Sensorless control of PMSM fed through the sinusoidal filter

2015

COMPEL

Self Cite

Purpose -The purpose of this paper is to develop the Permanent Magnet Synchronous Motors drive which has possibility to work in sensorless mode at low speed based on back EMFs estimation. Design/methodology/approach -Estimation uses modified Luenberger observer and the preprocessing of the EMFs before calculating the speed, using derivative and the Kalman filter (KF) to obtain smooth waveform of the estimated speed. This modification is needed because of the nonlinear change of the estimated back EMFs amplitude as a function of speed, in low-speed range. Findings -How to use back EMF observer to estimate a speed in the low-speed range was found in the course of the work. Simple and effective algorithm uses KF and can work even with a relatively big deformation of the estimated back EMF. Practical implications -Such sensorless drive may be used in low-cost constant or variable speed drive in domestic use or industrial application. Such drive may work properly where there is no initial load torque and the sign of the speed does not change. Originality/value -Presented results challenge the view that at low-speed range (not the standstill), the back EMF-based method of position estimation is very difficult or impossible. However, the problem lays in proper speed estimation, not the position estimation.

Section: Position Estimationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sensorless control of PMSM for low speed range

2015

COMPEL

Self Cite

“…In order to control the drive systems for the non-zero speed range, different methods for estimating the shaft position are used [21,22,23,24,25,26,27], including the Luenberger observer [17], the modified Luenberger observer (with multiple integrator) [24], and the above-mentioned Kalman filter [25]. In the case of sensorless drives in the low-speed range (assuming the following distinction for sensorless operation: low speed, the speed of a single revolution per second; very low speed, the speed of a single revolution per minute), it is usually assumed that the methods based on estimating the electromotive forces do not work properly [22,26,27].…”

Section: Introductionmentioning

confidence: 99%

Sensorless Control of the Permanent Magnet Synchronous Motor

Janiszewski

2019

Sensors

Self Cite

This paper describes the study and experimental verification of sensorless control of permanent magnet synchronous motors with a high precision drive using two novel estimation methods. All the studies of the modified Luenberger observer, reference model, and unscented Kalman filter are presented with algorithm details. The main part determines trials with a full range of reference speeds with a special near-zero speed area taken into account. In order to compare the estimation performances of the observers, both are designed for the same motor and control system and run in the same environment. The experimental results indicate that the presented methods are capable of tracking the actual values of speed and motor position with small deviation, sufficient for precise control.

“…Reliable operation without sensor is still a subject of investigations. The actual investigations are mainly focused on: zero speed range [1][2][3][4], high dynamic performance [5,6], motor supplied through choke or LC filter [7][8][9] and supplied by matrix converter [1,10]. Various approaches to the sensorless control are applied: using signal injections (typical application is zero speed range), based on back EMF estimation -including continuous observer of the kind which is presented in the paper and sliding mode based observers [11], based on Kalman filter [12,13], an adaptive interconnected observer [14] and the use of the artificial neural networks [15,16].…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Improved Method for Position Estimation Using a Two-Dimensional Scheduling Array

Zawirski

2015

Automatika

Self Cite

Original scientific paperThe paper presents results of studies on the position estimation for the permanent magnet synchronous motor (PMSM) drive using gain scheduling technique for tuning the observer's parameters. It allows a good estimation accuracy in wide range of working point change. Such observer with multi integral correction function improves the performance, but need to modify its parameters according to its speed and load.Novelty is the use of a two-dimensional gain scheduling technique and the use in the sensorless drive, where traditional solution is simple one-input scheduling variable -mainly on drives with position sensors. The look-up table output is processed using bilinear interpolation. Position observer is based on back EMF estimation. It uses predefined reference matrices of parameters, which are interpolated and depend on drive's operating point.Key words: Observers, PMSM, Scheduling, Sensorless control, Variable speed drives Unaprijeđena metoda estimacije položaja zasnovana na upotrebi dvodimenzionalnog polja za ažuriranje parametara. U radu su predstavljeni rezultati studija vezanih za estimaciju položaja sinkronog motora s permanentnim magnetima (PMSM) uz korištenje regulatora s podesivim pojačanjem za adaptaciju parametara estimatora. Metoda pokazuje dobru točnost estimacije u širokom rasponu radnog područja. Ovakav estimator s više integracijskih korekcijskih funkcija poboljšava performanse, ali i zahtijeva adaptaciju parametara ovisno o brzini i teretu.Novost predstavlja korištenje dvodimenzionalnog podešavanja pojačanja regulatora te primjena u bezsenzorskom upravljanju elektromotornim pogonom, gdje se tradicionalno koristi jednostavno ažuriranje jedne varijable -prije svega kod elektromotornih pogona sa senzorom za poziciju. Pregledna tablica izlaza koristi se uz bilinearnu interpolaciju. Estimator položaja zasnovan je na estimaciji protuelektromotorne sile. Estimator koristi unaprijed određene referentne matrice parametara koje se interpoliraju te ovise o radnoj točki.Ključne riječi: Estimatori, PMSM, ažuriranje parametara, bezsenzorsko upravljanje, elektromotorni pogon promjenjive brzine INTRODUCTIONThe Permanent Magnet Synchronous Motor (PMSM) is very often used type of motor in industrial applications. Its the most significant advantages are high power density, high torque-to-inertia ratio and small torque ripples. Such drive gives possibility to precise speed and position control at low speed range, a torque control at zero speed and has compact size. A typical control structure of PMSM drive bases on vector control method. It allows to get a good dynamics, effective performance especially during transient processes and prevents overload of the motor by controlling the torque. However, a motor shaft position sensor is required to enable the effective control of the drive. Reliable operation without sensor is still a subject of investigations. The actual investigations are mainly focused on: zero speed range [1][2][3][4], high dynamic performance [5,6], motor supplied through ...