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:
Aug. 29, 1989
Filed:
Feb. 16, 1988
Applicant:
Inventors:
Assignee:
Kabushiki Kaisha Meidensha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M / ;
U.S. Cl.
CPC ...
363 41 ; 363 37 ; 318802 ; 318811 ; 364161 ;
Abstract
An induction motor vectro control apparatus calculates a slip factor using a secondary time constant. A reference signal is added as noise to the excitation current command signal. The secondary time constant is brought closer to its actual value by modifying the secondary time constant in a direction zeroing the correlation between the motor speed feedback signal and the reference signal.