The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 21, 2005
Filed:
Dec. 14, 2001
Masanobu Inazumi, Fukuoka, JP;
Masanobu Inazumi, Fukuoka, JP;
Kabushiki Kaisha Yaskawa Denki, Fukuoka, JP;
Abstract
A magnetic flux estimatorof a controller used for sensorless vector-controlling of an induction motor computes an estimated speed ωand an estimated phase θfrom input α-phase and β-phase voltage instructions V*, V* and α-phase and β-phase currents i, i. A speed correctorreceives 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'. Further, a primary delay integral value is determined by subtracting a slip angular frequency ωfrom 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 ω. Thus, a more accurate estimated speed ω″is obtained.