Research on an Improved Sliding Mode Sensorless Six-Phase PMSM Control Strategy Based on ESO

Abstract

The six-phase motor control system has low torque ripple, low harmonic content, and high reliability; therefore, it is suitable for electric vehicles, aerospace, and other applications requiring high power output and reliability. This study presents a superior sensorless control system for a six-phase permanent magnet synchronous motor (PMSM). The mathematical model of a PMSM in a stationary coordinate system is presented. The information of motor speed and position is obtained by using a sliding mode observer (SMO). As torque ripple and harmonic components affect the back electromotive force (BEMF) estimated value through the traditional SMO, the function of the frequency-variable tracker of the stator current (FVTSC) is used instead of the traditional switching function. By improving the SMO method, the BEMF is estimated independently, and its precision is maintained under startup or variable-speed states. In order to improve the estimation accuracy and resistance ability of the observer, the rotor position error was taken as the disturbance term, and the third-order extended state observer (ESO) was constructed to estimate the rotational speed and rotor position through the motor mechanical motion equation. Finally, the effectiveness of the method is verified by simulation and experiment results. The proposed control strategy can effectively improve the dynamic and static performance of PMSM.

Robust Control Design of a Human Heart Rate System for Cardiac Rehabilitation Exercise

“…Initially, sliding mode control (SMC) was derived for a specific dynamical system. SMC [21] is a variable structure control that utilizes a switching control law to alter the plant dynamics such that the plant states slide along the sliding surface [22][23][24][25][26][27][28][29][30][31][32]. SMC has two phases, which are the reaching phase and the sliding phase.…”

An Improved Super-Twisting High-Order Sliding Mode Observer for Sensorless Control of Permanent Magnet Synchronous Motor

“…A similar problem also appears in [26], where the SGN function is substituted with the smooth function of the angle error to weaken the chattering phenomenon. In [27], an improved SMO is applied to obtain rotor position and speed, in which the stator current frequency-variable tracker function is used instead of the switching function to reduce the influence of torque ripple and harmonic components on the back-EMF signals. A nonlinear observer method based on the adaptive sliding mode observer is presented, but the chattering problem still exists with the inclusion of the switching term [28].…”