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Determining the observer parameters for back EMF estimation for selected types of electrical motors

Urbanski K.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2017

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Vol. 65, nr 4

439--447

EN

In the paper a procedure for determining the observer parameters for selected types of electrical motors is discussed. The procedure is based on the identity observer developed by Luenberger. The paper presents determining the parameters using calculation examples for the DC motor and also for the permanent magnet synchronous motor (PMSM), which utilize the extended state vector to estimate the back electromotive force (BEMF). Presented observer for PMSM does not need to use the information about load torque. The main task of this study is to show how to utilize these general theory to a specified type of motors. Such procedure avoids the use of time-consuming methods of the parameters selection, which are based on random algorithms or the computational intelligence.

2

A new sensorless speed control structure for PMSM using reference model

Urbanski K.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2017

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Vol. 65, nr 4

489--496

EN

In the paper a new sensorless control structure for the PMSM drive is presented. Such a structure is especially recommended for speed in the range of single revolutions per second (excluding standstill). The method uses a back EMF observer for position estimation. However, there is no need to estimate the speed. This is a big advantage because of possible irregularity of estimated back EMF in this speed range, which makes the calculation of speed difficult or impossible. The proposed structure is similar to the model following control, but the reference model attempts to track the motor operating point. The main idea is to utilize as a reference a model of the whole drive, including speed and current controllers and motor model. Such a model produces reference voltage for the real inverter. However, an extra unit – called rotator – is needed to provide precise control of direct axis current, which is sensitive to the improper position of the voltage vector. The rotator acts as a kind of compensator for error of position estimation.

3

Position estimation for PMSM drive equipped with the motor choke

Urbanski K.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 4

237-241

EN

The paper presents results of studies on the sensorless drive with permanent magnet synchronous motor (PMSM) supplied through the motor choke. The position is estimated using a modified Luenberger observer. Its modification consists in using a PII2 correction function instead a proportional one, which gives smaller estimation errors. The advantages of that observer structure are simple structure and the good performance of the drive despite the fact that the presence of the choke was not taken into account in the observer structure.

PL

W artykule przedstawiono wyniki badań napędu bezczujnikowego z silnikiem synchronicznym o magnesach trwałych zasilanego poprzez dławik silnikowy. Wykorzystano zmodyfikowany obserwator Luenbergera. Modyfikacja polega na rozbudowie funkcji korekcji o dodatkowe integratory – co wpływa m.in. na zmniejszenie błędu odtwarzania położenia. Istotną cechą takiego obserwatora jest możliwość pracy napędu bez uwzględnienia w strukturze obserwatora obecności dławika w torze zasilania.