Authors: I.Yu. Semykina, A.V. Tarnetskaya

Title of the article: The modern sensor-less methods of rotor position estimation of permanent-magnet synchronous motors at low speed

Year: 2017, Issue: 2, Pages: 126-132

Branch of knowledge: Electrical engineering

Index UDK: 681.518.22

DOI: -

Abstract: The capacity of permanent magnet synchronous motors (PMSM) applied at modern industrial plants incessantly increases. For example, implementation of such motors in electric drive systems of conveyor transport is on the rise. Mounting of permanent magnets on the rotor increases the electric drive efficiency but it makes the controllability difficult at start. Sensorless frequency-controlled electric drives are advisable for conveyor transport systems. However, modern sensorless vector control systems require high estimation accuracy of the standstill rotor position, because the permanent-magnet synchronous motor is controlled in function of the rotor position angle. Due to absence of back-EMF and flux linkages in the close to zero low speed, applying of traditional sensorless methods for PMSM is not possible. Modern researches suggest different sensorless methods for estimation of standstill rotor position. This article contains a brief description of these methods, its analysis and comparison. Finally, based on theoretical analysis there are conclusions about appropriateness of particular methods on sensorless vector control systems for PMSM.

Key words: standstill rotor position estimation permanent-magnet synchronous motor sensorless control methods high-frequency injection method PWM-method

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