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M. Vogelsberger, M. Riepler, S. Grubic, T Habetler, T. Wolbank:
"Integration of Transient and Fundamental Wave";
Vortrag: International Conference on Electrical Machines ICEM, Vilamoura, Portugal; 06.09.2008 - 09.09.2008; in: "XVIII International Conference on Electrical Machines", (2008), ISBN: 978-1-4244-1736-0; S. 1 - 6.

To realize a field oriented control of ac machines that is
able to work at zero speed the most commonly used methods are
either sensor based models or transient signal excitation methods.
In this paper a new evaluation algorithm based on phase current
derivation to extract the flux position information is presented.
This method is working without additional transient excitation of
the machine and requires only the fundamental wave excitation
using standard PWM or a slightly modified PWM. Only the
current response in the active states of the PWM is exploited, to
avoid parasitic influences during the zero switching state.
Measurement results are presented to validate the applicability of
the presented approach.