Electricity: measuring and testing – Magnetic – Displacement
Reexamination Certificate
2007-09-13
2008-11-11
LeDynh, Bot (Department: 2862)
Electricity: measuring and testing
Magnetic
Displacement
C324S239000
Reexamination Certificate
active
07449880
ABSTRACT:
A method is suggested for determining the angular position of the rotor in a rotating electric machine, which machine has a stator winding set with at least three stator windings, and the stator winding set is powered by a converter device. Firstly, a first voltage (U1) is applied to the stator winding set via the converter device within a first definable time period (tx1), and a first current gradient(ⅆiⅆt|U1)is calculated therefor, and a second voltage (U2) is applied to the stator winding set via the converter device within the first definable time period (tx1), and a second current gradient(ⅆiⅆt|U2)is calculated therefor. A third voltage (U3) is then applied to the stator winding set via the converter device within a second definable time period (tx2), and a third current gradient(ⅆiⅆt|U3)is calculated therefor, and a fourth voltage (U4) is applied to the stator winding set via the converter device within the second definable time period (tx2), and a fourth current gradient(ⅆiⅆt|U4)is calculated therefor. A partial rotor position (γ) is calculated from the first, second, third and fourth current gradients(ⅆiⅆt|U1,ⅆiⅆt|U2,ⅆiⅆt|3,ⅆiⅆt|U4).The stator voltage (US) at the stator winding set and the stator current (IS) at the stator winding set are also determined continuously and a first stator flux signal (ψ1) is calculated from the stator voltage (US) and the stator current (IS), and a second stator flux signal (ψ2) is calculated from the stator current (IS) and a magnetisation flux (ψM) of the stator winding set. Moreover, the cosine angle function of the first stator flux signal (ψ1) and of the second stator flux signal (ψ2) is derived, whereinthe difference is derived from the cosine angle function of the first stator flux signal (ψ1) and the cosine angle function of the second stator flux signal (ψ2). If the difference lies outside an adjustable tolerance range, a correction phase angle (ψK) is added to the partial rotor position angle (γ).
REFERENCES:
patent: 6172498 (2001-01-01), Schmidt et al.
patent: 7026812 (2006-04-01), Honkura et al.
Senyu, T. et al., “Initial rotor position estimation of salient-pole brushless DC motors by artificial neural network.” Power Conversion Conference, Nagaoka 1997, Proceedings of the Nagaoka, Japan Aug. 3-6, 1997, New York, NY, USA, IEEE, US, Bd. 1, 3. Aug. 1997, XP010257297, ISBN: 0-7803-3823-5, pp. 145-150.
Holtz, Joachim, “Sensorless Control of Induction Motor Drives.” Proceedings of the IEEE, IEEE, New York, NY, US, Bd. 90, Nr. Aug. 8, 2002, XP011065049, ISSN: 0018-9219, pp. 1359-1394.
European Search Report issued on Feb. 1, 2007 in European Patent Application No. 06405391.1.
Beiser Dirk
Bohren Patrick
Conticelli Fabio
Harder Thorsten
ABB (Schweiz) AG
Buchan Ingersoll & Rooney PC
LeDynh Bot
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