Disturbance observer based sensorless speed controller for PMSM with improved robustness against load torque variation

Lee, Kooksun; Choy, Ick; Back, Juhoon; Choi, Ju-Yeop

doi:10.1109/icpe.2011.5944734

Cited by 7 publications

(7 citation statements)

References 18 publications

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“…When the system enters the sliding surface, the observer speed ωe will converge to the real value, ω e , and ωe = ω e . At this time, Equation ( 9) can be simplified into Equation (10)…”

Section: Traditional Second-order Smo Of Ipmsmmentioning

confidence: 99%

“…The sliding mode observer (SMO)-based control is one of the most conventional methods for the medium and high speed sensorless control [9,10]. SMO has the advantage of strong robustness to interference and insensitivity to the system parameter variations [11].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, due to electromagnetic and mechanical errors, temperature changes, and nonlinearities of the driving inverter, there are many harmonics in estimating back-electromotive force (back-EMF) [9][10][11][12]. These harmonics affect the accuracy of the rotor position and speed estimation.…”

Section: Introductionmentioning

confidence: 99%

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Full-Order Sliding Mode Observer Based on Synchronous Frequency Tracking Filter for High-Speed Interior PMSM Sensorless Drives

Bao

Wang

et al. 2020

Energies

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In the research of the high-speed sensorless control strategy of an interior permanent-magnet synchronous motor (IPMSM), considering the harmonic influence of inverter nonlinearity on traditional sliding mode observer method, a full-order sliding mode observer (SMO) method based on synchronous frequency tracking filtering is proposed. This method avoids the phase delay defects caused by the use of filters in traditional second-order SMO. Then, the observed extended electromotive force (EMF) signal is filtered using a synchronous frequency tracking (SFT) function. It tracks the changing stator current and filters out harmonics that are not part of the tracking signal to achieve static tracking of the stator current. Then, the rotor speed can be estimated by a Luenberger-based observer. Experimental results verify the effectiveness and feasibility of the proposed method.

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Section: Traditional Second-order Smo Of Ipmsmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Full-Order Sliding Mode Observer Based on Synchronous Frequency Tracking Filter for High-Speed Interior PMSM Sensorless Drives

Bao

Wang

et al. 2020

Energies

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“…For stable observation of the disturbance torque, an accurate speed measurement with minimum time delay is essential. In sensorless systems, estimated speed can be directly used to compensate the disturbance torque [16][17][18]. A disturbance observer in a sensorless system was proposed in [19].…”

Section: Introductionmentioning

confidence: 99%

Motion control of the rail traction system by dual brushless AC motors using a disturbance observer

Lee

2021

IET Electric Power Appl

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This study presents an accurate motion control scheme using a modified non-linear disturbance torque observer for a rail traction system driven by a dual brushless AC (BLAC) motor. The target application has two BLAC motors mounted on the top surface of the rail. The mover translation along the rail is handled solely by the traction motors without any external sensor. In the low-speed range, however, the conventional disturbance torque observer is unstable due to the resolution of the Hall sensor and speed detection delay. To solve this instability problem, a simple weight function with the synchronisation of torque current and the delayed speed feedback is added to the proposed torque observer. This way, zero output can be created in the selected speed region for stabilisation and torque current can be compensated. Furthermore, simple balance error compensation to synchronise both motors is added to the proposed speed and position model reference adaptive control scheme. The experiments were performed to verify the proposed control method. The results show advanced performance with reduced position and balance errors between the two BLAC motors and an improved overall control performance of the rail mover.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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“…Sensorless control based on the disturbance observer has been studied in [22][23][24][25]. Furthermore, a considerable amount of research has been devoted to improve load torque robustness for PMSM systems with mechanical sensors [26][27][28] as well as their sensorless counterparts [29]. However, the effect of the speed estimation error on torque disturbance rejection and systematic performance in sensorless methods has largely been ignored.…”

Section: Introductionmentioning

confidence: 99%

Load disturbance observer‐based control method for sensorless PMSM drive

Xiaoquan

Lin

Junlin

2016

IET Electric Power Applications

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This study proposes a sensorless control method for the permanent magnet synchronous machine (PMSM) drive that is robust against load torque variations. The proposed method is based on the disturbance observer-based control (DOBC) method, and involves the use of a back electromotive force observer and a torque observer to estimate rotor position and compensate for load torque disturbance, respectively. This mechanism is simple to implement and requires no state vector derivation. The gains of the two observers are carefully selected to improve estimation accuracy and dynamic performance. The performance of the proposed load DOBC for sensorless PMSM drives was tested through a simulation, where the sensorless estimation error was considered to determine the adjustment laws for the proposed observer gains. Furthermore, results of evaluative experiments verified the effectiveness of the proposed method for high-performance sensorless control and torque disturbance rejection for the PMSM drive.

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Disturbance observer based sensorless speed controller for PMSM with improved robustness against load torque variation

Cited by 7 publications

References 18 publications

Full-Order Sliding Mode Observer Based on Synchronous Frequency Tracking Filter for High-Speed Interior PMSM Sensorless Drives

Full-Order Sliding Mode Observer Based on Synchronous Frequency Tracking Filter for High-Speed Interior PMSM Sensorless Drives

Motion control of the rail traction system by dual brushless AC motors using a disturbance observer

Load disturbance observer‐based control method for sensorless PMSM drive

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