Method for determining the stator flux of an asynchronous machin

Details Method for determining the stator flux of an asynchronous machin Method for determining the stator flux of an asynchronous machin

1992-10-20

1994-12-06

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

318802, G01R 104

Patent

active

053714580

ABSTRACT:
The invention relates to a method for determining the stator flux of an asynchronous machine when a stator current (i.sub.2) and stator voltage (u.sub.s) of the asynchronous machine are measured and a short-circuit inductance (.sigma.L.sub.s), stator inductance (L.sub.s) and rotor time constant (.tau..sub.r) of the machine are assumed to be known, wherein the product of the stator current (i.sub.s) and a stator resistance estimate (R.sub.se) is determined, the obtained product is subtracted from the stator voltage (u.sub.s), and the obtained voltage difference is integrated with respect to time to obtain a first stator flux estimate (.psi..sub.se). In the invention, the method further comprises the steps of determining a second stator flux estimate (.psi..sub.se,id) on the basis of the stator voltage (u.sub.s), the stator current (i.sub.s), the short-circuit inductance (.sigma.L.sub.s), the stator inductance (L.sub.s), the rotor time constant (.tau..sub.r) and the stator resistance estimate (R.sub.se); determining a stator flux correction term (.DELTA..psi..sub.se) as a difference between the first stator flux estimate (.psi..sub.se) and the second stator flux estimate (.psi..sub.se,id), and summing the stator flux correction term (.DELTA..psi..sub.se) weighted by a constant coefficient (w) with said voltage difference.

REFERENCES:
patent: 4477787 (1984-05-01), Sweisig et al.
patent: 4678248 (1987-07-01), Depenbrock

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