Synchronization at startup and stable rotation reversal of sensorless nonsalient PMSM drives
Jansson, M.; Harnefors, L.; Wallmark, O.; Leksell, M.
Industrial Electronics, IEEE Transactions on
Volume 53, Issue 2, April 2006 Page(s): 379 - 387
Digital Object Identifier   10.1109/TIE.2006.870731
Summary: In this paper, a variant of the well-known "voltage model" is applied to rotor position estimation for sensorless control of nonsalient permanent-magnet synchronous motors (PMSMs). Particular focus is on a low-speed operation. It is shown that a guaranteed synchronization from any initial rotor position and stable reversal of rotation can be accomplished, in both cases under load. Stable rotation reversal is accomplished by making the estimator insensitive to the stator resistance. It is also shown that the closed-loop speed dynamics are similar to those of a sensored drive for speeds above approximately 0.1 per unit, provided that the model stator inductance is underestimated. Experimental results support the theory.

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