смотрение двигателя с неизотропным ротором (неидеальной цилиндрической формы) [17].…”

Dynamics and Stability of Permanent-Magnet Synchronous Motor

“…Li et al [8] deduced the smallsignal model of the open-loop control system of threephase PMSM, and the effect of speed, stator resistance, stator inductance, excitation magnetic linkage, moment of inertia, and load on the system stability is studied in detail by using stability criterion of eigenvalues of the state transition matrix in the linear system theory. Hinkkanen et al [9] proposed a reduced-order position observer with stator-resistance adaptation for motion sensorless permanent-magnet synchronous motor drives and the effect of inaccurate model parameters on the local stability of the position estimation is studied by analyzing the small-signal stability of the nonlinear estimation-error dynamics model. The stability of sensorless control of PMSMs (assume the position and the electromagnetic torque are known and the load is constant) are studied by making a strict Lyapunov function for the error system [10].…”