An improved speed and position estimator for salient permanent-magnet synchronous motors
Artikel i vetenskaplig tidskrift, 2005

In this paper, an improved phase-locked-loop-type speed and position estimator for permanent-magnet synchronous motor (PMSM) drives is considered. Particular attention is put on salient-rotor PMSMs with fast mechanical dynamics. A method is presented, whereby significantly improved tracking is achieved. While saliency makes nominal-speed stability more difficult to guarantee (an analysis of this is presented), a benefit is that signal-injection methods can be used at low speeds for accurate position estimation, which is also included in the modified estimator.

speed estimation

signal injection

Permanent-magnet synchronous motor

sensorless control

phase-locked loop

position estimation


Oskar Wallmark

Chalmers, Energi och miljö, Elkraftteknik

Lennart Harnefors

Ola Carlson

Chalmers, Energi och miljö, Elkraftteknik

IEEE Transactions on Industrial Electronics

Vol. 52 1 255-262


Elektroteknik och elektronik

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