SMO-Based Sensorless Control of a Permanent Magnet Synchronous Motor

Abstract

In order to reduce the chattering caused by the discontinuity of the control function in the traditional sliding mode observer (SMO), this article proposes a sliding mode observer with phase-locked loop (PLL) to estimate the speed and position of the rotor. The back electromotive force (EMF) of a permanent magnet synchronous motor (PMSM) in a static coordinate system is accurately estimated by SMO, and then, PLL is constructed to combine the observed rotor position angle and back EMF to compensate the phase lag in angle estimation so as to obtain a more accurate speed. It solves the problems of poor robustness and complex algorithms in the traditional SMO prediction algorithm. The simulation results show that the SMO with PLL can effectively reduce the system chattering and effectively improve the accuracy of rotor speed and position estimation.

PMSM sensorless control based on sliding mode control with fuzzy variable gain STA-SMO

“…The feasibility and effectiveness of the proposed control system are verified by simulations under different conditions and finally by physical experiments. [9][10][11][12]…”

Simultaneous Estimation of Current and Speed of Permanent Magnet Synchronous Motor Based on an Improved Dual Second-Order Observer

“…As a robot joint, its use usually involves calculating the torque reference value based on the error between the reference speed and the actual measured speed, which requires a high-frequency calculation of the motor speed [6]. For the controller without a speed sensor and using the position information fed back by the encoder to calculate the speed, high measurement noise will be injected into the current loop, resulting in a large torque ripple [7]. It can be reduced by reducing the current and angle sensor noise, thereby achieving a higher precision force control.…”

“…SMO is insensitive to the changes of the model parameters and has strong robustness [7]. Some scholars have designed a full order slip film observer to estimate the flux and speed of the motor at the same time [11,12], in order to enhance the disturbance suppression ability of the speed loop.…”

Adaptive fault-tolerant control of five-phase permanent magnet synchronous motor current using chaotic-particle swarm optimization

“…The five-phase permanent magnet synchronous motor has the advantages of low torque ripple, multiple control degrees of freedom, and high efficiency (Liu et al (2022); Zhang et al (2021); Zhao et al (2022)). It can achieve fault-tolerant operation without additional hardware support.…”