Method and device for correcting estimated speed of...

Details Method and device for correcting estimated speed of... Method and device for correcting estimated speed of...

2005-06-21

2005-06-21

Duda, Rina (Department: 2837)

Electricity: motive power systems

Induction motor systems

C318S801000, C318S805000, C318S799000, C702S147000

Reexamination Certificate

active

06909257

ABSTRACT:
A magnetic flux estimator7of a controller used for sensorless vector-controlling of an induction motor computes an estimated speed ωrestand an estimated phase θlestfrom input α-phase and β-phase voltage instructions Vα*, Vβ* and α-phase and β-phase currents isα, isβ. A speed corrector8receives these information items and determines a difference between a differential value output from a phase estimator and an additionally input slip angular speed; that is, a deviation ω′res. Further, a primary delay integral value is determined by subtracting a slip angular frequency ωsfrom the deviation, and the primary delay integral value is multiplied by a correction gain, to thereby produce a correction to be made on the estimated speed ωrest. Thus, a more accurate estimated speed ω″restis obtained.

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