Data processing: measuring – calibrating – or testing – Measurement system – Orientation or position
Reexamination Certificate
2005-02-01
2005-02-01
Barlow, John (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system
Orientation or position
C318S254100
Reexamination Certificate
active
06850863
ABSTRACT:
The method of determining the stopped angular position of a rotor comprises the following steps:a) applying a sequence of successive voltage vectors to the terminals of the windings of the stator, said sequence including first and second voltage vectors adapted to modify the electrical characteristics of the windings and a third voltage vector adapted to cancel out the torque created by applying the first and second voltage vectors,b) determining a response signal from all of the windings to application of the first and second voltage vectors, andc) establishing the angular position of the rotor with an uncertainty of ±90° from the signals determined in the step b).
REFERENCES:
patent: 5001405 (1991-03-01), Cassat
patent: 5796235 (1998-08-01), Schrodl et al.
patent: 6172498 (2001-01-01), Schmidt et al.
patent: 6246193 (2001-06-01), Dister
patent: 0 827 267 (1998-03-01), None
patent: WO 90 12278 (1990-10-01), None
Alacoque Jean-Claude
Benchaib Abdelkrim
Poullain Serg
Thomas Jean-Luc
Alstom
Barlow John
Cherry Stephen J.
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