Dynamic Properties of Back-emf Based Sensorless Drives

This paper investigates the speed sensitivity of back-emf based sensorless techniques for PM machines. The eigenvalues of the back-emf based estimation are speed dependent leading to performance degradation including reduced command tracking and disturbance rejection. At low speeds, it is shown that...

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Bibliographic Details
Main Authors: de S Ribeiro, L.A., Harke, M.C., Lorenz, R.D.
Format: Conference Proceeding
Language:English
Subjects:
Costs
Degradation
Drives
Magnetic analysis
Permanent magnets
PM machines
Power system reliability
Sensorless control
sensorless drives
Signal to noise ratio
speed estimation
Stators
Torque
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Summary:This paper investigates the speed sensitivity of back-emf based sensorless techniques for PM machines. The eigenvalues of the back-emf based estimation are speed dependent leading to performance degradation including reduced command tracking and disturbance rejection. At low speeds, it is shown that instability occur. The paper analyzes an operating point model of the permanent magnet synchronous machine for both sensor- and sensorless-based torque and position/velocity control. The sensorless techniques investigated include state filter-based and zero phase-lag observer-based approaches. In order to maintain disturbance rejection, the sensorless drives must operate at speeds significantly higher than the stability limit
ISSN:0197-2618
2576-702X
DOI:10.1109/IAS.2006.256814