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Sensorless Control of a Permanent Magnet Synchronous Motor
Linköping University, Department of Electrical Engineering.
2009 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

A permanent magnet synchronous motor is traditionally controlled from measured

values of the angular velocity and position of the rotor. However, there is a wish

from SAAB Avitronics to investigate the possibility of estimating this angular

velocity and position from the current measurements. The rotating rotor will

affect the currents in the motor’s stator depending on the rotor’s angular velocity,

and the observer estimates the angular velocity and angular position from this


There are several methods proposed in the article database IEEE Xplore to

observe this angular velocity and angular position. The methods of observation

chosen for study in this thesis are the extended Kalman filter and a phase locked

loop algorithm based on the back electro motive force augmented by an injection

method at low velocities.

The extended Kalman filter was also programmed to be run on a digital signal

processor in SAAB Avitronics’ developing hardware. The extended Kalman filter

performs well in simulations and shows promise in hardware implementation. The

algorithm for hardware implementation suffers from poor resolution in calculations

involving the covariance matrices of the Kalman filter due to the use of 16-bit

integers, yielding an observer that only functions in certain conditions.

As simulations with 32-bit integer algorithm performs well it is likely that a 32-

bit implementation of the extended Kalman filter would perform well on a motor,

making sensorless control possible in a wide range of operations.

Place, publisher, year, edition, pages
2009. , 74 p.
Keyword [en]
Extended Kalman Filter, Non-linear Observer, Permanent Magnet Synchronous
National Category
Control Engineering
URN: urn:nbn:se:liu:diva-17313ISRN: LITH-ISY-EX--09/4186--SEOAI: diva2:208355
Glashuset, Linköpings Universitet, Linköping (Swedish)
Available from: 2009-03-18 Created: 2009-03-17 Last updated: 2009-03-18Bibliographically approved

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