Wide-Range Sensorless Control for SPMSM Using an Improved Full-Order Flux Observer

Abstract

A sensorless control method was recently investigated in the robot and automation industry. This method can solve problems related to the rise of manufacturing costs and system volume. In a vector control method, the rotor position estimated in the sensorless control method is generally used. This study is based on a conventional full-order flux observer. The proposed full-order flux observer estimates both currents and fluxes. Estimated d-and q-axis currents and fluxes are used to estimate the rotor position. In selecting the gains, the proposed full-order flux observer substitutes gain k for the speed information in the denominator of the gain for fast convergence. Therefore, accurate speed control in a low-speed region can be obtained because gains do not influence the estimation of the rotor position. The stability of the proposed full-order flux observer is confirmed through a root-locus method, and the validity of the proposed observer is experimentally verified using a surface permanent-magnet synchronous motor.

Simple Sensorless Control of Interior Permanent Magnet Synchronous Motor Using PLL Based on Extended EMF

“…The error of the rotor position can be defined as follows (12) (12) A block diagram for estimating the rotor position is shown in Fig. 3.…”

“…Because of the additional circuit, the total system becomes more expensive and mechanically voluminous [5,6]. Therefore, various control methods for the IPMSM have been researched to detect the rotor position without a sensor [7][8][9][10][11][12][13].…”

Rotor position estimation over entire speed range of interior permanent magnet synchronous motors

“…However, the use of such sensors requires additional expenses, space, and continuous maintenance of the system. Thus, several rotor position and speed estimation methods have been proposed to address these issues [9][10][11][12].…”